基于地质力学的裂缝性储层水平井井眼方位优化
发布时间：2019-02-23 16:37
【摘要】：由于裂缝性储层裂缝发育,裂缝性储层水平井与常规储层水平井相比,优化水平井井眼方位需要考虑的因素更多,也更为复杂。文中以地质力学为基础,在优选裂缝性储层水平井井眼方位的同时,考虑天然裂缝分布、天然裂缝的激发和井眼稳定性,从地质、钻井和压裂的角度出发,采用理论研究和数值模拟,形成了裂缝性储层水平井井眼方位优化方法。首先,根据井壁成像数据对天然裂缝分布进行统计分析,选择天然裂缝发育的方位;其次,通过建立天然裂缝面的应力模型,计算在一定压裂压力下容易滑动的天然裂缝方位;最后,通过建立裂缝性储层的井眼稳定模型,计算出在确定的方位范围内井眼相对稳定的方位作为优选的水平井方位。优选的裂缝性储层井眼稳定方位既有利于压裂裂缝与天然裂缝沟通,又相对容易激发天然裂缝,且井眼相对稳定,对于提高单井产量、减少工程复杂有重要作用。
[Abstract]:Due to the development of fractures in fractured reservoirs, there are more factors to be considered and more complex to optimize the hole orientation of horizontal wells compared with conventional horizontal wells. Based on geomechanics, this paper considers the distribution of natural fractures, the stimulation of natural fractures and wellbore stability while selecting the orientation of horizontal wellbore in fractured reservoir, and sets out from the angle of geology, drilling and fracturing. Based on theoretical research and numerical simulation, a method of hole azimuth optimization for horizontal well in fractured reservoir is developed. Firstly, the distribution of natural fractures is statistically analyzed according to the imaging data of wellbore, and the orientation of natural fractures is selected. Secondly, by establishing the stress model of natural fracture surface, the orientation of natural fractures that slide easily under a certain fracturing pressure is calculated. Finally, through establishing the wellbore stability model of fractured reservoir, the relative stable azimuth of borehole is calculated as the optimum horizontal well azimuth in the determined azimuth range. The optimal wellbore stability orientation of fractured reservoirs is not only conducive to the communication between fracturing fractures and natural fractures, but also relatively easy to stimulate natural fractures, and the borehole is relatively stable, which plays an important role in increasing the production rate of single well and reducing the complexity of engineering.
【作者单位】： 中国石油塔里木油田分公司油气工程研究院;中国石油集团钻井工程技术研究院;
【基金】：国家科技重大专项“大型油气田及煤层气开发”课题“钻井工程设计和工艺软件”(2011ZX05021-006)
【分类号】：TE243
[Abstract]:Due to the development of fractures in fractured reservoirs, there are more factors to be considered and more complex to optimize the hole orientation of horizontal wells compared with conventional horizontal wells. Based on geomechanics, this paper considers the distribution of natural fractures, the stimulation of natural fractures and wellbore stability while selecting the orientation of horizontal wellbore in fractured reservoir, and sets out from the angle of geology, drilling and fracturing. Based on theoretical research and numerical simulation, a method of hole azimuth optimization for horizontal well in fractured reservoir is developed. Firstly, the distribution of natural fractures is statistically analyzed according to the imaging data of wellbore, and the orientation of natural fractures is selected. Secondly, by establishing the stress model of natural fracture surface, the orientation of natural fractures that slide easily under a certain fracturing pressure is calculated. Finally, through establishing the wellbore stability model of fractured reservoir, the relative stable azimuth of borehole is calculated as the optimum horizontal well azimuth in the determined azimuth range. The optimal wellbore stability orientation of fractured reservoirs is not only conducive to the communication between fracturing fractures and natural fractures, but also relatively easy to stimulate natural fractures, and the borehole is relatively stable, which plays an important role in increasing the production rate of single well and reducing the complexity of engineering.
【作者单位】： 中国石油塔里木油田分公司油气工程研究院;中国石油集团钻井工程技术研究院;
【基金】：国家科技重大专项“大型油气田及煤层气开发”课题“钻井工程设计和工艺软件”(2011ZX05021-006)
【分类号】：TE243
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