Self-operated water draining gas recovering plunger with variable diameter

Abstract

The invention discloses a self-operated water draining gas recovering plunger with a variable diameter. Sealing rubber cylinders are arranged at the upper end of a plunger body; A sealing rubber cylinders are fixed by upper end covers; the upper end covers are connected with the plunger body; the upper end covers are provided with four liquid inlet holes; sealing rubber cylinders at the lower endof the plunger body are fixed by a lower half cylinder of the plunger; the lower half cylinder of the plunger is connected with the plunger body; four air inlet holes are formed in the upper end of the lower half cylinder of the plunger; a sliding sleeve is arranged in an inner cavity of the plunger body; four sliding sleeve liquid inlet holes are uniformly formed in a channel in the sliding sleeve in the circumferential direction; four plunger liquid inlet holes are uniformly formed in the lower half cylinder of the plunger in the circumferential direction, and a spring is arranged in an inner cavity of the lower half cylinder of the plunger; and a spring base is connected with the lower half cylinder of the plunger by threads. The plunger adopts the form of double-sealing and pressure sliding sleeve to achieve the variable diameter of a plunger sealing structure, energy of a gas well is fully used, liquid leakage during plunger rising process is greatly reduced, plunger descending time is reduced, change of one-time period liquid lifting quantity is achieved, and continuous production without well closing is achieved.

Description

technical field [0001] The invention belongs to an underground drainage and gas production tool in the field of petroleum and natural gas exploitation, and in particular relates to a variable-diameter self-powered drainage and gas production plunger. Background technique [0002] The plunger gas lift drainage gas recovery method is a widely used intermittent drainage gas recovery measure. The plunger gas lift method can reduce bottomhole fluid accumulation and prolong the production time of gas wells. At the same time, the plunger gas lift can also be used in oil and gas wells that are prone to wax and scale, eliminating the need for cleaning wax and scale. However, there are still some problems, such as discontinuous production, long shut-in time, and large fluid loss during ascent. [0003] At present, the commonly used plungers for drainage and gas production include solid plungers, brush plungers, liner plungers and quick plungers. The common disadvantage of them is th...

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Problems solved by technology

[0003] At present, the commonly used plungers for drainage and gas production include solid plungers, brush plungers, liner plungers and quick plungers. The common disadvantage of them is that they cannot control the amount of liquid lifted in a single working cycle of the plunger and the lifting liquid. Serious omission

When there is too much liquid accumulation, the plunger tool cannot reach the wellhead smoothly, and the process fails; when the liquid accumulation is small, the formation pressure recovery time is short, the upward speed of the plunger is slow, the liquid leakage is serious during the lifting process, and the plunger discharges Liquid effect is poor

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