CN221144393U

CN221144393U - Eccentric one-way valve and water shutoff oil production pipe column

Info

Publication number: CN221144393U
Application number: CN202322872597.6U
Authority: CN
Inventors: 孙同明; 张利乐; 贾喻博; 王东峰; 王端哲; 马荣超
Original assignee: China Petroleum and Chemical Corp; Sinopec Henan Oilfield Branch Co
Current assignee: China Petroleum and Chemical Corp; Sinopec Henan Oilfield Branch Co
Priority date: 2023-10-25
Filing date: 2023-10-25
Publication date: 2024-06-14
Anticipated expiration: 2033-10-25

Abstract

The utility model belongs to the technical field of oil extraction engineering, and particularly relates to an eccentric one-way valve and a water shutoff oil extraction pipe column. The water shutoff oil production pipe column comprises a water shutoff pipe column and an oil production pipe column penetrating through the water shutoff pipe column, the water shutoff pipe column comprises a packer, one end far away from the packer is further provided with an eccentric one-way valve, the eccentric one-way valve comprises a valve main body and a bypass structure, the bypass structure comprises a bypass valve body and a bypass flow channel arranged on the bypass valve body, the bypass valve body is fixedly arranged on the periphery of the valve main body, an overflow hole is arranged on the side wall of the valve main body, the overflow hole is mutually communicated with the bypass flow channel, and a channel port of one end far away from the overflow hole of the bypass flow channel is downward. An eccentric one-way valve is arranged at one end far away from the packer, and stratum fluid can enter the water plugging pipe column through the eccentric one-way valve during oil extraction operation; during cleaning operation, the eccentric one-way valve seals the bypass flow passage, so that the hot cleaning wax fluid cannot enter the stratum, and the problem of leakage of the hot cleaning wax fluid is solved.

Description

Eccentric one-way valve and water shutoff oil production pipe column

Technical Field

The utility model belongs to the technical field of oil extraction engineering, and particularly relates to an eccentric one-way valve and a water shutoff oil extraction pipe column.

Background

The oil field enters middle and later-stage development, the too early water breakthrough or excessive water outflow of an oil layer can bring serious influence to the development work of the oil field, if the water shutoff operation is not carried out in time, the oil field can not only form partial dead oil areas, shorten the service life of the oil well, but also use the oil well to stop production when serious, and the comprehensive development benefit of the oil field is influenced. The water plugging operation can reduce the water yield of the oil well, reduce the damage caused by water breakthrough of the oil well and improve the final recovery ratio of the oil field. The mechanical water shutoff is realized by plugging the high-water-content layer by using the packer and the corresponding packer water shutoff process pipe column so as to achieve the effect of water shutoff and precipitation.

At present, the more popular mechanical water shutoff modes are upper and lower seal production, middle seal production at two ends and middle seal production at two ends. The mechanical water shutoff process for sealing the upper water outlet interval, namely the exploitation of the lower interval is implemented by mainly adopting two modes of 'Y211-114 packer + oil pump' and 'Y445-114 packer + Y341-114 packer double-sealing releasing'. The water plugging process of 'Y445-114 packer + Y341-114 packer double-sealing release' is adopted, oil pipes and sleeves are communicated, and hot washing paraffin removal can be realized, but the method is only suitable for oil wells with high stratum pressure and sufficient liquid supply capacity, and for oil wells with large span of plugging layers and exploitation layers and low exploitation layer pressure, hot washing liquid is easy to leak out and enter stratum during hot washing paraffin removal, so that oil layer pollution is caused, and productivity is reduced; in addition, the diameter of the packer in the mode is 50mm, the maximum outer diameter of an oil pipe and an oil well pump which are commonly used for a production string is 89mm, the oil well pump cannot go down to an oil layer through the packer, the running depth of the oil well pump is limited, and the productivity of the oil well is affected. The Y211-114 packer and the oil pump are adopted to block water, the oil pump can be lowered to the upper part of an oil layer to the greatest extent, the productivity of the oil well is not affected, but the oil pipe is not communicated with the sleeve, for the oil well with serious wax precipitation, the hot washing wax removal cannot be implemented, frequent maintenance operation is caused due to the wax precipitation of the oil well in the lifting process, and the oil well has low oil extraction time rate.

The Chinese patent utility model with the authority bulletin number of CN213331010U and the authority bulletin day of 2021, 6 and 1 discloses a water plugging pipe column for a fisheable oil extraction process, which comprises a Y445-150 packer, an oil pipe and a Y221-150 packer which are sequentially connected in series from top to bottom, wherein an oil pump is connected below the oil pipe, and the water plugging pipe column for the fisheable oil extraction process provided by the scheme has a larger drift diameter, so that the oil pump can be plugged into an oil layer through the packer, a pump pipe can be started under the condition that the water plugging pipe column is not started, the problem of capacity reduction caused by large span of a plugging layer and an extraction layer is solved to a certain extent, but the problem of oil layer pollution caused by easy leakage of hot washing liquid in the hot washing wax cleaning operation is not solved.

The Chinese patent of the utility model with the grant bulletin number CN2725516Y and the grant bulletin date of 2005, 9 and 14 discloses a eccentric hole check valve which mainly comprises a valve ball, a ball seat, a main body and the like. Three uniformly distributed eccentric holes are arranged in the main body, one eccentric hole is used for the liquid passing through the lower mining layer, and ball seats are arranged in the other two eccentric holes. According to the scheme, the water plugging pipe column can be communicated with the oil jacket in the well descending process, and the packer is prevented from being set midway; the well killing operation can be realized, and the pollution of well flushing operation to an oil layer is prevented. According to analysis, the offset hole is in a Z-shaped structure, so that impurities such as silt and the like in the oil jacket are accumulated in the offset hole after a period of use to easily block the offset hole, and further the service life of the pipe column is easy to be short.

Disclosure of utility model

The utility model aims to provide an eccentric one-way valve so as to solve the problem that the service life of a pipe column is short due to the fact that the existing eccentric one-way valve is easy to block; the utility model also aims to provide a water shutoff oil production pipe column so as to solve the problem of serious fluid leakage during hot washing and paraffin removal of the existing oil production water shutoff pipe column.

In order to achieve the above purpose, the eccentric one-way valve in the utility model adopts the following technical scheme:

The eccentric check valve comprises a valve body and a bypass structure, wherein the bypass structure comprises a bypass valve body and a bypass flow passage arranged on the bypass valve body, the bypass valve body is fixedly arranged on the periphery of the valve body, an overflow hole is formed in the side wall of the valve body, the overflow hole is communicated with the bypass flow passage, and a passage opening at one end of the bypass flow passage, far away from the overflow hole, is downward.

The beneficial effects of the technical scheme are that: according to the utility model, the bypass valve body is arranged on the periphery of the valve body, the bypass flow passage arranged on the bypass valve body is communicated with the overflow hole on the side wall of the valve body, and the bypass flow passage is far away from the overflow hole, so that the extending direction of the passage hole is consistent with the flowing direction of oil, the flowing resistance of the oil in the bypass flow passage is reduced, the structure of the bypass flow passage in the prior art is simplified as a whole, sediment is not easy to form in the bypass flow passage, the blocking possibility of the eccentric one-way valve is reduced, the sand buried valve ball can be prevented, and the service life of the pipe column is prolonged.

Further, the center axis of the passage opening of the bypass flow passage at the end far from the flow passage hole is parallel to the center axis of the valve body.

The beneficial effects of the technical scheme are that: by the arrangement, the structure of the bypass flow passage in the prior art is simplified, so that sediment is not easy to form in the bypass flow passage, the possibility of blocking the eccentric one-way valve is reduced, the sand-buried valve ball can be prevented, and the service life of the pipe column is prolonged.

Further, a ball seat and a valve ball are arranged in the bypass flow passage, and the ball seat is connected with the valve body and the bypass valve body through threads.

The beneficial effects of the technical scheme are that: the ball seat is connected with the valve body and the bypass valve body through the threads, so that the connection is simple and reliable, and the assembly and the disassembly are convenient; through set up the valve ball in the bypass runner for the valve ball combines pressure variation and controls the break-make of bypass runner according to the demand of well flushing operation and production operation, thereby guarantees when well flushing operation, and paraffin removal fluid does not get into the stratum and causes the pollution.

Further, the outer diameter of the valve ball is larger than the aperture of the overflow hole.

The beneficial effects of the technical scheme are that: by the arrangement, the valve ball can be effectively ensured to be positioned in the bypass flow passage, and the valve ball is prevented from entering the valve main body.

In order to achieve the purpose, the water shutoff oil production pipe column adopts the following technical scheme:

The water shutoff oil production pipe column comprises a water shutoff pipe column and an oil production pipe column penetrating through the water shutoff pipe column, wherein the water shutoff pipe column comprises a packer which is arranged in series, one end of the water shutoff pipe column away from the packer is further provided with an eccentric one-way valve, the eccentric one-way valve comprises a valve body and a bypass structure, the bypass structure comprises a bypass valve body and a bypass runner which is arranged on the bypass valve body, the bypass valve body is fixedly arranged on the periphery of the valve body, an overflow hole is formed in the side wall of the valve body, the overflow hole is mutually communicated with the bypass runner, and the bypass runner is away from a channel opening at one end of the overflow hole.

The beneficial effects of the technical scheme are that: according to the utility model, the prior art is improved, the eccentric one-way valve is further arranged at one end of the water shutoff pipe column far away from the packer, the bypass valve body of the eccentric one-way valve is arranged on the periphery of the valve body, the bypass flow passage arranged on the bypass valve body is communicated with the overflow hole on the side wall of the valve body, and the bypass flow passage is arranged downwards far away from the passage hole, so that the extending direction of the passage hole is consistent with the flowing direction of oil, the flowing resistance of the oil in the bypass flow passage is reduced, the structure of the bypass flow passage in the prior art is simplified as a whole, sediment is not easy to form in the bypass flow passage, the possibility of blocking the eccentric one-way valve is reduced, the sand is prevented from burying a valve ball, and the service life of the pipe column is prolonged.

Further, the oil production pipe column comprises a first oil pipe and a second oil pipe which are connected with each other and have different outer diameters, the second oil pipe is arranged in the packer in a penetrating mode, and one end, far away from the packer, of the second oil pipe is connected with the oil pump.

The beneficial effects of the technical scheme are that: by means of the arrangement, the second oil pipe and the oil pump can smoothly pass through the packer through the oil pipe with the variable diameter, so that the oil pump is closer to the perforation layer, and the stability of the productivity of oil extraction operation under the condition that the span of the plugging layer and the perforation layer is large is effectively met.

Further, the outer diameter of the second oil pipe is not greater than the outer diameter of the first oil pipe and not greater than the inner diameter of the packer.

The beneficial effects of the technical scheme are that: through the arrangement of the oil pipes with variable diameters, the oil pump and the second oil pipe can smoothly pass through the packer to be closer to the perforation layer, the outer diameter of the first oil pipe is larger than that of the second oil pipe, the oil outlet efficiency can be improved, and therefore the oil extraction time rate is effectively guaranteed.

Drawings

FIG. 1 is a schematic diagram of a water-plugging production string according to the present utility model;

FIG. 2 is a schematic diagram of the eccentric check valve in the present utility model.

In the figure: 1. a first oil pipe; 2. a sucker rod; 3. setting a packer; 4. connecting an oil pipe; 5. a second oil pipe; 6. a lower packer; 7. an oil pump; 8. a sand setting pipe; 9. a screen pipe; 10. a first plug; 11. an eccentric one-way valve; 12. a second plug; 13. a sleeve;

111. A valve body; 112. a bypass valve body; 113. an overflow hole; 114. a valve ball; 115. a ball seat; 116. and a bypass flow passage.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the particular embodiments described herein are illustrative only and are not intended to limit the utility model, i.e., the embodiments described are merely some, but not all, of the embodiments of the utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present utility model.

It is noted that relational terms such as "first" and "second", and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" or the like does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The features and capabilities of the present utility model are described in further detail below in connection with the examples.

Example 1 of a water-plugging tubing string in the present utility model:

As shown in fig. 1, the water shutoff and oil extraction pipe column comprises a water shutoff pipe column and an oil extraction pipe column penetrating the water shutoff pipe column.

The water shutoff tubular column comprises an upper packer 3, a lower packer 6 and a sand setting pipe 8 connected with the lower packer 6 which are sequentially connected to two ends of the connecting oil pipe 4 from top to bottom, and an eccentric one-way valve 11 connected with the sand setting pipe 8 and a second plug 12 arranged on the sand setting pipe 6, wherein the upper packer 3 and the lower packer 6 are in sealing contact with the inner wall of a casing 13, thus a shutoff layer in the casing 13 is formed between the upper packer 3 and the lower packer 6, and a perforation layer is formed between the lower packer 6 and the bottom of the casing 13. In the embodiment, the upper packer 3 adopts a Y445-115 packer, the lower packer 6 adopts a Y221-115 packer, and the inner diameter is 74mm; the connecting oil pipe 4 and the sand setting pipe 8 are oil pipes with the outer diameter phi 89 mm; an eccentric one-way valve 11 is located in the perforation layer.

As shown in fig. 2, the eccentric check valve 11 includes a valve body 111 and a bypass structure including a bypass valve body 112 and a bypass flow passage 116, the bypass valve body 112 being disposed at one side of the outer circumference of the valve body 111 by welding, one end of the valve body 111 having an internal thread for connecting the sand setting pipe 8, and the other end having an external thread for connecting the second plug 12; an overflow hole 113 is formed in one side of the valve main body 111, and a thread groove is formed in the valve main body 111 below the overflow hole 113; the bypass valve body 112 is internally provided with a bypass flow passage 116, the bypass flow passage 116 is provided with an outlet and an inlet, the outlet of the bypass flow passage 116 is overlapped with the overflow hole 113, the plane of the overflow hole 113 is mutually perpendicular to the plane of the inlet of the bypass flow passage 116, the central axis of the inlet of the bypass flow passage 116 is parallel to the central axis of the valve main body 111, and the bypass flow passage 116 is in an inverted L shape, so that sediment is not easy to form in the bypass flow passage, and the possibility of blocking the eccentric one-way valve 11 is reduced; the bypass valve body 112 has an internal thread groove at one end of the bypass flow passage 116 inlet, a ball seat 115 is arranged in the bypass flow passage 116, one end of the ball seat 115 positioned at the bypass flow passage 116 inlet has an internal thread, the ball seat 115 is connected with the bypass valve body 112 and the thread groove of the valve body 111 through threads, and a valve ball 114 is arranged on the end face of one end of the ball seat 115 close to the overflow hole 113. In this embodiment, the bypass flow passage 116 of the eccentric check valve 11 has an inner diameter Φ27mm, the outer diameter of the valve ball 114 has a diameter Φ35mm, the inner diameter of the valve body 111 has a diameter Φ39mm, and the opening pressure of the valve ball 114 is 0.2MP. In the process that the eccentric check valve 11 moves down the well along with the water plugging pipe column, the valve ball 114 is pushed upwards under the action of stratum hydraulic force, so that the valve ball 114 sitting on the ball seat 115 is in an open state, the bypass runner 116 is in an open state, stratum fluid enters the oil pipe, so that the pressure in the oil pipe and the casing pipe is kept stable, and further the advanced setting of the packer is avoided; when the water plugging pipe column is lowered to the designed position, hydraulic pressure is applied to the oil pipe, and when the pressure in the oil pipe is greater than the pressure in the sleeve, the valve ball 114 is seated on the ball seat, so that the bypass flow passage 116 is in a closed state; when the oil pump 7 is in the upstroke, the pressure in the sleeve is larger than the pressure in the oil pipe, the valve ball 114 is separated from the ball seat 115, so that the bypass flow passage 116 is opened, stratum fluid enters the water plugging pipe column through the bypass flow passage 116, and then enters the oil pump 7 through the oil pipe and finally lifts out of the well; in the production process, when the water shutoff oil production pipe column is used for hot washing and paraffin removal, the valve ball 114 is sealed with the ball seat 115 under the action of well washing hydraulic pressure, and the bypass flow passage 116 is in a closed state, so that paraffin removal fluid is prevented from entering a stratum to cause pollution.

As shown in fig. 1, the production string comprises a first oil pipe 1, a second oil pipe 5 and a sucker rod 2 penetrating through the first oil pipe 1 and the second oil pipe 5, which are sequentially connected from top to bottom, an oil pump 7 connected to one end of the second oil pipe 5, a screen pipe 9 sequentially connected to the pump 7, and a first plug 10 arranged on the screen pipe 9, wherein the second oil pipe 5 penetrates through the upper packer 3 and the lower packer 6. In the embodiment, the first oil pipe 1 is an oil pipe with the outer diameter phi 73mm, the second oil 5 pipe is an oil pipe with the outer diameter phi 60.3mm, and the outer diameter of the coupling is 71mm; the maximum outer diameter of the oil pump 7, namely the outer diameter of the fixed valve assembly and the connecting collar of the oil pump is 70mm.

In this embodiment, since the maximum outer diameter of the oil pump 7 is 70mm, the outer diameter of the second oil pipe 5 penetrating through the upper packer 3 and the lower packer 6 is 60.3mm, and the outer diameter of the sand setting pipe 8 is Φ89mm, the oil pump 7, the screen pipe 9 and the first plug 10 can be arranged in the sand setting pipe 8. Therefore, the one-way plugging of the plugging layer and the perforation layer is realized through the water plugging pipe column, namely, stratum crude oil can enter the inside of the water plugging pipe column through the eccentric one-way valve and is lifted to the ground through the oil production pipe column, and normal production operation is realized.

In this embodiment, the first oil pipe 1 is connected with one end of the second oil pipe 5, and the oil pump 7 passes through the upper packer 3 and the lower packer 6 to reach the designed position after being connected with the second oil pipe 5, so as to form a production string. Because the internal diameters of the upper packer 6 and the lower packer 6 are 74mm, compared with the prior art, the internal diameter of the packer is larger, the oil production pipe column can smoothly pass through the packer to reach the perforation layer, so that the oil well pump is closer to the perforation layer, and the stability of the productivity of oil production operation under the condition of large span of the plugging layer and the perforation layer is effectively met.

With the structure of the water-plugging oil production pipe column, the water-plugging oil production pipe column mainly comprises:

(1) Pigging, scraping and pipe column pressure testing: the well is cleared, scraped and washed before the tubular column is put into the well, so that the smoothness of the well is ensured, and the inside of the well is free of greasy dirt and impurities; testing the pressure of the pipe column;

(2) Assembling and blanking a water plugging tubular column: assembling a water plugging pipe column according to design requirements, determining the length of a connecting oil pipe according to the length of a plugging section required, conveying the connecting oil pipe to a design position by using the oil pipe, and performing backwashing operation;

(3) Setting down the packer: lifting the pipe column, rotating clockwise for more than one circle, lowering while rotating, and pressurizing to set the lower packer;

(4) Setting an upper packer: putting phi 40 steel balls into a tubular column with load (ensuring the setting of a lower packer), pressing the tubular column, and when the pressure reaches 20MPa, finishing setting by a setting tool, and continuing pressing until the pressure reaches 24MPa, and separating by the setting tool; if normal open is not realized, lifting the pipe column for open under the pressure of 24MPa, and then lifting the seal conveying tool;

(5) Assembling and setting a production string: assembling a production string according to design requirements, and running the production string, wherein the running depth of the first oil pipe is 20 meters from a wellhead to an upper packer;

(6) Salvaging: and (3) connecting a special fishing tool with the lower to upper packer by using an oil pipe, colliding and butting with the fish roof, and lifting and unsealing after butting.

Example 2 of the water-plugging tubing string in the present utility model:

In embodiment 1 of the water shutoff oil production string, the bypass structure includes a bypass valve body and a bypass flow passage provided in the bypass valve body, the bypass valve body being fixedly provided on an outer periphery of the valve body. In this embodiment, the bypass structure is built-in the valve main body to can reduce the external diameter of eccentric check valve, reduce the occupation to the interior space of water shutoff tubular column.

Example 3 of the water-plugging tubing string in the present utility model:

In example 1 of the water-plugging string, the ball seat is threadably connected to the valve body and the bypass valve body. In the embodiment, the ball valve is fixedly connected with the valve main body and the bypass valve body in a welding mode; in other embodiments, the ball seat contacts and is in sealing engagement with the valve body and the bypass valve face, and limiting fixation of the ball seat is achieved by arranging a compression ring at one end of the inlet of the ball seat bypass flow channel.

Embodiments of the eccentric check valve in the present utility model:

The eccentric check valve in the present utility model has the same structure as the eccentric check valve in any one of embodiments 1 to 3 of the water shutoff oil production string, and will not be described here again.

The above description is only a preferred embodiment of the present utility model, and the patent protection scope of the present utility model is defined by the claims, and all equivalent structural changes made by the specification and the drawings of the present utility model should be included in the protection scope of the present utility model.

Claims

1. Eccentric check valve, including valve main part and bypass structure, its characterized in that: the bypass structure comprises a bypass valve body and a bypass flow passage arranged on the bypass valve body, the bypass valve body is fixedly arranged on the periphery of the valve body, an overflow hole is formed in the side wall of the valve body, the overflow hole is communicated with the bypass flow passage, and a passage opening of one end of the bypass flow passage, which is far away from the overflow hole, is downward.

2. The eccentric check valve as in claim 1, wherein: the center axis of the passage opening of the end of the bypass flow passage far from the overflow hole is parallel to the center axis of the valve main body.

3. The eccentric check valve according to claim 1 or 2, wherein: the bypass flow passage is internally provided with a ball seat and a valve ball, and the ball seat is connected with the valve body and the bypass valve body through threads.

4. An eccentric check valve according to claim 3, wherein: the outer diameter of the valve ball is larger than the aperture of the overflow hole.

5. The water shutoff oil production pipe column comprises a water shutoff pipe column and an oil production pipe column penetrating through the water shutoff pipe column, wherein the water shutoff pipe column comprises a packer arranged in series, and is characterized in that: the one end that the packer was kept away from to the water shutoff tubular column still is provided with eccentric check valve, and eccentric check valve includes valve main part and bypass structure, bypass structure includes the bypass valve body and locates the bypass runner of bypass valve body, the bypass valve body set firmly in on the periphery of valve main part, have the overflow hole on the lateral wall of valve main part, the overflow hole with the bypass runner communicates each other, the bypass runner is kept away from the passway of the one end of overflow hole is downwards.

6. The water-plugging tubing string of claim 5, wherein: the center axis of the passage opening of the end of the bypass flow passage far from the overflow hole is parallel to the center axis of the valve main body.

7. A water-plugging tubing string as defined in claim 5 or 6, wherein: the bypass flow passage is internally provided with a ball seat and a valve ball, and the ball seat is connected with the valve body and the bypass valve body through threads.

8. The water-plugging tubing string of claim 7, wherein: the outer diameter of the valve ball is larger than the aperture of the overflow hole.

9. A water-plugging tubing string as defined in claim 5 or 6, wherein: the oil extraction pipe column comprises a first oil pipe and a second oil pipe which are connected with each other and have different outer diameters, the second oil pipe is arranged in the packer in a penetrating mode, and one end, far away from the packer, of the second oil pipe is connected with the oil pump.

10. The water-plugging tubing string of claim 9, wherein: the outer diameter of the second oil pipe is not larger than the outer diameter of the first oil pipe and not larger than the inner diameter of the packer.