| At present, thewater drive gas reservoir ingas reservoir exploration accounts for about 65%, due to the influence of water invasion in the gas wells, the dynamic reserves and gas reservoir production are reduced drastically, which directly affect the development of gas reservoirs.Based on GF carboniferous gas reservoir as the research object, made a research on influence of water invasion, early water intrusion identification, water invasion calculation, gas reservoir development.lt is significant for us to carry out the comprehensive treatment of water invasion problem, timely adjust the development scheme of gas reservoir, prolong the time of dry gas production and stable gas production,and finally improve the ultimate recovery rate of gas reservoir.Firstly Paper introduces the gas reservoir exploration and development present situation and the analysis of dynamic characteristics, the connectivity between Wells, gas well production capacity current situation, the reserves producing situation, water production characteristics of gas reservoir.Secondlyby adopting the combination of theoretical basis and case analysis form,the seepage mechanism of water drive gas reservoir and water seal mechanism as a starting point, analyzes the influencing factors of water drive gas reservoir water invasion. And then carding production water Wells distribution and production characteristics, Uses the production curve method, the apparent geologic reserves method, optimization method of three different methods for quantitative calculation of gas reservoir water influx, and the three methods were compared.Water activity coefficient was determined by water displacement coefficient and water drive curve method. The effects of water intrusion on development of gas reservoirs are expounded from the influence of reserve use degree and productivity equation.Finally the drainage scheme is optimized by numerical simulation, and the effect of single well drainage measures is analyzed.Through the research of this paper, the following main achievements have been made:(1) Feng ① upper fault Carboniferous gas reservoir each well is connected, The connectivity of the South and North blocks is different, and the connectivity of the South Zone is worse than that of the North Zone.(2)The characteristics of water invasion in the gas reservoirs are water intrusion at both ends, and local water intrusion in the central region. The northern end was affected by water invasion, the southern end of little effect.(3) The water intrusion of the gas reservoirs and the replacement coefficient of the water invasion are calculated by using the production indicator curve method, the geological reserve method and the optimization method. The water intrusion of the GFCarboniferous gas reservoir is 1000×104m3, Gas reservoirs are currently active gas reservoirs.(4) The remaining reserves in the north of the gas reservoir are larger than that in the southern area, especially in the well F7 only 23.9%. In addition, the reserves of the F3 and F8 wells in the southern outlet well are low.(5) Water invasion leads to the decrease of the utilization degree of the well by about 20%～39%. The time of water injection in the gas well determines the decrease of the utilization degree of gas well reserves. There is a close relationship between them.(6) For the effluent gas well, the single discharge resurrection process can not meet the application in the field, and it should take multiple measures simultaneously. In the three reservoir wells to implement the drainage of water control measures, is expected to nearly gas recovery of 0.97×108m3,1.54% increase in recovery. |
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