Plunger for gas lift

Abstract

The invention discloses a plunger for air lifting. The plunger for air lifting comprises a hollow tubular base cylinder, an upper cover plate, a lower cover plate, a corrugated pipe and a movable column. The base cylinder is provided with an upper end opening and a lower end opening which are back to each other; air flow holes are formed in the cylinder wall of the base cylinder; and the base cylinder is internally filled with preset air. The upper cover plate is arranged on the upper end opening of the base cylinder. The lower cover plate is arranged on the lower end opening of the base cylinder, and an opening is formed in the lower cover plate. The base cylinder is sleeved with the corrugated pipe, and the two ends of the corrugated pipe are in sealing connection with the upper cover plate and the lower cover plate correspondingly. The movable column penetrates through the opening and is slidably arranged in the base cylinder. When the movable column moves close to the upper cover plate, the preset air is compressed, and meanwhile the radial size of the corrugated pipe is increased. According to the plunger for air lifting, the defects of an existing plunger can be overcome, during using, the sealing effect is good, the falling speed is high, the diameter of an oil tube can be changed through deformation of the plunger, the overall working efficiency is high, and applicability is wide.

Description

Technical field [0001] The invention relates to the technical field of oil and gas extraction by plunger lift for oil and gas wells, in particular to a plunger for gas lift. Background technique [0002] As a more conventional artificial lifting method, the plunger lifting technology has been applied to oil and gas wells in more and more oil and gas fields. During the lifting process, the plunger is a solid interface between the liquid and the gas, reducing the slip loss between the liquid and the gas, and greatly improving the lifting efficiency. [0003] However, in the process of application, although the conventional gasketed plunger can better solve the sealing problem and can adapt to different tubing sizes, it has a large windward surface during the fall process and severe friction with the tubing wall. , Resulting in high falling resistance and slow falling speed, sometimes unable to reach the bottom of the well in a predetermined time. Usually it is necessary to lower the...

AI Technical Summary

Problems solved by technology

However, the plunger itself does not have the function of changing the diameter. When the running oil pipe changes its diameter due to external force, the plunger will be stuck and cannot run.

[0007] In summary, it is necessary to provide a plunger for gas lift, which can overcome the defects in the prior art: slow plunger falling speed, poor sealing effect of the plunger, and jamming of the plunger at the oil pipe diameter reduction.

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