浅层致密油藏空间编织井网开发数值模拟研究  

Numerical simulation of spatial-braided bow-shape well pattern development in shallow tight reservoir

作　　者：冯宁 彭小龙[1] 薛晓军 王超文 邓鹏 吴昊强 FENG Ning;PENG Xiaolong;XUE Xiaojun;WANG Chaowen;DENG Peng;WU Haoqiang(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China;CNPC Xibu Drilling Engineering Company Limited,Karamay,Xinjiang 834000,China)

机构地区：[1]西南石油大学油气藏地质及开发国家重点实验室,四川成都610500 [2]中国石油西部钻探工程有限公司地质研究院,新疆克拉玛依834000

出　　处：《油气藏评价与开发》2021年第6期897-904,共8页Petroleum Reservoir Evaluation and Development

基　　金：国家油气重大专项“大型油气田及煤层气开发”(2016ZX05015)。

摘　　要：浅层致密油藏中水力压裂容易产生水平缝。对于水平井而言,多级压裂容易只生成一条大的水平缝,增产效果不佳。而“弓形水平井+多级水平缝”的单井方式,也不能有效动用此类油藏。为了进一步提高浅层致密油藏的动用程度,基于浅层油层钻井的可行性,提出了浅层致密油藏空间编织井网的开发方式,并采用数值模拟方法,验证了空间编织井网的有效性。数值模拟结果表明:在相同的井数和钻井进尺条件下,空间编织井网的油产量、累产油量、油藏采出程度高于正对井排和交错井排;不过随着水平压裂缝规模扩大,与交错井排的差距减小。同时,根据模拟得出采用七点井网注水补充了地层能量,也改变了渗流状态,使得区域边缘和井间剩余油得以有效驱替,采收率明显提高。研究结果为浅层致密油藏的高效开发提供借鉴。In shallow tight reservoirs, the hydraulic fracturing tends to produce horizontal fractures. For the horizontal wells, multistage fracturing is easy to generate only one large horizontal fracture, which leads to poor stimulation effect. However, the single well mode of“bow-shape horizontal well + multi-stage horizontal fractures”can not effectively explore this kind of reservoir. In order to further improve the production degree of shallow tight reservoir, the development mode of spatial-braided well pattern in shallow tight reservoir is proposed based on the feasibility of shallow reservoir drilling, and the numerical simulation is used to verify the effectiveness of spatial-braided well pattern. The numerical simulation results show that under the same number of wells and drilling footage, the oil production, cumulative oil production and reservoir recovery degree of spatial-braided well pattern are higher than those of the opposite well pattern and staggered well pattern. However, with the expansion of the fracture scale in horizontal fracturing, the gap with staggered well pattern decreases. At the same time, according to the simulation, the reverse 7-point pattern water injection not only replenishes the formation energy, but also changes the seepage state, so that the remaining oil in the regional edge and between wells can be effectively displaced, and the recovery rate is significantly improved. The researches provide efficient development method for the efficient development of shallow tight reservoir.

关 键 词：浅层油藏 致密油藏 水平缝 弓形井 空间编织井网 

分 类 号：TE349[石油与天然气工程—油气田开发工程]