A pipe string using an integrated screen pipe for water control and plugging removal

Abstract

The invention discloses a pipe string using an integrated water control and plugging removal screen pipe, which relates to the technical field of oil and gas reservoir development, and comprises a packer and an integrated water control and plugging removal screen pipe, wherein the integrated water control and plugging removal screen pipe comprises a screen part and a single-flow water control short joint, wherein the screen part comprises a base pipe, an end ring, a filter sleeve and a butt plug, wherein the end ring, the filter sleeve and the butt plug are fixedly connected from top to bottom and wrapped around the outside of the base pipe; the single-flow water control short joint comprises a conversion joint, a valve seat, a swirl selection valve, a floating plate water control valve, a single-flow valve, a hydraulic control pipeline, an isolation sleeve and an outer sleeve, wherein the upper end of the valve seat is connected to the base pipe through a conversion joint, the outer sleeve is arranged on the outside of the valve seat, and three chambers are formed between the valve seat and the outer sleeve, wherein the swirl selection valve is located in the first chamber, the floating plate water control valve is located in the second chamber, and the single-flow valve is located in the third chamber; the pipe string can be applied to stratified acidification and plugging removal and water control production of vertical wells, inclined wells and horizontal wells in light oil reservoirs, wherein the construction process is simple and the production cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas reservoir development, and in particular to a pipe column using an integrated screen pipe for water control and plugging removal. Background Art

[0002] The high water content in oil wells has caused serious problems such as stable production in old oil fields and energy conservation and emission reduction in oil fields. The high water content in horizontal wells, which is difficult to manage, is particularly prominent. Currently, AICD products on the market are mostly targeted at medium and high viscosity crude oils, and have poor adaptability to low viscosity crude oils. In addition, conventional water control screen layered strings cannot directly perform formation acidification and blockage removal, and need to be lowered into internal strings, resulting in complex construction procedures, long construction time, and high production costs. Summary of the invention

[0003] The purpose of the present invention is to provide a pipe column using an integrated screen pipe for water control and plugging removal in view of the defects in the prior art.

[0004] The technical solution of the present invention is: a pipe string using an integrated water control and plugging solution screen, comprising a packer and an integrated water control and plugging solution screen connected to the lower side of the packer, wherein the integrated water control and plugging solution screen forms a first annulus with the formation or casing, and comprises a screen part and a single-flow water control short joint;

[0005] The screen part includes a base pipe, an end ring, a filter sleeve and a butt plug, wherein the end ring, the filter sleeve and the butt plug are fixedly connected from top to bottom and wrapped around the outside of the base pipe, and the end ring is fixed on the base pipe; the inner sides of the end ring, the filter sleeve and the butt plug and the outer side of the base pipe form a second annulus, and the first annulus and the second annulus are connected by the filter sleeve;

[0006] The single-flow water control short joint includes a conversion joint, a valve seat, a swirl selection valve, a floating plate water control valve, a single-flow valve, a hydraulic control pipeline, an isolation sleeve and an outer sleeve. The upper end of the valve seat is connected to the base pipe through a conversion joint, and the outer sleeve is arranged on the outer side of the valve seat, and its upper end is sealed and connected to the docking plug; three chambers are formed between the valve seat and the outer sleeve, which are the first chamber, the second chamber and the third chamber from top to bottom; the first chamber is connected to the second annulus, the swirl selection valve is located in the first chamber, the floating plate water control valve is located in the second chamber, and the single-flow valve is located in the third chamber.

[0007] Preferably, the swirl selection valve includes a bracket, a gear sleeve, a gear sleeve base, a bearing, a rotating baffle and a positioning pin. The gear sleeve and the gear sleeve base are rotatably mounted on the bracket through a bearing. A plurality of liquid inlets are provided on the side of the gear sleeve. The two rotating baffles are hinged to the gear sleeve base through positioning pins for controlling the switch of the liquid inlet. A liquid outlet is provided in the bracket.

[0008] Preferably, the rotating baffle is made of polypropylene, which has a density greater than oil and less than water. In a rotating state, the opening and closing of the liquid inlet on the side of the gear sleeve can be controlled according to the fluid density.

[0009] Preferably, the floating plate water control valve includes a pressing plate, a floating plate and a base, the pressing plate is fixed on the top of the base, and a liquid inlet is provided on the pressing plate; a lateral hole and a bottom liquid outlet are provided on the base, the floating plate is slid up and down in the inner cavity of the base, and the lateral hole connects the cavity formed by the floating plate and the base.

[0010] Preferably, the floating sheet is made of ceramic or aluminum alloy.

[0011] Preferably, the valve seat is provided with a flow hole, a connecting hole, a through hole, a confluence hole and a production hole, the flow hole connects the first chamber and the second chamber, the through hole is connected to the liquid outlet of the floating plate water control valve, the isolation sleeve is fixedly inserted in the valve seat, and the annulus between the two connects the second chamber and the third chamber with the through hole and the confluence hole; the production hole connects the third chamber and the inner cavity of the tubing column, the check valve is located between the confluence hole and the production hole, and only allows liquid to flow downward; the liquid control pipeline is connected to the liquid outlet of the swirl selection valve and the lateral hole of the floating plate water control valve through the connecting hole.

[0012] Preferably, the one-flow valve comprises a sealing valve component and an overflow valve component connected up and down, the sealing valve component has a smaller number of openings than the overflow valve component, and the lower ends of the openings of the sealing valve component each accommodate a steel ball, and when the steel ball falls on the sealing valve component, the flow channel is closed; when the steel ball falls on the overflow valve component, the flow channel is opened.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] This pipe string can be used for stratified acidification and plugging removal and water control production in vertical wells, inclined wells and horizontal wells in light oil reservoirs. It has simple construction procedures, reduces production costs and increases oil well production.

[0015] The check valve can open and close adaptively. During acidizing, the screen is closed and the acidification and plugging removal of the formation is completed directly through the screen without the need to run an internal pipe string. During production, the check valve flow channel automatically opens for production.

[0016] The swirl selector valve is density sensitive. It cooperates with the floating plate water control valve to control water and stabilize oil in light oil reservoirs. When the fluid is water, the density of water is large, and the rotating baffle of the swirl selector valve in the rotating state shrinks inward, and water enters through the liquid inlet of the gear sleeve, flows through the bracket, hydraulic control pipeline, connecting hole, hydraulic control pipeline, and enters the cavity formed by the floating plate and the base through the lateral hole of the floating plate water control valve, lifts the floating plate to reduce the opening of the upper liquid inlet hole, and cooperates with the buoyancy generated by water flowing through the floating plate to control the output of water. When the fluid is oil, the density of oil is small, and the rotating baffle of the swirl selector valve in the rotating state expands outward, closing the liquid inlet of the gear sleeve, and the oil in the second cavity reaches the liquid outlet of the base through the upper liquid inlet of the floating plate water control valve for production. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an overall cross-sectional view of the present invention;

[0018] Figure 2 Cross-sectional view of integrated screen tube for water control and plugging resolution;

[0019] Figure 3 It is a cross-sectional view of a single flow control water nipple;

[0020] Figure 4 for Figure 3 Sectional view at AA in the middle;

[0021] Figure 5 It is a cross-sectional view of a swirl selector valve;

[0022] Figure 6 A side view of a swirl selector valve;

[0023] Figure 7 It is a cross-sectional view of a floating plate water control valve;

[0024] Figure 8 It is a cross-sectional view of a check valve;

[0025] Fig. 9 It is a schematic diagram of the flow of water phase in the swirl selection valve and the floating plate water control valve;

[0026] Fig.10 Schematic diagram of the flow of oil phase in the swirl selector valve and the floating plate water control valve.

[0027] In the figure: 1. Packer, 2. Integrated screen for water control and plugging removal, 3. Piston, 4. Upper cone, 5. Rubber cylinder, 6. Screen part, 7. Single flow water control nipple, 8. Base pipe, 9. End ring, 10. Filter sleeve, 11. Butt plug, 12. Converter, 13. Valve seat, 1301. Flow hole, 1302. Connection hole, 1303. Through hole, 1304. Confluence hole, 1305. Production hole, 14. Swirl selector valve, 15. Float water control valve, 16. Check valve, 17. Hydraulic control pipeline, 18. Isolation sleeve, 19. Outer sleeve, 20. Bracket, 21. Gear sleeve, 22. Gear sleeve base, 23. Rotating baffle, 24. Bearing, 25. Locating pin, 26. Pressing plate, 27. Floating plate, 28. Base, 2801, lateral hole, 29. Sealing valve component, 30. Excess flow valve component, 31. Steel ball. DETAILED DESCRIPTION

[0028] The present invention is further described below with reference to the accompanying drawings and embodiments. Embodiment 1

[0029] Reference Figure 1-7 As shown, a pipe string using an integrated water control and plugging solution screen pipe 2 includes a packer 1 and an integrated water control and plugging solution screen pipe 2 connected to the lower side of the packer 1, the packer 1 includes a piston 3, an upper cone 4 and a rubber tube 5, the integrated water control and plugging solution screen pipe 2 forms a first annulus with the formation or casing, and includes a screen part 6 and a single-flow water control short joint 7.

[0030] The screen part 6 includes a base pipe 8, an end ring 9, a filter sleeve 10 and a docking plug 11. The end ring 9, the filter sleeve 10 and the docking plug 11 are fixedly connected from top to bottom and wrapped around the outside of the base pipe 8, and the end ring 9 is fixed on the base pipe 8; the inner sides of the end ring 9, the filter sleeve 10 and the docking plug 11 and the outer side of the base pipe 8 form a second annulus, and the first annulus and the second annulus are connected by the filter sleeve 10.

[0031] The single-flow water control short joint 7 includes a conversion joint 12, a valve seat 13, a swirl selection valve 14, a floating plate water control valve 15, a single-flow valve 16, a hydraulic control pipeline 17, an isolation sleeve 18 and an outer sleeve 19. The upper end of the valve seat 13 is connected to the base pipe 8 through the conversion joint 12. The outer sleeve 19 is sleeved on the outer side of the valve seat 13, and its upper end is sealed and connected to the docking plug 11; three chambers are formed between the valve seat 13 and the outer sleeve 19, which are the first chamber, the second chamber and the third chamber from top to bottom; the first chamber is connected to the second annulus, the swirl selection valve 14 is located in the first chamber, the floating plate water control valve 15 is located in the second chamber, and the single-flow valve 16 is located in the third chamber.

[0032] The swirl selector valve 14 includes a bracket 20, a gear sleeve 21, a gear sleeve base 22, a bearing 24, a rotating baffle 23 and a positioning pin 25. The gear sleeve 21 and the gear sleeve base 22 are rotatably mounted on the bracket 20 through the bearing 24. A plurality of liquid inlets are opened on the side of the gear sleeve 21. Two rotating baffles 23 are hinged on the gear sleeve base 22 through the positioning pin 25 to control the switch of the liquid inlet. A liquid outlet is provided in the bracket 20.

[0033] In more detail, the rotating baffle 23 is made of polypropylene, which has a density greater than oil and less than water. In the rotating state, the opening and closing of the liquid inlet on the side of the gear sleeve 21 can be controlled according to the fluid density.

[0034] The floating plate water control valve 15 includes a pressing plate 26, a floating plate 27 and a base 28. The pressing plate 26 is fixed on the top of the base 28, and a liquid inlet is opened on the pressing plate 26; a lateral hole 2801 and a bottom liquid outlet are provided on the base 28, and the floating plate 27 is slidably arranged in the inner cavity of the base 28 up and down, and the lateral hole 2801 connects the cavity formed by the floating plate 27 and the base 28.

[0035] The valve seat 13 is provided with a flow hole 1301, a connecting hole 1302, a through hole 1303, a confluence hole 1304 and a production hole 1305. The flow hole 1301 is connected to the first chamber and the second chamber, the through hole 1303 is connected to the liquid outlet of the floating plate water control valve 15, and the isolation sleeve 18 is fixedly inserted in the valve seat 13. The annulus between the two and the through hole 1303 and the confluence hole 1304 are connected to the second chamber and the third chamber; the production hole 1305 is connected to the third chamber and the inner cavity of the pipe column, and the check valve 16 is located between the confluence hole 1304 and the production hole 1305, and only allows liquid to flow downward; the liquid control pipeline 17 is connected to the liquid outlet of the swirl selection valve 14 and the lateral hole 2801 of the floating plate water control valve 15 through the connecting hole 1302.

[0036] Specifically, during use, a pipe string using the integrated water control and plugging removal screen pipe 2 has, in order, a setting and acidizing and plugging removal state and a water control and production state. These two states are described in detail below.

[0037] (1) Sealing and acidification status

[0038] The pipe string is put into place for sealing and acid plugging removal. A pipe string using a water control and plugging removal integrated screen pipe 2 is as follows Figure 1 As shown, each component of the string is in the initial position. During the setting, the construction is carried out through the inside of the string, and the liquid enters the third chamber of the single flow water control short joint 7 through the production hole 1305. The flow channel of the single flow valve 16 is closed. The pressure is continued. At this time, the liquid pushes the piston 3 of the isolation packer 1, and then pushes the upper cone 4 to compress the rubber cylinder 5 to achieve sealing. After the pressure is continued, the sliding sleeve at the lower end of the screen is opened and the acid is injected. The acid enters the formation through the sliding sleeve to achieve acid unblocking operation.

[0039] (2) Water control production status

[0040] During production, the formation fluid flows from the first annulus through the filter sleeve 10 into the end ring 9, the filter sleeve 10, the inner side of the butt plug 11 and the outer side of the base pipe 8 to form a second annulus, and then passes through the butt plug 11 into the first cavity of the single flow control water nipple 7.

[0041] like Fig.10 As shown, when the fluid is in the oil phase, the fluid entering the first cavity pushes the gear sleeve 21 and the gear sleeve base 22 of the swirl selector valve 14 to rotate around the bracket 20 through the bearing 24. Under the action of centrifugal force, the rotating baffle 23 installed on the positioning pin 25 moves. Since the density of the rotating baffle 23 is greater than that of the oil, the outer side of the rotating baffle 23 is pressed against the inner wall of the gear sleeve 21, closing the liquid inlet on the outer side of the gear sleeve 21, and the fluid cannot enter. At this time, the fluid enters the second chamber through the flow hole 1301 on the valve seat 13, and then flows into the valve through the liquid inlet of the floating plate water control valve 15, enters the annulus formed by the valve seat 13 and the isolation sleeve 18 through the liquid outlet of the base 28, and then enters the third chamber through the confluence hole 1304. Finally, the fluid passes through the check valve 16 and enters the inner cavity of the pipe column through the production hole 1305, and finally reaches the ground.

[0042] like Fig. 9 As shown, when the fluid is in the water phase, the fluid entering the first cavity pushes the gear sleeve 21 and the gear sleeve base 22 of the swirl selector valve 14 to rotate around the bracket 20 through the bearing 24. Under the action of centrifugal force, the rotating baffle 23 installed on the positioning pin 25 moves. Since the density of the rotating baffle 23 is less than that of water, the rotating baffle 23 shrinks inward, opening the outer liquid inlet of the gear sleeve 21, and part of the fluid enters the inner cavity of the swirl selector valve 14, and reaches the floating plate water control valve 15 through the hydraulic control pipeline 17, the connecting hole 1302, and the hydraulic control pipeline 17. The water in the lateral hole 2801 pushes the float 27 upward, reducing the opening of the top liquid inlet of the float water control valve 15; the remaining fluid enters the second chamber through the flow hole 1301 of the valve seat 13, and then flows into the valve through the liquid inlet of the float water control valve 15. Due to the fast flow rate of water, it flows through the float 27 and generates buoyancy, causing the float 27 to move further upward, further reducing the opening of the liquid inlet, and finally a small amount of water enters the third chamber through the confluence hole 1304, enters the inner cavity of the tubing through the check valve 16 and the production hole 1305, and finally reaches the ground.

[0043] When multiple pipe strings are connected in sequence, they can be used in light oil reservoir wells for stratified acidification and plugging removal and water control production.

[0044] This pipe string can be used for stratified acidification and plugging removal and water control production in vertical wells, inclined wells and horizontal wells in light oil reservoirs. The construction process is simple, production costs are reduced, and oil well production is increased. The check valve 16 can open and close adaptively, close the screen pipe during acidification, and directly complete the acidification and plugging removal of the formation through the screen pipe without running the internal pipe string; during production, the flow channel of the check valve 16 is automatically opened for production. The swirl selector valve 14 is density sensitive, and cooperates with the floating plate water control valve 15 to control water and stabilize oil in light oil reservoirs. When the fluid is water, the density of water is large, and the rotating baffle 23 of the swirl selector valve 14 in the rotating state shrinks inward, and water enters through the liquid inlet of the gear sleeve 21, flows through the bracket 20, the hydraulic control pipeline 17, the connecting hole 1302, the hydraulic control pipeline 17, and enters the cavity formed by the floating plate 27 and the base 28 through the lateral hole 2801 of the floating plate water control valve 15, lifts the floating plate 27 to reduce the opening of the upper liquid inlet hole, and cooperates with the buoyancy generated by the water flowing through the floating plate 27 to control the output of water. When the fluid is oil, the density of oil is small, and the rotating baffle 23 of the swirl selector valve 14 in the rotating state expands outward, closing the liquid inlet of the gear sleeve 21, and the oil in the second cavity reaches the liquid outlet of the base 28 through the upper liquid inlet of the floating plate water control valve 15 for production. Embodiment 2

[0045] As a preferred embodiment of the present invention, this embodiment designs the structure of the check valve 16 on the basis of the first embodiment, specifically:

[0046] Reference Figure 8 As shown, the one-flow valve 16 of this embodiment includes a sealing valve component 29 and an overflow valve component 30 connected up and down. The number of openings of the sealing valve component 29 is smaller than that of the overflow valve component 30. The lower ends of the openings of the sealing valve component 29 each accommodate a steel ball 31. When the steel ball 31 falls on the sealing valve component 29, the flow channel is closed; when the steel ball 31 falls on the overflow valve component 30, the flow channel is opened. Embodiment 3

[0047] As a preferred embodiment of the present invention, this embodiment selects the material of the floating sheet 27 based on the second embodiment, specifically:

[0048] In this embodiment, the floating sheet 27 is made of ceramic or aluminum alloy, which has low density and high erosion resistance.

[0049] The present invention is not limited to the above-mentioned embodiments. Various changes can be made within the knowledge scope of those skilled in the art without departing from the spirit of the present invention. The changed contents still fall within the protection scope of the present invention.

Claims

1. A pipe string using an integrated screen pipe for water control and plugging removal, including a packer, characterized in that: It also includes a water control and plugging removal integrated screen connected to the lower side of the packer, the water control and plugging removal integrated screen and the formation or casing form a first annulus, which includes a screen part and a single-flow water control short joint; The screen part includes a base pipe, an end ring, a filter sleeve and a butt plug, wherein the end ring, the filter sleeve and the butt plug are fixedly connected from top to bottom and wrapped around the outside of the base pipe, and the end ring is fixed on the base pipe; the inner sides of the end ring, the filter sleeve and the butt plug and the outer side of the base pipe form a second annulus, and the first annulus and the second annulus are connected by the filter sleeve; The single-flow water control nipple comprises a conversion joint, a valve seat, a swirl selector valve, a floating plate water control valve, a check valve, a hydraulic control pipeline, an isolation sleeve and an outer sleeve. The upper end of the valve seat is connected to the base pipe through a conversion joint. The outer sleeve is arranged on the outer side of the valve seat, and its upper end is sealed and connected to the docking plug; three chambers are formed between the valve seat and the outer sleeve, which are the first chamber, the second chamber and the third chamber from top to bottom; the first chamber is connected to the second annulus, the swirl selector valve is located in the first chamber, the floating plate water control valve is located in the second chamber, and the check valve is located in the third chamber; The swirl selector valve comprises a bracket, a gear sleeve, a gear sleeve base, a bearing, a rotating baffle and a positioning pin. The gear sleeve and the gear sleeve base are rotatably mounted on the bracket through the bearing. A plurality of liquid inlets are provided on the side of the gear sleeve. The two rotating baffles are hinged to the gear sleeve base through the positioning pin to control the switch of the liquid inlet. A liquid outlet is provided in the bracket. The floating plate water control valve comprises a pressing plate, a floating plate and a base, wherein the pressing plate is fixed on the top of the base and is provided with a liquid inlet; the base is provided with a lateral hole and a bottom liquid outlet, the floating plate is slidably arranged in the inner cavity of the base, and the lateral hole connects the cavity formed by the floating plate and the base; The valve seat is provided with a flow hole, a connecting hole, a through hole, a confluence hole and a production hole. The flow hole connects the first chamber and the second chamber, the through hole is connected to the liquid outlet of the floating plate water control valve, the isolation sleeve is fixedly inserted in the valve seat, and the annulus between the two is connected to the second chamber and the third chamber through the through hole and the confluence hole; the production hole is connected to the third chamber and the inner cavity of the pipe column, and the check valve is located between the confluence hole and the production hole, and only allows liquid to flow downward; the liquid control pipeline is connected to the liquid outlet of the swirl selection valve and the lateral hole of the floating plate water control valve through the connecting hole.

2. A pipe string using an integrated screen pipe for water control and plugging removal according to claim 1, characterized in that: The rotating baffle is made of polypropylene, which has a density greater than oil and less than water. In a rotating state, it can control the opening and closing of the liquid inlet on the side of the gear sleeve according to the fluid density.

3. A pipe string using an integrated screen pipe for water control and plugging removal according to claim 1, characterized in that: The floating sheet is made of ceramic or aluminum alloy.

4. A pipe string using an integrated screen pipe for water control and plugging removal according to claim 1, characterized in that: The one-flow valve comprises a sealing valve component and an overflow valve component connected up and down. The number of openings of the sealing valve component is smaller than that of the overflow valve component. The lower ends of the openings of the sealing valve component each accommodate a steel ball. When the steel ball falls on the sealing valve component, the flow channel is closed; when the steel ball falls on the overflow valve component, the flow channel is opened.

Images