Drilling Fluid Technology for Enhancing Borehole Stability for Complex Reservoirs in the San Jorge Oilfield, Argentina
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摘要: 阿根廷圣豪尔赫湾油田二开钻遇地层以泥岩和凝灰岩为主,地层破碎且微裂缝发育,岩石中蒙脱石和石英含量高,水敏性强,在应用BIOCAT钻井液钻进二开井段时井塌频繁,井径扩大率超过100%,每年有2~4口井因井塌而报废。为此,优选防塌抑制性能强的SRIPE-inhibitor系列抑制剂代替BIOCAT抑制剂,并添加非渗透剂SMT3、弹性石墨和碳酸钙等封堵材料,形成了非渗透强抑制防塌钻井液。室内抑制性能评价结果表明,非渗透强抑制防塌钻井液比BIOCAT钻井液具有更强的防塌抑制性能,膨胀率降低10百分点以上,回收率提高60~70百分点,坍塌周期延长1倍。阿根廷圣豪尔赫湾油田24口井应用了非渗透强抑制防塌钻井液,与应用BIOCAT钻井液的邻井相比,井塌明显减少,二开井段井径扩大率由100%降至10%,钻井周期缩短15%,钻井成本降低10%。这表明,非渗透强抑制防塌钻井液可解决阿根廷圣豪尔赫湾油田二开井段井壁失稳的问题。Abstract: In the second section drilling of Argentina San Jorge Oilfield, it is necessary to drill through mudstone and tuff formations. These formations are characterized by extensive micro-fractures. Both montmorillonite and quartz contents are high with strong water-sensitivity. Currently the BIOCAT drilling fluid system adopted often results in wellbore collapse frequently and abandoning 2-4 wells every year. The borehole enlargement rate was over 100% in an unstable hole section in drilled wells. In order to resolve these problems, the impermeable anti-collapsing inhibitive polymer drilling fluids system is developed by optimizing the SRIPE-inhibitors with high anti-collapsing inhibitor instead of BIOCAT. In addition, an inhibitor with addition of impermeable agent SMT3 and sealing materials such as graphite, calcium carbonate, etc. were included. Laboratory experimental results showed that the optimized drilling fluid system has stronger inhibitive and anti-collapse capacities than BIOCAT system. The swelling increment decreases by over 10% and recovery rate increases by 60%-70%. In addition, it can efficiently prolong the borehole wall stable period by 100%. Good results have been achieved in applications of the system in 24 wells. Compared with adjacent wells with application of BIOCAT drilling fluid system, wellbore collapses decreased significantly and borehole diameter enlargement in unstable hole section in wells decreased from 100% to 10%, drilling time decreased by 15% and drilling cost decreased by 10%. Results suggest that the impermeable anti-collapsing inhibitive polymer drilling fluid system application in Argentina’s San Jorge Oilfield can effectively solve wellbore instability problems.
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