Well completion packer with adjustable slip starting sequence, packing method and pressure test tool

Abstract

The invention provides a well completion packer with an adjustable slip starting sequence, a packing method and a pressure testing frock wherein the packer comprises a central tube, a lower mandrel, a setting driving mechanism, a first slip mechanism, a second slip mechanism and a rubber sleeve mechanism, the lower mandrel is in butt joint with the central tube, the setting driving mechanism is sleeved on the lower mandrel and the central tube, and the first slip mechanism and the second slip mechanism are in butt joint with the rubber sleeve mechanism. The first slip mechanism, the rubber sleeve mechanism and the second slip mechanism are sequentially arranged on the center pipe in a sleeving mode from top to bottom and located above the setting driving mechanism. The first slip mechanism comprises a first slip, the second slip mechanism comprises a second slip, the rubber sleeve mechanism comprises a rubber sleeve assembly, and the first slip, the rubber sleeve assembly and the second slip are arranged on the central pipe in a sleeving mode. A pressure transmitting hole is formed in the lower mandrel, drilling fluid in the lower mandrel can pressurize the setting driving mechanism along the pressure transmitting hole, the setting driving mechanism can move upwards and enable the rubber sleeve assembly to expand and set, and then the first slip and the second slip are pushed to be set and hung according to a set sequence. The setting sequence of the first slip and the second slip can be switched according to operation requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of downhole tools for oil and gas drilling. Specifically, it relates to a completion packer with adjustable slip starting sequence, a packing method and a pressure testing tooling. Background Art

[0002] A completion packer is a key tool for the transfer of an oil and gas well from drilling completion to production. It can effectively isolate the space between the oil and casing, prevent formation fluids from directly acting on the casing, and prevent the casing from being crushed by high pressure and corroded. At present, completion packers at home and abroad are all operated hydraulically. Under the push of a hydraulic cylinder, the slips and rubber barrel assemblies of the packer squeeze the rubber barrel of the packer to expand from top to bottom, and the expanded rubber barrel tightly adheres to the casing wall to achieve sealing.

[0003] The completion packer in the prior art needs to be placed in the completion string. After the string is lowered to the designated position, steel balls with a specified outer diameter are put into the tubing string. The steel balls fall onto the arc-shaped end face of the setting ball seat mandrel to achieve metal-metal single sealing. At this time, fluid is pumped into the string to increase the hydraulic pressure. When the hydraulic pressure reaches the starting setting pressure of the packer, the setting shear pin of the packer is cut, and the setting mandrel starts to move downward or upward. One set of slips is pressured to cut the limit pin, and the slips lean against the casing and start to move downward or upward. The rubber barrel and the other set of slips simultaneously bear the axial pressure, and the rubber barrel starts to expand under the pressure. When the continuously applied pressure exceeds the shear value of the limit pin of the other set of slips, the other set of slips starts to open and bite into the casing. When the hydraulic setting force in the tubing reaches the full setting pressure of the rubber barrel, the rubber barrel fully expands to seal the gap between the oil and casing. During the setting process of the rubber barrel, the two sets of slips and the rubber barrel are in a linkage state. The rubber barrel must have enough compression space for full setting. Otherwise, the rubber barrel will not be able to fully expand due to insufficient radial space. However, this linkage method must ensure that the movement stroke of the slips completely conforms to the designed movement stroke. In actual engineering applications, if the casing is deformed or the inner wall cleanliness is poor, it is very easy to cause the movement stroke of the slips to be out of place, and the rubber barrel cannot fully expand, resulting in poor sealing performance of the rubber barrel and affecting the safety of the production string. Therefore, it is urgent to invent a completion packer with adjustable slip starting sequence to solve the above problems in view of the deficiencies of the prior art.

[0004] Chinese patent application with publication number CN116291298A discloses a high-temperature and high-pressure resistant ultra-deep slim-hole completion packer. The rubber barrel in the middle of the packer is made of hydrogenated nitrile rubber and fluororubber materials; the length of the rubber barrel is 106 mm - 110 mm; the slips at the bottom of the packer are insert teeth. The high-temperature and high-pressure resistant ultra-deep slim-hole completion packer of the present utility model is applicable to wells where well completion operations are carried out by setting the packer in 5-1 / 2" casing under high temperature and high pressure, meeting the high-temperature and high-pressure downhole environment and high strength, and the setting requirements of 5-1 / 2" casing with a small wall thickness, and can be safely set in casing of steel grade 140V at most. When setting the packer by pressure, the hydraulic pressure acts on the upper piston and the lower piston. First, the lower piston moves downward to cut off the lock ring retaining ring and each shear pin on the slips sleeve, and the lower piston drives the upper cone to move downward, thus expanding the slips to complete the setting; at the same time, after the upper piston moves upward to cut off the shear pin on the oil drain sleeve, the upper piston drives the steel cylinder and the oil drain sleeve guide ring to continue moving upward to compress the rubber barrel. The higher the pressure, the greater the thrust of the upper piston, the more solid the rubber barrel is compressed, and the more significant the sealing effect; the cones at both ends of the slips are squeezed into the slips more, the two-way slips open wider, and the two-way anchoring is more effective. At the same time, the unique ratchet lock ring device of the packer will lock and maintain the setting force, so that the slips and the rubber barrel are set permanently and effectively. The slips of this structure are located below the rubber barrel and will not have a limiting relationship with the rubber barrel, which is different from the packer structure of this case.

[0005] Chinese patent application with publication number CN215369781U discloses a completion packer, including a housing, a bellows and an adjustment assembly; the housing includes a central tube, and an annular sleeve is arranged on the inner wall of the central tube. One end of the annular sleeve is provided with a plurality of first slots and second slots arranged circumferentially and alternately, and the depths of the first slots and the second slots are different; the bellows is sleeved outside the central tube and forms a pressure chamber with the outer wall of the central tube; the adjustment assembly includes a push tube, a rotary valve and a spring. The push tube is axially slidably connected with the inner wall of the annular sleeve, and guiding teeth are arranged on the push tube circumferentially. One side of the rotary valve is provided with rotary guiding keys arranged circumferentially and evenly, and the rotary guiding keys are slidably abutted against the guiding teeth. A plurality of rotary guiding keys are respectively clamped with a plurality of first slots or a plurality of rotary guiding keys are respectively clamped with a plurality of second slots; it solves the problem that the existing hydraulic packer needs to continuously increase the displacement of the drilling fluid to expand the bellows. This packer realizes the sealing of the annulus space between the oil pipe and the casing through the bellows, which is different from the sealing method of this case through the rubber barrel and the slips.

[0006] A Chinese patent application with the publication number CN116291298A discloses a completion packer with an anti-displacement structure, which includes an upper joint, an upper connecting sleeve, a lower connecting cylinder sleeve and a lower joint. An anti-displacement connecting pipe is fixedly connected between the upper joint and the upper connecting sleeve. The anti-displacement connecting pipe is provided with a docking base, and an anti-displacement top seat is arranged on the docking base. A position sensor is arranged inside the anti-displacement top seat. During the process of lowering the whole packer inside the casing of an oil and gas well, the anti-displacement top seat is quickly installed on the packer. The position sensor built in the anti-displacement top seat is used to determine the overall position state of the packer in real time. The setting of multiple anti-displacement top seats enables multiple position sensors to transmit information synchronously for comparison. When data anomalies occur, the whole packer is taken out for maintenance, and the device is convenient to maintain. This patent is about quickly installing the anti-displacement top seat on the packer during the process of lowering the whole packer inside the casing of an oil and gas well, using the position sensor built in the anti-displacement top seat to determine the overall position state of the packer in real time, and monitoring the position information of the whole packer in real time to avoid the packer from being misaligned or displaced, ensuring good stability of the packer during operation, avoiding the situation where seal failure cannot be rectified in time, and meeting the use requirements. This invention patent is different from this case. Summary of the Invention

[0007] The purpose of the present invention is to solve at least one of the above-mentioned deficiencies existing in the prior art. For example, one of the purposes of the present invention is to provide a completion packer, a sealing method and a pressure testing tooling with an adjustable slip starting sequence to overcome the problem that the slip and the rubber barrel are linked during the setting process of the rubber barrel of the existing packer, resulting in insufficient setting of the rubber barrel, realizing an adjustable slip starting sequence, and avoiding the rubber barrel from not being able to fully expand due to the premature anchoring of the slip, so as to improve the sealing performance of the rubber barrel.

[0008] To achieve the above purpose, on the one hand, the present invention provides a completion packer with an adjustable slip starting sequence. The packer may include a central pipe, a lower mandrel, a setting drive mechanism, a first slip mechanism, a second slip mechanism and a rubber barrel mechanism. Among them, the lower mandrel is fixedly connected to the lower end of the central pipe. The setting drive mechanism is sleeved on the lower mandrel and the central pipe. The first slip mechanism, the rubber barrel mechanism and the second slip mechanism are sequentially sleeved on the central pipe from top to bottom and are located above the setting drive mechanism. The first slip mechanism includes a first slip, the second slip mechanism includes a second slip, and the rubber barrel mechanism includes a rubber barrel assembly. The first slip, the rubber barrel assembly and the second slip are all sleeved on the central pipe. A radially penetrating pressure transmission hole is provided on the side wall of the lower mandrel. The drilling fluid pressure in the lower mandrel can be applied to the lower end of the setting drive mechanism through the pressure transmission hole. The setting drive mechanism can move upward under the drilling fluid pressure and push the rubber barrel assembly to expand radially for setting, and then push the first slip and the second slip to open and hang radially in a set order.

[0009] Optionally, the setting driving mechanism may include a piston, a first pressure transmission sleeve, and a second pressure transmission sleeve. The piston is sleeved on the lower mandrel, the first pressure transmission sleeve is sleeved on the upper end of the piston and the lower mandrel, the second pressure transmission sleeve is sleeved on the central tube and penetrates through the upper end of the first pressure transmission sleeve. The piston can be driven by the drilling fluid pressure passing through the pressure transmission hole and push the first pressure transmission sleeve and the second pressure transmission sleeve to move upward together, driving the first slip, the second slip, and the rubber barrel assembly to set.

[0010] Optionally, the packer may further include a lower sub and a starting shear pin. The lower sub is sleeved on the lower end of the lower mandrel and the piston, and the lower sub is connected to the piston through the starting shear pin. After being subjected to the drilling fluid pressure, the piston can cut off the starting shear pin and move upward.

[0011] Optionally, the packer may further include a locking mechanism. The locking mechanism includes an inner locking ring, a locking sleeve, a spacer ring, and an elastic member sleeved on the central tube. The lower end of the locking sleeve is sleeved and fixedly connected to the upper end of the setting driving mechanism. The upper end of the locking sleeve is connected to the second slip mechanism. The inner locking ring, the spacer ring, and the elastic member are connected in sequence from top to bottom and penetrate through the locking sleeve. The upper end of the inner locking ring abuts against the inner wall of the locking sleeve, and the lower end of the elastic member abuts against the upper end of the setting driving mechanism. The locking mechanism can be pushed upward by the setting driving mechanism to drive the first slip, the second slip, and the rubber barrel assembly to set. Inner locking teeth are provided on the inner wall of the inner locking ring, and outer locking teeth are provided on the outer wall of the central tube. The cooperation of the inner locking teeth and the outer locking teeth can prevent the locking mechanism from moving downward.

[0012] Optionally, the first slip mechanism may further include a slip seat, a torque key, a first slip sleeve, and a first shear pin. Both the slip seat and the torque key are fixedly connected to the upper end of the first slip. The torque key is sleeved and fixedly connected to the lower end of the slip seat. The first slip sleeve is arranged at the lower end of the first slip and is connected to the central tube through the first shear pin. The first slip sleeve can be subjected to an upward thrust to cut off the first shear pin and move upward, sleeving the first slip on the outer wall of the first slip sleeve, and causing the first slip to expand radially and hang.

[0013] Optionally, the second slip mechanism may further include a support sleeve, a second slip sleeve, a second shear pin, and a third shear pin. The second slip sleeve is arranged at the upper end of the second slip and is connected to the central tube through the second shear pin. The upper end of the support sleeve abuts against the lower end of the second slip sleeve, and the lower end of the support sleeve is connected to the locking sleeve through the third shear pin. The second slip sleeve can be subjected to an upward thrust applied by the locking sleeve through the support sleeve to cut off the second shear pin and move upward, compressing the rubber barrel assembly to expand and set. The locking sleeve can cut off the third shear pin after being subjected to a thrust and push the second slip to move upward relative to the second slip sleeve, sleeving the second slip on the outer wall of the second slip sleeve and causing it to expand radially and hang.

[0014] Optionally, the rubber cylinder mechanism may further include two sets of support components symmetrically installed at the upper and lower ends of the rubber cylinder assembly. One set of the two sets of support components includes a first support ring, a support spring, a second support ring, and an auxiliary support member sequentially connected from top to bottom to the upper end of the rubber cylinder assembly. The other set of the two sets of support components includes a first support ring, a support spring, a second support ring, and an auxiliary support member sequentially connected from bottom to top to the lower end of the rubber cylinder assembly. The support components are used to support and protect the rubber cylinder assembly.

[0015] Optionally, the rubber cylinder assembly may include a main rubber cylinder and two end rubber cylinders, and the two end rubber cylinders are respectively arranged at the upper and lower ends of the main rubber cylinder.

[0016] On the other hand, the present invention provides a packer sealing method. The sealing method may employ the well completion packer with adjustable slip starting sequence as described above. The sealing method may include applying pressure in the central tube to push the setting driving mechanism upward. The second slip mechanism first squeezes the rubber cylinder assembly to expand and set, then pushes the first slip to open and hang, and finally pushes the second slip to open and hang; or the second slip mechanism first squeezes the rubber cylinder assembly to expand and set, then pushes the second slip to open and hang, and finally pushes the first slip to open and hang.

[0017] On yet another aspect, the present invention provides a pressure testing tool for a packer. The pressure testing tool can be used for pressure testing operations on the well completion packer with adjustable slip starting sequence as described above. The pressure testing tool may include a locking block, a first outer cylinder, a second outer cylinder, and a third outer cylinder. The first outer cylinder, the second outer cylinder, and the third outer cylinder are fixedly connected in sequence from top to bottom. The first outer cylinder and the second outer cylinder can be sleeved outside the setting driving mechanism, and the third outer cylinder can be sleeved and fixedly connected to the lower end of the packer. The locking block can be fixedly installed between the outer wall of the setting driving mechanism and the inner wall of the first outer cylinder to prevent the setting driving mechanism from moving upward to set the packer when applying pressure in the central tube.

[0018] Compared with the prior art, the beneficial effects of the present invention include at least one of the following:

[0019] 1. For the well completion packer with adjustable slip starting sequence of the present invention, three shear pins are respectively provided between the first slip mechanism, the second slip mechanism, and between the second slip mechanism and the locking sleeve. By respectively setting the shear values of the three shear pins, the starting sequences of the first and second slips can be switched, and the rubber cylinder can be fully expanded and set first, and then the first and second slips can be hung.

[0020] 2. Design the existing hydraulic outer cylinder and lower sub into an integrated lower sub structure. Compared with the original lower sub structure, the sealing link between the original hydraulic outer cylinder and lower sub is eliminated, reducing the number of potential seal leakage points.

[0021] 3. The anti-back-off mechanism includes an inner locking ring and a cylindrical helical spring. The inner locking ring has a threaded structure with inner locking teeth inclined downward at 45°, and the corresponding central tube has a threaded structure with outer locking teeth inclined upward at 45°. During the setting process, the cylindrical helical spring continuously provides a driving force to the inner locking ring, ensuring that the sliding stroke of the inner locking ring along the central tube is consistent with the movement stroke of the piston, and the locking stroke can be stably locked without back-off, ensuring a stable setting force is applied to the rubber barrel. Brief Description of the Drawings

[0022] Through the following description in conjunction with the drawings, the above and other objects and / or features of the present invention will become clearer, where:

[0023] Figure 1 Shows the overall structure diagram of the completion packer with adjustable slip activation sequence according to an exemplary embodiment of the present invention.

[0024] Figure 2 Shows Figure 1 The partial schematic diagram at position A in

[0025] Figure 3 Shows Figure 1 The partial schematic diagram at position B in

[0026] Figure 4 Shows Figure 1 The partial schematic diagram at position C in

[0027] Explanation of Reference Numerals in the Drawings:

[0028] 1. Central tube, 2. Lower mandrel, 21. Pressure transmission hole, 3. Setting drive mechanism, 31. Piston, 32. First pressure transmission sleeve, 33. Second pressure transmission sleeve, 4. Locking mechanism, 41. Inner locking ring, 42. Locking sleeve, 43. Spacer ring, 44. Elastic member, 5. First slip mechanism, 51. First slip, 52. Slip seat, 53. Torque key, 54. First slip sliding sleeve, 55. First shear pin, 6. Second slip mechanism, 61. Second slip, 62. Support sleeve, 63. Second slip sliding sleeve, 64. Second shear pin, 65. Third shear pin, 7. Rubber barrel mechanism, 71. Rubber barrel assembly, 711. Main rubber barrel, 712. End rubber barrel, 72. Support assembly, 721. First support ring, 722. Support spring, 723. Second support ring, 724. Auxiliary support member, 8. Pressure test tooling, 81. Locking block, 82. First outer cylinder, 83. Second outer cylinder, 84. Third outer cylinder, 9. Lower sub, 10. Activation shear pin. Detailed Description of the Embodiment

[0029] In the following, the completion packer with adjustable slip starting sequence, the packing method and the pressure testing tooling of the present invention will be described in detail in conjunction with exemplary embodiments.

[0030] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0031] The terms "first" and "second" are only used for descriptive purposes, and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0032] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside 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 circumstances.

[0033] During the setting process of the rubber cylinder of the packer in the related art, the slips at both ends and the rubber cylinder are in a linkage state. For the rubber cylinder to be fully set, there must be sufficient compression space. Otherwise, the rubber cylinder cannot fully expand due to insufficient radial space. However, this linkage method must ensure that the movement stroke of the slips fully conforms to the designed movement stroke. In actual engineering applications, if the casing is deformed or the inner wall cleanliness is poor, it is very easy to cause the movement stroke of the slips to be out of place, the rubber cylinder cannot fully expand, resulting in poor sealing performance of the rubber cylinder and affecting the safety of the production string.

[0034] Based on this, the present invention provides a completion packer with adjustable slip starting sequence, a packing method and a pressure testing tooling. The packer includes a central pipe, a lower mandrel, a setting driving mechanism, a first slip mechanism, a second slip mechanism and a rubber barrel mechanism. The lower mandrel is fixedly connected to the lower end of the central pipe. The setting driving mechanism is sleeved on the lower mandrel and the central pipe. The first slip mechanism, the rubber barrel mechanism and the second slip mechanism are sequentially sleeved on the central pipe from top to bottom and are located above the setting driving mechanism. The first slip mechanism includes a first slip, the second slip mechanism includes a second slip, and the rubber barrel mechanism includes a rubber barrel assembly. The first slip, the rubber barrel assembly and the second slip are all sleeved on the central pipe. A pressure transmission hole radially penetrating through is formed in the side wall of the lower mandrel. The drilling fluid pressure in the lower mandrel can be applied to the lower end of the setting driving mechanism through the pressure transmission hole. The setting driving mechanism can move upward under the drilling fluid pressure and push the rubber barrel assembly to expand radially for setting, and then push the first slip and the second slip to open radially and hang in a set sequence.

[0035] For the completion packer with adjustable slip starting sequence of the present invention, three shear pins are respectively provided between the first slip mechanism, the second slip mechanism and between the second slip mechanism and the locking sleeve. By respectively setting the shear values of the three shear pins, the starting sequence of the first and second slips can be switched. The rubber barrel can be fully expanded and set first, and then the first and second slips can be hung. The existing hydraulic outer cylinder and the lower joint are designed into an integrated lower joint structure. Compared with the original lower joint structure, the sealing link between the original hydraulic outer cylinder and the lower joint is cancelled, and the number of potential sealing leakage points is reduced. The anti-backlash mechanism includes an inner locking ring and a cylindrical helical spring. The inner locking ring has a threaded structure with inner locking teeth inclined downward at 45°. Corresponding to the central pipe, there is a threaded structure with outer locking teeth inclined upward at 45°. During the setting process, the cylindrical helical spring continuously provides a driving force to the inner locking ring, which can ensure that the sliding stroke of the inner locking ring along the central pipe is consistent with the movement stroke of the piston, and can stably lock the stroke without backtracking, ensuring a stable setting force is applied to the rubber barrel.

[0036] Exemplary Embodiment 1

[0037] This exemplary embodiment provides a completion packer with adjustable slip starting sequence.

[0038] Figure 1 The overall structure diagram of the completion packer with adjustable slip starting sequence according to the exemplary embodiment of the present invention is shown; Figure 2 Shown is Figure 1 the partial schematic diagram at A in Figure 3 Shown is Figure 1 the partial schematic diagram at B in Figure 4 Shown is Figure 1 the partial schematic diagram at C in

[0039] As Figures 1 to 4As shown in the figure, the completion packer with adjustable slip starting sequence described in this exemplary embodiment may include a central tube 1, a lower mandrel 2, a setting drive mechanism 3, a first slip mechanism 5, a second slip mechanism 6, and a rubber barrel mechanism 7. Among them, the lower mandrel 2 is fixedly connected to the lower end of the central tube 1. Here, both the lower mandrel 2 and the central tube 1 can be hollow cylinders, and the lower mandrel 2 and the central tube 1 can be butt-jointed to form an integral body, so that their inner cavities are interconnected. Specifically, the lower mandrel 2 and the central tube 1 can be connected by screw threads; the setting drive mechanism 3 can be sleeved on the lower mandrel 2 and the central tube 1, and the first slip mechanism 5, the rubber barrel mechanism 7, and the second slip mechanism 6 can be sleeved on the central tube 1 in sequence from top to bottom, and are all located above the setting drive mechanism 3; here, the upper and lower ends of the rubber barrel mechanism 7 can be respectively abutted against the first slip mechanism 5 and the second slip mechanism 6.

[0040] The first slip mechanism 5 may include a first slip 51, the second slip mechanism 6 may include a second slip 61, and the rubber barrel mechanism 7 may include a rubber barrel assembly 71. The first slip 51, the rubber barrel assembly 71, and the second slip 61 are all sleeved on the central tube 1; a radially penetrating pressure transmission hole 21 may be provided on the side wall of the lower mandrel 2. When the packer needs to be set, drilling fluid can be input into the central tube 1 and the lower mandrel 2 and pressured. The drilling fluid in the lower mandrel 2 can flow to the outside of the lower mandrel 2 along the pressure transmission hole 21, so that the drilling fluid pressure acts on the lower end of the setting drive mechanism 3. The setting drive mechanism 3 can move axially upward under the action of the drilling fluid pressure, first push the rubber barrel assembly 71 to expand radially and set on the inner wall of the outer casing, and then push the first slip 51 and the second slip 61 to radially expand and hang on the inner wall of the outer casing in a set order; here, the set order of the first slip 51 and the second slip 61 to expand and hang respectively may be that the first slip 51 expands and hangs first, and then the second slip 61 expands and hangs, or the second slip 61 expands and hangs first, and the first slip 51 expands and hangs later; the two hanging orders can be adjusted arbitrarily according to actual operation requirements, and the present invention does not make specific limitations on this.

[0041] In this embodiment, the setting drive mechanism 3 may include a piston 31, a first pressure transmission sleeve 32, and a second pressure transmission sleeve 33. The piston 31 is sleeved on the lower mandrel 2, the first pressure transmission sleeve 32 is sleeved on the upper end of the piston 31 and the lower mandrel 2 at the same time, and the second pressure transmission sleeve 33 is sleeved on the central tube 1 and penetrates through the upper end of the first pressure transmission sleeve 32 at the same time. The piston 31 can move upward under the action of the drilling fluid pressure flowing to the outside of the lower mandrel 2 through the pressure transmission hole 21, and at the same time can push the first pressure transmission sleeve 32 and the second pressure transmission sleeve 33 to move upward together, thereby driving the first slip 51, the second slip 61, and the rubber barrel assembly 71 to achieve hanging and setting.

[0042] In this embodiment, the well completion packer with adjustable slip starting sequence described in this exemplary embodiment may further include a lower sub 9 and a starting shear pin 10. The lower sub 9 can be sleeved on the lower end of the lower mandrel 2 and the piston 31 at the same time. The lower sub 9 can be connected to the piston 31 through the starting shear pin 10. After being subjected to the drilling fluid pressure, the piston 31 can cut off the starting shear pin 10 and move upward. Here, the starting shear pin 10 can be used to temporarily fix and connect the piston 31 and the lower sub 9. When the axial thrust received by the piston 31 exceeds a certain critical value, the starting shear pin 10 can be cut off, thereby releasing the constraint between the lower sub 9 and the piston 31, and the piston 31 can be pushed to move upward. The number of installed starting shear pins 10 can be 2. The 2 starting shear pins 10 can be arranged oppositely along the radial direction of the piston 31. The number of starting shear pins 10 can also be arbitrarily selected and adjusted according to actual needs. The present invention does not make specific limitations on this.

[0043] In this embodiment, the well completion packer with adjustable slip starting sequence described in this exemplary embodiment may further include a locking mechanism 4. The locking mechanism 4 may include an inner locking ring 41, a locking sleeve 42, a spacer ring 43, and an elastic member 44 sleeved on the central tube 1. The lower end of the locking sleeve 42 can be fixedly connected to the upper end of the setting driving mechanism 3. Specifically, the lower end of the locking sleeve 42 can be sleeved on the upper end of the second pressure transfer sleeve 33 and fixedly connected to the second pressure transfer sleeve 33 through a screw thread. The upper end of the locking sleeve 42 can be connected to the second slip mechanism 6. The inner locking ring 41, the spacer ring 43, and the elastic member 44 can be connected in sequence from top to bottom and passed through the locking sleeve 42. The upper end of the inner locking ring 41 abuts against the inner wall of the locking sleeve 42. Here, the upper end of the inner locking ring 41 can be formed as an outer inclined surface, and the inner wall of the locking sleeve 42 can be formed with an inner inclined surface. The outer inclined surface of the inner locking ring 41 can match and fit with the inner inclined surface of the locking sleeve 42. The lower end of the elastic member 44 abuts against the upper end of the setting driving mechanism 3. Here, the lower end of the elastic member 44 can specifically abut against the upper end of the second pressure transfer sleeve 33. The spacer ring 43 can be installed between the inner locking ring 41 and the elastic member 44.

[0044] The locking mechanism 4 can be pushed upward by the setting driving mechanism 3, so as to drive the first slip 51, the second slip 61, and the rubber barrel assembly 71 to be set. Inner locking teeth (not shown in the figure) can be provided on the inner wall of the inner locking ring 41, and outer locking teeth (not shown in the figure) can be provided on the outer wall of the central tube 1. The inner locking teeth and the outer locking teeth can cooperate with each other to prevent the locking mechanism 4 and the setting driving mechanism 3 from moving downward, and can apply a continuous and stable setting driving force to the upper slips and the rubber barrel, ensuring the setting performance of the slips and the rubber barrel.

[0045] In this embodiment, the first slip mechanism 5 may further include a slip seat 52, a torque key 53, a first slip sleeve 54 and a first shear pin 55. The slip seat 52 and the torque key 53 may both be fixedly connected to the upper end of the first slip 51. The torque key 53 may be sleeved and fixedly connected to the lower end of the slip seat 52. The first slip sleeve 54 may be disposed at the lower end of the first slip 51 and connected to the central tube 1 through the first shear pin 55. The first slip sleeve 54 may be pushed upward to shear the first shear pin 55 and move upward, sleeving the first slip 51 on the outer wall of the first slip sleeve 54, so that the first slip 51 can be radially expanded to achieve setting and hanging. Here, the torque key 53 may connect the first slip 51 and the slip seat 52 through screws. The torque key 53 and the slip seat 52 may limit the circumferential rotation and axial movement of the first slip 51, preventing the packer from being prematurely set during the lowering process.

[0046] Specifically, the first shear pin 55 may be used to temporarily fixedly connect the first slip sleeve 54 and the central tube 1. When the axial thrust received by the first slip sleeve 54 exceeds a certain critical value, the first shear pin 55 may be sheared, thereby releasing the constraint between the first slip sleeve 54 and the central tube 1, and the first slip sleeve 54 may be pushed upward. An outer inclined surface is formed on the outer wall of the upper end of the first slip sleeve 54, and an inner inclined surface is formed on the inner wall of the lower end of the first slip 51. When the first slip sleeve 54 and the first slip 51 move toward each other, the outer inclined surface of the first slip sleeve 54 may be in contact with the inner inclined surface of the first slip 51 and apply a radial pressure to the first slip 51, enabling the first slip 51 to radially expand outward, thereby achieving setting and hanging.

[0047] In this embodiment, the second slip mechanism 6 may further include a support sleeve 62, a second slip sleeve 63, a second shear pin 64 and a third shear pin 65. The second slip sleeve 63 may be disposed at the upper end of the second slip 61 and connected to the central tube 1 through the second shear pin 64. The upper end of the support sleeve 62 may be in contact with the lower end of the second slip sleeve 63, and the lower end of the support sleeve 62 may be connected to the locking sleeve 42 through the third shear pin 65. The second slip sleeve 63 may be pushed upward by the upward thrust applied by the locking sleeve 42 through the support sleeve 62 to shear the second shear pin 64 and move upward, compressing the rubber barrel assembly 71 to make it expand and set. Here, the support sleeve 62 may have the function of supporting and transmitting axial force, and at the same time, it can prevent solids (such as sediment particles, etc.) in the drilling fluid in the wellbore from entering the gap between the second slip 61 and the central tube 1, avoiding the second slip 61 from being blocked during movement.

[0048] Specifically, the second shear pin 64 can be used to temporarily fix and connect the second slip sleeve 63 and the central tube 1. When the axial thrust received by the second slip sleeve 63 exceeds a certain critical value, the second shear pin 64 can be sheared off, thereby releasing the constraint between the second slip sleeve 63 and the central tube 1. The first slip sleeve 54 can be pushed upward, thereby compressing the rubber barrel assembly 71, and the rubber barrel assembly 71 can expand radially to be set in place.

[0049] The third shear pin 65 can be used to temporarily fix and connect the support sleeve 62 and the locking sleeve 42. When the axial thrust received by the locking sleeve 42 does not exceed the critical value, the third shear pin 65 will not be sheared off. At this time, the support sleeve 62, the locking sleeve 42, and the second slip sleeve 63 can be pushed upward as a whole, thereby compressing the rubber barrel assembly 71 to achieve setting in place; when the axial thrust received by the locking sleeve 42 exceeds the critical value, the third shear pin 65 can be sheared off, thereby releasing the constraint between the support sleeve 62 and the locking sleeve 42. The locking sleeve 42 can be pushed upward along the outer wall of the support sleeve 62, and then the second slip 61 can be pushed upward, so that the second slip 61 is sleeved on the outer wall of the second slip sleeve 63 and expands radially to be set and hung.

[0050] An outer inclined surface is formed on the outer wall at the lower end of the second slip sleeve 63, and an inner inclined surface is formed on the inner wall at the upper end of the second slip 61. When the second slip sleeve 63 and the second slip 61 move towards each other, the outer inclined surface of the second slip sleeve 63 can be in contact with the inner inclined surface of the second slip 61 and apply a radial pressure to the second slip 61, which can cause the second slip 61 to expand radially outward, thereby achieving setting and hanging.

[0051] In actual setting operations, the critical shear force values of the first shear pin 55, the second shear pin 64, the third shear pin 65, and the starting shear pin 10 can be set as follows, and the first slip 51 and the second slip 61 can be set and hung in different orders:

[0052] 1) Critical shear force value: The first shear pin 55 > the third shear pin 65 > the second shear pin 64 ≥ the starting shear pin 10.

[0053] After setting according to the above critical shear force values, during setting, after the piston 31 receives a thrust, it can first shear off the second shear pin 64 and the starting shear pin 10. The piston 31 can push the support sleeve 62, the locking sleeve 42, and the second slip sleeve 63 upward as a whole, and can first compress the rubber barrel assembly 71 to achieve setting in place; after the rubber barrel assembly 71 is set in place, continue to increase the thrust of the piston 31, and the third shear pin 65 can be sheared off. The locking sleeve 42 can lose its constraint and move upward along the support sleeve 62, and push the second slip 61 to open and set and hang; after the second slip 61 is set and hung, continue to increase the thrust of the piston 31, and the first shear pin 55 can be sheared off finally, causing the first slip sleeve 54 to move upward and finally opening and setting and hanging the first slip 51, and finally completing the setting operation of the entire packer.

[0054] 2) Shearing force critical values: The third shear pin 65 > the first shear pin 55 > the second shear pin 64 ≥ the starting shear pin 10.

[0055] After setting according to the above shearing force critical values, during setting, when the piston 31 receives a thrust, it can first cut off the second shear pin 64 and the starting shear pin 10. The piston 31 can push the support sleeve 62, the locking sleeve 42 and the second slip sleeve 63 to move upward as a whole, and can first compress the rubber barrel assembly 71 to achieve setting; after the rubber barrel assembly 71 is set, by continuously increasing the thrust of the piston 31, the first shear pin 55 can be cut off, enabling the first slip sleeve 54 to move upward and expand the first slip 51 to hang; after the first slip 51 is hung, by continuously increasing the thrust of the piston 31, the third shear pin 65 can be finally cut off, the locking sleeve 42 can lose its restraint and move upward along the support sleeve 62, and finally push the second slip 61 to expand and hang, ultimately completing the setting operation of the entire packer.

[0056] It should be noted that regardless of which hanging sequence is selected between the first slip 51 and the second slip 61, the rubber barrel assembly must be set first, and then the slips are hung, so as to ensure sufficient setting performance of the rubber barrel and avoid the problem of insufficient setting caused by the rubber barrel being unable to fully expand.

[0057] In this embodiment, the rubber barrel mechanism 7 further includes two groups of support components 72 symmetrically installed at the upper and lower ends of the rubber barrel assembly 71. One of the two groups of support components 72 may include a first support ring 721, a support spring 722, a second support ring 723 and an auxiliary support member 724 connected to the upper end of the rubber barrel assembly 71 in sequence from top to bottom. The other group of the two groups of support components 72 also includes a first support ring 721, a support spring 722, a second support ring 723 and an auxiliary support member 724 connected to the lower end of the rubber barrel assembly 71 in sequence from bottom to top; the support components 72 can be used to support and protect the rubber barrel assembly 71; here, the first support ring 721 can be a metal support ring, the second support ring 723 can be a PTFE support ring, and the auxiliary support member 724 can be a compressed metal wire mesh auxiliary support member; however, the present invention is not limited thereto, and the specific materials and types of the first support ring 721, the second support ring 723 and the auxiliary support member 724 can also be arbitrarily selected according to requirements, and the present invention does not make specific limitations thereto.

[0058] In this embodiment, the rubber barrel assembly 71 may include a main rubber barrel 711 and two end rubber barrels 712, and the two end rubber barrels 712 may be respectively arranged at the upper and lower ends of the main rubber barrel 711; here, the main rubber barrel 711 and the end rubber barrels 712 can be selected to be of the same or different materials according to actual operation requirements, and the present invention does not make specific limitations thereto.

[0059] Exemplary Embodiment 2

[0060] This exemplary embodiment provides a packer setting method.

[0061] The packer setting method of this exemplary embodiment can adopt a completion packer with an adjustable slip starting sequence as in Exemplary Embodiment 1.

[0062] As Figures 1 to 4 shown, the packer setting method of this exemplary embodiment may include the following:

[0063] 1. Setting method one:

[0064] Set the shear force critical values of each shear pin in the packer as: First shear pin 55 > Third shear pin 65 > Second shear pin 64 ≥ Starting shear pin 10.

[0065] After setting according to the above shear force critical values, during setting, drill fluid is input into the central pipe 1 and the lower mandrel 2 and pressured. The drill fluid acts on the lower end of the piston 31 through the pressure transmission hole 21. After the piston 31 receives the thrust, it applies the thrust to the first pressure transmission sleeve 32, the second pressure transmission sleeve 33, the locking sleeve 42, and the second slip sleeve 63. First, the second shear pin 64 and the starting shear pin 10 can be cut off. The piston 31 can push the support sleeve 62, the locking sleeve 42, and the second slip sleeve 63 to move upward as a whole, and first compress the rubber barrel assembly 71 to achieve setting; after the rubber barrel assembly 71 is set, continue to increase the thrust of the piston 31, and then the third shear pin 65 can be cut off. The locking sleeve 42 can lose its restraint and move upward along the support sleeve 62, and push the second slip 61 to open and hang; after the second slip 61 is hung, continue to increase the thrust of the piston 31, and finally the first shear pin 55 can be cut off, so that the first slip sleeve 54 moves upward, and finally the first slip 51 is opened and hung, and finally the overall setting operation of the packer is completed.

[0066] 2. Setting method two:

[0067] Set the shear force critical values of each shear pin in the packer as: Third shear pin 65 > First shear pin 55 > Second shear pin 64 ≥ Starting shear pin 10.

[0068] After setting according to the above shear force critical value, during setting, drilling fluid is input into the central pipe 1 and the lower mandrel 2 and pressure is built up. The drilling fluid acts on the lower end of the piston 31 through the pressure transmission hole 21. After the piston 31 receives the thrust, it applies the thrust to the first pressure transmission sleeve 32, the second pressure transmission sleeve 33, the locking sleeve 42 and the second slip sleeve 63. The second shear pin 64 and the starting shear pin 10 can be cut off first. The piston 31 can push the support sleeve 62, the locking sleeve 42 and the second slip sleeve 63 to move upward as a whole. The rubber barrel assembly 71 can be compressed first to realize setting; after the rubber barrel assembly 71 is set, the thrust of the piston 31 is continuously increased, and the first shear pin 55 can be cut off again, so that the first slip sleeve 54 moves upward to open the first slip 51 for hanging; after the first slip 51 is hung, the thrust of the piston 31 is continuously increased, and the third shear pin 65 can be cut off finally. The locking sleeve 42 can lose its restraint and move upward along the support sleeve 62, and finally push the second slip 61 to open for hanging, and finally complete the setting operation of the whole packer.

[0069] The packer setting method described in this exemplary embodiment can arbitrarily select one of the above two setting methods according to actual operation requirements to realize adjustable setting sequence of the packer slips.

[0070] Exemplary Embodiment 3

[0071] This exemplary embodiment provides a pressure test tooling for a packer.

[0072] The pressure test tooling for the packer described in this exemplary embodiment can be used for pressure test operation on the completion packer with adjustable slip starting sequence in Exemplary Embodiment 1.

[0073] Before the completion packer enters the well for operation, it needs to be subjected to a body pressure seal test on the ground first, which is verified by applying hydraulic pressure at the center of the packer. However, when the center of the completion packer bears pressure, it will cause the packer to start setting. Therefore, a pressure test tooling that can limit the packer from starting needs to be designed.

[0074] As Figures 1 to 4 shown, the pressure test tooling 8 for the packer described in this exemplary embodiment may include a locking block 81, a first outer cylinder 82, a second outer cylinder 83 and a third outer cylinder 84. The first outer cylinder 82, the second outer cylinder 83 and the third outer cylinder 84 can be fixedly connected in sequence from top to bottom through screw threads. The first outer cylinder 82 and the second outer cylinder 83 can be sleeved outside the setting driving mechanism 3, and the third outer cylinder 84 can be sleeved and fixedly connected to the lower end of the packer. Specifically, the third outer cylinder 84 can be fixedly sleeved outside the lower sub 9; the locking block 81 can be fixedly installed between the outer wall of the setting driving mechanism 3 and the inner wall of the first outer cylinder 82. Specifically, the locking block 81 can be fixedly installed between the outer wall of the second pressure transmission sleeve 33 and the inner wall of the first outer cylinder 82. When pressure is built up in the central pipe 1 for pressure test operation, the pressure test tooling 8 can prevent the setting driving mechanism 3 from moving upward and avoid premature setting of the packer.

[0075] In summary, for the well completion packer with adjustable slip starting sequence of the present invention, three shear pins are respectively provided between the first slip mechanism, the second slip mechanism, and between the second slip mechanism and the locking sleeve. By respectively setting the shear values of the three shear pins, the starting sequence of the first and second slips can be switched, and the first and second slips can be set after the rubber barrel is fully expanded and set; the existing hydraulic outer cylinder and the lower joint are designed into an integrated lower joint structure. Compared with the original lower joint structure, the sealing link between the original hydraulic outer cylinder and the lower joint is cancelled, and the number of potential seal leakage points is reduced; the anti-back-off mechanism includes an inner locking ring and a cylindrical helical spring. The inner locking ring has a threaded structure with inner locking teeth inclined downward at 45°, and the corresponding central tube has a threaded structure with outer locking teeth inclined upward at 45°. During the setting process, the cylindrical helical spring continuously provides a driving force to the inner locking ring, which can ensure that the sliding stroke of the inner locking ring along the central tube is consistent with the movement stroke of the piston, and can stably lock the stroke without back-off, ensuring a stable setting force is applied to the rubber barrel.

[0076] Although the present invention has been described above in conjunction with exemplary embodiments and the accompanying drawings, those of ordinary skill in the art should understand that various modifications can be made to the above embodiments without departing from the spirit and scope of the claims.

Claims

1. A completion packer with an adjustable slip start sequence, characterized in that, The packer includes a central pipe, a lower mandrel, a setting driving mechanism, a first slip mechanism, a second slip mechanism and a rubber barrel mechanism. Among them, the lower mandrel is fixedly connected to the lower end of the central pipe. The setting driving mechanism is sleeved on the lower mandrel and the central pipe. The first slip mechanism, the rubber barrel mechanism and the second slip mechanism are sleeved on the central pipe in sequence from top to bottom and are located above the setting driving mechanism; the first slip mechanism includes a first slip, the second slip mechanism includes a second slip, and the rubber barrel mechanism includes a rubber barrel assembly. The first slip, the rubber barrel assembly and the second slip are all sleeved on the central pipe. A pressure transmission hole penetrating radially is provided on the side wall of the lower mandrel. The drilling fluid pressure in the lower mandrel can be applied to the lower end of the setting driving mechanism through the pressure transmission hole. The setting driving mechanism can move upward under the drilling fluid pressure and push the rubber barrel assembly to expand radially for setting, and then push the first slip and the second slip to open radially in a set order for hanging.

2. The completion packer with adjustable slips starting sequence according to claim 1, characterized in that, The setting driving mechanism includes a piston, a first pressure transmission sleeve and a second pressure transmission sleeve. The piston is sleeved on the lower mandrel. The first pressure transmission sleeve is sleeved on the upper end of the piston and the lower mandrel. The second pressure transmission sleeve is sleeved on the central pipe and penetrates through the upper end of the first pressure transmission sleeve. The piston can be driven by the drilling fluid pressure passing through the pressure transmission hole and push the first pressure transmission sleeve and the second pressure transmission sleeve to move upward together to drive the first slip, the second slip and the rubber barrel assembly to set.

3. The completion packer with an adjustable slip starting sequence according to claim 2, wherein, The packer further includes a lower sub and a starting shear pin. The lower sub is sleeved on the lower end of the lower mandrel and the piston. The lower sub is connected to the piston through the starting shear pin. The piston can cut off the starting shear pin and move upward after being subjected to the drilling fluid pressure.

4. The completion packer with adjustable slips starting sequence according to claim 1, characterized in that, The packer further includes a locking mechanism. The locking mechanism includes an inner locking ring, a locking sleeve, a spacer ring and an elastic member sleeved on the central pipe. The lower end of the locking sleeve is sleeved and fixedly connected to the upper end of the setting driving mechanism. The upper end of the locking sleeve is connected to the second slip mechanism. The inner locking ring, the spacer ring and the elastic member are connected and penetrated through the locking sleeve in sequence from top to bottom. The upper end of the inner locking ring abuts against the inner wall of the locking sleeve. The lower end of the elastic member abuts against the upper end of the setting driving mechanism. The locking mechanism can be pushed upward by the setting driving mechanism to drive the first slip, the second slip and the rubber barrel assembly to set. Inner locking teeth are provided on the inner wall of the inner locking ring, and outer locking teeth are provided on the outer wall of the central pipe. The cooperation of the inner locking teeth and the outer locking teeth can prevent the locking mechanism from moving downward.

5. The completion packer with adjustable slips starting sequence according to claim 1, characterized in that, The first slip mechanism further includes a slip seat, a torque key, a first slip sliding sleeve and a first shear pin. The slip seat and the torque key are both fixedly connected to the upper end of the first slip. The torque key is sleeved and fixedly connected to the lower end of the slip seat. The first slip sliding sleeve is arranged at the lower end of the first slip and is connected to the central pipe through the first shear pin. The first slip sliding sleeve can be pushed upward to cut off the first shear pin and move upward, sleeving the first slip on the outer wall of the first slip sliding sleeve to make the first slip open radially for hanging.

6. The completion packer with adjustable slips starting sequence according to claim 4, characterized in that, The second slip mechanism further includes a support sleeve, a second slip sliding sleeve, a second shear pin, and a third shear pin. The second slip sliding sleeve is arranged at the upper end of the second slip and is connected to the central tube through the second shear pin. The upper end of the support sleeve abuts against the lower end of the second slip sliding sleeve, and the lower end of the support sleeve is connected to the locking sleeve through the third shear pin. The second slip sliding sleeve can be sheared by the upward thrust applied by the locking sleeve through the support sleeve and move upward, compressing the rubber barrel assembly to expand and set it. The locking sleeve can shear the third shear pin after being subjected to a thrust, and push the second slip to move upward relative to the second slip sliding sleeve, so that the second slip is sleeved on the outer wall of the second slip sliding sleeve and expands radially to be seated and hung.

7. The completion packer with adjustable slips starting sequence according to claim 1, characterized in that, The rubber barrel mechanism further includes two groups of support components symmetrically installed at the upper and lower ends of the rubber barrel assembly. One group of the two groups of support components includes a first support ring, a support spring, a second support ring, and an auxiliary support member sequentially connected from top to bottom at the upper end of the rubber barrel assembly. The other group of the two groups of support components includes a first support ring, a support spring, a second support ring, and an auxiliary support member sequentially connected from bottom to top at the lower end of the rubber barrel assembly. The support components are used to support and protect the rubber barrel assembly.

8. The completion packer with adjustable slips starting sequence according to claim 1, characterized in that, The rubber barrel assembly includes a main rubber barrel and two end rubber barrels, and the two end rubber barrels are respectively arranged at the upper and lower ends of the main rubber barrel.

9. A method for isolating a packer, characterized in that, The packer setting method uses a completion packer with adjustable slip starting sequence as described in any one of claims 1 to 8. The packer setting method includes applying pressure in the central tube to push the setting driving mechanism upward. The second slip mechanism first squeezes the rubber barrel assembly to expand and set it, then pushes the first slip to open and be seated and hung, and finally pushes the second slip to open and be seated and hung; or the second slip mechanism first squeezes the rubber barrel assembly to expand and set it, then pushes the second slip to open and be seated and hung, and finally pushes the first slip to open and be seated and hung.

10. A pressure testing tooling for a packer, characterized in that, The pressure test tooling is used for pressure testing the completion packer with adjustable slip starting sequence as described in any one of claims 1 to 8. The pressure test tooling includes a locking block, a first outer cylinder, a second outer cylinder, and a third outer cylinder. The first outer cylinder, the second outer cylinder, and the third outer cylinder are fixedly connected in sequence from top to bottom. The first outer cylinder and the second outer cylinder can be sleeved outside the setting driving mechanism, and the third outer cylinder can be sleeved and fixedly connected to the lower end of the packer. The locking block can be fixedly installed between the outer wall of the setting driving mechanism and the inner wall of the first outer cylinder to prevent the setting driving mechanism from moving upward to set the packer when applying pressure in the central tube.

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