油基钻井液用冲洗液PC–W31L的制备及性能研究

The Development and Properties of PC–W31L Flushing Fluid for Oil-Based Drilling Fluid

针对油基钻井液用水包油型冲洗液无法用润湿测定仪检测混合液(即油基钻井液与冲洗液的混合液,全文同)电导率的问题,优选复配了合适的表面活性剂和溶剂,并引入一种含氮类聚合物,制备了油基钻井液用冲洗液PC-W31L.分析了PC-W31L冲洗油基钻井液的作用机理,并对其性能进行了评价.结果表明:PC-W31L对油基钻井液的冲洗效果良好,冲洗界面为水润湿状态,能使油基钻井液由油连续相完全转变为水连续相;PC-W31L与油基钻井液、水泥浆的流变相容性良好,对水泥浆稠化时间和抗压强度的影响均在可控范围内.研究表明,冲洗液PC-W31L不但对油基钻井液的冲洗效果良好,且能用润湿测定仪测定其水润湿能力.

We address the problem of not being able to detect the conductivity change of mixed liquid(oil-based drilling fluid and flushing fluid)in oil-based drilling fluid.Flushed by oil-in-water based flushing fluid with the wetting tester,the proper surfactant and solvent were optimized and compounded,and a nitrogen-containing polymer was introduced to develop the PC–W31L flushing fluid for oil-based drilling fluid.The flushing mechanism of this fluid on oil-based drilling fluid was analyzed and its performance was evaluated.The results showed that the flushing effect of PC–W31L flushing liquid on oilbased drilling fluid was optimal,the flushing interface was in water wet state,which can completely transform oil-based drilling fluid from the oil continuous phase to the water continuous phase.The rheology compatibility of this fluid is better with oil-based drilling fluid and cement slurry respectively,and its influences on the thickening time and strength of cement slurry are all within the controllable range.The results of performance evaluation indicated that PC–W31L flushing liquid not only had a good flushing effect on oil-based drilling fluid,but also allowed the wetting tester to detect its water wetting capacity.