低孔低渗稠油油藏注水增能效果影响因素  

Factors Influencing Water Injection Effect in Low Porosity and Low Permeability Heavy Oil Reservoirs

作　　者：万海乔 王盛 刘学良 WAN Haiqiao;WANG Sheng;LIU Xueliang(Lukeqin Oil Production Management Area,Tuha Oilfield Company,PetroChina,Hami,Xinjiang 839000,China)

机构地区：[1]中国石油吐哈油田分公司鲁克沁采油管理区,新疆哈密839000

出　　处：《新疆石油地质》2023年第3期347-351,共5页Xinjiang Petroleum Geology

基　　金：中国石油科技重大专项(2017E-0409)。

摘　　要：吐哈盆地鲁克沁油田二叠系发育低孔低渗砂砾岩稠油油藏,由于储集层物性差,非均质性强,自然产能低,压裂投产后,注水开发效果较差。为了解决平面矛盾突出、见效率低、欠注区域不见效的开发矛盾,实施注水增能提高单井产量,但单井增产效果差异较大。为此,通过室内物理模拟实验,对储集层润湿性和注水增能过程进行了研究。结果表明,吐哈盆地鲁克沁油田二叠系储集层具亲水性,压裂有利于裂缝与储集层基质发生渗吸作用,可有效补充地层能量,从而提高单井产量;注入速度越快,地层能量恢复越快;焖井压力越高,增油量越高。通过数值模拟,并结合现场情况,优化注入参数,注水增能效果较好,措施有效率达88%。Low porosity and low permeability sandy conglomerate heavy oil reservoirs in the Permian series of the Lukeqin oilfield in Tur-pan-Hami basin are usually fractured for recovery due to their poor physical properties,strong heterogeneity and low natural productivity.The induced fractures and reservoir heterogeneity lead to poor water injection effect.In order to solve the problems encountered in the de-velopment such as prominent areal contradiction,low efficiency,and ineffective areas,water injection is used to replenish the formation en-ergy for increasing single-well production,but the effect in single wells is quite different.The reservoir wettability and water injection pro-cess for energy replenishment were studied through physical simulation experiments.The results show that the Permian reservoirs in the Lukeqin oilfield are water-wetting.Fracturing is conducive to the imbibition between fractures and reservoir matrix,which can effectively replenish the formation energy to improve single-well production.The faster the water is injected,the faster the formation energy can be re-covered;the higher the well soaking pressure,the higher the oil increment.Combining numerical simulation and in-situ conditions,the in-jection parameters were optimized.As a result,the effect of water injection was good,with the effective rate reaching 88%.

关 键 词：吐哈盆地 鲁克沁油田 二叠系 低孔低渗 砂砾岩 稠油油藏 注水增能 影响因素 

分 类 号：TE341[石油与天然气工程—油气田开发工程]