WO2026007635A1 - Procédé de contrôle du sable et dispositif de contrôle du sable pour tube crépiné endommagé - Google Patents

Procédé de contrôle du sable et dispositif de contrôle du sable pour tube crépiné endommagé

Info

Publication number
WO2026007635A1
WO2026007635A1 PCT/CN2025/100145 CN2025100145W WO2026007635A1 WO 2026007635 A1 WO2026007635 A1 WO 2026007635A1 CN 2025100145 W CN2025100145 W CN 2025100145W WO 2026007635 A1 WO2026007635 A1 WO 2026007635A1
Authority
WO
WIPO (PCT)
Prior art keywords
support body
sand
point metal
support
cylinder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/CN2025/100145
Other languages
English (en)
Chinese (zh)
Inventor
刘伟
查春青
张文耀
许朝辉
林子力
房超
范进朝
付加胜
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China National Petroleum Corp
CNPC Engineering Technology R&D Co Ltd
Original Assignee
China National Petroleum Corp
CNPC Engineering Technology R&D Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China National Petroleum Corp, CNPC Engineering Technology R&D Co Ltd filed Critical China National Petroleum Corp
Publication of WO2026007635A1 publication Critical patent/WO2026007635A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/02—Subsoil filtering
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/02—Subsoil filtering
    • E21B43/04—Gravelling of wells

Definitions

  • This invention relates to the field of sand control technology, and more specifically to a sand control method and device for damaged screen tubes.
  • Sand production in oil wells is a common problem in oil reservoir development, especially in the development of loose sandstone reservoirs.
  • Sand production in oil and gas wells greatly affects the exploitation operations of loose sandstone reservoirs. It can cause excessive wear and tear on downhole and surface equipment, leading to pump sticking, sand burial accidents, casing damage, wellbore collapse, and well abandonment.
  • screen pipe sand control is a relatively common sand control technique. Its mechanism involves forming a sand-blocking barrier using relevant equipment to prevent larger sand particles from entering the screen pipe and wellbore, thus achieving sand control.
  • the screen pipe operates continuously in sand-containing crude oil, enduring the erosion and wear of solid sand particles in the crude oil. Once the screen pipe malfunctions, it becomes extremely difficult to maintain efficient oil well production, and may even necessitate the shutdown of the well in later stages.
  • this invention provides a sand control method and device for damaged screens.
  • This invention provides a sand control method, comprising the following steps:
  • Step S1 Insert the support into the damaged screen tube and record the insertion depth of the support until the support is inserted above the damaged position of the screen tube.
  • Step S2 Lower the support cylinder containing the low melting point metal and the heating element until the support cylinder is located at a preset position above the support body;
  • Step S3 Start the heating element to heat the low melting point metal. After the low melting point metal melts, it falls onto the support and flows in the horizontal direction. The liquid low melting point metal passes through the screen tube and enters the formation, filling the gaps between the gravel layer and the sand layer. The solidified low melting point metal forms a metal sealing layer.
  • step S1 the support body is located below the support cylinder and connected to the support cylinder, and the support body and the support cylinder are lowered together into the damaged screen tube.
  • the support when the support is connected to the bearing cylinder, the support can detach from the bearing cylinder and sit on the inner wall of the damaged screen tube when the heating element is heated.
  • step S1 the support body is separated from the bearing cylinder, the support body is lowered through the first cable, the support body is lowered into the space above the damaged position of the screen tube and then seated, and the first cable is removed.
  • step S2 when the support body is separated from the bearing cylinder, in step S2, the bearing cylinder is lowered until it is located 20-50cm above the support body.
  • the present invention also provides a sand-prevention device, the sand-prevention device comprising:
  • the support structure is designed to support the damaged area of the screen tube.
  • the support cylinder can extend into the screen tube and is positioned above the support body at intervals.
  • the bottom of the support cylinder is provided with a low melting point metal block.
  • a heating element is disposed inside the support cylinder for heating the low-melting-point metal block. After being heated by the heating element, the low-melting-point metal block melts and flows out of the bottom of the support cylinder.
  • the low-melting-point metal block is arranged on the bottom outer periphery of the support cylinder by casting.
  • the heating element is inserted into the bearing cylinder, and the bottom end of the heating element extends downward out of the bearing cylinder.
  • the low melting point metal block is arranged on the outer periphery of the portion of the heating element that extends out of the bearing cylinder by casting.
  • the bottom of the support cylinder is provided with a storage space, in which the low-melting-point metal block is poured or stored.
  • the heating element is an electric heater or a chemical combustion agent.
  • a second cable is connected to the top of the support cylinder, the second cable including a pull rope and a power cable, the power cable being electrically connected to the heating element.
  • the sand-proof device further includes an initiator disposed inside the bearing cylinder, the initiator being located above the heating element and electrically connected to the heating element, and the cable being electrically connected to the initiator.
  • the top of the starter is also provided with a seal, which is used to isolate the starter from the external environment.
  • the bearing cylinder is separated from the support body, and the support body can be lowered to the top of the damaged position of the screen tube and then set.
  • the distance between the bottom end of the bearing cylinder and the top end of the support body is 20-50cm.
  • the support body and the bearing cylinder are connected by a traction rope, which can be heated and melted by the heating element. After the support body loses the traction of the traction rope, it can be seated above the damaged position of the screen tube.
  • the outer periphery of the seated support is formed with a sloping surface so that the support presents an arch shape.
  • the support includes:
  • a support cylinder is connected to the low-melting-point metal block
  • An elastic element is disposed inside the support cylinder, and the top of the elastic element is connected to the support cylinder;
  • a sliding member is disposed below the elastic member and slides in cooperation with the support cylinder.
  • the top of the sliding member is connected to the traction rope.
  • the elastic member applies a force to the sliding member away from the low melting point metal block.
  • the support member is hinged at one end to the support cylinder and at the other end to the sliding member.
  • the support member can expand outward as the sliding member moves away from the low melting point metal block.
  • the sand control method provided by this invention involves supporting the screen tube above the damaged location with a support body, lowering a bearing cylinder above the support body, and heating a low-melting-point metal with a heating element.
  • the melted low-melting-point metal falls onto the support body and flows horizontally.
  • the liquid low-melting-point metal passes through the screen tube and enters the formation, filling the gaps between the gravel and sand layers.
  • Figure 1 is a schematic diagram of the sand control device according to the first embodiment of the present invention.
  • Figure 2 is a schematic diagram of the structure of the sand-prevention device described in the first embodiment of the present invention when it is lowered into the screen tube;
  • Figure 3 is a schematic diagram of the structure of the sand-proof device after use according to the first embodiment of the present invention
  • Figure 4 is a structural schematic diagram of the sand-proof device according to the second embodiment of the present invention.
  • Figure 5 is a schematic diagram of the structure of the sand-prevention device according to the second embodiment of the present invention when it is lowered into the screen tube;
  • Figure 6 is a schematic diagram of the structure of the sand-proof device according to the second embodiment of the present invention when the support body is deployed after it is lowered into the screen tube;
  • Figure 7 is a schematic diagram of the structure of the sand-proof device after use according to the second embodiment of the present invention.
  • Sand control using screen pipe 11 is a common method of sand control.
  • Screen pipe 11 is lowered into wellbore 1 to form a barrier, preventing larger sand particles from entering screen pipe 11 and wellbore 1, thereby achieving the purpose of sand control.
  • the outer periphery of screen pipe 11 is successively composed of gravel layer 12, sand layer 13 and oil layer 14.
  • the sand control method provided by the embodiments of the present invention includes the following steps:
  • Step S1 When severe sand is detected on the surface, it can be determined that the downhole screen pipe 11 is damaged and ineffective. A support body 2 is lowered into the damaged screen pipe 11, and the lowering depth of the support body 2 is recorded until it reaches above the damaged location of the screen pipe 11.
  • Step S2 Lower the support cylinder 3, which carries the low melting point metal and the heating element 4, until the support cylinder 3 is located at a preset position above the support body 2.
  • the support body 2 and the carrier cylinder 3 can be lowered into the screen tube 11 sequentially; or, the support body 2 can be positioned below the carrier cylinder 3, and both the support body 2 and the carrier cylinder 3 can be lowered into the screen tube 11 together. Therefore, the lowering method of the support body 2 and the carrier cylinder 3 is not restricted and can be designed according to actual needs, but it must be ensured that the carrier cylinder 3 is located at a preset position above the support body 2.
  • Step S3 The heating element 4 is activated to heat the low melting point metal. After the low melting point metal melts, it falls onto the support 2 and flows horizontally. The liquid low melting point metal passes through the screen tube 11 and enters the formation, filling the gaps between the gravel layer 12 and the sand layer 13. The solidified low melting point metal forms a metal sealing layer 8.
  • the liquid low-melting-point metal moves both horizontally and vertically, but the movement is relatively small and does not affect the performance of the screen tube 11.
  • the liquid low-melting-point metal first enters the gravel layer 12 through the holes in the screen tube 11, then enters the sand layer 13, and some of the liquid low-melting-point metal flows into the oil layer 14.
  • the solidified low-melting-point metal forms a metal sealing layer 8.
  • the sand control method provided by this invention uses a support body 2 to support the damaged position of the screen pipe 11.
  • a bearing cylinder 3 is lowered above the support body 2.
  • a low-melting-point metal is heated by a heating element 4. After the low-melting-point metal melts, it falls onto the support body 2 and flows horizontally.
  • the liquid low-melting-point metal passes through the screen pipe 11 and enters the formation, filling the gaps between the gravel layer 12 and the sand layer 13. Then, taking advantage of the good sealing performance, corrosion resistance and phase transformation stability of the low-melting-point metal, a stable metal sealing layer 8 is formed, which greatly improves the sand control capability and can solidify the gravel layer 12 and the sand layer 13, preventing the flow of sand and gravel.
  • the sand control method provided in this application utilizes the fluidity and high density of liquid low-melting-point metal. Without dismantling the existing screen pipe 11, it flows under its own weight into the gaps between the gravel layer 12 and the sand layer 13, allowing the sealing liquid low-melting-point metal to flow into the gravel layer 12 outside the screen pipe 11, thus completing the metal sealing of the annulus between the screen pipe 11 and the external gravel layer 12. Furthermore, it eliminates the need for drilling rigs and large surface pump systems; a cable car system is sufficient for tool entry and repair work on the screen pipe 11. The resulting metal sand control layer 13 exhibits excellent sealing performance. This method is very simple to implement, has low operating costs, and a short construction period, providing a permanent and reliable sand control for damaged screen pipes 11 by forming a metal barrier.
  • step S1 as shown in Figures 4 to 7, the support body 2 is located below and connected to the support cylinder 3, and the support body 2 and the support cylinder 3 are lowered together into the damaged screen tube 11.
  • the support body 2 is connected to the bearing cylinder 3 to fix the distance between the support body 2 and the bearing cylinder 3. Then, the support body 2 and the bearing cylinder 3 are lowered into the screen tube 11 together, which makes it easier to control the distance between the support body 2 and the bearing cylinder 3.
  • the support 2 when the support 2 is connected to the carrier cylinder 3, the support 2 can detach from the carrier cylinder 3 and sit on the inner wall of the damaged screen tube 11 when the heating element 4 is heated.
  • the heating element 4 begins to heat.
  • the support 2 will detach from the bearing cylinder 3 as the heating element 4 heats up, and set on the inner wall of the screen tube 11.
  • the low-melting-point metal on the bearing cylinder 3 melts and falls onto the support, flowing horizontally.
  • the liquid low-melting-point metal passes through the screen tube 11 and enters the formation, filling the gaps between the gravel layer 12 and the sand layer 13.
  • the solidified low-melting-point metal forms a metal sealing layer 8.
  • the support body 2 is separated from the bearing cylinder 3.
  • the support body 2 is lowered via a first cable, and after it is lowered above the damaged position of the screen tube 11, it sets and is then removed.
  • the support body 2 is set and released by ground ignition or pressure injection from the oil pipe.
  • the specific setting method of the support body 2 is not limited and can be selected according to actual needs.
  • the setting of the support body 2 is a conventional technique in the art, and its structure and working principle are not described in detail here. This method of lowering the support body 2 is convenient and increases work efficiency.
  • the support 2 has a disc structure, and the size of the support 2 matches the cross-sectional size of the screen tube 11 so that the support 2 can be lowered into the screen tube 11.
  • the distance between the outer wall of the support 2 and the inner wall of the screen tube 11 is relatively small so that the support 2 can be seated on the inner wall of the screen tube 11 to ensure the positioning effect of the support 2.
  • the carrier cylinder 3 carries the low-melting-point metal and the heating element 4 is described below.
  • the carrier cylinder 3 is lowered, it is lowered until the carrier cylinder 3 is located 20-50 cm above the support body 2, so that the molten low-melting-point metal can fall onto the support body 2.
  • the present invention also provides a sand-prevention device, which includes a support body 2, a bearing cylinder 3, and a heating element 4.
  • the support body 2 can support the damaged area of the screen tube 11.
  • the bearing cylinder 3 can extend into the screen tube 11 and is positioned above the support body 2 at a distance.
  • the bottom of the bearing cylinder 3 is provided with a low melting point metal block 31.
  • the support body 2 and the bearing cylinder 3 can be designed as separate units, in which case the support body 2 and the bearing cylinder 3 are lowered into the screen tube 11 separately.
  • the support body 2 and the bearing cylinder 3 can be connected, in which case the support body 2 and the bearing cylinder 3 are lowered into the screen tube 11 together.
  • Heating element 4 is installed inside the support cylinder 3 to heat the low-melting-point metal block 31. After being heated by heating element 4, the low-melting-point metal block 31 melts and flows out of the bottom of the support cylinder 3. In use, the low-melting-point metal is heated by heating element 4. When the heating temperature exceeds the melting point of the low-melting-point metal block 31, the low-melting-point metal block 31 begins to melt. After melting, the low-melting-point metal falls onto the support body 2 and flows horizontally. The liquid low-melting-point metal passes through the screen pipe 11 and enters the formation, filling the gaps between the gravel layer 12 and the sand layer 13.
  • the sand control device After all the low-melting-point metal has melted, the sand control device is brought to the surface via the surface cable car system. After the temperature of the molten low-melting-point metal downhole drops below its melting point, the low-melting-point metal begins to solidify. The solidified low-melting-point metal forms a metal sealing layer 8, which separates the sand layer 13 and plays a role in sand control.
  • the sand control device utilizes the advantages of low-melting-point metals, such as excellent sealing performance, corrosion resistance, and phase transformation stability, to form a stable metal sealing layer 8.
  • the sand control capability is greatly improved. It can not only seal the damaged location of the screen pipe 11, but also solidify the sand and gravel, preventing its flow. This achieves a seal within the sand control screen pipe 11 and in the surrounding annulus, maintaining the ability to extract oil and gas resources above the sealed section.
  • the sand control device has a simple structure, a short overall operation cycle, simple construction, low cost, and a high sand control success rate.
  • the sand control device is used to implement the sand control method described above.
  • the low-melting-point metal block 31 is arranged on the bottom outer periphery of the support cylinder 3 by casting. In this design, the low-melting-point metal block 31 is formed on the bottom outer periphery of the support cylinder 3, which makes it easy for the molten low-melting-point metal block 31 to directly detach from the support cylinder 3 and fall onto the support body 2.
  • the heating element 4 is inserted into the bearing cylinder 3, and the bottom end of the heating element 4 extends downward out of the bearing cylinder 3.
  • the low melting point metal block 31 is arranged on the outer periphery of the part of the heating element 4 that extends out of the bearing cylinder 3 by casting.
  • the heating element 4 adopts a columnar structure and is coaxially arranged with the bearing cylinder 3.
  • a low melting point metal block 31 is cast on the outer periphery of the bottom end of the heating element 4, making the low melting point metal block 31 cylindrical.
  • the outer diameter of the low melting point metal block 31 is consistent with the outer diameter of the bearing cylinder 3, reducing space occupation and making the overall structure of the bearing cylinder 3 more compact.
  • the heating element 4 acts directly on the low melting point metal block 31, ensuring the heating effect of the low melting point metal block 31 and avoiding the phenomenon that the low melting point metal block 31 cannot melt.
  • This application utilizes the heat provided by the heating element 4 to transform the low-melting-point metal block 31 from a solid to a liquid state.
  • the low-melting-point metal block 31 exhibits good fluidity in its liquid state. Under its own gravity, the liquid metal flows through the screen tube 11 and enters the gaps in the sand and gravel. The molten metal solidifies, sealing the damaged areas of the screen tube 11 and solidifying the sand and gravel, thereby achieving a seal within and around the screen tube 11. Without damaging the existing screen tube 11, the liquid low-melting-point metal for sealing can be injected into the gravel-filled layer outside the screen tube 11.
  • the resulting metal sand-proof layer 13 has excellent sealing performance and corrosion resistance, significantly reducing the possibility of sand-proof failure while maintaining the oil and gas production capacity above the sealed section.
  • the bottom of the support cylinder 3 is provided with a storage space, in which a low-melting-point metal block 31 is poured or stored.
  • the bottom of the bearing cylinder 3 is provided with an annular storage space, and the low melting point metal block 31 is formed in the storage space by casting. At this time, the low melting point metal block 31 is in the shape of an annulus.
  • This design also facilitates the formation of the low-melting-point metal block 31, and the storage space can protect the low-melting-point metal block 31.
  • the bottom of the storage space is open, which makes it easy for the molten low-melting-point metal to flow out from the bottom of the storage space.
  • a support plate may be provided at the bottom of the support cylinder 3, and a support space is formed at the top of the support plate.
  • the low melting point metal block 31 is placed on the top of the support plate.
  • the shape of the low melting point metal block 31 is not limited and can be designed according to actual needs.
  • the bottom of the bearing cylinder 3 should have an opening to connect the storage space and the external environment so that the molten low melting point metal block 31 can flow out through the opening.
  • the heating element 4 is an electric heater that can continuously heat the low-melting-point metal block 31 to ensure that the low-melting-point metal block 31 remains in a liquid state so as to form the metal sealing layer 8.
  • the heating element 4 is a chemical propellant.
  • This chemical propellant is composed of multiple propellant blocks and a binder, ignited by the initiator 6.
  • the ignited chemical propellant reacts sequentially from top to bottom, with the binder acting to bind and maintain the continuous reaction.
  • the low-melting-point metal block 31 melts from the top, eventually spreading across the open space formed by the support 2 and the ground layer to form a metal sealing layer 8.
  • a second cable 5 is connected to the top of the support cylinder 3.
  • the second cable 5 includes a pull rope and an electrical cable, and the electrical cable is electrically connected to the heating element 4.
  • the pull rope is used to suspend the support cylinder 3, enabling it to be lowered into the screen tube 11 and maintaining its position within the screen tube 11.
  • the electrical cable is used for signal and power transmission, transmitting control signals and power from the ground to the heating element 4, specifically to the starter 6 described below, facilitating control of the heating element 4 to control the heating of the low-melting-point metal block 31.
  • the sand control device also includes an initiator 6 disposed within the support cylinder 3.
  • the initiator 6 is located above and electrically connected to the heating element 4, and a cable is electrically connected to the initiator 6.
  • the cable is connected to a ground-based control system, and the initiator 6 can generate a certain amount of starting energy to achieve remote ignition via ground control.
  • the cable is used for signal and power transmission, transmitting control signals and power from the ground to the starter 6.
  • the starter 6 then controls the activation of the heating element 4, achieving heating control of low-melting-point metals.
  • the starter 6 is a standard structure used to start and stop the components; its working principle is not described in detail here.
  • the starter 6 when the heating element 4 is a chemical propellant, the starter 6 generates a starting spark to ignite the propellant inside the heating element 4, thereby achieving combustion and heat release.
  • the chemical propellant can release a huge amount of heat, which is sufficient to quickly melt the low-melting-point metal block 31.
  • the starter 6 when the heating element 4 is an electric heater, the starter 6 will activate the resistance heating, which can continuously heat the molten low-melting-point metal block 31, maintain the fluidity of the liquid metal, and allow it to fully enter the formation and fill the gaps in the sand and gravel.
  • the bearing cylinder 3 of this application is a hollow stepped cylinder made of high-temperature resistant metal material, which has good thermal conductivity, high temperature resistance, and reliability for downhole operations.
  • the support cylinder 3 has a first part at its top and a second part at its bottom, with the diameter of the first part being smaller than that of the second part.
  • the first part has a first mounting hole
  • the second part has a second mounting hole, the diameter of which is larger than that of the first mounting hole.
  • the starter 6 has a columnar structure and is coaxially mounted within the first mounting hole.
  • the heating element 4 also has a columnar structure and is mounted within the second mounting hole. This design makes the support cylinder 3 more compact, reducing its volume and facilitating its insertion into the screen tube 11.
  • the top of the starter 6 is also provided with a seal 7, which is used to isolate the starter 6 from the external environment.
  • the starter 6 is coaxially disposed in the first mounting hole, and the top of the first mounting hole is open to allow the cable to pass through the bearing cylinder 3.
  • the seal 7 may be a sealing block disposed at the top of the first mounting hole.
  • the sealing block may be made of rubber, and the middle of the sealing block is provided with a through hole for the cable to pass through, so as to realize the cable passing through and the top sealing of the bearing cylinder 3.
  • the sealing block is screwed to the top of the first mounting hole.
  • the support cylinder 3 is separated from the support body 2.
  • the support body 2 can be lowered to the top of the damaged position of the screen tube 11 and then set.
  • the distance between the bottom end of the support cylinder 3 and the top end of the support body 2 is 20-50cm so that the molten low-melting-point metal can fall onto the support body 2.
  • the support 2 has a disc-like structure, and its dimensions match the cross-sectional dimensions of the screen tube 11, allowing the support 2 to be lowered into the screen tube 11.
  • the distance between the outer wall of the support 2 and the inner wall of the screen tube 11 is relatively small, facilitating the support 2 to be seated on the inner wall of the screen tube 11 and ensuring its positioning.
  • the support 2 is designed to be anchored to the inner wall of the screen tube 11.
  • the method of seating the support 2 is not limited and can be selected according to actual needs. Sealing the support 2 is a conventional technique in the art, and its structure and working principle are not described in detail here. This method of lowering the support 2 is convenient and increases work efficiency.
  • the support body 2 and the bearing cylinder 3 are connected by a traction rope 9.
  • the traction rope 9 can be heated and melted by the heating element 4, and the support body 2 can be seated above the damaged position of the screen tube 11 after losing the traction of the traction rope 9. It is understood that the traction rope 9 can be connected to the bearing cylinder 3 or to the heating element 4 on the bearing cylinder 3, and can be designed according to actual needs.
  • This design which uses both the support body 2 and the bearing cylinder 3 to be lowered into the screen tube 11, increases operational convenience. Furthermore, the support body 2 and the bearing cylinder 3 are connected by a traction rope 9. Before the heating element 4 heats and melts the low-melting-point metal block 31, the heat melts the traction rope 9, allowing the support body 2 to be seated above the damaged area of the screen tube 11. This eliminates the need to separately release the support body 2 to support it against the inner wall of the screen tube 11, further enhancing operational convenience.
  • the traction rope 9 is connected to the support cylinder 3 at a position close to the top of the heating element 4, so that the heating element 4 can preferentially melt the traction rope 9 when heating, ensuring that the support body 2 can be seated on the inner wall of the screen tube 11 before the low melting point metal block 31 melts.
  • the outer periphery of the set support 2 forms a sloping surface, giving the support 2 an arched shape.
  • This design allows the arched support 2 to guide the flow of molten low-melting-point metal, facilitating its outward expansion to form a metal sealing layer 8.
  • the arched support 2 enhances the lateral seepage tendency of the liquid metal. After cooling and solidification, due to the unique arched structure, the volume of excess low-melting-point metal within the wellbore is relatively small, significantly reducing the amount of metal used for sand control and saving material costs.
  • the support body 2 includes a support cylinder 21, an elastic element 22, a sliding element 23, and a support element 24.
  • the support cylinder 21 is connected to the low-melting-point metal block 31.
  • the connection method can be snap-fit or welding to ensure a strong connection. After the low-melting-point metal block 31 melts, the support cylinder 21 can be separated from the bearing cylinder 3.
  • An elastic element 22 is disposed inside the support cylinder 21, and the top of the elastic element 22 is connected to the support cylinder 21.
  • the elastic element 22 may include multiple springs.
  • the connection method between the elastic element 22 and the top of the support cylinder 21 is not limited. For example, it can be welded or a hook and loop can be provided on the top of the support cylinder 21. The design can be customized according to actual needs.
  • the sliding member 23 is located below the elastic member 22 and slides with the support cylinder 21 so that the sliding member 23 can move vertically relative to the support cylinder 21.
  • the top of the sliding member 23 is connected to the traction rope 9.
  • the elastic member 22 applies a force to the sliding member 23 away from the low melting point metal block 31, that is, the elastic member 22 applies a vertically downward force to the sliding member 23 so that the sliding member 23 can move downward after losing the restraining force of the traction rope 9.
  • One end of the support member 24 is hinged to the support cylinder 21, and the other end of the support member 24 is hinged to the slider 23.
  • the support member 24 can expand outward as the slider 23 moves away from the low melting point metal block 31.
  • the sand control device is lowered via a cable car system on the ground, supported by a support body 2 and a bearing cylinder 3.
  • the depth of descent is recorded during the lowering process.
  • the support body 2 is positioned below the bearing cylinder 3.
  • the support cylinder 21 is connected to a low-melting-point metal block 31.
  • the top of the sliding member 23 is connected to the top of the bearing cylinder 3 via a traction rope 9, and an elastic element 22 provides a downward force to the sliding member 23. At this time, the traction rope 9 is taut and pulls the sliding member 23.
  • the heating element 4 When the heating element 4 is activated, the temperature rises, and the traction rope 9 melts at high temperature. At this time, the low-melting-point metal block 31 is not melted.
  • the support cylinder 21 is connected to the low-melting-point metal block 31, and the support cylinder 21 still supports the elastic element 22. At this time, since the sliding element 23 loses the traction of the traction rope 9, the elastic potential energy of the elastic element 22 is released, which will push the sliding element 23 to move downward relative to the support cylinder 21.
  • the support element 24 expands outward along the direction away from the low-melting-point metal block 31 to support the inner wall of the screen tube 11, completing the setting and forming an arched sealing structure.
  • the low-melting-point metal block 31 melts from the top and eventually spreads in the open space formed by the support element 24 and the ground layer, forming a metal sealing layer 8.
  • the support 2 is easy to lower in this design, and can be seated and sealed simply by heating with the heating element 4.
  • the structure is ingenious and increases work efficiency.
  • the sliding member 23 is a sliding cylinder, the top end of which is connected to the bottom end of the traction rope 9, and the bottom end of the elastic member 22 acts on the top end of the sliding cylinder to provide a downward force to the sliding cylinder.
  • a limiting ring is provided on the outer periphery of the sliding cylinder, and the limiting ring is supported on the bottom of the support cylinder 21 to limit the position of the sliding cylinder.
  • a slip ring is provided on the outer periphery of the sliding cylinder, and one end of the support member 24 is hinged to the slip ring.
  • the sliding member 23 in this design has a simple structure and can ensure that it moves in the vertical direction.
  • the position of the sliding cylinder can be restricted by the limiting ring.
  • the convenience of connecting it with the support member 24 can be increased by setting the slip ring.
  • the support member 24 includes a first support body and a second support body.
  • One end of the first support body is hinged to the bottom end of the support cylinder 21, and the other end of the first support body is hinged to the end of the second support body.
  • the other end of the second support body is hinged to a slip ring.
  • the first support body includes a plurality of first support body bodies spaced apart along the circumferential direction of the support cylinder 21, and the second support body includes a plurality of second support body bodies spaced apart along the circumferential direction of the support cylinder 21.
  • the plurality of first support body bodies and the plurality of second support body bodies correspond one-to-one, and the corresponding first support body bodies and second support body bodies are hinged together.
  • the angle between the first support body body and the second support body body is an acute angle.
  • the slide cylinder loses the traction force of the traction rope 9, it moves downward under the action of the elastic member 22.
  • the second support body body will push the first support body body to expand outward, so that the connection between the first support body body and the second support body body expands outward to support the inner wall of the screen tube 11 to complete the setting.
  • there is a gap between the first support body and the second support body and some liquid cryogenic metal flows away through the gap.
  • the two adjacent first support bodies are connected by a high-temperature resistant elastic material to reduce the loss of liquid cryogenic metal and save material costs.
  • Low-melting-point metals have unique properties. To better adapt to different temperature and pressure environments downhole, multiple metal series are designed to suit different well temperatures, ensuring that low-melting-point metals have good density, corrosion resistance, and phase transformation stability.
  • the sand control device does not require any large ground equipment. After the sand control operation is completed, it can be lifted up via a ground cable car system. Only the chemical fuel and low-melting-point metal need to be replenished for repeated use. That is, except for the low-melting-point metal block 31 and the support body 2, the other tools can be recycled and reused, effectively reducing construction costs. Moreover, the sand control device can seal the damaged section of the screen pipe 11, solidify the sand and gravel outside the screen pipe 11, establish a long-term and effective sand control barrier, improve sand control efficiency, and reduce operating costs.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

Abstract

La présente invention se rapporte au domaine technique du contrôle du sable. L'invention concerne un procédé de contrôle du sable et un dispositif de contrôle du sable pour un tube crépiné endommagé. Le procédé de contrôle du sable comprend les étapes suivantes : abaisser un corps de support dans un tube crépiné endommagé ; abaisser un cylindre porteur jusqu'à ce que le cylindre porteur soit situé à une position prédéfinie au-dessus du corps de support ; démarrer un élément chauffant pour chauffer un métal à bas point de fusion, le métal à bas point de fusion tombant sur le corps de support après fusion et s'écoulant dans la direction horizontale, le métal à bas point de fusion liquide passant à travers le tube crépiné dans la formation pour remplir des espaces dans la couche de gravier et la couche de sable, et le métal à bas point de fusion solidifié formant une couche d'étanchéité métallique ; et avant la solidification du métal à bas point de fusion, lever les outils autres que le corps de support vers le haut au moyen d'un câble. Le procédé de contrôle du sable selon la présente invention utilise un métal à bas point de fusion ayant les avantages d'une bonne performance d'étanchéité, d'une résistance à la corrosion et d'une stabilité au changement de phase pour former une couche d'étanchéité métallique stable, de façon à consolider la couche de gravier et la couche de sable et à empêcher l'écoulement de sable et de gravier, ce qui permet d'obtenir une étanchéité à la fois à l'intérieur du tube crépiné et dans l'espace annulaire à l'extérieur du tube crépiné, et de maintenir la capacité à extraire des ressources d'hydrocarbure et de gaz au-dessus de la section scellée.
PCT/CN2025/100145 2024-07-01 2025-06-10 Procédé de contrôle du sable et dispositif de contrôle du sable pour tube crépiné endommagé Pending WO2026007635A1 (fr)

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CN202410872221.1 2024-07-01
CN202410872221.1A CN121273284A (zh) 2024-07-01 2024-07-01 已损坏筛管的防砂方法及防砂装置

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WO2026007635A1 true WO2026007635A1 (fr) 2026-01-08

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150345250A1 (en) * 2013-12-19 2015-12-03 Halliburton Energy Services, Inc. Intervention tool for delivering self-assembling repair fluid
US20210355792A1 (en) * 2020-05-12 2021-11-18 Aarbakke Innovation As Retrofit fluid and gas permeable barrier for wellbore use
WO2022008355A1 (fr) * 2020-07-07 2022-01-13 Interwell P&A As Charge de réaction de thermite, procédé de formation d'une barrière de puits de roche à roche à trois phases, et barrière de puits formée à partir de cette dernière
CN116517499A (zh) * 2023-04-28 2023-08-01 北京工业大学 一种井下水泥环金属修复方法
CN117307088A (zh) * 2023-08-31 2023-12-29 北京工业大学 一种井下感应加热金属熔融封堵工具及方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150345250A1 (en) * 2013-12-19 2015-12-03 Halliburton Energy Services, Inc. Intervention tool for delivering self-assembling repair fluid
US20210355792A1 (en) * 2020-05-12 2021-11-18 Aarbakke Innovation As Retrofit fluid and gas permeable barrier for wellbore use
WO2022008355A1 (fr) * 2020-07-07 2022-01-13 Interwell P&A As Charge de réaction de thermite, procédé de formation d'une barrière de puits de roche à roche à trois phases, et barrière de puits formée à partir de cette dernière
CN116517499A (zh) * 2023-04-28 2023-08-01 北京工业大学 一种井下水泥环金属修复方法
CN117307088A (zh) * 2023-08-31 2023-12-29 北京工业大学 一种井下感应加热金属熔融封堵工具及方法

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