Coiled tubing wellhead fracture capture device

Abstract

The application discloses a coiled tubing wellhead fracture capturing device, which comprises a cylindrical outer cylinder, a cylindrical inner cylinder arranged below the inner part of the outer cylinder, a base arranged below the inner part of the inner cylinder, four uniformly distributed slips arranged on the base, and four groups of connecting rod assemblies arranged in the inner part of the inner cylinder. When the coiled tubing is fractured, the connecting rod assemblies are actuated, the first connecting rod is lowered and pushes the slip to be lowered, the slip tightly holds the coiled tubing and is locked. In this way, the rollers and the slip are far away from each other, the influence of the delay of the trigger part on the control of the execution part can be avoided. Through the connecting rod transmission, the self-weight of the connecting rod assembly and the slip is fully utilized, the slip is rapidly actuated, the system does not need to be connected to electricity, and the safety explosion prevention of the wellhead construction is facilitated.

Description

Technical Field

[0001] This invention relates to an oil well equipment, and more specifically, to a coiled tubing wellhead fracture capture device. Background Technology

[0002] Currently, when coiled tubing equipment is used in oilfield operations, there are no effective measures or equipment to prevent it from falling into the well due to the clamping block of the injection head falling off or the failure to handle obstructions in time during the lowering of the coiled tubing.

[0003] Chinese patent CN111946290A discloses a coiled tubing anti-fall-off device. This design uses a steel wire rope, spring, and tie rod to drive the axial movement of the slips; it clamps the tubing after a breakage to prevent it from falling into the well. However, in this design, the slip end engages with the outer cylinder's conical surface, resulting in very limited radial clamping effect. Furthermore, the spring and steel wire mechanism requires the steel wire to drag the cross-shaped bushing upwards when the slips trigger the clamping motion, making the transmission process complex and causing excessive delay in slip activation. Therefore, this design requires the trigger end to be located far from the slips, resulting in an excessively long anti-fall-off device and increasing the difficulty of installation and use. Summary of the Invention

[0004] Therefore, it is necessary to provide a coiled tubing wellhead fracture capture device to address the aforementioned technical problems.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A coiled tubing wellhead fracture detection device is characterized in that it comprises a cylindrical outer cylinder, a cylindrical inner cylinder located at the lower part of the inner cylinder, an annular guide ring located at the upper part of the inner cylinder, and a coiled tubing located at the center of the outer cylinder, the coiled tubing passing through the guide ring.

[0007] The inner cylinder has a base at its lower interior. Four evenly distributed slips are mounted on the base. Each base has a T-shaped base groove, and each slip has a T-shaped slip protrusion that engages with the base groove. Slip teeth are located on the side of the slips facing the continuous tubing.

[0008] The inner cylinder has four limiters on its upper inner wall and four vertical grooves in the middle of its inner wall. Each of the two side walls of a vertical groove has a lug.

[0009] The inner cylinder is equipped with four sets of connecting rod assemblies, each comprising a first connecting rod, a second connecting rod, a third connecting rod, and a fourth connecting rod. The lower end of the first connecting rod is connected to the locking hinge, the upper end of the first connecting rod is connected to the outer end of the second connecting rod, the middle part of the second connecting rod is connected to the support lug hinge, the inner end of the second connecting rod is connected to the lower end of the third connecting rod, the upper end of the third connecting rod is connected to a roller hinge, the lower end of the fourth connecting rod is connected to the roller hinge, and the upper end of the fourth connecting rod is connected to the limiter hinge.

[0010] Each vertical groove is equipped with a spring, the lower end of which is fixedly connected to the bottom of the vertical groove, and the upper end of which is fixedly connected to the upper end of the first connecting rod.

[0011] In a preferred embodiment of the present invention, a conical opening is provided on the upper inner side of the guide ring.

[0012] In a preferred embodiment of the present invention, the upper part of the slip is provided with a groove, and a slidable slider and a coil spring are provided in the groove, the coil spring cooperating with the slider.

[0013] In a preferred embodiment of the present invention, the slider is cylindrical.

[0014] In a preferred embodiment of the present invention, the limiter includes two opposing limit plates arranged in a figure-7 shape, and a pin is installed at the lower end of the limit plates, the pin limiting the opening angle of the fourth link.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] This invention provides a coiled tubing wellhead fracture detection device. When the coiled tubing breaks, it falls past the rollers. Under the action of spring tension and the weight of the slips and connecting rod assembly, the first, second, third, and fourth connecting rods actuate. The first connecting rod moves downward, pushing the slips downward, and the slips grip and lock the coiled tubing. This arrangement, with a relatively large distance between the rollers and the slips, avoids the impact of delays in the triggering and actuating parts on control. Through connecting rod transmission, the device fully utilizes the weight of the connecting rod assembly and the slips, resulting in rapid slip response. The system requires no electrical connection, facilitating safe and explosion-proof wellhead construction. Attached Figure Description

[0017] To more clearly illustrate the solutions in this invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the longitudinal structure of the coiled tubing wellhead fracture capture device of the present invention;

[0019] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure of the coiled tubing wellhead fracture capture device along line AA.

[0020] Figure 3 for Figure 1 A partial structural diagram of the coiled tubing wellhead fracture capture device is shown, illustrating the fit between the slips and the base.

[0021] Figure 4 for Figure 3 A cross-sectional view of the capturing device along line BB in the image;

[0022] Figure 5 for Figure 1 An enlarged view of region C in the diagram;

[0023] The markings in the diagram are explained as follows:

[0024] 1. First connecting rod; 10. Spring; 11. Inner cylinder; 12. Outer cylinder; 13. Slip; 131. Slip protrusion; 132. Slip teeth; 133. Slide groove; 14. Base; 141. Base slide groove; 15. Slider; 16. Coil spring; 17. Limiter; 171. Limiting plate; 172. Pin; 2. Second connecting rod; 3. Third connecting rod; 4. Fourth connecting rod; 5. Guide ring; 51. Conical opening; 6. Coiled tubing; 7. Roller; 8. Support lug; 9. Vertical groove; S. Connecting rod assembly. Detailed Implementation

[0025] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0026] like Figures 1 to 5 As shown, the coiled tubing wellhead fracture capture device includes a cylindrical outer cylinder 12, a cylindrical inner cylinder 11 located at the lower part of the inner cylinder 12, an annular guide ring 5 located at the upper part of the inner cylinder 12, and a coiled tubing 6 located at the center of the outer cylinder 12, the coiled tubing 6 passing through the guide ring 5.

[0027] The inner cylinder 11 has a base 14 at its lower interior. The base 14 has four evenly distributed slips 13. Each base 14 has a "T"-shaped base groove 141. Each slip 13 has a "T"-shaped slip protrusion 131. The slip protrusion 131 cooperates with the base groove 141. The slip teeth 132 are provided on the side of the slip facing the continuous oil pipe 6.

[0028] The inner wall of the inner cylinder 11 is provided with four limiters 17 on the upper part of the inner wall, and four vertical grooves 9 are provided in the middle of the inner wall of the inner cylinder 11. Each of the two side walls of the vertical grooves 9 is provided with an ear 8.

[0029] The inner cylinder 11 is provided with four sets of connecting rod assemblies S. The connecting rod assembly S includes a first connecting rod 1, a second connecting rod 2, a third connecting rod 3 and a fourth connecting rod 4. The lower end of the first connecting rod 1 is hinged to the latch 13, the upper end of the first connecting rod 1 is hinged to the outer end of the second connecting rod 2, the middle part of the second connecting rod 2 is hinged to the lug 8, the inner end of the second connecting rod 2 is hinged to the lower end of the third connecting rod 3, the upper end of the third connecting rod 3 is hinged to a roller 7, the lower end of the fourth connecting rod 4 is hinged to the roller 7, and the upper end of the fourth connecting rod 4 is hinged to the limiter 17.

[0030] It should be noted that the roller 7 rests on the continuous oil pipe 6 and can roll on the continuous oil pipe 6, thus avoiding direct contact between the third link 3 and the fourth link 4 and the continuous oil pipe 6, which would cause wear.

[0031] Each vertical groove 9 is equipped with a spring 10. The lower end of the spring 10 is fixedly connected to the bottom of the vertical groove 9, and the upper end of the spring 10 is fixedly connected to the upper end of the first connecting rod 1.

[0032] It should be noted that the upper end of the spring 10 can also be connected in other ways. For example, the upper end of the spring 10 can be connected to the end of the first link 1 near the second link 2, or the upper end of the spring 10 can be connected to the end of the second link 2 near the first link 1.

[0033] A conical opening 51 is provided on the upper inner side of the guide ring 5.

[0034] The upper part of the slip 13 is provided with a groove 133, in which a sliding slider 15 and a coil spring 16 are provided. The coil spring 16 cooperates with the slider 15. The slider 15 is cylindrical, and the coil spring 16 is a coiled cylindrical shape.

[0035] The coil spring 16 allows the lower hinge point of the first connecting rod 1 to move relative to the slip 13. After the slip 13 grips the continuous tubing 6, the weight of the continuous tubing 6 drags the slip 13 further downward. The coil spring 16 can ensure that the connecting rod assembly S moves the slip 13 downward without generating relative movement.

[0036] like Figure 5 As shown, the limiter 17 includes two opposing limit plates 171 arranged in a "7" shape. A pin 172 is installed at the lower end of the limit plate, and the pin 172 limits the opening angle of the fourth link 4.

[0037] The working process of this coiled tubing wellhead fracture capture device is described below.

[0038] The coiled tubing 5 is inserted into the inner cylinder 11 via the guide ring 5. After the coiled tubing 6 contacts the roller 7, it opens the fourth link 4. Through the combined action of the fourth link 4, the third link 3, and the second link 2, the first link 1 is pulled upward, thereby driving the slip 13 upward. In this way, the slip 13 is in an open state, without compressing or clamping the coiled tubing 6.

[0039] When the coiled tubing 6 breaks, it falls through the roller 7. Under the tension of the spring 10 and the weight of the slip 13 and the connecting rod assembly S, the first connecting rod 1, the second connecting rod 2, the third connecting rod 3, and the fourth connecting rod 4 move. The first connecting rod 1 moves down and pushes the slip 13 down, which then grips and locks the coiled tubing 6.

[0040] In this way, the distance between roller 7 and slip 13 is relatively large, which can avoid the impact of the delay from the triggering part to the execution part on the control. Through linkage transmission, the self-weight of linkage assembly S and slip 13 is fully utilized, slip 13 responds quickly, the system does not require power connection, which is beneficial to the safety and explosion protection of wellhead construction.

[0041] Not limited to this, any variations or substitutions conceived without inventive effort should be included within the scope of protection of this invention. Therefore, the scope of protection of this invention should be determined by the scope defined in the claims.

Claims

1. A coiled tubing wellhead fracture detection device, characterized in that, The coiled tubing wellhead fracture capture device includes a cylindrical outer cylinder (12), a cylindrical inner cylinder (11) is provided at the lower part of the inner cylinder (12), an annular guide ring (5) is provided at the upper part of the inner cylinder (12), and a coiled tubing (6) is provided at the center of the outer cylinder (12), the coiled tubing (6) passing through the guide ring (5). The inner cylinder (11) has a base (14) at its lower interior. The base (14) has four evenly distributed slips (13). Each base (14) has a "T"-shaped base groove (141). Each slip (13) has a "T"-shaped slip protrusion (131). The slip protrusion (131) cooperates with the base groove (141). The slip teeth (132) are provided on the side of the slip (13) facing the continuous oil pipe (6). The inner wall of the inner cylinder (11) is provided with four limiters (17) on the upper part of the inner wall, and four vertical grooves (9) are provided in the middle of the inner wall of the inner cylinder (11). Each of the two side walls of the vertical grooves (9) is provided with an ear (8). The inner cylinder (11) is provided with four sets of connecting rod assemblies (S). The connecting rod assembly (S) includes a first connecting rod (1), a second connecting rod (2), a third connecting rod (3), and a fourth connecting rod (4). The lower end of the first connecting rod (1) is hinged to the latch (13), the upper end of the first connecting rod (1) is hinged to the outer end of the second connecting rod (2), the middle part of the second connecting rod (2) is hinged to the lug (8), the inner end of the second connecting rod (2) is hinged to the lower end of the third connecting rod (3), the upper end of the third connecting rod (3) is hinged to a roller (7), the lower end of the fourth connecting rod (4) is hinged to the roller (7), and the upper end of the fourth connecting rod (4) is hinged to the limiter (17). Each vertical groove (9) is provided with a spring (10), the lower end of the spring (10) is fixedly connected to the bottom of the vertical groove (9), and the upper end of the spring (10) is fixedly connected to the upper end of the first connecting rod (1).

2. The coiled tubing wellhead fracture capture device according to claim 1, characterized in that, A conical opening (51) is provided on the upper inner side of the guide ring (5).

3. The coiled tubing wellhead fracture capture device according to claim 1, characterized in that, The upper part of the clapper (13) is provided with a groove (133), and a sliding slider (15) and a coil spring (16) are provided in the groove (133). The coil spring (16) cooperates with the slider (15).

4. The coiled tubing wellhead fracture capture device according to claim 3, characterized in that, The slider (15) is cylindrical.

5. The coiled tubing wellhead fracture capture device according to claim 1, characterized in that, The limiter (17) includes two opposing limit plates (171) arranged in the shape of a "7". A pin (172) is installed at the lower end of the limit plate (171) and the pin (172) limits the opening angle of the fourth link (4).

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