Safety type lifting high-temperature gas injection valve for oil well

Abstract

The invention relates to the technical field of oil well oil extraction, in particular to a safety type lifting high-temperature gas injection valve for an oil well, which comprises an outer pipe, a movable pipe and a gas injection pipe fitting, the movable pipe is fixedly sleeved on the outer side of the gas injection pipe fitting, the outer pipe is sleeved on the outer side of the movable pipe, and the movable pipe is driven by a driving device and does linear motion on the outer pipe; the gas injection pipe fitting is formed by splicing a plurality of groups of piston cylinders, a connecting ring sleeves the outer side between every two adjacent groups of piston cylinders, a piston is arranged in each group of piston cylinders, a push rod is fixedly inserted in the middle of each piston, a reciprocating motion mechanism acting on the push rods is further arranged in the movable pipe, and through holes are formed in the lower ends of the side walls of the piston cylinders; a gas injection assembly is arranged in each through hole. According to the invention, the gas injection pipeline can be effectively lengthened or shortened according to actual requirements, so that the device is more flexible and efficient to use; and gas injection can be carried out on multiple points in the vertical direction of the oil well, and the uniformity of high-temperature gas injection can be improved.

Description

technical field [0001] The invention relates to the technical field of oil well production, in particular to a safety-type lifting high-temperature gas injection valve for oil wells. Background technique [0002] Most of the oil and gas fields that have been developed in my country have entered the middle and late stages. Although a series of measures such as water injection have achieved remarkable results, in recent years, the development of water injection in low-permeability oilfields has reflected high water injection pressure, high cost, low permeability, and low productivity. For a series of problems, a considerable part of crude oil cannot be extracted underground, and the extraction of remaining oil and complex oil and gas reservoirs is particularly important. In order to improve oil recovery, oil recovery technologies such as gas injection have been increasingly applied. Because gas has the functions of easy flow, reduced viscosity, volume expansion, and reduced in...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, due to the influence of various factors, such as the nature of the reservoir, geological pressure, and the direction of the wellbore, etc., the general steam injection method used in the development of heavy oil in vertical wells has many defects, such as vertical section For problems such as low production uniformity, it is necessary to upgrade the steam injection method to ensure production uniformity and oil recovery efficiency, which plays an important role in the development of oilfields and the effect of energy recovery;

Images