CN2353934Y

CN2353934Y - Oil-pump for deep well

Info

Publication number: CN2353934Y
Application number: CN 98220706
Authority: CN
Inventors: 黄翔
Original assignee: HEROU OIL-EXTRACTION FACTORY SHENGLI PETROLEUM ADMINISTRATION
Current assignee: HEROU OIL-EXTRACTION FACTORY SHENGLI PETROLEUM ADMINISTRATION
Priority date: 1998-04-03
Filing date: 1998-04-03
Publication date: 1999-12-15
Anticipated expiration: 2008-04-03

Abstract

The utility model discloses an oil pump for oil pumping in deep wells, being suitable for pumping wells for oil pumping in deep wells. The utility model is composed of a pump barrel and a plunger assembly; the pump barrel is composed of an upper and a lower pump barrels which are connected by a reducer union; an upper piston and a lower piston are connected in series with a pull tube through an oil inlet union. Stress on a pumping rod is uniform during up and down strokes, so that the alternating load of an oil tube and the pumping rod can be greatly reduced, the equilibrium condition of a pumping unit can be improved, the phenomenon of eccentric wear between the pumping rod and the oil tube can be reduced, the accidents of pumping rod parting, oil tube leakage, etc. can be reduced, and the effects are obvious.

Description

A kind of oil well pump that is used for the deep-well oil pumping

The utility model relates to the oil production equipment of petroleum industry, and particularly a kind of oil well pump that is used for the deep-well oil pumping is tubing pump, is applicable to the pumping well of deep-well oil pumping.

Two kinds of existing oil well pump tube-separating type pump and sucker rod pumps, tubing pump is as being used for the deep-well oil pumping, and during upstroke, travelling valve is closed, and standing valve is opened, and the active force of fluid column acts on the sucker rod on the pump; During down stroke, standing valve is closed, and travelling valve is opened, and the active force of fluid column is transferred on the pump on the oil pipe on the pump.R a T all will be subjected to an alternate load effect at each stroke, and R a T is subjected to the result of alternate load effect to cause rod parting for a long time, the leakage of oil pipe screw thread.

The purpose of this utility model is a kind of oil well pump that is used for the deep-well oil pumping of design, rod parting, the oil pipe leakage accident that can avoid sucker rod and oil pipe eccentric wear to be caused, reduce the loss of plunger stroke of oil well pump, the gases affect of cancellation oil well pump improves the equilibrium condition of pumping unit.

The present technique solution can reach above-mentioned purpose, forms the utility model by pump barrel assembly and plunger piston assembly, and pump barrel is made of last pump barrel and following pump barrel, is connected by reducer union, and upper piston and lower piston are serially connected through fuel inlet fitting and trombone slide.

After using the utility model, can obtain following effect:

1, during upper and lower stroke, sucker rod is stressed, and evenly the alternate load of oil pipe and sucker rod reduces significantly, has reduced the generation of the eccentric wear phenomenon of sucker rod and oil pipe and rod parting, oil pipe leakage accident;

2, reduced the loss of plunger stroke of oil well pump;

3, mechanical valve opens and closes rapidly, effectively eliminates the gas lock phenomenon of oil well pump;

4, improved the equilibrium condition of pumping unit.

Accompanying drawing is a structural representation of the present utility model.

Below in conjunction with accompanying drawing the utility model is done further detailed description: referring to accompanying drawing, last pump barrel 3 is connected by reducer union 10 with following pump barrel 12, and sucker rod 1 is connected by delivery connection 2 with pull bar 4.Mechanical valve is made up of mechanical valve 8 and valve seat 7, mechanical valve 8 be connected on pull bar 4 below, valve seat 7 is contained in the bottom of upper piston 6, constitutes the sealing surface that matches with mechanical valve 8 with upper piston 6 is common.Upper piston 6 is enclosed within on the pull bar 4, the top of upper end and valve seat 7 is equipped with centering ring 5 in upper piston 6 holes, machinery valve 8 is serially connected lower piston 13 and upper piston 6 by fuel inlet fitting 9, trombone slide 11, and oil-feed valve 14, valve seat 15 and valve seat pipe close 16 are arranged at the bottom of lower piston 13.During upstroke, sucker rod 1 is up, upper piston 6 is subjected to the effect of friction motionless, when mechanical valve 8 contacts with valve seat 7 when airtight, upper piston 6 beginnings are up, and the crude oil in the pump chamber is drained on the pump in the oil pipe, trombone slide 11 increases with the active chamber that last pump barrel 3 forms simultaneously, form low pressure area, strata pressure backs down oil-feed valve 14, and formation fluid enters in the pump chamber; During down stroke, sucker rod 1 is descending, upper piston 6 is subjected to go up in frictional force and the pump chamber effect of top power and static, it is descending that sucker rod 1 promotes mechanical valve 8, machinery valve 8 separates with valve seat 7, mechanical valve is opened, force 14 of oil-feed valves to be gone on the valve seat 15 by the active force of fluid column and the deadweight of oil-feed valve 14, oiling valve cuts out, fluid column produces thrust down to lower piston 13, during delivery connection 2 contact upper pistons 6, compressing upper piston 6 is descending, and endoporus, the delivery connection 2 of the formation fluid in the pump chamber by valve seat 7, upper piston 6 is discharged on the pump in the oil pipe.Because during upper and lower stroke, sucker rod is stressed, and evenly the alternate load of oil pipe and sucker rod descends significantly, has reduced the eccentric wear phenomenon of sucker rod and oil pipe, effectively prevented the generation often of rod parting, oil pipe leakage accident, effect is remarkable.

Claims

1, a kind of oil well pump that is used for the deep-well oil pumping, form by pump barrel assembly and plunger piston assembly, it is characterized in that pump barrel is made of last pump barrel (3) and following pump barrel (12), connect that upper piston (6) is serially connected through fuel inlet fitting (9) and trombone slide (11) with lower piston (13) by reducer union (10).

2, the oil well pump of deep-well oil pumping according to claim 1, it is characterized in that the mechanical valve in the pump barrel (3) is made up of mechanical valve (8) and valve seat (7), machinery valve (8) is connected on below the pull bar (4), valve seat (7) is contained in the bottom of upper piston (6), constitutes the sealing surface that matches with mechanical valve (8) jointly with upper piston (6).

3, the oil well pump of deep-well oil pumping according to claim 1 is characterized in that upper piston (6) is enclosed within on the pull bar (4), and the upper end of upper piston (6) endoporus and the top of valve seat (7) are equipped with centering ring (6).