摘要
为了优化设计致密/页岩油藏水力裂缝参数,针对传统拟稳态设计方法的局限性,开展统一压裂设计与三线性流模型的结合,得到水力裂缝参数与全流态产能的对应关系。以长庆油田长-7段一口压裂水平井为例,研究得到其最优的裂缝半长为150 m,对应的无因次导流能力为1.84,单缝10年最大累产量为4 015 t。进一步分析可知,给定支撑剂量一定时,当油藏渗透率较低时(如0.001 mD),无因次导流能力较大(>10),产能随着半缝长的增加而增大,更适合造长缝。研究结果对致密/页岩储层压裂优化设计具有一定指导意义。
In order to optimize the design of hydraulic fracture parameters in tight/shale reservoirs,in view of the limitations of traditional pseudo-steady-state design methods,the unified facture design and the trilinear flow model are combined to obtain the corresponding relationship between hydraulic fracture parameters and full flow state productivity.Taking a fractured horizontal well in the Chang-7 section of Changqing Oilfield as an example,the research shows that the optimal fracture half-length is 150 m,the corresponding dimensionless conductivity is 1.84,and the ten years maximum cumulative production of a single fracture is 4015 t.Further analysis shows that when the given proppant dose is constant,when the reservoir permeability is low(such as 0.001 mD),the dimensionless conductivity is larger(>10),and the productivity increases with the increase of the half fracture length,more suitable for creating long fracture.The research results have certain guiding significance for the optimal design of tight/shale reservoir fracturing.
作者
方立勤
梁秀丽
杨承伟
郑自刚
王秀坤
盛家平
乐平
FANG Liqin;LIANG Xiuli;YANG Chengwei;ZHENG Zigang;WANG Xiukun;SHENG Jiaping;YUE Ping(The Conventional Oil and Gas Institute,China University of Petroleum(BeiJing),Beijing 102249,China;Exploration and Development Research Institute of Daqing Oilfield,Heilongjiang Daqing 163000,China;Exploration and Development Research Institute of Changqing Oilfiled,Xi’an 710018,China;SKL of Oil&Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China)
出处
《非常规油气》
2021年第2期120-126,共7页
Unconventional Oil & Gas
基金
北京市自然科学基金青年科学基金项目“致密油藏复杂孔缝系统内油水交换机制的多尺度模拟研究”(2214077)
国家自然科学基金面上项目“页岩油藏空气氧化热破裂机制研究”(51974334)
国家重大科技专项“长庆特/超低渗油藏CO_(2)驱油与埋存关键技术研究”(2016ZX05016-003)。
关键词
致密/页岩油
压裂水平井
统一压裂设计
三线性流
tight/shale oil reservoirs
fractured horizontal well
unified fracturing design
trilinear flow model
