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气井压裂开发是目前提高低孔低渗气藏开发效果的有效手段。水平井压裂作为低渗透油气藏开发的一项前沿技术,为了充分达到改造效果,裂缝参数必须设计得合理。以大牛地气田低孔低渗油藏为例,采用数值模拟和现场施工参数相结合的方法,对裂缝夹角、裂缝间距、裂缝段数和裂缝缝长等参数进行优化,得出以下几点优化结果:合理的裂缝夹角利于储量动用,进而能够沟通含油气显示富集区,研究表明井眼轨迹方向与最大主应力方向大于60°为宜;合理的裂缝间距和裂缝段数能够增加改造面积,提高单井产量,100-166m为压裂缝最优间距(即6-10段/1000m);裂缝缝长是裂缝参数优化中的一个重要参数,通过建立不同渗透率下的裂缝半长与产能的关系,结合气田本身地质特征,优化裂缝半长在150-250m左右。在此基础上寻求裂缝参数的最优组合,为解决水平井整体压裂裂缝参数的优选问题提供了思路和借鉴。
Gas well fracturing is an effective way to improve the development effect of low porosity and permeability gas reservoirs. As a cutting-edge technology for the development of low-permeability reservoirs, horizontal well fracturing must be properly designed in order to fully achieve the transformation effect. Taking the low porosity and low permeability reservoirs in Daniudi gas field for example, the parameters of crack angle, crack spacing, crack number and crack length were optimized by the combination of numerical simulation and on-site construction parameters. The following points The results of the optimization are as follows: a reasonable angle between fractures is conducive to reserves utilization, so that oil and gas enrichment zones can be communicated. It is indicated that the direction of wellbore trajectory and the direction of maximum principal stress are more than 60 °. Reasonable crack spacing and number of fractures can increase the area for reconstruction , Improve single-well production, and 100-166m is the optimal spacing of fractures (ie, 6-10 segments / 1000m). The fracture length is an important parameter in the optimization of fracture parameters. Through establishing the fracture half- According to the geological characteristics of the gas field, the optimized fracture length is about 150-250m. Based on this, finding the optimal combination of fracture parameters provides a way of thinking for solving the optimization problem of the overall fracturing parameters in horizontal wells.