Position control part and plunger

Abstract

The invention relates to the technical field of natural gas and oil exploitation, and discloses a position control part and a plunger. When the plunger provided by the embodiment of the invention needs to move downwards, the position control part moves from the expanded position to the retracted position, so that the sealing spacers retract inwards to the position close to the inner position in radial direction, at this moment the maximum outer diameter of the plunger is smaller than the inner diameter of an oil-gas well shaft, friction between the packers and the inner wall of the well shaftis eliminated, a space for fluid to pass through is formed between the plunger and the inner wall of the well shaft, so that downward resistance of the plunger is greatly reduced. In addition, the position control part controls the radial positions of the sealing spacers through position control surfaces on fins, so that flow spaces allowing fluid to pass through can be formed between adjacent fins. When the plunger allows the fluid to pass through a core tube when moving downwards, flow area of the core tube can be increased due to the existence of the flow spaces, so that downward resistanceof the plunger is reduced to a greater extent, and the plunger can move downwards to the bottom of the well more rapidly.

Description

technical field [0001] The invention relates to the technical field of natural gas and oil exploitation, in particular to a position control component and a plunger. Background technique [0002] In oil and gas wells, the problem is to drain the accumulated fluid at the bottom of the well, and a plunger is usually used. The plunger has a plurality of packing sheets arranged in the circumferential direction, and these packing sheets are tightly attached to the inner wall of the well of the oil and gas well under the action of the elastic member to form a seal. In the open well state, the plunger goes up and lifts the accumulated fluid above it to be discharged out of the oil and gas well. In the shut-in state, the plunger goes down to the bottom of the well. Reciprocating in this way, the continuous lifting of the bottom fluid is realized. A big problem with the traditional plunger is that under the action of the friction between the packing plate and the inner wall of the...

AI Technical Summary

Problems solved by technology

However, oil and gas wells cannot produce in the well shut-in state, which greatly reduces the production efficiency of oil and gas wells

Images