DRAINAGE GAS RECOVERY TECHNOLOGY TEST AND EFFECT ANALYSIS IN NANBAXIAN GAS FIELD
Nanbaxian Gas Field was brought into production in 2001,annual natural gas production capacity of 2.5×108 m3,the single well water rate of 669 m3,the average single well gas production rate of 2.1×104 m3 /d were obtained,water/gas ratio was 0.04 m3/104 m3.At present,there are 32 production gas wells,average single well gas production rate is 2.09×104 m3 /d.With the extension of the development cycle,gas well water out became more and more serious in the Nanbaxian gas field,wellhead pressure has reduced,many gas wells couldn't be produced.In order to resolve the problem,the downhole throttling,turbine drainage and foam drainage technology were applied in Nanbaxian gas field,and the field application effects were analyzed.Based on the actual flow velocity and corresponding the minimum critical liquid carrying flow rate of eddy current tool,the parameters of eddy current tool was optimized and the corresponding positions of the eddy current tools were designed.Using eddy current drainage gas recovery technology changed the shaft gas liquid two phase flow pattern,reduced the critical liquid carrying flow rate.It provided a basis for the popularization and application of turbine drainage gas recovery technology.