CAJ | 학술논문

超深井多选用高密度饱和盐水磺化钻井液体系，本研究引入高浓度甲酸钾溶液作为钻井液基液，有效减少高密度钻井液固相含量，提高钻井液及关键处理剂的热稳定性，同时加快超深井深部巨厚盐岩层钻井速度、减缓钻具腐蚀，充分发挥甲酸盐钻井液良好的抑制性和泥饼质量，低环空压耗等优势。讨论了重晶石在甲酸钾溶液中的溶解性以及甲酸钾溶液的抗盐抗钙污染能力，研究结果表明，重晶石在甲酸钾溶液中几乎不溶，所以在饱和盐水磺化钻井液中可用30％～70％（ w ）甲酸盐溶液提高基液密度，然后采用重晶石进行加重是可行的。此外，氯化钠和石膏在甲酸盐溶液中的溶解度均有不同程度的降低，可用于进一步提高磺化钻井液的抗盐抗钙污染能力。
초심정다선용고밀도포화염수광화찬정액체계，본연구인입고농도갑산갑용액작위찬정액기액，유효감소고밀도찬정액고상함량，제고찬정액급관건처리제적열은정성，동시가쾌초심정심부거후염암층찬정속도、감완찬구부식，충분발휘갑산염찬정액량호적억제성화니병질량，저배공압모등우세。토론료중정석재갑산갑용액중적용해성이급갑산갑용액적항염항개오염능력，연구결과표명，중정석재갑산갑용액중궤호불용，소이재포화염수광화찬정액중가용30％～70％（ w ）갑산염용액제고기액밀도，연후채용중정석진행가중시가행적。차외，록화납화석고재갑산염용액중적용해도균유불동정도적강저，가용우진일보제고광화찬정액적항염항개오염능력。
Potassium-based solution with high concentrations is brought into saturated brine sulfonated drilling fluid in the complex ultra-deep wells ,which can reduce the solid content of high-density drilling fluid ,improve the thermal stability of the drilling fluid ,temperature resist-ance of key treatment agents and the drilling speed in the extremely thick ultra-deep salt forma-tion ,and slow down the drilling corrosion .At the same time ,formate drilling fluids have the ad-vantages of inhibitive ability ,good quality of mud cake ,low annular pressure lost and friction co-efficient .This article discussed the solubility of barite in potassium formate solution and its toler-ance to salt and calcium .The experimental results showed that barite was almost insoluble in po-tassium solution so that the formate solution of 30% ~70% was used to improve the density of base fluid and then choosing barite to aggravate it was feasible .In addition ,the solubility of sodi-um chloride and gypsum in formate solution both reduced by different degrees ,w hich could be used to further increase the tolerance to salt and calcium of sulfonated drilling fluid .