单液法硅酸凝胶堵水剂FH-01研究及其应用  

Silicic Acid Gelling Composition FH-01 as Single-Fluid Water Shutoff Agent and Its Uses

作　　者：陈辉[1] 

机构地区：[1]中国石化胜利油田分公司孤岛采油厂,山东东营257231

出　　处：《油田化学》2008年第3期218-220,共3页Oilfield Chemistry

摘　　要：所报道的单液法硅酸凝胶堵水剂FH-01，由75％～95％水玻璃、0．9％～1．05％复合电解质胶凝剂，8％～12．5％包覆剂组成，常温下为淡黄色液体，在地层条件下经10～15小时固化。简介了硅酸钠在氢离子作用下生成单硅酸，再聚合成多聚硅酸并形成凝胶的原理。将有效成分含量30％的堵剂0．3PV注入渗透率分别为3、2、1μm^2的孤岛油田产出砂填充管，在70℃固化后封堵率达92．9％、93．6％、95．7％，堵剂有效成分含量增大时封堵率增大，注入并联高、低渗（3．1和0．95μm^2）填砂管时，使分流率由90％和10％变为30％和70％。在孤岛中二北馆5单元的4口经多轮次蒸汽吞吐的热采井中，将该堵剂放置于距井眼6m的近井地带，平均单井用量110m^3，关井候凝后开井生产，产出液含水由94．3％～96．5％降至69．2％～88．5％，周期产油量大幅增加。图1表2参2。The gelling composition FH-01 for water shutoff by using single-fluid injection technology is composed of 75-95 % sodium silicates, or water glass, 0. 9-1. 05 % mixed electrolytes as gelatinizer, and 8-12.5% encapsulator and, being an yellowish liquid, converts to a gel under reservoir conditions in 10-15 hrs. The formation of silicic acid from sodium silicates at the presence of H^＋ and its polymerization and gelation are discussed shortly. The packs of Gudao reservoir sand with permeability 3,2, and 1μm^2 are treated with 0.3 PV of 30 % gelling composition and then cured at 70℃ to give a plugging rate of 92.9 %, 93.6 %, and 95.7 %, respectively, and the value determined increases with increasing content of active substances in the gelling composition used; injecting 0.3 PV of 30% gelling composition into two sand packs of higher and lower permeability, 3.1 and 0.95 μm^2, in parallel causes their partial flowrate ratio Changing from 90/10 to some 30/70. At unit No 5, Guantao Formation, northern central district Ⅱ, Gudao, Shengli, this water shutoff gelling composition in average volume of 110 m^3 per well was emplaced and cured in near bore zones 6 meters apart from the bore hole in 4 thermally producing wells, which had undergo multiple steam huffing-puffing cycles, and resulted in notably lowering down the water content of the produced fluids from 94.3--96.5 % to 69.2--88.5 % and in signifcantly raising the oil output from the treated wells in the following oil recovery period.

关 键 词：硅酸凝胶 堵水剂 单液法 组成与配方 岩心封堵性能 堵水 近井地带 蒸汽吞吐井 胜利孤岛油田 

分 类 号：TE358.3[石油与天然气工程—油气田开发工程] TE39