Hydraulic drilling liner hanger with adjustable slip outer diameter

Abstract

The utility model relates to a hydraulic drilling liner hanger with an adjustable slip outer diameter. A slip shaft sleeve seat in the hanger and a slip supporting sleeve provided with a slip and a slip limiting bolt are arranged outside a central pipe; a slip telescopic track corresponding to the slip and more than two rows of slip limiting pin holes corresponding to the slip limiting bolts are arranged in the slip shaft sleeve seat, and slip limiting pins are mounted in the slip limiting pin holes; the upper part of the central pipe provided with a pressure transmission hole is connected with the upper joint; the rubber sleeve is arranged between the upper joint and the slip shaft sleeve seat; the lower portion of the slip supporting sleeve is sequentially connected with a piston and a hydraulic cylinder which are installed outside the center pipe, and the slip and the slip limiting bolt can move up and down in the slip shaft sleeve base. The problem that the opening outer diameter of the slip cannot be adjusted is solved, the opening outer diameter of the slip can be controlled by the slip limiting pin, a plurality of gears can be arranged, the slip can be hung in casing pipes with different inner diameters, and the purpose of being applied to casing pipes with different inner diameters in a well is achieved.

Description

Technical Field

[0001] The utility model belongs to a well completion tool in the petroleum industry, in particular to a hydraulic tail pipe hanger with adjustable slip outer diameter. Background Art

[0002] Liner hanging completion technology is mainly used in the field of oil well completion. Liner cementing is to cement only the open hole section of the casing in a well where the casing has been lowered. The casing string that does not extend to the wellhead is called the liner.

[0003] Liner hanger completion technology involves suspending the liner via a liner hanger. Suitable for deep, ultra-deep, and sidetracked wells, it effectively reduces the pressure on the drilling rig and lowers circulating pump pressure. Furthermore, the use of a liner hanger can further simplify drilling operations, shorten drilling cycles, reduce costs, and ensure operational safety. The core tool, the liner hanger, primarily suspends the liner on the upper casing string, reducing the flow resistance of the displacement cement slurry and improving the quality of cementing the outer annulus of the casing, laying a solid foundation for future operations.

[0004] Liner hanger completion technology is a low-cost, high-tech, high-risk completion technology that requires high safety and quality. To improve the well completion process using liner hangers, engineers have made many improvements to the liner hanger.

[0005] At present, the following related patent technologies have appeared: Chinese patent application No. 201720877749.3 discloses a hydraulic tail pipe hanger, including an upper joint, a lower joint, a cover ring, a clamping platform, a rubber layer, an expansion casing, an expansion chamber, a depth sensor, a liquid hole, a liquid chamber, a slider, a sealing block, an oblique connecting surface, a rubber seat clamping block, a rubber seat, a rubber plug, an expansion head, a slip, a conical surface, an inner ring tube, a connecting rod, a pin and a hanger body. An upper joint is provided on the left side of the hanger body, and a rubber layer is provided on the outside of the hanger body. A clamping platform is provided on the outside of the rubber layer near the left side, and a conical surface is provided on the right side of the clamping platform. An expansion chamber is provided on the inner side of the expansion casing, and an inner ring tube is installed on the inner side of the expansion chamber. The utility model has a simple structure, is easy to operate, stable and reliable, and is provided with a depth sensor, which can send the sensed depth information to the receiving device by wireless signal, and can accurately locate. A slider is provided at the bottom of the inner ring tube, and a sealing block is provided on the slider to ensure the tightness of the liquid chamber.

[0006] However, the components in the above inventions are difficult to manufacture and have high manufacturing costs.

[0007] Chinese patent application No. 201711254018.4 discloses a single-ball hydraulic tail pipe hanger, which includes an outer sleeve, at least two sitting mechanisms and a sealing mechanism arranged on the outer wall of the outer sleeve, a plurality of hydraulic transmission mechanisms respectively arranged below each sitting mechanism and above and below the sealing mechanism, and a first ball-dropping and pressure-holding mechanism and a second ball-dropping and pressure-holding mechanism arranged on the inner side of the outer sleeve; a plurality of pressure transmission hole groups respectively connected to the inner cavity of the hydraulic cylinder of each hydraulic transmission mechanism are opened on the side wall of the outer sleeve, so that the sitting mechanism and the sealing mechanism can be sat or sealed on the well wall under the action of hydraulic pressure; the first ball-dropping and pressure-holding mechanism is arranged on the inner wall of the outer sleeve between the sitting mechanism and the sealing mechanism, and the second ball-dropping and pressure-holding mechanism is arranged on the inner wall of the outer sleeve below the sealing mechanism; the device can respectively use the two ball-dropping and pressure-holding mechanisms to avoid the occurrence of problems such as untimely sitting and sealing or inappropriate timing, effectively improve the sitting effect and ensure the success rate of sitting and effective sealing.

[0008] However, the above inventions have complex structures and are prone to safety failures in harsh working environments underground.

[0009] Research into current domestic and international research reveals that hydraulic liner hangers are currently the most widely used and stable liner hanger completion tool. However, most hangers have fixed slip opening diameters, suitable only for fixed casing inner diameters. Addressing the issue of non-adjustable slip opening diameters in hydraulic liner hangers warrants improvement and development. Summary of the Invention

[0010] The purpose of the utility model is to provide a hydraulic liner hanger with adjustable slip outer diameter, which solves the problem that the slip outer diameter of the existing hydraulic liner hanger cannot be adjusted, so that the liner hanger can be used for casings of different sizes in the well, reduces the manufacturing cost of the liner hanger, facilitates the liner hanging completion construction, improves construction efficiency, and reduces production costs.

[0011] The technical solution of the utility model is: a hydraulic tail pipe hanger with adjustable outer diameter of slips, provided with a rubber cylinder, slips and a center tube, wherein: a slip sleeve seat and a slip support sleeve equipped with slips and slip limit bolts are installed outside the center tube; a slip telescopic rail corresponding to the slips and two or more rows of slip limit pin holes corresponding to the slip limit bolts are provided in the slip sleeve seat, and slip limit pins are installed in the slip limit pin holes; the upper part of the center tube provided with a pressure transmission hole is connected to the upper joint, and the rubber cylinder is installed between the upper joint and the slip sleeve seat; the lower part of the slip support sleeve is connected to the piston and the hydraulic cylinder installed outside the center tube in sequence, and the slips and the slip limit bolts can move up and down in the slip sleeve seat.

[0012] Preferably, the upper tube wall of the slip sleeve seat is provided with an annular cavity, the lower tube wall is provided with a slip telescopic rail and a slip limit bolt through hole, and the slip limit pin hole and slip limit pin are provided in the annular cavity of the upper tube wall of the slip sleeve seat.

[0013] Preferably, the slip telescopic rails in the lower tube wall of the slip sleeve seat and the slip limiting pins in the upper tube wall are arranged alternately.

[0014] Preferably, the annular cavity gap in the upper tube wall of the cava sleeve seat is larger than the outer diameter of the cava limit bolt; the cava telescopic track is a downward inclined axial track, and the upper slope surface of the inner body of the upper part of the cava matches the lower slope surface of the cava telescopic track.

[0015] Preferably, the spacing distance between the slip limit pin holes in each row in the axial direction of the slip sleeve seat is determined according to the lower slope surface of the slip telescopic track.

[0016] Preferably, a connecting groove corresponding to the lower body structure of the cava is provided in the upper body of the cava support sleeve, and a cava limiting bolt connecting hole is provided in the upper body of the cava support sleeve between the connecting grooves, and a cava limiting bolt is installed in the cava limiting bolt connecting hole.

[0017] Preferably, a piston assembly groove is provided in the lower inner cavity of the slip support sleeve, and the lower inner hole of the slip support sleeve formed by the piston assembly groove is larger than the upper inner hole.

[0018] Preferably, the outer circle of the center tube is a non-uniform diameter outer circle, both ends of the center tube are provided with external threads and can be connected to the upper joint and the tail pipe column respectively, and the outer circle of the center tube is provided with a cava sleeve seat assembly step, a pressure transmission hole separation step and a hydraulic cylinder adaptation step from top to bottom; the pressure transmission holes in the center tube are provided with two rows and are respectively arranged in the tube body corresponding to the inner cavity of the piston and the inner cavity of the hydraulic cylinder, and the number of pressure transmission holes in each row is set to more than two.

[0019] Preferably, the piston is threadedly connected to the hydraulic cylinder, the upper body of the piston is suspended in the piston assembly groove in the slip support sleeve and the lower body is threadedly connected to the hydraulic cylinder; the hydraulic cylinder and the center pipe are connected by shear nails.

[0020] Preferably, protective bowls are provided at both ends of the rubber cylinder, and spacer rings are provided between the rubber cylinders; the upper inner cavity of the upper joint is threadedly connected to the casing column of the upper layer.

[0021] Compared with the existing hydraulic liner hanger, the significant use effect of the utility model is that it solves the problem that the outer diameter of the slips of the existing hydraulic liner hanger cannot be adjusted. The outer diameter of the slips can be controlled by the slip limit pins, and multiple gears can be set. It can be hung in casings with different inner diameters, achieving the purpose of being applicable to casings with different inner diameters in the well.

[0022] Since the invention can be applied to casings with different inner diameters, it is unnecessary to manufacture hydraulic liner hangers of various sizes, thereby reducing the manufacturing cost of the hydraulic liner hanger.

[0023] During the liner completion construction, there is no need to consider the application size of the hydraulic liner hanger, which facilitates the liner completion construction, improves the construction efficiency and reduces the production cost.

[0024] 4. The utility model provides a hanger with adjustable outer diameter for liner completion, which has a simple structure, convenient operation, low cost, wide applicability and is easy to manufacture on a large scale.

[0025] In summary, the invention has significant use effect and can produce good economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 It is the overall structure diagram of the utility model.

[0028] Figure 2 yes Figure 1 Schematic diagram of the appearance structure.

[0029] Figure 3 yes Figure 1 Schematic diagram of the assembly structure of the middle slip sleeve seat and slip support sleeve.

[0030] In the figure: upper joint 1, rubber cylinder 2, spacer ring 3, protective bowl 4, slip sleeve seat 5, slip limit pin 6, slip 7, slip limit bolt 8, slip support sleeve 9, piston 10, pressure transmission hole 11, hydraulic cylinder 12, center tube 13. DETAILED DESCRIPTION

[0031] The accompanying drawings are for reference and illustration purposes only and are not intended to limit the scope of protection of the present invention. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] In the description of the present invention, it should be understood that the terms "length," "width," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," and the like, indicating positions or location relationships, are based on the positions or location relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, in the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

[0034] See also Figure 1 - Figure 3 A hydraulic tail pipe hanger with adjustable slip outer diameter is provided with a rubber cylinder 2, slips 7 and a center tube 13, wherein: the slip sleeve seat 5 and the slip support sleeve 9 equipped with slips 7 and slip limit bolts 8 are installed on the outside of the center tube 13; the slip sleeve seat 5 is provided with a slip telescopic rail corresponding to the slip 7 and two or more rows of slip limit pin holes corresponding to the slip limit bolts 8, and the slip limit pins 6 are installed in the slip limit pin holes; the upper part of the center tube 13 provided with a pressure transmission hole 11 is connected to the upper joint 1, and the rubber cylinder 2 is installed between the upper joint 1 and the slip sleeve seat 5; the lower part of the slip support sleeve 9 is connected to the piston 10 and the hydraulic cylinder 12 installed on the outside of the center tube 13 in sequence, and the slips 7 and the slip limit bolts 8 can move up and down in the slip sleeve seat 5.

[0035] In the present invention, the body of the slip sleeve 5 is provided with a slip telescopic track that allows the slips 7 to be moved and extended, and one or more rows of slip stop pin holes for receiving slip stop pins 6. By changing the installation position of the slip stop pins 6, the supporting outer diameter of the slips 7 and the compressed outer diameter of the rubber sleeve 2 can be changed to accommodate use in casings with different inner diameters.

[0036] The central tube 13 of the present invention is provided with a pressure transmission hole 11, through which a pressure fluid can be pumped. The pressure of the pressure fluid pushes the hydraulic cylinder 12 and piston 10 mounted on the outside of the central tube 13 upward. When the piston 10 moves upward, it pushes the slip support sleeve 9, the slips 7 mounted therein, and the slip stop bolt 8 upward within the slip sleeve seat 5. The slips 7 move upward and extend outward along the slip telescopic track in the slip sleeve seat 5. The slip stop bolt 8 moves upward in response to the slip stop pin 6 in the slip stop pin hole, stopping when it encounters resistance.

[0037] At this time, the slip 7 is supported in the casing according to the required inner diameter of the casing. At the same time, since the rubber cylinder 2 is installed between the upper joint 1 and the slip sleeve seat 5, the rubber cylinder 2 is squeezed by the upward-moving slip sleeve seat 5 and the slip support sleeve 9 to expand outward, sealing the annulus between the casing and the utility model.

[0038] Through the above technical solutions, the utility model solves the problem that the outer diameter of the slips of the existing hydraulic liner hanger cannot be adjusted, so that the tool can be used for casings of different sizes in the well, reducing the manufacturing cost of the liner hanger and facilitating the liner Well Completion Construction, improves construction efficiency and reduces production costs.

[0039] Based on the above-mentioned embodiment one, the utility model also has the following embodiments: A preferred embodiment: an annular cavity is set on the upper tube wall of the cava sleeve seat 5, and a cava telescopic rail and a cava limiting bolt through hole are set on the lower tube wall, and the cava limiting pin hole and the cava limiting pin 6 are set in the annular cavity of the upper tube wall of the cava sleeve seat 5.

[0040] A preferred embodiment: the slip telescopic rails in the lower tube wall of the slip sleeve seat 5 and the slip limiting pins 6 in the upper tube wall are arranged alternately.

[0041] In a preferred embodiment, the annular cavity clearance in the upper tube wall of the slip sleeve seat 5 is larger than the outer diameter of the slip stop bolt 8; the slip telescopic track is a downwardly inclined axial track, and the upper slope of the inner body of the upper portion of the slip 7 matches the lower slope of the slip telescopic track. Driven by the piston 10, the slip 7 can move smoothly up and down within the slip sleeve seat 5.

[0042] A preferred embodiment: The axial spacing between the slip limit pin holes in each row on the slip sleeve seat 5 is determined based on the lower slope of the slip telescopic track. The spacing between the slip limit pin holes in each row can be adjusted based on the lower slope of the slip telescopic track to accommodate standard casings with different inner diameters. If the angle of the lower slope of the slip telescopic track is large, the slips 7 move upward a short distance and can be quickly extended from the slip sleeve seat 5, and the axial spacing between the slip limit pin holes in each row will be small. If the angle of the lower slope of the slip telescopic track is small, the slips 7 move upward a long distance and the axial spacing between the slip limit pin holes in each row will be large.

[0043] The slip sleeve seat 5 shown in the figure has three rows of limit pin holes, i.e., three adjustment levels, allowing this tool to accommodate three different casing inner diameters. Of course, the number of rows of limit pin holes, i.e., the adjustment levels, can be increased or decreased as needed. The slip limit pins 6 can be installed in the limit pin holes at different levels. By providing the limit pin holes in the slip sleeve seat 5 and installing the slip limit pins 6 therein, the travel distance of the slip limit bolts 8 is limited, thereby controlling the displacement level of the slips 7 and achieving compatibility with different casing inner diameters.

[0044] A preferred embodiment: a connecting groove corresponding to the lower body structure of the cava 7 is provided in the upper body of the cava support sleeve 9, and a cava limiting bolt connecting hole is provided in the upper body of the cava support sleeve 9 between the connecting grooves, and a cava limiting bolt 8 is installed in the cava limiting bolt connecting hole.

[0045] In a preferred embodiment, a piston assembly groove is provided in the lower inner cavity of the slip support sleeve 9. The lower inner hole of the slip support sleeve 9 formed by the piston assembly groove is larger than the upper inner hole, so that the piston 10 pushes the slip support sleeve 9 more powerfully and reliably.

[0046] A preferred embodiment: the outer circle of the center tube 13 is a non-uniform outer circle, and both ends of the center tube 13 are provided with external threads and can be connected to the upper joint 1 and the tail pipe string respectively. The outer circle of the center tube 13 is provided with a slip sleeve assembly step, a pressure transmission hole separation step, and a hydraulic cylinder adaptation step from top to bottom. The pressure transmission holes 11 in the center tube 13 are provided in two rows and are respectively arranged in the tube body corresponding to the inner cavity of the piston 10 and the inner cavity of the hydraulic cylinder 12. The number of pressure transmission holes 11 in each row is set to be two or more. The two rows of pressure transmission holes 11 are separated by the pressure transmission hole separation step on the outer circle of the center tube 13 and correspond to the inner cavity of the piston 10 and the inner cavity of the hydraulic cylinder 12 respectively. This can enhance the hydraulic pushing force and increase the clamping force of the slips 7 and the rubber cylinder 2 on the inner wall of the casing.

[0047] A preferred embodiment: the piston 10 is threadedly connected to the hydraulic cylinder 12, the upper body of the piston 10 is suspended in the piston assembly groove in the slip support sleeve 9 and the lower body is threadedly connected to the hydraulic cylinder 12; the hydraulic cylinder 12 and the center pipe 13 are connected by shear nails, which are not shown in the figure.

[0048] A preferred embodiment: protective bowls 4 are installed at both ends of the rubber cylinder 2, and spacer rings 3 are installed between the rubber cylinders 2; the upper inner cavity of the upper joint 1 is threadedly connected to the casing string of the upper layer.

[0049] The method of using the utility model is as follows: before the well completion work, the gear position of the slip limit pin 6 and the opening outer diameter of the slip 7 are determined according to the inner diameter of the upper layer of the casing string in the application well.

[0050] The utility model and the tail pipe string are lowered into the well to the designed depth by using a special running tool.

[0051] The sealing ball is dropped. When the sealing ball reaches the ball seat connected to the liner string, the pressure is built up. The hydraulic pressure is transmitted to the hydraulic cylinder 12 through the pressure transmission hole 11 in the central tube 13. The pressure pushes the piston 10 upward, shearing the shear pins between the hydraulic cylinder 12 and the central tube 13. The pressure then pushes the slip support sleeve 9 and drives the slips 7 upward. The slips 7 move upward along the lower slope of the slip telescopic track in the slip sleeve seat 5 and wedge into the annulus between the slip support sleeve 9 and the upper casing string. When the drilling tool is lowered, since the lower end of the central tube 13 is connected to the liner string, the weight of the liner string is supported by the tool in the upper casing.

[0052] Continue to pressurize and establish normal liquid circulation after the ball seat connected in the tail pipe string is blocked.

[0053] After the completion of the well construction, turn the construction string upside down to separate the running tool from this tool, and then pull out the running tool according to the normal operation process.

[0054] The embodiments described above are merely typical embodiments, but the present invention is not limited to these embodiments, and those skilled in the art can make modifications without departing from the spirit and enlightenment of the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the creative spirit and creative concept of the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection is not limited to the above description.

Claims

1. A hydraulic liner hanger with adjustable slip outer diameter, comprising a rubber sleeve, slips, and a center tube, characterized by: The slip sleeve seat and the slip support sleeve equipped with slips and slip limit bolts are installed outside the center tube; the slip sleeve seat is provided with a slip telescopic rail corresponding to the slip and more than two rows of slip limit pin holes corresponding to the slip limit bolts, and the slip limit pins are installed in the slip limit pin holes; the upper part of the center tube provided with a pressure transmission hole is connected to the upper joint, and the rubber cylinder is installed between the upper joint and the slip sleeve seat; the lower part of the slip support sleeve is connected to the piston and hydraulic cylinder installed outside the center tube in sequence, and the slip and the slip limit bolt can move up and down in the slip sleeve seat.

2. The hydraulic liner hanger with adjustable slip outer diameter according to claim 1, characterized in that: The upper tube wall of the slip sleeve seat is provided with an annular cavity, the lower tube wall is provided with a slip telescopic track and a slip limit bolt through hole, and the slip limit pin hole and the slip limit pin are provided in the annular cavity of the upper tube wall of the slip sleeve seat.

3. The hydraulic liner hanger with adjustable slip outer diameter according to claim 2, characterized in that: The slip telescopic rails in the lower tube wall of the slip sleeve seat and the slip limiting pins in the upper tube wall are arranged alternately.

4. The hydraulic liner hanger with adjustable slip outer diameter according to claim 3, wherein: The annular cavity gap in the upper tube wall of the slip sleeve seat is larger than the outer diameter of the slip limit bolt; the slip telescopic track is a downward inclined axial track, and the upper slope surface of the inner body of the upper part of the slip matches the lower slope surface of the slip telescopic track.

5. The hydraulic liner hanger with adjustable slip outer diameter according to claim 4, characterized in that: The spacing distance between the slip limit pin holes in each row in the axial direction of the slip sleeve seat is determined according to the lower slope surface of the slip telescopic track.

6. The hydraulic liner hanger with adjustable slip outer diameter according to claim 1, wherein: The upper body of the slip support sleeve is provided with a connecting groove corresponding to the lower body structure of the slip, and the upper body of the slip support sleeve is provided with a slip limiting bolt connecting hole between the connecting grooves, and the slip limiting bolt is installed in the slip limiting bolt connecting hole.

7. The hydraulic liner hanger with adjustable slip outer diameter according to claim 6, characterized in that: A piston assembly groove is provided in the lower inner cavity of the slip support sleeve, and the lower inner hole of the slip support sleeve formed by the piston assembly groove is larger than the upper inner hole.

8. The hydraulic liner hanger with adjustable slip outer diameter according to claim 7, characterized in that: The outer circle of the center tube is a non-uniform diameter outer circle. Both ends of the center tube are provided with external threads and can be connected to the upper joint and the tail pipe column respectively. The outer circle of the center tube is provided with a slip sleeve seat assembly step, a pressure transmission hole separation step and a hydraulic cylinder adaptation step from top to bottom; the pressure transmission holes in the center tube are provided with two rows and are respectively arranged in the tube body corresponding to the inner cavity of the piston and the inner cavity of the hydraulic cylinder, and the number of pressure transmission holes in each row is set to more than two.

9. The hydraulic liner hanger with adjustable slip outer diameter according to claim 8, characterized in that: The piston is threadedly connected to the hydraulic cylinder, the upper body of the piston is suspended in the piston assembly groove in the slip support sleeve and the lower body is threadedly connected to the hydraulic cylinder; the hydraulic cylinder and the center pipe are connected by shear nails.

10. The hydraulic liner hanger with adjustable slip outer diameter according to claim 8, wherein: Both ends of the rubber cylinder are equipped with protective bowls, and a spacer ring is installed between the rubber cylinders; the upper inner cavity of the upper joint is threadedly connected with the casing column of the upper layer.

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