西南石油大学学报(自然科学版) ›› 2023, Vol. 45 ›› Issue (2): 77-86.DOI: 10.11885/j.issn.1674-5086.2020.10.28.02

• 石油与天然气工程 • 上一篇    下一篇

可变形天然裂缝动态宽度流-固耦合计算模型

彭浩1,2, 李黔2, 高佳佳2, 尹虎2, 陈一凡1   

  1. 1. 中国石油集团川庆钻探工程有限公司川西钻探公司, 四川 成都 610051;
    2. 西南石油大学石油与天然气工程学院, 四川 成都 610500
  • 收稿日期:2020-10-28 发布日期:2023-05-05
  • 通讯作者: 李黔,E-mail:liqianswpi@vip.sina.com
  • 作者简介:彭浩,1988年生,男,汉族,四川达州人,博士,主要从事钻井工艺、钻井事故复杂处理及钻井数字化相关技术研究。E-mail:478536382@qq.com
    李黔,1962年生,男,汉族,四川成都人,教授,主要从事油气井工程方面的科研及教学工作。E-mail:liqianswpi@vip.sina.com
    高佳佳,1989年生,男,汉族,陕西泾阳人,副研究员,博士,主要从事孔隙介质力学井壁稳定方面的研究。E-mail:jiajgao@swpu.edu.cn
    尹虎,1978年生,男,汉族,四川蓬安人,副教授,博士,主要从事钻井岩石力学及井壁稳定性研究、复杂深井超深井钻井技术、钻井复杂事故信息化与智能化处理的研究。E-mail:yinhu@swpu.edu.cn
    陈一凡,1993年生,男,汉族,四川成都人,工程师,硕士,主要从事钻井工艺研究。E-mail:chenyifan_sc@cnpc.com.cn
  • 基金资助:
    国家重点研发计划(2019YFA0708302)

Calculation Model of Hydro-mechanical Coupling for Dynamic Width of Deformable Natural Fracture

PENG Hao1,2, LI Qian2, GAO Jiajia2, YIN Hu2, CHEN Yifan1   

  1. 1. Chuanxi Drilling Company, Chuanqing Drilling Engineering Company Limited, CNPC, Chengdu, Sichuan 610051, China;
    2. Petroleum Engineering School, Southwest Petroleum University, Chengdu, Sichuan 610500, China
  • Received:2020-10-28 Published:2023-05-05

摘要: 针对当前的天然裂缝宽度预测模型没有考虑裂缝在缝内流动净压力作用下变形的问题,开展了可变形天然裂缝动态宽度流-固耦合计算模型研究。首先,根据天然裂缝的变形控制方程和缝内流动净压力方程建立流-固耦合漏失动力学模型,得到漏失速率和漏失前端侵入速度的控制方程;然后,运用自适应搜索法求取天然裂缝等效平均宽度,结合体积等效原则求得天然裂缝初始宽度,联合初始宽度和漏失速率的几何控制方程建立天然裂缝形态系数的求解方法;最后,基于漏失前端侵入速度的几何控制方程进行天然裂缝形态约束求解得到法向刚度,进而得到天然裂缝动态宽度流-固耦合计算模型。建立的可变形天然裂缝动态宽度流-固耦合计算模型,经验证其计算结果与现场测量数据吻合较好,仅需钻井液性能、井漏现场测量的漏失速率序列及漏失体积序列,就能进行天然裂缝动态宽度预测,便于现场应用。

关键词: 裂缝性漏失;可变形天然裂缝;流-固耦合;动态宽度;计算模型

Abstract: Aiming at the fact that existing models for calculating the dynamic width of natural fractures fail to consider the compression deformation of the fracture under the net flow pressure in the fracture,the model of hydro-mechanical coupling for dynamic width of natural fracture is studied.Firstly,according to the deformation law of natural fracture wall and the net flow pressure equation in the fracture,a hydro-mechanical coupling leakage dynamic model is established,by which the geometric control equations of the leakage rate and the invasion velocity of the leakage front distance are obtained;then,the self-adaptive search method is used to calculate the equivalent average width of the natural fracture,and the initial width of the natural fracture is obtained based on the volume equivalent principle.The solution method of the natural fracture shape coefficient is established by combining the geometric control equations of leakage rate and the initial width;finally,according to the geometric governing equation of the invasion velocity of the leakage front distance,the natural fracture shape constraint is solved to obtain the normal stiffness,and then the model of hydro-mechanical coupling for dynamic width of natural fracture is obtained.The model of hydro-mechanical coupling for dynamic width of natural fracture has been verified on-site and the calculation results are in good agreement with the on-site measured data.Only the drilling fluid performance,the lost circulation rate sequence and the lost volume sequence measured on-site are needed to predict the dynamic width of natural fractures,which is convenient for on-site application.

Key words: fracture leakage;deformable natural fracture;hydro-mechanical coupling;dynamic width;calculation model

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