RU2483228C1 - Pumping rod borehole plant with double-acting pump - Google Patents

Pumping rod borehole plant with double-acting pump Download PDF

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Publication number
RU2483228C1
RU2483228C1 RU2012100579/06A RU2012100579A RU2483228C1 RU 2483228 C1 RU2483228 C1 RU 2483228C1 RU 2012100579/06 A RU2012100579/06 A RU 2012100579/06A RU 2012100579 A RU2012100579 A RU 2012100579A RU 2483228 C1 RU2483228 C1 RU 2483228C1
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Russia
Prior art keywords
piston
pump
plunger
packer
above
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RU2012100579/06A
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Russian (ru)
Inventor
Георгий Юрьевич Басос
Константин Владимирович Валовский
Владимир Михайлович Валовский
Александр Иванович Рыжиков
Рустем Халитович Саетгараев
Original Assignee
Открытое акционерное общество "Татнефть" имени В.Д. Шашина
Управляющая компания общество с ограниченной ответственностью "ТМС групп"
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Application filed by Открытое акционерное общество "Татнефть" имени В.Д. Шашина, Управляющая компания общество с ограниченной ответственностью "ТМС групп" filed Critical Открытое акционерное общество "Татнефть" имени В.Д. Шашина
Priority to RU2012100579/06A priority Critical patent/RU2483228C1/en
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Publication of RU2483228C1 publication Critical patent/RU2483228C1/en

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Abstract

FIELD: oil and gas industry.
SUBSTANCE: plant includes a casing string with two entered formations, a pump lowered on a pipe string located in the casing string so that an inter-tube space is formed between them, which is separated with a packer located between entered formations. A pump is equipped with a plunger, an injection valve and a piston, which have the possibility of back-and-forth movement, upper and lower inlet holes with suction valves located above the packer and above and below the packer respectively. The pump outlet is interconnected from above by means of a pipe string through an injection valve to the well head, and from below through the lower injection valve to the space under the packer. The piston is free and has the possibility of interaction from above with the plunger and restricted back-and-forth movement. The plunger is equipped from below with a stock inserted into the piston with possibility of restricted back-and-forth movement. In the casing string there additionally arranged is a tube with a check valve, which connects the pump cavity between the piston and the lower injection valve with a delivery line through a shutoff member and the wellhead measurement equipment.
EFFECT: improving the oil extraction efficiency from the flooded well owing to providing direct control of quality and quantity of water pumped by a pump to the bottom formation of the well.
2 dwg

Description

The invention relates to the oil industry and can be used for the operation of highly watered oil wells.

The well-known "Double-acting pump system" (US patent No. 5497832, IPC ЕВВ 43/38, ЕВВ 43/40 dated 03/12/1996), containing a casing string with two exposed formations, a pump running on a pipe string located in the casing string with the formation of the annular space between them, which is separated by a packer located between the exposed layers, and the pump is equipped with a plunger, a discharge valve and a piston connected to the plunger, made with the possibility of reciprocating movement, the upper and lower inlets with suction with valves located above the packer and, respectively, above and below the piston, while the pump outlet from above through the pipe string is communicated through the discharge valve with the wellhead, and from below through the lower discharge valve with the under-packer space. This installation allows you to pump a significant portion of the associated water into the underlying layer opened by the well without lifting it to the surface, thereby significantly reducing the cost of oil.

A disadvantage of the known device is that the parameters of the pumping equipment are selected for a given water cut of the well production, and during operation, the percentage of the amount of fluid raised at the wellhead and the amount of fluid pumped into the underlying formation remains unchanged. However, during the operation of the well, the water cut of its products may change. At the same time, with an increase in water cut, the amount of water raised with oil to the surface will increase, which will reduce operating efficiency, and with a decrease in water content, a certain amount of oil will be pumped along with water into the underlying formation, which will lead to a loss in oil production and lower injectivity of the underlying formation.

The closest in technical essence and the achieved result is “Installation of a borehole sucker rod pump with a double-acting pump” (patent RU No. 2364708, IPC Е21В 43/00, Е21В 43/38, publ. Bulletin No. 23 of 08/20/2009), comprising a casing with two exposed layers, a pump running on a pipe string located in the casing with the formation of an annulus between them, which is separated by a packer located between the opened layers, the pump is equipped with a plunger, pressure valve and piston, made with the reciprocating movement, the upper and lower inlets with suction valves located above the packer and, respectively, above and below the piston, while the pump outlet from above through the pipe string is communicated through the discharge valve with the flow line of the wellhead, and from the bottom through the lower discharge valve with under-packer space, while the piston is made free with the possibility of interaction from above with the plunger and limited reciprocating movement, and the plunger from the bottom is equipped with nd inserted into the piston for limited reciprocation.

A disadvantage of the known installation is the lack of quality control and the amount of water pumped into the underlying formation by the pump, which reduces the efficiency of the well operation, since in order to exclude the possible injection of oil together with water into the lower formation, it is necessary to raise oil to a surface with a sufficiently high water content, and the lack of actual data on the volume of injected water and, as a result, the actual flow of fluid from the reservoir into the well, makes it difficult to plan and conduct geological technical events.

An object of the invention is to increase the efficiency of exploitation of flooded wells by providing direct control of the quality and quantity of water pumped into the underlying formation of the well by the pump.

The specified technical problem is solved by installing a downhole sucker rod pump with a double-acting pump (hereinafter referred to as the installation), containing a casing string with two exposed layers, a pump running on a pipe string located in the casing pipe with the formation of an annular space between them, which is separated by a packer located between open layers, and the pump is equipped with a plunger, pressure valve and piston, made with the possibility of reciprocating movement, the upper and lower inlets with suction valves located above the packer and, respectively, above and below the piston, while the pump outlet from above via a pipe string is communicated through a discharge valve with a flow line of the wellhead, and from below through a lower discharge valve with a sub-packer space, while the piston is made free with the possibility of interaction from above with the plunger and limited reciprocating movement, and the plunger from the bottom is equipped with a rod inserted into the piston with the possibility of limited reciprocating th move.

New is that in the casing is additionally placed a pipe with a check valve that communicates the pump cavity between the piston and the lower discharge valve with a flow line through the shut-off element and wellhead measuring equipment.

Figure 1 schematically shows a General view of the installation, figure 2 is the same, with the extreme top location of the plunger and piston.

The installation (see figure 1) contains a casing 1 with two exposed layers 2 and 3, a pump 4, run on a pipe string 5 located in the casing 1 with the formation of the annular space 6 between them, which is separated by a packer 7 located between the opened layers 2 and 3. The pump 4 is equipped with a plunger 8, a discharge valve 9 and a piston 10, made with the possibility of reciprocating movement, the upper 11 and lower 12 inlet openings located above the packer 7 and, respectively, above and below the piston 10. Upper 11 and lower 12 inputs e holes are equipped with suction valves 13 and 14, respectively. The outlet of the pump 4 from above through the pipe string 5 is communicated through the discharge valve 9 with the discharge line 15 of the mouth 16 of the well 17, and from the bottom through the lower discharge valve 18 with the under-packer space 19.

The piston 10 is located in the cylinder 20 of the pump 4 freely with the possibility of limited reciprocating motion. From above, the movement of the piston 10 is limited by the plunger 8, and from below, for example, by a sleeve 21 that does not allow the piston 10 to leave the cylinder 20. The plunger 8 is equipped with a stem 22 from below, which is placed in the cavity 23 of the piston 10 with a limited possibility (for example, by using a thickening 24 on the lower end of the rod 22, the diameter of which is larger than the diameter of the hole 25 in the upper end of the piston 10) of the reciprocating movement of the piston 10 relative to the rod 22.

Parallel to the pipe string 5, a pipe 26 with a check valve 27 is placed in the casing 1, which communicates the cavity 28 of the pump 4 between the piston 10 and the lower discharge valve 18 with a flow line 15 through the shut-off element 29 and wellhead measuring equipment 30.

Installation works as follows.

When installing the installation in the well 17, the descent of the rod string 31 with the plunger 8 connected to it with the piston 10 is carried out until the stop of the plunger 8 through the piston 10 into the sleeve 21. Then the column of the rods 31 is slightly raised and its length is adjusted so that in the extreme lower position of the column rods 31 during operation of the installation to exclude the knock of the piston 10 about the sleeve 21, after which the installation is put into operation. Waterlogged products from the opened reservoir 2 enter the annulus 6 of the casing 1. Oil 32, having a lower density, floats upward, while in the lower part of the annulus 6 between the opened reservoir 2 and the packer 7 there will always be water 33 having a large density. The installation drive (not shown in FIG. 1) informs the rod string 31 and the plunger 8 connected to it with the piston 10 reciprocating motion.

At the beginning of the stroke of the rod string 31, the plunger 8 of the pump 4 will begin to move upward relative to the cylinder 20 and the piston 10 located therein. In this case, in the cavity 34 of the cylinder 20 between the plunger 8 and the piston 10, the pressure will become less than the fluid pressure in the cavity 35 of the cylinder 20 under the piston 10, which is currently equal to the pressure of the height of the liquid column in the annulus 6, since this pressure acts on the piston 10 from the bottom through the lower inlet 12 and the opening suction valve 14. Thus, when the plunger 8 moves upward, the piston 10 p d of differential pressures above and below it will follow up the plunger 8, the cavity 35 in the cylinder 20 below the piston 10 through a lower inlet opening 12 and open the suction valve 14 receives water 33.

The piston 10 rises behind the plunger 8 until the cavity 34 (see FIG. 2) communicates with the upper inlet 11, after which the plunger 8 continues to move upward and the piston 10 stops, since the pressure of the liquid above and below it is equalized and becomes equal to the height of the liquid column in the annular space 6. With the further progress of the plunger 8 upward, the volume of the cavity 34 increases, and oil 32 enters through the upper inlet 11 and the open suction valve 13 under the influence of liquid pressure in the annular space 6 until op until the plunger 8 will not stop in the highest position. The suction valves 13 and 14 of the inlets 11 and 12 are closed.

Then the column of rods 31 with the plunger 8 begins to move down. The fluid pressures in the cavity 36 of the cylinder 20 above the plunger 8, as well as in the cavities 34 and 35 located respectively above and below the piston 10, are compared, and with the further plunger 8 moving downward, the pressure valve 9 opens. The fluid from the cavity 34 flows through the axial channel 37 the plunger 8 into the cavity 36 of the cylinder 20. The piston 10 remains in place for now, since it needs to open the lower discharge valve 18 to move downward, which is prevented by the formation pressure of the lower layer 3 acting on it from below.

Next, the plunger 8 (see figure 1) reaches the piston 10 and under the influence of the weight of the column of rods 31 moves it down. In this case, due to the weight of the rod string 31 under the piston 10, a pressure is created that exceeds the reservoir pressure of the lower layer 3. The lower discharge valve 18 is opened, and the water 33 entering through the lower inlet 12 into the cavity 28 of the pump 4 during the previous stroke of the rod string 31 up Under the influence of this pressure, it is pumped into the under-packer space 19 and pressed into the lower layer 3.

Thus, during the operation of the installation, the main amount of water 33 entering the well 17 together with oil 32 from the productive formation 2 is pumped into the lower formation 3, and all oil 32 with some amount of water 33 rises along the pipe string 5 to the mouth 16 and then to flow line 15.

If we take the entire stroke length of the plunger 8 as 100%, then when operating a well in which fluid with a water content of, for example, 80% comes from the reservoir, the plunger 8 must be positioned in the cylinder 20 so that the lower end of the plunger 8 can move relative to the upper the inlet 11 downward by no more than 80% and upward by not less than 20% of the stroke length of the plunger 8.

During the operation of the well 17, the water cut of the fluid coming from the reservoir 2 and, accordingly, entering the flow line 15 of the product may change. With an increase in water cut, it is necessary to reduce the distance by which the lower end of the plunger 8 moves upward relative to the upper inlet 11, and accordingly increase the distance by which the lower end of the plunger 8 moves downward relative to the upper inlet 11, which is achieved by lowering the rod string 31 down. As a result, more water 33 will be pumped into the underlying reservoir 3 and less liquid, but with less water cut, will rise to the surface. At the same time, the productivity of the selection of fluid from the reservoir 2 will not change.

When reducing the water content of the product raised to the surface, the rod string 31 needs to be raised, the amount of fluid raised to the mouth 16 will increase, the amount of water 33 pumped into the underlying formation 3 will decrease.

During the operation of the installation, a slight increase in the friction forces is possible due to the interaction of the surfaces of the plunger 8 and the piston 10 with the cylinder 20 due to, for example, an increase in the content of mechanical impurities in the products of the formation 2 and the piston 10 will stick together. the cylinder 20 remains in place, since the differential pressure may not be enough to move the piston 10 after the plunger 8. The rod 22 moves upward in the cavity 23 of the piston 10 until the bulge 24 at the lower end of the rod reaches to the upper end of the piston 10, while in the enlarged cavity 34, a vacuum is generated, since it cannot be filled with anything. After that, the piston 10 moves away, since the diameter of the hole 25 is less than the diameter of the bulge 24. Then, if nothing moves the piston 10, which is moved from the place, it will move up to the plunger 8 under the influence of the differential pressure, or, if something else prevents it from moving up and the pressure drop is not enough for this, the piston 10 will move up with a bulge 24 at the lower end of the rod 22 at a certain distance from the plunger 8, determined by the length of the rod 22, that is, it will move up with the discharge ennoy cavity 34. When the cavity 34 communication with the upper inlet opening 11, the suction valve 13 by fluid pressure in annular space 6 opens, and into the cavity 34 goes oil 32.

Next, the installation cycles are repeated.

Additionally placed in the well 17, the tube 26 allows you to control the quality and quantity of water 33 pumped into the lower layer 3, for which, during installation, the shut-off element 29 is opened, and the water 33 coming from the annular space 6 through the lower inlet 12 into the cavity 28 pump 4 during the course of the rod string 31 upward, while the piston 10 moves under the influence of the weight of the rod string 31 downwardly is pumped through the check valve 27 into the tube 26, from where it enters the wellhead measuring equipment 30 through the open shut-off element 29, e.g. measures in the sampler, followed by laboratory analysis of the water sample for the presence of oil in it, and (or) in the flow analyzer of oil in water (not shown in Fig. 1) with the transmission of readings on the concentration of oil in water to the control room, and then to the wellhead a flow meter (not shown in FIG. 1), after which it enters the flow line 15. Using the sum of the readings of the wellhead flow meter and previously taken readings of the flow meter of the group metering unit (not shown in FIG. 1), where the oil flows from the flow line 15, the quantity is determined fluid taken from oduktivnogo 2 formation during well exploitation.

The check valve 27 eliminates the drainage of water from the tube 26 into the cavity 28 during the upward movement of the piston 10.

Using the proposed installation of a borehole sucker rod pump with a double-acting pump improves the efficiency of oil production by providing direct control of the quality and quantity of water pumped into the lower layer of the well, as it will increase the amount of water injected and reduce the water content of the oil that is raised to the surface, and information on the actual the amount of injected water allows you to determine the actual flow of fluid from the reservoir and better plan implement and carry out geological and technical measures aimed at increasing oil production.

Claims (1)

  1. A downhole sucker-rod pumping unit with a double-acting pump, comprising a casing with two exposed layers, a pump lowered on a pipe string located in the casing with the formation of an annulus between them, which is separated by a packer located between the opened layers, the pump being equipped with a discharge plunger valve and piston, made with the possibility of reciprocating movement, upper and lower inlet openings with suction valves located above the packer and with respectively above and below the piston, while the pump outlet from above through a pipe string is communicated through a discharge valve with a flow line of the wellhead, and from below through a lower discharge valve with a sub-packer space, while the piston is made free with the possibility of interaction from above with a plunger and limited return translational movement, and the plunger below is equipped with a rod inserted into the piston with the possibility of limited reciprocating movement, characterized in that in the casing additional A tube with a non-return valve is placed, which communicates the pump cavity between the piston and the lower discharge valve with a discharge line through the shut-off element and wellhead measuring equipment.
RU2012100579/06A 2012-01-10 2012-01-10 Pumping rod borehole plant with double-acting pump RU2483228C1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2549660C1 (en) * 2013-11-20 2015-04-27 Открытое акционерное общество "Татнефть" им. В.Д. Шашина System and method of operation of oil field areas with high watercut

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5497832A (en) * 1994-08-05 1996-03-12 Texaco Inc. Dual action pumping system
RU2139417C1 (en) * 1998-04-07 1999-10-10 Юдин Евгений Яковлевич Oil production method
US6202744B1 (en) * 1997-11-07 2001-03-20 Baker Hughes Incorporated Oil separation and pumping system and apparatus
RU2238443C1 (en) * 2003-12-30 2004-10-20 Дроздов Александр Николаевич Method for extracting oil and pump-ejector system for its realization
RU2364708C1 (en) * 2007-12-26 2009-08-20 Открытое акционерное общество "Татнефть" им. В.Д. Шашина Unit borehole rod pumping with double-acting pump

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5497832A (en) * 1994-08-05 1996-03-12 Texaco Inc. Dual action pumping system
US6202744B1 (en) * 1997-11-07 2001-03-20 Baker Hughes Incorporated Oil separation and pumping system and apparatus
RU2139417C1 (en) * 1998-04-07 1999-10-10 Юдин Евгений Яковлевич Oil production method
RU2238443C1 (en) * 2003-12-30 2004-10-20 Дроздов Александр Николаевич Method for extracting oil and pump-ejector system for its realization
RU2364708C1 (en) * 2007-12-26 2009-08-20 Открытое акционерное общество "Татнефть" им. В.Д. Шашина Unit borehole rod pumping with double-acting pump

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2549660C1 (en) * 2013-11-20 2015-04-27 Открытое акционерное общество "Татнефть" им. В.Д. Шашина System and method of operation of oil field areas with high watercut

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