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在裂缝分布特征研究的基础上,对大庆台肇地区裂缝对注水的影响进行了分析。结果表明,该区葡萄花低渗透砂岩油层发育有近东西向、北西向、近南北向和北东向4组高角度构造裂缝,裂缝的储集能力较弱,主要起渗流通道作用。受现今地应力等因素的影响,上述4组裂缝在井口的开启压力分别为15.1,19.6,27.8和28.0 MPa,反映了不同方位裂缝在油田注水开发过程中的开启序列。目前,该区的注水压力基本超过了东西向裂缝的开启压力,因而东西向裂缝的注水反映特征十分明显。根据不同方向裂缝的渗流特点,采用线性注水、动态调配水、周期注水、层断间注及高含水井关井间抽等措施,进一步完善注采系统,可有效地提高注水开发效果。
Based on the study of fracture distribution, the influence of cracks on waterflooding in Taizhao area of Daqing was analyzed. The results show that there are four sets of high-angle structural fractures in the low permeability sandstone reservoir of Putaohua, including east-west direction, north-west direction, near-north-north direction and northeastern direction. The fractures have low reservoir capacity and mainly act as percolation channels. Affected by the current geostress and other factors, the opening pressures of the four cracks at the wellhead are 15.1, 19.6, 27.8 and 28.0 MPa, respectively, reflecting the opening sequence of different azimuth cracks in the process of oilfield waterflood development. At present, the water injection pressure in the area basically exceeds the cracking pressure of the east-west fracture, so the water injection reflection characteristic of the east-west fracture is very obvious. According to the seepage characteristics of fractures in different directions, linear injection, dynamic deployment of water, periodic water injection, inter-staged injection, and shut-in of well with high water cut wells are adopted to further improve the injection-production system, which can effectively improve the water injection development effect.