CN2240628Y

CN2240628Y - Self-seal type oil pump

Info

Publication number: CN2240628Y
Application number: CN 95203735
Authority: CN
Inventors: 朱金杜
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-03-01
Filing date: 1995-03-01
Publication date: 1996-11-20
Anticipated expiration: 2005-03-01

Abstract

The utility model relates to an oil extraction device in the petroleum industry. The utility model belongs to the mechanical field. The utility model mainly comprises an oil pipe, a pump barrel, a piston assembly in the pump barrel, and an oil suction rod; the lower part of the pump barrel is screwed with a bottom valve assembly; the valve assembly can be divided into a sieve pipe, a bottom valve anchor, a central valve group; the central valve group can be matched with the bottom valve anchor to seat on a valve seat; the piston assembly also comprises an upper traveling valve, a piston sliding sleeve, and a piston screwed at the lower part of the piston sliding sleeve; the outer part of the piston is provided with a sealing sleeve; the sealing sleeve is made of the soft elastic material. The utility model has the advantages that a user doesn't need to process the special pump barrel and user can use the oil pipe or the old oil barrel; when the utility model is maintained, a user only needs to replace the wearing part, so that the utility model has convenient maintenance.

Description

The self sealing oil well pump

The utility model self sealing oil well pump is the extracting device of oil in the petroleum industry, belongs to mechanical field.

The oil well pump that generally use in present each oil field is tubing pump, and it is divided into whole cartridge type or bush type again.Its pump barrel processing technology is complicated, and its cost accounts for the 70-80% of exchange.And there are many problems again in the oil well pump that uses now, be lowered in the oil well of existing sleeve pipe with oil pipe as pump barrel and bottom valve, plunger and traveling valve are lowered in pump barrel (liner-less pump) or the lining with sucker rod, drive the sucker rod oil pumping that pumps by the ground pumping unit, when underwell pump need overhaul, oil pipe and sucker rod must be removed, underwell pump can be overhauled.Also have plunger and pump barrel or seal with buss form to be the sealing of area gap formula, long-time oil pumping is easy to wear, the gap increases, can cause pump efficiency low or take out not fuel-displaced, so the repair cycle is short, in addition, because plunger is long 1.2 meters big with pump barrel friction area, the pumping unit down stroke is obstructed, and sucker rod is flexible, reduce effective stroke, also can cause pump efficiency low.Have the pump of being exactly to need to adopt special measure to prevent pump barrel bending or lining dislocation in maintenance, accumulating again, it is single-minded not interchangeable that pump barrel cooperates with plunger, brings very big difficulty for the maintenance of pump.

The purpose of this utility model is to overcome above-mentioned shortcoming, and a kind of novel self sealing oil well pump is provided.

Pump barrel of the present utility model can be used all size oil pipe or old pump barrel, piston is soft elasticity line style sealing, its seal compression piston force is to seal voluntarily to the reverse compression power that upper pulling force constituted by means of head of liquid in the oil pipe and pumping unit up stroke, is called self sealing.

The technical solution adopted in the utility model is, pump is made of piston assembly and bottom valve assembly two-part, the oil pipe bottom connects screen casing, drainage outer tube, bottom valve anchor cover, foot valve seat, oil pipe (less than the top tubing size), be lowered to the design well depth, in oil pipe, drop into bottom valve centre valve group from well head, be seated at foot valve seat.The plug assembly of taking over a job under the sucker rod when piston assembly is lowered to the foot oil pipe, by the sucker rod deadweight, is pressed into bottom valve anchor cover with bottom valve centre valve group, grappling bottom valve centre valve group.Because sucker rod is driven by ground pumping unit power, and piston assembly is pumped, up stroke piston seal cover radial expansion sealing, fluid column in the elevate a turnable ladder oil pipe reaches the purpose of oil recovery, and down stroke piston seal cover resilient radial is dwindled, and reduces the down stroke resistance.

The utility model is owing to adopted soft elasticity line style sealing, the flexible sealing of backpressure compression seal cover is manufactured pump barrel thereby need not processing, only gets final product as pump barrel with oil pipe or old pump barrel, owing to reduced down stroke resistance and wearing and tearing, improved the life cycle of pump efficiency and pump.Secondly owing to adopted retrievable type bottom valve assembly, easily damaged parts is driven by sucker rod and removes, and has reduced inspection work operations amount.The 3rd owing to changed the oil well pump seal form, makes oil well pump need not maintenance, only changes easily damaged parts and get final product.

Fig. 1 is a structural profile schematic representation of the present utility model;

Fig. 2 is a piston assembly generalized section of the present utility model;

Fig. 3 is a bottom valve assembly generalized section of the present utility model;

Fig. 4 is a centre valve group generalized section of the present utility model.

(1) is the sleeve pipe of oil well among Fig. 1, other all is the parts of oil well pump, pump barrel (4) wherein is spirally connected in the below of oil pipe (2), join in the centre of pump barrel (4) and pump barrel (4) inwall cunning piston assembly (5) is installed, the upper end of piston assembly (5) is fixed with a sucker rod (3), sucker rod (3) is connected with ground installation, valve seat (6) also is equipped with the way that is spirally connected in bottom at pump barrel (4), drainage outer tube (7) is screwed onto the outer wall of pump barrel (4), be fixed with screen casing (10) and bottom valve anchor (9) in the bottom of drainage outer tube (7), centre valve group (8) and bottom valve anchor (9) matching seat are on valve seat (6).Comprise among said piston assembly (5) Fig. 2, upper travelling valve (11) and be screwed onto following piston sliding sleeve (12), piston (14) is screwed onto the lower end of piston sliding sleeve (12) again, stuffing box gland (13) is installed in the outside of piston sliding sleeve (12) and piston (14), lower travelling valve is screwed onto the lower end of piston (14), the outer wall of piston (14) is a taper, and its gradient is 1: 30, and stuffing box gland (13) can be made of elastic material.Comprise fishing head (20) among centre valve group (8) Fig. 4, sliding sleeve (23) is screwed onto the lower end of fishing head (20), seat pad head (21) and drainage cover (27) are spirally connected and are enclosed within the outside of sliding sleeve (23), between sliding sleeve (23) and drainage cover (27), a spring (24) is arranged, bottom valve body (28) is screwed onto the lower end of drainage cover (27), be processed with bottom valve anchor cover (29) in the lower end of bottom valve body (28), in the outside of bottom (head) (21) a circle bottom valve stuffing box gland (25) is arranged, said bottom valve stuffing box gland (22) and drainage stuffing box gland (25) are oil-resistant rubber material and make.On drainage cover (27) and drainage outer tube (7), all be equipped with plural in leakage opening (26) and outside leakage opening (17).Fig. 3 is centre valve group (8) and structural drawing drainage outer tube (7), constitutes bottom valve assembly structure schematic representation.

Working procedure of the present utility model is: when sucker rod (3) is up,, stuffing box gland (13) strutted reaches good sealing effect, oil is extracted into ground because of piston (14) has a tapering, this moment bottom valve for opening shape, the ball valve of piston assembly (5) is for closing shape.When sucker rod (3) was descending, stuffing box gland (13) was not subjected to the restriction of piston (14) cone, had reduced the frictional force of stuffing box gland (13) with pump barrel, and the ball valve in piston assembly this moment is delivered to pump barrel (4) top for opening shape with oil, and the downstream bottom valve cuts out.Through above repetitive operation oil is extracted out.

The utility model is owing to adopted soft elasticity line style sealing, the sealing of opposite force compression piston Cover sealing, the positive force deblocking, thus seal clearance belongs to arbitrariness, and its advantage is, one, Needn't the special pump barrel of processing and fabricating, only just passable with oil pipe or old pump barrel, two, maintenance The time only need change the consumable accessory sealing shroud, and needn't change pump barrel, when having removed maintenance from whole oil pump And oil pipe proposition ground, only need piston is proposed.

Claims

1, a kind of self sealing oil well pump, it is characterized in that, comprise oil pipe (2), pump barrel (4) is spirally connected in the below of oil pipe (2), join in the centre of pump barrel (4) and pump barrel (4) inwall cunning piston assembly (5) is installed, the upper end of piston assembly (5) is fixed with a sucker rod (3), sucker rod (3) is connected with ground installation, valve seat (6) also is equipped with the way that is spirally connected in bottom at pump barrel (4), drainage outer tube (7) is screwed onto the outer wall of pump barrel (4), be fixed with screen casing (10) and bottom valve anchor (9) in the bottom of drainage outer tube (7), centre valve group (8) and bottom valve anchor (9) matching seat are on valve seat (6).

2, by the described self sealing oil well pump of claim 1, it is characterized in that, said piston assembly (5) comprises, upper travelling valve (11), piston sliding sleeve (12) is screwed onto the lower end of upper travelling valve (11), piston (14) is screwed onto the lower end of piston sliding sleeve (12), and stuffing box gland (13) is installed in the outside of piston sliding sleeve (12) and piston (14), and lower travelling valve is screwed onto the lower end of piston (14).

3, by the described self sealing oil well pump of claim 2, it is characterized in that the outer wall of said piston (14) is a taper, its gradient is 1: 30.

4, by the described self sealing oil well pump of claim 1, it is characterized in that, said centre valve group (8), comprise fishing head (20), sliding sleeve (23) is screwed onto the lower end of fishing head (20), seat end socket (21) is spirally connected with drainage cover (27) and is enclosed within the outside of sliding sleeve (23), between sliding sleeve (23) and drainage cover (27), a spring (24) is arranged, bottom valve body (28) is screwed onto the lower end of drainage cover (27), be processed with bottom valve anchor cover (29) in the lower end of bottom valve body (28), there is a circle bottom valve stuffing box gland (25) outside of present end socket (21), in the outside, lower end of sliding sleeve (23) a circle drainage stuffing box gland (25) is arranged also.

5, by the described self sealing oil well pump of claim 4, it is characterized in that, be equipped with plural interior leakage opening (26) on the said drainage cover (27).