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

Luo Zhifeng; Zhang Nanlin; Zhao Liqiang; Xian Chao; Wang Chunlei; Pang Qin

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

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Numerical simulation of temperature field in self-generated solid chemical fracturing
Issue 1, Pages: 117-123(2021)
Published：2021
DOI： 10.13809/j.cnki.cn32-1825/te.2021.01.016
稿件说明：

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[1]罗志锋,张楠林,赵立强,鲜超,王春雷,庞琴.自生固相化学压裂缝内温度分布数值模拟[J].油气藏评价与开发,2021,11(01):117-123. DOI： 10.13809/j.cnki.cn32-1825/te.2021.01.016.

Luo Zhifeng, Zhang Nanlin, Zhao Liqiang, et al. Numerical simulation of temperature field in self-generated solid chemical fracturing[J]. Petroleum Reservoir Evaluation and Development, 2021, (1): 117-123. DOI： 10.13809/j.cnki.cn32-1825/te.2021.01.016.

摘要

自生固相化学压裂中裂缝几何尺寸、相变时机等均与裂缝温度场密切相关。在拟三维裂缝扩展模型的基础上

建立了缝内温度场模型

并进行耦合求解

该模型考虑了自生固相化学压裂液体系黏度随温度的变化

并对两相压裂液进行均相处理。通过实例计算

结果表明:温度场、压裂液体系黏度、裂缝几何尺寸之间相互影响;增加低比热容、高热传导系数的非相变压裂液体积

有利于提高缝内温度

使相变压裂液尽快相变

形成稳定支撑;根据裂缝内的温度分布情况

可选用不同相变温度的压裂液体系

达到"快速相变、有效支撑"的目的。通过研究

能够帮助提高自生固相化学压裂材料和工艺设计的针对性。

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.