Underground casing pressure deflation valve and pressure adjusting method of heavy oil well

Abstract

The invention provides an underground casing pressure deflation valve and a pressure adjusting method of a heavy oil well, and belongs to the technical field of oil development. The upper portion of the deflation valve is provided with inner threads used for being connected with an oil tube with the diameter of 88.9 mm, plugs are connected with air inlet holes, the plugs are provided with screw threads so as to be convenient to connect and detach, four balls can be replace and are connected with the insides of the air inlet holes, the diameter of each steel ball is 6 mm, the number of the steel balls is four, the diameter of each air inlet hole is 6 mm, the number of the air inlet holes is four, the upper portion of the deflation valve is provided with a round 45-degree inclined face, the lower portion of the deflation valve is provided with a round 45-degree inclined face and tube threads, and the lower portion of the deflation valve is connected with the oil tube of the diameter of 88.9 mm. By means of application tests of the underground casing pressure deflation valve in heavy oil production, influences of casing pressure on heavy oil production are fully eliminated, labor intensity of operators is reduced, and the deflation valve is low in cost and remarkable in effect and has good popularization prospects.

Description

technical field [0001] The invention relates to a downhole casing pressure release valve and a pressure regulating method of a heavy oil horizontal well, belonging to the technical field of petroleum development. Background technique [0002] In the process of oil field development, with the production of oil and gas, a large amount of casing gas will be produced in the casing of heavy oil horizontal well. If the gas is not discharged in time, it will affect the normal operation of the deep well pump. The associated casing gas in the well is decompressed. A lot of work has been added. During the development of thin oil fields, wellhead constant pressure relief valves are widely used to automatically discharge the gas in the casing. The constant pressure release valve is used in the development of heavy oil, causing the valve core to be stuck to death by heavy oil, and the constant pressure release valve cannot be opened normally. [0003] In the field management of the oi...

AI Technical Summary

Problems solved by technology

[0004] (1) The casing pressure is high, the dynamic liquid level in the casing will drop, and the submergence of the pump will decrease. At the same time, the oil and gas mixture will enter the pump, and the volume of oil entering the pump will decrease, which will affect the opening and closing of the valve, thus reduce pump efficiency

[0005] (2) When the operator releases the casing pressure at the wellhead, he slowly opens the casing valve to release the pressure. During the process, if the valve is not controlled properly, the casing will spray oil and even cause large-scale pollution

[0006] (3) The operator does not control the valve well and conducts sudden spraying, which will cause serious sand production in the formation and cause damage to the formation

[0007] (4) Improper operation when pressing into the casing, the noise will exceed the noise standard of industrial enterprises by 70 decibels, which will affect the health of the operators

[0008] (5) Sudden release of pressure will cause local toxic and harmful gas content to rise, forming a safety hazard

[0009] (6) If the casing pressure is too high, the oil well will produce oil intermittently or even lead to no production of the oil well, so that the cursor and the packing will be dry-grinded, resulting in oil leakage from the packing and shortening the service life of the packing

Images