摘要
针对大庆油田清配污稀聚驱区块普遍存在污水矿化度高、体系黏度保留率低、聚合物用量大的问题,开展了抗盐聚合物的室内筛选评价工作,优选出LH2500新型抗盐聚合物,并在杏六区中部3号站投入矿场试验。由于LH2500新型抗盐聚合物分子线性度高,其增黏性、抗盐性和抗吸附性强于普通聚合物,动态变化特征与普通聚驱存在较大差异。依据大庆油田首个抗盐聚驱现场试验的开发过程,研究抗盐聚驱动态变化特征。结果表明,LH2500新型抗盐聚合物具有较强的注入能力,对中低渗透层改善效果更明显,较普通聚驱见效快;中心井最大含水降幅高达19.8%,高于普通聚驱5.4个百分点,含水低值期长达18个月;在注入0.854PV时,试验区提高采收率达到15.54个百分点,预计最终可提高采收率达到18个百分点,高于清配清稀普通聚驱4.63个百分点。
High salinity of re-injected water, low retention rate of polymer injection system ′ s viscosity and high dosage of polymer prevail in polymer-flooding blocks,where polymer solution is prepared with clean water and diluted with re-injected water,in Daqing Oilfield.Aimed at these conditions,laboratory screening and evaluation of salt-resistant polymers have been conducted.New-type LH2500 salt-resistant polymer was finally picked out and applied in the field test at 3# Station in the middle of Block Xing Six.This type of polymer is characterized by high molecular linearity as well as enhanced viscosity,salt-resistance and absorbability,which makes it quite different from ordinary polymers in production response and its features.Dynamic charac-teristics of the salt-resistant polymer flooding were researched according to the development process of the first field test of the salt-resistant polymer flooding in Daqing Oilfield.The results show that LH2500 has high injection capability.Besides,it is able to improve the producing condition of the low and medium permeability reservoirs more obviously.Compared with ordinary polymers,it has quicker response.The maximum water cut decline of center wells is up to 19.8%,which is 5.4 percent higher than that by ordinary polymer and the period with low water cut is long for 18 months.At last,numerical simulation was engaged to calibrate the oil recovery factor of salt-resistant polymer flooding,which is 15.54 percent higher than that of water flooding when 0.854 PV was injected,and 4.63 percent higher than that of the ordinary polymer flooding whose polymer solution is prepared with clean water and diluted with re-injected water.Ultimate recovery percent may be enhanced by 18%.
作者
王雪艳
Wang Xueyan(Research Institute of Oil Production Engineering,Daqing Oilfield Co. ,Ltd. ,Daqing Heilongjiang 163400)
出处
《中外能源》
CAS
2018年第6期52-55,共4页
Sino-Global Energy
关键词
清配污稀聚驱
抗盐聚合物
室内筛选
矿场试验
polymer solution prepared with clean water and diluted with re-injected water
salt-resistant polymer
laboratory screening
field test
