CN2156310Y

CN2156310Y - Multi-group soft sealing oil pump plunger

Info

Publication number: CN2156310Y
Application number: CN 92241840
Authority: CN
Inventors: 石建设
Original assignee: Sinopec Jiangsu Petroleum Exploration Bureau No 1 Production Plant
Current assignee: Sinopec Jiangsu Petroleum Exploration Bureau No 1 Production Plant
Priority date: 1992-11-27
Filing date: 1992-11-27
Publication date: 1994-02-16
Anticipated expiration: 2002-11-27

Abstract

The utility model discloses a new multi-group soft sealing oil pump plunger for deep wells, being mainly composed of an upper and lower valve balls, a valve seat, a valve hood, soft sealing members, supporting press rings and a plunger core rod. Each of the sealing members is made of plastics, or rubber, etc., and a soft plunger is composed of a plurality of the sealing members. The sealing members are separated by the rigid supporting press rings, and the rigid supporting press rings are tightly pressed into a rigid body by screwing in pretightening press caps; radial ducts are arranged on the pretightening press caps and the supporting press rings, and fluid power can act simultaneously on the inner sides of the sealing members; a lower supporting ring is provided with inner sealing inside, and two-level or multi-level sealing can be realized by changing the position of the lower supporting ring or increasing the number of the lower supporting ring. The utility model has the advantages of deep downhole pump setting depth, good sealing performance, long service life, simple structure, convenient field assembly and maintenance, etc.

Description

Multi-group soft sealing oil pump plunger

The utility model relates to a kind of oil field deep well oil well pump sealed oil pump plunger.

The present oil pump plunger piston that uses, as Chinese patent 89210420, its structure is that soft seal and diclinic mouth pressure ring are to overlap to be enclosed within on the plunger body, and adopt the sealing principle of fluid power axial compression radial expansion to realize sealing, this sealing, Sealing pretightening force and best clearance are difficult to be grasped, and Sealing does not produce axial deformation under the axle loading, can not compensate the gap that produces because of wearing and tearing at any time; Diclinic mouth sealing does not possess scrapes function husky and storage fluid, can only realize secondary seal, and has deficiencys such as Sealing is fragile.

The utility model is achieved in that many group soft seal oil pump plunger pistons, mainly by upper and lower valve ball, valve seat, valve bonnet and soft seal, support pressure ring and plunger core bar are formed, and Sealing adopts L type structure, its Sealing is that top is L-shaped, the bottom is the assembly parts of N shape, and it has the husky performance of scraping of L type sealing structure spare, and N type sealing structure spare has high characteristics of wear-resistant life-span, and can prevent effectively that sand and mechanical admixture from entering sealing contact surface, stores a spot of fluid and play lubrication; Sealing is enclosed within on the support pressure ring of upper press ring, and is enclosed within on the plunger core bar, is connected to become a rigidity body with the pretension pressure cap, and pretension pressure cap and support pressure ring are provided with radial hole, by upper press ring, support pressure ring and lower support pressure ring and plunger core bar makeup ring shape space; The O RunddichtringO is housed in the lower support pressure ring, changes the mounting point of lower support pressure ring or increase number, Sealing can be divided into two groups or many groups, realized the secondary of soft seal oil pumping plunger or multi-stage sealed; The plunger core bar is threaded with following valve bonnet; Be provided with valve ball in the following valve bonnet, valve seat is threaded with lower contact; Multifunction conjunction and pretension pressure cap constitute simple locking device; Form tripper by plunger core bar and top cap.Adopt special radial hole that fluid power is delivered to the inboard of each Sealing simultaneously, make plunger have the self-alignment function, reduced the specific contact pressure of Sealing and pump barrel simultaneously, prolonged the wear-out life of soft plunger.

The contrast of the utility model and prior art has that bearing capacity is big, pump is hung dark, long service life, and can repair because of wearing and tearing or eccentric wear gap increase the smooth old pump barrel of working surface, and piston structure is simple, and maintenance cost is low and be convenient to advantage such as mounting or dismounting.

Fig. 1 organizes soft seal oil pumping piston structure schematic representation for the utility model more.

Top cap 13, valve bonnet 14 and lower contact 15 down.

Below in conjunction with accompanying drawing the utility model is further described: valve ball 2 and valve seat that the O RunddichtringO is housed are packed in the upper valve bonnet 1 that has oil-out and multifunction conjunction 5 thread connection, other end external screw thread connects with pretension pressure cap 6, thread connection and tightening on its internal thread and the plunger core bar. Plunger core bar intermediate thread connects with top cap 13 and tightens, and support pressure ring and upper press ring that lower support pressure ring, O-ring seals, cover have seal are housed on it in order. Screw thread connects with lower guiding valve bonnet 14 under the plunger core bar, establishes valve ball and valve seat and joint 15 thread connection in the valve bonnet and tightens. After plunger put into pump barrel (positioning tube) back and forth operation makes the even centering of seal for several times, the pretension pressure cap moves back button with upper press ring, support pressure ring and lower pressure ring compression and becomes a rigidity body, simultaneously with the seal pretension in the given time, and the outer garden face of inboard and plunger core bar forms an annular space, is provided with special aperture at pretension pressure cap and support pressure ring and liquid directly can be imported the inboard that acts on seal. During dismounting, earlier the pretension pressure cap is unscrewed, laid down multifunction conjunction, the top cap moves back and buckles the lower support pressure ring on the plunger core bar, supports pressure ring and upper press ring top and unclamp and lay down one by one then. The quantity of seal is 12～20.

The course of work: when plunger was up, valve ball 2 was closed, and fluid power makes its realization sealing of rising of radially splashing by pore canal role special on the plunger in the inboard of seal, and liquid is discharged well head. When plunger is descending, in the pump liquid by compression, when pump internal pressure during greater than head of liquid, valve ball 2 is opened, this moment, the seal unloading resiled, liquid enters in the oil pipe of plunger upper part through the central duct of plunger and the annular space of seal and pump barrel. Like this plunger ceaselessly back and forth operation in pump barrel makes the interior liquid of well constantly discharge well head.

Embodiment: the utility model can be realized the two-stage sealing when lower support pressure ring 11 being installed in the neutral position, as increase a lower support pressure ring 11 and Sealing 9 can be divided into three groups, Sealing 9 carries out work by three groups, after first group of inefficacy, start working for second group, then start working for the 3rd group, utilize the characteristic of lower support pressure ring 11 can realize many group sealings.

Claims

1, the many group soft seal oil pump plunger pistons of a kind of deep-well oil pump, mainly by upper and lower valve ball, valve seat, valve bonnet and soft seal, support pressure ring and plunger core bar are formed, and it is characterized in that:

A. Sealing adopts L type structure, and its Sealing is that top is L-shaped, and the bottom is the assembly parts of N shape; Sealing (9) is enclosed within on the support pressure ring (10) of upper press ring (8), and be enclosed within on the plunger core bar (7), be connected to become a rigidity body with pretension pressure cap (6), pretension pressure cap (6) and support pressure ring (10) are provided with radial hole, by upper press ring, support pressure ring and lower support pressure ring and plunger core bar makeup ring shape space;

B. in the lower support pressure ring (11) O RunddichtringO (12) is housed, the mounting point or the increase number that change lower support pressure ring (11) can be divided into Sealing (9) two groups or many groups; Plunger core bar (7) is threaded with following valve bonnet (14); Be provided with valve ball in the following valve bonnet, valve seat is threaded with lower contact (15).

C. multifunction conjunction (5) and pretension pressure cap (6) constitute simple locking device; Form tripper by plunger core bar (7) and top cap (13).