新型天然气水合物动力学抑制剂的研制与性能评价  

Development and performance evaluation of a new kinetic hydrate inhibitor

作　　者：刘书杰[1,2] 李相方[1] 邢希金 周建良 

机构地区：[1]中国石油大学(北京),北京102249 [2]中海油研究总院,北京100028

出　　处：《中国海上油气》2015年第6期69-73,共5页China Offshore Oil and Gas

基　　金："十二五"国家科技重大专项"海外典型油田厚盐岩层钻井液体系研究(编号:2011ZX05030-005-07)"部分研究成果

摘　　要：针对水合物热力学抑制剂存在的用量大、成本高、环境污染以及现有的水合物动力学抑制剂在高过冷度下抑制作用失效的问题,通过分子结构优化设计,研制了新型水合物动力学抑制剂KHI-S。利用水合物抑制剂评价实验设备,模拟评价了深水钻井高过冷度条件(30 MPa、2℃)下KHI-S抑制水合物生成效果,并分析了其在深水水基钻井液中的配伍性。结果表明,KHI-S可有效延长甲烷水合物生成诱导时间,加入1.0%KHI-S可将膨润土浆中水合物生成诱导时间从1.0 h延长至6.7 h;在相同加量下,KHI-S试液中水合物生成诱导时间是典型水合物抑制剂PVCL的近2倍;1.0%KHI-S与10%NaCl组成的组合抑制剂可使钻井液搅拌12 h无水合物生成;KHI-S在深水钻井液中具有良好的配伍性,可满足深水钻井的基本要求。In view of the large consumption, high cost, environmental pollution of the thermodynamic hy- drate inhibitors, and the poor performance of kinetic hydrate inhibitors under high degree of subcooling, a new kinetic hydrate inhibitor named KHI-S was developed based on the optimized design of polymer molecular structure. With the lab equipment for the performance tests of hydrate inhibitors, the inhibition performance of KHI-S was tested under high degree of subcooling condition （30 MPa, 2~C） simulating deep water drilling, and the compatibility of KHI-S in deep water drilling fluids was also examined. The results show that KHI-S can extend the induction time of methane hydrate formation effectively. The induction time is increased from 1.0 h to 6.7 h with a dosage of 1.0% KHI-S in bentonite mud. At the same concen- tration, the induction time with KHI-S is nearly twice that with PVCL, a typical hydrate inhibitor. The combination of 1.0% KHI-S and 10% NaCl can prevent hydrate formation for at least 12 h under agita- tion. In addition, KHI-S is compatible with other additives in deep water drilling fluids, meeting the basic requirements of field application.

关 键 词：深水钻井 钻井液 水合物 动力学抑制剂 KHI-S 性能评价 

分 类 号：TE254[石油与天然气工程—油气井工程]