一种带压作业化学封堵材料的制备与评价

Synthesis and Evaluation of a Chemical Sealing Material for Snubbing Operation

潘 元 程 立 廖锐全 李 振 张康卫 袁 龙

PAN Yuan CHENG Li LIAO Ruiquan LI Zhen ZHANG Kangwei YUAN Long

为满足日益严峻的不压井（带压）作业对冻胶材料的要求，实验室采用聚丙烯酰胺（HPAM）、交联剂 Smel30、淀粉和促凝剂氯化铵为原料制备了一种适用性广、性能优良的带压作业封堵材料，研究了促凝剂、温度、 pH值、金属离子和模拟油对该凝胶体系成胶性能的影响，同时考察了凝胶的长期稳定性和破胶性能。研究结果 表明，基础配方为3%淀粉+0.5%交联剂Smel30+0.8%氯化铵+1% HPAM的凝胶体系的最佳使用pH范围为5～9， 尤其适用于弱碱性油藏；金属离子对其成胶时间和凝胶强度影响较小；通过调节促凝剂加量可以控制凝胶成胶 时间在6～20 h，且凝胶强度可达到J级；实验室条件下采用过硫酸铵破胶剂2 h内可实现有效破胶，破胶后胶液 的黏度降至300 mPa·s，便于返排。图7表4参16

In order to meet the increasingly severe snubbing operation environment，a kind of plugging material with wide applicability and excellent performance was prepared by using polyacrylamide（HPAM），cross-linking agent Smel 30，corn starch and ammonium chloride as raw materials in the laboratory. The effects of coagulant，temperature，pH value，metal ions and simulated oil on the gelling properties of the system were studied by rheological method. In addition，the stability and breakability of the gel was evaluated. The experimental results showed that the optimal pH range of the gel system，composed of 3% corn starch， 0.5% cross-linking agent Smel 30，0.8% ammonium chloride and 1% HPAM，was 5—9，which is especially suitable for weakly alkaline reservoirs；metal ions had little effect on gelation time and gel strength. The gelation time of the gel could be controlled at the range of 6—20 h by adjusting the amount of coagulant，and the gel strength of the obtained gel could reach J level. Under the laboratory conditions，the gel could be effectively broken with ammonium persulfate within 2 h. The viscosity of the gel-breakingfluid reduced to 300 mPa·s，indicating the gel was easy for flowback.

10.19346/j.cnki.1000-4092.2019.04.003