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

• 综合研究 • 上一篇    下一篇

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. 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. 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:

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