Abstract:  Gas lift is one of the most effective drainage and gas recovery technologies in gas field, and gas lift valve is the core tool of gas lift technology. In order to solve the problem that the safety coefficient of nitride 25MPa gas lift valve is low in some high-pressure deep well gas lift at present, the nitride35MPa gas lift valve has been successfully developed by optimizing the design of the bellows of the gas lift valve, chamber, selecting the best material, improved processing technology, the finite element stress analysis and a lot of experiments. After applying the internal pressure of 36 ~ 38MPa and the external pressure of 90 ~ 93MPa to the chamber of the air lift valve, it is in perfect condition, and the absolute error between the opening pressure of the air lift valve and the theoretical value at different temperatures is less than 0. 9mpa and the relative error is less than 8% . The field trail use of the new valve is in good agreement with the process design parameters, which indicates that the opening pressure of the valve is close to the theoretical opening pressure and is in good condition in the well. The successful development of the high pressure gas lift valve expands the scope of gas lift technology and provides technical support for gas lift drainage and gas recovery in such high pressure deep gas wells as in Longgang and Longwangmiao block.

Key words:  , gas lift valve, Nitrogen filling pressure, bellows, chambers, temperature characteristics, drainage gass recovery

摘要：

关键词:  , 气举阀, 充氮压力, 波纹管, 腔室, 温度特性, 排水采气