Southwest Petroleum University

Southwest Jiaotong University

Chengyang Zhang

Nutao Wang

Yue Cao

Hang Li

Hui Chen

Yi Xu

Siyi He

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.

Method for determining well wall collapse of single well for fractured-vuggy reservoir

A preparation method of Yttrium oxide dispersed and strengthened titanium alloy powders. The method includes following steps: mixing alloying elements according to alloy element ratios of: 0.1 wt % to 1.0 wt % Y, 5.5 wt % to 6.8 wt % Al, 3.5 wt % to 4.5 wt % V, Ti as balance, preparing alloy ingots by vacuum smelting process, and performing forging and rolling process; performing mechanical treatment for forged and rolled alloy ingots, to obtain alloy rods that meet size requirement of plasma rotating electrode process; preparing titanium alloy powders based on alloy rods by the plasma rotating electrode process; preparing parameters are: rotating speed of the alloy rods is 25000 r/min to 35000 r/min, a feeding speed of the alloy rods is 1.0 mm/s to 2.0 mm/s, power of the plasma gun is 60 kw to 140 kw, a temperature of the inert gas is 200° C. to 400° C., oxygen content of atomization chamber not greater than 100 ppm.

Preparation method of titanium alloy powders

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Chengdu, China

Chengyang Zhang