Application of Safe High-Performance Water Base Drilling Fluid Technology in Zhunzhong Area
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摘要: 准中区块地质构造复杂、储层埋藏较深,同一裸眼井段存在多套压力体系,中下部地层发育硬脆性泥岩,西山窑组及八道湾组地层煤层节理微裂缝发育,容易频发大量掉块、坍塌、卡钻等井壁严重失稳事故。在分析准中区块地层失稳因素及机理情况下,提出了深井井眼稳定原则和提速原则,研制出了适合准中区块的水基安全高效钻井液技术。该技术在准中1和准中4区块现场应用完钻6口井,复杂时效降低了86.74%,平均机械钻速相比同区块邻井分别提高了46.03%和25.39%;平均井眼扩大率相比同区块邻井分别降低了69.07%和45.18%,达到了稳定井壁、提高机械钻速的目的。Abstract: Formations in the Zhunzhong (the middle of Junggar Basin) area has complex geological structure; the same hole section penetrates formations with several different pressure systems and the middle and the lower formations are developed with hard and brittle mudstones. The Xishanyao Formation and the Badaowan Formation have joint coal beds and are full of micro fissures which frequently caused sloughing, borehole wall collapse and pipe sticking to happen. Another drilling difficulty is the deep buried reservoirs. Principles of stabilizing the borehole wall and enhancing the rate of penetration were presented based on the analyses the affecting factors and mechanisms of borehole wall instability. A set of water base drilling fluid technology was developed for drilling in the Zhunzhong area safely and efficiently. This technology has been applied on 6 wells in Zhunzhong-1 block and Zhunzhong-4 block, NPT was reduced by 86.74%. Compared with wells previously drilled in the two blocks, the average ROPs were increased by 46.03% and 25.39%, respectively, and the percent hole enlargement was reduced by 69.07% and 45.18% respectively. Using this technology, the goals of stabilizing borehole wall and enhancing ROP have been achieved.
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