Study On Production Testing For Gas Wells In Xujiaweizi Deep Reservoirs

At present , Xushen Volcanic Gas Reservoir is on the exploration and development stage. Xujiaweizi deep special lithology gas reservoir(most is volcanic gas reservoir) is typical of tight reservoir. It has character of serious nonhomogeneity, big difference of permeability, complexity distribution of gas and water, lithologic complexity severity, high temperature and high pressure, great difference of single well productivity. So we can conclude that special characteristic and difficulty in production is quite different from normal gas reservoir. Nowadays, the number of volcanic gas reservoir which has been found in the world is numbered, there is no gas well testing method and experience for reference.There are four parts in this paper. First, gas well testing work system optimization, through the theory study and calculating, analysis continuous liquid discharge terminal flowing quantity, solving the optimizing problem in well testing of gas &water well and low production well. Through using three graphs in single flowing well curve ,and nodding analysis method, confirm the reasonable well testing working system, solving the oil mouth optimizing problem and production formula building problem in well testing. In the study of liquid discharge by shut off- open well, building mutative skin coefficient seepage math model and application method by gas seepage theory, base on the well bore pressure data, stratum physics character and forepart production data, explaining mutative skin coefficient and estimating effect in time, offering foundation for fieldwork decision-making. Second, for the low porosity and permeability, research the affect of absolute open flows production in imitated state in well testing process . Pointing out the applicability of conventional gas well productivity analysis, deducing transient production rate binomial deliverability equation by pressure draw down stack method, improving calculate precision of absolute open flow production. Third, build the primary well testing method of production testing in Xujiaweizi deep gas reservoir, choosing method of parameter forecast in production test of gas production testing.Through the research, solving the illogicality of geologic purpose and filed working, buildup liquid discharge and well testing method after fracturing, improving testing efficiency, analyzing and evaluating gas well production exactly.