Wellhead hydraulic plugging device

Abstract

The utility model provides a wellhead hydraulic plugging device, which belongs to the technical field of oil and gas exploitation and comprises a mounting seat, a driving component and a plugging component. A connecting flange is mounted at the bottom of the mounting seat; a sleeve is arranged at the bottom of the connecting flange; a multi-stage hydraulic cylinder is mounted at the top of a mounting seat, hydraulic oil is injected through an oil inlet to push the multi-stage hydraulic cylinder to stretch, the multi-stage hydraulic cylinder stretches to drive a push rod to stretch, so that an inner rod body is driven by the push rod to press downwards, and a guide head at the bottom end of the inner rod body stretches into a plugging position towards the interior of a wellhead; at the moment, the push rod pushes the fixing assembly on the surface of the inner rod body to extrude and deform, so that the inner rod body is fixed to the well wall, meanwhile, the limiting base on the surface of the inner rod body applies pressure to the rubber barrel, the rubber barrel deforms to be attached to the well wall in a sealed mode, the blocking effect is achieved, and therefore the large-drift-diameter Christmas tree four-way joint can be replaced conveniently, and an under-pressure operation device is installed conveniently.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas exploitation, in particular to a wellhead hydraulic plugging device. Background Art

[0002] In recent years, casing volume fracturing technology has been widely promoted and applied in oil fields. However, the production contribution capacity of fracturing wells in the middle and late stages of fracturing and blowing gradually decreases, and the blowing and drainage period is relatively long, usually more than 10-20 days depending on the formation energy conditions. It is difficult to blow until the oil well stops blowing completely. After the blowing stops, it is usually necessary to use continuous tubing well killing and other methods to establish wellbore pressure balance before the next step of completion operation can be carried out. The production cycle after fracturing is relatively long, which seriously affects the production speed of the oil well. The liquid pumped in during the later well killing and well washing operations can easily cause reservoir pollution and affect the effect of fracturing.

[0003] Therefore, in order to solve the problems that the long blowout cycle after casing volume fracturing affects the speed of production construction, and the subsequent well killing operation is prone to reservoir pollution and affects the fracturing effect, a wellhead hydraulic plugging device is designed to achieve rapid replacement of the wellhead oil tree under pressure, so as to solve the problem that the production cycle after fracturing is long and affects the speed of oil well production construction. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a wellhead hydraulic plugging device to solve the problems raised in the above background technology that the long blowout period after casing volume fracturing affects the production speed and the later well killing operation easily causes reservoir pollution and affects the fracturing effect.

[0005] The utility model solves the technical problem through the following technical solutions:

[0006] A wellhead hydraulic plugging device comprises a mounting seat, a driving assembly and a plugging assembly;

[0007] Wherein: a connecting flange is installed at the bottom of the mounting seat, a sleeve is provided at the bottom of the connecting flange, and the connecting flange is fixedly connected to the sleeve by bolts;

[0008] The driving assembly comprises a multi-stage hydraulic cylinder fixedly mounted on the top of the mounting seat, a push rod is mounted on the telescopic end of the multi-stage hydraulic cylinder, and an oil inlet is mounted on the top of the multi-stage hydraulic cylinder;

[0009] The blocking assembly includes an inner rod body connected to the bottom of the push rod, a guide head is installed at the bottom end of the inner rod body, fixing assemblies are installed at the top and bottom of the inner rod body, a limit seat is fixedly installed in the middle of the inner rod body, and a rubber cylinder is installed between the two limit seats.

[0010] Moreover, the fixing assembly comprises an upper slip installed on the top of the inner rod body, an upper vertebral body is arranged at the bottom of the upper slip, a lower slip is installed at the bottom of the inner rod body, and a lower vertebral body is arranged at the top of the lower slip.

[0011] Moreover, anti-slip teeth are provided on the surfaces of the upper slip and the lower slip.

[0012] Moreover, a connecting screw sleeve is rotatably mounted on the bottom end of the push rod, a thread groove is provided on the top end of the inner rod body, and the inner rod body is threadedly connected with the connecting screw sleeve through the thread groove.

[0013] Moreover, a pressure sensor is fixedly mounted on one side of the surface of the mounting seat.

[0014] Moreover, a connecting pipe is installed on the other side of the surface of the mounting seat, and a manual valve is installed on the surface of the connecting pipe.

[0015] The advantages and beneficial effects of the utility model are:

[0016] 1. The utility model of the wellhead hydraulic plugging device has a multi-stage hydraulic cylinder installed on the top of the mounting seat, and the hydraulic oil is injected through the oil inlet to push the multi-stage hydraulic cylinder to extend. The extension of the multi-stage hydraulic cylinder drives the push rod to extend, thereby driving the inner rod body to be pressed down by the push rod, and the guide head at the bottom end of the inner rod body extends into the wellhead to the plugging position. At this time, the push rod pushes the fixed component on the surface of the inner rod body to squeeze and deform, so that the inner rod body is fixed to the well wall. At the same time, the limit seat on the surface of the inner rod body presses the rubber cylinder to deform and fit the well wall to seal, thereby playing a plugging role, so as to realize the replacement of the large-diameter oil production tree cross, install the pressure operation device, and solve the problem of long production cycle after fracturing and affecting the production speed of oil wells.

[0017] 2. In the wellhead hydraulic plugging device of the utility model, a pressure sensor is fixedly mounted on one side of the surface of the mounting seat, and the pressure sensor is convenient for detecting whether there is a risk of leakage after plugging. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 It is a side view structural schematic diagram of the utility model;

[0020] Figure 3 This is a schematic diagram of the split structure of the utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the plugging component of the utility model.

[0022] In the figure: 1. mounting seat; 2. connecting flange; 3. sleeve; 4. bolt; 5. drive assembly; 51. multi-stage hydraulic cylinder; 52. push rod; 53. oil inlet; 6. plugging assembly; 61. inner rod body; 62. guide head; 63. fixing assembly; 631. upper slip; 632. upper vertebral body; 633. lower slip; 634. lower vertebral body; 64. limit seat; 65. rubber cylinder; 7. anti-slip teeth; 8. connecting screw sleeve; 9. threaded groove; 10. pressure sensor; 11. connecting pipe; 12. manual valve. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below through specific embodiments. The following embodiments are merely descriptive and not restrictive, and the protection scope of the present invention cannot be limited by them.

[0024] See also Figure 1-Figure 4 A wellhead hydraulic plugging device comprises: a mounting seat 1, a driving assembly 5 and a plugging assembly 6; a connecting flange 2 is mounted at the bottom of the mounting seat 1, a casing 3 is arranged at the bottom of the connecting flange 2, and the connecting flange 2 is fixedly connected to the casing 3 by bolts 4;

[0025] See also Figure 3 The driving assembly 5 includes a multi-stage hydraulic cylinder 51 fixedly mounted on the top of the mounting seat 1 , a push rod 52 is mounted on the telescopic end of the multi-stage hydraulic cylinder 51 , and an oil inlet 53 is mounted on the top of the multi-stage hydraulic cylinder 51 .

[0026] During specific use: a multi-stage hydraulic cylinder 51 is installed on the top of the mounting seat 1, and hydraulic oil is injected through the oil inlet 53 to push the multi-stage hydraulic cylinder 51 to extend. The extension of the multi-stage hydraulic cylinder 51 drives the push rod 52 to extend, thereby driving the inner rod body 61 to be pressed down through the push rod 52, so as to apply pressure to the blocking structure.

[0027] See also Figure 4 The blocking assembly 6 includes an inner rod body 61 connected to the bottom of the push rod 52, a guide head 62 is installed at the bottom end of the inner rod body 61, a fixing assembly 63 is installed at the top and bottom of the inner rod body 61, a limit seat 64 is fixedly installed in the middle of the inner rod body 61, and a rubber cylinder 65 is installed between the two limit seats 64.

[0028] During specific use: the guide head 62 at the bottom end of the inner rod body 61 extends into the wellhead to the sealing position. At this time, the push rod 52 pushes the fixing component 63 on the surface of the inner rod body 61 to squeeze and deform, so that the inner rod body 61 is fixed to the well wall. At the same time, the limit seat 64 on the surface of the inner rod body 61 applies pressure to the rubber tube 65, so that the rubber tube 65 deforms and fits the well wall to seal, thereby playing a sealing role and avoiding gas and liquid leakage to pollute the environment.

[0029] See also Figure 4The fixing assembly 63 includes an upper cava 631 installed on the top of the inner rod body 61, an upper vertebral body 632 is provided at the bottom of the upper cava 631, a lower cava 633 is installed at the bottom of the inner rod body 61, a lower vertebral body 634 is provided at the top of the lower cava 633, and anti-slip teeth 7 are provided on the surfaces of the upper cava 631 and the lower cava 633.

[0030] When used specifically: the fixing assembly 63 includes an upper slip 631 installed on the top of the inner rod body 61 and a lower slip 633 installed on the bottom of the inner rod body 61, an upper vertebral body 632 is provided at the bottom of the upper slip 631, and a lower vertebral body 634 is provided at the top of the lower slip 633. When the push rod 52 applies pressure, the upper slip 631 moves toward the surface of the upper vertebral body 632, and the lower slip 633 moves toward the surface of the lower vertebral body 634, so that the upper slip 631 and the lower slip 633 expand toward the well wall and are fixed on the well wall. The anti-slip teeth 7 provided on the surface of the upper slip 631 and the lower slip 633 can grasp the well wall, further fixing the upper slip 631 and the lower slip 633 on the well wall to prevent loosening.

[0031] See also Figure 3 , Figure 4 A connecting screw sleeve 8 is rotatably mounted on the bottom end of the push rod 52 , and a thread groove 9 is provided on the top end of the inner rod body 61 , through which the inner rod body 61 is threadedly connected to the connecting screw sleeve 8 .

[0032] During specific use: a connecting screw sleeve 8 is installed at the bottom end of the push rod 52, and the inner rod body 61 is threadedly connected to the connecting screw sleeve 8 through a thread groove 9 opened at the top, so that it is easy to push the blocking structure to block.

[0033] See also Figure 2 A pressure sensor 10 is fixedly mounted on one side of the surface of the mounting seat 1 .

[0034] During specific use: a pressure sensor 10 is fixedly mounted on one side of the surface of the mounting seat 1 , and the pressure sensor 10 is convenient for detecting whether there is a risk of leakage in the casing 3 after plugging, so as to facilitate personnel to further detect the plugging of the casing 3 .

[0035] See also Figure 1 A connecting pipe 11 is installed on the other side of the surface of the mounting seat 1 , and a manual valve 12 is installed on the surface of the connecting pipe 11 .

[0036] When used specifically, the connecting pipe 11 installed on the surface of the mounting seat 1 is used to exhaust the gas liquid, and the connecting pipe 11 can be easily opened and closed by rotating the manual valve 12 .

[0037] A multi-stage hydraulic cylinder 51 is installed on the top of the mounting seat 1. Hydraulic oil is injected through the oil inlet 53 to push the multi-stage hydraulic cylinder 51 to extend. The extension of the multi-stage hydraulic cylinder 51 drives the push rod 52 to extend, thereby driving the inner rod body 61 to press down through the push rod 52, so as to apply pressure to the plugging structure. The guide head 62 at the bottom end of the inner rod body 61 extends into the wellhead to the plugging position. When the push rod 52 applies pressure, the upper slip 631 moves toward the surface of the upper vertebral body 632, and the lower slip 633 moves toward the surface of the lower vertebral body 634, so that the upper slip 631 and the lower slip 633 expand toward the well wall and are fixed on the well wall, so that the inner rod body 61 is fixed to the well wall. At the same time, the limit seat 64 on the surface of the inner rod body 61 applies pressure to the rubber cylinder 65, so that the rubber cylinder 65 is deformed and fits and seals with the well wall, which plays a role of plugging, so as to realize the replacement of the large-diameter oil production tree four-way and install the pressure operation device, thereby solving the problem of long production cycle after fracturing and affecting the production speed of oil wells.

[0038] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A wellhead hydraulic plugging device, characterized in that: include: A mounting seat (1), a connecting flange (2) being installed at the bottom of the mounting seat (1), a sleeve (3) being provided at the bottom of the connecting flange (2), and the connecting flange (2) being fixedly connected to the sleeve (3) by bolts (4); A drive assembly (5), the drive assembly (5) comprising a multi-stage hydraulic cylinder (51) fixedly mounted on the top of the mounting seat (1), a push rod (52) being mounted on the telescopic end of the multi-stage hydraulic cylinder (51), and an oil inlet (53) being mounted on the top of the multi-stage hydraulic cylinder (51); A plugging assembly (6), the plugging assembly (6) comprising an inner rod body (61) connected to the bottom of the push rod (52), a guide head (62) being installed at the bottom end of the inner rod body (61), a fixing assembly (63) being installed at the top and bottom of the inner rod body (61), a limit seat (64) being fixedly installed in the middle of the inner rod body (61), and a rubber cylinder (65) being installed between the two limit seats (64).

2. A wellhead hydraulic plugging device according to claim 1, characterized in that: The fixing assembly (63) comprises an upper slip (631) mounted on the top of the inner rod body (61), an upper vertebral body (632) being provided at the bottom of the upper slip (631), a lower slip (633) being mounted on the bottom of the inner rod body (61), and a lower vertebral body (634) being provided at the top of the lower slip (633).

3. A wellhead hydraulic plugging device according to claim 2, characterized in that: Anti-slip teeth (7) are provided on the surfaces of the upper slip (631) and the lower slip (633).

4. A wellhead hydraulic plugging device according to claim 1, characterized in that: A connecting screw sleeve (8) is rotatably mounted on the bottom end of the push rod (52), a thread groove (9) is provided on the top end of the inner rod body (61), and the inner rod body (61) is threadedly connected to the connecting screw sleeve (8) via the thread groove (9).

5. A wellhead hydraulic plugging device according to claim 1, characterized in that: A pressure sensor (10) is fixedly mounted on one side of the surface of the mounting seat (1).

6. A wellhead hydraulic plugging device according to claim 1, characterized in that: A connecting pipe (11) is installed on the other side of the surface of the mounting seat (1), and a manual valve (12) is installed on the surface of the connecting pipe (11).

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