CN211851686U - Find stifled water production pipe - Google Patents

Abstract

The utility model relates to a look for stifled water oil production pipe column, including the production tubular column and the match production tubular column of vertical setting and upper and lower butt joint, the production tubular column includes upper and lower fixed oil pipe and secondary butt joint ware, is equipped with the spacing bulge loop that a diameter shrinks at oil pipe's upper end inner wall, is equipped with a rod-type pump at the oil pipe endotheca, and the upper end outer wall cover of rod-type pump is equipped with the rigid support sealing ring, and the internal diameter that the external diameter of rigid support sealing ring is greater than spacing bulge loop is less than oil pipe's internal diameter. The production allocation tubular column comprises a releasing butt joint device and a plurality of production allocation assemblies which are sequentially connected from top to bottom, and the secondary butt joint device can be in butt joint with the releasing butt joint device. The utility model discloses a look for stifled water oil production pipe simple structure can accurately look for stifled water, and need not to play out the tubular column is whole when needing to examine the pump operation, easy operation has reduced work load and running cost.

Description

Find stifled water production pipe

Technical Field

The utility model relates to a stifled water field is looked for in oil recovery, especially relates to a look for stifled water oil production pipe.

Background

In the middle and later exploitation periods of the offshore river oil field, most oil wells enter a high water content period, and water exploration and water plugging become important means for improving the productivity of the oil wells. The general methods currently employed are: firstly, the original well production pipe column is taken out and a test tool is put in to carry out production profile test, the high water-cut interval of the oil well is determined, then the measure operation pipe column is put in to block the water-cut interval, and then the production pipe column is put in to recover production. The water finding and blocking method has the advantages of complex process and high construction cost.

Aiming at the development of the water finding and plugging pipe column technology in recent years, at present, hydraulic control type water finding and plugging, cable-free type water finding and plugging and mechanical water finding and plugging are mainly adopted, wherein hydraulic control type water finding and plugging mainly utilizes hydraulic control to change a switch, but the switch change is greatly influenced by formation pressure, oil property, oil reservoir condition and working fluid level, so that the problem of inaccurate water finding often occurs; due to the complexity of underground working conditions, the service life of an underground tool battery and other factors, the cableless water finding and plugging cannot be carried out due to signal loss; in part of mechanical water finding and blocking technologies, tools such as a measuring and regulating instrument need to be put in to open and close the production allocator to carry out oil production, and the work is complicated.

In addition, in the existing water finding and plugging pipe column, if maintenance operations such as pump detection and the like need to be carried out, the pipe column is completely lifted out, the workload is large, and the cost is high. The main reason is that a tubular pump or an electric submersible pump is generally adopted in the existing water plugging tubular column, for the tubular pump, a pump cylinder is sleeved in an oil pipe, the lower end of the pump cylinder is fixedly connected (screwed) with the oil pipe, a piston in the pump cylinder is fixed with a sucker rod when in use, and the lower end of the oil pipe of the whole tubular pump is fixed with a lower tubular column, so that the tubular pump and the tubular column fixed below the tubular pump are required to be completely lifted out when the pump needs to be checked, and the operation is complicated; for the electric submersible pump, the lower end of the electric submersible pump unit is directly fixed (screwed) with the lower pipe column, so that the electric submersible pump unit and the pipe column fixed below are required to be completely lifted out when the pump needs to be checked, and the workload is increased.

Therefore, the inventor provides a water plugging oil production pipe column by virtue of experience and practice of related industries for many years so as to overcome the defects in the prior art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a look for stifled water oil production pipe, simple structure can accurately look for stifled water, and need not to play out the tubular column is whole when needing to examine the pump operation, easy operation has reduced work load and operating cost.

The utility model aims at realizing the purpose, and provides a water finding and blocking oil production pipe column, which comprises a production pipe column and a production allocation pipe column which are vertically arranged and are butted up and down; the production pipe column comprises an oil pipe and a secondary butt joint device which are fixed up and down, a limiting convex ring with a reduced diameter is arranged on the inner wall of the upper end of the oil pipe, a rod pump is sleeved in the oil pipe, a rigid supporting sealing ring is sleeved on the outer wall of the upper end of the rod pump, and the outer diameter of the rigid supporting sealing ring is larger than the inner diameter of the limiting convex ring and smaller than the inner diameter of the oil pipe; the production allocation tubular column comprises a releasing butt joint device and a plurality of production allocation assemblies which are sequentially connected from top to bottom, and the secondary butt joint device can be in butt joint with the releasing butt joint device.

In a preferred embodiment of the present invention, the inner wall of the upper end of the limit protruding ring is a conical surface that gradually expands upward, and the outer wall of the rigid support sealing ring is a conical surface that gradually shrinks downward.

The utility model discloses an in a preferred embodiment, still the cover is equipped with fixed cover on the outer wall of rod-type pump and below that is located the rigid support sealing ring, and the upper end of fixed cover is equipped with a plurality of claw springs along its circumference interval, is equipped with ring groove at the middle part inner wall of spacing bulge loop, and claw spring can block to establish in ring groove.

The utility model discloses an in a preferred embodiment, the upper portion pipe wall of fixed cover is equipped with the groove that passes through that many intervals set up along its circumference ring, and the groove that passes through upwards extends to the top of fixed cover, and the claw spring of formation is outwards established suddenly to fixed cover pipe wall part elasticity between two adjacent grooves that pass through, and the claw spring upper end outside is equipped with outside bellied convex bead, and convex bead can block to establish in ring groove.

The utility model discloses an in a preferred embodiment, all be equipped with the transition inclined plane on the top surface of convex bead and bottom surface, all be equipped with the transition conical surface on ring groove's last cell wall and lower cell wall.

In a preferred embodiment of the present invention, a rubber sealing ring is sleeved on the outer wall of the rod pump and below the rigid support sealing ring.

The utility model discloses an among the preferred embodiment, oil pipe includes from last oil pipe, pump seat pipe and lower oil pipe down fixed in proper order, and spacing bulge loop is established on the pump seat pipe, lower oil pipe and secondary butt joint ware fixed connection.

The utility model discloses an among the preferred embodiment, the rod-type pump includes pump barrel, plunger and pull rod, and the plunger can the cover establish with axially sliding in the pump barrel, is equipped with the standing valve at the lower extreme of pump barrel, is equipped with down traveling valve and upper traveling valve respectively in the lower extreme and the upper end of plunger, and the lower extreme of pull rod and the upper end fixed connection of plunger are equipped with the oil outlet at the upper end lateral wall of pump barrel.

In a preferred embodiment of the present invention, the pump barrel comprises an upper pump barrel, a middle pump barrel and a lower pump barrel which are sequentially fixed from top to bottom, the oil outlet is arranged on the upper end side wall of the upper pump barrel, the fixed valve is arranged at the bottom end of the lower pump barrel, and the plunger is positioned in the lower pump barrel; the inner diameter of the middle pump cylinder is smaller than that of the upper pump cylinder and that of the lower pump cylinder, and the inner diameter of the middle pump cylinder is larger than that of the pull rod and smaller than that of the plunger.

In a preferred embodiment of the present invention, a sieve tube is disposed between the oil pipe and the secondary docking unit.

In a preferred embodiment of the present invention, an oil pipe anchor is further provided between the releasing butt-joint device and the production allocation assembly.

In a preferred embodiment of the utility model, each production allocation component comprises a production allocation device and a packer arranged above the production allocation device, the releasing butt joint device is electrically connected with the plurality of production allocation devices through production allocation cables, and the bottom end of the production allocation pipe column is also connected with a plug; and a butt joint cable is arranged on the outer wall of the production pipe column, and the lower end of the butt joint cable is electrically connected with the secondary butt joint device.

From top to the utility model provides a tubular column can control the switching of joining in marriage the production subassembly through the butt joint cooperation of secondary butt joint ware and release butt joint ware, and then can carry out effectual interval to the oil recovery well of multilayer position development and separate, realizes the combination exploitation in arbitrary interval, can carry out water exploration water shutoff, easy operation more accurately. And simultaneously, the utility model discloses in utilize the rod-type pump to recover oil, the rod-type pump can be repeated down, and do not influence and look for the operation of blocking up water, moreover because rod-type pump and oil pipe are not fixed connection, but realize that the supporting is spacing through spacing bulge loop, consequently, only need when examining the pump operation utilize the sucker rod with the rod-type pump alone play out can, and need not play out parts such as oil pipe and secondary butt connector in the production string, make the operation more convenient, alleviateed work load.

Furthermore, the utility model provides a rod-type pump utilizes spacing bulge loop to carry out the supporting spacing to its top, and the pump barrel majority of rod-type pump hangs in the below of spacing bulge loop, can not receive the action of gravity of oil pipe or sucker rod basically, consequently can avoid producing the crooked condition of atress at the butt joint in-process, has prevented that the pump barrel from appearing warping.

Drawings

The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention. Wherein:

FIG. 1: does the utility model provides a look for the structural schematic diagram of stifled water production pipe column.

FIG. 2: do the utility model provides an oil pipe and rod pump's schematic structure.

The reference numbers illustrate:

1. producing a tubular string;

11. an oil pipe; 111. feeding an oil pipe; 112. a pump mount tube; 1121. a limit convex ring; 113. discharging an oil pipe;

12. a rod pump; 121. an upper pump barrel; 1211. an oil outlet hole; 122. a middle pump barrel; 123. a lower pump barrel; 1231. a fixed valve; 124. a plunger; 1241. a downstream valve; 1242. an upstream valve; 125. a pull rod; 126. a rigid support seal ring; 127. fixing a sleeve; 1271. a pawl spring; 128. a rubber seal ring;

13. a screen pipe; 14. a secondary butt-joint device; 15. butting the cables;

2. a production allocation tubular column;

21. a releasing butt-joint device; 22. a production allocation cable; 23. tubing anchor; 24. a production allocation component; 241. a packer; 242. a production allocator; 25. plugging with a thread;

3. a sleeve; 4. an oil layer section is applied; 5. a lower oil interval section; 6. a Christmas tree.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in fig. 1 and fig. 2, the embodiment provides a find water shutoff pipe column, which includes a vertically arranged and vertically butted production pipe column 1 and a production allocation pipe column 2, the production pipe column 1 includes an oil pipe 11 and a secondary butting device 14 which are fixed vertically, a diameter-reduced limit convex ring 1121 is arranged on an inner wall of an upper end of the oil pipe 11, a rod pump 12 is sleeved in the oil pipe 11, a rigid support sealing ring 126 is sleeved on an outer wall of an upper end of the rod pump 12, and an inner diameter of the rigid support sealing ring 126, which is larger than the inner diameter of the limit convex ring 1121, is smaller than an inner diameter of the oil pipe. The production allocation pipe column 2 comprises a releasing butt-joint device 21 and a plurality of production allocation assemblies 24 which are sequentially connected from top to bottom, and the secondary butt-joint device 14 can be butted with the releasing butt-joint device 21.

Specifically, the plurality of production allocation assemblies 24 correspond to different production oil intervals respectively, and the number of the production allocation assemblies is the same as the number of the oil intervals into which the oil layer needs to be divided, for example, when the oil layer is divided into two layers, i.e., an upper oil interval 4 and a lower oil interval 5, as shown in fig. 1, two production allocation assemblies 24 are provided. The secondary butt joint device 14 and the releasing butt joint device 21 are connecting tools of the production string 1 and the production allocation string 2, and after the two are in butt joint, the connected cables are in signal communication, so that the opening and closing of the plurality of production allocation assemblies 24 can be controlled respectively, and water finding and blocking and oil extraction operations are completed.

Wherein, join in marriage production string 2 and mainly be responsible for looking for water shutoff work, open different oil interval sections through the switching of controlling a plurality of components 24 of joining in marriage, according to well head sample chemical examination, can detect production data such as the moisture of opening the oil interval section to this judges whether the oil interval section of opening is high water-bearing stratum, thereby confirms the position that need close and the oil interval section of opening, realizes the high water-bearing oil reservoir of shutoff, exploits the low water-bearing oil reservoir. The production string 1 is mainly responsible for butt joint with the production allocation string 2, signal transmission and oil extraction. After the production allocation assembly 24 at the designated position is butted and opened, the rod pump 12 can be used for oil production. The specific structures of secondary dockee 14 and release dockee 21 are prior art and will not be described herein.

In this embodiment, through the butt joint cooperation of the secondary butt joint device 14 and the releasing butt joint device 21, the opening and closing of the production allocation assembly 24 can be controlled, so that the effective interval separation can be performed on the oil production well developed in multiple layers, the combined exploitation of any interval can be realized, the water exploration and water shutoff can be performed more accurately, and the operation is simple. Meanwhile, in the embodiment, the rod pump 12 is used for oil extraction, the rod pump 12 can be repeatedly lifted, the water finding and blocking operation is not affected, and the rod pump 12 and the oil pipe 11 are not fixedly connected but are supported and limited by the limiting convex ring 1121, so that the rod pump 12 only needs to be lifted out by using a sucker rod when the pump detection operation is needed, and the oil pipe 11, the secondary butt joint device 14 and other components in the production string 1 do not need to be lifted out, so that the operation is more convenient, and the workload is reduced.

In addition, the rod pump 12 in this embodiment utilizes the limit convex ring 1121 to support and limit the top of the rod pump, and most of the pump cylinder of the rod pump 12 is suspended below the limit convex ring 1121, so that the gravity action of the oil pipe 11 or the sucker rod is basically avoided, and therefore, the situation of stress bending can be avoided in the butt joint process, and the deformation of the pump cylinder is prevented.

In a specific implementation manner, in order to facilitate the rigid support sealing ring 126 to be able to closely fit with the convex position-limiting ring 1121, an inner wall of an upper end of the convex position-limiting ring 1121 is a tapered surface that is gradually enlarged upward, and an outer wall of the rigid support sealing ring 126 is a tapered surface that is gradually reduced downward. The rigid support seal ring 126 and the retainer ring 1121 are made of an alloy, and both can form a metal seal, and provide a certain sealing property to an annular space between a pump cylinder and the oil pipe 11, which will be described below.

Thus, after the rod pump 12 is inserted into the oil pipe 11, the conical surface of the rigid support sealing ring 126 can abut against the conical surface of the limit convex ring 1121, and a certain friction force exists between the two conical surfaces, so that the rod pump 12 cannot be separated from the limit convex ring 1121 under a certain hydraulic pressure during oil extraction.

In practical applications, in order to further ensure that the rod pump 12 will not be separated from the limit convex ring 1121 under a large hydraulic pressure during oil extraction, a fixing sleeve 127 is further sleeved on the outer wall of the rod pump 12 and below the rigid support sealing ring, a plurality of claw springs 1271 are arranged at intervals along the circumferential direction of the upper end of the fixing sleeve 127, an annular slot (not shown in fig. 2) is arranged on the inner wall of the middle part of the limit convex ring 1121, and the claw springs 1271 can be clamped in the annular slot. Therefore, the clamping fixation between the rod pump 12 and the oil pipe 11 can be ensured through the matching of the claw spring 1271 and the annular clamping groove, and the annular clamping groove can be elastically separated through the claw spring 1271 when the rod pump 12 is singly lifted out when the pump needs to be checked, so that the separation between the rod pump 12 and the oil pipe 11 can be conveniently realized.

In detail, the upper wall of the fixing sleeve 127 is circumferentially provided with a plurality of through grooves arranged at intervals along the circumference, the through grooves extend upwards to the top of the fixing sleeve 127, the wall part of the fixing sleeve 127 between two adjacent through grooves is elastically and outwards protruded to form a pawl spring 1271, and the outer side of the upper end of the pawl spring 1271 is provided with an outwardly convex arc-shaped rib (not shown in fig. 2), which can be clamped in the annular clamping groove. The linear direction of the through groove is parallel to the axial direction of the fixing sleeve 127, the lower end of the fixing sleeve 127 is fixedly connected with the outer wall of the pump cylinder, and the number of the claw springs 1271 is determined according to actual needs. Of course, the pawl spring 1271 may take other forms and the present embodiment is illustrative only.

In practical application, in order to ensure that the circular arc-shaped convex edge can be smoothly clamped into and separated from the annular clamping groove, transition inclined planes are arranged on the top surface and the bottom surface of the circular arc-shaped convex edge, and transition conical surfaces are arranged on the upper groove wall and the lower groove wall of the annular clamping groove. Therefore, the claw spring 1271 can be smoothly clamped into and separated from the annular clamping groove by the mutual matching of the circular-arc-shaped convex ribs and the annular clamping groove, and meanwhile, the transition inclined planes on the circular-arc-shaped convex ribs can ensure that the claw spring 1271 cannot be damaged when the circular-arc-shaped convex ribs are separated from the annular clamping groove.

During oil extraction, the liquid pressure mainly acts on the inner cavity of the pump cylinder, and the force acting on the outer wall of the pump cylinder is relatively small, so that the force acting on the fixing sleeve 127 during oil extraction is not too large, and the rod pump 12 can be ensured not to be separated from the limit convex ring 1121 by utilizing the clamping of the circular-arc-shaped convex edge and the annular clamping groove and the friction force between the conical surface of the rigid support sealing ring 126 and the conical surface of the limit convex ring 1121. When the rod pump 12 is lifted out due to pump inspection, the rod pump 12 is lifted by utilizing the sucker rod, the lifting force is increased by pressurizing at the moment (generally, the force of 3-5 tons is increased), and under the higher pressure, the circular arc-shaped convex edge is separated from the annular clamping groove, so that the rod pump 12 is separated from the oil pipe 11, and the purpose of independently lifting out the rod pump 12 is further achieved.

In order to further ensure the tightness of the annulus between the pump barrel and the tubing 11, as described below, and to avoid leakage of fluid from the annulus during oil production, a rubber sealing ring 128 is fitted around the outer wall of the rod pump 12 below the rigid support sealing ring 126. The rubber sealing ring 128 is located below the fixing sleeve 127, and the outer diameter of the rubber sealing ring 128 is slightly larger than the inner diameter of the limiting convex ring 1121, generally larger than 1mm at most, so as to seal an annular space between the pump cylinder and the oil pipe 11.

Further, for convenience of processing and installation, the oil pipe 11 includes an upper oil pipe 111, a pump seat pipe 112, and a lower oil pipe 113 fixed in sequence from top to bottom, the limit convex ring 1121 is disposed on the pump seat pipe 112, and the lower oil pipe 113 is fixedly connected to the secondary butt connector 14.

Further, as shown in fig. 2, the rod pump 12 includes a pump cylinder, a plunger 124 and a pull rod 125, the plunger 124 is axially slidably disposed in the pump cylinder, a fixed valve 1231 is disposed at the lower end of the pump cylinder, a lower movable valve 1241 and an upper movable valve 1242 are disposed at the lower end and the upper end of the plunger 124, the lower end of the pull rod 125 is fixedly connected to the upper end of the plunger 124, and an oil outlet 1211 is disposed on the upper end of the pump cylinder.

Specifically, for convenience of processing and installation, the pump cylinder includes an upper pump cylinder 121, a middle pump cylinder 122 and a lower pump cylinder 123 which are fixed in sequence from top to bottom, the oil outlet 1211 is formed on the upper end side wall of the upper pump cylinder 121, the fixed valve is formed at the bottom end of the lower pump cylinder 123, and the plunger is located in the lower pump cylinder 123. The inner diameter of the middle cylinder 122 is smaller than the inner diameters of the upper cylinder 121 and the lower cylinder 123, and the inner diameter of the middle cylinder 122 is larger than the pull rod 125 and smaller than the outer diameter of the plunger 124. The outer diameter of the plunger 124 is slightly smaller than the inner diameter of the lower pump cylinder 123, the bottom end of the middle pump cylinder 122 has a certain limiting effect on the plunger, and the rigid support sealing ring 126, the fixed sleeve 127 and the rubber sealing ring 128 are all sleeved on the middle pump cylinder 122.

When in use, the upper end of the pull rod 125 is fixedly connected with the sucker rod, and the working process of the rod pump 12 is as follows: the up stroke, the plunger 124 moves up along with the sucker rod, at this time, the fixed valve 1231 is opened, the downstream movable valve 1241 and the upstream movable valve 1242 are both closed, and the liquid enters the lower inner cavity of the pump cylinder after passing through the fixed valve 1231, so that the liquid pumping is realized. The down stroke and the plunger 124 move downwards along with the sucker rod, at the moment, the fixed valve 1231 is closed, the lower traveling valve 1241 and the upper traveling valve 1242 are both opened, liquid in the inner cavity of the pump cylinder flows out from a liquid outlet hole at the upper end of the plunger 124 after passing through the lower traveling valve 1241 and the upper traveling valve 1242 and enters the inner cavity at the upper part of the pump cylinder, then flows out from an oil outlet at the upper end of the pump cylinder and enters an annular space between the pump cylinder and the upper oil pipe 11, the liquid drainage of the pump is realized by continuous upward movement, and. It should be noted that the specific structures of the fixed valve 1231, the downstream valve 1241 and the upstream valve 1242 are all the prior art, and are not described herein again.

In practice, a screen 13 is provided between tubing 11 and secondary adapter 14 for filtering the well fluid. In order to make the setting of the production string 2 more secure, a tubing anchor 23 is also provided between the release sub 21 and the production assembly 24.

Further, as shown in fig. 1, each production allocation assembly 24 comprises a production allocator 242 and a packer 241 arranged above the production allocator 242, the release dockee 21 is electrically connected with the plurality of production allocators 242 through a production allocation cable 22, and a plug 25 is connected to the bottom end of the production allocation string 2. The outer wall of the production pipe column 1 is provided with a butt joint cable 15, and the lower end of the butt joint cable 15 is electrically connected with the secondary butt joint 14.

Wherein, two adjacent production allocation assemblies 24 are generally connected by a tubing, and the lowermost production allocator 242 is connected to the plug 25 by a tubing. The packer 241 is used to seal the oil jacket annulus and thereby divide the oil formation into multiple oil intervals, where the packer 241 is typically a cable-over packer 241 for the production cable 22 to pass over. The effect of the production allocator 242 is that it can receive ground signals through the production allocation cable 22, and open or close the liquid inlet of the production allocator 242, and the production allocator 242 itself can also monitor the production flow pressure of each oil interval and the oil layer static pressure of the production-stopped oil layer in real time, and can also perform the comprehensive test of the single-layer liquid production and flow pressure (the monitoring and comprehensive test are both functions of the production allocator 242 itself, and are prior art). The distribution cable 22 primarily functions to provide power to each of the distributors 242 and to transmit surface commands. The specific structure of the packer 241 and the production allocator 242 is also prior art and will not be described herein.

In use, the upper end of the docking cable 15 extends out of the wellhead and is connected to a mobile terminal (e.g., a computer) at the surface. The following detailed description is made on the working process of the whole water finding and plugging oil production pipe 11 column, and specifically includes the following steps:

firstly, a production allocation tubular column 2 is put in by using an oil pipe 11 tubular column, at the moment, a liquid inlet hole of each production allocation device 242 is in a closed state, after the production allocation tubular column is put in a specified position, each packer 241 is set by pressing through the oil pipe 11, the pressure of the oil pipe 11 is improved, an anchor shoe of a releasing butt-joint device 21 is expanded and locked on a sleeve 3, an anchor shoe of a tubing anchor 23 is expanded and locked on the sleeve 3, and simultaneously a releasing hand is released, so that the production allocation tubular column 2 is hung in the sleeve 3.

And secondly, the oil outlet pipe 11 pipe column is lifted, the production pipe column 1 is put in, the lower end of the secondary butt-joint device 14 is inserted and butted with the upper end of the releasing butt-joint device 21, the well mouth is set after the butt-joint is finished, and the Christmas tree 6 is installed. After the butt joint is completed, the butt joint cable 15 is connected with the production allocation cable 22, and signal communication is achieved.

Finally, a computer on the ground is connected with the upper end of the butt-joint cable 15, a computer program is used for sending out an instruction, the instruction is transmitted to each production allocator 242 through the production allocation cable 22 to open the liquid inlet hole of the corresponding production allocator 242, and then the corresponding oil layer section is opened, so that the opening and closing of the plurality of production allocators 242 are separately controlled by transmitting the ground instruction through the cable. After the corresponding oil interval is opened, the rod pump 12 can be used for carrying out the layered oil production operation.

During oil extraction, liquid of a corresponding oil layer ascends and sequentially passes through the corresponding production distributor 242, the packer 241 tubing anchor 23, the releasing butt-joint device 21 and the secondary butt-joint device 14, then when the liquid passes through the sieve tube 13, the liquid enters an oil casing annulus between the oil tube 11 and the casing 3 through the sieve tube 13, when the sieve tube 13 is submerged by the liquid in the oil casing annulus, the liquid can continuously ascend and is pumped into a pump cylinder, and then the rod pump 12 works to realize oil extraction.

The water-plugging oil extraction operation of the whole pipe column is adjusted by a ground computer, and the switch of each downhole production allocator 242 can be adjusted at any time by utilizing an uphole electric signal, so that the liquid production amount of any oil interval can be adjusted, the liquid output of an invalid oil interval is closed or reduced, and the yield of a main production layer is further improved. The whole pipe column is easy and convenient to operate, and due to the adoption of cable butt joint, signal transmission is not influenced by formation pressure, oil reservoir conditions and the like, so that accurate transmission of signals is guaranteed, loss is avoided, accurate water finding and plugging are realized, and the oil field has higher ultimate recovery ratio. Meanwhile, when the pump needs to be checked, the rod pump 12 in the production string 1 only needs to be lifted out independently, and the rest parts of the production string 1 do not need to be lifted out, so that the operation is more convenient. In addition, when the cable goes wrong or the oil interval is mined, the whole production pipe column 1 is only required to be lifted out, and the production allocation pipe column 2 does not need to be lifted out to work underground for a long time, so that the equipment and construction cost is reduced.

The above are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention. Any person skilled in the art should also realize that such equivalent changes and modifications can be made without departing from the spirit and principles of the present invention.

Claims (12)

1. A water finding and plugging oil production pipe column is characterized by comprising a production pipe column and a production allocation pipe column which are vertically arranged and are butted up and down;

the production pipe column comprises an oil pipe and a secondary butt joint device which are fixed up and down, a limiting convex ring with a reduced diameter is arranged on the inner wall of the upper end of the oil pipe, a rod pump is sleeved in the oil pipe, a rigid supporting sealing ring is sleeved on the outer wall of the upper end of the rod pump, and the outer diameter of the rigid supporting sealing ring is larger than the inner diameter of the limiting convex ring and smaller than the inner diameter of the oil pipe;

the production allocation tubular column comprises a releasing butt-joint device and a plurality of production allocation assemblies which are sequentially connected from top to bottom, and the secondary butt-joint device can be in butt joint with the releasing butt-joint device.

2. The water shutoff oil production string according to claim 1,

the inner wall of the upper end of the limiting convex ring is a conical surface which is gradually enlarged upwards, and the outer wall of the rigid supporting sealing ring is a conical surface which is gradually reduced downwards.

3. The water shutoff oil production string according to claim 2,

the outer wall of the rod pump is located below the rigid supporting sealing ring, a fixing sleeve is further sleeved on the outer wall of the rod pump, a plurality of claw springs are arranged at intervals on the upper end of the fixing sleeve along the circumferential direction of the fixing sleeve, an annular clamping groove is formed in the inner wall of the middle of the limiting convex ring, and the claw springs can be clamped in the annular clamping groove.

4. The water shutoff oil production string according to claim 3,

the upper portion pipe wall of fixed cover is equipped with the groove that passes through that many intervals set up along its circumference ring, pass through the groove and upwards extend to the top of fixed cover, the fixed cover pipe wall part elasticity between two adjacent grooves that pass through outwards establish suddenly and form the claw spring, the claw spring upper end outside is equipped with outside bellied convex bead, convex bead can block and establish in the ring channel.

5. The water shutoff oil production string according to claim 4,

transition inclined planes are arranged on the top surface and the bottom surface of the circular arc-shaped convex edge, and transition conical surfaces are arranged on the upper groove wall and the lower groove wall of the annular clamping groove.

6. The water shutoff oil production string according to claim 2,

and a rubber sealing ring is sleeved on the outer wall of the rod pump and positioned below the rigid supporting sealing ring.

7. The water shutoff oil production string according to claim 1,

the oil pipe comprises an upper oil pipe, a pump seat pipe and a lower oil pipe which are sequentially fixed from top to bottom, the limiting convex ring is arranged on the pump seat pipe, and the lower oil pipe is fixedly connected with the secondary butt joint device.

8. The water shutoff oil production string according to claim 1,

the rod pump comprises a pump barrel, a plunger and a pull rod, wherein the plunger is sleeved in the pump barrel in an axially sliding manner, the lower end of the pump barrel is provided with a fixed valve, the lower end and the upper end of the plunger are respectively provided with a lower traveling valve and an upper traveling valve, the lower end of the pull rod is fixedly connected with the upper end of the plunger, and the side wall of the upper end of the pump barrel is provided with an oil outlet.

9. The water shutoff oil production string according to claim 8,

the pump barrel comprises an upper pump barrel, a middle pump barrel and a lower pump barrel which are sequentially fixed from top to bottom, the oil outlet is formed in the side wall of the upper end of the upper pump barrel, the fixed valve is arranged at the bottom end of the lower pump barrel, and the plunger is located in the lower pump barrel;

the inner diameter of the middle pump cylinder is smaller than the inner diameters of the upper pump cylinder and the lower pump cylinder, and the inner diameter of the middle pump cylinder is larger than the diameter of the pull rod and smaller than the outer diameter of the plunger.

10. The water shutoff oil production string according to claim 1,

and a screen pipe is arranged between the oil pipe and the secondary butt joint device.

11. The water shutoff oil production string according to claim 1,

and an oil pipe anchor is also arranged between the releasing butt-joint device and the production allocation assembly.

12. The water shutoff oil production string according to claim 1,

each production allocation assembly comprises a production allocation device and a packer arranged above the production allocation device, the releasing butt-joint device is electrically connected with the plurality of production allocation devices through production allocation cables, and the bottom end of the production allocation tubular column is also connected with a plug; and a butt joint cable is arranged on the outer wall of the production pipe column, and the lower end of the butt joint cable is electrically connected with the secondary butt joint device.

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