A Christmas tree follower seat pressure sealing device

Abstract

The present invention relates to a Christmas tree follower seat pressure sealing device. It mainly solves the problem that the existing well sealer and the light rod are offset, causing serious wear to the light rod and shortening the service life of the parts. It is characterized in that: the upper and lower ends of the packing box body are respectively threadedly connected to the packing box pressure cover and the upper pipe of the follower pipe; the outer part of the packing box body is connected to a push barrel positioning nut, the middle inner cavity of the upper pipe of the follower pipe is a cylindrical push barrel guide tube section, and the lower end of the push barrel guide tube section is a well sealing rubber plug conical seat section; the well sealing rubber plug push barrel is in the push barrel guide tube, and the well sealing rubber plug is installed in the conical seat of the well sealing rubber plug; the lower end of the upper pipe of the follower pipe is pressed with the upper end of the follower pipe; and the lower end of the follower pipe is pressed with the lower pipe of the follower pipe. The Christmas tree follower seat pressure sealing device has the function of using the axis seat of the light rod to seal the leakage of the bottom hole pressure, and can move with the moving trajectory of the light rod, so as to realize the flexible connection between the well sealer and the Christmas tree to overcome the hard friction between the light rod and the well sealer, thereby extending the service life of the parts.

Description

Technical Field

[0001] The invention relates to the technical field of oil field production, in particular to a follower seat pressure sealing device for an oil tree. Background Art

[0002] The well sealer is an indispensable mechanism for ensuring the shutdown of the pumping unit and sealing the polished rod to control the liquid spillage at the bottom of the well. As the pumping unit has been in operation for many years, the foundation of the pumping unit or the surface casing of the oil well has been displaced due to formation changes or mechanical deformation, destroying the alignment of the three points of the donkey head, the polished rod, and the well sealer at the wellhead. The well sealer and the polished rod are offset, and the following defects have appeared after long-term use.

[0003] (1) Misalignment or slight bending of the polished rod will accelerate the wear of the sealing plug of the well plug and the polished rod, resulting in frequent replacement of the well plug and the polished rod.

[0004] (2) The existing well plugging devices all use double-sided symmetrical opening and closing rubber plug valves. The lead screw is exposed for many years and oxidized and corroded, which makes opening and closing difficult. In addition, the eccentric wear of the light rod will cause loose closing.

[0005] (3) The existing well plugging device is rigidly connected to the Christmas tree and cannot produce hard friction with the dynamic movement of the polished rod; and the deviation from the centering will cause great damage to the flexible polished rod used in the long-stroke pumping unit. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the problem in the background technology that the existing well plugger and the polished rod are offset, causing serious wear to the polished rod and shortening the service life of the parts, and to provide a Christmas tree follower seat pressure well plugger, which has the function of using the polished rod axis seat pressure to seal and control the leakage of bottom hole pressure, and can move with the moving trajectory of the polished rod to achieve a flexible connection between the well plugger and the Christmas tree, overcome the hard friction between the polished rod and the well plugger, and thus eliminate the technical defect of hard damage to the flexible polished rod of a long-stroke oil pumping unit.

[0007] The present invention solves the problem through the following technical scheme: the Christmas tree follower seat pressure sealing device comprises a packing box body, the upper and lower ends of the packing box body are formed with threads, the bottom of the packing box body is embedded with a well-sealing rubber plug push barrel, the upper and lower ends of the packing box body are respectively connected to the packing box pressure cover and the follower pipe upper connecting pipe by threads; the outside of the packing box body is connected with a push barrel positioning nut, the middle inner cavity of the follower pipe upper connecting pipe is a cylindrical push barrel guide tube section, and the lower end of the push barrel guide tube section is a well-sealing rubber plug conical seat section; the well-sealing rubber plug push barrel is in the push barrel guide tube, and the well-sealing rubber plug is installed in the conical seat of the well-sealing rubber plug; the lower end of the follower pipe upper connecting pipe is press-fitted with the follower pipe upper end; the lower end of the follower pipe is press-fitted with the upper end of the follower pipe lower connecting pipe.

[0008] Preferably, a follower tube load-bearing sleeve is installed in the follower tube, and the upper and lower ends of the follower tube load-bearing sleeve are in contact with the lower end surface of the follower tube upper connecting pipe and the upper end surface of the follower tube lower connecting pipe respectively.

[0009] Preferably, the follower tube load-bearing sleeve is a cylindrical helical elastic body, and the helical elastic body is a helical spring.

[0010] Preferably, the well sealing rubber plug is two semi-cylinders with tapered lower ends.

[0011] Preferably, a rotating flange is provided in the middle of the packing box.

[0012] Preferably, the rotating flange is placed on the upper part of the pushing barrel positioning nut.

[0013] Preferably, the packing box cavity can be filled with sealing packing.

[0014] Preferably, a sealing ring is installed between the upper connecting pipe of the follower pipe and the sealing rubber plug pressure barrel.

[0015] Preferably, the outer layer of the lower end of the follower tube upper connecting pipe is equipped with a follower tube press-fit connecting pipe for pressing the upper end of the follower tube; the lower end of the follower tube is connected to the follower tube lower connecting pipe by press-fitting.

[0016] Preferably, a clamp head is connected to the lower end of the follower pipe lower connecting pipe, and the clamp head is connected to the Christmas tree.

[0017] Compared with the above background technology, the present invention has the following beneficial effects:

[0018] (1) The Christmas tree follower seat pressure well sealer simplifies the traditional bilaterally symmetrical switch well sealer's main components such as the valve body and handwheel, and is designed to use the light rod as a guide shaft to achieve seat pressure sealing through the rotation of the packing box body. The traditional well sealer is connected to the Christmas tree by threaded rigidity and cannot move with the up and down movement of the light rod, which accelerates the wear of the packing, the light rod and the well sealer plug, and greatly damages the flexible light rod of the long-stroke oil pump. The present invention uses a follower pipe as a connecting piece between the well sealer and the Christmas tree, which can move with the running trajectory of the light rod, always keep the well sealer and the light rod concentric, and eliminate the shortcomings of the existing technology.

[0019] (2) Under the action of the threads of the packing box body and the threads of the upper pipe of the follower pipe, the sealing plug push barrel moves downward in the push barrel guide tube, pressing the sealing plug into the conical seat of the sealing plug. Under the action of pressure, the plug deforms and expands in the conical seat to seal the space between the bare rod and the conical seat, thereby sealing the bottom hole pressure leakage channel. The reverse operation opens the bottom hole pressure leakage channel.

[0020] (3) The structure is simple and the sealing effect is good, which is particularly suitable for the wellbore sealing device requirements of the flexible bare rod pumping unit Christmas tree. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Attached Figure 1 It is a front view of the present invention;

[0022] Attached Figure 2 Yes Figure 1 AA cross-sectional view;

[0023] Attached Figure 3 It is a structural schematic diagram of the pushing unit of the present invention;

[0024] Attached Figure 4 It is a cross-sectional view of the follower unit structure of the present invention.

[0025] In the figure: 1. Packing box gland; 2. Packing box body; 3. Packing box body rotating flange; 4. Push barrel positioning nut; 5. Follower pipe upper connecting pipe; 6. Follower pipe; 7. Follower pipe lower connecting pipe; 8. Well sealing plug push barrel; 9. Push barrel sealing ring installation groove; 10. Sealing ring; 11. Push barrel guide tube section; 12. Well sealing plug; 13. Well sealing plug conical seat section; 1.4 Follower pipe load-bearing sleeve; 15. Clamp head. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings:

[0027] As attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 As shown, the Christmas tree follower seat well sealing device comprises a packing box body 2, the upper and lower ends of which are threaded, a well sealing rubber plug push barrel 8 is embedded in the bottom of the packing box body 2, and the upper and lower ends of the packing box body 2 are respectively connected to the packing box gland 1 and the follower pipe upper pipe 5 by threads; the packing box body 2 cavity can be filled with sealing packing, and the packing box body 2 and the well sealing rubber plug push barrel 8 can be an integrated structure; the packing box body 2 is connected to the outside with a push barrel positioning nut 4, and the position of the well sealing rubber plug push barrel 8 embedded in the packing box body 2 can be controlled by tightening the push barrel positioning nut 4, so that the well sealing rubber plug push barrel 8 is fixed in the desired position; the outer diameter of the sealing rubber plug push barrel 8 is provided with a sealing ring installation groove 9, and the sealing ring installation groove is inlaid with a sealing ring 10; as shown Figure 3As shown, the packing box body 2 and the sealing rubber plug push barrel 8 constitute a pushing unit, and a packing box body rotating flange 3 is provided in the middle of the packing box 2, which is used to rotate the packing box body 2 and drive the sealing rubber plug push barrel 8 to move up and down under the action of the thread, so as to realize the up and down pushing function of the pushing unit; the packing box body rotating flange 3 is placed on the upper part of the push barrel positioning nut 4; the upper pipe 5 of the follower pipe is hollow as a cylindrical push barrel conduit section 11, and the lower end of the push barrel conduit section 11 is a well-sealing rubber plug conical seat section 13; the well-sealing rubber plug push barrel 8 is in the push barrel conduit section 11, and a sealing ring 10 is installed between the upper pipe 5 of the follower pipe and the sealing rubber plug pressure barrel 8 to ensure the sealing effect of the well-sealing rubber plug push barrel 8 when it moves up and down in the push barrel conduit section 11; the sealing rubber plug 12 is guided and installed in the conical seat section 13 of the well-sealing rubber plug, and the well-sealing rubber plug 12 is composed of two lower The end is a conical semi-cylinder, which can shrink in the conical seat under the pressure of the sealing plug pressure barrel 8 to complete the seal with the light rod and realize the well sealing function. The sealing plug 12 is a two-piece structure, which is easy to disassemble and assemble; the outer layer of the lower end of the follower tube upper pipe 5 is equipped with a follower tube press-fitting connecting pipe for pressing the upper end of the follower tube 6; the lower end of the follower tube 6 is pressed onto the follower tube lower pipe 7; the follower tube 6 is equipped with a follower tube bearing sleeve 14 inside, and the follower tube bearing sleeve 14 is a rigid spiral elastomer, and the spiral elastomer is a spiral spring, which can swing with the movement and deviation of the follower tube 6; the upper and lower ends of the follower tube bearing sleeve 14 are in contact with the upper and lower end surfaces of the follower tube upper pipe 5 and the follower tube lower pipe 7 respectively, and can swing with the movement and deviation of the light rod, and can replace the follower tube 6 to bear the weight of the light rod and the sucker rod when the pumping unit is unloaded; Figure 4 As shown, the follower pipe upper pipe 5, the follower pipe 6, and the follower pipe bearing sleeve 14 constitute the follower unit of the present invention; the lower end of the follower pipe lower pipe 7 is connected with a clamp head 15 for connecting to the Christmas tree.

[0028] The use and working process of the Christmas tree follower pressure sealer are as follows:

[0029] The oil tree follower seat pressure well sealer, when it is necessary to seal the bottom hole pressure, loosen the push barrel positioning nut 4, use a tool to clamp the packing box body rotating flange 3, rotate the packing box body clockwise, under the action of the packing box body thread and the follower pipe upper pipe 5 thread, the well sealing plug push barrel 8 moves down in the push barrel guide tube 11, and the well sealing plug 12 is pressed into the well sealing plug conical seat 13. Under the action of pressure, the plug deforms and expands in the conical seat to seal the space between the light rod and the conical seat to achieve the function of blocking the bottom hole pressure leakage channel. When the packing box body is rotated counterclockwise, the well sealing plug push barrel 8 moves upward, and the well sealing plug 12 resets the bottom hole channel to open under the action of its own elasticity, and tightens the push barrel positioning nut 4, so that the well sealing plug push barrel 8 can be fixed at the desired position.

[0030] The oil tree follower seat pressure well sealer has a follow-up function. When the oil pumping unit's polished rod and the well sealer are offset during production, the well sealer will drive the follower pipe 6 to move with the movement of the polished rod, always keeping the well sealer and the polished rod concentric, eliminating the hard friction between the polished rod and the well sealer caused by the rigid connection between the traditional well sealer and the oil tree. The follower pipe is made of a high-pressure resistant and corrosion-resistant flexible rubber tube that can meet the follow-up technical requirements. The follower pipe bearing sleeve 14 is a cylindrical spiral elastic body, which is a spiral spring and can swing with the movement and offset of the follower pipe 6. When the oil pump is unloaded, it can replace the follower pipe 6 to bear the weight of the polished rod and the sucker rod.

[0031] The above are some embodiments of the present invention, but the present invention should not be limited to the contents disclosed in the embodiments and drawings. Therefore, any equivalent or modification completed without departing from the technical solution disclosed in the present invention shall fall within the scope of protection of the present invention.

Claims

1. A Christmas tree follower well sealer, comprising a packing box (2), characterized in that: The packing box body (2) is provided with threads at the upper and lower ends. A sealing rubber plug push barrel (8) is embedded at the bottom of the packing box body (2). The upper and lower ends of the packing box body (2) are respectively connected to the packing box gland and the upper connecting pipe (5) of the follower pipe by threads; the outer portion of the packing box body (2) is connected to a push barrel positioning nut (4); the inner cavity in the middle of the upper connecting pipe (5) of the follower pipe is a cylindrical push barrel conduit section (11), and the lower end of the push barrel conduit section (11) is a sealing rubber plug conical seat section (13); the sealing rubber plug push barrel (8) is located in the push barrel conduit section (11), and the sealing rubber plug conical seat section (13) is provided with a sealing rubber plug (12); the lower end of the upper connecting pipe (5) of the follower pipe is press-fitted onto the upper end of the follower pipe (6); the lower end of the follower pipe (6) is press-fitted onto the upper end of the lower connecting pipe (7) of the follower pipe; A follower tube load-bearing sleeve (14) is installed in the follower tube (6), and the upper and lower ends of the follower tube load-bearing sleeve (14) are in contact with the lower end surface of the follower tube upper pipe (5) and the upper end surface of the follower tube lower pipe (7) respectively; The follower tube load-bearing sleeve (14) is a columnar helical elastic body, and the helical elastic body is a helical spring.

2. The Christmas tree follower well sealer according to claim 1, characterized in that: A packing box rotating flange (3) is provided in the middle of the packing box (2).

3. The Christmas tree follower well sealer according to claim 2, characterized in that: The packing box rotating flange (3) is placed on the upper part of the push barrel positioning nut (4).

4. The Christmas tree follower well sealer according to claim 1, characterized in that: The packing box body (2) and the well sealing rubber plug push barrel (8) are an integrated structure; the cavity of the packing box body (2) is filled with sealing packing.

5. The Christmas tree follower well sealer according to claim 1, characterized in that: A sealing ring is installed between the upper connecting pipe (5) of the follower pipe and the well sealing rubber plug pushing barrel (8).

6. The Christmas tree follower well sealer according to claim 1, characterized in that: The outer layer of the lower end of the follower tube upper connecting pipe (5) is provided with a follower tube press-fit connecting pipe for pressing the upper end of the follower tube (6); the lower end of the follower tube (6) is connected to the follower tube lower connecting pipe (7) by press-fitting.

7. The Christmas tree follower well sealer according to claim 1, characterized in that: The lower end of the follower pipe lower connecting pipe (7) is connected to a clamp head (15), and the clamp head (15) is connected to the Christmas tree.

8. The Christmas tree follower well sealer according to claim 1, characterized in that: The well sealing rubber plug (12) is composed of two semi-cylinders with tapered lower ends.

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