CN2198447Y

CN2198447Y - Anti-drop device for screw rod pump oil production system

Info

Publication number: CN2198447Y
Application number: CN 94225815
Authority: CN
Inventors: 黄东
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-02-05
Filing date: 1994-02-05
Publication date: 1995-05-24
Anticipated expiration: 2004-02-05

Abstract

The utility model provides a special anti-drop device for the screw rod pump oil exploitation system of an oil field. The special anti-drop device for the screw rod pump oil exploitation system of an oil field is composed of an upper shell body, a lower shell body, a slide key, a slide key shaft, a slide key spring, a middle sleeve, an upper gasket, and a lower gasket. The special anti-drop device for the screw rod pump oil exploitation system of an oil field is installed between a screw rod oil exploitation pump under a well, and an oil pumping rod. When the special anti-drop device for the screw rod pump oil exploitation system of an oil field clockwise rotates under the working state of oil exploitation, rotary torque is transferred to a screw rod oil exploitation pump by the special anti-drop device for the screw rod pump oil exploitation system of an oil field. When a load under the well reverses at the moment of stopping, the special anti-drop device for the screw rod pump oil exploitation system of an oil field reversely skids, the load and the reverse torque can not be transferred onto the oil pumping rod, and therefore, the doffing of a joint thread is effectively prevented. The special anti-drop device for the screw rod pump oil exploitation system of an oil field has simple structure, low manufacturing cost, and convenient installation and use. The special anti-drop device for the screw rod pump oil exploitation system of an oil field solves one technological problem for the oil exploitation of the screw rod oil exploitation pump.

Description

Anti-drop device for screw rod pump oil production system

The utility model relates to the oil field oil recovery machiner, particularly the anti-drop device of screw pump oil production system special use.

Screw pump oil production system is a kind of applied widely, advanced, novel oil recovery machiner.This pump is to be meshing with each other by helical rotor and helical stator to assemble.The power that drives the rotor rotary work comes from ground drive system, by a sucker rod that couples together successively driving torque is passed to down-hole screw rod oil extraction pump from ground.The oil extraction operation state is for turning clockwise; the inipple of each sucker rod and screw pump upper and lower end inipple can not thrown off; but reverse because of downhole load shutting down moment; sucker rod or screw pump upper and lower end inipple often have the dropout phenomenon; cause many troubles to oil producing operation, even have an accident.

The purpose of this utility model just is to provide a kind of anti-drop device of screw pump oil production system special use, is installed between screw pump and the sucker rod, prevents sucker rod and screw pump inipple generation dropout accident effectively.

The utility model is realized by following technical proposals:

This anti-drop device is made up of upper shell (sliding key sleeve), lower shell body (lower contact), feather key, sliding key shaft, feather key spring, middle cover, upper gasket and lower gasket.Be middle cover between upper shell and the lower shell body, housing inner chamber dress sliding key shaft, the dress feather key is equipped with spring in the sliding key shaft top in the feather key, and packing ring is equipped with in three intersection, top on upper shell bottom, sliding key shaft middle part, the middle cover.

There is internal thread the upper shell upper end of above-mentioned anti-drop device, can match with the male threaded stub of sucker rod; Its lower end has the outside thread of internal thread and middle cover to match.

Lower shell body upper half part of above-mentioned anti-drop device has inner chamber, and lower half portion is male connection.The external diameter of its inner chamber top internal diameter and middle cover bottom is for movingly; Internal thread is arranged at its inner chamber bottom, matches with the outside thread of sliding key shaft lower end.

The feather key of above-mentioned anti-drop device by about two form, its shape with the size identical.Spring groove, outer surface are arranged is the eccentric circle cylinder in the inside, matches with the unidirectional keyway of upper shell inner chamber.

The feather key mounting groove is radially arranged at the sliding key shaft top of above-mentioned anti-drop device, and there is a convex at the middle part, and there is outside thread the lower end, matches with the internal thread of lower shell body, and the external cylindrical surface of sliding key shaft is face movingly.

The feather key spring of above-mentioned anti-drop device is a compression spring, has two up and down, radially installs, and is beneficial to feather key stress balance up and down.

Middle cover upper half part of above-mentioned anti-drop device has outside thread, match with the outside thread of upper shell lower end, between its internal diameter and the sliding key shaft for movingly.

All less than the interior external diameter of lower gasket, upper gasket and sliding key shaft together rotate the interior external diameter of the upper gasket of above-mentioned anti-drop device during work, and lower gasket and upper shell together rotate.

This anti-drop device that the utility model provides is used for after the screw pump oil production system, and its proper functioning that turns clockwise is had no effect.When the counter-rotating of shutdown moment downhole load, but can prevent the inipple dropout effectively, can guarantee ordinary production.This anti-drop device is simple in structure, and manufacture cost is not high, and installation and maintenance are all very easy.

Accompanying drawing 1 is an overall structure plan view of the present utility model.

Accompanying drawing 2 is A-A section plan views of Fig. 1.

Accompanying drawing 3 is sliding key shaft plan views.

Accompanying drawing 4 is B-B section plan views of Fig. 3.

Details are as follows to embodiment of the present utility model in conjunction with the accompanying drawings:

In the accompanying drawing, the 1st, feather key spring, the 2nd, feather key, the 3rd, upper shell (sliding key sleeve), the 4th, upper gasket, the 5th, lower gasket, the 6th, middle cover, the 7th, sliding key shaft, the 8th, lower shell body (lower contact).From figure, can see the shape and the mutual alignment relation of its each parts clearly.During assembling, earlier feather key spring 1 and feather key 2 are put in the keyway on sliding key shaft 7 tops, together put into the inner chamber of upper shell 3 again, refill into upper gasket 4 and lower gasket 5, again middle cover 6 there is outside thread one end to install to the lower end of upper shell 3, at last lower shell body 8 and sliding key shaft 7 is dressed up one by screw thread.

This anti-drop device upper end is installed by screw thread with sucker rod and is connected, and its lower end is also installed by screw thread with screw pump and is connected.When ground drive system drive sucker rod turns clockwise, the upper shell 3 that sucker rod just drives anti-drop device turns clockwise, upper shell 3 drives feather key 2 by the unidirectional keyway of its inner chamber, feather key 2 drives sliding key shaft 7 again and lower shell body 8 turns clockwise together, runs well thereby drive subsurface progressive cavity.At this moment, each joint of screw pump and sucker rod can not threaded off.When the ground drive system was shut down the downhole load counter-rotating, 2 of unidirectional keyway of the inner chamber of anti-drop device upper shell 3 and chutes oppositely skidded, and make sucker rod not bear reactive torque, so inipple can not threaded off yet.Thereby reach the anticreep purpose.

Claims

1, a kind of screw pump oil production system anti-drop device, it is characterized in that forming by upper shell, lower shell body, feather key, sliding key shaft, feather key spring, middle cover, upper gasket and lower gasket, be middle cover between upper shell and the lower shell body, housing inner chamber dress sliding key shaft, dress feather key in the sliding key shaft top, spring is housed in the feather key, and packing ring is equipped with in three intersection, top on upper shell bottom, sliding key shaft middle part, the middle cover.

2, screw pump oil production system anti-drop device according to claim 1 is characterized in that there is internal thread the upper shell upper end of anti-drop device, can match with the male threaded stub of sucker rod, and there is internal thread its lower end, matches with the outside thread of middle cover.

3, screw pump oil production system anti-drop device according to claim 1, the lower shell body upper half part that it is characterized in that anti-drop device has inner chamber, lower half portion is male connection, the external diameter of its inner chamber top internal diameter and middle cover bottom is for movingly, internal thread is arranged at its inner chamber bottom, matches with the outside thread of sliding key shaft lower end.

4, screw pump oil production system anti-drop device according to claim 1, the feather key that it is characterized in that anti-drop device by about two form, its shape is identical with size, there is spring groove the inside, outer surface is the eccentric circle cylinder, matches with the unidirectional keyway of upper shell inner chamber.

5, screw pump oil production system anti-drop device according to claim 1, the feather key mounting groove is radially arranged at the sliding key shaft top that it is characterized in that anti-drop device, and there is a convex at the middle part, and there is outside thread the lower end, match with the internal thread of lower shell body, the external cylindrical surface of sliding key shaft is face movingly.

6, screw pump oil production system anti-drop device according to claim 1 is characterized in that the feather key spring of anti-drop device is a compression spring, has two up and down, radially installs.

7, screw pump oil production system anti-drop device according to claim 1 is characterized in that middle cover upper half part of anti-drop device has outside thread, match with the outside thread of upper shell lower end, between its internal diameter and the sliding key shaft for movingly.

8, screw pump oil production system anti-drop device according to claim 1, the interior external diameter of upper gasket that it is characterized in that anti-drop device is all less than the interior external diameter of lower gasket, and upper gasket and sliding key shaft together rotate during work, and lower gasket and upper shell together rotate.