Wellhead device with automatic centering function

Abstract

The utility model discloses an automatic centering wellhead device and relates to the technical field of oil production wellheads. A centering body is installed between the pressing cap and the well mouth, the ball body and the well mouth are connected through a lower ball seat, a sealing gasket is installed on the lower ball seat, the sealing gasket and the ball body are in spherical surface sealing, an upper ball seat is installed between the pressing cap and the ball body, and a packing pipe extends out of the pressing cap to be in threaded connection with the centering cap and is filled with packing. And a gland is arranged between the lower part of the centering cap and the packing filler. The centering device has the advantages that the centering body and a well mouth can rotate around the ball body in a sealing mode, the centering cap is arranged on the upper portion of the packing, the three idler wheels are arranged on the centering cap and attached to the outer circle of the sucker rod, and when the sucker rod is not centered with the well mouth, the sucker rod swings to drive the centering cap and the centering body to rotate around the ball body. Therefore, the sucker rod is completely centered with the centering cap and the centering body, the phenomenon of eccentric wear to packing filler is avoided, and the sealing performance of a wellhead is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil production well head technical field especially, relate to a well head device of automatic centering. BACKGROUND

[0002] Oil production well head all pass through packing to seal the pressure of well head interior to the sucker rod, because the sucker rod and well head cannot be completely centered between, the upper and lower movement of sucker rod leads to the eccentric wear of packing, thereby producing leakage. SUMMARY

[0003] In order to solve the problem that the current oil production well head is easy to produce leakage, the utility model provides a well head device of automatic centering.

[0004] The utility model provides a technical scheme: a well head device of automatic centering, including well head, well head screw thread connection pressure cap, the installation of centering body between pressure cap and well head, and the centering body includes the ball of lower part and the packing tube of upper part, and the ball is connected through lower ball seat between well head, and the installation of sealing washer is carried out on lower ball seat, and the spherical surface sealing between sealing washer and ball, and the installation of upper ball seat is carried out between pressure cap and ball, and the packing tube stretches out pressure cap screw thread connection centering cap, and the packing tube is filled with packing, and the installation of gland is carried out between the lower part of centering cap and packing,

[0005] The ball, gland and centering cap all process center hole and accommodate the sucker rod to pass through;

[0006] The centering cap is opened in three circumferential distribution guide grooves, and the guide groove is slidably connected with support frame, and the support frame is rotatably connected with the roller on the inner side, and the compression spring is arranged between the outer end of support frame and the bottom of guide groove, and the outer end of support frame is fixedly connected with the mandrel, and the mandrel is screw connected with the nut after stretching out centering cap.

[0007] The compression spring is arranged between pressure cap and upper ball seat.

[0008] The outer circle of gland is opened with inner ring groove, and the edge hole is opened on the upper part of packing tube, and the edge hole is communicated with inner ring groove and the inner hole of gland, and the outer ring groove is opened on the packing tube at the position of inner ring groove, and the counterbore is opened downward on the upper end of the wall of packing tube, and the counterbore extends downward through outer ring groove, and the bypass hole is opened on the outer circle of packing tube, and the bypass hole is crossed and communicated with counterbore.

[0009] The utility model has the advantages that: the centering body and well head can be sealed and rotated around the ball, the centering cap is arranged on the upper part of packing, three rollers are arranged on the centering cap and are attached to the outer circle of sucker rod, when the sucker rod is not centered with well head, the rotation of centering cap and centering body around the ball is driven by the swing of sucker rod, so that the sucker rod is completely centered with centering cap and centering body, eccentric wear phenomenon is not caused to packing, and the sealing property of well head is improved. BRIEF DESCRIPTION OF DRAWINGS

[0010] ATTACHFigure 1 is a structural schematic view of the utility model;

[0011] attached Figure 2 is attached Figure 1 A-A section view of the utility model;

[0012] attached Figure 3 is attached Figure 1 B enlarged view of the utility model;

[0013] attached Figure 4 is the structure schematic view of the centering body in the utility model.

[0014] In the figure 1-wellhead, 2-centering body, 201-stuffing tube, 202-sphere, 203-through hole, 3-press cap, 4-centering cap, 5-sucker rod, 6-lower ball seat, 7-upper ball seat, 8-sealing pad, 9-packing, 10-roller, 11-support frame, 12-core shaft, 13-nut, 14-guiding groove, 15-pressing cover, 16-bypass hole, 17-side hole, 18-inner ring groove, 19-outer ring groove, 20-counterbore. DETAILED DESCRIPTION

[0015] As Figures 1 to 4 shown, an automatic centering wellhead device, including wellhead 1, wellhead 1 is screwed to press cap 3, and press cap 3 and wellhead 1 are installed with centering body 2, centering body 2 includes lower sphere 202 and upper stuffing tube 201, sphere 202 and wellhead 1 are connected through lower ball seat 6, lower ball seat 6 is installed with sealing pad 8, sealing pad 8 is spherical surface sealed between sphere 202, press cap 3 and sphere 202 are installed with upper ball seat 7, stuffing tube 201 extends press cap 3 and is screwed to centering cap 4, stuffing tube 201 is filled with packing 9, and centering cap 4 is installed with pressing cover 15 between lower part and packing 9;

[0016] Sphere 202, pressing cover 15 and centering cap 4 are all machined with center hole to accommodate sucker rod 5 to pass through;

[0017] Three circumferentially distributed guiding grooves 14 are opened in centering cap 4, guiding groove 14 is slidably connected with support frame 11, support frame 11 is rotatably connected with roller 10 on the inner side, compression spring is arranged between the outer end of support frame 11 and the bottom of guiding groove 14, core shaft 12 is fixedly connected with the outer end of support frame 11, and core shaft 12 is screwed to nut 13 after extending from centering cap 4.

[0018] The centering body 2 and the wellhead 1 can be sealed and rotated around the ball 202. The centering cap 4 is arranged on the upper part of the packing 9. Three rollers 10 are arranged on the centering cap 4 and are attached to the outer circle of the sucker rod 5. When the sucker rod 5 is not centered with the wellhead 1, the sucker rod 5 swings and drives the centering cap 4 and the centering body 2 to rotate around the ball 202, so that the sucker rod 5 is completely centered with the centering cap 4 and the centering body 2, and the packing 9 is not eccentrically worn, thereby improving the sealing performance of the wellhead 1.

[0019] The compression spring is arranged between the pressure cap 3 and the upper ball seat 7, and the sealing of the ball 202 always has a certain pre-tightening force.

[0020] The outer circle of the gland 15 is provided with an inner ring groove 18. The upper part of the gland 15 is provided with a side hole 17. The side hole 17 is in communication with the inner ring groove 18 and the inner hole of the gland 15. The filler pipe 201 is provided with an outer ring groove 19 at the position of the inner ring groove 18. The upper end of the pipe wall of the filler pipe 201 is downwardly provided with a counterbore 20. The counterbore 20 extends downwardly through the outer ring groove 19. The outer circle of the filler pipe 201 is provided with a bypass hole 16. The bypass hole 16 is in cross communication with the counterbore 20, so that the rainwater entering the gland 15 can be discharged, thereby avoiding the rainwater from being immersed on the packing 9 and increasing the friction force with the sucker rod 5.

Claims

1. An automatic centering wellhead arrangement comprising a wellhead (1), characterized in that: The well head (1) is screwed with the pressure cap (3), and the centering body (2) is installed between the pressure cap (3) and the well head (1), the centering body (2) comprises the lower ball (202) and the upper packing pipe (201), the ball (202) is connected with the well head (1) through the lower ball seat (6), the sealing gasket (8) is installed on the lower ball seat (6), the sealing gasket (8) is in spherical surface sealing with the ball (202), the upper ball seat (7) is installed between the pressure cap (3) and the ball (202), the packing pipe (201) extends out of the pressure cap (3) to be screwed with the centering cap (4), the packing pipe (201) is filled with the packing (9), the pressure cap (4) is installed between the lower part of the packing pipe (201) and the packing (9). The ball (202), the pressure cap (4) and the centering cap (4) are all processed with the center hole to accommodate the sucker rod (5) to pass through; The centering cap (4) is opened with three circumferentially distributed guide grooves (14), the support frame (11) is slidably connected in the guide groove (14), the roller (10) is rotatably connected in the support frame (11), the compression spring is arranged between the outer end of the support frame (11) and the bottom of the guide groove (14), the core shaft (12) is fixedly connected with the outer end of the support frame (11), and the core shaft (12) extends out of the centering cap (4) to be screwed with the nut (13).

2. A self-aligning wellhead assembly according to claim 1, characterized in that: The compression spring is arranged between the pressure cap (3) and the upper ball seat (7).

3. An automatic centering wellhead assembly according to claim 1, characterized in that: The outer circle of the pressure cap (15) is opened with the inner ring groove (18), the edge hole (17) is opened on the pressure cap (15), the edge hole (17) communicates the inner ring groove (18) with the inner hole of the pressure cap (15), the outer ring groove (19) is opened on the packing pipe (201) at the position of the inner ring groove (18), the counterbore (20) is opened downward on the upper end of the pipe wall of the packing pipe (201), the counterbore (20) extends downward through the outer ring groove (19), the bypass hole (16) is opened on the outer circle of the packing pipe (201), and the bypass hole (16) is cross communicated with the counterbore (20). The outer circle of the pressure cap (15) is opened with the inner ring groove (18), the edge hole (17) is opened on the pressure cap (15), the edge hole (17) communicates the inner ring groove (18) with the inner hole of the pressure cap (15), the outer ring groove (19) is opened on the packing pipe (201) at the position of the inner ring groove (18), the counterbore (20) is opened downward on the upper end of the pipe wall of the packing pipe (201), the counterbore (20) extends downward through the outer ring groove (19), the bypass hole (16) is opened on the outer circle of the packing pipe (201), and the bypass hole (16) is cross communicated with the counterbore (20).

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