RU2361115C1 - Bottomhole pump set for product lifting along well flow string - Google Patents

Bottomhole pump set for product lifting along well flow string Download PDF

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Publication number
RU2361115C1
RU2361115C1 RU2008112335/06A RU2008112335A RU2361115C1 RU 2361115 C1 RU2361115 C1 RU 2361115C1 RU 2008112335/06 A RU2008112335/06 A RU 2008112335/06A RU 2008112335 A RU2008112335 A RU 2008112335A RU 2361115 C1 RU2361115 C1 RU 2361115C1
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RU
Russia
Prior art keywords
packer
cylinder
tailpiece
well
shank
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RU2008112335/06A
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Russian (ru)
Inventor
Владимир Михайлович Валовский (RU)
Владимир Михайлович Валовский
Георгий Юрьевич Басос (RU)
Георгий Юрьевич Басос
Константин Владимирович Валовский (RU)
Константин Владимирович Валовский
Любовь Владимировна Осипова (RU)
Любовь Владимировна Осипова
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Открытое акционерное общество "Татнефть" им. В.Д. Шашина
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Priority to RU2008112335/06A priority Critical patent/RU2361115C1/en
Application granted granted Critical
Publication of RU2361115C1 publication Critical patent/RU2361115C1/en

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Abstract

FIELD: engines and pumps.
SUBSTANCE: invention is related to oil production industry and may be used for operation of production wells, including the ones with highly viscous produce, and also in wells of small diametre. Bottomhole pump set includes sucker-rod pump comprising cylinder, receiving valve, plunger with controlled injection valve, which is connected to string of pump rods with positioners, packer and relief device. Downstream relief device hollow tailpiece is arranged, which consists of upper and lower parts. Additional relief device is located in tailpiece. Packer is arranged in the form of self-sealing collars with distance between neighboring self-sealing collars that exceeds distance between ends of pipes in coupler joints of flow string, and support. Downstream packer and upstream support tailpiece is equipped with side holes. Additional relief device is arranged in the form of cylinder connected to lower part of tailpiece, with side channels that communicate to internal cavity of tailpiece and hollow piston connected to upper part of tailpiece, with the possibility of limited axial displacement downwards relative to cylinder with tight overlapping of connection between side channels of cylinder and internal cavity of tailpiece.
EFFECT: provides for considerable reduction of laboriousness of installation -dismantling and makes it possible to reduce time required for set lowering-lifting in well, and also to expand field of its application due to possibility to use it in wells of small diametre.
2 dwg

Description

The invention relates to the oil industry and can be used for the operation of producing wells, including highly viscous products, as well as in small diameter wells.
A well-known deep-well pumping unit with a casing pump (Oil production by deep-well sucker rod pumps. Scheller-Bleckmann GMBH, Ternitz, Austria, 1988, p. 24). The downhole pump installation includes a borehole pump with a mount, a string of pump rods with centralizers, and an anchor packer installed in the casing of the well. The sucker rod pump is lowered into the well on the string of sucker rods, and at a given depth, the attachment point is fixed in the anchor packer. When the pump is running, the well production is lifted along the casing string.
Disadvantages of a downhole pump installation:
- the impossibility of killing a well during repair involves the use of the installation only in wells having reservoir pressure below hydrostatic, which narrows the scope of the installation;
- low filling coefficient of the sucker rod pump, since all the gas coming from the reservoir together with the liquid enters the pump, since the anchor packer cuts the filter cavity of the well from the injection.
The closest in technical essence and the achieved result is a "Deep-pumping unit for the operation of producing wells" (patent RU No. 33180, F04B 47/02, publ. Bull. No. 28 from 10.10.2003), including a sucker rod pump containing a cylinder , a receiving valve, a plunger with a controlled discharge valve, attached to the column of sucker rods with centralizers, a mounting unit, an anchor packer and a bypass device located between the receiving valve and the mounting unit.
The disadvantage of the installation is the high complexity of the installation, and if necessary, the dismantling of the anchor packer at a given depth. In addition, in small diameter wells, the installation of an anchor packer is not possible, which narrows the scope of the installation.
An object of the invention is to reduce the complexity of installation-dismantling and reducing the time of the lowering and lifting of the installation in the well, as well as expanding the scope of its application due to the possibility of using small diameter wells.
The technical problem is solved by a downhole pump installation including a sucker rod pump containing a cylinder, a suction valve, a plunger with a controlled discharge valve, connected to a string of pump rods with centralizers, a packer and a bypass device.
New is that the deep-pumping unit below the bypass device is equipped with a hollow shank consisting of upper and lower parts, with an additional bypass device, a packer made in the form of self-sealing cuffs with a distance between adjacent self-sealing cuffs exceeding the distance between the ends of the pipes in the coupling the connections of the production casing and the stop, and below the packer and above the stop, the shank is provided with side openings, and an additional bypass device is made in in the form of a cylinder connected to the lower part of the shank, with side channels communicating with the inner cavity of the shank, and a hollow piston connected to the upper part of the shank, with the possibility of limited axial movement downward relative to the cylinder with hermetic overlap of the message between the side channels of the cylinder and the inner cavity of the shank.
Figure 1 schematically shows a General view of a deep-well pumping installation, figure 2 is the same when it is lowering-rising in the well.
The downhole pumping unit (see Fig. 1) includes a sucker-rod pump 1, consisting of a cylinder 2, a suction valve 3, a plunger 4 with a controllable discharge valve 5 connected to a string of pump rods 6 with centralizers 7. Underneath the suction valve 3, a bypass device 8. Below the bypass device 8 is a hollow shank 9, consisting of the upper 10 and lower 11 parts. On the lower part 11 of the shank 9 there is a packer 12, made in the form of self-sealing cuffs 13, and a stop 14. Below the packer 12 and above the stop 14, the shank is provided with side holes 15 and 16. An additional bypass device 17, made in the form of a cylinder 18, is located on the shank 9 connected to the lower part 11 of the shank 9, with side channels 19 (see figure 2), communicating with the inner cavity 21 of the shank 9, and a hollow piston 20 connected to the upper part 10 of the shank 9. The hollow piston 20 is made limited axial moving downward relative to the cylinder 18 (see FIG. 1). The axial displacement of the hollow plunger 20 can be achieved by the constrictions 22 and 23 made at the ends of the cylinder 18. The tightness of the overlap between the side channels 19 and the inner cavity 21 of the shank 9 can be achieved by several options, for example, the lateral channels 19 of the cylinder 18 are blocked by an external cylindrical surface hollow piston 20 (see figure 1) or by the interaction of the lower end of the hollow piston with the lower narrowing of the cylinder using sealing materials (not shown).
The downhole pumping unit operates as follows. The downhole pump installation is assembled at the operating site and on the string of pump rods 6 (see FIG. 2), lowered into the well 24. When the equipment is lowered, the cylinder 18 connected to the lower part 11 of the shank 9 hangs on the hollow piston 20 under the action of gravity connected to the upper part 10 of the shank 9, while the hollow piston 20 interacts with the narrowing 22 of the cylinder 18. In this position of the hollow piston 20 relative to the cylinder 18, the side channels 19 of the additional bypass device 17 are open, and through them the cavity 21 of the shank 9 communicates with the cavity 25 well 24 located above the packer 12. The fluid located in the well 24 flows through the side hole 15 of the shank 9 through its cavity 21 and then through the holes 19 of the additional bypass device 17 into the cavity 25 of the well 24.
At the end of the descent of the equipment, the lower part 11 of the shank 9 (see Fig. 1) is installed through the stop 14 on the bottom 26 of the well 24. The hollow piston 20 connected to the upper part 10 of the shank 9 continues to move relative to the cylinder 18 mounted on the lower part 11 of the shank 9, and abuts against the narrowing 23 of the cylinder 18. In this position of the hollow piston 20 relative to the cylinder 18, the communication between the side channels 19 of the cylinder 18 and the inner cavity 21 of the liner 9 is tightly closed. The cavity 25 of the well 24 located above the packer 12 is reliably communicates with the cavity 27 of the well 24, located under the packer 12.
After adjusting the length of the string of pump rods 6, the submersible pumping unit is put into operation. The drive (not shown) through the column of sucker rods 6 with centralizers 7 transmits to the plunger 4 reciprocating motion. Well products and all gas leaving the producing formation 28 enter the sucker rod pump 1 from the under-packer cavity 27 of the well 24 through the side openings 15 through the cavity 21 of the liner 9 and are pumped into the over-pack cavity 25 of the well 24, through which the product is lifted to the wellhead 29 and then to pressure line.
Further work cycles are repeated.
Centralizers 7 prevent mutual contact and wear of the string of pump rods 6 and the inner surface of the walls of the well 24.
In the plunger 4, a controlled discharge valve 5 is used, which opens at the beginning of the movement of the column string 6 downward regardless of the pressure drop above and below the discharge valve 5, which is achieved by tight connection of the locking element of the controlled discharge valve 5 with the column of pump rods 6. At the same time, it falls into the rod the pump 1 together with the production of gas through an open controlled discharge valve 5 enters the nadpakerny cavity 25 of the well 24. The use of a plunger 4 with a controlled discharge valve 5 allows to reduce s detrimental effect on the gas efficiency and performance of the pump 1. Since the beginning stroke of the rod string 6 upward discharge valve 5 closes, the pressure decreases below the plunger 4 opens receiving valve 3 and the well production enters the pump 1.
A bypass device 8 is located under the suction valve 3 of the sucker rod pump 1, which allows killing during the repair of the well 24. Muffler under pressure is supplied to the over-packer cavity 25 of the well 24 from the wellhead 29, and when the overpressure in the over-packer cavity 25 is created higher than the calculated allowable bypass, the bypass device 8 is activated (for example, the membrane 30 is destroyed), the over-packer cavity 25 of the well 24 communicates with the cavity 21 of the liner 9 and through its side openings 15 with a sub-packer cavity 27 of the well 24, while the fluid in the well 24 is forced into the reservoir 28 and replaced by a kill fluid.
An additional bypass device 17, mounted above the self-sealing packer 12, allows you to inform the packer 25 (see Fig. 2) and the packer 27 of the well cavity 24 when lowering and raising the equipment, which eliminates the fluid being pinched by the packer 12 when the equipment moves along the wellbore 24. This is significant reduces the time of lowering the equipment into the well 24 during installation, and during dismantling, it allows you to remove all the equipment from the well 24 with an ordinary column of pump rods 6, because it is not loaded by the weight of the liquid column in the well 24. for the same reason, the wellhead area is not contaminated with well fluid since all fluid remains in the well 24.
The implementation of the packer 12 with self-sealing cuffs 13 eliminates the additional operation of landing the packer at a given depth in the well 24 using a special tool, lowered on the pipe string, and then removing this tool, as well as expanding the scope of the installation in small diameter wells, where the use of the tool landing a packer is difficult or impossible.
The packer 12 contains at least two self-sealing cuffs 13, and the distance between adjacent cuffs exceeds the distance between the ends of the pipes in the coupling joints (not shown) of the production casing 31 of the well 24, which eliminates such a time-consuming and costly operation as determining the location of the coupling the junction of the production casing 31, and also makes it possible to avoid a careful adjustment of the length of the shank 9, because even if one of the self-sealing cuffs 13 of the packer 12 accidentally ends up in m pipe connection, the second will reliably disconnect the overpacker 25 and subpacker 27 of the well cavity 24. When the unit is put into operation, the fluid pressure in the overpacker cavity 25 will exceed the fluid pressure in the subpacker cavity 27, and the greater the pressure drop above and below the packer 12, the with great effort, the self-sealing cuffs 13 will be pressed against the walls of the production string 31, providing a tight separation of the aforementioned cavity of the well 24.
The use of the shank 9, which rests on the bottom 26 of the well 24, allows you to install the downhole equipment at a given depth in the well 24 and eliminates its spontaneous movement under the action of dynamic loads that occur during the operation of the downhole pump unit. The total length of the shank 9 is determined by the distance from the bottom face 26 of the well 24 to the predetermined location of the rod pump 1, while the length of the lower part 11 of the shank 9 should ensure the location of the packer 12 in the well 24 above the reservoir 28. An emphasis 14 is installed at the lower end of the shank 9, increasing the area supports and, accordingly, reducing the specific pressure from the weight of the equipment and the fluid column in the well 24 to the bottom 26. Holes 16, made at the lower end of the shank 9, allow the well fluid to merge from the cavity 21 ika 9 when removing equipment from the hole 24 and prevent contamination of the wellhead platform.
Using the proposed deep-well pumping unit for lifting products along the production casing of the well can significantly reduce the complexity of installation-dismantling and reduce the time of launching and lifting the installation in the well, as well as expand its scope due to the possibility of using small diameter wells.

Claims (1)

  1. A downhole pump installation including a sucker rod pump comprising a cylinder, a receiving valve, a plunger with a controlled discharge valve, connected to a string of pump rods with centralizers, a packer and a transfer device, characterized in that the downhole pump installation below the transfer device is provided with a hollow shank consisting of from the upper and lower parts, with an additional bypass device, a packer made in the form of self-sealing cuffs with a distance between adjacent self-sealing cuffs more than the distance between the ends of the pipes in the coupling joints of the production string and the stop, and below the packer and above the stop, the shank is provided with side openings, and an additional bypass device is made in the form of a cylinder connected to the lower part of the shank, with side channels communicating with the internal cavity the shank and the hollow piston connected to the upper part of the shank, with the possibility of limited axial movement downward relative to the cylinder with a tight overlap of the message between the side channels and the interior cavity of the cylinder liner.
RU2008112335/06A 2008-03-31 2008-03-31 Bottomhole pump set for product lifting along well flow string RU2361115C1 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102338073A (en) * 2010-07-19 2012-02-01 山东寿光市坤隆石油机械股份有限公司 Energy-saving oil well pump and installation method
RU2621583C1 (en) * 2016-07-27 2017-06-06 Публичное акционерное общество "Татнефть" имени В.Д. Шашина Deep-well pumping unit for lifting products in production string
CN110905467A (en) * 2018-09-17 2020-03-24 中国石油天然气股份有限公司 Injection and production dual-purpose tubular column structure
RU2738615C1 (en) * 2020-07-13 2020-12-14 Публичное акционерное общество «Татнефть» имени В.Д. Шашина Method for simultaneous separate production of oil from two formations of one well by production string
RU2740375C1 (en) * 2020-08-10 2021-01-13 Общество с ограниченной ответственностью "ЛУКОЙЛ-ПЕРМЬ" Well pumping unit with anchor unit for pipeless operation of small-diameter wells

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102338073A (en) * 2010-07-19 2012-02-01 山东寿光市坤隆石油机械股份有限公司 Energy-saving oil well pump and installation method
CN102338073B (en) * 2010-07-19 2013-11-27 山东寿光市坤隆石油机械股份有限公司 Energy-saving oil well pump and installation method
RU2621583C1 (en) * 2016-07-27 2017-06-06 Публичное акционерное общество "Татнефть" имени В.Д. Шашина Deep-well pumping unit for lifting products in production string
CN110905467A (en) * 2018-09-17 2020-03-24 中国石油天然气股份有限公司 Injection and production dual-purpose tubular column structure
RU2738615C1 (en) * 2020-07-13 2020-12-14 Публичное акционерное общество «Татнефть» имени В.Д. Шашина Method for simultaneous separate production of oil from two formations of one well by production string
RU2740375C1 (en) * 2020-08-10 2021-01-13 Общество с ограниченной ответственностью "ЛУКОЙЛ-ПЕРМЬ" Well pumping unit with anchor unit for pipeless operation of small-diameter wells

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