Drilling Fluid to Accelerate Drilling in Top Formations in Mid-Sichuan
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摘要: 将单项技术进行集成应用,以目前常用的钾聚磺钻井液技术为基础,采用硅基防塌技术和防泥包技术,解放钻井液密度,形成一套适用于川中地区的增速钻井液体系。室内研究表明,该钻井液体系具有较强的抗盐污染及防泥包能力;增速钻井液岩屑滚动回收率高达95.0%,岩心膨胀降低率高达96.8%,均优于聚合物钻井液和聚磺钻井液,仅次于油基钻井液,说明该钻井液具有较强的防塌能力。现场应用中,通过对比川中地区井身结构、钻井工艺措施一致的井,采用该钻井液体系钻进的井机械钻速平均提高48.66%、划眼时率平均降低74.97%、井径扩大率平均降低18.14%, 达到了提高钻头破岩效率、提高机械钻速、降低复杂事故率的目的,具有很好的现场应用前景。Abstract: A new drilling fluid was formulated incorporating potassium-polymer-sulfonate drilling fluid technology, silicone-base inhibitive drilling fluid technology and anti-balling technology, which was aimed at reducing mud weight and increasing drilling rate in the mid-Sichuan area. Laboratory study showed that this drilling fluid formulation is tolerant of salt contamination and reduces the potential of bit balling. Percent recovery of shale samples tested with this drilling fluid formulation was 95.0%, while shale core swelling test gave a percent reduction of swelling of 96.8%, both of which were better than polymer mud and polymer-sulfonate mud, but inferior to oil base mud. In field application in mid-Sichuan basin, average ROP was increased by 48.66%, time spend in reaming was reduced by 74.9%, and average percent hole enlargement was reduced by 18.14% in wells drilled with the said drilling fluid formulation.
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Key words:
- mid-Sichuan area /
- Shale formation /
- Accelerate /
- Drilling fluid
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