摘要
在埕东油田西区南块整体堵水中使用了示踪剂。从示踪剂的性质、分析方法和仪器、货源、价格等方面考虑,选择CNS^-,SO^(2-)_4和Cl^-作为示踪剂。本文对示踪剂水样的预处理和分析,示踪剂的投放和取样,示踪剂在描述地层、评价堵水效果和判别地层有无裂缝或高渗透层存在等方面的应用作了介绍。
Tracers had been extensively used in operations of the complex watershutoff programme already pertormed in Southwestern Chengdong Oilfield, Shengli, as a whole. Taken into consideration the characteristies, analytical and instrumental aspects, supplies and prices of tracers, SCN^-, SO^(2-)_4 and Cl^-were preferred to others and selected for use in this progtame: CNS^- as NaCNS solution, SO^(2-)_4 as FeSO_4 solution, the 2nd reaction solution of double-fluid precipitating profile-controller, and Cl^- as salt marsh were introduced into water injection wells. On the time schedules predetermined water samples were collected systematically from corresponding producing wells and then analysed for the tracing ions after necessary deoil pretreatment. The tracers had been used in Southwestern Chengdong Oilfield for reservoir deseription, for evaluating the effeetiveness of plugging operations, and for displaying interwell fractures or high permeability zones in formations. After such fractures or zones having been examined by the tracers, watershutoff operations with different plugging agents were performed three times at the same injection well but only the last one led to a little success: the HPAM in plugging agent reached the corresponding producing well 7 days later than before.
出处
《油田化学》
CAS
CSCD
北大核心
1991年第2期124-131,共8页
Oilfield Chemistry
