Study Of Well Test Analysis Method Of Cave-Fissure-Pore Triple Medium Reservoir

The major carbonate of Sichuan basin is fractured- porosity reservoirs, which fractures are the main flow channels and porosity is the dominant save space. Part of the static or dynamic data in Jialingjiang group and Changxing biohermal gas formation present triple-porosity characters which is different from fractured-porosity reservoirs.However,the filtration theory study of caved-fractured-porosity triple medium behaviors is so pure and there isn't a systematic cognition of flow dynamic rules.Due to the lack of quantification pertinence analytic method, the further understanding of this kind of gas development dynamic performance is seriously restricted which also influences the efficient development.Laying the entry point on Jialingjiang group and Changxing biohermal gas formation and with the purpose of exploration of specificity of triple medium formation, we analysis the geologic, drilling, logging and testing curves of developed field of the whole Sichuan basin, carry out the influent description theory study of caved-fractured-porosity continuous medium, and obtain abundant research achievements of a systematic recognition of the characteristics of caved-fractured-porosity reservoirs.1.Scan co relational research achievements domestic and overseas, grasp the main ideas of triple-medium gas reservoir well test model, select nine typical field wells as triple-medium dynamic analysis, finally draw a conclusion of triple-medium reservoir dynamic characteristics recognition evidence based on the research of static and dynamic performance of gas reservoir.2.Establish triporate-uniphase flow parallel cross flow,triporate-uniphase flow -step by step cross flow,triporate-biphase flow,triple-medium composite model(triple medium both outside and inside; triple medium inside and homogeneity medium outside; triple medium inside and double medium outside), triple medium partly perforated model, triple medium bilayer model(interlamination cross flow or not), triple medium-three tiers model and triple medium isolated cave physical model.3.Launch the method research of triporate-uniphase flow-parallel cross flow,triporate-uniphase flow -step by step cross flow,triporate-biphase flow, triple-medium composite model(triple medium both outside and inside; triple medium inside and homogeneity medium outside; triple medium inside and double medium outside), triple medium partly perforated model, triple medium bilayer model(interlamination cross flow or not), triple medium- three tiers model and triple medium isolated cave physical model, and also ultimate analysis of the variance law of bottom hole flow pressure.4.Carry out the research on triporate-uniphase flow-parallel cross flow,triporate-uniphase flow -step by step cross flow and triporate-biphase flow production mathematical model under which bottom hole flow pressure is constant. Analyze the productivity variance rules. 5.Have conducted the triple-medium reservoir numerical well test exploratory research, gave the method of the triporate-uniphase flow-parallel cross flow under constant output mathematical model with difference method, we accomplished triple-medium reservoir well test data interpretation of selected nine typical wells based on large numbers of data analysis.The results can better solve the core technology problem exposed to the well test analysis and productivity evaluation effort of caved-fractured-porosity reservoir in Sichuan basin; also provide key means to the development dynamic analysis of Jialingjiang group and Changxing biohermal gas formation in Sichuan basin and even efficiently development of caved-fractured-porosity gas reservoir nationwide.