低渗透裂缝性油藏复合深部调驱技术研究与应用

Study and Application of Deep Profile Modification Technology in Low-permeability Fractured Reservoir

长庆油田盘古梁长6油藏属于低渗透裂缝性油藏,严重影响到水驱油波及效率。针对该油藏地质特征和见水状况,研制了预交联颗粒/水驱流向改变剂/聚合物弱凝胶复合深部调驱体系,其中预交联颗粒/水驱流向改变剂具有较高的膨胀率,发挥了深部调剖作用,有效封堵大裂缝出水通道;聚合物弱凝胶主要发挥了驱油作用,有效启动中小裂缝中剩余油。利用该调驱体系在两井组进行了矿场应用,结果两井组在14和15个月中分别增油3564.38t和3801.00t。

According to the geologic feature and waterflood performance of low-permeability fractured reservoir in Panguliang Chang-6 reservoir of Changqing Oil Field, a compound deep profile modification system composed of pre-crosslinked particle/waterfleod fluid diversion agent/polymer gel was prepared. Pre-crosslinked particle and waterflood fluid diversion agent had a high expansion ratio and played a role to plug big fractured water paths. The polymer gel played a role to displace residual oil in medium or small fractures effectively. The technology was used in Well Pan59-28 and Wall Pan49-28 and the oil yield increased 3 564t in 14 months and 3801t in 16 months respeetively.