低渗透油藏注水开发储层动态特征变化  

Reservoir Characteristics Changes in Waterflooding Development

作　　者：曹宝格 韩永林 余永进 肖玲 CAO Bao-ge;HAN Yong-lin;YU Yong-jin;XIAO Ling(Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil&Gas Reservoirs,Petroleum Engineering Institute,Xi’an Shiyou University,Xi’an 710065,China;Changqing Oilfield No.2 Production Plant,Qingcheng 745106,China;School of Earth Sciences and Engineering,Xi’an Shiyou University,Xi’an 710065,China)

机构地区：[1]西安石油大学陕西省油气田特种增产技术重点实验室,石油工程学院,西安710065 [2]长庆油田分公司采油二厂,庆城745106 [3]西安石油大学地球科学与工程学院,西安710065

出　　处：《科学技术与工程》2020年第5期1820-1825,共6页Science Technology and Engineering

基　　金：陕西省重点研发计划项目(2018KW-037)。

摘　　要：为了解低渗透油藏长期注水后储层特征的变化及其机理,以马岭油田南二区延9油藏为例,通过室内物理模拟实验法研究注水开发前后储层物性、孔隙特征和渗流特征的变化。研究结果表明:长期注水后,储层渗透率明显增大,孔隙度增加较小,且储层渗透率越高,水洗程度越大,储层物性的增加幅度越大;储层物性的增加主要与水洗后黏土矿物含量的降低有关,其中伊利石和伊蒙混层的相对含量明显降低,高岭石相对含量明显增大;水洗后储层岩石表面油膜脱落,岩石润湿性由亲油性变为亲水性;注入水与储层岩石的相互作用使油水相流动能力增强,两相区范围变宽,水驱油效率提高。可见马岭油田南二区延9油藏注水开发中储层的变化有利于油田的开发。In order to understand the changes of reservoir characteristics and its mechanism after long-term water injection in low permeability reservoir,by taking Yan 9 reservoir in Nan 2 District of Maling Oilfield as an example,the changes of reservoir physical properties,pore characteristics and seepage characteristics were studied by using indoor physical simulation.Results show that,after long-term water injection,the permeability of reservoir is obviously increased,porosity is increased,and the permeability of reservoir is higher and the displacement degree is greater,and the increase of reservoir property is larger.The increase of reservoir property is mainly related to the decrease of clay mineral content after washing,in which the relative content of illite and illite/smectite formation is obviously decreased,and the relative content of kaolinite is obviously increased.After washing,the oil film on the surface of reservoir rock falls off,and the wettability of the rock changes from the hydrophilic to hydrophilic.The interaction between the injected water and the rock of the reservoir makes the oil-water phase flow capacity increase,the scope of the two-phase zone becomes wider,and the water displacement efficiency increases,which is beneficial to the development of the oil field.It can be seen that the changes of reservoir in the water injection development of Yan 9 reservoir in Nan2 District of Ma-ling Oilfield is beneficial to the development of oil fields.

关 键 词：储层物性 黏土矿物 润湿性 相对渗透率 

分 类 号：TE331.3[石油与天然气工程—油气田开发工程]