Modular intubation bridge plug

Abstract

The invention provides a modular intubation bridge plug which comprises an intubation assembly, a bridge plug assembly and a functional module assembly, and the intubation assembly comprises an intubation and an intubation releasing injection device connected to the lower portion of the intubation; the bridge plug assembly is movably arranged on the periphery of the insertion pipe assembly in a sleeving mode, and the lower portion of the bridge plug assembly is detachably connected with the functional module assembly. The functional module assembly comprises any one of a squeezing device, a sealing layer screwed plug and a hanging lower connector, and when the bridge plug assembly is connected with the squeezing device, high-pressure plugging agent squeezing construction is achieved; when the bridge plug assembly is connected with the sealing layer screwed plug, bridge plug sealing layer construction is achieved; when the bridge plug assembly is connected with the suspension lower connector, suspension clamping and sealing construction is achieved. According to the intubation bridge plug provided by the invention, a plurality of different purposes such as reservoir plugging, tail pipe hanging, clamping and sealing can be realized at the same time.

Description

Technical Field

[0001] The present application relates to the technical field of oil and gas development, and in particular to a modular intubation bridge plug. Background Art

[0002] The intubation bridge plug is a commonly used downhole tool for plugging injection and production wells in oil fields. Its main purpose is to replace the ash plug to plug the reservoir and the abandoned well. There are many types of bridge plugs, but their uses are relatively single, and each type of bridge plug can only complete one measure construction process. In various application scenarios, if different measures such as cement squeeze sealing, reservoir plugging, tail pipe suspension, and plugging are to be implemented, different bridge plugs are often required to be completed. For example, the sealing bridge plug can only achieve the construction of plugging oil and water layers, and the cement squeeze sealing layer can only use the intubation bridge plug. To achieve sand control, plugging, gas lift and other measures, it is necessary to use a hanging drop packer for construction.

[0003] Therefore, the existing intubation bridge plug cannot simultaneously achieve multiple different purposes such as plugging the reservoir, hanging the tail pipe, and plugging, and has high operating costs and poor economic benefits. Summary of the invention

[0004] In view of the above problems, the present invention provides a modular intubation bridge plug, which can simultaneously achieve multiple different purposes such as sealing the reservoir, hanging the tail pipe, and sealing. It has the advantages of versatility, flexibility and simplified construction, and can improve the efficiency and quality of oil well operations.

[0005] The technical solution of the present invention is:

[0006] A modular intubation bridge plug comprises an intubation assembly, a bridge plug assembly and a functional module assembly, wherein the functional module assembly is characterized in that different functions are realized by replacing different devices; wherein:

[0007] The cannula assembly comprises a cannula and a cannula drop-and-drop injection device connected to the lower part of the cannula, and the cannula drop-and-drop injection device is configured to open and close the outlet of the cannula;

[0008] The bridge plug assembly is movably sleeved on the outer periphery of the cannula assembly, the bridge plug assembly is configured to achieve plugging construction, and the lower part of the bridge plug assembly is detachably connected to the functional module assembly;

[0009] The functional module assembly includes any one of an extrusion device, a sealing plug and a hanging lower joint. When the bridge plug assembly is connected to the extrusion device, high-pressure extrusion plugging agent construction is realized; when the bridge plug assembly is connected to the sealing plug, bridge plug sealing construction is realized; when the bridge plug assembly is connected to the hanging lower joint, hanging card sealing construction is realized.

[0010] As one of the preferred solutions, the bridge plug assembly includes an outer central tube, the outer central tube is provided with a liquid inlet hole, and the outer side of the outer central tube is sequentially covered with an upper joint, an upper rubber cylinder, a seating mechanism, a lower rubber cylinder, a lower rubber cylinder seat, a sealing mechanism and a release mechanism from top to bottom; wherein,

[0011] The seat mechanism comprises an upper cone, a split slip and a lower cone, wherein the split slip is located between the upper cone and the lower cone, and the lower cone is connected to the outer center tube via a positioning pin;

[0012] The setting mechanism includes a setting piston, an upper piston sleeve, a lower joint, a shear pin sleeve and a connecting joint. The setting piston is located between the upper piston sleeve and the outer center tube and is adjacent to the liquid inlet hole. A support ring is installed on the lower joint. The connecting joint is connected to the shear pin sleeve through a setting pin.

[0013] As one of the preferred solutions, the release mechanism includes multiple positioning locking blocks, a lower piston sleeve and a release piston. The positioning locking blocks are located in the space formed by the insert tube, the connecting joint and the release piston. The release piston is connected to the lower piston sleeve through a release pin.

[0014] As one of the preferred solutions, the sealing mechanism includes a locking sleeve and a locking ring, wherein the locking sleeve is arranged at the lower part of the upper piston sleeve, and the locking ring is sleeved on the lower joint and located at the upper part of the support ring.

[0015] As one of the preferred solutions, both ends of the side of the positioning locking block in contact with the insertion tube are chamfered.

[0016] As one of the preferred solutions, the inner sides of both ends of the split slip are sloped surfaces, the upper cone and the lower cone respectively have inclined surfaces that fit the sloped surfaces, and the outer wall of the split slip is designed with a plurality of isosceles triangle serrations.

[0017] As one of the preferred schemes, the cannula drop-and-drop injection device includes a plug and a guide head, the guide head is connected to the bottom of the cannula, the bottom end of the guide head is provided with a plurality of first through holes along the axial direction of the cannula, a plurality of keyway-shaped first side holes are provided on the side wall of the cannula, the plug is provided inside the cannula corresponding to the upper part of the first side hole, and the cannula and the plug are connected by a plurality of plug pins.

[0018] As one of the preferred schemes, the squeezing device includes a sealing seat, a spring seat, a spring and a sealing valve stem, the sealing seat is connected to the bridge plug assembly and the spring seat respectively, the bottom end of the spring seat is provided with a plurality of second through holes, and the side wall is provided with a plurality of second side holes in the shape of keyways, the spring seat is open on one side close to the sealing seat and has a cavity inside, a T-shaped sealing valve stem is provided in the cavity, a spring is provided on the outer peripheral sleeve of the T-shaped sealing valve stem, and the transverse section of the T-shaped sealing valve stem movably seals the opening.

[0019] As one of the preferred solutions, the intubation bridge plug includes a sealing assembly, which includes at least a first sealing mechanism, a second sealing mechanism and a third sealing mechanism; wherein,

[0020] The first sealing mechanism includes a plurality of O-type sealing rings, and the plurality of O-type sealing rings are respectively arranged at matching gaps on the cannula assembly, the bridge plug assembly and the functional module assembly;

[0021] The second sealing mechanism is provided between the upper joint and the cannula, and comprises a first trapezoidal polytetrafluoroethylene sealing ring, a trapezoidal rubber sealing ring and a second trapezoidal polytetrafluoroethylene sealing ring connected in sequence in an array;

[0022] The third sealing mechanism comprises a trapezoidal sealing ring, which is located between the sealing seat and the spring seat.

[0023] As one of the preferred solutions, both ends of the transverse section of the T-shaped sealing valve stem have arc-shaped outer chamfers, so that the T-shaped sealing valve stem abuts against the inner shoulder of the sealing seat and the trapezoidal sealing ring respectively.

[0024] Compared with the prior art, this application has the following advantages:

[0025] The present invention proposes a modular intubation bridge plug, comprising an intubation assembly, a bridge plug assembly and a functional module assembly, wherein the functional module assembly is characterized in that different functions are realized by replacing different devices; wherein the intubation assembly comprises an intubation and an intubation release injection device connected to the lower part of the intubation, and the intubation release injection device is configured to open and close the outlet of the intubation; the bridge plug assembly is movably sleeved on the outer periphery of the intubation assembly, the bridge plug assembly is configured to realize plugging construction, and the lower part of the bridge plug assembly is detachably connected to the functional module assembly; the functional module assembly comprises any one of an extrusion device, a sealing layer plug and a hanging lower joint, and when the bridge plug assembly is connected to the extrusion device, high-pressure extrusion plugging agent construction is realized; when the bridge plug assembly is connected to the sealing layer plug, bridge plug sealing construction is realized; when the bridge plug assembly is connected to the hanging lower joint, hanging card sealing construction is realized.

[0026] By adopting the technical solution of the present application, the intubation bridge plug adopts an integral design, including three parts: an intubation assembly, a bridge plug assembly and a functional module assembly. During the operation, one trip of tubing can be used to complete the well entry, sealing, releasing, sealing inspection and measures of the intubation bridge plug. The functional module assembly is divided into three modules for different purposes, namely, an injection device, a sealing layer wire plug and a hanging lower joint, which can be converted into a bridge plug or a hanging releasing sealer to achieve different purposes such as squeezing, hanging and sealing. The operation process is simple, saves the number of tubing operations, reduces tool costs, and improves economic efficiency. It is used in high-angle wells and horizontal wells and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the description of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0028] Figure 1 It is a schematic diagram of the overall structure of a modular intubation bridge plug with an extrusion device according to an embodiment of the present application;

[0029] Figure 2 It is a schematic diagram of the overall structure of a modular intubation bridge plug with a sealing layer wire plug according to an embodiment of the present application;

[0030] Figure 3 It is a schematic diagram of the overall structure of a modular intubation bridge plug with a hanging lower joint according to an embodiment of the present application;

[0031] Figure 4 It is a cross-sectional view of the overall structure of the second sealing mechanism in one embodiment of the present application.

[0032] Description of reference numerals:

[0033] 1. Oil pipe coupling; 2. Insert pipe; 3. Upper joint; 4. Second sealing mechanism; 5. Outer center pipe; 6. First O-ring; 7. Protective bowl; 8. Upper rubber cylinder; 9. Upper cone; 10. Slip sleeve; 11. Split slip; 12. Hoop spring; 13. Lower cone; 14. Positioning pin; 15. Lower rubber cylinder; 16. Lower rubber cylinder seat; 17. Setting piston; 18. Second O-ring; 19. Lower joint; 20. Upper piston sleeve; 21. Locking ring; 22. Unsealing pin; 23. Support ring; 24. Locking sleeve; 25. Shearing nail sleeve; 26. Setting pin; 27. Connecting screw Connector; 28, lower piston sleeve; 29, positioning lock block; 30, release piston; 31, release pin; 32, lower outer sleeve; 33, third O-ring; 34, plug pin; 35, plug; 36, guide head; 37, sealing seat; 38, trapezoidal sealing ring; 39, spring seat; 40, spring; 41, sealing valve stem; 42, limit pin; 101, extrusion device; 102, sealing layer plug; 103, hanging lower joint; 411, first trapezoidal polytetrafluoroethylene sealing ring; 412, trapezoidal rubber sealing ring; 413, second trapezoidal polytetrafluoroethylene sealing ring. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] Reference Figure 1-Figure 3 As shown, Figure 1 The overall structural schematic diagram of the modular pipe-inserting bridge plug with the squeezing device 101 shown in the present invention; Figure 2 It is a schematic diagram of the overall structure of a modular intubation bridge plug with a sealing layer wire plug 102 shown in the present invention; Figure 3It is a schematic diagram of the overall structure of a modular intubation bridge plug with a suspended lower joint 103 according to the present invention. The present invention aims to provide a modular intubation bridge plug, comprising an intubation assembly, a bridge plug assembly and a functional module assembly, wherein the functional module assembly is characterized in that different functions are realized by replacing different devices; wherein the intubation assembly comprises an intubation 2 and an intubation release injection device connected to the lower part of the intubation 2, wherein the intubation release injection device is configured to open and close the outlet of the intubation 2; the bridge plug assembly is movably sleeved on the outer periphery of the intubation assembly, the bridge plug assembly is configured to realize plugging construction, and the lower part of the bridge plug assembly is detachably connected to the functional module assembly; the functional module assembly comprises any one of an extrusion device 101, a sealing layer plug 102 and a hanging lower joint 103, and when the bridge plug assembly is connected to the extrusion device 101, high-pressure extrusion plugging agent construction is realized; when the bridge plug assembly is connected to the sealing layer plug 102, bridge plug sealing construction is realized; when the bridge plug assembly is connected to the hanging lower joint 103, hanging card sealing construction is realized.

[0036] Specifically, the pipe bridge plug includes three major parts: a pipe assembly, a bridge plug assembly and a functional module assembly. The pipe assembly is configured to inject, discharge or transmit fluid in an oil well or a gas well. It can be lowered into the wellbore through a wellhead or downhole equipment to reach a specific depth. It can include an oil pipe coupling 1 and a pipe 2. The upper part of the oil pipe coupling 1 is connected to the oil pipe, and the lower part is connected to the pipe 2 through a thread.

[0037] In some embodiments, the cannula assembly may include a cannula hand-drop injection device, the lower part of the cannula 2 is connected to the cannula hand-drop injection device through a thread, and the cannula hand-drop injection device can be understood as a device for controlling the opening and closing operation of the cannula 2, and can realize the opening or closing of the outlet of the cannula 2 to control the flow path of the fluid. Among them, the outlet of the cannula 2 can be a hole for the fluid to discharge the cannula 2, which is usually located at the tail end of the cannula 2.

[0038] The bridge plug assembly can be understood as being connected to other assemblies to plug or isolate a specific location or layer in an oil well or wellbore to implement plugging measures. More descriptions of the bridge plug assembly are provided below. The bridge plug assembly can include a lower outer jacket 32, which is usually provided at the rear end of the bridge plug assembly, and the lower part of the lower outer jacket 32 ​​can be connected to the functional module assembly through threads.

[0039] The functional module assembly can be understood as different types of devices, which can be a squeezing device 101, a sealing plug 102, and a hanging lower joint 103. In this embodiment, the squeezing device 101 can cooperate with the cannula hand-release injection device. When the cannula hand-release injection device opens the outlet of the cannula 2, the squeezing channel is opened, and the fluid in the cannula 2 can be a plugging agent, such as cement. The plugging agent can flow to the squeezing device 101 through the squeezing channel and reach the wellbore and the formation, so that the fluid is pushed into the formation to achieve cement squeezing and sealing the reservoir or plugging operations.

[0040] In this embodiment, the sealing plug 102 is configured to form a seal with the wellbore wall, and is used to block a specific layer / area in the oil well to achieve fluid isolation and control. The fluid in the cannula 2 can be water, oil or gas or a mixture thereof, which is connected to the bridge plug assembly, and can convert the cannula bridge plug into a bridge plug to achieve the plugging function. Among them, the bottom outer side of the sealing plug 102 is designed with a chamfer, and a concave blind hole is designed in the direction parallel to the central axis of the cannula 2.

[0041] In this embodiment, the suspension lower joint 103 can be understood as a device that connects the lower measure string and the upper bridge plug assembly, which usually has a strong bearing capacity and sealing performance. Its lower part is connected to the measure string through a thread, and the intubated bridge plug can be converted into a suspension drop packer to realize suspension plugging construction, and realize sand control, plugging, gas lift and other operation requirements. As a specific explanation of this embodiment, when the measure string is a sand control tool, it can be used for sand control operations; when the measure string is a plugging tool, it can be used for plugging operations; when the measure string is a gas lift tool, it can be used for gas lift operations.

[0042] It needs to be explained that bridge plugs and suspended drop packers are both common downhole operation tools, and their specific working processes and principles can be referred to.

[0043] It should be noted that the squeezing device 101 of the present invention may include a sealing seat 37, a trapezoidal sealing ring 38, a spring seat 39, a spring 40 and a sealing valve stem 41. The lower outer sleeve 32 is connected to the sealing seat 37 by threads, and the inner side of the sealing seat 37 is designed with an inner chamfer of a certain angle and a trapezoidal sealing ring 38, and the lower part is connected to the spring seat 39 by threads. The spring seat 39 is designed to be U-shaped, the opening of the U-shaped spring seat 39 faces the squeezing device 101, and the end opposite to the opening is provided with a plurality of evenly arranged circular second through holes, and the side wall adjacent to the opening is provided with a plurality of keyway-shaped second side holes, and the sealing valve stem 41 is arranged in the U-shaped cavity, and the sealing valve stem 41 is designed to be T-shaped, and the spring 40 is sleeved on the sealing valve stem 41, and the transverse section of the T-shaped sealing valve stem 41 seals the opening of the U-shaped spring seat 39, and the vertical section of the T-shaped sealing valve stem 41 is placed in the cavity of the U-shaped spring seat 39 to achieve positioning and fixing, and ensure the effect of the spring 40.

[0044] like Figure 1 As shown, when the intubation bridge plug is arranged transversely, the spring seat 39 can be regarded as a left-inverted U-shape with the opening facing the left end, and the sealing valve stem 41 can be regarded as a left-inverted T-shape with the transverse section facing the left end.

[0045] In some embodiments, the upper end of the transverse section of the T-shaped sealing valve stem 41 is designed with an arc-shaped external chamfer, and the sealing valve stem 41 contacts the inner shoulder of the sealing seat 37 under the action of the spring 40 to achieve line sealing between the sealing valve stem 41 and the sealing seat 37, and between the sealing valve stem 41 and the trapezoidal sealing ring 38, ensuring the double sealing effect of steel to steel and steel to rubber. Among them, the design combination of the spring 40 and the sealing valve stem 41 realizes the pressure-squeezing sealing operation and the cement anti-spitting function, ensuring the construction safety.

[0046] In this way, during the operation, by replacing the functional module assembly at the bottom of the pipe bridge plug (three modules with different purposes, namely, the squeezing device 101, the sealing plug 102 and the hanging lower joint 103), it is converted into a bridge plug or a hanging drop-out packer, which can realize different purposes such as squeezing sealing, hanging and plugging, thereby solving the problem that the pipe bridge plug in the prior art has a single purpose and cannot simultaneously realize multiple different purposes such as plugging the reservoir, hanging the tail pipe and plugging, and has poor economic benefits.

[0047] Existing pipe-inserted bridge plugs or packers are generally split structures. The operations of lowering, setting, releasing, checking, and squeezing and plugging the pipe string require multiple lifting and lowering of the pipe string. The process is cumbersome, the risk is high, the construction period is long, and the operation cost is high. At the same time, each type of bridge plug or pipe-inserted bridge plug requires matching special setting tools and fishing tools. There are many types of tools, high costs, complex processing and assembly, and difficulty in management and use. In view of this, the present invention proposes a new technical solution:

[0048] The present embodiment is used to illustrate the bridge plug assembly, wherein the bridge plug assembly includes an upper joint 3, an outer center tube 5, a protective bowl 7, an upper rubber cylinder 8, an upper cone 9, a slip sleeve 10, a split slip 11, a hoop spring 12, a lower cone 13, a positioning pin 14, a limit pin 42, a lower rubber cylinder 15, a lower rubber cylinder seat 16, a setting piston 17, a lower joint 19, an upper piston sleeve 20, a locking ring 21, an unsealing pin 22, a support ring 23, a locking sleeve 24, a shear pin sleeve 25, a setting pin 26, a connecting joint 27, a lower piston sleeve 28, a positioning locking block 29, a release piston 30, a release pin 31 and the lower outer sleeve 32 mentioned above.

[0049] Specifically, the upper joint 3 is sleeved on the upper end of the outer central tube 5, and the two are connected by threads. In some embodiments, sealing can be achieved by a sealing assembly device. The inner side of the upper end of the upper joint 3 is designed with a chamfer of a certain angle to facilitate accurate positioning of the salvage tool during the salvage process. A sealing assembly device is designed below the chamfer. The upper joint 3 and the cannula 2 can be positioned by an external shoulder designed on the cannula 2.

[0050] The upper cone 9, the slip sleeve 10, the split slip 11, the hoop spring 12, and the lower cone 13 are the seat clamping mechanism. The lower part of the upper joint 3 and the outer side of the outer center tube 5 are sequentially provided with the protective bowl 7, the upper rubber cylinder 8, the protective bowl 7, the seat clamping mechanism, the protective bowl 7, the lower rubber cylinder 15, the protective bowl 7 and the lower rubber cylinder seat 16 from top to bottom. In the seat clamping mechanism, the lower end of the upper cone 9 and the upper end of the lower cone 13 are designed as slopes with a certain inclination angle, and the upper cone 9 is positioned by the outer convex shoulder on the outer center tube 5. The outer sides of the upper cone 9 and the lower cone 13 are provided with an integral slip sleeve 10, and the upper cone 9, the lower cone 13 and the slip sleeve 10 are connected by several limit pins 42 fixed on the outer walls of the upper cone 9 and the lower cone 13. The slip sleeve 10 has several split slips 11 built in, and the split slips 11 are arranged in a circular shape and fixed by a hoop.

[0051] In some embodiments, the inner sides of both ends of the split slip 11 are designed to have a slope with a certain angle, and the slopes on the upper cone 9 and the lower cone 13 are installed corresponding to the inclined slopes of the split slip 11. The outer wall of the split slip 11 is designed with isosceles triangle saw teeth. The side opposite to the inclined surface of the lower cone 13 is designed with several circular threaded holes at 90° to the axial direction, and the positioning pins 14 are several cylinders with threads on the surface. The positioning pins 14 pass through the threaded holes on the lower cone 13 and are matched and installed in the pin grooves of the outer center pipe 5 to connect and fix the outer center pipe 5 to the lower cone 13.

[0052] The positioning pin 14 can prevent the tool from getting stuck in advance due to the impact force during the well entry process. The middle part of the outer center pipe 5 is designed with a convex shoulder, and the upper cone 9 is sleeved on the shoulder of the outer center pipe 5, which can prevent the upper cone 9 from getting stuck in advance during the well entry process, reducing safety hazards.

[0053] In some embodiments, the setting piston 17, the lower joint 19, the upper piston sleeve 20, the locking ring 21, the unsealing pin 22, the support ring 23, the locking sleeve 24, the shear pin sleeve 25, the setting pin 26 and the connecting joint 27 are used as the setting mechanism, the lower part of the lower rubber cylinder seat 16 is provided with the upper piston sleeve 20, and the lower part of the upper piston sleeve 20 is provided with the locking sleeve 24, which are connected by threads. The setting piston 17 is placed between the upper piston sleeve 20 and the outer center tube 5. The setting piston 17 is sleeved on the upper part of the liquid inlet hole at the lower end of the outer center tube 5, and the lower end of the liquid inlet hole is the external thread of the outer center tube 5, which is connected to the lower joint 19 through the external thread. The lower joint 19 is placed between the upper piston sleeve 20 and the cannula 2.

[0054] The lower joint 19 is designed with multiple external shoulders, and the lock ring 21 is sleeved on the external shoulders of the lower joint 19. The outer circle of the lock ring 21 is designed with a sawtooth thread inclined at a certain angle. The support ring 23 is sleeved on the lower joint 19 and placed at the lower part of the lock ring 21. The support ring 23 is installed on the lower joint 19 through multiple unsealing pins 22. The inner side of the lock sleeve 24 is designed with a sawtooth thread inclined at a certain angle, and the inclination angle of the lock ring 21 is consistent with that of the lock sleeve 24. A shearing pin sleeve 25 is arranged at the lower part of the lock sleeve 24, and a plurality of threaded holes are designed on the shearing pin sleeve 25. The setting pin 26 passes through the threaded holes on the shearing pin sleeve 25 and is installed in the pin groove of the connecting joint 27.

[0055] In some embodiments, the lower piston sleeve 28, the positioning lock block 29, the release piston 30, and the release pin 31 are used as the release mechanism. The lower part of the lower joint 19 is provided with a connecting joint 27, and the connecting joint 27 is designed with an outer shoulder, and the outer shoulder is designed with several square through holes. Several cubic positioning lock blocks 29 pass through the square through holes and are placed in the concave shoulder of the central tube of the plug 2. The positioning lock block 29 is used to connect the plug assembly and the bridge plug assembly. The outer side of the connecting joint 27 is provided with a release piston 30, and the release piston 30 is placed in the lower piston sleeve 28. The release piston 30 and the lower piston sleeve 28 are connected and fixed by several release pins 31. The lower end of the lower piston sleeve 28 is designed with a pressure balance hole to balance the pressure difference in the wellbore.

[0056] In this embodiment, when the well reaches the designed depth, the oil pipe is under pressure, and the high-pressure fluid enters the insert pipe 2 and flows to the annular gap between the insert pipe 2 and the outer center pipe 5, and enters the space where the setting piston 17 is located through the liquid inlet hole of the outer center pipe 5. The high-pressure fluid directly enters the space where the release piston 30 is located through the insert pipe 2. The axial diameter of the above space is usually 2 mm (not shown in the figure).

[0057] When a certain pressure is reached, due to the fixing effect of the support ring 23, the setting piston 17 in the space has an upward trend, cutting off the setting pin 26, pushing the setting piston 17, the upper piston sleeve 20, the locking sleeve 24 and the lower rubber cylinder seat 16 upward, compressing the lower rubber cylinder 15. After the lower rubber cylinder 15 is compressed for a certain distance, the positioning pin 14 is cut off, pushing the lower cone 13 upward to achieve the seated jam. During the seated jam, the upper rubber cylinder 8 continues to be compressed, completing the rubber cylinder seated and the seated jam anchoring of the slip. Among them, the locking sleeve 24 moves upward to engage with the locking ring 21. When the rubber cylinder is seated and the slip is completely seated, it stops moving upward to ensure the stability of the seated jam.

[0058] When the pressure continues to increase to a certain value, due to the fixing effect of the positioning locking block 29, the release piston 30 in the space has a downward trend, the release piston 30 moves downward to cut off the release pin 31 and break away from the positioning locking block 29, the positioning block is freed from the restraint and falls freely into the space where the release piston 30 is located, and the insertion tube assembly and the bridge plug assembly are released.

[0059] The hydraulic pressure continues to increase, the fluid in the cannula 2 shears off the plug pin 34, the plug 35 falls to the bottom of the cannula 2, the squeezing channel is opened, and then the squeezing measure operation is carried out without moving the pipe string.

[0060] The cannula drop injection device is connected to the lower part of the cannula 2, and may include a plug pin 34, a plug 35, and a guide head 36. The guide head 36 is connected to the lower end of the cannula 2 by a thread, and the bottom end of the guide head 36 is in an arc shape, and a plurality of evenly distributed first through holes are arranged in a direction parallel to the axis. The outer wall of the lower end of the cannula 2 is designed with a plurality of first side holes in the shape of keyways, and a plug 35 is arranged on the inner side of the upper part of the first side hole, and the cannula 2 and the plug 35 are connected and fixed by a plurality of plug pins 34.

[0061] After the squeezing channel is opened, cement passes through the central channel in the insert tube 2, through the first side hole and the first through hole of the guide head 36, and enters the squeezing device 101. The compression spring 40 pushes open the sealing valve stem 41, and the cement passes over the second side hole and the second through hole of the spring seat 39 to reach the wellbore and the formation. The pressure continues to increase to a certain value, and the fluid is pushed into the formation, realizing the pressurized squeezing and sealing operation of the reservoir.

[0062] The intubation bridge plug provided by the present invention has simple process operation. By replacing the squeezing device 101, the sealing layer plug 102 and the hanging lower joint 103, it is converted into a bridge plug or a hanging release packer, and can be used for squeezing, hanging, carding and other different purposes. The integrated design of setting and releasing eliminates the need for special setting tools, and it can be salvaged with conventional general salvage tools, thereby simplifying the difficulty of processing, assembly, management and use.

[0063] In some embodiments, the positioning lock block 29 is designed as a plurality of cubes with uniform thickness, with chamfers on both sides of the upper end, and is located in the space formed by the cannula 2, the connecting joint 27 and the release piston 30. Due to the effect of the chamfer, the contact area between the positioning lock block 29 and the cannula 2 is reduced, thereby reducing the friction between the positioning lock block 29 and the cannula 2. The smaller contact area can reduce the area where the fluid adheres to the surface of the positioning lock block 29, reduce the local pressure, and thus reduce the viscous resistance of the fluid on the positioning lock block 29, thereby reducing the degree of fluid adhesion. The chamfer design makes the positioning lock block 29 easier to slide or fall off, thereby facilitating the release of the cannula assembly and the bridge plug assembly.

[0064] It should be noted that the axial direction mentioned in this article can be the length direction of the tube 2, or it can be said to be the height direction of the tube 2; the tail end can be the bottom in the height direction, the lower part can be the direction closer to the formation in the height direction; the upper part can be the direction farther away from the formation in the height direction, the upward direction can be the movement in the axial direction away from the formation; the downward direction can be the movement in the axial direction along the direction close to the formation.

[0065] It can be understood that, as the pressure continues to increase, the shear force of the release pin 31 is greater than the shear force of the setting pin 26 , so that the setting pin 26 is sheared off from the release pin 31 first.

[0066] In some embodiments, the intubation bridge plug includes a sealing assembly, which includes at least a first sealing mechanism, a second sealing mechanism 4 and a third sealing mechanism; wherein the first sealing mechanism includes a plurality of O-rings, and a plurality of O-rings are respectively arranged at the matching gaps on the intubation assembly, the bridge plug assembly and the functional module assembly; the second sealing mechanism 4 is arranged between the upper joint 3 and the intubation tube 2, and includes an array of a first trapezoidal polytetrafluoroethylene sealing ring 411, a trapezoidal rubber sealing ring 412 and a second trapezoidal polytetrafluoroethylene sealing ring 413 connected in sequence; the third sealing mechanism includes a trapezoidal sealing ring 38, which is located between the sealing seat 37 and the spring seat 39.

[0067] Reference Figure 4 As shown, Figure 4 It is a cross-sectional view of the overall structure of the second sealing mechanism 4. In this embodiment, the first sealing mechanism may include a first O-ring 6, a second O-ring 18, a third O-ring 33 and other O-rings, which are respectively arranged at the matching gaps on the cannula assembly, the bridge plug assembly and the functional module assembly. Among them, the matching gap can be understood as the gap between certain adjacent parts constituting the cannula assembly, and / or the gap between certain adjacent parts constituting the bridge plug assembly, and / or the gap between certain adjacent parts constituting the functional module assembly, and / or the gap between certain adjacent parts among the cannula assembly, the bridge plug assembly and the functional module assembly.

[0068] Exemplarily, in some embodiments, the sealing between the sealing layer thread plug 102 and the lower outer sleeve 32 can be achieved by an O-ring mounted on the sealing layer thread plug 102; in some embodiments, the sealing between the suspension lower joint 103 and the lower outer sleeve 32 can be achieved by an O-ring mounted on the suspension lower joint 103; in some embodiments, the sealing between the insert 2 and the plug 35 can be achieved by a third O-ring 33; in some embodiments, the sealing between the setting piston 17 and the upper piston sleeve 20, and between the setting piston 17 and the outer center tube 5 can be achieved by a second O-ring 18; in some embodiments, the sealing between the connecting joint 27, the release piston 30 and the lower piston sleeve 28 can be achieved by an O-ring; in some embodiments, the sealing between the outer center tube 5 and the upper joint 3 can be achieved by a first O-ring 6.

[0069] Preferably, the upper joint 3 is frequently plugged in and out and is prone to wear, and a seal is achieved between the upper joint 3 and the cannula 2 through the second sealing mechanism 4. Specifically, the inner side of the upper end of the upper joint 3 is designed with a chamfer of a certain angle, and a second sealing mechanism 4 is designed below the chamfer. The second sealing mechanism 4 is composed of an array of wear-resistant first trapezoidal polytetrafluoroethylene sealing rings 411, high-temperature and oil-resistant trapezoidal rubber sealing rings 412, and second trapezoidal polytetrafluoroethylene sealing rings 413 from top to bottom, and has high wear resistance and high temperature resistance, achieving efficient and reliable sealing between the upper joint 3 and the cannula 2.

[0070] The combination of the first trapezoidal polytetrafluoroethylene seal ring 411, the trapezoidal rubber seal ring 412, and the second trapezoidal polytetrafluoroethylene seal ring 413, the first trapezoidal polytetrafluoroethylene seal ring 411 and the second trapezoidal polytetrafluoroethylene seal ring 413 as hard sealing elements, can withstand greater pressure and friction to ensure sealing performance, and the trapezoidal rubber seal ring 412 as a soft sealing element, has good sealing elasticity and adaptability, and can well compensate for the hard sealing element to adapt to temperature changes and external stress. Therefore, the alternating use of hard and soft sealing elements can make full use of their respective characteristics and ensure the stability and reliability of sealing performance in the bottom hole environment.

[0071] The method for using a modular intubation bridge plug provided by the present invention is as follows:

[0072] Sealing and locking: After a modular intubation bridge plug is lowered to the designed well depth, the oil pipe is under pressure, and the high-pressure liquid reaches the space where the setting piston 17 and the release piston 30 are located. When the liquid pressure reaches a certain value, the setting pin 26 is sheared off, and the high pressure in the cavity of the setting piston 17 pushes the setting piston 17, the upper piston sleeve 20 and the locking sleeve 24 upward, pushing the lower rubber cylinder seat 16 upward to compress the lower rubber cylinder 15. After the lower rubber cylinder 15 is compressed for a certain distance, the positioning pin 14 is sheared off, pushing the lower cone 13 upward to achieve seating and locking. During the seating and locking process, the upper rubber cylinder 8 continues to be compressed. When the pressure reaches a certain value, the rubber cylinder seating of the bridge plug and the seating and anchoring of the slips are completed.

[0073] Release: When the hydraulic pressure continues to increase and reaches a certain value, the pressure at the release piston 30 shears the release pin 31, the release piston 30 moves downward, and the positioning lock block 29 is freed from the restraint and falls freely into the space where the release piston 30 is located. As the hydraulic pressure continues to increase, the plug pin 34 between the cannula 2 and the plug 35 is sheared, the pressure drops suddenly, and the plug 35 falls to the upper part of the guide head 36.

[0074] Sealing verification: After the bridge plug is seated and stuck, hydraulic pressure is pumped forward in the tubing or pressure is applied to the annulus between the tubing and casing. The sealing of the bridge plug is verified by observing the pressure changes in the annulus between the wellhead and casing.

[0075] Squeeze and seal: When the lower outer sleeve 32 is connected to the squeezing device 101, cement is pumped into the oil pipe through the pump truck. The cement passes through the central channel in the insert 2, through the first side hole and the first through hole of the guide head 36, and the compression spring 40 pushes open the sealing valve stem 41. The fluid passes through the second side hole and the second through hole of the spring seat 39 and reaches the wellbore and the formation. The pressure continues to increase to a certain value, and the fluid is pushed into the formation to realize the pressurized squeeze and seal operation of the reservoir.

[0076] Pulling out the plug-in pipe string: After the squeeze and seal is completed, the tubing is lifted up to pull out the plug-in pipe string of a modular plug-in bridge plug. The packer after being released can be permanently left in the well to isolate the wellbore and achieve sealing, or it can be fished out of the well using conventional general fishing tools.

[0077] In the above process, the devices connected to the lower outer sleeve 32 (three different functional modules, namely, the squeezing device 101, the sealing plug 102 and the hanging lower joint 103) can be replaced to achieve multiple uses, and the operation is simple and convenient. When the lower outer sleeve 32 is connected to the squeezing device 101, a high-pressure squeezing plugging agent construction of the intubation bridge plug is realized in one trip of the pipe string; when the lower outer sleeve 32 is connected to the sealing plug 102, the bridge plug sealing construction is realized; when the lower outer sleeve 32 is connected to the hanging lower joint 103, the hanging release packer is realized to realize the hanging and plugging construction, which is used for sand control, pollution prevention, gas lift, plugging and other measures.

[0078] Thus, the modular intubation bridge plug provided by the present invention adopts hydraulic pressure for setting, and the construction is safe and reliable, and the pressure bearing capacity of the packer is high and is not limited by the size of the well inclination. One trip of tubing is used to realize the operation of the bridge plug entering the well, setting, checking the seal and taking measures. During the operation, by replacing the functional module assembly at the bottom of the intubation bridge plug, it is converted into a bridge plug or a hanging and releasing packer to achieve different uses such as squeeze sealing, suspension, and card sealing. The integrated design of setting and releasing eliminates the special setting tools and uses conventional general salvage tools for salvage, simplifying the difficulty of processing, assembly, management and use. The construction operation is simple, which saves the number of tubing operations downhole, shortens the construction period, and improves economic efficiency. The tool can be used in highly deviated wells and horizontal wells, and has broad application prospects.

[0079] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0080] It should also be noted that, in this article, the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations, nor can they be understood as indicating or implying relative importance. Moreover, the term "include" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device.

[0081] The above is a detailed introduction to a modular intubation bridge plug provided by the present application. The principles and implementation methods of the present application are described in detail using specific examples. The description of the above embodiments is only used to help understand the present application, and the content of this specification should not be understood as limiting the present application. At the same time, for those skilled in the art, according to the present application, there will be different forms of changes in the specific implementation methods and application scopes. It is not necessary and impossible to list all the implementation methods here, and the obvious changes or modifications derived therefrom are still within the protection scope of the present application.

Claims

1. A modular intubation bridge plug, characterized in that: It includes a cannula assembly, a bridge plug assembly and a functional module assembly, wherein the functional module assembly is characterized by achieving different functions by replacing different devices; wherein, The cannula assembly comprises a cannula and a cannula drop-and-drop injection device connected to the lower part of the cannula, and the cannula drop-and-drop injection device is configured to open and close the outlet of the cannula; The bridge plug assembly is movably sleeved on the outer periphery of the cannula assembly, the bridge plug assembly is configured to achieve plugging construction, and the lower part of the bridge plug assembly is detachably connected to the functional module assembly; The functional module assembly includes any one of an extrusion device, a sealing plug and a hanging lower joint. When the bridge plug assembly is connected to the extrusion device, high-pressure extrusion plugging agent construction is realized; when the bridge plug assembly is connected to the sealing plug, bridge plug sealing construction is realized; when the bridge plug assembly is connected to the hanging lower joint, hanging card sealing construction is realized.

2. A modular pipe-insertion bridge plug according to claim 1, characterized in that: The bridge plug assembly comprises an outer central tube, the outer central tube is provided with a liquid inlet hole, and the outer side of the outer central tube is sequentially provided with an upper joint, an upper rubber cylinder, a seating mechanism, a lower rubber cylinder, a lower rubber cylinder seat, a sealing mechanism and a release mechanism from top to bottom; wherein, The seat mechanism comprises an upper cone, a split slip and a lower cone, wherein the split slip is located between the upper cone and the lower cone, and the lower cone is connected to the outer center tube via a positioning pin; The setting mechanism includes a setting piston, an upper piston sleeve, a lower joint, a shear pin sleeve and a connecting joint. The setting piston is located between the upper piston sleeve and the outer center tube and is adjacent to the liquid inlet hole. A support ring is installed on the lower joint. The connecting joint is connected to the shear pin sleeve through a setting pin.

3. A modular pipe-insertion bridge plug according to claim 2, characterized in that: The release mechanism comprises a plurality of positioning locking blocks, a lower piston sleeve and a release piston. The positioning locking blocks are located in a space formed by the insert pipe, the connecting joint and the release piston. The release piston is connected to the lower piston sleeve via a release pin.

4. A modular pipe-insertion bridge plug according to claim 2, characterized in that: The sealing mechanism comprises a locking sleeve and a locking ring. The locking sleeve is arranged at the lower part of the upper piston sleeve, and the locking ring is sleeved on the lower joint and located at the upper part of the support ring.

5. A modular pipe-insertion bridge plug according to claim 2, characterized in that: Both ends of the side of the positioning locking block contacting the insertion tube are chamfered.

6. A modular pipe-inserted bridge plug according to claim 2, characterized in that: The inner sides of both ends of the split slip are sloped surfaces, the upper cone and the lower cone are respectively provided with inclined surfaces fitting the sloped surfaces, and the outer wall of the split slip is designed with a plurality of isosceles triangle saw teeth.

7. The modular intubation bridge plug according to claim 1, characterized in that: The cannula drop-and-drop injection device includes a plug and a guide head, the guide head is connected to the bottom of the cannula, the bottom end of the guide head is provided with a plurality of first through holes along the axial direction of the cannula, the side wall of the cannula is provided with a plurality of keyway-shaped first side holes, the inside of the cannula is provided with the plug corresponding to the upper part of the first side hole, and the cannula and the plug are connected by a plurality of plug pins.

8. The modular intubation bridge plug according to claim 1, characterized in that: The squeezing device includes a sealing seat, a spring seat, a spring and a sealing valve stem. The sealing seat is connected to the bridge plug assembly and the spring seat respectively. The bottom end of the spring seat is provided with a plurality of second through holes, and the side wall is provided with a plurality of second side holes in the shape of key grooves. The spring seat is open on one side close to the sealing seat and has a cavity inside. A T-shaped sealing valve stem is provided in the cavity. A spring is provided on the outer peripheral sleeve of the T-shaped sealing valve stem. The transverse section of the T-shaped sealing valve stem movably seals the opening.

9. A modular pipe-insertion bridge plug according to any one of claims 1 to 8, characterized in that: The intubation bridge plug comprises a sealing assembly, wherein the sealing assembly comprises at least a first sealing mechanism, a second sealing mechanism and a third sealing mechanism; wherein, The first sealing mechanism includes a plurality of O-type sealing rings, and the plurality of O-type sealing rings are respectively arranged at matching gaps on the cannula assembly, the bridge plug assembly and the functional module assembly; The second sealing mechanism is provided between the upper joint and the cannula, and comprises a first trapezoidal polytetrafluoroethylene sealing ring, a trapezoidal rubber sealing ring and a second trapezoidal polytetrafluoroethylene sealing ring connected in sequence in an array; The third sealing mechanism comprises a trapezoidal sealing ring, which is located between the sealing seat and the spring seat.

10. A modular pipe-inserted bridge plug according to claim 9, characterized in that: Both ends of the transverse section of the T-shaped sealing valve stem have arc-shaped outer chamfers, so that the T-shaped sealing valve stem abuts against the inner shoulder of the sealing seat and the trapezoidal sealing ring respectively.

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