西南石油大学学报(自然科学版) ›› 2019, Vol. 41 ›› Issue (3): 80-90.DOI: 10.11885/j.issn.1674-5086.2018.10.28.01

• 石油与天然气工程 • 上一篇    下一篇

水力裂缝形貌对酸刻蚀行为及导流能力影响

苟波1,2, 李骁1, 马辉运3, 周长林3   

  1. 1. “油气藏地质及开发工程”国家重点实验室·西南石油大学, 四川 成都 610500;
    2. 西南石油大学博士后科研流动站, 四川 成都 610500;
    3. 中国石油西南油气田公司工程技术研究院, 四川 成都 610017
  • 收稿日期:2018-10-28 出版日期:2019-06-10 发布日期:2019-06-10
  • 通讯作者: 苟波,E-mail:swpugb@163.com
  • 作者简介:苟波,1984年生,男,汉族,四川阆中人,讲师,博士/博士后,主要从事油气藏增产技术研究与教学。E-mail:swpugb@163.com;李骁,1994年生,男,汉族,四川南充人,硕士,主要从事油气藏增产技术方面的研究。E-mail:279834235@qq.com;马辉运,1968年生,男,汉族,四川南充人,高级工程师,硕士,主要从事油气田开发工程的科研生产管理工作。E-mail:myah@petrochina.com.cn;周长林,1979年生,男,汉族,四川双流人,高级工程师,硕士,主要从事压裂酸化工艺技术研究及应用工作。E-mail:zhouchanglin@petrochina.com.cn
  • 基金资助:
    中国石油重大科技专项(2016E-0609)

Effects of Morphology of Hydraulic Fractures on Acid Etching Behaviors and Fluid Diversion Capacity

GOU Bo1,2, LI Xiao1, MA Huiyun3, ZHOU Changlin3   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    2. Post-doctoral Research Center, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    3. Engineering and Technology Research Institute, PetroChina Southwest Oil & Gas Field Company, Chengdu, Sichuan 610017, China
  • Received:2018-10-28 Online:2019-06-10 Published:2019-06-10

摘要: 目前酸压裂缝导流能力实验多采用光滑岩板模拟地层水力裂缝,忽略了裂缝粗糙形貌对酸刻蚀行为、导流能力影响。采用自研装置"酸压裂缝导流能力测试系统",分别用光滑岩板、粗糙岩板模拟光滑裂缝、粗糙裂缝,研究了不同注酸排量、注酸时间下两种不同形貌水力裂缝的酸刻蚀行为和导流能力特征。结果表明,酸刻蚀后光滑裂缝轮廓线迂曲度增加;粗糙裂缝相反,酸刻蚀作用体现为削"峰"深"谷"。增加注酸排量或注酸时间,粗糙裂缝的高程变化、裂缝宽度、酸溶蚀量和导流能力增加幅度均明显大于光滑裂缝,且导流保持能力更好;粗糙裂缝对注酸参数变化更敏感。粗糙岩板利于真实评价储层条件下酸压裂缝导流能力,提高酸压方案设计的针对性,改善酸压效果。

关键词: 水力裂缝形貌, 粗糙裂缝, 光滑裂缝, 酸刻蚀形态, 导流能力

Abstract: At present, most simulations of hydraulic fractures are conduced based on the assumption of smooth parallel plates, ignoring the effects of the morphology of the fractures on acid etching behaviors and fluid diversion capacity. A self-developed device named "acid pressure test system for fracture fluid diversion" was used to simulate smooth and rough fractures, respectively, with smooth and rough plates to study the characteristics of acid etching behaviors and diversion capacity of the two types of fracture morphology with different acid injection volumes and periods. The results show that the tortuosity of the fracture profile increased after acid etching for smooth fractures, whereas the opposite was observed for rough fractures, as acid etching reduced the peaks and deepened the troughs. Increasing the acid injection volume or period led to significantly larger change in elevation, fracture width, acid dissolution amount, and diversion capacity for rough fractures than for smooth fractures, whereas the former had not only better retention ability of fluid diversion, but also higher sensitivity to changes in acid injection parameters. In conclusion, the assumption of rough plates is beneficial for realistically evaluating the diversion capacity of acid pressure fractures under reservoirs, thus improving the targetedness of the acid pressure scheme design and the acid pressure effect.

Key words: hydraulic fracture morphology, rough fracture, smooth fracture, acid etching, diversion capacity

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