Southwest Petroleum University

Nutao Wang

Chengyang Zhang

Yue Cao

Hang Li

Xiandong Jiang

A stress sensitivity analysis method for a fractured gas reservoir includes: S1, calculating a material balance quasi-time; S2, calculating a normalized production; S3, calculating a single well controlled reserve; S4, analyzing and judging a stress sensitivity. Based on the normalized quasi-pressure and quasi-time, the gas well test analysis is carried out, and the stress sensitivity of the actual reservoir is determined by taking the original bottom hole flowing pressure of the actual reservoir as the starting point, the obtained reservoir stress sensitivity is more in line with the actual situation of the reservoir, and the obtained reservoir stress sensitivity is more accurate, which provides more valuable values for reservoir protection, oilfield development, and development planning.

Stress sensitivity analysis method for fractured gas reservoir

A method for determining well wall collapse of a single well for a fractured-vuggy reservoir is provided. The method includes following steps: S, treating the single well of the fractured-vuggy reservoir as an isolated reservoir; S, calculating a water influx rate for the fractured-vuggy reservoir; S, substituting a formula of the water influx rate into a material balance equation; S, calculating a change of an oil productivity index without considering the well wall collapse; S, establishing an optimizing model for obtaining the oil productivity index; S, calculating the formation pressure at any time in production through step S; S, calculating the oil productivity index at any time through the formation pressure, and establishing an optimal objective function; and S, calculating a difference between the oil productivity index at any time and the theoretically calculated oil productivity index at any time, and determining whether the difference meets an accuracy requirement.

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Chengdu, China

Nutao Wang