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
  • E21B28/00—Vibration generating arrangements for boreholes or wells, e.g. for stimulating production
• • 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
  • E21B37/00—Methods or apparatus for cleaning boreholes or wells
  • E21B37/08—Methods or apparatus for cleaning boreholes or wells cleaning in situ of down-hole filters, screens, e.g. casing perforations, or gravel packs
• • 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
  • E21B43/003—Vibrating earth formations

Definitions

• the invention relates to a method and a device by means of which the permeability of bottom layers near the bore and of filter bodies and filter layers introduced into the bore in wells and other production bores can be intensified.
• German patent DE 195 37 689 C2 describes a method for regenerating a well, in which a cylindrical body is lowered between two wire disks as a centering into the well, and by opening a valve in this body gas under high pressure is accelerated against the well wall. This amount of gas pulsates as a pressure wave against the well wall, whereby the opening times of the valve, the escaping gas amount and the gas pressure can be set in the well before the regeneration work.
• the disadvantage of this method is that during work in the well, no simultaneous and immediate adaptation of the gas pressure, the amount of gas and the opening times of the valve to the hydraulic properties of the well and its environment in the ground, which change due to the processing after each pulse, can take place, and that the valve is not opened by a signal at a precisely defined point in time.
• the specified pressure of 10 to 25 bar also does not guarantee a high penetration depth into the bottom layers to be regenerated or into the filter body and filter layers.
• the principle of action to achieve a regeneration effect in this method consists in pulsing the bore section with a gaseous or liquid pressure medium and the resulting compression of the well water and / or the pressure medium through the filter slots into the filter gravel layers, i.e., there is only a volume displacement by the Filter slots.
• Fig. 1 shows schematically a longitudinal section through a production bore with a device according to the invention arranged therein;
• FIG. 2 shows details of the structure of a device used for carrying out the method according to the invention.
• FIG. 3 shows, in a view similar to FIG. 1, a production bore with a modified device according to the invention arranged therein
• a hydraulic energy pulse E is generated in the delivery area F of the delivery bore 11 under parameters that can be precisely controlled and controlled by means of measurement technology by means of a liquid volume that is usually loaded with very high kinetic energy, which is generated by an underground pump 8 in the production bore 11 continuously generated dynamic flow is even more effective.
• the uninterrupted pumping is made possible in that, in the method according to the invention, no rising gas bubbles are generated by using the smallest amounts of liquid.
• the pulse generator 1 is moved up and down in a defined manner by means of a hose winch 5 in the conveying area F during the regeneration in the conveying pipe 7.
• the control signal for opening the valve of the pulse generator 1 is passed by the control unit 9 as an electrical signal via a control cable 4 to the pulse generator 1.
• the electromagnet 14 is briefly energized by the control signal and the valve plate 16 opens the working chamber 12, and the amount of liquid that has previously been accumulated and provided with kinetic energy exits through the outlet openings 13 into the surrounding liquid to be delivered within 1 to 1.5 milliseconds.
• the lower valve plate 17 Due to the energization of the electromagnet 14, the lower valve plate 17 is simultaneously against the pressure of a liquid in the valve closing chamber 15 pressed down. Immediately after expansion of the volume in the working chamber 12, the pressure prevailing in the valve closing chamber 15 suddenly pushes the lower valve plate 17 back in the opposite direction, and the valve 13 is thus closed again after approximately 2 to 2.5 milliseconds.
• the volume of liquid in the valve closing chamber 15 can be changed both in its quantity and in its pressure via a closing valve 18 which can be actuated by the control unit 9.
• the volume of the working chamber 12 can also be changed from the control unit 9 under operating conditions.
• the device can be adapted to all types of conveying bores 11 and their diameters in their physical parameters and thus in the efficiency of the kinetic energy pulse E generated.
• a sensor 10 is arranged on the pulse generator 1, which continuously detects the energy and time profile of the energy pulses E and sends it via a measuring line 3 to the surface control unit 9.
• the operator has the option of constantly triggering the energy pulses E, the working pressure of the liquid present at the pulse generator 1, based on the course of the pulse effect detected by the sensor 10, the change in the dynamic liquid level in the delivery bore 11 and the discharge of dissolved colmatants that can be registered at the pump outlet and to control the delivery rate of the underground pump 8.
• the method according to the invention can be precisely controlled and is thus able to continuously and precisely adapt itself during the regeneration of a production bore 11 to the conditions in the hydraulic system of the production bore 11 that change during the processing without interrupting the regeneration process.
• the method according to the invention can be adapted to any known lining material of the production bore 11.
• the filter material very brittle such as B. in stoneware or aged PVC
• the hydraulic energy impulses may only have a low energy content, so that the brittle materials are neither damaged nor destroyed in this case.
• the filter layers of such a very brittle filter material are also particularly strongly compressed (e.g. due to a long operating time without regeneration or due to extreme iron contents in the pumped medium), the low energy content of the impulses results in a long processing time or the permeability of the Filter bodies, filter layers and bottom layers close to the bore are not intensified to the desired extent with a reasonable machining time.
• the well to be regenerated is first processed in the manner described above. Since the filter tube W of the well to be regenerated, which is shown schematically in section in FIG. 3 with broken lines, consists of very brittle material, the energy for the hydraulic energy pulses is chosen to be very low in order to avoid damage to the filter tube W in any case. The processing time would be considerably extended due to the low energy input. In addition, the filter layers are particularly heavily cumulated, which can occur if the well is operating for too long without regeneration or if the groundwater has extremely high iron contents. It is possible that the processing takes a disproportionately long time with the low energy input Colmatants with a reasonable processing time cannot be completely removed from the filter layers.
• the method described above is therefore terminated or interrupted after the inner surfaces have been cleaned and the through openings in the filter tube W have been exposed.
• the pulse generator 1 and the underground pump 8 are temporarily removed from the production bore 11, and the pulse generator 1 is provided at its lower and upper ends with packing disks P which correlate with the inside diameter of the filter tube W located in the production bore 11. Then the pulse generator 1 provided with the packer discs P is lowered to an end portion of the filter tube W, and by means of the pressure unit 6 a z.
• the packer disks P are removed from the pulse generator 1, the pulse generator 1 and the underground pump 8 are again introduced into the production borehole, and the regeneration liquid becomes complete after a defined exposure time by moving the pulse generator 1 up and down and with simultaneous successive transmission of weak hydraulic energy pulses by the pulse generator 1 by means of the underground pump 8 together with the released colmatants pumped out.
• the method for intensifying the permeability of borehole layers close to the bore and of filter bodies and filter layers in the underground production area of wells and other production wells can also be used with advantage especially for well regeneration if the wells with particularly brittle filter tubes e.g. B. made of stoneware or aged PVC and the filter layers are also heavily cumulated.
• particularly brittle filter tubes e.g. B. made of stoneware or aged PVC and the filter layers are also heavily cumulated.

Landscapes

• Geology (AREA)
• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Mining & Mineral Resources (AREA)
• Environmental & Geological Engineering (AREA)
• Fluid Mechanics (AREA)
• Physics & Mathematics (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Geochemistry & Mineralogy (AREA)
• Geophysics And Detection Of Objects (AREA)
• Sewage (AREA)
• Separation Using Semi-Permeable Membranes (AREA)
• External Artificial Organs (AREA)
• Drilling And Boring (AREA)

Applications Claiming Priority (5)

Publications (3)

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Family Applications (1)

Country Status (6)

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Family Cites Families (8)

• 2003
  • 2003-12-18 DE DE10361983A patent/DE10361983B4/de not_active Expired - Lifetime
• 2004
  • 2004-01-08 AT AT04700687T patent/ATE326610T1/de active
  • 2004-01-08 EP EP04700687A patent/EP1583887B8/fr not_active Expired - Lifetime
  • 2004-01-08 DE DE502004000586T patent/DE502004000586D1/de not_active Expired - Lifetime
  • 2004-01-08 ES ES04700687T patent/ES2260745T3/es not_active Expired - Lifetime
  • 2004-01-08 WO PCT/EP2004/000056 patent/WO2004063524A1/fr not_active Ceased
  • 2004-01-08 US US10/541,945 patent/US7360596B2/en not_active Expired - Lifetime

Non-Patent Citations (1)

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