CN201301688Y

CN201301688Y - Oil well pipe column check valve

Info

Publication number: CN201301688Y
Application number: CNU2008202307917U
Authority: CN
Inventors: 李奇; 薛毅文; 程宁远; 李庆安
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-12-03
Filing date: 2008-12-03
Publication date: 2009-09-02
Anticipated expiration: 2018-12-03

Abstract

The utility model relates to a check valve, which develops an oil well pipe column check valve, which is characterized in that a prior check valve is improved, and comprises a valve body, a valve seat and a floating ball valve. When a killing well is washed in a reverse circulation, the floating ball valve is automatically and upwardly closed, when the well is washed and pressed in a normal circulation, the floating ball valve is automatically and downwardly opened. The oil well pipe column check valve has the marked advantages that the sealing is reliable, the service life is prolonged, overflow does not exist when constructing, the pollution for ground surface is reduced, the loss of pump pressure is reduced, and the accident potentials of well kick or well blowout are effectively prevented and the like.

Description

A kind of oil well pipe ball-and-seat

Technical field

The utility model belongs to the switch valve technical field, relates to ball-and-seat, is specifically related to a kind of oil well pipe ball-and-seat.

Background technology

Existing ball-and-seat comprises valve body, and valve seat, steel valve ball are bearing on the compression spring, are widely used on the tubing string of oil-water well.In production practices, there is following defective easily:

1. bore plug at oil-water well, when kill-job is washed in sand washing, the steel valve ball relies on fluid pressure to promote the steel valve ball to overcome the spring force open channel, need to produce the pump pressure loss of certain energy;

2. when washing kill-job, the flushing fluid of injection contains sandstone easily to the wearing and tearing of steel valve ball, and application life is short, and repair and replacement often;

3. pulling under the power effect when boring down, drilling rod produces elastic deformation and jarring, Yi Zhen takes off the flake ferric oxide that the drilling rod inwall is corroded and the silt particle of adhesion, on valve seat, pile up, the deposit of piling up is pushed by fluid column when washing kill-job, easily be compacted when spring force is opened passage overcoming, cause passage to be difficult to open, stop up tubing string;

4. when washing kill-job, the compression spring often is damaged, and causes the sealing of steel valve ball malfunctioning;

5. trip-out operating mode is, under the spring force effect, the water in the tubing string can't be drained, and is taken out of pit shaft, contaminated environment not only, and borehole pressure is produced than great fluctuation process, easily bring out well kick or gas blowout accident.

The utility model content

The designer is in the well workover construction practice of being engaged in oil jacket pressure imbalance wells such as oil-water well brill plug, sand washing, find that traditional ball-and-seat exists above-mentioned defective, through investigation, constantly explore, purpose is to provide a kind of oil well pipe ball-and-seat, can solve preferably ball-and-seat use at the scene in existing problem.

Technical solution adopted in the utility model is a kind of oil well pipe ball-and-seat of design, and its structure comprises: valve body, valve seat, float valve, bracing frame.Wherein, described float valve adopts durable ball floats such as hollow steel ball or ball to make float valve, and bracing frame utilizes existing compression spring base, removes the compression spring of support steel valve ball.

The utility model is owing to adopt above technical measures that existing ball-and-seat structure is improved, change the steel ball valve into float valve, remove the compression spring, rely on buoyancy and the liquid upward pressure and the valve seat sphere fitted seal of float valve, at high-pressure well, in the big spillway discharge well construction, bottom pressure is greater than the back pressure of hydrostatic column to the shaft bottom, overflowing liquid flows to ground from the shaft bottom, float valve in the tubing string is under force action, move in the upper limit valve seat, close the tubing string inner chamber, gush on the barrier liquid, on the liquid that gushes can only flow to ground from the oil jacket annular distance, enter slurry tank by threeway and circulation line.When kill-job was washed in direct circulation, pump pressure was higher than the intraluminal fluid column pressure, and under force action, float valve is pushed downwards to bracing frame, opens the tubing string inner chamber, and liquid enters the shaft bottom circulation by the duct on the bracing frame and washes kill-job, and not loss of pump pressure overcomes the energy of compression spring.

Compare with existing ball-and-seat, have following remarkable advantage:

1. simple in structure, sealing is reliable, and the life-span on probation is long, and it is blocked easily to have overcome existing ball-and-seat, the defective of compression spring rapid wear sealing difference;

2. remove the compression spring, reduced the pump pressure loss, reduced resistance, do not reduced discharge capacity;

3. during lift pipe string, liquid in pipe is drained automatically, has reduced the face of land is polluted;

4. removed the compression spring, the deposit on the float valve is broken up, does not stop up in the construction, is beneficial to construction;

5. during trip-out operating mode, liquid level pressure changes for a short time in the well, and it is stable that bottom pressure keeps, and stops and has reduced well kick or gas blowout accident takes place.

Description of drawings

Fig. 1 represents the structure cross-sectional schematic of a kind of oil well pipe ball-and-seat of the utility model.

The specific embodiment

In conjunction with the accompanying drawings and embodiments, further specify the concrete structure of a kind of oil well pipe ball-and-seat of the utility model, its feature and advantage are clearer.

The embodiment 1 of a kind of oil well pipe ball-and-seat of the utility model, referring to Fig. 1, its structure comprises: valve body 1, valve seat 2, float valve 3, bracing frame 4, wherein float valve 3 adopts hollow steel ball, and bracing frame 4 utilizes existing compression spring base.

The embodiment 2 of a kind of oil well pipe ball-and-seat of the utility model, referring to Fig. 1, its structure comprises: in the structure of embodiment 1, float valve 3 adopts ball.

This oil well pipe ball-and-seat of the present utility model is applicable to the borehole pressure height, and the well that spillway discharge is big also is applicable to the construction application of oil jacket pressure imbalance wells such as boring plug, brillization blocking agent, sand washing.Sample shows that through on probation in XX oil field, Nanyang usability is strong, and switch is flexible, and construction environment is optimized in the convenient construction operation, welcome by the trier, has a good application prospect.

Claims

1, a kind of oil well pipe ball-and-seat comprises valve body, valve seat, and ball valve, bracing frame is characterized in that ball valve adopts float valve, bracing frame utilization compression spring base.

2, oil well pipe ball-and-seat as claimed in claim 1 is characterized in that described float valve adopts hollow steel ball or ball as float valve.