自生固相化学压裂缝内温度分布数值模拟

doi:10.13809/j.cnki.cn32-1825/te.2021.01.016

Abstract

Abstract:

The geometry size of fractures and the time of phase change in chemical fracturing by self-generated solid are closely related to the temperature field of cracks. Based on the pseudo-three-dimensional crack propagation model, a coupled temperature field model of the cracks is established. And its coupling solution is carried out. This model takes into account the variation of viscosity of self-generated solid chemical fracturing fluids with temperature, and applies homogeneous treatment to two-phase fracturing fluids. The practical calculation results show that mutual influence among temperature field, viscosity of fracturing fluid system and fracture geometry. The increase of non-phase-change fracturing fluid accumulation with low specific heat capacity and high heat conduction coefficient is conducive to the improvement of the temperature in the cracks and the rapid phase-change of phase-change fracturing fluid to form stable support. According to the temperature distribution in the cracks, the fracturing fluid system with different phase change temperature can be selected to achieve the purpose of “phase transition in a short time and with effective support”. The research result helps to improve the pertinence of self-generated solid chemical fracturing working fluid system and operation technology design.

Key words: self-generated solid, chemical fracturing, function between viscosity and temperature, temperature field, volume ratio

CLC Number:

TE357

Luo Zhifeng,Zhang Nanlin,Zhao Liqiang,Xian Chao,Wang Chunlei,Pang Qin. Numerical simulation of temperature field in self-generated solid chemical fracturing[J].Reservoir Evaluation and Development, 2021, 11(1): 117-123.

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References 23

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参数		数值	参数		数值
施工排量（m³/min）		5	岩石杨氏模量（GPa）		30
施工时间（min）		50	泊松比		0.2
原始地层温度（℃）		95	岩石热传导系数[W/（m·K）]		5.2
注入流体温度（℃）		30	岩石比热容[J/（kg·K）]		999
储层厚度（m）		30	岩石密度（kg/m³）		2 650
地层原油密度（kg/m³）		840	综合滤失系数（m/min^0.5）		0.002
原油比热容[J/（kg·K）]		1 980	孔隙度		0.2
原油热传导系数[W/（m·K）]		0.339	密度（kg/m³）	相变压裂液	1 100
原油热传导系数[W/（m·K）]		0.339	密度（kg/m³）	非相变压裂液	1 050
比热容[J/（kg·K）]	相变压裂液	4 180	体积分数	相变压裂液	0.5
比热容[J/（kg·K）]	非相变压裂液	1 200	体积分数	非相变压裂液	0.5
热传导系数[W/（m·K）]	相变压裂液	0.38	黏温关系	相变压裂液	μ=626.5T^-0.911 （20≤T≤120）
热传导系数[W/（m·K）]	非相变压裂液	0.65	黏温关系	非相变压裂液	μ=379.16T^-0.546 （20≤T≤120）

计算条件	缝长（m）	最大缝高（m）	最大缝宽（mm）
非稳态变化温度	79.14	56.43	4.2
地层温度	83.22	48.17	3.7
平均温度	80.23	51.82	3.9

Numerical simulation of temperature field in self-generated solid chemical fracturing

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