钻井液用低生物毒性合成酯润滑剂的研究与应用

Research and Application of Synthetic Ester Lubricant with Low Toxicity Used in Drilling Fluid

为了降低处理钻井液废弃物费用,缓解废弃钻井液给环境带来的不利影响,满足目前现场钻井工程的需求和环境要求,以长链脂肪酸与多羟基醇为原料制得合成酯润滑剂HCZ。研究了HCZ的润滑效果、抗温抗盐性、毒性、与钻井液的配伍性,并在四川高石梯-磨溪地区进行了现场应用。结果表明,HCZ的润滑效果好于聚醚、沥青、矿物油类润滑剂,含0.3%HCZ钻井液的泥饼黏附系数降低率达到51%;HCZ可提高钻井液的抗温抗盐性;HCZ生物毒性低,与聚合物、有机盐、聚磺钻井液体系的配伍性良好。HCZ的润滑效果稳定,含HCZ的高密度聚磺钻井液体系在现场循环使用8 d后的泥饼黏附系数降低率为49.1%,满足现场钻进施工需求。

In order to reduce the treatment cost of waste drilling fluid,alleviate the adverse effect of waste drilling fluid on environment,and meet the requirements of drilling engineering and environment,the synthetic ester lubricant HCZ was prepared with long chain fatty acid and polyhydric alcohol as raw materials. The lubrication effect of HCZ,temperature resistance and salt tolerance,toxicity and compatibility with drilling fluid were studied. And HCZ was applied on site in Gaoshiti-grinding creek region of Sichuan province. The results showed that the lubrication effect of HCZ was better than that of polyether,asphalt and mineral oil lubricant. The adhesion coefficient decline of mud cake in drilling fluid containing 0.3% HCZ reached 51%. HCZ could improve the temperature resistance and salt tolerance of drilling fluid. HCZ had low biotoxicity,and good compatibility with polymer,organic salt and polysulfonate drilling fluid systems. The lubrication effect of HCZ was stable. The mud-cake adhesion coefficient decline of polysulfonate drilling fluid with high density containing HCZ was 49.1% after being recycled for 8 days,which met the requirement of site drilling.