渤海P油田疏松砂岩储层敏感性实验研究及评价  

Experimental Study and Evaluation on Sensitivity of Loose Sandstone Reservoir in Bohai P Oilfield

作　　者：暴赫 侯亚伟 王刚 安玉华 范佳乐 BAO He;HOU Yawei;WANG Gang;AN Yuhua;FAN Jiale(CNOOC(China)Co.,Ltd.,Tianjin Branch,Tianjin 300452,China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300452

出　　处：《当代化工》2024年第9期2147-2151,共5页Contemporary Chemical Industry

基　　金：“十四五”重大科技专项“海上油田大幅度提高采收率关键技术”课题项目(项目编号:KJGG2021-0501);中国海油重大科技专项课题项目(项目编号:CNOOC-KJ 135ZDXM36TJ01TJ)。

摘　　要：渤海P油田在开发中后期由于长期注水导致地层内部结构发生变化,加剧储层内部优势通道,而对于储层物性在水驱和酸化措施后的变化规律缺乏系统性的认识。因此,用现场实际岩心开展了储层水敏/盐敏性实验、酸敏/碱敏性实验,以得到储层在接触不同矿化度流体时物性的变化规律。结果表明:渤海P油田水敏/盐敏损害程度为中等偏弱-中等偏强,入井流体矿化度>20 000 mg·L^(-1),为预防黏土发生微粒运移,在注水初期可适当增加黏土稳定剂;酸敏损害率为11.0%~49.1%,伤害程度为弱-中等偏弱;碱敏损害率为25.2%~69.1%,伤害程度为弱-中等偏弱,入井流体的临界pH为8.5,油井酸化后,在投产初期尽量避免高压差生产,降低可移动微粒对储层孔喉的堵塞,提高酸化有效期。研究成果可为渤海P油田开发政策调整和提高储量动用程度提供理论指导。In the middle and later stages of development,Bohai P oilfield experienced changes in the internal structure of the formation due to long-term water injection,exacerbating the dominant channels within the reservoir.However,there is a lack of systematic understanding of the changes in reservoir physical properties after water flooding and acidification measures.Therefore,reservoir water sensitivity/salt sensitivity experiments and acid sensitivity/alkali sensitivity experiments were conducted based on on-site actual rock cores to obtain the changes in physical properties of the reservoir when exposed to fluids with different mineralization degrees.The results showed that the degree of water/salt sensitivity damage in Bohai P oilfield was moderate-weak to moderate-strong,with the mineralization degree of the fluid entering the well>20000 mg·L^(-1).To prevent particle migration of clay,clay stabilizers could be appropriately added in the early stage of water injection;the acid sensitivity damage rate ranged from 11.0%to 49.1%,and the degree of damage was weak to moderate-weak;the alkali sensitivity damage rate ranged from 25.2%to 69.1%,and the degree of damage was weak to medium-weak.The critical pH of the fluid entering the well was 8.5.After acidizing the oil well,try to avoid high-pressure differential production in the initial stage of production,reduce the blockage of movable particles on the reservoir pore throat,and improve the acidizing validity period.The research results can provide theoretical guidance for adjusting the development policy of Bohai P oilfield and improving the degree of reserve utilization.

关 键 词：储层渗透率 酸化 储层敏感性 化学防砂 流体矿化度 PH 

分 类 号：TQ047[化学工程] TE341[石油与天然气工程—油气田开发工程]