砂砾岩油藏水平井选择性堵水剂研究及矿场试验  

Research and Oilfield Trial of Selective Water Shutoff Agent for Horizontal Well in Glutenite Oil Reservoir

作　　者：李宜坤[1] 党杨斌 关超[3] 才程[1] 牛壮 程涛[2] 黎兴文 崔浪[3] LI Yikun;DANG Yangbin;GUAN Chao;CAI Cheng;NIU Zhuang;CHENG Tao;LI Xingwen;CUI Lang(Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,P R of China;Drilling and Production Technology Research Institute of Qinghai Oilfield,PetroChina,Dunhuang,Gansu 736202,P R of China;The 2nd Oil Production Plant of Qinghai Oilfield,PetroChina,Mangya,Qinghai 816400,P R of China)

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]青海油田钻采工艺研究院,甘肃敦煌736202 [3]青海油田采油二厂,青海茫崖816400

出　　处：《油田化学》2022年第1期64-68,81,共6页Oilfield Chemistry

基　　金：中国石油天然气股份有限公司重大科技专项“柴达木盆地建设高原大油气田勘探开发关键技术研究与应用”(项目编号2016E-01)。

摘　　要：昆北油田砂砾岩储层厚度大,平面、层间、层内非均质性强,开发初期水平井即表现出产量递减大、含水上升快的特点,迫切需要治水。基于该油藏特征及开发生产特点,以丙烯酰胺、2-丙烯酰胺基-2-甲基丙磺酸和二甲基二烯丙基氯化铵为原料,制备了三元共聚物水平井选择性堵水剂。研究了交联剂N,N-亚甲基双丙烯酰胺对堵水剂强度和溶胀率的影响,考察了堵水剂的注入性能和封堵能力。在室内研究和矿场生产特征分析的基础上,在昆北油田开展了6口水平井堵水矿场试验。结果表明,交联剂加量对堵水剂强度和溶胀率的影响较大。交联剂加量为单体总质量的1.5%时,形成的堵水剂强度适中,可进行拉伸,溶胀率达到最高。堵水剂平均粒径为420μm,可在昆北储层裂缝中形成有效堵塞。填砂管注入堵水剂后,后续水驱注入压力提高了5.06倍,水驱封堵率为83.5%,油驱封堵率为20%,油水选择性良好。堵水剂在昆北油田进行了现场应用,增油降水效果较好。The glutenite formation of Kunbei oilfield has large thickness and severe heterogeneity in planar direction,inter-layer and intra-layer.In the early stage of development,the horizontal wells show the characteristics of high decline of production and rapid rise of water cut,so water control is urgently needed. Based on the reservoir features and wells production performances,theterpolymer was prepared using acrylamide,2-acrylamide-2-methylpropanesulfonic acid and dimethyldiallyl ammonium chloride forselective water shutoff in horizontal well. The effects of crosslinking agent N,N- methylene bisacrylamide on the strength andswelling rate of water shutoff agent were studied. The injection performance and plugging ability of water shutoff agent wereinvestigated. On the basis of laboratory experiment and well performance,the oilfield trials of water shutoff for 6 horizontal wellswere carried out in Kunbei oilfield. The experiment results showed that the amount of crosslinking agent had great influence on thestrength and swelling rate of water shutoff agent. When the dosage of crosslinking agent was 1.5% of the total mass of monomer,the strength of water shutoff agent was moderate. It could be stretched,and the swelling rate reached the highest. The average sizeof water shutoff agent particle was 420 μm,which could form effective plugging in the fracture of Kunbei reservoir. After injectingwater shutoff agent into sandpack column,the injection pressure of subsequent water flooding increased by 5.06 times,and theplugging rate of water flooding was 83.5% and that of oil flooding was 20%,showing a good selectivity to oil and water. The watershutoff agent was applied in Kunbei oilfield and the remarkable effect of increasing oil and reducing water was gained.

关 键 词：砂砾岩油藏 水平井 三元共聚物 堵水剂 昆北油田 

分 类 号：TE358[石油与天然气工程—油气田开发工程]