The biodiesel-based flat-rheology drilling fluid system  

作　　者：JIANG Guancheng SHI He HE Yinbo 

机构地区：[1]Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China [2]MOE Key Laboratory of Petroleum Engineering,China University of Petroleum(Beijing),Beijing 102249,China [3]CNPC Engineering Technology R&D Company Limited,Beijing 102206,China

出　　处：《Petroleum Exploration and Development》2022年第1期200-210,共11页石油勘探与开发（英文版）

基　　金：Supported by the NSFC Innovative Research Group(51821092);NSFC Foundation(52004297);China Postdoctoral Science Foundation(BX20200384);China University of Petroleum(Beijing)Foundation(2462020XKBH00)。

摘　　要：As the base oil of the current flat-rheology synthetic drilling fluid is high in cost and not renewable, the biodiesel-based flat-rheology drilling fluid with low-cost, environmental protection and renewable advantage was studied. Based on the optimization of raw materials, a cheap, environment-friendly biodiesel of soybean oil ethyl ester with good fluidity at low temperature was selected as the base oil. By selecting high oil-water ratio and introducing cationic surfactant into the auxiliary emulsifier, the thickening of biodiesel-based emulsion caused by hydrolysis and saponification after high-temperature aging was effectively eliminated. The organoclay prepared with cationic modifier of hexadecyl trimethyl ammonium chloride was used to improve the rheologic properties, stability and fluid loss of the drilling fluid while preventing low-temperature thickening. A flat-rheology modifier was synthesized with dimer fatty acid and cocoanut fatty acid diethanolamide, which could form strong network structure in the biodiesel-based drilling fluid to adjust effectively rheological properties of the drilling fluid. A biodiesel-based flat-rheology drilling fluid system with the density of 1.2 g/cm^(3) has been formulated which has constant rheology in the temperature range of 2-90 ℃, temperature tolerance of 160 ℃, seawater salinity tolerance of 5%, shale cuttings tolerance of 10%, and is environmentally friendly.

关 键 词：BIODIESEL flat-rheology drilling fluid EMULSIFIER ORGANOCLAY rheology modifier environment friendly deep water drilling 

分 类 号：TE254[石油与天然气工程—油气井工程]