Downhole pressure regulator

Abstract

The invention discloses a downhole pressure regulator which comprises a shell. The shell is internally provided with an adjusting cavity, an air inlet cavity and a transition cavity. The adjusting cavity is internally provided with an air bag and communicated with the air inlet cavity through a ventilation hole, the air inlet cavity is communicated with the transition cavity through a small hole, communication holes are formed in the two sides of the air inlet cavity, an ejector rod is arranged in the middle of the air inlet cavity, a vertical section of the ejector rod is sleeved with a return spring, the top of the vertical section of the ejector rod penetrates through the ventilation hole and then extends upwards to be connected with the air bag, a first ball is arranged at the bottom of a horizontal section of the ejector rod, a gasket is arranged on the inner wall of the air inlet cavity, and the middle of the gasket is provided with a sealing hole coaxial with the small hole. In order to solve the problem that during gas-lift oil production in the prior art, adjustment of high-pressure gas flow is not accurate and accordingly oil recovery efficiency is reduced, different cavities are arranged for linkage control over the high-pressure gas flow, so that flow of the high-pressure gas flow between a casing pipe and an oil pipe is smoother, adjustment is more precise, and accordingly gas-lift oil production efficiency is further improved.

Description

technical field [0001] The invention relates to the field of oil exploitation, in particular to a downhole pressure regulator. Background technique [0002] The use of air pressure lift is the most economical oil recovery method in the modern oil production process. Gas lift can not be limited by the depth of the oil well. The injected gas can go deep into the liquid through the gas lift valves at all levels from top to bottom, so that the bottom of the tubing The weight of the liquid becomes lighter and reduces the back pressure on the oil layer, thus ensuring the smooth and continuous production of the oil well. However, during the use of the existing gas lift valve, the sphere continuously reciprocates under the strong impetus of the high-pressure airflow, that is, the sphere and the ball seat collide with each other uninterruptedly, resulting in a decrease in the airtightness of the sphere. The adjustment flexibility of the gas lift valve to the oil in the tubing is red...

AI Technical Summary

Problems solved by technology

Aiming at the problem that the inaccurate adjustment of high-pressure airflow leads to the reduction of oil production efficiency in gas lift production in the prior art, the inventors set up different cavities to carry out linkage control on high-pressure airflow, so that the high-pressure airflow is between the casing and the oil pipe. The circulation is smoother, the adjustment is more precise, and the efficiency of gas lift oil recovery is improved; when in use, multiple shells are set in the annular part of the casing and the tubing, at this time the transition chamber is connected with the inside of the tubing, and the gas inlet chamber is connected to the inside of the tubing. The transition chamber is sealed off, and the return spring is in a stretched state. A large amount of high-pressure airflow is injected into the casing. The high-pressure airflow enters the air intake chamber through the communication hole. When the air intake chamber is filled, the high-pressure airflow passes through the ventilation The hole enters the adjustment chamber, and the space in the adjustment chamber is filled by the expanded air bag. The air bag is deformed and its volume is reduced by the injection of high-pressure airflow to the lower pressure of the ejector rod. The pressure decreases, and under the return force of the return spring, the ejector rod moves up, and at the same time drives the first ball to cancel the seal on the small hole, and the high-pressure airflow in the intake chamber is released through the small hole to quickly pass through the transition chamber After entering the oil pipe, the high-pressure airflow partially offsets the gravity of the oil in the oil pipe, and the lift required for the oil in the oil pipe to rise is greatly reduced, which speeds up the pumping efficiency of the oil in the oil pipe

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