摘要
钻井工程中使用油基钻井液一旦发生严重漏失,现场处理更困难,且目前尚未形成油基钻井液的高效堵漏技术,因此提出并探讨了油基钻井液用凝胶堵漏方法。研选结果表明,胶凝剂NJZ能够在柴油中具有良好的溶解性,且成胶性能较好,胶凝剂NJZ与交联剂JLJ成胶效果最好,而其与交联剂AlCl_3·6H_2O、AlC_l3·6H_2O和NaOH复配的成胶效果较差,无法满足要求,胶凝剂NJZ浓度为10.0%、交联剂JLJ浓度为4.0%时,使用乳化剂EHJ的交联效果最好,凝胶强度最高。用正交实验法优化了凝胶堵漏体系配方,分析了温度、p H值、剪切作用等对成胶性能的影响。通过填砂管室内实验评价表明,采用双液注入方法,结合多次挤注工艺,相对水基凝胶堵漏体系,新研制的油基凝胶具有更强的堵漏作用效果,且具有良好的抗温性,在120℃下仍具有较高的凝胶强度,承压能力梯度达到1.05 MPa/m。
Loss of oil base mud downhole is diffcult to stop in feld operation and causes great economic loss. An oil base mud loss control method is presented to effciently control oil base mud loss. This method uses gel lost circulation material （LCM） to control oil base mud loss. In selecting additives for gel LCM, a gelling agent NJZ was found to have good solubility in diesel oil and had good gelling capacity. NJZ reacted very well with a crosslinking agent JLJ to form high quality gels. It did not form good gel with the crosslinking agent AlCl3f 6H2O and NaOH. Highest gel strength was obtained by reacting a 10.0% NJZ solution with 4.0% crosslinking agent solution under the action of an emulsifer EHJ. The formulation of the gel LCM was optimized by orthogonal experiment, and the effects of temperature, pH and shearing on gel strength were analyzed. Laboratory experiment has shown that the gel LCM can be used the way cement LCM is used, and can be squeezed in multiple times. Compared with water base gel LCM, this oil base gel LCM worked better in stopping mud loss and has good high temperature stability; it had high gel strength even at 120？, and was able to tolerate a pressure gradient of 1.05 MPa/m.
出处
《钻井液与完井液》
CAS
北大核心
2016年第6期40-44,共5页
Drilling Fluid & Completion Fluid
基金
国家自然科学基金项目"海洋深水浅层井壁稳定与水合物抑制的机理和新方法"(51474236)
石油化工联合基金"高温高密度高矿化度钻井液流变性的调控机理及新方法"(U1562101)
中石油渤海钻探工程公司技术开发项目"油基钻井液防漏堵漏及页岩气井壁稳定技术研究"(BHZT-NJFGS-2014-JS-77)
关键词
井下漏失
油基钻井液
凝胶堵漏体系
承压能力
钻井工程
Downhole mud loss
Oil base drilling fluid
Gel LCM
Pressure bearing capacity
Drilling engineering
