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《China Petroleum Exploration》 2014-06
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Optimization Techniques for Stimulation Design of Horizontal Wells of Heterogeneous Tight Oil in Northern Songliao Basin

Jin Chengzhi;Yang Dong;Zhang Yongping;Huo Fenglong;Gu Mingyong;Petro China Daqing Oilfield Company Limited;  
The tight oil reservoir in the northern part of Songliao Basin is the sedimentation of semi-deep to deep lacustrine facies mingled with delta frontal subfaices and fluvial facies. It is characterized as decentralized longitudinally,instable horizontally,small in sweet-point scale,poor flat connectivity,changeable in physical properties,and different in oil bearing properties. The mechanical difference,caused by strong heterogeneity,makes fractures extend non-uniformly and leads to more fracturing sections and a larger fracturing scale so that high requirements are set on the proppant,raw materials and operational facilities. Equal fractural spacing fracturing design is not suitable in this region. To solve this problem,the techniques for stimulation design have been developed for optimization of fractural spacing,division of fracturing sections,optimization of perforation,optimization of fractural length and height and optimization of fractural conductivity so that optimization of fractural system can be achieved in volumetric fracturing of heterogeneous reservoirs. Meanwhile,optimization arrangement of fracturing fluid,proppant and surface facilities met the requirements for a large-scale volumetric renovation of tight oil reservoir in northern part of Songliao Basin. A total of 10 wells with 97 sections were tested on the field. The single-well production reached 40 m3/d on average,17 times as high as that from the neighboring straight wells with the same conditions of physical properties. Continental heterogeneous tight oil reservoirs were brought under effective renovation. The techniques are of a great significance to Daqing to increase tight oil reserves and production.
【Fund】: 国家科技重大专项“大型油气田及煤层气开发”(2011ZX05001-001-004);; 中国石油天然气集团公司重大科技专项“大庆探区非常规油气勘探开发关键技术研究与现场试验”(2012E-2603)
【CateGory Index】: TE357
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