CN202483854U

CN202483854U - Efficient oil well pump with variable diameter

Info

Publication number: CN202483854U
Application number: CN201120516383XU
Authority: CN
Inventors: 陈砚军
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-12-12
Filing date: 2011-12-12
Publication date: 2012-10-10
Anticipated expiration: 2021-12-12

Abstract

The utility model relates to an efficient oil well pump with a variable diameter, and the oil well pump comprises a pump barrel, a plunger, and a traveling valve. A fixed valve is disposed on a bottom end of the pump barrel, the plunger is axially slidably mounted in the pump barrel, the plunger comprises an upper valve cover, a mandrel, a lower valve cover, and a traveling valve pair, the upper cover is fixedly mounted on an upper end of the mandrel, the lower valve cover is fixedly mounted on a lower end of the mandrel, the traveling valve pair is mounted in the lower valve cover, an outside wall of the mandrel is sleeved with a rubber sleeve, an outside wall of the rubber sleeve is sleeved with a plurality of eccentric sealing rings from up to down, the plurality of eccentric sealing rings are distributed with a certain included angle in an eccentric direction, projections of the plurality of eccentric sealing rings in an axial direction form an external diameter of the plunger which coincides with an inner diameter of the pump barrel, and through holes are manufactured in the mandrel in accordance with the eccentric direction of the eccentric sealing rings. The oil well pump has the advantages that resistance is small in a downward stroke, seepage loss is little in an upward stroke, and the pump is prevented from being stuck, thus the pump is particularly suitable for use in a well containing sand, fouling or residual polymers, and long-periodic use of the oil well bump can be guaranteed.

Description

A kind of reducing efficient oil-well pump

Technical field

The utility model relates to the petroleum machinery field, is particularly a kind ofly containing sand, contains dirt, is containing the reducing efficient oil-well pump that uses in the residual polyalcohol oil well.

Background technique

At present, the employed oil well pump of field of petroleum exploitation mainly is to adopt the plunger pump structure.It between metal plunger and the pump barrel Spielpassung; Because partial wells liquid composition is complicated, has sand grains or dirt, along with the large size of tertiary oil recovery is implemented; In the well liquid even residual polyalcohol occurred; Residual polyalcohol is prone to be attached to the pump barrel inwall, and these impurity often cause the big or holddown of the descending resistance of plunger, the normal oil pumping of influence operation.

Summary of the invention

The purpose of the utility model is to overcome the deficiency of existing technology, provides a kind of holddown that effectively prevents to reduce the reducing efficient oil-well pump of the descending resistance of plunger simultaneously.

The utility model solves its technical problem and realizes through following technological scheme:

A kind of reducing efficient oil-well pump; Comprise pump barrel, plunger, traveling valve, be provided with standing valve in the pump barrel bottom, plunger axis is in being slidingly mounted on pump barrel; Plunger comprises valve bonnet, mandrel, following valve bonnet, traveling valve pair; The mandrel upper end installs valve bonnet, the mandrel lower end installs down valve bonnet, in the valve bonnet traveling valve pair being installed down, it is characterized in that: at mandrel outer wall suit rubber sleeve; At this rubber sleeve outer wall a plurality of eccentric sealed rings of suit from top to bottom; These a plurality of eccentric sealed rings are in eccentric direction distribution in a certain angle, the plunger that these a plurality of eccentric sealed rings projection formation and pump barrel internal diameter in the axial direction coincide, and corresponding each eccentric sealed ring eccentric direction is shaped on through hole on mandrel.

Advantage of the utility model and beneficial effect are:

The utility model scientific structure design is reasonable, and this oil well pump is in the well that contains sand, dirt or residual polyalcohol, during the plunger down stroke, because matching gap is bigger, so descending resistance is little; During the plunger upstroke, plunger that eccentric sealed ring forms and pump barrel form interference fit, have both reduced wastage, have reduced the probability of holddown again, guarantee that the long period of oil well pump uses.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is that the A-A of Fig. 1 is to sectional view.

Embodiment

Through specific embodiment the utility model is done further to detail below, following examples are descriptive, are not determinate, can not limit the protection domain of the utility model with this.

A kind of reducing efficient oil-well pump; Comprise pump barrel 1, plunger, traveling valve 6; Be provided with standing valve cover 8 and standing valve 9 in the pump barrel bottom, in being slidingly mounted on pump barrel, plunger comprises valve bonnet 2, mandrel 5, following valve bonnet 6, traveling valve secondary 7 at the standing valve plunger axis; The mandrel upper end installs valve bonnet, the mandrel lower end installs down valve bonnet, in the valve bonnet traveling valve pair is being installed down.The innovation part of this oil well pump is: at mandrel outer wall suit rubber sleeve 4, at this rubber sleeve outer wall a plurality of eccentric sealed rings 3 of suit from top to bottom.These a plurality of eccentric sealed rings are in eccentric direction distribution in a certain angle, and each eccentric sealed ring and pump barrel inwall all form local interference fit, the form of local gap.A plurality of eccentric sealed rings projection formation and identical plunger of pump barrel internal diameter in the axial direction, corresponding each eccentric sealed ring eccentric direction is shaped on through hole 10 on mandrel.

The working principle of the utility model is:

During the plunger upstroke; Traveling valve cuts out, and the pressure of fluid column is delivered on the rubber sleeve through the through hole on the mandrel on the pump, and rubber sleeve expands; Driving eccentric sealed ring offset increases; The circular diameter that final all eccentric sealed rings form on axis projection becomes big, and promptly plunger becomes big, forms interference fit with pump barrel.During down stroke, traveling valve is opened, plunger inside and outside differential pressure balance; Rubber sleeve resiles, and drives eccentric sealed ring offset and reduces, and finally the circular diameter that on axis projection, forms of all eccentric sealed rings diminishes; Be that plunger diminishes, form bigger gap with pump barrel.

In containing sand, dirt or residual polyalcohol well, during the plunger down stroke, because matching gap is bigger, therefore descending resistance is little; And when upstroke, plunger that eccentric sealed ring forms and pump barrel form interference fit, have both reduced wastage, have reduced the probability of holddown again.

Claims

1. reducing efficient oil-well pump; Comprise pump barrel, plunger, traveling valve, be provided with standing valve in the pump barrel bottom, plunger axis is in being slidingly mounted on pump barrel; Plunger comprises valve bonnet, mandrel, following valve bonnet, traveling valve pair; The mandrel upper end installs valve bonnet, the mandrel lower end installs down valve bonnet, in the valve bonnet traveling valve pair being installed down, it is characterized in that: at mandrel outer wall suit rubber sleeve; At this rubber sleeve outer wall a plurality of eccentric sealed rings of suit from top to bottom; These a plurality of eccentric sealed rings are in eccentric direction distribution in a certain angle, the plunger that these a plurality of eccentric sealed rings projection formation and pump barrel internal diameter in the axial direction coincide, and corresponding each eccentric sealed ring eccentric direction is shaped on through hole on mandrel.