摘要
针对微乳液型油基钻井液清洗液适用温度范围窄,且在高盐情况下易失效的问题,选用非离子表面活性剂Brij A和阴离子表面活性剂SJB制备了一种耐温抗盐的油基钻井液清洗液PF-MOCLEAN。通过室内实验,研究了表面活性剂的配比和浓度对PF-MOCLEAN清洗效果的影响,确定了油基钻井液清洗液PF-MOCLEAN的最优组成,即SJB与Brij A的复配比为2∶1,且2者总加量为60%。清洗液PF-MOCLEAN遇到油基钻井液后能够自发增溶油相形成微乳液,具有界面张力超低、增溶能力强、扩散速率快等优点,能够在40~120℃及高盐含量下有效地清除黏附在套管和井壁上的油基钻井液,清洗效率高达95%,并将套管和井壁的润湿性由亲油性变为亲水性,有利于储层保护和现场固井作业。该剂在南海区域取得了很好的应用效果,应用前景广阔。
A thermal stable salt-resistant oil base mud cleansing fluid, PF-MOCLEAN, has been developed with a nonionic surfactant Brij A and an ionic surfactant SJB, in an effort to overcome the problems of narrow range of applicable temperature and of losing efficacy in high salinity environment when micro emulsion oil base mud cleansing fluid is used. Laboratory study has been done on the effects of the quantity ratio and concentrations of the two surfactants on the cleansing efficiency of PF-MOCLEAN, and the optimum composition of PF-MOCLEAN was determined, that is, SJB ： Brij A = 2∶1, and the total concentration of the two surfactants is 60%. PF-MOCLEAN, when in contact with oil base muds, automatically solubilizes oil phases to form a micro emulsion with ultra-low surface tension, high solubilizing power and high rate of diffusion. It effectively cleans off 95% oil base muds adhered on the surfaces of casing and borehole wall in a temperature range of 40-120 ℃ and in high salinity environment, meanwhile turns the surfaces of casing and borehole wall from being hydrophobic to hydrophilic, which is beneficial to reservoir protection and well cementing job. PF-MOCLEAN has been effectively used in South China Sea, showing prosperous future of application.
作者
卜继勇
赵春花
童坤
孙德军
BU Jiyong;ZHAO Chunhua;TONG Kun;SUN Dejun(Indonesia Operating Company of Oilfeld Chemistry, COSL, Yanjiao, Hebei 065201;Oilfeld Chemistry R＆D Institute, COSL, Yanjiao, Sanhe, Hebei 065201;MOE Key Laboratory of Colloid and Interface Chemistry in Shandong Unversity, Jinan, Shandong 250100)
出处
《钻井液与完井液》
CAS
北大核心
2018年第2期68-72,共5页
Drilling Fluid & Completion Fluid
关键词
油基钻井液
清洗液
微乳液
耐温
高盐
表面活性剂
Oil-based drilling fuid
Cleansing fuid
Micro emulsion
Thermally stable
High salinity
Surfactant
