Bridge type working barrel for synchronous injection and production in same well of horizontal well

Abstract

The invention discloses a bridge type working barrel for synchronous injection and production of a horizontal well in the same well, and relates to the technical field of oilfield development. According to the bridge type working barrel for synchronous injection and production in the same well of the horizontal well, by arranging the fixed barrel body, the bridge type working barrel body, the injection water bridge type channel, the produced liquid flowing channel, the telescopic sleeve and the sealing barrel body, the independent produced liquid flowing channel and the injection water bridge type channel are designed; the purpose that injected water and produced liquid are injected and produced through respective independent flow channels is achieved, the problem that oil production injected water and produced liquid flow channels at the two end sections of water injection in the middle section of the horizontal well interfere with each other can be effectively solved, and the applicability of the horizontal well same-well synchronous injection and production process pipe column is further widened. The bridge type working barrel body has the advantages of being simple in design, easy and convenient to operate, good in sealing performance and the like, the working environment of a low-permeability oil field horizontal well development site is better met, and meanwhile production cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of oilfield development, in particular to the technical field of oilfield water injection, and specifically to a bridge-type working cylinder used for synchronous injection and production of horizontal wells. Background Art

[0002] Nowadays, the development of horizontal wells in low-permeability oil fields has problems such as unclear formation energy replenishment effect, difficulty in establishing an effective displacement system, large decline, and water easily appearing in fractures in some wells. Same-well injection and production is a new technology for oil production and water injection in the same well. It is an effective means to establish lateral displacement of the wellbore. However, the working barrel structure for simultaneous oil production and water injection is not very complete, and water and oil are easily mixed during operation.

[0003] For example, the utility model with patent publication number CN201711232033.9 discloses a bridge joint and a single-tube water injection production pipe string, the bridge joint includes: a packer and an upper joint and a lower joint connected to the upper and lower ends of the packer; and the side wall of the upper joint is provided with a plurality of connecting holes, and the side wall of the lower joint is provided with a first long slot hole; it also includes a bridge-type inner tube fixedly connected to the interior of the lower joint, and the side wall of the bridge-type inner tube is provided with a second long slot hole corresponding to and connected to the first long slot hole; a connecting inner tube, the first end of which is fixedly connected to the bridge-type inner tube, and the second end is located above the connecting hole of the upper joint. The single-tube water injection production pipe string includes: a bridge joint, in which a first flow channel and a second flow channel are provided, the bridge joint includes a packer; an oil production pipe string connected to the upper end of the bridge joint and connected to the first flow channel; a water injection pipe string connected to the lower end of the bridge joint and connected to the second flow channel; and a sealing plug is provided at the lower end of the water injection pipe string. The invention has a simple structure and achieves the purpose of simultaneous injection and production in a small-casing multi-branch well.

[0004] The production tubing in this patent cannot be used for synchronous injection and production in horizontal wells, and the development energy is insufficient. To address the problem of insufficient development energy for horizontal wells in low permeability reservoirs, a bridge-type production mandrel suitable for synchronous injection and production in horizontal wells has been designed and developed. The bridge-type production mandrel is used for the synchronous injection and production process of water injection in the middle section and oil production at both end sections of horizontal wells, filling the market gap for such products and meeting the needs for synchronous injection and production in horizontal wells. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a bridge-type working cylinder for synchronous injection and production in horizontal wells, which solves the problem of insufficient energy for the development of horizontal wells in low-permeability oil reservoirs.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a bridge-type working cylinder for synchronous injection and production in a horizontal well, comprising a fixed cylinder, a first fixed sleeve fixedly installed at the end of the fixed cylinder, a second fixed sleeve fixedly installed at the other end of the fixed cylinder, a bridge-type working cylinder body fixedly installed on the outside of the first fixed sleeve, a partition cylinder fixedly installed inside the bridge working cylinder body, a third channel is arranged inside the partition cylinder body, produced liquid flow channels are arranged on the upper and lower sides of the bridge working cylinder body, an injection water bridge channel is arranged between the partition cylinder and the bridge working cylinder body, baffles are detachably installed at the upper and lower ends of the partition cylinder, a central insert is detachably installed inside the partition cylinder, a sealing cylinder is fixedly installed at the outer end of the bridge working cylinder body, a fixed joint is detachably installed on the outer side of the sealing cylinder, a telescopic sleeve is movably installed on the outside of the second fixed sleeve, the telescopic sleeve extends to the inside of the second fixed sleeve, fixed blocks are fixedly installed at the upper and lower ends of the telescopic sleeve, a connecting sleeve is fixedly installed at the end of the telescopic sleeve, and a filter joint is detachably installed on the connecting sleeve.

[0007] Preferably, a cone is fixedly installed on the outside of the fixed joint, a protective cover is fixedly installed on the end of the cone, and an infrared rangefinder is arranged inside the protective cover.

[0008] Preferably, a groove is provided on the surface of the filter joint, a connecting ring is fixedly installed inside the groove, and the connecting ring is threadedly connected to the connecting sleeve.

[0009] Furthermore, a first connecting plate is fixedly installed inside the filter joint, and a second connecting plate corresponding to the first connecting plate is arranged on the side of the first connecting plate.

[0010] Furthermore, a first filter net is arranged on the outer sides of the first connecting plate and the second connecting plate, and a second filter net is arranged between the first connecting plate and the second connecting plate.

[0011] Furthermore, an external central tube is arranged outside the filter joint, and the external central tube is fixedly mounted on the first connecting plate and the second connecting plate.

[0012] Preferably, a support platform is fixedly mounted on the upper end of the sealing cylinder, a flow pipe is fixedly mounted on the upper end of the support platform, and a water inlet pipe is fixedly connected to the upper end of the flow pipe.

[0013] Furthermore, water outlet pipes are fixedly connected to both sides of the circulation pipe, and the water outlet pipes extend to the interior of the sealing cylinder.

[0014] Preferably, clamping strips are fixedly installed on both sides of the telescopic sleeve, and clamping grooves corresponding to the clamping strips are opened on the inner walls of the fixed cylinder and the second fixed sleeve.

[0015] Furthermore, a limiting ring is fixedly installed at the end of the telescopic sleeve, and a material guide plate corresponding to the partition cylinder is fixedly installed inside the telescopic sleeve.

[0016] Beneficial Effects

[0017] The present invention provides a bridge-type mandrel for synchronous injection and production in horizontal wells. Compared with the prior art, it has the following beneficial effects:

[0018] The bridge-type working cylinder used for synchronous injection and production in horizontal wells is designed with an independent production fluid flow channel and an injection water bridge-type channel by arranging a fixed cylinder body, a bridge-type working cylinder body, an injection water bridge-type channel, a production fluid flow channel, a telescopic sleeve and a sealing cylinder body, so as to realize the purpose of injection water and production fluid being injected and produced through their own independent flow channels, and can effectively solve the problem of mutual interference between the injection water and production fluid flow channels at the two end sections of the horizontal well for water injection in the middle section, and further broaden the applicability of the process string for synchronous injection and production in horizontal wells. The bridge-type working cylinder body has the characteristics of simple design, easy operation, good sealing performance, etc., which is more in line with the working environment of the horizontal well development site in low permeability oilfields, and also reduces the production cost. In addition, the telescopic sleeve can be arbitrarily extended and retracted in the fixed cylinder body, so as to facilitate the adjustment of the length of the entire production string, and is more suitable for actual work needs. A filter joint is also installed outside the telescopic sleeve for filtering oil and water, and the filtered impurities are concentrated and collected at the filter joint for convenient later cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the installation structure of the central cannula in the present invention;

[0021] Figure 3 It is a cross-sectional view of the bridge type working cylinder body in the present invention;

[0022] Figure 4 It is a structural schematic diagram of the telescopic sleeve in the present invention;

[0023] Figure 5 It is a schematic diagram of the structure of the filter joint in the present invention;

[0024] Figure 6 For the present invention Figure 1 Schematic diagram of the structure at A in the middle.

[0025] In the figure: 1. fixed cylinder; 2. first fixed sleeve; 3. second fixed sleeve; 4. bridge working cylinder body; 5. sealing cylinder; 6. fixed joint; 7. cone; 8. protective cover; 9. telescopic sleeve; 10. filter joint; 11. external center pipe; 12. center insert; 13. produced liquid flow channel; 14. injected water bridge channel; 15. partition cylinder; 16. third channel; 17. baffle; 18. connecting sleeve; 19. fixed block; 20. clamping strip; 21. limit ring; 22. guide plate; 23. groove; 24. connecting sleeve ring; 25. first connecting plate; 26. second connecting plate; 27. first filter screen; 28. second filter screen; 29. ​​support platform; 30. circulation pipe; 31. outlet pipe; 32. inlet pipe. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Example 1: Please refer to Figure 1-6 A bridge-type working cylinder for synchronous injection and production in a horizontal well comprises a fixed cylinder body 1, a first fixed sleeve 2 is fixedly installed at the end of the fixed cylinder body 1, a second fixed sleeve 3 is fixedly installed at the other end of the fixed cylinder body 1, a bridge-type working cylinder body 4 is fixedly installed outside the first fixed sleeve 2, a partition cylinder body 15 is fixedly installed inside the bridge-type working cylinder body 4, a third channel 16 is arranged inside the partition cylinder body 15, and a produced liquid flow channel 13 is arranged on the upper and lower sides of the bridge-type working cylinder body 4, and an injection water bridge channel 14 is arranged between the partition cylinder body 15 and the bridge-type working cylinder body 4. By arranging the produced liquid flow channel 13 and the injection water bridge channel 14, the purpose of injection and production of injected water and produced liquid through their own independent flow channels is achieved, which can effectively solve the problem of water injection in the middle section and oil production at both end sections of the horizontal well. To solve the problem of interference between the injected water and produced liquid flow channels, baffles 17 are detachably installed at the upper and lower ends of the partition cylinder 15, a central insert 12 is detachably installed inside the partition cylinder 15, a sealing cylinder 5 is fixedly installed at the outer end of the bridge working cylinder body 4, a fixed joint 6 is detachably installed on the outer side of the sealing cylinder 5, a telescopic sleeve 9 is movably installed on the outside of the second fixed sleeve 3, the telescopic sleeve 9 can be moved arbitrarily at the fixed joint 6, so as to change the length of the entire oil column, the telescopic sleeve 9 extends to the inside of the second fixed sleeve 3, fixed blocks 19 are fixedly installed at the upper and lower ends of the telescopic sleeve 9, a connecting sleeve 18 is fixedly installed at the end of the telescopic sleeve 9, a filter joint 10 is detachably installed on the connecting sleeve 18, and the filter joint 10 can be used to filter oil and water to remove impurities in the liquid;

[0028] A cone 7 is fixedly mounted on the outside of the fixed joint 6, a protective cover plate 8 is fixedly mounted on the end of the cone 7, and an infrared rangefinder is arranged inside the protective cover plate 8. The infrared rangefinder can be used to measure distance, thereby increasing the functionality of the device;

[0029] Specifically, Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 6 As shown, the fixed cylinder 1, the bridge-type working cylinder body 4, the sealing cylinder 5, the telescopic sleeve 9 and the filter joint 10 can be connected to each other, and an independent produced fluid flow channel 13 and an injected water bridge channel 14 are designed, which can effectively solve the problem of mutual interference between the injected water and produced fluid flow channels at both end sections of the middle section of the horizontal well, further broaden the applicability of the synchronous injection and production process string in the horizontal well, and has the characteristics of simple design, easy operation, good sealing, etc.

[0030] Embodiment 2: A groove 23 is provided on the surface of the filter joint 10, a connecting ring 24 is fixedly installed inside the groove 23, and the connecting ring 24 is threadedly connected to the connecting sleeve 18;

[0031] A first connecting plate 25 is fixedly installed inside the filter joint 10, and a second connecting plate 26 corresponding to the first connecting plate 25 is arranged on the side of the first connecting plate 25;

[0032] A first filter screen 27 is disposed outside the first connecting plate 25 and the second connecting plate 26, and a second filter screen 28 is disposed between the first connecting plate 25 and the second connecting plate 26;

[0033] An external central tube 11 is disposed outside the filter joint 10, and the external central tube 11 is fixedly mounted on the first connecting plate 25 and the second connecting plate 26;

[0034] Specifically, Figure 1 , Figure 4 and Figure 5 As shown, the first filter screen 27 and the second filter screen 28 can filter the liquid in the central insert tube 12, the injected water bridge channel 14 and the produced liquid flow channel 13 respectively, and accumulate impurities in the filter joint 10 to facilitate subsequent centralized cleaning.

[0035] Embodiment 3: A support platform 29 is fixedly mounted on the upper end of the sealing cylinder 5, a flow pipe 30 is fixedly mounted on the upper end of the support platform 29, and a water inlet pipe 32 is fixedly connected to the upper end of the flow pipe 30;

[0036] The two sides of the flow pipe 30 are fixedly connected with water outlet pipes 31, and the water outlet pipes 31 extend to the inside of the sealing cylinder 5;

[0037] Specifically, Figure 1and Figure 6 As shown, by setting the water outlet pipe 31, the water inlet pipe 32 and the circulation pipe 30, external clean water can be injected into the sealing cylinder 5 and the bridge-type working cylinder body 4.

[0038] Embodiment 4: The two sides of the telescopic sleeve 9 are fixedly installed with clamping strips 20, and the inner walls of the fixed cylinder 1 and the second fixed sleeve 3 are provided with clamping grooves corresponding to the clamping strips 20;

[0039] A limit ring 21 is fixedly installed at the end of the telescopic sleeve 9, and a guide plate 22 corresponding to the partition cylinder 15 is fixedly installed inside the telescopic sleeve 9;

[0040] Specifically, Figure 1 and Figure 4 As shown, through the cooperation between the clamping strip 20 and the clamping slot, the moving position of the telescopic sleeve 9 can be restricted to prevent the telescopic sleeve 9 from being offset during the movement.

[0041] During operation, the bridge working cylinder body 4 is first installed on the first fixed sleeve 2, and then the sealing cylinder 5 is installed on one side of the bridge working cylinder body 4, so that the bridge working cylinder body 4 can form a whole with the entire pipe string, and then the water inlet pipe 32 is connected to the external water pipe, and the fixed joint 6 is opened at the same time to inject water and produce fluid. An independent produced fluid flow channel 13 and an injected water bridge channel 14 are designed, so that the purpose of injecting and producing injected water and produced fluid through their own independent flow channels is achieved, which can effectively solve the problem of mutual interference between the injected water and produced fluid flow channels at the two end sections of the horizontal well for water injection in the middle section, and further broaden the applicability of the horizontal well same-well synchronous injection and production process pipe string, and the bridge working cylinder body 4 has the characteristics of simple design, easy operation, good sealing, etc., which is more in line with the working environment of the horizontal well development site in low permeability oilfields.

[0042] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

Claims

1. A bridge-type working cylinder for synchronous injection and production in a horizontal well, comprising a fixed cylinder (1), characterized in that: A first fixing sleeve (2) is fixedly mounted on the end of the fixing cylinder (1), a second fixing sleeve (3) is fixedly mounted on the other end of the fixing cylinder (1), a bridge-type working cylinder body (4) is fixedly mounted on the outside of the first fixing sleeve (2), a partitioning cylinder (15) is fixedly mounted on the inside of the bridge-type working cylinder body (4), a third channel (16) is arranged on the inner side of the partitioning cylinder (15), produced liquid flow channels (13) are arranged on the upper and lower sides of the bridge-type working cylinder body (4), an injected water bridge channel (14) is arranged between the partitioning cylinder (15) and the bridge-type working cylinder body (4), and the upper and lower ends of the partitioning cylinder (15) are detachable. A baffle (17) is installed in a detachable manner on the interior of the partition cylinder (15); a central insert (12) is detachably installed inside the partition cylinder (15); a sealing cylinder (5) is fixedly installed on the outer end of the bridge-type working cylinder body (4); a fixed joint (6) is detachably installed on the outer side of the sealing cylinder (5); a telescopic sleeve (9) is movably installed on the outside of the second fixed sleeve (3); the telescopic sleeve (9) extends into the interior of the second fixed sleeve (3); fixed blocks (19) are fixedly installed on the upper and lower ends of the telescopic sleeve (9); a connecting sleeve (18) is fixedly installed on the end of the telescopic sleeve (9); and a filter joint (10) is detachably installed on the connecting sleeve (18).

2. A bridge-type mandrel for synchronous injection and production in horizontal wells according to claim 1, characterized in that: A cone (7) is fixedly mounted on the outside of the fixed joint (6), a protective cover plate (8) is fixedly mounted on the end of the cone (7), and an infrared rangefinder is arranged inside the protective cover plate (8).

3. The bridge-type mandrel for synchronous injection and production in horizontal wells according to claim 1, characterized in that: A groove (23) is provided on the surface of the filter joint (10), a connecting ring (24) is fixedly installed inside the groove (23), and the connecting ring (24) is threadedly connected to the connecting sleeve (18).

4. A bridge-type mandrel for synchronous injection and production in horizontal wells according to claim 3, characterized in that: A first connecting plate (25) is fixedly installed inside the filter joint (10), and a second connecting plate (26) corresponding to the first connecting plate (25) is arranged on the side of the first connecting plate (25).

5. The bridge-type mandrel for synchronous injection and production in horizontal wells according to claim 4, characterized in that: A first filter net (27) is arranged outside the first connecting plate (25) and the second connecting plate (26), and a second filter net (28) is arranged between the first connecting plate (25) and the second connecting plate (26).

6. The bridge-type mandrel for synchronous injection and production in horizontal wells according to claim 5, characterized in that: An external central tube (11) is arranged outside the filter joint (10), and the external central tube (11) is fixedly mounted on the first connecting plate (25) and the second connecting plate (26).

7. The bridge-type mandrel for synchronous injection and production in horizontal wells according to claim 1, characterized in that: A support platform (29) is fixedly mounted on the upper end of the sealing cylinder (5), a circulation pipe (30) is fixedly mounted on the upper end of the support platform (29), and a water inlet pipe (32) is fixedly connected to the upper end of the circulation pipe (30).

8. The bridge-type mandrel for synchronous injection and production in horizontal wells according to claim 7, characterized in that: Water outlet pipes (31) are fixedly connected to both sides of the circulation pipe (30), and the water outlet pipes (31) extend to the interior of the sealing cylinder (5).

9. The bridge-type mandrel for synchronous injection and production in horizontal wells according to claim 1, characterized in that: Clamping strips (20) are fixedly mounted on both sides of the telescopic sleeve (9), and clamping grooves corresponding to the clamping strips (20) are provided on the inner walls of the fixed cylinder (1) and the second fixed sleeve (3).

10. The bridge-type mandrel for synchronous injection and production in horizontal wells according to claim 9, characterized in that: A limiting ring (21) is fixedly mounted on the end of the telescopic sleeve (9), and a material guide plate (22) corresponding to the partition cylinder (15) is fixedly mounted inside the telescopic sleeve (9).

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