有机盐聚合醇氯化钾钻井液的应用

霍尔果斯背斜构造极其复杂,内应力极高,地层倾角大,断层、破碎带多,并存在高低压互层;安集海河组的灰绿色软泥岩水化严重并具有粘弹塑性.该区块重点探井霍003井三开、四开井段选用有机盐聚合醇氯化钾钻井液,同时为保证钻井液在高密度下（2.55 g/cm^3）具有好的流变性,使用活化铁矿粉、活化重晶石加重.应用结果表明,由于采用了强抑制和多元封堵的措施,该钻井液具有良好的流变性和较强的携带能力,钻进中曾携带出重2.8 kg和5.1kg的大掉块;滤失量低,泥饼质量好,封堵能力强,造壁能力强,减轻了井下阻卡程度;有良好的储层保护能力;在室内研究的基础上,经过现场合理使用和维护钻井液,霍003井提高了机械钻速,缩短了钻井周期,井身质量优于邻井.指出在高密度下,未选出适合有机盐聚合醇氯化钾钻井液的稀释剂,钻井液流动性较差.

Application of Organic Salt/Polyglycol/KCl Drilling Fluid

Huoer Guosi was a composite anticline and had a extremely high internal stress.And also,the formation was characterized by large strata dip,plenty of crush zone,presence of high low pressure alternate layer and serious argillutite hydration.The well of Huo 003 was a major exploration well and employed organic salt/polyglycol/KCl drilling fluid in the third and fourth drilling section.Active iron ore and barite were also present in the formulation of drilling fluid to provide favorable rheology in heavier weighted fluids of 2.55 g/cm~3.Application results indicated that the organic salt/polyglycol/KCl drilling fluid presented a favorable rheology and so strong cuttings carrying capacity that a 2.8 kg block and a 5.1 kg block were once transported to the surface.It had lower filtration and high quality mudcake,stronger sealing and wall building properties and can also significantly lessen logy and can effectively protect the formation.Improved ROP and drilling period and better wellbore quality than the offset well were acquired as a result of employing that fluid.However,the study showed that thinner for organic salt/polyglycol/KCl drilling fluid is essential in heavier weighted fluid and inferior rheology would obtained if no matching thinner was selected.