小分子支链化聚合物压裂液的合成与应用

Synthesis and Application of Branched Small Molecular Polymer Fracturing Fluid

采用氧化还原引发体系，以AM、AMPS为主要原料，以硫酯YP为链转移剂和支链化促进剂，合成得出特性黏数不高于3．0的小分子支链化聚合物增稠剂。在室内大量研究的基础上，得到了小分子支链化聚合物压裂液增稠剂的最佳合成工艺；并同时研制出了与之匹配的专用交联剂、缓交剂、温度稳定剂、助排剂及其破胶剂。该体系的耐温抗剪切能力可达140℃。经辽河油田10口中深井和松原油田30口中深井的应用，证明了该体系专用破胶剂在少量常规氧化破胶剂的协同作用下可使低温到高温（40～100℃）的压裂液破胶水化彻底，大大降低了对改造储集层的伤害，压裂施工成功率为100％，取得了良好的效果。

Small molecules branched polymeric thickener with the intrinsic viscosity no higher than 3.0 is synthesized in redox initiator system,in which AM,AMPS as the main raw materials and Sulphur ester YP as the Chain transfer agent and branched accelerator.The best synthesis process,crosslinking agents,defer agent,temperature stabilizer,cleanup additives and gel breaker are developed in laboratory experiment.This type of fracturing fluid' shear resistance temperature can reach 140℃. The application on medium-deep wells in Liaohe and Songyuan Oilfields proved that gel breaker cooperate with conventional oxidation gel breaker can destroy the gel completely in the temperature range of 40-100℃.This technique can reduce the harm to reservoir and has 100%rate of success.