Formulation of High Temperature Gas-Kick Preventer and Its Mechanism of Blocking Gas Cut
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摘要: 在高温储层钻井作业中，油气侵入井筒，易引发溢流甚至井喷等复杂事故。传统聚合物凝胶虽可防止气窜，但却存在抗温性能不足的问题。选用耐温聚合物AP-9、交联剂（聚乙烯亚胺和柠檬酸铝按1∶1）和硫脲制备耐高温气滞塞体系，通过实验探究各组分用量对气滞塞体系热稳定性的影响，优选出最佳配方（0.5%聚合物AP-9+0.4%交联剂+0.25%硫脲）。实验结果表明，该耐高温气滞塞体系在160℃高温下，使用25 000 mg/L Na+盐水配制的凝胶成胶后黏度为7120 mPa·s，抗盐性能良好，加热72 h后的黏度仍然可达3328 mPa·s，承压强度0.23 MPa/m。该研究为高温井环境中有效密封井下油气提供了技术支持，有助于实现全过程欠平衡钻井作业，对提高钻井安全性和效率具有重要意义。Abstract: In high temperature reservoir operations, oil/gas cut causes drilling accidents such as well kick and even well blowout. Conventional polymer gels, though can be used to prevent gas channeling from occurring, have poor high temperature resistance. In this study, a high temperature gas-kick preventer was prepared using a high temperature polymer AP-9, a crosslinking agent (polyethyleneimine and aluminum citrate in a ratio of 1∶1) and thiourea. Laboratory experiments were conducted to find the effect of the concentration of each component on the thermostability of the high temperature gas-kick preventer. As a result of the experiments, an optimal composition was determined as: 0.5%AP-9+0.4% crosslinking agent+0.25% thiourea. Laboratory evaluation results show that at 160℃ a gel formulated with 25 000 mg/L Na+ saltwater and the high temperature gas-kick preventer has viscosity of 7120 mPa·s after gelling, indicating that the high temperature gas-kick preventer has good salt resistance. After heating for 72 h, the viscosity of the saltwater gel still reaches 3328 mPa·s, and the pressure bearing strength of the saltwater gel is 0.23 MPa/m. The results of this study provide a technical support for effectively preventing gas kick in a high temperature well, they are helpful for achieving whole-process underbalanced drilling, and are of great importance to improving the safety and efficiency of drilling operation.
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