针对牙哈储气库钻井中油基钻井液体系在高—低温循环条件下流变性恶化且堵漏承压能力不足难题,研发了一种温敏型抗高温提切剂RHT,并优选堵漏材料和配套处理剂,构建了一套抗高温防漏堵漏油基钻井液体系.通过红外光谱、核磁共振氢谱、热重曲线和DSC分析等表征手段,深入分析了RHT的分子结构、热稳定性及温敏特性,系统评价了其在乳液和油基钻井液中的流变性调控作用.实验结果表明:RHT显著改善乳液的剪切稀释性和触变性,且在高低温循环条件下具有良好的流变性调控能力,80℃条件下,体系动切力提升 87%,塑性黏度无增加;220℃时,动切力提升 220%,动塑比为 0.49 Pa/(mPa·s).经 220℃老化后的钻井液体系保持了较强的携岩性能,并能够有效封堵 20～40 目砂床和 1～3 mm缝板,最大承压能力 8 MPa.该体系在牙储-X井的现场应用中,显著改善了钻井液的携岩与堵漏性能,减少了漏失与卡钻等复杂问题,为牙哈储气库的高效开发提供了有力的技术支撑.

To address the challenges of the oil-based drilling fluid system's deteriorating rheological properties and insufficient plugging pressure resistance under high-low temperature cycling conditions in the Yaha gas storage reservoir drilling,a tempera-ture-sensitive high-temperature thickener,RHT,was developed.Optimized plugging materials and supporting agents were selected to construct a high-temperature resistant oil-based drilling fluid system.Characterization methods,including infrared spectroscopy,nuclear magnetic resonance hydrogen spectra,thermogravimetric analysis,and differential scanning calorimetry(DSC),were used to analyze RHT's molecular structure,thermal stability,and temperature-sensitive characteristics in depth.The systematic evaluation of its rheological control in emulsions and oil-based drilling fluids was conducted.Experimental results showed that RHT significantly improved the shear-thinning and thixotropic properties of the emulsion,demonstrating excellent rheological control capabilities under high-low temperature cycling conditions.At 80℃,the dynamic yield stress increased by 87%without any increase in plastic viscosity;at 220℃,the dynamic yield stress increased by 220%,with a dynamic plastic ratio of 0.49 Pa/(mPa·s).The drilling fluid system maintained strong rock-carrying capacity after aging at 220℃and effectively sealed 20～40 mesh sand beds and 1～3 mm cracks,achieving a maximum pressure resistance of 8 MPa.In the field application of the Yaha gas storage reservoir well X,this system significantly enhanced the rock-carrying and plugging performance of the drilling fluid,reducing complexities such as fluid loss and stuck pipe incidents,thereby providing strong technical support for the efficient development of the Yaha gas storage reservoir.