致密厚油层斜井多段压裂技术

Multi-stage fracturing technique in deviated wells of tight thick oil reservoirs

杜现飞 李建山 齐银 陆红军 王成旺 殷桂琴

DU Xianfei LI Jianshan QI Yin LU Hongjun WANG Chengwang YIN Guiqin

长庆油田公司超低渗透油藏研究中心，陕西西安　710018

Super-low Peameability Research Center, Changqing Oil.eld Co., Xi’an 710018, China

华庆油田长 6储层属典型致密油藏，油层厚度 30~60 m，渗透率在 0.3 mD左右，纵向非均质性强。为进一步提高单井产量，利用丛式大井组布井井斜度大、井眼穿透油层厚度大等有利条件，提出了致密厚油层斜井多段压裂技术，在油层内造多缝扩大泄流体积提高单井产量。绘制了斜井多段压裂选井条件模版，明确了纵向上形成多条独立裂缝的单井井斜角和井眼方位角的具体条件。通过压力拟合、 DSI偶极声波测井等分析手段，证实了斜井多段压裂可以提高致密厚油层改造体积，单井产量较对比井高 0.8 t/d左右，是致密厚油层增产的有效途径之一。

Zone Chang6 of Huaqing oilfield a typical tight reservoir with the pay thickness of 30-60m and permeability of nearly 0.3mD, and is characterized by serious heterogeneity in vertical. In order to enhance single well production, multi-stage fracturing technique in deviated wells of tight thick oil reservoirs was proposed based on the favorable conditions that cluster wells could have high deviation and the borehole could penetrate layers that thick enough. This technique could form network which increase oil drain-age volume and then enhance the single well production. Well selection template for multi-stage fracturing in deviated wells was drawn and the specific conditions for deviation angle and azimuth of single well were illustrated to cause team independent fractures. Through analyzing the pressure fitting and DSI logging, results confirm that multi-stage fracturing in deviated wells could improve the effect of volume fracturing in tight thick oil reservoirs. The single well output is 0.8 t/d over than that of the corresponding well. Multi-stage fracturing technique in deviated wells is one of the effective stimulation means.