关键词: 油井, 套管, 放气阀, 劳动强度, 开井时率

Abstract: A series of problems existed in use of old-style casing pressure release valve. For example, replacement of the valve requires welding service, long time for shutdown of well and high labor intensity, leading to low efficiency. Casing pressure release valve has to be abandoned once valve seat or valve body is damaged. A new-type casing pressure release valve is developed without changing raw materials and work principle of the old-style valve. It is composed of valve seat, valve body, valve ball, spring and plug and equipped with dedicated replacement tools. The valve body is a sealed one-body after transformation, eliminating environmental pollution caused by oil and gas leakage from the joint between valve body and valve seat. Installation and replacement require no welding service. Replacement of valve seat takes a person only 15 minutes with the help of dedicated tools. Used in various oil production plants of Turpan-Hami Oilfield, it lowers labor intensity, improves work efficiency, extends operating rate and reduces service cost.

Key words: oil well, casing, release valve, labor intensity, operating rate