摘要
聚合物解堵剂DOC-8已用于孤岛渤19注聚试验区注交联聚合物（弱凝胶）引起的地层堵塞。该剂为粒状，由强氧化剂过氧化钙（Ⅰ）和辅剂亚氨酸钠（Ⅱ），柠檬酸（Ⅲ）组成，其中Ⅰ与Ⅱ质量比为92：8，用清水或油田污水配咸水溶液使用，最佳组成为1％Ⅰ＋3％Ⅲ＋Ⅱ，此即1％DOC-8解堵液。1％DOC-8解堵液与HPAM／C2^3＋凝胶在〉55℃以上反应〉5小时，凝胶中的HPAM完全降解，生成低黏度水溶液，借用标准规定的黏度法测反应液中HPAM分子量，求得降解率接近完全。DOC-8水溶液pH为7～9，腐蚀速率随浓度升高而降低，1％溶液为0．8564g／m^2。ha在含油的85％石英＋15％黏土填砂管流动实验中，注入HPAM／C2^3＋溶液并成胶后造成约41％的渗透率伤害，用1％DOC-8解堵液处理，进入深度达到岩心长度1／2时，渗透率恢复率63％；在填砂管前置入注聚水井凝胶堵塞物使渗透率下降57％，分五轮次用DOC-8＋JCN-006（低伤害酸液）处理，进入深度达到岩心长度1／2时，渗透率恢复率达95％。图4表6参2。
A polymer blockage remover, DOC-8, has been put into use in polymer flood trial district Bo-19 of Gudao, Shengli, for removing reservoir blockages created by crosslinked polymer gel.DOC-8 is a granulated material composed of strong oxidizer CaO2 and auxiliaries NaClO2 and citric acid with CaO2 to NaC1O2 mass ratio 92： 8 and is used in solution of fresh or oilfield produced water with an optimal recept 1% CaO2 ＋ 3 % NaC1O2 ＋ citric acid, 1% DOC-8 solution in short. When 1% DOC-8 solution and an HPAM/ Cr^3＋ flowing gel in equal volume are reacted at 〉55℃ in 〉5 hrs, the HPAM in the gel can be completed degradaded to give a low viscous solution, as shown by HPAM molecular mass determinations in the reaction mixmres by a standard viscosimetric method. Aqueous solutions of DOC-8 have pH values 7-9 and a low corrosion rate of 0.8564 g/m^2· h is observed for 1% DOC-8 solution, being deereased with increasing DOC-8 concentration. In core flow experiments on oil bearing sand packs containing 85 % quartz and 15 clay, cross, llnked polymer gel treatment causes 41% permeability damage and 1% DOC-8 solution treatment leads to 63% permeability recovery when DOC-8 reaching 1/2 core depth; placing gelatinous masses blockaged in production wells in front of the sand packs causes 57% permeability damage and a treatment by DOC-8＋JCN-006 （a low damageing acidizing fluid） in 5 cycles and reaching 1/2 core depth leads to 95% permeability recovery.
出处
《油田化学》
CAS
CSCD
北大核心
2006年第1期77-80,共4页
Oilfield Chemistry
关键词
解堵剂
过氧化钙(CaO2)
配方研究
聚合物(凝胶)堵塞
应用性能
注聚水井
解堵
胜利孤岛油田
blockages remover
calcium peroxide （CaO2）
formulations
（gelled） polymer blockages
performance properties
polymer/water injection wells
blockages relieving
Gudao oil fields in Shengli
