钻井液处理剂水合物分解抑制性实验研究  

Experimental study on the inhibition of hydrate decomposition by drilling fluid treatment agents

作　　者：张玉彬 ZHANG Yu-bin(SINOPEC Research Institute of Petroleum Engineering Co.,Ltd.,Beijing 102206,China)

机构地区：[1]中石化石油工程技术研究院有限公司,北京102206

出　　处：《应用化工》2024年第5期1076-1080,共5页Applied Chemical Industry

基　　金：国家重点研发计划(2022YFC2806405)。

摘　　要：分析了常规钻井液处理剂对水合物分解的影响规律,评价了不同抑制剂的水合物分解抑制性,优选了两种高效水合物分解抑制剂并探讨了其作用机理。结果表明,所选常规钻井液处理剂均表现一定的水合物分解抑制性,其中,XC对水合物分解的抑制作用最强,可将水合物分解时间延长21.9%;水合物分解时间与表观黏度呈良好的线性正相关性,相关系数(R^(2))>0.95;优选出聚乙烯基己内酰胺(PVCap)复合型产品和抗冻蛋白具有良好的水合物分解抑制效果,延缓率为97.3%和66.6%;PVCap七元环结构中的氧原子易与水合物表面的水分子形成氢键作用,在水合物晶核表面形成稳定笼型结构,大量的七元环吸附形成了一层包覆膜,削弱外部流体带来的传质、传热作用;抗冻蛋白通过氢键和疏水作用吸附到水合物表面,降低了水合物表面积,增加了外部流体向水合物表面传质、传热的阻力,从而延缓水合物分解。常用钻井液处理剂对水合物分解抑制的黏度效应和优选的两种高效水合物分解抑制剂可为水合物地层钻探提供钻井液技术支撑。The impact of conventional drilling fluid treatment agents on hydrate decomposition was analyzed,and the inhibition of hydrate decomposition by different inhibitors was evaluated.Two types of efficient hydrate decomposition inhibitors were selected and their mechanisms of action were explored.The results indicate that conventional drilling fluid treatment agents exhibit a certain degree of inhibition of hydrate decomposition,among which XC has the strongest inhibitory effect on hydrate decomposition,extending the hydrate decomposition time by 21.9%.There is a good linear positive correlation between the decomposition time of hydrates and the apparent viscosity,with a correlation coefficient R^(2)greater than 0.95.The polyvinylcaprolactam(PVCap)composite product and antifreeze protein were selected to have good hydrate decomposition inhibition effects,with a delay rate of 97.3%and 66.6%.The oxygen atoms in the PVCap seven membered ring structure are prone to hydrogen bonding with water molecules on the surface of the hydrate,forming a stable cage like structure on the surface of the hydrate crystal nucleus.A large number of seven membered rings adsorb to form a layer of coating film,weakening the mass and heat transfer effects brought by external fluids.Antifreeze proteins adsorb to the surface of hydrates through hydrogen bonding and hydrophobic interactions,reducing the surface area of hydrates and increasing the resistance of external fluids to mass and heat transfer to the surface,thereby delaying the decomposition of hydrates.The viscosity effect of commonly used drilling fluid treatment agents on hydrate decomposition inhibition and the two selected high-efficiency hydrate decomposition inhibitors can provide drilling fluid technical support for hydrate formation drilling.

关 键 词：钻井液 水合物地层钻探 水合物分解抑制剂 

分 类 号：TQ016[化学工程] TE254[石油与天然气工程—油气井工程]