不压井作业封堵用高强度冻胶体系的室内性能评价

Performance Evaluation of High Strength Gel Used in Snubbing Service

程立 李振 廖锐全 张慢来 刘德基

CHENG Li LI Zhen LIAO Ruiquan ZHANG Manlai LIU Deji

为满足不压井作业对冻胶新材料的性能要求，以丙烯酰胺、甲基丙烯酸钠、耐高温胺类单体、过硫酸铵、聚合物LAH、交联剂MEN&PLE和增韧剂CAL等为原料制备了一种黏弹性冻胶，研究了引发剂和模拟油加量、无机盐、温度对胶液成胶时间和冻胶强度的影响，用高温高压稠化仪模拟地层条件对冻胶性能进行了室内评价。实验结果表明，在pH为7~13、反应温度为40~130℃的条件下可形成强度高达30 N的黏弹性聚合物冻胶体，承压能力达2 MPa/8 m；通过改变引发剂的加量可以调节胶液的成胶时间和冻胶强度；该冻胶稳定性好，具有较强的抗浸污能力，在模拟油加量高达20%或二价金属离子（Ca2+或Mg2+）为15×104 mg/L 的条件下，依然具有良好的成胶性能。图4 参16

In order to satisfy the performance requirements of gel material used in snubbing service，the viscoelastic polymer gel plugging system was developed using acrylamide，sodium methacrylate，heat-resistant amine monomer，ammonium persulfate，polymer LAH，crosslinking agent MEN&PLE and toughening agent CAL as raw materials. The effects of initiator，simulated oil，salt and reaction temperature on gelation time of liquid and strength of gel were investigated by employing the thicken tester of high temperature and high pressure which could simulate the real environmental strata well in laboratory. The experiment results showed that the high strength gel with the intensity up to 30 N and pressure capacity about 2 MPa/8 m formed in a wide range of pH 7—13 and reaction temperature 40—130℃. Meanwhile，the gelling time and gel strength could be adjusted by changing the dosage of initiator. The viscoelastic gel had good stability and strong contamination resistance. When the dosage of simulated oil was as high as 20% or the dosage of Ca2+ or Mg2+ was 15×104mg/L respectively，the gelling property of viscoelastic gel was good.

10.19346./j.cnki.1000-4092.2017.03.006