新型水合物抑制剂HBH的评价研究  

Evaluating Investigation of A New Hydrate Inhibitor HBH

作　　者：白小东[1] 黄进军[1] 王川[2] 严焱诚[3] 

机构地区：[1]西南石油大学石油工程学院,四川成都610500 [2]中国石油西南油气田分公司天然气研究院,四川成都610213 [3]中国石化西南分公司工程技术研究院,四川德阳618000

出　　处：《石油钻探技术》2007年第2期36-38,共3页Petroleum Drilling Techniques

基　　金：中国石油天然气集团公司重点研究项目"钻井前沿技术专项研究"(编号:CNPC373)部分内容

摘　　要：在海洋深水领域钻井中,水基钻井液遭受气侵时,气体和钻井液中的自由水会在一定温度、压力条件下形成水合物,妨碍油井的压力监控。为防止水合物的形成,需加入水合物抑制剂。以中国海洋石油油田技术服务公司广泛使用的水基钻井液为基浆,在室内评价了水合物抑制剂HBH的抑制性、与兼有水合物抑制性和润滑性能的PEG600的配伍性和对水基钻井液流变性的影响,优选出了适用于深水钻井的具有水合物抑制性的水基钻井液配方。评价结果表明,HBH具有良好的抑制性且在加量小于0.5%时对水基钻井液的流变性和滤失量影响不大。初步分析了水合物的形成机理及水合物抑制剂的作用机理,认为水合物是通过气体分子的溶解、扩散形成“笼”形骨架,最后进行选择性吸附而形成,而HBH则是通过高分子的吸附,利用其分子链段上的特殊五圆环镶嵌到水合物的“笼”形结构中,阻止气体分子进入从而抑制水合物的形成。When water-based mud is invaded by gas during drilling in deepwater, gas and free water in drilling fluids will form hydrate under certain temperature and pressure condition which hinders the wellbore pressure monitor. The hydrate inhibitor was added to prevent the creation of hydrate. Based on the water-based mud commonly used in CNOOC, the inhibiting property of hydrate inhibitor HBH and the compatibility of PEG600 with the properties of hydrate inhibiting and lubricant on the impacts of the waterbased mud rheology have been evaluated experimentally. The water-based mud with the property of hydrate inhibiting, which is suitable for deepwater drilling, is identified. Evaluating results indicate that HBH has a good inhibiting property and has small impact on the mud rheology and filtration loss when added percentage of HBH is less than 0.5%. Mechanism of hydrate formation and the hydrate inhibitor were analyzed. When the gas molecular dissolved into the water and formed the cage in structure, after preferential adsorption the hydrate was formed. While HBH prevents gas molecular entering the cage thereafter hinders the creation of hydrate through the polymer adsorption and embedded in the cage using its special five ring structure.

关 键 词：水合物 抑制剂 水基钻井液 流变性 滤失控制 机理 

分 类 号：TE254.4[石油与天然气工程—油气井工程]