CN108252678A - A kind of down-hole plugging device of uncoupling plunger tubing pump snubbing serving - Google Patents

Abstract

The present invention relates to oil pipeline field of operation,Belong to the improvement of plugging device structure under uncoupling plunger tubular type pump sump,Particularly a kind of down-hole plugging device of uncoupling plunger tubing pump snubbing serving,Plunger pump is connected to including being located at the sucker rod in the tubing string on pumping,Release pipe is connected in the lower port of tubing string on pump,The lower port of release pipe is connected to pump barrel,Lower end in pump barrel sets seal boss,Pump barrel is connected to pump lower tubing string,The lower end closed of the lower tubing string of pump,The plunger pump being fitted in pump barrel,The upper end is connected to sucker rod by plunger on-off connector,The lower end of plunger pump is connected to fixed valve by fixed valve on-off connector,The block machine cover of fixed valve upper end is matched with seal boss,The lower end of fixed valve is connected to inner tube assembly by inner tube on-off connector,The internal diameter for the limited ring dais that tubing string internal upper part is set is less than the outer diameter of inner tube assembly inner tube under pump.Its is rational in infrastructure, dependable performance, can repeatedly block down-hole pressure, and the workover treatment of actuating oil-pumping unit, oil pipe with pressure can completely cut off pipe external and internal pressure from down-hole plugging pipeline, and energy saving, environmental protection improves safety coefficient, improves production efficiency, reduces cost.

Description

Downhole plugging device for snubbing operation with disconnected plunger tube pump

technical field

The invention relates to the field of tubing operations in an oil field, and belongs to the improvement of the structure of a downhole plugging device for a disconnected plunger tube pump, in particular to an downhole plugging device for a disconnected plunger tube pump without snubbing operation.

Background technique

In high-yield oil wells using tubular pumps, or when lining pipes are used in the upper-stage tubing, in order to ensure production, oil well pumps with a pump diameter larger than the inner diameter of the upper-stage tubing will be used. At this time, the plunger of the oil well pump can only be lowered or put out simultaneously with the pump barrel. A disconnector is installed between the sucker rod and the plunger to achieve docking or disconnection through axial movement.

During the workover process, it is necessary to block the pipeline under the pump to isolate the internal and external pressure sources of the pipeline. Avoid the ejection of downhole medium during construction, causing energy waste, environmental pollution, or safety accidents.

At present, there is no similar product that can meet the above requirements. Generally, well killing fluid is used during workover, which is injected from the tubing to limit the downhole pressure. The operation cycle is long and the cost is high.

Contents of the invention

The purpose of the present invention is to provide a downhole plugging device for unsnubbing operation of a disconnected plunger tube pump. Workover operations can block the pipeline from the downhole, isolate the pressure inside and outside the pipeline, save energy, protect the environment, improve safety factor, increase production efficiency and reduce cost.

The object of the present invention is achieved in the following way: a downhole plugging device for unsnubbing operation of a disconnected plunger tube pump, comprising a sucker rod in the tubing string on the pump connected to the plunger pump, and the tubing on the pump The lower port of the column is connected with the release pipe, and the lower port of the release pipe is connected with the pump cylinder. A sealing boss is arranged at the lower end of the pump cylinder. The upper end of the plunger pump installed in the pump barrel is connected to the sucker rod through the plunger disconnector, and the lower end of the plunger pump is connected to the fixed valve through the fixed valve disconnector. The lower end of the fixed valve is connected to the inner pipe assembly through the inner pipe disconnector, and the inner diameter of the limit ring set on the upper part of the oil pipe string under the pump is smaller than the outer diameter of the inner pipe of the inner pipe assembly.

Working principle of the present invention:

1. When installing the tubing string, put the plugging device in the plugging state, and the plunger and fixed valve assembly release the pipe section in the pump. After the oil pipe string is installed, it can be tested for pressure, and after the sealing performance is verified, the sucker rod string is lowered.

Connect the upper part of the plunger disconnector to the sucker rod string and lower them together.

The sucker rod string brings the plunger assembly, the fixed valve assembly and the inner pipe assembly together, and the plunger disconnector, the fixed valve disconnector and the inner pipe disconnector realize butt joint at the same time.

The sealing surface 1 of the fixed valve cooperates with the sealing surface 2 to seal, and at the same time, the inner tube descends to the open position.

Lift the sucker rod up half a meter here, and then lower it down to open the fixed valve disconnector. You can adjust the anti-shock distance and start pumping oil.

2. During oil production, the plugging device is in the open state, the oil outside the tubing string can enter, the internal and external media can enter and exit through the oil inlet, and oil can be pumped normally;

3. Before workover, lower the sucker rod first, connect the fixed valve disconnector, and then lift it up. The fixed valve passes through the inner tube disconnector and lifts up the inner tube.

When the two sealing rings on the inner pipe are on both sides of the oil inlet of the oil pipe string under the pump, the plugging device is in a closed state, and the inside and outside of the oil pipe string are isolated.

Continue to lift, the inner pipe reaches the limit platform, the disconnector is released, and the fixed valve and plunger go up to the release pipe section at the same time. Lift up the sucker rod again, and release the plunger disconnector.

After the pressure test verifies the tightness, workover operations such as lifting the sucker rod and tubing can be carried out;

Continue to lift the sucker rod, and other parts remain in the pump barrel.

The invention is reasonable in structure and reliable in performance, realizes the workover operation that can block the downhole pressure multiple times, lifts the sucker rod and tubing with pressure, realizes the ability to block the pipeline from the downhole, isolates the pressure inside and outside the pipe, and saves energy. The environment is protected, the safety factor is improved, the production efficiency is improved, and the cost is reduced.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings. Fig. 1 is a schematic structural view of the present invention just in a docking state, Fig. 2 is a structural schematic view of the present invention in an open state, Fig. 3 is a structural schematic view of the present invention's oil production state, and Fig. 4 is a structural view of the present invention in closed state Schematic diagram of the state structure.

Detailed ways

A downhole plugging device for unsnubbing operation of a disconnected plunger tube pump, as shown in Fig. 1, Fig. 2, Fig. 3, and Fig. 4, comprising a sucker rod 4 in the tubing string 1 on the pump connected to The plunger pump 6 is connected with the release pipe 2 on the lower port of the oil pipe column 1 on the pump, and the lower port of the release pipe 2 is connected with the pump cylinder 3, and the lower end of the pump cylinder 3 is provided with a sealing boss 10, and the pump cylinder 3 It is connected with the pump lower tubing string 13, the lower end of the pump lower tubing string 13 is closed, cooperates with the plunger pump 6 installed in the pump barrel 3, and its upper end is connected to the sucker rod 4 through the plunger disconnector 5, and the plunger pump 6 The lower end of the fixed valve 9 is connected to the fixed valve 9 through the fixed valve disconnector 7, the cover of the block 8 on the upper end of the fixed valve 9 is matched with the sealing boss 10, and the lower end of the fixed valve 9 is connected to the inner tube assembly through the inner tube disconnector 11 , the inner diameter of the limit ring platform 12 arranged at the upper part of the oil pipe string 13 under the pump is smaller than the outer diameter of the inner pipe 15 of the inner pipe assembly. The inner diameter of the release pipe 2 is treated with the outer diameter of the plunger pump 6 and the fixed valve 9 . The structure of the inner pipe assembly is that the inner pipe side oil inlet hole 16 is arranged on the pipe wall of the inner pipe 15, and the inner pipe 15 located at the lower part of the inner pipe side oil inlet hole 16 is provided with an inner wall matched with the inner wall of the oil pipe string 13 under the pump. Two sealing rings 17. The plunger disconnector 5 is a spring-loaded disconnector. The fixed valve disconnector 7 is an orbital disconnector. The inner pipe disconnector 11 is a spring-type disconnector or a steel ball-type disconnector.

Claims (7)

1. A downhole plugging device for disconnecting a plunger tube pump for snubbing operation, comprising a sucker rod (4) in the tubing string (1) on the pump connected to a plunger pump (6), its features Yes: The release pipe (2) is connected to the lower port of the oil pipe string (1) on the pump, the lower port of the release pipe (2) is connected to the pump barrel (3), and the lower end of the pump barrel (3) is provided with a seal Boss (10), pump cylinder (3) is connected with the lower pump tubing column (13), the lower end of the pump lower tubing column (13) is closed, cooperates with the plunger pump (6) installed in the pump cylinder (3), its The upper end is connected to the sucker rod (4) through the plunger disconnector (5), the lower end of the plunger pump (6) is connected to the fixed valve (9) through the fixed valve disconnector (7), and the upper end of the fixed valve (9) The cover of the stopper (8) is matched with the sealing boss (10), the lower end of the fixed valve (9) is connected to the inner pipe assembly through the inner pipe disconnector (11), and the inner upper part of the lower oil pipe string (13) of the pump The inner diameter of the set limit ring platform (12) is smaller than the outer diameter of the inner pipe (15) of the inner pipe assembly. 2. A downhole plugging device for unsnubbing operations with disconnected plunger tube pumps according to claim 1, characterized in that: the inner diameter of the release pipe (2) is treated with the plunger pump (6) and the fixed valve ( 9) Outer diameter. 3. A downhole plugging device for unsnubbing operation of a disconnected plunger tube pump according to claim 1, characterized in that: the structure of the inner tube assembly is that the wall of the inner tube (15) is provided with The inner pipe side oil inlet hole (16), the inner pipe (15) located at the lower part of the inner pipe side oil inlet hole (16) is provided with two sealing rings (17) matched with the inner wall of the pump lower oil pipe string (13). 4. A downhole plugging device for snubbing operation with a disconnected plunger tube pump according to claim 1, characterized in that the plunger disconnector (5) is a spring-type disconnector. 5. A downhole plugging device for unsnubbing operation of disconnected plunger tube pump according to claim 1, characterized in that: the fixed valve disconnector (7) is an orbital disconnector. 6. A downhole plugging device for unsnubbing operation of disconnected plunger tube pump according to claim 1, characterized in that: the inner pipe disconnector (11) is a spring disconnector or a steel ball disconnector. 7. A downhole plugging device for unsnubbing operation of a disconnected plunger tube pump according to claim 1, characterized in that: an outer tube side is arranged on the tube wall at the lower part of the tubing string (13) under the pump Oil inlet hole (14).