EP2730740A1 - Dispositif pour briser une roche de formation d'un puits - Google Patents

Dispositif pour briser une roche de formation d'un puits Download PDF

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Publication number
EP2730740A1
EP2730740A1 EP12191755.3A EP12191755A EP2730740A1 EP 2730740 A1 EP2730740 A1 EP 2730740A1 EP 12191755 A EP12191755 A EP 12191755A EP 2730740 A1 EP2730740 A1 EP 2730740A1
Authority
EP
European Patent Office
Prior art keywords
piston
space
fracturing
chamber
end plate
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.)
Withdrawn
Application number
EP12191755.3A
Other languages
German (de)
English (en)
Inventor
Vladimir Dr. Danov
Daria Mustafina
Sergey Sotskiy
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to EP12191755.3A priority Critical patent/EP2730740A1/fr
Publication of EP2730740A1 publication Critical patent/EP2730740A1/fr
Withdrawn legal-status Critical Current

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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
    • E21B43/25—Methods for stimulating production
    • E21B43/26—Methods for stimulating production by forming crevices or fractures

Definitions

  • the invention relates to a device for fracturing the formation rock of a well.
  • hydraulic fracturing is usually applied.
  • a well-known approach is to pump a fracturing fluid down the wellbore at pressures of 500 to 1000 bar. This leads to the development of cracks within the formation and to the extension of existing crack systems, providing flow paths for the fluids from the formation to the wellbore.
  • pulsed pressurization method based on creating hydraulic pressure pulses from within the well. This method works particularly well in gas shales composed of relatively ductile rocks.
  • a device for pulsed pressurization of wellbores is disclosed in US 3 422 760 A .
  • the device consists of a housing with several gas-generating charges, which can be lowered into the wellbore. With the device in place, the charges are ignited and rupture pressure seals at predetermined pressures, thereby creating the desired shock waves within the formation rock.
  • Such a device for fracturing the formation rock of a well by generating hydraulic pressure pulses within the wellbore comprises a chamber and a piston moveable relative to each other and a linear motor for driving the relative motion of chamber and piston.
  • the device can be lowered into the wellbore, where the relative movement of piston and chamber is initiated. Due to the low compressibility of the fluid in the bore, such movements lead to high pressure waves which in turn lead to the desired fracturing of the formation rock. Since the device can be precisely placed within the wellbore, fracturing can be finely controlled.
  • the use of an electric linear motor to drive the motion allows for an unlimited number of pulses without the need to replace the device, thereby saving time and costs.
  • the relative movement of piston and chamber can be precisely controlled via the electric linear motor.
  • the fracturing parameters can be fine-tuned to the geological conditions in the formation rock, thus improving the fracturing result.
  • the piston is fixed relatively to the linear motor, while the chamber is movably supported.
  • the chamber can be fixed, while the linear motor drives the movement of the piston.
  • the device comprises an end plate oriented upwards when the device is inserted into the wellbore.
  • This plate is designed to provide a smooth fit of the device within the well's casing and separates the space above the device from the space below, so that the generated pressure waves are confined to the borehole area below the device. In this manner, the energy of the pressure waves are directed more efficiently to the formation, yielding better fracturing results.
  • the device comprises a first fluid communication channel connecting the space between the piston and the end plate to the space above the end plate. This allows for pressure equilibration after a movement cycle of the device is complete. The same role is filled by a second fluid communication channel connecting the space below the piston to the space above the end plate.
  • the fluid communication channels are preferably of a small diameter compared to the wellbore diameter, so that the pressure buildup is not hampered.
  • first and/or second fluid communication channel comprises at least one check valve preventing backflow from the space above the end plate into the respective other space connected to the fluid communication channel, so as to better control the fluid flow during device operation.
  • a device 10 for fracturing the formation rock of oil or gas wells comprises a cylindrical mantle 12 which fits the inside of the well's casing 14.
  • the stator part 16 of an electrical linear motor 18 is mounted on the inner surface of the mantle 12.
  • the moveable part 20 of the linear motor 18 forms a chamber enclosing a fixed piston 22.
  • the chamber 20 is closed against the inner volume of the casing 14 by end plates 24, which contain check valves 26 to allow the influx of fluid into the chamber 20.
  • the piston 22 is fixed to a hollow tube 28 which extends throughout the device 10 and through the device's end plate 30 and opens into the space 32 in the casing 14 above the device 10.
  • the tube 28 further connects to the hollow interior 34 of the piston 22, which in turn is connected to the space 36 above and the space 38 below the piston with respective check valves 26 allowing fluid to enter the piston 22.
  • the chamber 20 moves periodically up and down relative to the piston 22, alternatively compressing the fluid in the spaces 36, 38, while the check valves 26 allow for a slow reequilibration of pressure.
  • the compression waves generated this way propagate through the borehole and into the formation rock, where they induce the desired fracturing.
  • FIG 2 An alternative design is depicted in FIG 2 .
  • the chamber 20 is fixed relative to the stator 16, while the piston 22 forms the moveable part of the linear motor 18.
  • the piston 22 is solid and moves on a solid axis 40.
  • the space 36 above the piston 22 is connected to the space 32 above the device 10 by a first tube 42 with a check valve 26 opening to the space 32.
  • the space 38 below the piston 22 connects to the space 32 via a second tube 44 with a check valve 26 also opening to the space 32.
  • Another check valve 26 in the lower end plate 24 of the chamber 22 allows fluid to enter the lower space 38, whereas a check valve 26 in the upper end plate 24 of the chamber serves as point of entry for fluids into the upper space 36.
  • the localized application of pressure by using the device 10 helps to constrain the fracturing to the oil or gas bearing formation itself and to avoid damage to the overburden, alleviating environmental concerns associated with conventional fracturing techniques, such as the contamination of aquifers by fracturing fluids.

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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)
  • Reciprocating Pumps (AREA)
EP12191755.3A 2012-11-08 2012-11-08 Dispositif pour briser une roche de formation d'un puits Withdrawn EP2730740A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12191755.3A EP2730740A1 (fr) 2012-11-08 2012-11-08 Dispositif pour briser une roche de formation d'un puits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12191755.3A EP2730740A1 (fr) 2012-11-08 2012-11-08 Dispositif pour briser une roche de formation d'un puits

Publications (1)

Publication Number Publication Date
EP2730740A1 true EP2730740A1 (fr) 2014-05-14

Family

ID=47172485

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12191755.3A Withdrawn EP2730740A1 (fr) 2012-11-08 2012-11-08 Dispositif pour briser une roche de formation d'un puits

Country Status (1)

Country Link
EP (1) EP2730740A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020103393A1 (fr) * 2018-11-21 2020-05-28 重庆地质矿产研究院 Outil de fracturation hydraulique à impulsions de type à scellage de fond de courroie de traînage de tube spiralé et procédé

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3422760A (en) 1966-10-05 1969-01-21 Petroleum Tool Research Inc Gas-generating device for stimulating the flow of well fluids
US20050260089A1 (en) * 2001-03-13 2005-11-24 Baker Hughes Incorporated Reciprocating pulser for mud pulse telemetry

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3422760A (en) 1966-10-05 1969-01-21 Petroleum Tool Research Inc Gas-generating device for stimulating the flow of well fluids
US20050260089A1 (en) * 2001-03-13 2005-11-24 Baker Hughes Incorporated Reciprocating pulser for mud pulse telemetry

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020103393A1 (fr) * 2018-11-21 2020-05-28 重庆地质矿产研究院 Outil de fracturation hydraulique à impulsions de type à scellage de fond de courroie de traînage de tube spiralé et procédé
US11098566B2 (en) 2018-11-21 2021-08-24 Chongqing Institute Of Geology And Mineral Resources Pulse hydraulic fracturing tool and method for coiled tubing dragging with bottom packer

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