The Application of Strong-Inhibition Plugging Microemulsion Drilling Fluid in SACHA Block
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摘要: 厄瓜多尔SACHA区块φ215.9 mm井段在钻井过程中经常出现钻头泥包、井壁坍塌、起下钻遇阻、测井和下尾管阻卡等问题,在分析原因的基础上,选择有利于环保的有机抑制剂SUPHIB、半透膜剂MS和隔离膜剂EX等材料,优选出微乳液强抑制强封堵钻井液配方,并通过室内试验评价了其性能,结果表明:该钻井液在100 ℃条件下热滚16 h后仍具有良好的基本性能;具有良好的抑制性能和封堵性能,对TENA层岩屑的回收率达到90%以上,膨胀率仅有1.32%,对高孔高渗储层岩心的封堵率达到99%。微乳液强抑制强封堵钻井液已经在厄瓜多尔SACHA区块的8口井进行了应用,均没有出现钻头泥包、起下钻遇阻、测井和下尾管阻卡等问题,且φ215.9 mm井段平均井径扩大率降至10%以下。这表明,微乳液强抑制强封堵钻井液能够有效解决厄瓜多尔SACHA区块φ215.9 mm井段的一系列井下复杂问题。Abstract: During drilling in the SACHA Block of Ecuador, downhole troubles often occurred at φ215.9 mm hole section, such as bit balling, hole collapse, tight points met in tripping, logging and liner running. In order to solve these problems, a strong-inhibition plugging microemulsion drilling fluid was developed by using environmentally friendly organic inhibitor SUPHIB, semi-permeable diaphragm MS and isolating membrane agent EX, its performance was evaluated by means of laboratory experiments. The research results showed that this system had good performance after being boiled at 100 ℃ for 16 h, with good inhibition and plugging effect, the recovery rate of TENA cutting reached over 90%, expansion ratio and plugging rate were 1.32% and 99% respectively for high-porosity high-permeability reservoir cores. It has been successfully applied to 8 wells in SACHA Block, no bit balling, tripping sticking ro drag in logging and liner running occurred, and average hole enlargement rate at φ215.9 mm hole section dropped to less than 10%. It is shown that the problems that occurred at φ215.9 mm hole section in the SACHA Block of Ecuador can be solved effectively by using strong-inhibition plugging microemulsion drilling fluids.
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Keywords:
- drilling fluid /
- microemulsion /
- inhibition /
- plugging /
- SACHA Block /
- Ecuador
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