Study On Single Point Pressurization Of Difficult Wells In West Sichuan Gas Field

Built capacity block of shallow gas reservoir in western Sichuan gas field has fallen into later periods of gas reservoir development, most gas wells of Tight gas reservoir in western Sichuan going into the low pressure production stage, for these gas wells has applied techniques of high and low pressure pipeline transmission and centralized supercharging. But in the current centralized charging patterns still exists the following problems:(1)Concentrated charging technoque can’t cover all low pressure gas well, Remote Wells which can’t be spreaded to are still seriously affected by the pipeline pressure;(2)To old booster field, the compressor meeting minimum inspiratory pressure, wellhead abandonment pressure is0.5MPa, which still has potential to further reducing the pressure, and at present concentrated compressor set can not fit.There are three kinds of solutions to solve the problem of low pressure gas out transportation both at home and abroad, According to analyzing characteristics and situation of the gas well productionn in the western Sichuan gas field, comes up with single point of pressurization mode. Applying node system analysis the production potential of pressurization mining and the lower value of abandonment pressure of reservior, the increasing degree of gas recovery, deepening understanding of single point pressurization potential. According to the principle of selecting well, pick out required pressurization wells.By matching research then define test parameters in working condition of compressor set and pilot test,and select gas-driven screw compressor which is suitable for lower gas wells in west Sichuan.Finally completed field test on20well groups of95wells, analysis production s of test Wells before and after pressurization, deepening understanding the single-point characteristics of pressurization process, and effectively solve the transfer difficulties in these wells. Based on the evaluation of test result, analysis the factors influencing the supercharging effect, then further improve the principles of selecting wells and put forward opinions and suggestions,form matching technology for single point of pressurization mode,so be able to offer references for pressurization exploitation in other low pressure gas field.