One-trip hydraulic setting cement retainer and one-trip hydraulic setting method

Abstract

The present invention relates to the technical field of oil well drilling and production, and specifically discloses a one-trip hydraulic setting cement retainer and a one-trip hydraulic setting method. The retainer includes a construction module and a retainer module; the construction module includes a shear pawl and a construction main body with a hydraulic channel passing through it. A plugging component is installed in the hydraulic channel. The plugging component can seal the hydraulic channel and is connected to the inner wall of the hydraulic channel through a ball seat pin. After the ball seat pin is sheared off, the plugging component disengages from the hydraulic channel. The shear pawl is sleeved on the construction main body and is connected to the construction main body through a shear pin, and can move after the shear pin is sheared off; the retainer module includes a switch valve body, a retainer main body detachably connected to the shear pawl, and a setting component for setting. The construction main body can drive the switch valve body to conduct or block the casing. This retainer can complete the procedures of running in, setting, seal testing, squeezing, and releasing in one trip, thereby realizing seal testing, trial squeezing, and repeated plugging and unplugging operations, with high construction efficiency and low operating costs.

Description

Technical Field

[0001] The present invention relates to the technical field of oil well drilling and production, and particularly to a one-trip hydraulic setting cement retainer and a one-trip hydraulic setting method. Background Art

[0002] Cement retainers are commonly used in secondary cementing of casing, temporary or permanent plugging of oil and gas wells, etc. As a large number of oil and gas fields enter the later stage of exploitation, these operations are becoming more and more frequent. In some oil fields, the number of wells that need to be operated each year even reaches thousands.

[0003] Conventional cement retainers are divided into two types, namely mechanical and hydraulic. The mechanical setting is achieved by rotating and lifting to set the bottom cement retainer. In practical applications, this places higher requirements on the assembly proficiency and on-site experience of operators. Moreover, in wells with a large inclination, due to the ineffective transmission of torque, mechanical cement retainers are usually not recommended. The hydraulic type can overcome these drawbacks. The hydraulic retainer is simple to use and can be used in deviated wells.

[0004] In the prior art, a conventional mechanical cement retainer can complete the processes of running in, setting, seal testing, squeezing, and releasing in one trip; while the existing hydraulic cement retainer requires two trips to complete a complete construction, which makes the working process of the cement retainer extremely cumbersome and complex, and the construction cost is relatively high, seriously affecting the work efficiency. Summary of the Invention

[0005] The purpose of the present invention is to provide a one-trip hydraulic setting cement retainer and a one-trip hydraulic setting method to improve the construction efficiency of the hydraulic cement retainer and reduce the construction cost.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] One - trip hydraulic setting cement retainer, used for plugging the casing, includes a construction module and a retainer module; the construction module includes a construction body and a shear pawl. The construction body is penetrated with a hydraulic channel, and a plugging component is installed in the hydraulic channel. The plugging component can seal the hydraulic channel. The plugging component is connected to the inner wall of the hydraulic channel through a ball seat pin. When the ball seat pin is cut off, the plugging component disengages from the hydraulic channel. The shear pawl is sleeved on the construction body and is connected to the construction body through a shear pin. When the shear pin is cut off, the shear pawl can move along the length direction of the construction body; the retainer module includes a retainer body, a setting component, and a switch valve body. The setting component is sleeved on the retainer body. The retainer body can be set with the casing through the setting component. The retainer body is detachably connected to the shear pawl. The switch valve body can reciprocate between an injection position and a closed position along the length direction of the construction body. The construction body selectively connects the switch valve body and can drive the switch valve body. The switch valve body at the injection position can conduct the casing, and the switch valve body at the closed position can block the casing.

[0008] As a preferred technical solution of the one - trip hydraulic setting cement retainer, the setting component includes a piston sleeve. The piston sleeve is sleeved on the construction body and is connected to the outer side wall of the construction body through a piston pin. The piston sleeve and the construction body enclose a pressure - containing cavity. The hydraulic channel communicates with the pressure - containing cavity. The shear force received by the piston pin can increase with the increase of the pressure - containing cavity. When the piston pin is cut off, the piston sleeve can move towards the bottom end of the construction body; an elastic sleeve is sleeved on the retainer body, and an upper slip is clamped between the elastic sleeve and the piston sleeve, and a lower slip is clamped between the elastic sleeve and the retainer body. The broken upper slip and the broken lower slip can be inserted into the side wall of the casing.

[0009] As a preferred technical solution of the one - trip hydraulic setting cement retainer, the top end of the elastic sleeve is provided with an upper cone in contact with the upper slip, and the bottom end of the elastic sleeve is provided with a lower cone in contact with the lower slip. Both the upper cone and the lower cone gradually narrow towards the retainer body along the direction away from the elastic sleeve.

[0010] As a preferred technical solution of the one - trip hydraulic setting cement retainer, the retainer body includes a central tube and a guide shoe fixedly connected to the bottom end of the central tube. The elastic sleeve is sleeved on the central tube, and the lower slip is clamped between the bottom end of the elastic sleeve and the top end of the guide shoe.

[0011] As a preferred technical solution of the one-trip hydraulic setting cement retainer, the outer side wall of the shear pawl is screwed to the inner side wall of the central tube, and a pawl pin is inserted through both the shear pawl and the central tube. After the pawl pin is cut off, the central tube can be separated from the shear pawl.

[0012] As a preferred technical solution of the one-trip hydraulic setting cement retainer, a ring-shaped V-groove is provided in the middle of the inner wall of the elastic sleeve. A retaining ring is arranged in the V-groove. The retaining ring is in sealing cooperation with the elastic sleeve through a socket ring, and the socket ring is sleeved on the outer wall of the central tube.

[0013] As a preferred technical solution of the one-trip hydraulic setting cement retainer, a plurality of screw slide rails are evenly distributed at intervals on the outer side wall of the construction main body. The length direction of the screw slide rails is parallel to the length direction of the construction main body. A limit screw is installed on the piston sleeve. The number of the limit screws is the same as that of the screw slide rails and they correspond one by one. The screw rod of the limit screw is placed in the screw slide rail.

[0014] As a preferred technical solution of the one-trip hydraulic setting cement retainer, the retainer main body is penetrated with an injection hole. The retainer main body is provided with a retaining seat groove. A pawl positioning groove is provided on the groove wall of the retaining seat groove. The switch valve body is provided with a valve body pawl. The switch valve body in the closed position closes the injection hole, and the valve body pawl is in close fit with the pawl positioning groove.

[0015] As a preferred technical solution of the one-trip hydraulic setting cement retainer, the plugging assembly includes a ball seat ring and a setting ball. The ball seat ring is penetrated with a ventilation hole. The side wall of the ball seat ring is connected to the inner side wall of the hydraulic channel through the ball seat pin. The setting ball placed in the hydraulic channel can press against the ball seat ring to close the ventilation hole.

[0016] A one-trip hydraulic setting method, which is applied to the one-trip hydraulic setting cement retainer described above, includes the following steps:

[0017] S1: Place the one-trip hydraulic setting cement retainer into the casing from top to bottom;

[0018] S2: Make the plugging assembly close the hydraulic channel;

[0019] S3: Increase the hydraulic pressure in the hydraulic channel to make the retainer main body set with the casing;

[0020] S4: Continue to increase the hydraulic pressure in the hydraulic channel until the shear pin is cut off, so that the construction main body can drive the switch valve body to move;

[0021] S5: Continuously increase the hydraulic pressure in the hydraulic channel until the ball seat pin is sheared off, causing the plugging assembly to drop to the bottom of the hydraulic channel, and the hydraulic channel is depressurized;

[0022] S6: Apply gravity to the single-trip hydraulic setting cement retainer to determine the anchoring condition of the retainer body;

[0023] S7: Pull the construction body to move the switch valve body to the closed position;

[0024] S8: Conduct an annulus pressure test and a central pipe pressure test on the retainer module, and debug and determine the sealing performance of the retainer module;

[0025] S9: Pull the construction body to move the switch valve body to the injection position;

[0026] S10: Inject cement into the retainer module until the cement fills the lower part of the retainer module, and then pull the construction body to move the switch valve body to the closed position;

[0027] S11: After the cement solidifies, disassemble the shear pawl from the retainer body, detach the construction module from the retainer module, and move the construction module out of the casing.

[0028] Advantages of the present invention:

[0029] The one-trip hydraulic setting cement retainer is designed such that the shear pawl is sleeved on the construction main body and the retainer main body is detachably connected to the shear pawl. In combination with the arrangement of the shear pin, the construction main body and the retainer main body are fixedly connected before the shear pin is cut, and after the shear pin is cut, the construction main body guides the retainer main body. The above improvements ensure the relative positions of the construction main body and the retainer main body at corresponding stages are determined. The design of the detachable connection of the retainer main body to the shear pawl realizes the selective connection of the construction module and the retainer module, enabling the construction module to be recycled after construction, significantly reducing the construction cost. Similarly, the arrangement of the plugging assembly and the ball seat pin on the plugging assembly allows the hydraulic pressure in the hydraulic channel to be relieved only after reaching a predetermined pressure, enabling the setting operation of the setting assembly to be successfully completed in an environment that meets the pressure requirements, ensuring the setting reliability of the retainer module. The design that the construction main body is selectively connected to the switch valve body and can drive the switch valve body to move enables the operator to smoothly complete the operation of conducting or blocking the casing through the construction main body, and at the same time, the construction main body can smoothly disengage from the switch valve body, ensuring the successful separation of the construction module and the retainer module. The above structural improvements can complete the operations of running in, setting, checking sealing, squeezing, and releasing in one trip, and can also perform the operations of checking sealing and trial squeezing. The split design of the construction module and the retainer module enables the repeated plugging and unplugging actions to be successfully completed. The one-trip hydraulic setting cement retainer is simple to operate, has a wide application range, high construction efficiency, and low operating cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a sectional view of the one-trip hydraulic setting cement retainer in the downhole state provided by an embodiment of the present invention;

[0031] Figure 2 is Figure 1 a cross-sectional view of plane A-A in

[0032] Figure 3 is a schematic structural view of the one-trip hydraulic setting cement retainer in the set state and the squeeze state provided by an embodiment of the present invention;

[0033] Figure 4 is a schematic structural view of the one-trip hydraulic setting cement retainer in the pressure test state provided by an embodiment of the present invention;

[0034] Figure 5 is a sectional view of the retainer module in the released state provided by an embodiment of the present invention;

[0035] Figure 6 is a sectional view of the construction module in the released state provided by an embodiment of the present invention.

[0036] In the figure:

[0037] 100, Construction main body; 110, Upper joint; 111, Joint through-hole; 112, Screw slide rail; 113, Pin positioning hole; 120, Mandrel; 121, Mandrel through-hole; 122, Pressure transmission hole; 127, Mandrel slide rail; 128, Key block; 129, Shearing pin; 130, Sealing plug; 131, Plug through-hole; 140, Ball seat ring; 150, Ball seat pin; 160, Setting ball; 200, Piston sleeve; 210, Limit screw; 220, Piston pin; 300, Shearing ratchet; 310, Ratchet pin; 410, Upper slip; 411, First slip tooth; 420, Lower slip; 421, Second slip tooth; 510, Upper cone; 511, Upper coiled leather pin; 520, Lower cone; 521, Lower coiled leather pin; 530, Elastic sleeve; 531, Socket ring; 532, Retaining ring; 540, Outer back ring; 550, Inner back ring; 560, Central tube; 561, Ratchet positioning groove; 562, Outer ring slide rail; 600, Guide shoe; 601, Squeeze hole; 700, Switch valve body; 701, Valve body ratchet;

[0038] 901, First sealing ring; 902, Second sealing ring; 903, Third sealing ring; 904, Fourth sealing ring; 905, Fifth sealing ring; 906, Sealing ring. Detailed implementation manners

[0039] To make the technical problems solved by the present invention, the technical solutions adopted and the achieved technical effects clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention.

[0040] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected" and "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0041] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0042] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and through specific embodiments.

[0043] As Figures 1 - 6 shown, this embodiment provides a one-trip hydraulic setting cement retainer for plugging a casing, which includes a construction module and a retainer module; the construction module includes a construction main body 100 and a shear pawl 300. The construction main body 100 is penetrated with a hydraulic channel, and a plugging assembly is installed in the hydraulic channel. The plugging assembly can seal the hydraulic channel. The plugging assembly is connected to the inner wall of the hydraulic channel through a ball seat pin 150. When the ball seat pin 150 is cut off, the plugging assembly disengages from the hydraulic channel. The shear pawl 300 is sleeved on the construction main body 100, and the shear pawl 300 is connected to the construction main body 100 through a shear pin 129. When the shear pin 129 is cut off, the shear pawl 300 can move along the length direction of the construction main body 100; the retainer module includes a retainer main body, a setting assembly and a switch valve body 700. The setting assembly is sleeved on the retainer main body. The retainer main body can be set with the casing through the setting assembly. The retainer main body is detachably connected to the shear pawl 300. The switch valve body 700 can reciprocate between an injection position and a closing position along the length direction of the construction main body 100. The construction main body 100 is selectively connected to the switch valve body 700 and can drive the switch valve body 700. The switch valve body 700 located at the injection position can conduct the casing, and the switch valve body 700 located at the closing position can block the casing.

[0044] This one - trip hydraulic setting cement retainer, through the design that the shear pawl 300 is sleeved on the construction main body 100 and the retainer main body is detachably connected to the shear pawl 300, can cooperate with the setting of the shear pin 129, so that the construction main body 100 and the retainer main body are fixedly connected before the shear pin 129 is cut off, and the construction main body 100 guides the retainer main body after the shear pin 129 is cut off. The above improvements ensure the relative position determination of the construction main body 100 and the retainer main body in the corresponding stages. The design that the retainer main body is detachably connected to the shear pawl 300 realizes the selective connection of the construction module and the retainer module, enabling the construction module to be recovered after construction is completed, greatly reducing the construction cost. Similarly, the setting of the plugging assembly and the ball seat pin 150 on the plugging assembly makes the hydraulic pressure in the hydraulic channel relieve pressure only after reaching a predetermined pressure, so that the setting operation of the setting assembly can be successfully completed in an environment that meets the pressure requirements, ensuring the setting reliability of the retainer module. The design that the construction main body 100 is selectively connected to the switch valve body 700 and can drive the switch valve body 700 to move enables the operator to smoothly complete the operation of conducting or blocking the casing by means of the construction main body 100. At the same time, the construction main body 100 can also smoothly disengage from the switch valve body 700, ensuring that the separation of the construction module and the retainer module can be successfully completed. The above structural improvements can complete the procedures of running in, setting, checking sealing, squeezing injection, and releasing in one trip of drilling. At the same time, operations such as checking sealing and trial squeezing can also be carried out. The separate design of the construction module and the retainer module enables the repeated plugging and unplugging actions to be successfully completed. This one - trip hydraulic setting cement retainer is simple to operate, has a wide application range, high construction efficiency, and low operating cost.

[0045] In this embodiment, the one - trip hydraulic setting cement retainer further includes a hydraulic device. The hydraulic device is connected to the hydraulic channel through an oil pipe, and the hydraulic device increases the hydraulic pressure in the hydraulic channel by injecting liquid into the hydraulic channel.

[0046] In actual production, this one - trip hydraulic setting cement retainer is vertically placed in the casing in the order from the construction module to the retainer module.

[0047] In other implementation manners of this embodiment, the plugging assembly is selected as other bridge plug structures.

[0048] In the squeezing injection state, the setting assembly completes the overall setting. After the cement slurry flows through the construction main body 100 and the retainer main body in sequence through the retainer, the cement slurry is squeezed into the annular space between the retainer main body and the bottom of the casing, so that the cement slurry fills the well section to be sealed or enters the cracks and pores of the formation to achieve the purpose of plugging and leak - filling.

[0049] In this embodiment, the setting assembly includes a piston sleeve 200. The piston sleeve 200 is sleeved on the construction main body 100. The piston sleeve 200 is connected to the outer side wall of the construction main body 100 through piston pins 220. The piston sleeve 200 and the construction main body 100 enclose a pressure-containing cavity. The hydraulic channel communicates with the pressure-containing cavity. The shear force received by the piston pins 220 can increase as the pressure-containing cavity increases. After the piston pins 220 are cut off, the piston sleeve 200 can move towards the bottom end of the construction main body 100; an elastic sleeve 530 is sleeved on the retainer main body. An upper slip 410 is clamped between the elastic sleeve 530 and the piston sleeve 200, and a lower slip 420 is clamped between the elastic sleeve 530 and the retainer main body. The broken upper slip 410 and the broken lower slip 420 can both be inserted into the side wall of the casing.

[0050] Preferably, pin positioning holes 113 are formed on the outer peripheral surface of the construction main body 100, and the piston pins 220 are inserted into the pin positioning holes 113. Specifically, the elastic sleeve 530 is made of rubber.

[0051] When the hydraulic equipment applies force to the setting assembly for setting, the plugging assembly closes the hydraulic channel, and pressure is applied by pouring hydraulic agent into the hydraulic channel. The hydraulic agent can enter the pressure-containing cavity and apply a downward force to the piston sleeve 200 until the piston pins 220 are cut off. Then, the hydraulic agent drives the piston sleeve 200 to move downward, so that the setting assembly is set under the pressure of the hydraulic agent. Specifically, the hydraulic agent is completion fluid or clear water.

[0052] Preferably, a first sealing ring 901 and a second sealing ring 902 are clamped between the piston sleeve 200 and the construction main body 100. The pressure-containing cavity is located between the first sealing ring 901 and the second sealing ring 902. The above design ensures that the piston sleeve 200 always maintains the sealing performance of the pressure-containing cavity when sliding relative to the construction main body 100, thereby improving the sealing effect between the piston sleeve 200 and the construction main body 100.

[0053] In this embodiment, the construction main body 100 includes an upper joint 110, a mandrel 120, and a sealing plug 130 that are connected end to end. The upper joint 110 and the mandrel 120 are screwed together and sealed by a third sealing ring 903. The mandrel 120 and the sealing plug 130 are screwed together and sealed by a fifth sealing ring 905. The hydraulic channel is formed by connecting end to end a joint through hole 111 penetrating through the upper joint 110, a mandrel through hole 121 penetrating through the mandrel 120, and a plug through hole 131 penetrating through the sealing plug 130. The shear pawl 300 is sleeved on the mandrel 120. A mandrel slide rail 127 is provided on the mandrel 120. A key block 128 for limiting the shear pawl 300 is provided on the mandrel slide rail 127. The shear pawl 300 can slide reciprocally on the mandrel slide rail 127, and the length direction of the mandrel slide rail 127 is parallel to the length direction of the construction main body 100.

[0054] After the shear pin 129 is cut off, the operator can drive the construction main body 100, the retainer main body, and the switch valve body 700 connected to the retainer main body by dragging the tubing, so as to realize the switching of the switch valve body 700 between the injection position and the closed position, thus facilitating the completion of the subsequent operation steps of the one-trip hydraulic setting cement retainer. At the same time, the movement of the construction main body 100 relative to the retainer main body is stopped when the outer wall side of the construction main body 100 abuts against the inner wall side of the retainer main body. When the construction main body 100 moves to two extreme positions, the switch valve body 700 is respectively driven to the closed position and the injection position.

[0055] Specifically, the shear pawl 300 has a left-handed thread, and the tail of the left-handed thread is cut into a pawl shape, so that the left-handed thread can contract and catch on the thread of the retainer module when pressed down.

[0056] Furthermore, the top end of the elastic sleeve 530 is provided with an upper cone 510 in contact with the upper slip 410, and the bottom end of the elastic sleeve 530 is provided with a lower cone 520 in contact with the lower slip 420. Both the upper cone 510 and the lower cone 520 gradually narrow towards the retainer main body in a direction away from the elastic sleeve 530. The gradually narrowing structure of the upper cone 510 and the lower cone 520 ensures the accurate matching of the cone and the slip, enables the position where the slip breaks to be adjustable, and further guarantees the positioning effect of the retainer module on the casing.

[0057] Still further, the retainer main body includes a central tube 560 and a guide shoe 600 fixedly connected to the bottom end of the central tube 560. The elastic sleeve 530 is sleeved on the central tube 560, and the lower slip 420 is clamped between the bottom end of the elastic sleeve 530 and the top end of the guide shoe 600. Specifically, an injection hole 601 is opened on the side wall of the guide shoe 600 and communicates with the central tube 560.

[0058] Preferably, the central tube 560 is screwed to the guide shoe 600, and inner back rings 550 and outer back rings 540 are symmetrically installed at the end of the elastic sleeve 530. The setting of the inner back rings 550 and the outer back rings 540 can prevent the elastic sleeve 530 from generating shoulder protrusions after setting, thereby enhancing the sealing performance of the elastic sleeve 530.

[0059] In this embodiment, a lock ring with a ratchet thread is also sleeved on the central tube 560, and the tooth direction of the ratchet thread faces left, which makes the upper cone 510 can only move from left to right, so that the retainer module can be permanently locked after setting.

[0060] Preferably, a fourth sealing ring 904 is clamped between the switch valve body 700 and the guide shoe 600, and a sealing ring 906 is vulcanized on the switch valve body 700. With the arrangement of the fourth sealing ring 904 and the sealing ring 906, the sealing between the switch valve body 700 and the guide shoe 600 can be achieved when the switch valve body 700 is in the closed position.

[0061] In this embodiment, an outer ring slide rail 562 is annularly arranged on the inner side wall of the central pipe 560, and the construction main body 100 slides on the outer ring slide rail 562.

[0062] During setting, the hydraulic agent enters the pressure-containing cavity from the pressure-transmitting hole 122 to apply force to the piston sleeve 200. When the pressure rises to reach the first pressure value, the piston pin 220 will be sheared off, causing the piston sleeve 200 to move downward, and sequentially pushing the upper slip 410, the upper cone 510, the elastic sleeve 530, the lower cone 520 and the lower slip 420 to move downward along the length direction of the construction main body 100. As the downward stroke gradually increases, the distance between the piston sleeve 200 and the guide shoe 600 gradually decreases. When the pressure rises to reach the second pressure value, the upper slip 410 breaks and gets stuck on the inner wall of the casing. After the pressure further rises, the elastic sleeve 530 will be compressed, causing the elastic sleeve 530 to gradually expand and the outer diameter to become larger, and finally causing the lower slip 420 to break and get stuck on the inner wall of the casing to achieve setting.

[0063] In the set state, the holding module forms a two-way anchor at the designated position of the casing through the upper slip 410 and the lower slip 420, and forms a two-way seal at the designated position of the casing through the sealing system of the upper cone 510, the elastic sleeve 530 and the lower cone 520. When the pressure rises to reach the third pressure value, the ball seat pin 150 will be sheared off, causing the plugging assembly to move down to the bottom end of the hydraulic channel, and at this time the holding module has completed setting.

[0064] The outer side wall of the upper slip 410 is provided with first slip teeth 411 that are inserted and matched with the inner side wall of the casing, and the outer side wall of the lower slip 420 is provided with second slip teeth 421 that are inserted and matched with the inner side wall of the casing. The reverse tooth-like structure on the slip teeth can lock the position of the holding module in the set state, avoiding the problem that the holding module slides and causes the setting to become loose.

[0065] The upper cone 510 is fixed to the central pipe 560 through an upper rolled leather pin 511, and the lower cone 520 is fixed to the central pipe 560 through a lower rolled leather pin 521. The arrangement of the upper rolled leather pin 511 and the lower rolled leather pin 521 can avoid the friction between the shoulder of the elastic sleeve 530 and the casing when the elastic sleeve 530 expands and sets, avoiding the risk of damage to the shoulder of the elastic sleeve 530, and ensuring the setting firmness of the elastic sleeve 530.

[0066] Preferably, the outer wall of the shear pawl 300 is screwed to the inner wall of the central tube 560, and a pawl pin 310 is inserted through both the shear pawl 300 and the central tube 560. After the pawl pin 310 is cut off, the central tube 560 can be separated from the shear pawl 300. The above design realizes the detachable connection between the shear pawl 300 and the retainer module, enabling the operator to drive the shear pawl 300 to separate from the central tube 560 by rotating the construction main body 100, thus facilitating the smooth release of the construction module. The setting of the pawl pin 310 realizes the positioning effect of the shear pawl 300 and the central tube 560, reducing the risk of premature separation of the shear pawl 300 and the retainer module due to accidents and ensuring the smooth operation of the one-trip hydraulic setting cement retainer.

[0067] The setting of the key block 128 ensures that the central tube 560 rotated to any angle can transmit torque to the shear pawl 300, thus helping to improve the effect of driving the shear pawl 300 when the shear pawl 300 separates from the central tube 560 and ensuring that the shear pawl 300 can be separated smoothly.

[0068] Specifically, a first limiting hole is provided on the shear pawl 300, a second limiting hole is provided on the central tube 560, and the pawl pin 310 is inserted through the first limiting hole and the second limiting hole at the same time.

[0069] When disassembling the shear pawl 300 from the retainer main body, the operator can drive the shear pawl 300 to rotate by lifting the setting assembly and rotating the tubing at the same time to complete the disassembly action.

[0070] In this embodiment, a ring-shaped V-groove is provided in the middle of the inner wall of the elastic sleeve 530, and a retaining ring 532 is arranged in the V-groove. The retaining ring 532 is in sealing cooperation with the elastic sleeve 530 through a socket ring 531, and the socket ring 531 is sleeved on the outer wall of the central tube 560. The above design is simple and reliable, ensuring the stable connection between the elastic sleeve 530 and the central tube 560, reducing the risk of large displacement of the elastic sleeve 530 due to extrusion deformation, thereby improving the setting efficiency and ensuring the setting effect.

[0071] Specifically, the elastic sleeve 530 can drive the retaining ring 532 and the socket ring 531 to move. The setting of the V-groove helps to improve the deformation ability of the elastic sleeve 530 and also improves the sealing performance of the elastic sleeve 530 sleeved on the central tube 560.

[0072] Preferably, a plurality of screw slide rails 112 are evenly distributed at intervals on the outer wall of the construction main body 100. The length direction of the screw slide rails 112 is parallel to the length direction of the construction main body 100. A limit screw 210 is installed on the piston sleeve 200. The limit screw 210 has the same number as the screw slide rails 112 and corresponds to each other one by one. The screw of the limit screw 210 is placed in the screw slide rail 112.

[0073] With the cooperation of the limit screw 210 and the screw slide rail 112, the piston sleeve 200 can smoothly complete the action of sliding relative to the construction main body 100, ensuring that the piston sleeve 200 can smoothly complete the setting operation according to the predetermined trajectory.

[0074] Meanwhile, when the limit screw 210 moves downward along the length direction of the screw slide rail 112, the limit screw 210 stops at the groove wall of the screw slide rail 112. The above design enables the piston sleeve 200 to smoothly disengage from the casing under the drive of the construction main body 100 after the construction main body 100 is separated from the retainer main body.

[0075] In this embodiment, the retainer main body is penetrated with an injection hole 601, the retainer main body is provided with a retainer seat groove, the groove wall of the retainer seat groove is provided with a pawl positioning groove 561, the switch valve body 700 is provided with a valve body pawl 701, the switch valve body 700 in the closed position closes the injection hole 601, and the valve body pawl 701 is in close fit with the pawl positioning groove 561. Specifically, the retainer seat groove is provided on the guide shoe 600. The above structural improvement can quickly complete the disassembly process when the injection hole 601 is just blocked and the cement slurry has not solidified, so as to perform other operations in the well during the solidification process of the cement slurry. The work is stable and the structure is reliable, realizing the efficient positioning of the switch valve body 700 and ensuring the smooth operation of the one-trip hydraulic setting cement retainer.

[0076] Preferably, a plug positioning groove is provided on the outer side wall of the sealing plug 130. When the valve body pawl 701 is pushed by the inner wall of the central tube 560, it will be pushed into the plug positioning groove. At this time, the switch valve body 700 is connected to the central tube 560; when the plug positioning groove is communicated with the pawl positioning groove 561, the valve body pawl 701 will automatically reset and be buckled in the pawl positioning groove 561. At this time, the switch valve body 700 is separated from the central tube 560.

[0077] Specifically, the closed position is located above the injection position. The above structure enables the operator to drive the switch valve body 700 at the injection position to move by pulling up the sealing plug 130, so as to realize the communication between the plug positioning groove and the pawl positioning groove 561, so that the switch valve body 700 is separated from the central tube 560 and the switch valve body 700 is left in the closed position; the operator can also make the valve body pawl 701 enter the plug positioning groove from the pawl positioning groove 561 under the push of external force by pressing down the sealing plug 130, and the continuous pressing down of the sealing plug 130 can block the plug positioning groove and the pawl positioning groove 561, so that the switch valve body 700 leaves the closed position and moves towards the injection position.

[0078] Preferably, the plugging assembly includes a ball seat ring 140 and a setting ball 160. The ball seat ring 140 is provided with a vent hole. The side wall of the ball seat ring 140 is connected to the inner wall of the hydraulic channel through a ball seat pin 150. The setting ball 160 placed in the hydraulic channel can press against the ball seat ring 140 to close the vent hole. The setting ball 160 can move to the position of the plugging ball seat ring 140 under its own weight and the action of a small-displacement liquid flow, and form a seal. The design of the ball seat ring 140 and the setting ball 160 enables the operator to close the hydraulic channel by dropping the setting ball 160 into the hydraulic channel after the one-trip hydraulic setting cement retainer is lowered into the well as a whole in one trip.

[0079] This embodiment also provides a one-trip hydraulic setting method, which is applied to the above-mentioned one-trip hydraulic setting cement retainer, and includes the following steps:

[0080] Step 1: Place the one-trip hydraulic setting cement retainer in the casing from top to bottom.

[0081] Step 2: Close the hydraulic channel with the plugging assembly.

[0082] Step 3: Increase the hydraulic pressure in the hydraulic channel to set the retainer body against the casing.

[0083] Step 4: Continue to increase the hydraulic pressure in the hydraulic channel until the shear pin 129 is cut off, so that the construction body 100 can drive the switch valve body 700 to move.

[0084] Step 5: Continue to increase the hydraulic pressure in the hydraulic channel until the ball seat pin 150 is cut off, so that the plugging assembly drops to the bottom of the hydraulic channel and the hydraulic channel is depressurized.

[0085] Step 6: Apply gravity to the one-trip hydraulic setting cement retainer to judge the anchoring condition of the retainer body.

[0086] Step 7: Pull the construction body 100 to move the switch valve body 700 to the closed position.

[0087] Step 8: Conduct an annulus pressure test and a central pipe pressure test on the retainer module, and debug and judge the sealing performance of the retainer module.

[0088] Step 9: Pull the construction body 100 to move the switch valve body 700 to the squeezing position.

[0089] Step 10: Squeeze cement into the retainer module until the space below the retainer module is filled with cement, and then pull the construction body 100 to move the switch valve body 700 to the closed position.

[0090] Step 11: After the cement solidifies, remove the shear pawl 300 from the retainer body, separate the construction module from the retainer module, and move the construction module out of the casing.

[0091] By adopting this one-trip hydraulic setting method, the procedures of running in, setting, seal checking, squeezing and releasing of the one-trip hydraulic setting cement retainer can be efficiently completed, optimizing the construction process, simplifying the construction procedures, thus reducing the workload of operators, improving the construction efficiency and ensuring the construction effect.

[0092] After setting, it is necessary to judge whether the retainer module is reliably set. For this purpose, a pressure test procedure is required. By applying tonnage in the way of pressing down the construction main body 100 at the wellhead, the anchoring situation of the retainer module can be judged. At the same time, by pulling up the construction main body 100, the switch valve body 700 can be driven to move upward, moving the switch valve body 700 to the squeezing position to completely seal the bottom end of the construction main body 100. At this time, by carrying out annulus pressure test and central pipe pressure test, the sealing performance of the cement retainer rubber barrel and the bottom valve body can be judged, providing a reliable basis for the success of the squeezing construction.

[0093] Specifically, the gravity acting on the one-trip hydraulic setting cement retainer is applied through the tubing.

[0094] During the releasing procedure, the construction main body 100 needs to be pulled up to the pre-releasing position first, and then the construction main body 100 is rotated clockwise to shear the pawl pin 310, so that the left-handed thread on the shear pawl 300 is completely disengaged from the central pipe 560. Thus, the releasing procedure is completed. When the switch valve body 700 is in the closed position at this time, it can prevent the cement squeezed into the formation from causing accidents due to backflow before solidification.

[0095] Obviously, the above-mentioned embodiments of the present invention are only examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. One-trip hydraulic setting cement retainer for plugging casing, characterized in that, Comprising: A construction module, including a construction main body (100) and a shear pawl (300). The construction main body (100) is penetrated with a hydraulic channel, and a plugging component is installed in the hydraulic channel. The plugging component can seal the hydraulic channel. The plugging component is connected to the inner wall of the hydraulic channel through a ball seat pin (150). When the ball seat pin (150) is cut off, the plugging component disengages from the hydraulic channel. The shear pawl (300) is sleeved on the construction main body (100), and the shear pawl (300) is connected to the construction main body (100) through a shear pin (129). When the shear pin (129) is cut off, the shear pawl (300) can move along the length direction of the construction main body (100); A retaining module, including a retaining main body, a setting assembly and a switch valve body (700). The setting assembly is sleeved on the retaining main body. The retaining main body can be set with the casing through the setting assembly. The retaining main body is detachably connected to the shear pawl (300). The switch valve body (700) can reciprocate between an injection position and a closed position along the length direction of the construction main body (100). The construction main body (100) is selectively connected to the switch valve body (700) and can drive the switch valve body (700). The switch valve body (700) located at the injection position can conduct the casing, and the switch valve body (700) located at the closed position can block the casing; The setting assembly includes a piston sleeve (200). The piston sleeve (200) is sleeved on the construction main body (100). The piston sleeve (200) is connected to the outer side wall of the construction main body (100) through a piston pin (220). The piston sleeve (200) and the construction main body (100) enclose a pressure-containing cavity. The hydraulic channel communicates with the pressure-containing cavity. The shear force received by the piston pin (220) can increase with the increase of the pressure-containing cavity. When the piston pin (220) is cut off, the piston sleeve (200) can move towards the bottom end of the construction main body (100); An elastic sleeve (530) is sleeved on the retaining main body. An upper slip (410) is clamped between the elastic sleeve (530) and the piston sleeve (200), and a lower slip (420) is clamped between the elastic sleeve (530) and the retaining main body. The broken upper slip (410) and the broken lower slip (420) can both be inserted into the side wall of the casing; The retaining main body includes a central tube (560) and a guide shoe (600) fixedly connected to the bottom end of the central tube (560); A ring-shaped V-groove is provided in the middle of the inner wall of the elastic sleeve (530). A retaining ring (532) is arranged in the V-groove. The retaining ring (532) is in sealing cooperation with the elastic sleeve (530) through a socket ring (531). The socket ring (531) is sleeved on the outer wall of the central tube (560); The main body of the retainer is penetrated with an extrusion hole (601). The main body of the retainer is provided with a retaining seat groove, and the groove wall of the retaining seat groove is provided with a pawl positioning groove (561). The switch valve body (700) is provided with a valve body pawl (701). The switch valve body (700) in the closed position closes the extrusion hole (601), and the valve body pawl (701) is in close fit with the pawl positioning groove (561).

2. The one-trip hydraulic setting cement retainer according to claim 1, wherein, The top end of the elastic sleeve (530) is provided with an upper cone (510) that contacts the upper slip (410). The bottom end of the elastic sleeve (530) is provided with a lower cone (520) that contacts the lower slip (420). Both the upper cone (510) and the lower cone (520) gradually narrow towards the main body of the retainer in a direction away from the elastic sleeve (530).

3. The one-trip hydraulic setting cement retainer according to claim 2, wherein, The elastic sleeve (530) is sleeved on the central tube (560). The lower slip (420) is clamped between the bottom end of the elastic sleeve (530) and the top end of the guide shoe (600).

4. The one-trip hydraulic setting cement retainer according to claim 3, characterized in that, The outer side wall of the shear pawl (300) is screwed to the inner side wall of the central tube (560), and a pawl pin (310) is simultaneously passed through the shear pawl (300) and the central tube (560). After the pawl pin (310) is cut off, the central tube (560) can be separated from the shear pawl (300).

5. The one-trip hydraulic setting cement retainer according to claim 1, characterized in that, A plurality of screw slide rails (112) are evenly distributed at intervals on the outer side wall of the construction main body (100). The length direction of the screw slide rails (112) is parallel to the length direction of the construction main body (100). A limit screw (210) is installed on the piston sleeve (200). The limit screw (210) is the same in number as and corresponds to the screw slide rails (112) one by one, and the screw rod of the limit screw (210) is placed in the screw slide rails (112).

6. The one-trip hydraulic setting cement retainer according to any one of claims 1-5, characterized in that, The plugging assembly includes a ball seat ring (140) and a setting ball (160). The ball seat ring (140) is penetrated with a ventilation hole. The side wall of the ball seat ring (140) is connected to the inner side wall of the hydraulic channel through the ball seat pin (150). The setting ball (160) placed in the hydraulic channel can press against the ball seat ring (140) to close the ventilation hole.

7. One-trip hydraulic setting method, applied to the one-trip hydraulic setting cement retainer according to any one of claims 1-6, characterized in that, Including the following steps: S1: Place the one-trip hydraulic setting cement retainer vertically downward into the casing; S2: Make the plugging assembly close the hydraulic channel; S3: Increase the hydraulic pressure in the hydraulic channel to make the main body of the retainer set with the casing; S4: Continue to increase the hydraulic pressure in the hydraulic channel until the shear pin (129) is cut off, so that the construction main body (100) can drive the switch valve body (700) to move; S5: Continue to increase the hydraulic pressure in the hydraulic channel until the ball seat pin (150) is cut off, so that the plugging assembly drops to the bottom of the hydraulic channel and the hydraulic channel is depressurized; S6: Apply gravity to the one-trip hydraulic setting cement retainer to judge the anchoring condition of the main body of the retainer; S7: Pull the construction main body (100) to move the switch valve body (700) to the closed position; S8: Conduct an annulus pressure test and a central pipe pressure test on the retainer module, and debug and judge the sealing performance of the retainer module; S9: Pull the construction main body (100) to move the switch valve body (700) to the squeezing position; S10: Squeeze cement into the retainer module until the cement fills the lower part of the retainer module, and then pull the construction main body (100) to move the switch valve body (700) to the closed position; S11: After the cement solidifies, disassemble the shear pawl (300) from the retainer main body, separate the construction module from the retainer module, and move the construction module out of the casing.

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