重复压裂应力场分布技术的研究

发布时间：2018-06-15 07:49

本文选题：重复压裂 + 裂缝　；参考：《东北石油大学》2015年硕士论文

【摘要】：我国的油藏具有较低渗率透油层资源非常丰富,因此对低渗率透油层的开发和利用是关系我国能源安全的重要组成部分。经过历史和未来的技术发展证明,可以通过对其重复压裂手段来实现增产,从而可以使我国的石油总产量得到极大的提高,并且可以创造巨大的经济效益。重复压裂技术的以其效果显著,见效快等优点而著称,成为生产井增产,注水井增注的主要技术措施。本文通过对我国油藏资源的分析,指出了重复压裂技术在我国实施的必要性。根据原地应力是由上覆岩层压力引起的基本原理,建立了原地应力模型,并求出原地应力。根据岩石力学、弹性力学基本理论,建立了初次裂缝产生的诱导应力模型和邻井人工裂缝产生的诱导应力模型,并求出沿裂缝延伸方向和垂直裂缝延伸方向的最大最小水平主应力的变化规律。综合以上模型及由生产/注入活动引起的孔隙压力变化诱导应力模型和温度场变化诱导应力模型建立了重复压裂前地应力场分布模型,为分析重复压裂裂缝重新定向机理提供了理论支持。编写了计算机程序,实现了人工裂缝诱导应力的计算,绘制了沿裂缝延伸方向和垂直裂缝延伸方向的最大最小水平主应力的变化规律曲线,得出了邻井人工裂缝对重复压裂应力场分布的影响。
[Abstract]:The reservoirs in China are rich in low permeability reservoirs, so the development and utilization of low permeability reservoirs is an important part of energy security in China. It has been proved by history and future technological development that the production increase can be achieved by means of repeated fracturing, thus the total oil output of our country can be greatly improved, and great economic benefits can be created. The technology of repeated fracturing is famous for its advantages such as remarkable effect and quick effect. It has become the main technical measure for increasing production and injection in production wells and water injection wells. Based on the analysis of reservoir resources in China, this paper points out the necessity of the application of repeated fracturing technology in China. According to the principle that the in-situ stress is caused by the overlying strata pressure, the in-situ stress model is established and the in-situ stress is calculated. According to the basic theory of rock mechanics and elastic mechanics, the induced stress model of primary fracture and artificial fracture of adjacent well is established. The variation law of maximum and minimum horizontal principal stress along fracture extension direction and vertical fracture extension direction is obtained. Based on the above models and the induced stress model of pore pressure induced by production / injection activity and the temperature field induced stress model, the distribution model of in-situ stress field before repeated fracturing is established. It provides theoretical support for analyzing the reorientation mechanism of refracturing fracture. A computer program is written to calculate the induced stress of artificial crack. The curve of the maximum and minimum horizontal principal stress along the direction of crack extension and vertical crack extension is plotted. The influence of artificial fractures in adjacent wells on the distribution of stress field in repeated fracturing is obtained.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357

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