CN2564738Y

CN2564738Y - Well head sealer

Info

Publication number: CN2564738Y
Application number: CN 02278826
Authority: CN
Inventors: 吴清兰
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-08-14
Filing date: 2002-08-14
Publication date: 2003-08-06
Anticipated expiration: 2012-08-14

Abstract

The utility model relates to a well head sealer comprising a shell body, a packing, and an oil sucking rod. The utility model is characterized in that centralizing units are respectively arranged in the upper and the lower parts of a shell of the centralizing units; three eccentric shafts distributed in 120 DEG are arranged on each centralizing unit; rollers are in rotary match with the eccentric shafts, and the arc-shaped surface of each of the rollers is in sliding match with the oil sucking rod; a hemispheric nest which is matched with a universal adjusting head is arranged on the upper centralizing unit; the lower end of nuts is provided with threaded holes which are matched with screw threads which are arranged at the upper part of the upper centralizer unit; the hemispheric nest which is arranged in the upper centralizing unit is matched with the upper part of the universal adjusting head; screwed holes of a gland are matched with screw threads which are arranged at the upper part of the universal adjusting head; springs, pad sleeves, the packing, and annular scrapers are arranged in the universal adjusting head and the gland; an adjustable secondary sealing piston is arranged in the shell body of the centralizing units, which is arranged between the upper and the lower centralizing units. The utility model is provided with the two centralizing units and one universal adjusting unit, and thereby, the eccentric wear between the oil sucking rod and the packing can be eliminated, the service life of the packing reaches more than half a year, and the effect of the prevention of oil theft is offered.

Description

A kind of wellhead sealing device

(1) technical field:

The utility model belongs to oil production equipment, particularly a kind of wellhead sealing device.

(2) background technology:

Existing wellhead sealing device, because the inclination of oil well, oil pumping polish rod is tilted in well head and can departs from the center with oil well, packing in the sealer is produced eccentric wear, accelerated the packing rate of wear, generally just needed to change packing about 10 days, frequently changing packing not only increases maintenance cost, once need 20-30 minute owing to change, also have a strong impact on oil recovery.In addition, all exist the lawless people stolen among the local peasant savage in each oil field of China, wherein more general stolen means are that the oil pumping polish rod surface is chopped wound, and form sharp-pointed thorn sheet on the polished rod surface, and packing is damaged, and cause the crude oil leakage well outer and stolen.

(3) summary of the invention:

To be that design is a kind of have elimination and cause the wellhead sealing device of packing wearing and tearing function in the well head deflection because of hole deviation causes sucker rod technical problem to be solved in the utility model.Scheme of the present utility model is finished like this, it includes housing, packing and sucker rod, it is characterized in that: an erection device respectively matches in the upper and lower screwed hole of centralizer device shell, this erection device has three to be the pod that 120 degree distribute, each cell wall is provided with perpendicular hole and the eccentric shaft of notch and is rotatably assorted, roller is rotatably assorted on eccentric shaft, the external surface of roller is that a cambered surface and sucker rod surface match, on the erection device shell, be provided with the hole relative with eccentric axle head, the external screw thread that the bottom of following erection device is provided with screw thread and well head matches, the top of last erection device has the spherical of a hemispherical nest and universal adjustment head to match, the lower end of one nut and the screw thread of last erection device match, the hole that the top of this nut has first spheroid with the universal adjustment head to match, be provided with two stepped holes and a taper hole in universal adjustment head and the cylinder thereof, spring, pad and packing place respectively in the above-mentioned stepped hole and taper hole, external screw thread on the internal thread of gland bottom and the universal adjustment headpin body matches, be provided with stepped hole in the gland and match with a gland respectively, sucker rod is through above-mentioned gland, packing, up and down in the hole of erection device.Match at the external screw thread that each side is provided with screwed hole and screw rodb base of the erection device housing between the erection device up and down, two packed-pistons place the sucker rod both sides between the erection device up and down, there is the semicircular arc surface that matches with sucker rod at the center of packed-piston end face, piston bush is connected with packed-piston, regulate the screw thread of screw mandrel and the screwed hole of screw rodb base and match, an end of regulating screw mandrel is connected with piston bush.Be provided with an annular scraper in the stepped hole in the gland of sealer upper end.The utility model is owing to be provided with sucker rod erection device and universal adjusting device in sealer, sucker rod is no longer tilted, thereby prevented the eccentric wear of sucker rod to packing, the life-span of sealer was extended to more than half a year, simultaneously, in the sealer upper port, locate to be provided with the annular scraper of joining, the thorn sheet of being cut out on the sucker rod surface can be struck off with the sucker rod cunning, avoided packing to pull, crude oil is stolen.Solved a difficult problem that troubles the oil field for a long time.

(4) description of drawings:

Fig. 1 is a structural representation of the present utility model; Fig. 2 is A-A and the 8-8 sectional drawing of Fig. 1; Fig. 3 is that the C of Fig. 2 is to partial view.Among the figure, 1. descend erection device 2. erection device shells 3. eccentric shafts 4. needle bearings 5. rollers 6. packed-pistons 7. piston bushs 8. to regulate erection device 11. springs 12. universal adjustment 13. nylon jacket, 14. nuts, 15. packings, 16. nylon glands, 17. scrapers, 18. upper press covers, 19. sucker rod on screw mandrel 9. screw rodb bases 10.

(5) specific embodiment: the utility model includes an erection device shell 2, the inner hole wall of its upper and lower be provided with screw thread respectively with erection device 10 up and down, 1 external screw thread matches, three cannelures that become 120 degree to distribute are arranged in the erection device body, be provided with the hole vertical in the cell wall with groove, place an eccentric shaft 3 in the hole respectively, needle bearing 4 and roller 5 place on the eccentric shaft, the external surface of roller is a cambered surface that matches with sucker rod 19 cylindricals, one end of eccentric shaft 3 is provided with two side's bodies and adjusts use, on the erection device housing, be provided with the hole relative with each eccentric shaft, the lower end of following erection device 1 has a taper hole and a well head that is provided with screw thread to match, the top of last erection device 10 has a hemispherical and universal adjustment 12 to match, the upper end of nut 14 have one with universal adjustment the hole that matches is arranged, its lower end is to be provided with the stepped hole of screw thread and the screw thread of last erection device matches, be provided with two stepped holes and a taper hole in the universal adjustment head from bottom to up successively, spring 11, nylon jacket 13 and packing 15 place respectively in the above-mentioned stepped hole and taper hole, in upper press cover 18, be provided with two stepped holes and a screwed hole from top to bottom, annular scraper 17, nylon gland 16 places in it, and the screw thread of its screwed hole and universal adjustment head matches.The external screw thread that the left and right sides of the erection device shell between upper and lower erection device is respectively equipped with a screwed hole and screw rodb base 9 matches, two are provided with and circular arc end face packed-piston 6 that the sucker rod face of cylinder matches places between the upper and lower erection device of sucker rod both sides, two piston bushs 7 are connected with packed-piston respectively, regulate the screwed hole that screw mandrel 8 places screw rodb base, the one end is connected with piston bush.In this wellhead sealing device, all should establish seal between each connector, guarantee that crude oil does not leak.

The adjusting using method of this wellhead sealing device is, in factory, assemble and adjust, in sealer, penetrate earlier an axle big 0.1 millimeter than the sucker rod diameter, with upper and lower erection device with after the axle levelling, deliver to the oil well place, extract axle out, and the sealing device is enclosed within on the sucker rod of oil well and is connected with well head, adjust upper and lower erection device, eliminate the gap between roller and sucker rod.When oil pumping, packed-piston should break away from sucker rod, when the long-term use of packing warp need be changed, make packed-piston to sucker rod and erection device sealing by regulating screw mandrel earlier, after changing packing, oppositely regulate screw mandrel, packed-piston breaks away from sucker rod can recover the operation of pumping.When lawless people was chopped wound sucker rod, the sucker rod burr that is caused was wiped off through scraper the time, made it to damage packing, thereby reached the purpose that prevents to steal oil.This sealer is on probation through the oil field, and the life-span of packing can reach about half a year.Save the expense of changing packing greatly, improved oil well output, be subjected to the welcome in oil field deeply.

Claims

1, a kind of wellhead sealing device, it includes housing, packing and sucker rod, it is characterized in that: an erection device respectively matches in the upper and lower screwed hole of centralizer device shell, this erection device has three to be the pod that 120 degree distribute, each cell wall is provided with perpendicular hole and the eccentric shaft of notch and is rotatably assorted, roller is rotatably assorted on eccentric shaft, the external surface of roller is that a cambered surface and sucker rod surface match, on the erection device shell, be provided with the hole relative with eccentric axle head, the external screw thread that the bottom of following erection device is provided with screw thread and well head matches, the top of last erection device has the spherical of a hemispherical nest and universal adjustment head to match, the lower end of one nut and the screw thread of last erection device match, the hole that the top of this nut has first spheroid with the universal adjustment head to match, be provided with two stepped holes and a taper hole in universal adjustment head and the cylinder thereof, spring, pad and packing place respectively in the above-mentioned stepped hole and taper hole, external screw thread on the internal thread of gland bottom and the universal adjustment headpin body matches, be provided with stepped hole in the gland and match with a gland respectively, sucker rod is through above-mentioned gland, packing, up and down in the hole of erection device.

2, a kind of wellhead sealing device according to claim 1, it is characterized in that: match at the external screw thread that each side is provided with screwed hole and screw rodb base of the erection device housing between the erection device up and down, two packed-pistons place the sucker rod both sides between the erection device up and down, there is the semicircular arc surface that matches with sucker rod at the center of packed-piston end face, piston bush is connected with packed-piston, regulate the screw thread of screw mandrel and the screwed hole of screw rodb base and match, an end of regulating screw mandrel is connected with piston bush.

3, wellhead sealing device according to claim 1 is characterized in that: be provided with an annular scraper in the stepped hole in the gland of sealer upper end.