无固相钻井液超高温增黏剂SDKP的结构、性能及应用

Structure, Property and Application of Ultra-High Temperature Viscosifier SDKP for Solid-Free Drilling Fluid

谢彬强 邱正松

XIE Bin-Qiang QIU Zheng-Song

针对当前无固相钻井液抗温能力较差，无法满足深部潜山高温储层保护技术需要，研制了一种超高温增黏剂SDKP，采用红外光谱、核磁氢谱和凝胶色谱表征和测定了SDKP的分子结构和相对分子质量，采用热重分析研究了其分子链的热稳定性，评价了其在无固相水基钻井液中的增黏、抗温、抗盐性能。采用环境扫描电镜（ESEM）和流变仪对其增黏机理进行了探讨。结果表明，SDKP具有良好的增黏性和热稳定性，能有效提高无固相钻井液的黏度，在淡水、盐水无固相钻井液中的抗温能力达180℃，抗温增黏效果优于国外同类代表性处理剂HE300。SDKP分子在水中形成了由微米级纤维束构成的紧密的空间网状结构，且在盐水中也能形成连续的缔合结构；SDKP水溶液具有高温增黏特性，且在盐水中也具有一定的高温增稠特性。SDKP在辽河兴古潜山马古-H117井高温水平井段进行了现场应用，应用结果表明，以SDKP为主处理剂形成的卤水无固相钻井液具有良好的流变性和热稳定性，确保了该井水平段安全、顺利施工。

Aimed at the problem of poor anti-temperature capability of solid-free drilling fluid，which cannot meet the needs of high temperature deep buried hill reservoir protection technology, the ultra-high temperature polymer viscosifier SDKP was developed．The molecular structure of SDKP was analyzed by the measurements of FT-IR and 1H-NMR. The relative molecular weight was measured with GPC. Thermal stability of the SDKP was analyzed with TGA. The property of thickening, temperature resistance and salt tolerance in solid-free drilling fluid was evaluated. The thickening mechanism was analyzed by using environmental scanning electron microscopy (ESEM) and rheometer. Results showed that SDKP had excellent thickening ability and thermal stability and could effectively improve the viscosity of solid-free drilling fluid. Temperature resistance of SDKP in freshwater solid-free drilling fluid and in brine solid-free drilling fluid was up to 180℃, which was much better than that of the similar foreign representative treatment agent HE300. The close spatial network structure formed by micron fiber bundles was made up of SDKP in water and continuous network structures were still formed in the brine solution, and SDKP had the thermo-thickening properties, and also had some thermo-thickening properties in saline. It was applied in horizontal well Magu-H117 of Liaohe Xinggu buried hill. The field application results showed that the brine solid-free drilling fluid with SDKP as the main treatment agent, had good rheological and thermal stability, ensuring the safe and smooth construction of horizontal section.