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Self-buffering plunger and gas lift fluid flowing production method and application

A plunger, self-contained technology, used in earth-moving drilling, liquid fuel engines, components of pumping devices for elastic fluids, etc., can solve problems such as pollution, poor drainage effect, and heavy workload.

Active Publication Date: 2017-03-15
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems that the existing foam drainage process for horizontal wells has the disadvantages of pollution, high cost, heavy workload, and poor drainage effect

Method used

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  • Self-buffering plunger and gas lift fluid flowing production method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In order to solve the problems of pollution, high cost, large workload, and poor drainage effect caused by traditional horizontal wells using foam drainage technology, this embodiment provides figure 1 The shown plunger with its own buffer includes a plunger body 1 and a guide rod 3. The plunger body 1 is a hollow cavity. The hollow cavity is provided with a buffer spring 4, and one end of the guide rod 3 extends into the hollow cavity. , The other end extends out of the plunger body 1 and a guide head 5 is sleeved on this end. The top of the plunger body 1 is the plunger fishing head 2; the guide rod 3 is sleeved with a retaining ring 8, which is located on the column At the bottom end of the inner wall of the plug body 1, the retaining ring 8 and the plunger body 1 are connected by a spring cylindrical pin-6.

[0020] The working process of the plunger provided in this embodiment is:

[0021] In the shut-in state, the plunger with buffer is lowered into a horizontal well ...

Embodiment 2

[0025] On the basis of Example 1, in order to reduce the weight of the entire plunger and to discharge the sand contained in the bottom hole liquid, the guide rod 3 has a hollow structure. In order to fix the position of the buffer spring 4 and prevent the buffer spring 4 from slipping off, one end of the guide rod 3 extending into the hollow cavity of the plunger body 1 is provided with a step. The guide head 5 and the guide rod 3 are connected by a spring cylindrical pin 7 or threaded, and the spring cylindrical pin 7 serves to fix the guide head 5. In order to achieve the shut-in state, the plunger body 1 can descend under its own weight and finally stop running, the outer diameters of the plunger body 1 and the guide head 5 are both larger than the inner diameter of the horizontal section of the horizontal well. In order to make the plunger body 1 fall smoothly, the guide head 5 is threadedly connected to the bottom end of the guide rod 3, and the guide head 5 is rounded.

Embodiment 3

[0027] This embodiment provides a gas lift drainage production method with a buffered plunger. When the well is shut in, the buffered plunger is placed into a horizontal well (or highly deviated well and vertical well). The plunger with buffer descends as a whole and reaches the position of the reducing joint of the horizontal well. The guide head 5 of the plunger stops moving when it encounters resistance. The plunger body 1 continues to descend under the action of inertia, the buffer spring 4 is compressed, and the plunger body 1 stops descending ; Then the well is opened, the plunger moves upward under the action of formation gas or injected gas, and at the same time, the bottom hole liquid is lifted to the well head, so that a cycle of gas lift and liquid discharge is completed and the next cycle is started. The horizontal gas well has its own buffered plunger gas lift to discharge liquid and gas production safely. This device has been successfully put into operation in Cha...

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Abstract

The invention provides a self-buffering plunger. A spring is arranged in the plunger, which can achieve a self-buffering function of the plunger and can replace the conventional downhole buffers; a bottom guide rod and a baffle ring can fix a position of the spring, prevent the spring from sliding and falling off, and can support the spring; a guide head plays a role in guiding in falling of the plunger and can support the plunger body in a well bottom, and the guide rod is of a hollow structure; spring cylindrical pins can fix the baffle ring and the guide head. The plunger is mainly used for highly-deviated wells and horizontal wells, can overcome the problem that the conventional horizontal wells cause pollution, are high in cost, are large in workload, and are poor in fluid flowing effect due to the foam water drainage technology, can achieve the fact that horizontal gas wells can perform fluid flowing and gas production by using the plunger gas lift technology, can solve the difficult problem of fluid flowing and gas production of more than 1200 horizontal gas wells in a Changqing gas field, and can be used for the highly-deviated wells and vertical shafts, and can simplify downhole tools.

Description

Technical field [0001] The invention belongs to the technical field of gas field gas production, and in particular relates to a production method and application of a plunger with a buffer and a gas lift drainage liquid. Background technique [0002] The plunger gas lift process uses the energy of the gas well to discharge the liquid out of the wellbore. The plunger acts as a mechanical interface between gas and liquid to prevent the gas from going up and the liquid to fall, reducing the effect of liquid slippage and increasing the efficiency of intermittent lifting. Plunger gas lift is a simple and efficient method of liquid discharge and gas recovery. It is a special form of intermittent gas lift. The plunger acts as a solid sealing interface to separate the lifted gas from the lifted liquid and reduce gas. Channeling and liquid fall back to improve the efficiency of lifting gas. The energy of plunger gas lift mainly comes from the formation, but when the formation gas energy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B53/14E21B43/00
CPCE21B43/122F04B53/14
Inventor 韩强辉田伟杨亚聪吕伟
Owner PETROCHINA CO LTD
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