水平井挖掘正韵律厚油层潜力影响因素分析

Influence factors for tapping positive rhythm thick oil reservoir potential with horizontal wells

用整装油藏资料建立了正韵律厚油层的概念模型,对水平井挖掘厚油层潜力的影响因素和技术参数界限进行了分析。研究结果表明,为提高油藏采收率,水平井注采井组中注水直井在上部注水效果较好;地层垂向渗透率应保持一个最佳值;无因次隔层面积最好大于6.9。采用水平井挖潜,无因次水平段长度应大于0.25;剩余油富集地层厚度应大于4.3m;厚油层整体含水率应低于95%;生产压差和产液速度应保持合理水平。

A concept model of positive rhythm thick oil reservoir was built by integrity reservoir data, by which, influence factors and technique parameters limit for tapping thick oil reservoir potential with horizontal wells were analyzed. The results show that, in order to enhance oil recovery, the best injection location of vertical injection wells in horizontal wells injection-production pattern is on the top. The vertical permeability should be kept the reasonable value and the dimensionless interlayer area should be greater than 6.9. When the horizontal wells are practiced, the dimensionless horizontal hole length should be greater than 0.25 and the oil reservoir thickness where residual oil concentration should be greater than 4.3 m. Moreover, the water cut should be less than 95 percent, and the producing pressure drop and producing liquid rate should be held on reasonable level.