准噶尔盆地玛湖凹陷砾岩油藏水平井组重复压裂时机优化  

Optimization of horizontal well pattern re-fracturing timing in conglomerate reservoir in Mahu Sag of Junggar Basin

作　　者：任广聪 马新仿[1] 张士诚[1] 邹雨时[1] 段贵府 熊启勇 REN Guangcong;MA Xinfang;ZHANG Shicheng;ZOU Yushi;DUAN Guifu;XIONG Qiyong(College of Petroleum Engineering,China University of Petroleum,Beijing 102249,China;Petro-China Research Institute of Petroleum Exploration and Development,Beijing 100083,China;Engineer-ing Technology Research Institute,PetroChina Xinjiang Oilfield Company,Karamay 834000,China)

机构地区：[1]中国石油大学(北京)石油工程学院,北京102249 [2]中国石油勘探开发研究院,北京100083 [3]中国石油新疆油田公司工程技术研究院,新疆克拉玛依834000

出　　处：《大庆石油地质与开发》2023年第2期167-174,共8页Petroleum Geology & Oilfield Development in Daqing

基　　金：中国石油战略合作科技专项“玛湖砾岩油藏提高采收率机理及关键技术研究”(ZLZX2020-01-04)。

摘　　要：准噶尔盆地玛湖凹陷砾岩油藏可通过水平井重复压裂同时钻加密井的改造方式,提高单井产量和油藏动用程度,但是在加密井投产时,水平井组的重复压裂时机目前仍不明确。针对这一问题,建立不同投产时间水平井组初次压裂和重复压裂的裂缝扩展模型和油藏数值模型,通过产量历史拟合确定模型的正确性。基于井组最优累计产油量,优化重复压裂时机。结果表明:加密井不生产时,单井的最优重复压裂时机为投产后第4年,井组的最优重复压裂时机为最晚投产井投产后第4年;加密井生产时,单井的最优重复压裂时机为投产后第5年,井组的最优重复压裂时机为最晚投产井投产后第3年。井组重复压裂考虑水平井加密时,总体增油效果优于仅老井重复压裂,应及时钻加密井,获取最大井组累计产油量。研究结果为致密油藏考虑加密井的水平井组重复压裂时机优选提供理论依据。The single-well production and reservoir producing degree of Mahu Sag conglomerate reservoir in Junggar Basin can be increased by drilling infill wells while re-fracturing parent horizontal wells, but the best re-frac timing is not determined when considering infill wells production. Aiming to this problem, fractures propagation model and reservoir numerical model of primary fracturing and re-fracturing of horizontal well pattern at different time are es-tablished with reliability validation by production history matching. Re-fracturing timing is optimized based on opti-mal cumulative production of the well pattern. The results indicate that without infill wells production, the best re-frac timing for single well is the 4th year after commencing production, and for well pattern is the 4th year after the last well commenced production. With infill wells production, the best re-frac timing for single well is the 5th year after being put into production, and for well pattern is the 3th year after the last well commenced production. Re-fracturing with infill wells obtains more cumulative oil production than only re-fracturing parent wells. Infill wells should be drilled in time to obtain maximum cumulative production of the well pattern.This research provides theoretical basis for the re-fracturing time optimization of horizontal well pattern considering infill wells.

关 键 词：重复压裂 水平井组 加密井 压裂时机 累计产量 准噶尔盆地 玛湖凹陷 砾岩油藏 

分 类 号：TE357.1[石油与天然气工程—油气田开发工程]