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

油气藏评价与开发 ›› 2021, Vol. 11 ›› Issue (1): 117-123.doi: 10.13809/j.cnki.cn32-1825/te.2021.01.016

自生固相化学压裂缝内温度分布数值模拟

罗志锋¹(),张楠林¹,赵立强¹(),鲜超¹,王春雷²,庞琴³

1.西南石油大学油气藏地质及开发工程国家重点实验室,四川成都 610500
2.中国石油塔里木油田分公司天然气事业部井下作业部,新疆库尔勒 841000
3.中国石油玉门油田分公司勘探开发研究院,甘肃酒泉 735000

收稿日期:2019-06-10 出版日期:2021-02-26 发布日期:2021-02-04
通讯作者: 赵立强 E-mail:lzf03429@163.com;zhaolq@vip.163.com
作者简介:罗志锋（1981—）,男,博士,副教授,主要从事油气藏动态及增产改造理论与技术方面的教学与科研工作。地址：四川省成都市新都区新都大道8号,邮政编码：610500。E-mail:lzf03429@163.com
基金资助:
国家自然科学基金“缝洞型碳酸盐岩靶向酸压复杂裂缝扩展机理及调控方法研究”(51974264);国家科技重大专项“四川盆地大型碳酸盐岩气田开发示范工程”(2016ZX05052);国家科技重大专项“缝洞型碳酸盐岩油藏提高采收率关键技术”(2016ZX05014)

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

Luo Zhifeng¹(),Zhang Nanlin¹,Zhao Liqiang¹(),Xian Chao¹,Wang Chunlei²,Pang Qin³

1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
2. Downhole Operation Department of Natural Gas Division, CNPC Tarim Oilfield Company, Korla, Xinjiang 841000, China
3. Exploration and Development Research Institute,Yumen Oilfield Branch of CNPC, Jiuquan, Gansu 735000, China

Received:2019-06-10 Online:2021-02-26 Published:2021-02-04
Contact: Zhao Liqiang E-mail:lzf03429@163.com;zhaolq@vip.163.com

摘要/Abstract

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。

关键词: 自生固相, 化学压裂, 黏温函数, 温度场, 体积比

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

中图分类号:

TE357

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(1): 117-123.

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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参考文献 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

自生固相化学压裂缝内温度分布数值模拟

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

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