Since this year, the northwest oilfield engineering technology ( technology) Institute in tahe heavy oil Wells, gas injection string used in high pressure gas lift valve, succeeded in several rounds of gas injection and the normal production of heavy oil well, cut down the cost of workover, amounting to 15 million yuan to produce economic benefits of 12 million yuan. Well require the use of high pressure gas sealing when the gas injection string matching gas seal packer, avoid in the process of gas injection string leakage safety accidents, etc. At present, the thick oil in tahe oil field gas injection site with mixed rare valve, doped rare valve is a valve, gas seal structure is difficult to achieve closed after opening, it is hard to meet the well gas injection and high pressure gas seal requirements, rounds late do not doped rare production at the same time. In order to solve this problem, oil engineering researchers through extensive research, has established in the gas injection string matching of high pressure gas lift Industrial Valves. Technicians will conventional gas lift valve structure improvement for the high pressure gas seal structure, the gas seal pressure 70 million mpa, satisfies the requirement of gas injection, at the same time, the threaded connection thread is improved for gas seal special clasp, realize the tool string gas tightness, improve the gas lift valve opening and closing pressure, to ensure the gas lift valve in full close state when the gas injection and production of automatic open state, achieve the function of gas injection after mixing thin. High pressure gas lift valve has three major innovations, one is by improving and perfecting the structure of conventional gas lift valve satisfies the requirement of high pressure gas injection and mixing lean production; The second is the gas lift valve valve hole size from 3. 2 mm to 8 mm, realizes the fixed string doped thin heavy oil gas injector production; 3 it is through the two levels of gas lift valve design, reduce the risk of valve hole jam, increase the flow area. Improvement of gas lift valve applied to heavy oil gas injector in field test, the process of gas injection without dynamic string workover operations, use of gas lift valve valve hole after gas injection from the annulus mixed rare production, at the same time satisfy the heavy oil Wells of high pressure gas injection and mixing lean production requirements. So far, there are 15 heavy oil Wells in tahe oilfield gas injection in the application of the high pressure gas lift valve, gas injection is implemented with mixed lean production.
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