An integrated intubating packer and method of use

Abstract

The application provides an integrated intubation extrusion packer and a use method, and belongs to the field of oil and gas development, and comprises an intubation assembly and a packer part; wherein the intubation assembly comprises, in sequence, an upper joint, a first central pipe, a second central pipe, a third central pipe and an intubation lower joint, a first setting piston, a second setting piston, a first-stage piston cavity and a second-stage piston cavity; and the packer part comprises an outer central pipe, an outer central pipe lower joint, a setting outer sleeve, a sealing rubber cylinder combination, an upper cone, an upper slip, a lower cone and a lower slip. The application realizes setting, setting and releasing and handover through the pressure action of the double-stage hydraulic setting piston arranged in the intubation assembly, and then realizes cement extrusion setting without moving the pipe column. In the use process, one pipe column realizes the packer into the well, setting, sealing checking and pressure extrusion setting operation, the construction operation is simple, the number of pipe column downhole operation is saved, the construction period is shortened, and the workover efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of oil and gas development, and in particular to an integrated insertion and packer and its method of use. Background Technology

[0002] During the construction of oilfields such as gas storage facilities and gas-driven operations, in order to effectively ensure the sealing of the block, wells that do not meet the requirements for reuse must be plugged and abandoned. During the permanent abandonment of wells, in the process of squeezing out lost circulation sections, perforated sections, and sections with substandard cementing quality, due to the complex conditions of the wellbore, split-type insert packers are often used to plug injection and production wells.

[0003] However, since the packer and casing of a split-type packer are two separate tools, the construction process involves several steps. First, the packer is lowered into the well, then pressure-set and released, followed by retrieving the release string. Next, a test string is lowered, and after successful testing, it is retrieved. Then, the packer string is lowered to connect with the packer, cement is used to seal the target layer, and the packer string is retrieved for subsequent construction. This process is cumbersome, involves numerous trips of string retrieval, has a long construction period, and is costly. Summary of the Invention

[0004] This application provides an integrated cannulation packer and its usage method, which can solve the problems of cumbersome construction procedures, multiple times of raising and lowering the tubing, long construction period and high operating cost in the prior art.

[0005] In a first aspect, this application provides an integrated cannula extrusion packer, comprising:

[0006] The intubation assembly includes an upper connector, a first central tube, a second central tube, a third central tube, and a lower connector connected in series, a first setting piston, a second setting piston, a first-stage piston chamber, and a second-stage piston chamber.

[0007] The packer section includes an outer central tube, an outer central tube lower connector, a setting sleeve, a sealing rubber sleeve assembly, an upper cone, an upper slip, a lower cone, and a lower slip;

[0008] in,

[0009] One end of the first central tube is connected to the oil pipe through the upper connector, and the end of the third central tube away from the second central tube is connected to the outer central tube through the lower connector; the first setting piston is sleeved on the first central tube and the upper connector; the second setting piston is sleeved on the first central tube and the second central tube;

[0010] The setting sleeve is fitted onto the outer center tube near one end of the third center tube; the sealing sleeve assembly is fitted onto the outer center tube, located on the side of the setting sleeve away from the third center tube; the upper cone and the upper slip are fitted onto the outer center tube, located between the setting sleeve and the sealing sleeve assembly; the lower cone and the lower slip are fitted onto the outer center tube, located on the side of the sealing sleeve assembly away from the third center tube.

[0011] Optionally, the second setting piston has uniformly distributed circular through holes at one end near the first central tube.

[0012] Optionally, the outer sealing sleeve is fitted onto the outer central tube near one end of the third central tube, comprising:

[0013] The outer casing of the setter is provided with a threaded hole, and the outer center tube is provided with a setter pin groove that matches the setter pin. The setter pin passes through the threaded hole on the outer casing and is installed in the setter pin groove on the outer center tube, thereby connecting and fixing the outer casing to the outer center tube.

[0014] Optionally, the upper cone and the upper slip are fitted onto the outer central tube, located between the setting outer sleeve and the sealing sleeve assembly; the lower cone and the lower slip are fitted onto the outer central tube, located on the side of the sealing sleeve assembly away from the third central tube, including:

[0015] The seat cover is provided with a seat cover threaded hole, and the upper cone protruding shoulder is provided with a first seat pin groove that matches the first seat pin. The first seat pin passes through the seat cover threaded hole and is installed in the first seat pin groove on the upper cone protruding shoulder to connect and fix the seat cover to the upper cone.

[0016] The lower connector of the outer center tube is provided with a threaded hole, and the protruding shoulder of the lower cone is provided with a second seat pin groove that matches the second seat pin. The second seat pin passes through the threaded hole of the lower connector of the outer center tube and is installed in the second seat pin groove on the protruding shoulder of the lower cone, thereby connecting and fixing the lower connector of the outer center tube to the lower cone.

[0017] Optionally, the end of the upper cone near the sealing rubber cylinder assembly is a slope with an inclined angle; the end of the lower cone near the sealing rubber cylinder assembly is a slope with an inclined angle.

[0018] The upper clamp is fitted onto the upper cone, and the upper clamp is an integral structure with an inclined groove on one side; the lower clamp is fitted onto the lower cone, and the lower clamp is an integral structure with an inclined groove on one side; wherein, the upper clamp and the lower clamp have opposite inclination directions and the same inclination angle.

[0019] Optionally, the end of the third central tube furthest from the second central tube is connected to the outer central tube via the lower insertion connector, including:

[0020] The outer central tube has a threaded hole, and the third central tube has a release pin groove that matches the release pin. The release pin passes through the threaded hole on the outer central tube and is installed in the release pin groove of the third central tube, thereby connecting and fixing the outer central tube and the third central tube.

[0021] Optionally, the inner side of the third central tube is provided with a shoulder, and a baffle is provided on the shoulder. The baffle is connected and fixed to the third central tube by a shear pin.

[0022] The third central tube has a keyway-type side hole at the end away from the second central tube, and the keyway-type side hole is located below the baffle.

[0023] Optionally, the anti-backflow device includes:

[0024] The lower connector of the outer central tube has a keyway-shaped lateral liquid outlet at one end away from the outer central tube. The lateral liquid outlet has an inclined inner shoulder on the side near the outer central tube. The inner shoulder has a steel ball, a spring and a plug on the side away from the outer central tube.

[0025] Secondly, this application provides a method for using an integrated cannula extrusion packer, including:

[0026] Sitting on the seat, sitting on the card, and dropping the hand;

[0027] The baffle located in the third central pipe is knocked down, and the sealing status is determined by observing the change in wellhead casing pressure;

[0028] The sealing fluid is injected through the oil pipe, and the sealing fluid passes through the central pipe, passes through the anti-backflow device, and enters the bottom layer to complete the pressurized sealing.

[0029] The tubing is lifted to remove the integrated insertion cannula packer assembly.

[0030] Optional features include: Sealing, Card-sitting, and Hand-dropping.

[0031] High-pressure liquid enters the first-stage piston chamber and the second-stage piston chamber. The pressure in the first-stage piston chamber and the second-stage piston chamber acts on the first-setting piston and the second-setting piston, pushing the setting outer sleeve, the upper slip, and the upper cone to compress the sealing rubber sleeve assembly, completing the rubber sleeve setting. The setting outer sleeve pushes the upper slip to complete the setting and locking. The release pin is sheared, completing the release.

[0032] This application provides an integrated casing packer and its usage method. The application utilizes a two-stage hydraulic setting piston (first setting piston and second setting piston) within the casing assembly. The setting sleeve pushes the cone and slips downwards, compressing the rubber sleeve and achieving sealing and anchoring of the packer. Continued pressurization causes the casing assembly to disengage from the packer, allowing cement to be squeezed into the target layer without moving the tubing string. The casing string is then removed, and the packer remains permanently in the well. The integrated casing packer and its usage method provided by this application have the following advantages:

[0033] (1) The packer adopts liquid pressure setting, which is safe and reliable for construction. It has high pressure bearing capacity, is not limited by the size of well inclination, and has a wide range of applications.

[0034] (2) During the operation, the packer is inserted into the well, set, stuck, released, verified and squeezed under pressure by only one tubing string. This realizes the functions of the three tubing strings in the existing technology: release tubing string, verification tubing string, and insertion tubing string. The construction operation is simple, saves the number of tubing string operations in the well, shortens the construction cycle, reduces the operation cost and labor intensity, avoids the risk of major repair operations, and improves well repair efficiency.

[0035] (3) By setting up a built-in baffle for inspection, the risk of throwing the ball is avoided, and time and procedures are saved.

[0036] (4) During the process of the packer being run down the well with the tubing string, the setting and locking pins can overcome the inertial force and hydraulic impact generated in the tubing string, avoid premature setting of the packer and failure of the tubing string, and improve the safety and operability of the packer. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the integrated cannula extrusion packer provided in an embodiment of the present invention;

[0039] Figure 2This is a schematic diagram of the cannula assembly structure of the integrated cannula extrusion packer provided in an embodiment of the present invention;

[0040] Figure 3 This is a schematic diagram of the packer section structure of the integrated cannula extrusion packer provided in an embodiment of the present invention;

[0041] Figure 4 This is a flowchart illustrating the usage method of the integrated cannula extrusion packer provided in this embodiment of the invention.

[0042] Explanation of reference numerals in the attached drawings: 101. Cannula assembly; 1. Upper connector; 2. First setting piston; 3. First O-ring; 4. Second O-ring; 5. Second setting piston; 6. First central tube; 7. Connecting connector; 8. Second central tube; 9. Third O-ring; 10. Third central tube; 27. Sixth O-ring; 28. Shear pin; 29. ​​Baffle; 30. Lower connector; 102. Packer 11. Release pin; 12. Set seal outer sleeve; 13. Set seal pin; 14. Fourth O-ring seal; 15. Outer center tube; 16. Set pin; 17. Upper slip; 18. Upper cone; 19. Copper cup; 20. End rubber sleeve; 21. Middle rubber sleeve; 22. Spacer ring; 23. Lower slip; 24. Lower cone; 25. Lower connector; 26. Fifth O-ring seal; 31. Steel ball; 32. Spring; 33. Plug. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] To address the problems of numerous tubing string tripping operations, long construction periods, and high operating costs associated with existing technologies in permanent well abandonment operations, this application proposes a one-piece tubing extrusion packer and its usage method. This method utilizes a two-stage piston fitted onto the outer wall of the central tube of the one-piece tubing extrusion packer to achieve setting, locking, and release. The central tube of the one-piece tubing extrusion packer performs the verification and extrusion processes. The entire construction process eliminates the need to trip the tubing string; the tubing string is only tripped after the well sealing process is completed by the one-piece tubing extrusion packer. The one-piece tubing extrusion packer and its usage method provided in this application achieve the functions of three tubing strings in existing technologies: release string, verification string, and tubing string, reducing the number of tubing string tripping operations, shortening the construction period, and lowering construction costs.

[0045] Based on the above technical concept, this application provides an integrated cannula extrusion packer and its usage method.

[0046] In a first aspect, embodiments of this application provide an integrated cannula extrusion packer, comprising:

[0047] The intubation assembly includes an upper connector, a first central tube, a second central tube, a third central tube, and a lower connector connected in series, a first setting piston, a second setting piston, a first-stage piston chamber, and a second-stage piston chamber.

[0048] The packer section includes an outer central tube, an outer central tube lower connector, a setting sleeve, a sealing rubber sleeve assembly, an upper cone, an upper slip, a lower cone, and a lower slip;

[0049] in,

[0050] One end of the first central tube is connected to the oil pipe through the upper connector, and the end of the third central tube away from the second central tube is connected to the outer central tube through the lower connector; the first setting piston is sleeved on the first central tube and the upper connector; the second setting piston is sleeved on the first central tube and the second central tube;

[0051] The setting sleeve is fitted onto the outer center tube near one end of the third center tube; the sealing sleeve assembly is fitted onto the outer center tube, located on the side of the setting sleeve away from the third center tube; the upper cone and the upper slip are fitted onto the outer center tube, located between the setting sleeve and the sealing sleeve assembly; the lower cone and the lower slip are fitted onto the outer center tube, located on the side of the sealing sleeve assembly away from the third center tube.

[0052] In practice, the upper connector is connected to the first central tube and the second central tube by threads; the upper connector, the first setting piston and the first central tube are sealed by the first and second O-rings; the second setting piston, the first central tube and the second central tube are sealed by O-rings.

[0053] The first setting piston is connected to the first central tube through the first-stage piston chamber, and the second setting piston is connected to the second central tube through the second-stage piston chamber.

[0054] This application employs a two-stage setting piston design. Since the pressure it can withstand depends on the liquid pressure and the piston area, under a constant liquid pressure, the larger the piston area, the greater the pressure it can withstand. The two-stage piston design effectively increases the piston area, thereby increasing the upper limit of pressure resistance under the same liquid pressure. This results in a packer with low setting pressure, strong pressure resistance, and reliable sealing.

[0055] The outer wall of the outer central tube is fitted with a setting sleeve, an upper cone, an upper slip, a copper cup, a sealing rubber sleeve assembly, a copper cup, a lower cone, and a lower slip, extending from the end closest to the third central tube to the end furthest from the third central tube. The sealing rubber sleeve assembly includes an end rubber sleeve, a spacer ring, a middle rubber sleeve, a spacer ring, and an end rubber sleeve.

[0056] The second setting piston has uniformly distributed circular through holes at one end near the first central tube.

[0057] In practice, during the setting process, high-pressure fluid enters the wellbore, causing the pressure inside the wellbore to continuously rise. This creates a pressure difference with the outside of the wellbore, which resists the increase in piston volume during setting, hindering packer setting and subsequent processes. Multiple evenly distributed circular through-holes are designed at the end of the second setting piston near the first central tube as pressure balancing holes. These holes allow communication between the inside and outside of the wellbore, effectively balancing the pressure difference and reducing setting resistance.

[0058] The outer sealing sleeve is fitted onto the outer central tube near one end of the third central tube, including:

[0059] The outer casing of the setter is provided with a threaded hole, and the outer center tube is provided with a setter pin groove that matches the setter pin. The setter pin passes through the threaded hole on the outer casing and is installed in the setter pin groove on the outer center tube, thereby connecting and fixing the outer casing to the outer center tube.

[0060] In practice, the setting sleeve located on the outer wall of the outer central tube is connected and fixed to the outer central tube by a setting pin. High-pressure liquid enters the central tube and reaches the first-stage piston chamber and the second-stage piston chamber. As the pressure inside the tube continues to rise, the pressure acts on the first and second setting pistons, the volume of the setting pistons increases, and the pressure rises to the setting pressure. The setting pin connecting the setting sleeve and the outer central tube is sheared off. Under the pressure of the setting piston, the setting sleeve, the upper cone, and the upper slip simultaneously compress the rubber sleeve assembly, thus achieving rubber sleeve setting.

[0061] The upper cone and the upper slip are fitted onto the outer central tube and located between the setting outer sleeve and the sealing sleeve assembly; the lower cone and the lower slip are fitted onto the outer central tube and located on the side of the sealing sleeve assembly away from the third central tube, including:

[0062] The seat cover is provided with a seat cover threaded hole, and the upper cone protruding shoulder is provided with a first seat pin groove that matches the first seat pin. The first seat pin passes through the seat cover threaded hole and is installed in the first seat pin groove on the upper cone protruding shoulder to connect and fix the seat cover to the upper cone.

[0063] The lower connector of the outer center tube is provided with a threaded hole, and the protruding shoulder of the lower cone is provided with a second seat pin groove that matches the second seat pin. The second seat pin passes through the threaded hole of the lower connector of the outer center tube and is installed in the second seat pin groove on the protruding shoulder of the lower cone, thereby connecting and fixing the lower connector of the outer center tube to the lower cone.

[0064] In practice, the outer sealing sleeve located on the outer wall of the outer central tube is connected and fixed to the upper cone via a first locking pin, and the lower connector of the outer central tube is connected and fixed to the lower cone via a second locking pin. The outer central tube and the lower connector of the outer central tube are sealed by a fifth O-ring. High-pressure liquid enters the central tube and reaches the first-stage piston chamber and the second-stage piston chamber, increasing the pressure inside the tube and completing the setting process. Subsequently, the pressure continues to increase, reaching the locking pressure, and the locking pin is sheared. Under the pressure of the setting piston, the outer sealing sleeve pushes the upper slip downward. During the setting process, the rubber sleeve assembly also pushes the lower slip and the lower cone upward under the pressure of the outer sealing sleeve, the upper slip, and the upper cone, simultaneously achieving setting and locking anchoring.

[0065] During the running-in process of the integrated tubing extrusion packer, since no high-pressure fluid enters the tubing, the setting pins and locking pins used for connection and fixation can overcome the inertial force and hydraulic impact force generated in the tubing string. This can prevent the packer from being prematurely set or the tubing string from failing due to reasons such as collisions during the running-in process, thus improving the safety and operability of the integrated tubing extrusion packer.

[0066] The upper cone has a sloped surface with an inclined angle at the end near the sealing rubber cylinder assembly; the lower cone has a sloped surface with an inclined angle at the end near the sealing rubber cylinder assembly.

[0067] The upper clamp is fitted onto the upper cone, and the upper clamp is an integral structure with an inclined groove on one side; the lower clamp is fitted onto the lower cone, and the lower clamp is an integral structure with an inclined groove on one side; wherein, the upper clamp and the lower clamp have opposite inclination directions and the same inclination angle.

[0068] In practice, the upper cone, upper slip, lower cone, and lower slip are all slopes with a certain degree of inclination. When pressure is applied to the upper cone, upper slip, lower cone, and lower slip, the slopes with a certain degree of inclination can more easily contact the well wall for locking, reducing the difficulty of locking and improving the stability of the locking and anchoring.

[0069] Because the upper slip is subjected to pressure from the setting sleeve near the third central tube, and the lower slip is subjected to the reaction force from the rubber sleeve assembly, the pressure on the upper and lower slips is in opposite directions. Therefore, the upper and lower slips are set with opposite tilt directions and the same tilt angle, which makes it easier to set the slips, reduces the difficulty of setting the slips, and makes the setting and anchoring more stable.

[0070] The end of the third central tube furthest from the second central tube is connected to the outer central tube via the lower connector of the insertion tube, including:

[0071] The outer central tube has a threaded hole, and the third central tube has a release pin groove that matches the release pin. The release pin passes through the threaded hole on the outer central tube and is installed in the release pin groove of the third central tube, thereby connecting and fixing the outer central tube and the third central tube.

[0072] In practice, the lower connector of the third central tube of the cannula assembly is connected and fixed to the outer central tube of the packer section via a release pin. A fourth O-ring seal is used to seal the third central tube and the outer central tube. High-pressure liquid enters the central tube and reaches the first-stage piston chamber and the second-stage piston chamber. As the pressure inside the tube continuously increases, after the packer's setting and locking processes are completed in sequence, the pressure continues to rise to a certain value, reaching the release pressure. The pressure inside the tube causes the release pin to be sheared, the cannula assembly to disconnect from the packer section, and the packer is released.

[0073] The third central tube has a shoulder on its inner side, and a baffle is provided on the shoulder. The baffle is connected and fixed to the third central tube by a shear pin.

[0074] The third central tube has a keyway-type side hole at the end away from the second central tube, and the keyway-type side hole is located below the baffle.

[0075] In practice, the baffle and the third central tube are sealed by a sixth O-ring. The end of the third central tube furthest from the second central tube is connected to a lower connector, which has several evenly distributed circular through holes and an arc-shaped bottom. High-pressure liquid enters the tube and, as the pressure increases, the liquid advances until it reaches the third central tube, sequentially completing the packer's setting, locking, and release processes. To prevent the liquid from affecting subsequent extrusion sealing processes, a baffle is provided at the end of the third central tube furthest from the second central tube. This baffle can withstand higher pressure and prevents high-pressure liquid from prematurely entering the outer central tube. When the pressure continues to rise to a certain value, reaching the sealing pressure, it indicates that the packer's setting, locking, and release processes are complete. The pressure inside the tube causes the shear pin to be sheared, and the baffle to be knocked down, indicating successful sealing. The liquid channel is then opened, and subsequent extrusion sealing processes can proceed.

[0076] In existing technologies, sealing is achieved through a ball-dropping process. The sealing ball is dropped into the wellbore and lands on the packer's ball seat, indicating successful sealing. However, obstacles in the wellbore can increase the time it takes for the sealing ball to land on the ball seat, or even prevent it from landing correctly, thus affecting the sealing result. In this application, the baffle uses a built-in component, avoiding the risks associated with ball-dropping and saving time and steps.

[0077] The integrated cannula extrusion packer is equipped with an anti-backflow device, including:

[0078] The lower connector of the outer central tube has a keyway-shaped lateral liquid outlet at one end away from the outer central tube. The lateral liquid outlet has an inclined inner shoulder on the side near the outer central tube. The inner shoulder has a steel ball, a spring and a plug on the side away from the outer central tube.

[0079] In specific implementation, a lower connector is placed at the end of the outer central tube furthest from the third central tube. The upper end of the lower connector is designed with an inwardly protruding shoulder with internal threads. The outer central tube and the lower connector are connected through the threads on the inwardly protruding shoulder, and a fifth O-ring seal is used to seal between the outer central tube and the lower connector. Several keyway-shaped lateral liquid outlet holes are provided at the end of the lower connector of the outer central tube furthest from the outer central tube. An inclined inner shoulder is provided on the side of the lateral liquid outlet holes near the outer central tube. A steel ball is placed at the lower part of the inner shoulder, a spring is placed at the lower part of the steel ball, and a plug is placed at the lower part of the spring. The steel ball contacts the inner shoulder under the action of the spring force to achieve a steel-to-steel line seal. The plug is located at the bottom of the lower connector of the outer central tube and has several evenly distributed circular through holes.

[0080] After completing the setting and release procedures, the pressure is so high that the baffle is knocked down, indicating that the sealing is successful. Cement is then pumped in for extrusion sealing. As the baffle between the third central pipe and the outer central pipe is knocked down, the passage between the third central pipe and the outer central pipe is opened. The cement passes through the central pipe to the lower joint of the outer central pipe. As the pressure continues to rise, it reaches the extrusion sealing pressure. The cement is pushed out from the side hole of the lower joint and the plug hole, reaching the wellbore and the formation, thus completing the extrusion sealing operation.

[0081] In traditional extrusion sealing processes, after cement is extruded to the target formation, the pressure drops instantaneously when the tubing is pulled out, causing a large amount of cement to flow back into the wellbore, creating a cement backflow "flagpole" effect. This results in cement filling the wellbore and the tubing being fixed in place, adversely affecting on-site construction. In the embodiment of this application, after the cement is extruded into the formation, the steel ball, under the action of spring force, re-contacts the inner shoulder to achieve a steel-to-steel line seal, blocking the cement backflow entrance, thus preventing cement backflow and ensuring construction safety.

[0082] Secondly, embodiments of this application provide a method for using an integrated cannula extrusion packer, including:

[0083] Sitting on the seat, sitting on the card, and dropping the hand;

[0084] The baffle located in the third central pipe is knocked down, and the sealing status is determined by observing the change in wellhead casing pressure;

[0085] The sealing fluid is injected through the oil pipe, and the sealing fluid passes through the central pipe, passes through the anti-backflow device, and enters the bottom layer to complete the pressurized sealing.

[0086] The tubing is lifted to remove the integrated insertion cannula packer assembly.

[0087] In practice, the usage method is as follows:

[0088] Setting, locking, and release: After the integrated tubing packer is lowered to the designed well depth, positive pressure is applied inside the tubing. High-pressure fluid reaches the first and second stage piston chambers, acting on the first and second setting pistons. As the fluid pressure increases, the setting pin is sheared off. The first and second setting pistons together push the setting outer sleeve, upper slips, and upper cone downwards to compress the packer. When the pressure reaches a certain value, the packer is set. If the pressure continues to increase, the locking pin is sheared off, and the setting outer sleeve pushes the upper slips downwards. During the setting process, the packer assembly, under the pressure of the setting outer sleeve, upper slips, and upper cone, also pushes the lower slips and lower cone upwards, simultaneously achieving setting and locking. If the pressure continues to increase, the release pin is sheared off, the tubing assembly disconnects from the packer, and the packer is released.

[0089] Verification of sealing: After setting, locking, and releasing the packer, the pressure continues to rise, the shear pin of the fixed baffle is sheared off, the baffle is knocked off, and the passage between the third center pipe and the outer center pipe is opened. By observing the change in the wellhead casing pressure, the packer can be verified to seal.

[0090] Squeezing and sealing: After the packer passes the sealing test, cement is pumped into the tubing by a pump truck. As the baffle between the third central tube and the outer central tube is knocked down, the passage between the third central tube and the outer central tube is opened. The cement reaches the lower joint of the outer central tube through the central pipe. As the pressure continues to rise, the cement passes through the side hole and the central hole, pushes the steel ball, and the fluid passes through the side hole and plug hole of the lower joint, reaching the wellbore and the formation. The pressure continues to increase, and the fluid is pushed into the formation. At the same time, the steel ball re-contacts the inner shoulder under the action of the spring force to achieve a steel-to-steel line seal, blocking the cement backflow inlet and realizing the pressurized squeezing and sealing operation and backflow prevention of the perforated section.

[0091] Retrieving the Inserted Tubing String: After the extrusion sealing is completed, the tubing is pulled up to retrieve the inserted tubing string of the integrated inserted tubing extrusion packer. The released packer permanently seals the wellbore, eliminating the need for retrieval and achieving the sealing effect. The well sealing operation in this application only involves retrieving the inserted tubing string at the very end, reducing the number of times the tubing string needs to be retrieved, shortening the construction period, and lowering construction costs.

[0092] In the embodiments of this application, the setting pressure, clamping pressure, release pressure, sealing pressure and squeezing pressure increase in sequence. The specific values ​​are based on the construction environment in different operation processes, and this application does not limit them here.

[0093] To enable those skilled in the art to better understand this application, the integrated cannula extrusion packer and its usage method described in this application are now explained in detail through the following embodiments.

[0094] Example 1

[0095] This application provides an integrated cannula extrusion packer, the structural schematic of which is shown in the figure below. Figure 1 As shown in the diagram. This integrated cannula extrusion packer comprises two parts: a cannula assembly 101 and a packer section 102. A schematic diagram of the cannula assembly is shown below. Figure 2 As shown in the diagram, the packer section has the following structural schematic. Figure 3 As shown.

[0096] The cannula assembly 101 includes: an upper connector 1, a first setting piston 2, a first O-ring 3, a second O-ring 4, a second setting piston 5, a first central tube 6, a connecting connector 7, a second central tube 8, a third O-ring 9, a third central tube 10, a sixth O-ring 27, a shear pin 28, a baffle 29, and a lower cannula connector 30.

[0097] The packer section 102 mainly includes: a release pin 11, a setting sleeve 12, a setting pin 13, a fourth O-ring seal 14, an outer center tube 15, a setting pin 16, an upper slip 17, an upper cone 18, a copper cup 19, an end rubber sleeve 20, a middle rubber sleeve 21, a spacer ring 22, a lower slip 23, a lower cone 24, a lower connector 25, a fifth O-ring seal 26, a steel ball 31, a spring 32, and a plug 33.

[0098] In the insertion assembly 101, the upper connector 1 is connected to the tubing at the top and to the first central tube 6 at the bottom via threads. The lower part of the first central tube 6 is connected to the second central tube 8 via threads, and the lower part of the second central tube 8 is connected to the third central tube 10 via threads. A first setting piston 2 is fitted around the upper connector 1 and the first central tube 6. The first setting piston 2, the upper connector 1, and the first central tube 6 are sealed by a first O-ring 3 and a second O-ring 4. A second setting piston 5 is fitted onto the first central tube 6 and the second central tube 8. The second setting piston 5, the first central tube 6, and the second central tube 8 are sealed by O-rings. The upper end of the second setting piston 5 is designed with at least one pressure balancing hole to balance the wellbore pressure differential and reduce setting resistance. The design of the two-stage setting piston enables the packer to have low setting pressure, strong pressure resistance, and reliable sealing. The connecting connector 7 is located below the second setting piston 5 and is fitted onto the second central tube 8. The lower end of the third central tube 10 has several keyway-type side holes, and a baffle 29 is placed on the upper part of the side holes. The baffle 29 is located at the protruding shoulder inside the third central tube 10. The baffle 29 and the third central tube 10 are connected and fixed by several evenly arranged shear pins 28, and sealed by a sixth O-ring seal 27. The baffle 29 is an internal component, which avoids the risk of throwing the ball and saves time and processes. The lower part of the third central tube 10 is connected to the lower connector 30 of the insertion tube by threads. The lower connector 30 of the insertion tube has several evenly distributed circular through holes, and the bottom end is arc-shaped.

[0099] In the packer section 102, an outer center tube 15 is fitted around the outside of the third center tube 10. The outer center tube 15 has several evenly distributed threaded holes. Multiple release pins 11 pass through these threaded holes and are fitted into the pin slots of the third center tube 10, connecting and fixing the outer center tube 15 to the third center tube 10. The two are sealed by an array of fourth O-rings 14. A lower connector 25 is located at the lower part of the outer center tube 15. The upper end of the lower connector 25 has an inwardly protruding shoulder with internal threads. The outer center tube 15 and the lower connector 25 are connected by the threads on the inwardly protruding shoulder, and a fifth O-ring 26 seals between them.

[0100] The outer side of the outer center tube 15 is fitted with, from top to bottom, a setting sleeve 12, an upper cone 18, an upper slip 17, a sealing rubber sleeve assembly (copper cup 19, end rubber sleeve 20, spacer ring 22, middle rubber sleeve 21, spacer ring 22, end rubber sleeve 20, copper cup 19), a lower cone 24, and a lower slip 23. The setting sleeve 12 is located at the lower part of the connecting joint 7. The upper end of the setting sleeve 12 is designed with multiple evenly distributed threaded holes. Multiple setting pins 13 pass through the threaded holes on the setting sleeve 12 and are installed in the pin grooves of the outer center tube 15 to achieve connection and fixation. During the process of the packer being run downhole with the tubing string, the setting and setting pins can overcome the inertial force and hydraulic impact force generated in the tubing string, avoiding premature setting of the packer and tubing string failure, thus improving the safety and operability of the packer. The lower end of the sealing sleeve 12 has several threaded holes. Sealing pins 16 pass through these threaded holes and are fixed in the pin grooves of the protruding shoulder of the upper cone 18. The lower end of the upper cone 18 is designed as a slope with a certain angle. An integral upper slip 17 is fitted onto the outside of the upper cone 18. The upper slip 17 is an integral structure with an angled groove on one side, making the anchoring more reliable. A lower slip 23 is fitted onto the outside of the lower cone 24. The angle of inclination of the lower slip 23 is opposite to that of the upper slip 17 but the same. A sealing sleeve assembly connects the upper cone 18 and the lower cone 23. The upper end of the lower connector 25 has multiple threaded holes. Multiple seat pins 16 pass through these threaded holes and are fitted into the pin grooves of the protruding shoulder of the lower cone 24, achieving connection and fixation.

[0101] The lower connector 25 has several keyway-shaped side outlet holes at its lower end. Above the side outlet holes is an inner shoulder, under which a steel ball 31 is placed. Below the steel ball 31 is a spring 32, and below the spring 32 is a plug 33. Under the force of the spring, the steel ball 31 contacts the inner shoulder to achieve a steel-to-steel line seal. The plug 33 is located at the bottom of the lower connector and has several evenly distributed circular through holes. The combination of the steel ball, spring, and plug enables pressurized sealing and prevents cement backflow, ensuring construction safety.

[0102] Example 2

[0103] This application provides a method for using an integrated cannula extrusion packer, such as... Figure 4 The diagram shown is a flowchart illustrating the usage of an integrated cannula extrusion packer. Figure 1 The specific steps are as follows:

[0104] S11. As the pressure increases, the packer is set, locked, and released.

[0105] After the integrated tubing packer is lowered to the designed well depth, positive pressure buildup occurs inside the tubing. High-pressure fluid reaches the first-stage piston chamber 201 and the second-stage piston chamber 202, acting on the first setting piston 2 and the second setting piston 5. As the hydraulic pressure increases, the setting pin 13 is sheared off. The first setting piston 2 and the second setting piston 5 together push the setting outer sleeve 12, the upper slip 17, and the upper cone 18 downwards to compress the packer. When the pressure reaches a certain value, the packer is set. If the pressure continues to rise, the setting pin is sheared off, and the setting outer sleeve 12 pushes the upper slip 17 downwards, achieving packer setting and anchoring. If the pressure continues to rise to a certain value, the release pin 11 is sheared off, and the packer is released.

[0106] S12. The pressure continues to rise, the baffle is knocked off, and the packer is successfully sealed.

[0107] As the pressure inside the tubing continued to rise, the baffle 29 inside the insertion tube was knocked off. By observing the changes in the wellhead casing pressure, the packer's seal was verified.

[0108] S13. As the pressure continues to rise, the pumped cement enters the formation through the central pipeline and the side hole of the lower joint of the outer central pipe, achieving pressurized extrusion sealing.

[0109] After the packer passes the sealing test, cement is pumped into the tubing via a pump truck. The cement passes through the central channel, side hole 301 and central hole 302, and pushes open the steel ball 31. The fluid passes through the lower connector side hole 303 and plug hole 304, and reaches the wellbore and 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 perforated section.

[0110] S14. After the packer is squeezed out, the tubing is pulled up to retrieve the insertion string, and the packer is left in the well.

[0111] After the packer is squeezed and sealed, the tubing is pulled up to retrieve the insertion string of the integrated insertion packer. The left-in packer permanently seals the wellbore after being released, without needing to be retrieved, thus achieving the function of sealing the formation.

[0112] The integrated cannula extrusion packer and its usage method provided in this application have the following advantages:

[0113] (1) The packer adopts liquid pressure setting, which is safe and reliable for construction. It has high pressure bearing capacity, is not limited by the size of well inclination, and has a wide range of applications.

[0114] (2) During the operation, the next tubing string is used to realize the packer insertion, setting, locking, release, verification and sealing under pressure. It realizes the functions of the three tubing strings in the existing technology: release tubing string, verification tubing string, and insertion tubing string. The construction operation is simple, saves the number of tubing string operations in the well, shortens the construction cycle, reduces the operation cost and labor intensity, avoids the risk of major repair operations, and improves well repair efficiency.

[0115] (3) By setting up a built-in baffle for inspection, the risk of throwing the ball is avoided, and time and procedures are saved.

[0116] (4) During the process of the packer being run down the well with the tubing string, the setting and locking pins can overcome the inertial force and hydraulic impact generated in the tubing string, avoid premature setting of the packer and failure of the tubing string, and improve the safety and operability of the packer.

[0117] (5) An anti-backflow device was installed, which enabled pressurized sealing operation and cement anti-backflow function, avoiding cement backflow "flagpole" and achieving construction safety.

[0118] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0119] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0120] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An integrated cannula extrusion packer, characterized in that, include: The intubation assembly includes an upper connector, a first central tube, a second central tube, a third central tube, and a lower connector connected in series, a first setting piston, a second setting piston, a first-stage piston chamber, and a second-stage piston chamber. The packer section includes an outer central tube, an outer central tube lower connector, a setting sleeve, a sealing rubber sleeve assembly, an upper cone, an upper slip, a lower cone, and a lower slip; in, One end of the first central tube is connected to the oil pipe through the upper connector, and the end of the third central tube away from the second central tube is connected to the outer central tube through the lower connector; the first setting piston is sleeved on the first central tube and the upper connector; the second setting piston is sleeved on the first central tube and the second central tube; The setting sleeve is fitted onto the outer center tube near one end of the third center tube; the sealing sleeve assembly is fitted onto the outer center tube, located on the side of the setting sleeve away from the third center tube; the upper cone and the upper slip are fitted onto the outer center tube, located between the setting sleeve and the sealing sleeve assembly; the lower cone and the lower slip are fitted onto the outer center tube, located on the side of the sealing sleeve assembly away from the third center tube. The outer sealing sleeve, fitted onto the outer central tube near one end of the third central tube, includes: The outer casing of the setting seal is provided with a threaded hole, and the outer central tube is provided with a setting pin groove that matches the setting pin. The setting pin passes through the threaded hole on the outer casing and is installed in the setting pin groove on the outer central tube, thereby connecting and fixing the outer casing of the setting seal to the outer central tube. Wherein, the end of the third central tube furthest from the second central tube is connected to the outer central tube via the lower connector of the insertion tube, including: The outer central tube is provided with a threaded hole, and the third central tube is provided with a release pin groove that matches the release pin. The release pin passes through the threaded hole on the outer central tube and is installed in the release pin groove of the third central tube, thereby connecting and fixing the outer central tube and the third central tube. The integrated cannula extrusion packer is equipped with an anti-backflow device, including: The lower connector of the outer central tube has a keyway-shaped lateral liquid outlet at one end away from the outer central tube. The lateral liquid outlet has an inclined inner shoulder on the side near the outer central tube. The inner shoulder has a steel ball, a spring and a plug on the side away from the outer central tube.

2. The integrated cannula extrusion packer according to claim 1, characterized in that, The second setting piston has uniformly distributed circular through holes at one end near the first central tube.

3. The integrated cannula extrusion packer according to claim 1, characterized in that, The upper cone and the upper slip are fitted onto the outer central tube and located between the setting outer sleeve and the sealing sleeve assembly; the lower cone and the lower slip are fitted onto the outer central tube and located on the side of the sealing sleeve assembly away from the third central tube, including: The seat cover is provided with a seat cover threaded hole, and the upper cone protruding shoulder is provided with a first seat pin groove that matches the first seat pin. The first seat pin passes through the seat cover threaded hole and is installed in the first seat pin groove on the upper cone protruding shoulder to connect and fix the seat cover to the upper cone. The lower connector of the outer center tube is provided with a threaded hole, and the protruding shoulder of the lower cone is provided with a second seat pin groove that matches the second seat pin. The second seat pin passes through the threaded hole of the lower connector of the outer center tube and is installed in the second seat pin groove on the protruding shoulder of the lower cone, thereby connecting and fixing the lower connector of the outer center tube to the lower cone.

4. The integrated cannula extrusion packer according to claim 3, characterized in that, Also includes: The upper cone has a sloped surface with an inclined angle at the end near the sealing rubber cylinder assembly; the lower cone has a sloped surface with an inclined angle at the end near the sealing rubber cylinder assembly. The upper clamp is fitted onto the upper cone, and the upper clamp is an integral structure with an inclined groove on one side; the lower clamp is fitted onto the lower cone, and the lower clamp is an integral structure with an inclined groove on one side; wherein, the upper clamp and the lower clamp have opposite inclination directions and the same inclination angle.

5. The integrated cannula extrusion packer according to claim 1, characterized in that, include: The third central tube has a shoulder on its inner side, and a baffle is provided on the shoulder. The baffle is connected and fixed to the third central tube by a shear pin. The third central tube has a keyway-type side hole at the end away from the second central tube, and the keyway-type side hole is located below the baffle.

6. A method of using the integrated cannula extrusion packer according to any one of claims 1-5, characterized in that, include: Sitting on the seat, sitting on the card, and dropping the hand; The baffle located in the third central pipe is knocked down, and the sealing status is determined by observing the change in wellhead casing pressure; The sealing fluid is injected through the oil pipe, and the sealing fluid passes through the central pipe, passes through the anti-backflow device, and enters the bottom layer to complete the pressurized sealing. The tubing is lifted to remove the integrated insertion cannula packer assembly.

7. The method of using the integrated cannula extrusion packer according to claim 6, characterized in that, Seating, card-sealing, and hand-dropping include: High-pressure liquid enters the first-stage piston chamber and the second-stage piston chamber. The pressure in the first-stage piston chamber and the second-stage piston chamber acts on the first-setting piston and the second-setting piston, pushing the setting outer sleeve, the upper slip, and the upper cone to compress the sealing rubber sleeve assembly, completing the rubber sleeve setting. The setting outer sleeve pushes the upper slip to complete the setting and locking. The release pin is sheared, completing the release.

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