Productivity Appraising Method Research Of The Xujiaweizi Deep Special Lithology Gas Reservoir

Xujiaweizi deep special lithology gas reservoir(most is volcanic gas reservoir) is typical of big difference of permeability, severity inhomogeneity, complexity distribution of gas/water, pore structure complexity, rock type peculiar, lithology complexity, so we can conclude that it has special characteristic and difficulty in production quite different from normal gas reservoir. Nowadays, the number of volcanic gas reservoir witch has been found in the world is numbered, can not come into being some method and experience used for reference, so we must know volcanic gas reservoir more, develop gas well productivity and performance description of the reservoir research, also offer performance prediction of Xujiaweizi volcanic gas reservoir abundance technical foundation and sort the favorable development, which establish excellent foundation for the expedition of production, and the wise adoption of development project.At present, gas reservoir productivity appraising main depend on stable well test and unstable well test, gas well absolute open flow potential, productivity equation, well control dynamic reserves, permeability, stratum quotiety, skin quotiety, and so forth .Thus, we can ascertain reasonable output of gas well, thereby get the optimal productivity of gas well and obtain the best economic benefit, at the same time, make the gas well get better stable productivity, and protect the reservoir destroying. Because Xujiaweizi deep special lithology gas reservoir is typical of big difference of permeability and severity inhomogeneity, formation pressure recovering may nend extraordinary long time, we can not carry out ideal stablized well testing, only can carry out non-stablized well testing, at the moment, we adopt non-stablized well testing in the productivity appraising of Xujiaweizi deep gas reservoir is modified isochronal testing generally. At first, this thesis discusses the theory of gas well productivity analysis; then, introduces the method of gas well productivity analysis detaildely. On the foundation of above, the production test data and gas test data of some gas wells in Shengping development area and Xingcheng development area which locate Xujiaweizi region had been made well test interpretation, obtained a lot of gas well interpretation data, thereby we get a comprehensive and depthy recognition of Xujiaweizi deep special lithology gas reservoir, and develop relative effective productivity appraising method of Xujiaweizi deep special lithology gas reservoir.