各向异性油藏定向井表皮因子计算方法研究

为了研究定向井近井地带储层渗流规律对表皮因子的影响，采用坐标变换方法将渗透率各向异性介质转换为各向同性介质，建立了适应于各向异性油藏任意井眼轨迹的定向井裸眼完井表皮因子计算模型。在此基础上，应用该模型研究了由于井斜和储层污染产生的表皮因子随井斜角、方位角的变化规律。计算分析表明：在各向异性油藏中，定向井的井眼轨迹对表皮因子具有重要影响。井斜角的减小会导致井斜产生的表皮因子增加，而井斜角、方位角的减小均会导致储层污染产生的表皮因子增加。该模型适用范围广泛，能够为进一步研究定向井的产能提供依据。

SKIN FACTOR COMPUTATION METHOD FOR DIRECTIONAL WELL IN ANISOTROPIC RESERVOIR

A computation model for calculating the skin factor of directional wells in the anisotropic reservoir is developed based on the theory of coordination conversion in order to study the influence of the law of flow on skin factor. Based on this model, the skin factor caused by well deviation and formation damage varying with deviation angle and azimuth angle is studied. It is found that the well bore track of directional well plays an important role on skin factor in the anisotropic reservoir. The decrease of deviation angle will result in the increase of skin factor caused by well deviation. The decrease of deviation or azimuth angle will result in the increase of skin factor caused by formation damage. This model has wide applicability and may provide some information for studying the productivity of directional well.