Downhole pressure regulator

Abstract

The invention discloses a downhole pressure regulator. The downhole pressure regulator comprises a shell, the shell is internally provided with an adjusting cavity, an air inlet cavity and a transition cavity, an airbag is installed in the adjusting cavity, the adjusting cavity is communicated with the air inlet cavity through air holes, the air inlet cavity is communicated with the transition cavity through small holes, communication holes are formed in the two sides of the air inlet cavity, a top rod is arranged in the middle of the air inlet cavity, a return spring sleeves a vertical section of the top rod, the top of the vertical section of the top rod penetrates through the air holes and afterwards extends upwards to be connected with the airbag, a first sphere is arranged at the bottom of a horizontal section of the top rod, a spacer is arranged on the inner wall of the air inlet cavity, and sealing holes which are coaxial with the small holes are formed in the middle of the spacer. Aiming at the problem in the prior art that during gas-lift oil production, the adjustment of high pressure air flow is inaccurate and the oil recovery efficiency is lowered, different cavities are formed to jointly control the high pressure air flow, so that the flow of the high pressure air flow among casing pipes and oil pipes is smoother, the adjustment is more accurate and then the efficiency of gas-lift oil production is 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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