Water absorption measuring, squeezing and sealing and releasing integrated pipe column and construction method

Abstract

The invention relates to the technical field of downhole tools, in particular to a water absorption measuring, squeezing and sealing and releasing integrated pipe column and a construction method. The water absorption measuring, squeezing and sealing and releasing integrated pipe column comprises an oil pipe, a safety connector, a packer and a cement retainer which are sequentially connected from top to bottom; the method comprises the following steps that (1) after an oil pipe, a safety connector, a packer and a cement retainer are sequentially connected from top to bottom, a connected pipe column is lowered into a well to the position above a squeezing and sealing layer section; the double-packing structure of the packer and the cement retaining device is reasonable and compact in structure and ingenious in conception, by the adoption of the double-packing structure of the packer and the cement retaining device, the packer descends to the position between an upper-section extrusion sealing layer and a lower-section extrusion sealing layer through an oil pipe, water absorption of the upper-section extrusion sealing layer and the lower-section extrusion sealing layer can be measured after setting, the setting position of the cement retaining device can be adjusted after the packer is unsealed, and the sealing effect is good. The operation is continuous, water absorption measurement, squeezing and sealing and tool releasing can be completed by one tubular column, and the tubular column has the characteristics of rapidness, stability and high efficiency.

Description

Technical Field

[0001] This invention relates to the field of downhole tool technology, and is an integrated tubing string and construction method for measuring water absorption, squeezing and sealing, and releasing the tool. Background Technology

[0002] Cementing operations in oilfields utilize liquid pressure to force cement slurry into the annulus where sealing is required, or into formation fractures and pores, to isolate oil and gas layers. It can also be used to plug blast holes and seal casing leaks. Currently, two common cementing processes in the petroleum industry are: one uses a cement retainer, where the cement retainer is lowered to the top of the target formation using drill pipe or tubing, and cement is directly squeezed from the water inlet of the tubing string; the other uses a wellhead shut-in cementing system, where drill pipe or tubing is lowered to the expected well depth, a certain amount of cement slurry is pumped in to replace the drilling fluid, the tubing string is pulled out to the cement surface, excess cement slurry is circulated out, and then the wellhead is closed. A certain amount of drilling fluid is then squeezed into the water inlet of the tubing string to force the cement slurry into the formation to isolate oil, gas, and water layers. The cement retainer extrusion sealing operation first involves lowering a mechanical packer to measure the formation water absorption of the extrusion sealing section. Based on the formation water absorption, the extrusion sealing operation method is selected. If the formation has good water absorption, the cement retainer is lowered into the extrusion sealing section to carry out the extrusion sealing construction. This greatly increases the extrusion sealing operation cycle. At the same time, if the wellbore and tubing are not cleaned properly, the extrusion sealing insertion pipe cannot effectively open the cement retainer slide valve, affecting the mechanical sealing. The cement extrusion sealing efficiency is low, the construction cycle is long, and the cost is high. Summary of the Invention

[0003] This invention provides an integrated tubular column for measuring water absorption, sealing, and tool release, as well as a construction method thereon. It overcomes the shortcomings of the prior art and effectively solves the problem that existing cement extrusion operations cannot complete water absorption measurement, sealing, and tool release in one trip using the tubular column.

[0004] One of the technical solutions of this invention is achieved through the following measures: an integrated tubing string for measuring water absorption, sealing, and releasing, comprising, from top to bottom, an oil pipe, a safety joint, a packer, and a cement retainer. The cement retainer includes an upper joint, an outer cylinder, an inner central tube, an outer central tube, a conical ball cage, a ball seat sleeve, a valve body, a closing valve sleeve, a setting assembly, and a hydraulic starting assembly. The outer cylinder is fixedly installed on the outer side of the lower end of the upper joint, and the inner central tube is fixedly installed on the inner side of the lower end of the upper joint. The conical ball cage is fixedly installed on the lower end of the inner central tube, and a ball seat sleeve is fixedly installed on the inner side of the upper part of the conical ball cage by a closing shear pin. A retaining ring is fixedly installed on the inner side of the lower end of the conical ball cage. An outer central tube, with its lower end located outside the middle of the conical ball cage, is fixedly installed on the outer side of the lower part of the inner central tube by a releasing shear pin. A setting assembly is provided on the outer side of the upper end of the outer central tube. The sealing assembly has a hydraulic starting component on the outer side of the inner central tube corresponding to the position between the upper connector and the setting assembly, which can set the setting assembly after downward movement. The upper part of the hydraulic starting component is fixedly installed with the lower part of the outer cylinder by starting shear pins. At least one starting fluid hole is provided on the inner central tube of the hydraulic starting component. A sleeve valve body is fixedly installed on the outer side of the lower end of the outer central tube. Several external fluid passage holes are provided on the outer side of the upper part of the sleeve valve body. Several internal fluid passage holes are provided on the outer side of the lower part of the conical ball cage corresponding to the position of the external fluid passage holes. A converging sleeve is provided in the sleeve valve body below the position of the external fluid passage holes. Several radially inwardly contracting claws are provided on the upper side of the converging sleeve at circumferential intervals. A closing valve sleeve with its upper end located on the outer side of the middle part of the conical ball cage is provided on the outer side of the upper part of the closing valve sleeve. A release ring groove is provided on the inner side of the upper part of the closing valve sleeve, which can cause the converging claws to expand radially outward.

[0005] The following are further optimizations and / or improvements to one of the above-mentioned technical solutions: The aforementioned hydraulic starting assembly may include a cylinder liner, an upper piston, a lower piston, a connecting sleeve, and an abutment sleeve. The inner central tube includes an upper central tube and a lower central tube. The starting fluid port includes an upper fluid passage port and a lower fluid passage port. The cylinder liner with its lower end located below it is fixedly installed on the inner side of the outer cylinder body by a starting shear pin. The lower piston with its lower end located below it is fixedly installed on the inner side of the lower end of the cylinder liner. The abutment sleeve with its lower end abutting against the upper side of the setting assembly is fixedly installed on the outer side of the lower end of the lower piston. A connecting sleeve is provided in the cylinder liner corresponding to the position above the lower piston. The upper central tube is fixedly installed on the inner side of the upper end of the connecting sleeve. The lower central tube is fixedly installed on the inner side of the lower end of the connecting sleeve. The upper piston is fixedly installed on the inner side of the upper end of the cylinder liner. A hydraulic ring groove is provided on the inner side of the upper end of the upper piston. An upper fluid passage port with internal and external penetration is provided on the upper central tube corresponding to the position of the hydraulic ring groove. A lower fluid passage port with internal and external penetration is provided on the lower central tube corresponding to the position between the connecting sleeve and the lower piston.

[0006] The above may also include O-rings, with at least one O-ring spaced vertically between the upper piston and the upper central tube, at least one O-ring spaced vertically between the hydraulic cylinder liner and the outer cylinder corresponding to the upper piston position, at least one O-ring spaced vertically between the connecting sleeve and the hydraulic cylinder liner, at least one O-ring spaced vertically between the lower piston and the lower central tube, at least one O-ring spaced vertically between the lower piston and the hydraulic cylinder liner; at least one O-ring spaced vertically between the lower outer side of the lower central tube and the inner side of the outer central tube, at least one O-ring spaced vertically between the ball seat sliding sleeve and the cone ball cage, at least one O-ring spaced vertically between the upper part of the converging sleeve and the sleeve valve body, at least one O-ring spaced vertically between the lower part of the converging sleeve and the sleeve valve body, and at least one O-ring spaced vertically between the closing valve sleeve and the sleeve valve body.

[0007] The aforementioned setting assembly may include, from top to bottom, an upper slip, an upper cone, a rubber sleeve assembly, a lower cone, and a lower slip located on the outer side of the upper part of the outer central tube. The lower end of the lower slip rests on the upper side of the sleeve valve body. The upper part of the upper cone is a frustum shape with a smaller upper part and a larger lower part. The inner side of the lower end of the upper slip is provided with a frustum hole that matches the upper part of the upper cone. The upper end of the upper cone is located on the inner side of the lower part of the upper slip. The lower part of the lower cone is a frustum shape with a larger upper part and a smaller lower part. The inner side of the upper end of the upper slip is provided with a frustum hole that matches the upper part of the lower cone. The lower end of the lower cone is located on the inner side of the upper part of the lower slip.

[0008] The above may also include a setting shear pin and a one-way anti-reverse assembly. The upper cone and the lower cone are both fixedly installed together with the outer center tube by the setting shear pin. The one-way anti-reverse assembly includes a locking ring, an outer anti-reverse tooth, and an inner anti-reverse tooth. An anti-reverse ring groove is provided on the inner side of the lower end of the upper cone. A locking ring is fixedly installed in the anti-reverse ring groove. At least one set of inner anti-reverse teeth is continuously provided on the inner side of the locking ring from top to bottom. The inner anti-reverse tooth is a truncated ring with a right-angled triangular cross-section, which is wider at the top and narrower at the bottom. An outer anti-reverse tooth matching the inner anti-reverse tooth is provided on the outer side of the upper part of the outer center tube corresponding to the locking ring position. The outer anti-reverse tooth is a truncated ring with a right-angled triangular cross-section, which is narrower at the top and wider at the bottom.

[0009] The aforementioned rubber sleeve assembly may include a current-carrying ring and an upper end ring, a rubber sleeve, and a lower end ring arranged sequentially from top to bottom. The rubber sleeve has an installation ring groove on its inner side in the middle, and a current-carrying ring is provided in the installation ring groove.

[0010] The second technical solution of the present invention is achieved through the following measures: a construction method using the above-mentioned integrated pipe string for measuring water absorption, sealing, and releasing water, comprising the following steps: (1) After connecting the tubing, safety joint, packer and cement retainer from top to bottom, the connected tubing string is lowered into the well to above the sealing layer; (2) After the tubing string is lowered to the predetermined position, the tubing string is lifted and then lowered and pressurized to anchor the packer's slips to the casing wall and longitudinally compress the packer's rubber sleeve to seal the annular space of the casing. Drilling fluid is injected into the tubing stably, and the formation water absorption is measured. After stopping the pump and releasing the pressure in the tubing, the tubing string is lifted, and the packer's rubber sleeve is retracted and unsealed. The water absorption of different extrusion sections is measured by pressing in both directions. (3) Adjust the position of the cement retainer and perform positive circulation well washing until the wellhead is clean and free of impurities. Then, put in the pressure-blocking ball, which falls into the ball seat sliding sleeve to block the central channel. (4) Continue pressurizing. The liquid enters the hydraulic ring groove through the upper liquid passage and pushes the upper piston down. It pushes the lower piston down through the lower liquid passage. Under the action of the upper and lower pistons, the starting shear pin is cut off, causing the outer cylinder and the abutment sleeve to move down and push the setting assembly. After the setting shear pin is cut off, the upper slip, the rubber sleeve assembly and the lower slip are set. (5) Continue to pressurize until the shear pin is cut off. The ball seat slides down to the upper side of the retaining ring fixedly installed on the inner side of the lower end of the cone ball cage, so that the central channel is connected to the annulus through the inner liquid passage and the outer liquid passage, and the squeezing and blocking channel is opened to carry out normal squeezing and sealing operations. (6) Lift the tubing column so that the upper end of the converging claw enters the release ring groove and expands radially outward. The converging sleeve seals the external liquid passage hole, closes the squeezing channel, and realizes pressurized condensation. (7) Perform reverse circulation well washing to replace the excess cement slurry in the tubing, and perform forward circulation well washing until the wellhead is clean and free of impurities; (8) Continue pressurizing until the shear pin breaks, then release the tubing string, shut in the well and wait for the concrete to set.

[0011] This invention features a reasonable and compact structure with ingenious design. By employing a double-packing structure consisting of a packer and a cement retainer, the packer is lowered through the tubing to the middle of the upper and lower extrusion layers. After setting, the water absorption of the upper and lower extrusion layers can be measured. After the packer is released, the setting position of the cement retainer is adjusted to complete the extrusion of the lower extrusion layer and tool release. The operation is continuous, allowing water absorption measurement, extrusion, and tool release to be completed in one run of tubing. It is characterized by speed, stability, and high efficiency. Attached Figure Description

[0012] Appendix Figure 1 These are schematic diagrams of the main sectional view structure of Examples 1 to 7.

[0013] Appendix Figure 2 For the appendix Figure 1 Schematic diagram of the main sectional view of the cement retainer.

[0014] Appendix Figure 3 For the appendix Figure 2 A schematic diagram of the front sectional view of the structure in use.

[0015] The codes in the attached diagram are as follows: 1 for oil pipe, 2 for safety joint, 3 for packer, 4 for upper joint, 5 for outer cylinder, 6 for upper center pipe, 7 for lower center pipe, 8 for outer center pipe, 9 for conical ball cage, 10 for ball seat sleeve, 11 for valve body, 12 for closing valve sleeve, 13 for retaining ring, 14 for convergence sleeve, 15 for convergence claw, 16 for release ring groove, 17 for starting shear pin, 18 for closing shear pin, 19 for release shear pin, 20 for setting shear pin, and 21 for hydraulic cylinder liner. 22 is the upper piston, 23 is the lower piston, 24 is the connecting sleeve, 25 is the abutment sleeve, 26 is the upper liquid inlet, 27 is the lower liquid inlet, 28 is the outer liquid passage, 29 is the inner liquid passage, 30 is the upper slip, 31 is the upper cone, 32 is the lower cone, 33 is the lower slip, 34 is the locking ring, 35 is the upper end ring, 36 is the rubber sleeve, 37 is the lower end ring, 38 is the flow-bearing ring, 39 is the hydraulic ring groove, 40 is the O-ring seal, 41 is the upper section extrusion seal layer, and 42 is the lower section extrusion seal layer. Detailed Implementation

[0016] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0017] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as the positional relationships of front, back, top, bottom, left, and right, which are based on the instructions attached. Figure 1 The orientation of the layout is determined by the direction of the map.

[0018] The present invention will be further described below with reference to embodiments and accompanying drawings: Example 1: As shown in the attached document Figure 1 , 2As shown in Figure 3, the integrated tubing string for measuring water absorption, sealing, and releasing includes, from top to bottom, an oil pipe 1, a safety joint 2, a packer 3, and a cement retainer. The cement retainer includes an upper joint 4, an outer cylinder 5, an inner central tube, an outer central tube 8, a conical ball cage 9, a ball seat sleeve 10, a sleeve valve body 11, a closing valve sleeve 12, a setting assembly, and a hydraulic starting assembly. The outer cylinder 5 is fixedly installed on the outer side of the lower end of the upper joint 4, and the inner central tube is fixedly installed on the inner side of the lower end of the upper joint 4. The conical ball cage 9 is fixedly installed on the lower end of the inner central tube. The ball seat sleeve 10 is fixedly installed on the inner side of the upper part of the conical ball cage 9 by a closing shear pin 18. A retaining ring 13 is fixedly installed on the inner side of the lower end of the conical ball cage 9. The outer central tube 8, located on the outer side of the middle of the conical ball cage 9, is fixedly installed on the outer side of the lower part of the inner central tube by a releasing shear pin 19. A setting assembly is provided on the outer side of the upper end of the outer central tube 8, corresponding to the upper joint 4 and the setting assembly. A hydraulic starting component is provided on the outer side of the inner central tube between the components, which can set the setting component after downward movement. The upper part of the hydraulic starting component is fixedly installed with the lower part of the outer cylinder 5 by starting shear pins 17. At least one starting fluid hole is provided on the inner central tube of the hydraulic starting component. A sleeve valve body 11 is fixedly installed on the outer side of the lower end of the outer central tube 8. Several external fluid passage holes 28 are provided on the outer side of the upper part of the sleeve valve body 11. Several internal fluid passage holes 29 are provided on the outer side of the lower part of the conical ball cage 9 corresponding to the position of the external fluid passage holes 28. A converging sleeve 14 is provided in the sleeve valve body 11 below the position of the external fluid passage holes 28. Several radially inwardly contracting claws 15 are provided on the upper side of the converging sleeve 14 at intervals along the circumference. A closing valve sleeve 12 with its upper end located on the outer side of the middle part of the conical ball cage 9 is provided on the outer side of the upper part of the converging claws 15. A release ring groove 16 that can make the converging claws 15 expand radially outward is provided on the inner side of the upper part of the closing valve sleeve 12.

[0019] During use, by adopting a double-sealing structure of packer 3 and cement retainer, packer 3 is lowered through oil pipe 1 to the middle of upper extrusion sealing layer 41 and lower extrusion sealing layer 42. After setting, water absorption can be measured in upper extrusion sealing layer 41 and lower extrusion sealing layer. After packer 3 is released, the setting position of cement retainer is adjusted to complete the extrusion sealing of lower extrusion sealing layer 42 and tool release. The operation is continuous, and water absorption measurement, extrusion sealing and tool release can be completed in one trip of tubing, thereby improving the efficiency of extrusion sealing operation and saving operation time and cost. By setting release ring groove 16, after the convergence sleeve 14 moves upward, the convergence claw 15 expands radially outward, so that the convergence sleeve 14 is suspended in the closing valve sleeve 12, closing the external liquid passage 28 and blocking the extrusion channel.

[0020] The usage process of this embodiment is as follows: First, lowering the tubing string: After connecting the tubing 1, safety joint 2, packer 3, and cement retainer from top to bottom, lower the connected tubing string into the well to above the extrusion zone. The safety joint 2 is connected to the tubing 1 with a reverse thread, and the packer 3 can be a Y211 model. Second, measuring water absorption: After the tubing string reaches the predetermined position, lower the tubing string and pressurize it with 80 to 100 kN to anchor the packer 3 slips to the casing wall and longitudinally compress the packer 3's rubber sleeve 36 to seal the annular space of the casing. Drilling fluid is stably injected into the tubing 1, and the formation water absorption is measured. After stopping the pump and releasing the pressure in the tubing 1, the tubing string is lifted, and the packer 3's rubber sleeve 36 is retracted and unsealed. The water absorption of different extrusion zones is measured by forward and reverse pressure testing. Third, extrusion sealing: Adjust the position of the cement retainer and perform forward circulation well washing until the wellhead is clean. After removing impurities, insert the pressure-holding ball and allow it to settle freely for 15 to 20 minutes. When the bottom pressure is high, a small-volume circulation method can be used to deliver the pressure-holding ball to the correct position. The pressure-holding ball falls into the ball seat sliding sleeve 10 to seal the central channel. After pressurization, the cement retainer is set. Continue pressurizing to 5 MPa and stabilize for 3 to 5 minutes, increasing by 5 MPa each time and stabilizing for 3 to 5 minutes, until the shear pin 18 is cut off. The ball seat sliding sleeve 10 then slides down, opening the plugging channel for plugging operations. Fourth step: Release: Raise the tubing string so that the upper end of the convergent claw 15 enters the release annular groove 16 and expands radially outward. The convergent sleeve 14 seals the external fluid passage 28, closing the plugging channel and achieving pressurized solidification. Perform reverse circulation well washing to replace excess cement slurry in the tubing string. Perform forward circulation well washing until the wellhead is clean and free of impurities. Continue pressurizing until the release shear pin 19 is cut off, achieving release. Pull out the tubing string and shut in the well for solidification.

[0021] The above-mentioned integrated tubing for measuring water absorption, sealing, and releasing can be further optimized and / or improved according to actual needs: Example 2: As shown in the attached document Figure 1 , 2As shown in Figure 3, the hydraulic starting assembly includes a cylinder liner 21, an upper piston 22, a lower piston 23, a connecting sleeve 24, and an abutment sleeve 25. The inner central tube includes an upper central tube 6 and a lower central tube 7. The starting fluid port includes an upper fluid passage port and a lower fluid passage port. The cylinder liner 21, with its lower end located below it, is fixedly installed on the inner side of the outer cylinder body 5 by a starting shear pin 17. The lower piston 23, with its lower end located below it, is fixedly installed on the inner side of the lower end of the cylinder liner 21. The abutment sleeve 25, with its lower end abutting against the upper side of the setting assembly, is fixedly installed on the outer side of the lower end of the lower piston 23. A connecting sleeve 24 is provided inside the hydraulic cylinder sleeve 21 above the lower piston 23. An upper central tube 6 is fixedly installed on the inner side of the upper end of the connecting sleeve 24, and a lower central tube 7 is fixedly installed on the inner side of the lower end of the connecting sleeve 24. An upper piston 22 is fixedly installed on the inner side of the upper end of the hydraulic cylinder sleeve 21. A hydraulic ring groove 39 is provided on the inner side of the upper end of the upper piston 22. An upper liquid passage hole with internal and external penetration is provided on the upper central tube 6 corresponding to the position of the hydraulic ring groove 39. A lower liquid passage hole with internal and external penetration is provided on the lower central tube 7 corresponding to the position between the connecting sleeve 24 and the lower piston 23. During use, the liquid enters the hydraulic ring groove 39 through the upper liquid passage hole and pushes the upper piston 22 downward. It pushes the lower piston 23 downward through the lower liquid passage hole. Under the action of the upper piston 22 and the lower piston 23, the shearing pin 17 is cut off, causing the outer cylinder 5 and the abutment sleeve 25 to move downward and push the setting seal assembly.

[0022] Example 3: As shown in the attached document Figure 1 , 2 As shown in Figure 3, it also includes O-ring seals 40. At least one O-ring seal 40 is provided vertically between the upper piston 22 and the upper central tube 6; at least one O-ring seal 40 is provided vertically between the hydraulic cylinder sleeve 21 corresponding to the upper piston 22 and the outer cylinder 5; at least one O-ring seal 40 is provided vertically between the connecting sleeve 24 and the hydraulic cylinder sleeve 21; at least one O-ring seal 40 is provided vertically between the lower piston 23 and the lower central tube 7; and at least one O-ring seal 40 is provided vertically between the lower piston 23 and the hydraulic cylinder sleeve 21. At least one O-ring 40 is provided between the lower outer side of the lower center tube 7 and the inner side of the outer center tube 8, spaced vertically. At least one O-ring 40 is also provided between the ball seat sliding sleeve 10 and the conical ball cage 9, spaced vertically. At least one O-ring 40 is provided between the upper part of the converging sleeve 14 and the valve body 11, spaced vertically. At least one O-ring 40 is also provided between the lower part of the converging sleeve 14 and the valve body 11, and at least one O-ring 40 is provided between the closing valve sleeve 12 and the valve body 11. This arrangement ensures the sealing between the components during use.

[0023] Example 4: As shown in the appendix Figure 1 , 2As shown in Figure 3, the setting assembly may include, from top to bottom, an upper slip 30, an upper cone 31, a rubber sleeve 36 assembly, a lower cone 32, and a lower slip 33 located on the outer side of the upper part of the outer central tube 8. The lower end of the lower slip 33 is seated on the upper side of the sleeve valve body 11. The upper part of the upper cone 31 is a frustum shape with a smaller upper part and a larger lower part. The inner side of the lower end of the upper slip 30 is provided with a frustum hole that matches the upper part of the upper cone 31. The upper end of the upper cone 31 is located on the inner side of the lower part of the upper slip 30. The lower part of the lower cone 32 is a frustum shape with a larger upper part and a smaller lower part. The inner side of the upper end of the upper slip 30 is provided with a frustum hole that matches the upper part of the lower cone 32. The lower end of the lower cone 32 is located on the inner side of the upper part of the lower slip 33.

[0024] Example 5: As shown in the attached document Figure 1 , 2 As shown in Figure 3, the assembly also includes a setting shear pin 20 and a one-way anti-reverse assembly. Both the upper cone 31 and lower cone 32 are fixedly installed together with the outer central tube 8 via the setting shear pin 20. The one-way anti-reverse assembly includes a locking ring 34, an outer anti-reverse tooth, and an inner anti-reverse tooth. An anti-reverse ring groove is provided on the inner side of the lower end of the upper cone 31, and the locking ring 34 is fixedly installed within the anti-reverse ring groove. At least one set of inner anti-reverse teeth is continuously provided on the inner side of the locking ring 34 from top to bottom. The inner anti-reverse tooth is a truncated ring with a right-angled triangular cross-section, wider at the top and narrower at the bottom. An outer anti-reverse tooth matching the inner anti-reverse tooth is provided on the outer side of the upper part of the outer central tube 8 corresponding to the position of the locking ring 34. The outer anti-reverse tooth is also a truncated ring with a right-angled triangular cross-section, narrower at the top and wider at the bottom. During use, the setting shear pin 20 prevents the upper slip 30 and lower slip 33 from prematurely setting; the one-way anti-reverse assembly prevents the upper cone 31 from moving upwards relative to the outer central tube 8, thus preventing unsealing.

[0025] Example 6: As attached Figure 1 , 2 As shown in Figure 3, the rubber sleeve 36 assembly includes a flow-carrying ring 38 and, from top to bottom, an upper ring 35, a rubber sleeve 36, and a lower ring 37. The rubber sleeve 36 has an inner mounting groove in its middle section, within which the flow-carrying ring 38 is installed. This design ensures a better seal for the rubber sleeve 36 during use.

[0026] Example 7: As attached Figure 1 , 2 As shown in Figure 3, a construction method using the above-mentioned integrated pipe string for water absorption measurement, sealing, and release includes the following steps: (1) After connecting tubing 1, safety joint 2, packer 3 and cement retainer from top to bottom, the connected tubing string is lowered into the well to above the sealing layer. (2) After the tubing string is lowered to the predetermined position, the tubing string is lifted and then lowered and pressurized so that the slips of the packer 3 are anchored on the casing wall and the rubber sleeve 36 of the packer 3 is longitudinally compressed to seal the annular space of the casing. Drilling fluid is steadily injected into the tubing 1, the formation water absorption is measured, the pump is stopped and the pressure in the tubing 1 is released, the tubing string is lifted, and the rubber sleeve 36 of the packer 3 is retracted and unsealed. The water absorption of different extrusion sections is measured by positive and negative pressure. (3) Adjust the position of the cement retainer and perform positive circulation well washing until the wellhead is clean and free of impurities. Then, put in the pressure-blocking ball and let it fall into the ball seat sliding sleeve 10 to block the central channel. (4) Continue pressurizing. The liquid enters the hydraulic ring groove 39 through the upper liquid passage and pushes the upper piston 22 down. It pushes the lower piston 23 down through the lower liquid passage. Under the action of the upper piston 22 and the lower piston 23, the starting shear pin 17 is cut off, so that the outer cylinder 5 and the abutment sleeve 25 go down and push the setting assembly. After the setting shear pin 20 is cut off, the upper slip 30, the rubber sleeve 36 assembly and the lower slip 33 complete the setting. (5) Continue to pressurize until the shear pin 18 is cut off. The ball seat sliding sleeve 10 slides down to the upper side of the retaining ring 13 fixedly installed on the inner side of the lower end of the cone ball cage 9, so that the central channel is connected to the annulus through the inner liquid passage hole 29 and the outer liquid passage hole 28, the squeezing and blocking channel is opened, and normal squeezing and sealing operation is carried out. (6) Lift the tubing column so that the upper end of the converging claw 15 enters the release ring groove 16 and expands radially outward. The converging sleeve 14 blocks the external liquid passage 28, closes the squeezing channel, and realizes pressurized condensation. (7) Perform reverse circulation well washing to replace the excess cement slurry in the tubing, and perform forward circulation well washing until the wellhead is clean and free of impurities; (8) Continue pressurizing until the shear pin 19 is cut off, then release the tubing string, shut in the well and wait for the concrete to set.

[0027] During operation, the first step is to lower the tubing string: connect the tubing 1, safety joint 2, packer 3, and cement retainer from top to bottom, and then lower the connected tubing string into the well above the extrusion zone. The safety joint 2 is connected to the tubing 1 using a reverse thread, and the packer 3 can be a Y211 model. The second step is to measure water absorption: after the tubing string reaches the predetermined position, lower it again and apply pressure of 80 to 100 kN to anchor the packer 3 slips to the casing wall. The packer 3's rubber sleeve 36 is longitudinally compressed to seal the annular space between the casing and tubing, and drilling fluid is steadily injected into the tubing 1. The formation water absorption is measured. After stopping the pump and releasing the pressure in the tubing 1, the tubing string is raised, and the packer 3's rubber sleeve 36 retracts and releases. Water absorption in different extrusion zones is measured by forward and reverse pressure testing. The third step is extrusion sealing: adjust the position of the cement retainer and perform forward circulation well flushing until the wellhead is clean and free of impurities. After the pressure is released, the pressure-holding ball is inserted and allowed to settle freely for 15 to 20 minutes. When the bottom pressure is high, a small-volume circulation method can be used to send the pressure-holding ball into place. The pressure-holding ball falls into the ball seat sliding sleeve 10 to block the central channel. After the pressure is released, the cement retainer is set. Continue to pressurize, pressurize to 5 MPa and stabilize for 3 to 5 minutes. Increase the pressure by 5 MPa each time and stabilize for 3 to 5 minutes until the shear pin 18 is cut off. The ball seat sliding sleeve 10 slides down, the squeezing channel is opened, and the squeezing operation is carried out. Fourth step, release: lift the tubing string so that the upper end of the convergence claw 15 enters the release ring groove 16 and expands radially outward. The convergence sleeve 14 blocks the external liquid passage hole 28, closes the squeezing channel, and achieves pressurized waiting for solidification. Perform reverse circulation well washing to replace the excess cement slurry in the tubing string. Perform forward circulation well washing until the wellhead is clean and free of impurities. Continue to pressurize until the release shear pin 19 is cut off, achieve release, pull out the tubing string, shut in the well and wait for solidification.

[0028] This embodiment utilizes a double-sealing structure consisting of a packer 3 and a cement retainer. During operation, the packer 3 is lowered through the oil pipe 1 to the middle of the upper extrusion sealing layer 41 and the lower extrusion sealing layer 42. After setting, the water absorption of the upper extrusion sealing layer 41 and the lower extrusion sealing layer can be measured. After the packer 3 is released, the setting position of the cement retainer is adjusted to complete the extrusion sealing of the lower extrusion sealing layer 42 and tool release. The operation is continuous, and water absorption measurement, extrusion sealing, and tool release can be completed in one trip of the tubing, thereby improving the efficiency of the extrusion sealing operation and saving operation time and costs.

[0029] The above technical features constitute the preferred embodiment of the present invention, which has strong adaptability and optimal implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the requirements of different situations.

Claims

1. An integrated tubular column for measuring water absorption, sealing, and releasing water, characterized in that... The system includes, from top to bottom, oil pipes, safety joints, packers, and cement retainers. The cement retainer comprises an upper joint, an outer cylinder, an inner central tube, an outer central tube, a conical ball cage, a ball seat sleeve, a valve body, a shut-off valve sleeve, a setting assembly, and a hydraulic starting assembly. The outer cylinder is fixedly installed on the outer side of the lower end of the upper joint. The inner central tube is fixedly installed on the inner side of the lower end of the upper joint. The conical ball cage is fixedly installed on the lower end of the inner central tube. The ball seat sleeve is fixedly installed on the inner side of the upper part of the conical ball cage via a shut-off shear pin. A retaining ring is fixedly installed on the inner side of the lower end of the conical ball cage. The outer central tube, located on the outer side of the middle of the conical ball cage, is fixedly installed on the outer side of the lower part of the inner central tube via a release shear pin. The setting assembly is located on the outer side of the upper end of the outer central tube, corresponding to the position between the upper joint and the setting assembly. A hydraulic starting component is provided on the outer side of the inner central tube, which can set the setting assembly after downward movement. The upper part of the hydraulic starting component is fixedly installed with the lower part of the outer cylinder by starting shear pins. At least one starting fluid hole is provided on the inner central tube of the hydraulic starting component. A sleeve valve body is fixedly installed on the outer side of the lower end of the outer central tube. Several external fluid passage holes are provided on the outer side of the upper part of the sleeve valve body. Several internal fluid passage holes are provided on the outer side of the lower part of the conical ball cage corresponding to the position of the external fluid passage holes. A converging sleeve is provided in the sleeve valve body below the position of the external fluid passage holes. Several radially inwardly contracting claws are provided on the upper side of the converging sleeve at circumferential intervals. A closing valve sleeve with its upper end located on the outer side of the middle part of the conical ball cage is provided on the outer side of the upper part of the converging claws. A release ring groove that allows the converging claws to expand radially outward is provided on the inner side of the upper part of the closing valve sleeve.

2. The integrated tubular column for measuring water absorption, sealing, and releasing water as described in claim 1, characterized in that... The hydraulic starting assembly includes a cylinder liner, an upper piston, a lower piston, a connecting sleeve, and an abutment sleeve. The inner central tube includes an upper central tube and a lower central tube. The starting fluid port includes an upper fluid passage port and a lower fluid passage port. The cylinder liner with its lower end located below it is fixedly installed on the inner side of the outer cylinder body by a starting shear pin. The lower piston with its lower end located below it is fixedly installed on the inner side of the lower end of the cylinder liner. The abutment sleeve with its lower end abutting against the upper side of the setting assembly is fixedly installed on the outer side of the lower end of the lower piston. A connecting sleeve is provided in the cylinder liner above the lower piston. The upper central tube is fixedly installed on the inner side of the upper end of the connecting sleeve. The lower central tube is fixedly installed on the inner side of the lower end of the connecting sleeve. The upper piston is fixedly installed on the inner side of the upper end of the cylinder liner. A hydraulic ring groove is provided on the inner side of the upper end of the upper piston. An upper fluid passage port with internal and external penetration is provided on the upper central tube corresponding to the position of the hydraulic ring groove. A lower fluid passage port with internal and external penetration is provided on the lower central tube corresponding to the position between the connecting sleeve and the lower piston.

3. The integrated tubular column for measuring water absorption, sealing, and releasing water as described in claim 2, characterized in that... It also includes O-rings, with at least one O-ring spaced vertically between the upper piston and the upper central tube, at least one O-ring spaced vertically between the hydraulic cylinder liner and the outer cylinder corresponding to the upper piston position, at least one O-ring spaced vertically between the connecting sleeve and the hydraulic cylinder liner, at least one O-ring spaced vertically between the lower piston and the lower central tube, at least one O-ring spaced vertically between the lower piston and the hydraulic cylinder liner; at least one O-ring spaced vertically between the lower outer side of the lower central tube and the inner side of the outer central tube, at least one O-ring spaced vertically between the ball seat sliding sleeve and the cone ball cage, at least one O-ring spaced vertically between the upper part of the converging sleeve and the sleeve valve body, at least one O-ring spaced vertically between the lower part of the converging sleeve and the sleeve valve body, and at least one O-ring spaced vertically between the closing valve sleeve and the sleeve valve body.

4. The integrated tubular column for measuring water absorption, sealing, and releasing water as described in claim 1, 2, or 3, characterized in that... The setting assembly includes, from top to bottom, an upper slip, an upper cone, a rubber sleeve assembly, a lower cone, and a lower slip located on the outer side of the upper part of the outer central tube. The lower end of the lower slip sits on the upper side of the sleeve valve body. The upper part of the upper cone is a frustum shape with a smaller upper part and a larger lower part. The inner side of the lower end of the upper slip is provided with a frustum hole that matches the upper part of the upper cone. The upper end of the upper cone is located on the inner side of the lower part of the upper slip. The lower part of the lower cone is a frustum shape with a larger upper part and a smaller lower part. The inner side of the upper end of the upper slip is provided with a frustum hole that matches the upper part of the lower cone. The lower end of the lower cone is located on the inner side of the upper part of the lower slip.

5. The integrated tubular column for measuring water absorption, sealing, and releasing water as described in claim 4, characterized in that... It also includes a setting shear pin and a one-way anti-reverse assembly. The upper and lower cones are fixedly installed together with the outer center tube by the setting shear pin. The one-way anti-reverse assembly includes a locking ring, an outer anti-reverse tooth, and an inner anti-reverse tooth. An anti-reverse ring groove is provided on the inner side of the lower end of the upper cone. A locking ring is fixedly installed in the anti-reverse ring groove. At least one set of inner anti-reverse teeth is continuously provided on the inner side of the locking ring from top to bottom. The inner anti-reverse tooth is a truncated ring with a right-angled triangular cross-section, which is wider at the top and narrower at the bottom. The outer side of the upper part of the outer center tube corresponding to the locking ring position is provided with an outer anti-reverse tooth that matches the inner anti-reverse tooth. The outer anti-reverse tooth is a truncated ring with a right-angled triangular cross-section, which is narrower at the top and wider at the bottom.

6. The integrated tubular column for measuring water absorption, sealing, and releasing water as described in claim 4, characterized in that... The rubber sleeve assembly includes a current-carrying ring and an upper end ring, a rubber sleeve, and a lower end ring arranged sequentially from top to bottom. The rubber sleeve has an installation ring groove on its inner side in the middle, and the current-carrying ring is installed in the installation ring groove.

7. The integrated tubular column for measuring water absorption, sealing, and releasing water as described in claim 5, characterized in that... The rubber sleeve assembly includes a current-carrying ring and an upper end ring, a rubber sleeve, and a lower end ring arranged sequentially from top to bottom. The rubber sleeve has an installation ring groove on its inner side in the middle, and the current-carrying ring is installed in the installation ring groove.

8. A construction method for an integrated tubular column for measuring water absorption, sealing, and releasing water as described in any one of claims 5 to 7, characterized in that... The steps include the following: (1) After connecting the tubing, safety joint, packer and cement retainer from top to bottom, the connected tubing string is lowered into the well to above the sealing layer. (2) After the tubing string is lowered to the predetermined position, the tubing string is lifted and then lowered and pressurized to anchor the packer's slips to the casing wall and longitudinally compress the packer's rubber sleeve to seal the annular space of the casing. Drilling fluid is steadily injected into the tubing, and the formation water absorption is measured. After stopping the pump and releasing the pressure in the tubing, the tubing string is lifted, and the packer's rubber sleeve is retracted and unsealed. The water absorption of different extrusion sections is measured by pressing in both directions. (3) Adjust the position of the cement retainer and perform positive circulation well washing until the wellhead is clean and free of impurities. Then, put in the pressure-blocking ball, which falls into the ball seat sliding sleeve to block the central channel. (4) Continue pressurizing. The liquid enters the hydraulic ring groove through the upper liquid passage and pushes the upper piston down. It pushes the lower piston down through the lower liquid passage. Under the action of the upper and lower pistons, the starting shear pin is cut off, causing the outer cylinder and the abutment sleeve to move down and push the setting assembly. After the setting shear pin is cut off, the upper slip, the rubber sleeve assembly and the lower slip are set. (5) Continue pressurizing until the shear pin is cut off. The ball seat sliding sleeve slides down to the upper side of the retaining ring fixedly installed on the inner side of the lower end of the cone ball cage, so that the central channel is connected to the annulus through the inner liquid passage and the outer liquid passage, and the squeezing and blocking channel is opened to carry out normal squeezing and sealing operations. (6) Lift the tubing string so that the upper end of the converging claw enters the release ring groove and expands radially outward. The converging sleeve blocks the external liquid passage hole and closes the squeezing channel to achieve pressurized condensation. (7) Perform reverse circulation well washing to replace the excess cement slurry in the tubing string, and perform forward circulation well washing until the wellhead is clean and free of impurities. (8) Continue pressurizing until the shear pin breaks, then release the tubing string, shut in the well and wait for the concrete to set.

Images