底水稠油油藏水平井见水特征及影响因素

Water Breakthrough Characteristics and Influence Factors of Horizontal Well in Heavy Oil Reservoir with Bottom Water

针对XH 27块大底水稠油油藏水平井含水上升快,产量降幅大的问题,利用角点网格、随机建模方法建立了相控地质模型,进行了历史拟合,根据含水率、水油比及水油比导数曲线特征提出了三种水平井见水类型,明确了不同见水类型的水淹特征。研究了水平井无因次避水高度、水平段长度、渗透率各向异性、油层厚度等因素对水平井水淹规律的影响,利用正交试验方法确定不同因素的影响程度。结果表明,底水稠油油藏水平井设计参数对累积产油量影响程度由高到低依次为无因次避水高度、采液强度、水平段长度,研究结果对同类油藏水平井部署设计有参考意义。

Facing such problem as rapid increase of water cut and production decline of horizontal wells in Block XH27,which is a heavy oil reservoir with bottom water,established is a facies-restrained reservoir model by means of corner-point grid and stochastic modeling method to conduct history matching.Studied are three types of water breakthrough in horizontal wells according to the characters of water cut,water/oil ratio and its derivative curves and clarified are characteristics of different types of water breakthrough.Analyzed are influences of such factors as dimensionless water avoidance height of horizontal well,well length,permeability anisotropy and reservoir thickness on water breakthrough of horizontal wells and influence degree of different factors are determined by using the orthogonal experiment method.The results show that the successive order of factors affecting the cumulative oil production is dimensionless water avoidance height,fluid producing intensity and length of horizontal well,which can provide valuable reference for similar reservoir horizontal well deployment.