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伊朗Y油田水平井水平段长在900～1000m,平均钻井周期为69d。该工区水平井施工存在二开井段盐膏层污染严重,潜在异常高压盐水层;Ph、Iam和Lf地层泥灰岩、页岩易水敏剥落,造成井壁失稳;斜井段漏失,滑动钻进“托压”严重,斜井段井眼清洁困难等技术问题。为此,对水平井钻井液体系配方和工程技术措施进行优化,改善钻井液抗污染、封堵防塌及润滑防卡性能,加强井眼净化及摩阻控制。“多元协同”防塌技术解决了井壁失稳问题;随钻防漏与细颗粒堵漏技术解决了定向段渗漏地层措施受限问题;液体润滑剂、固体润滑剂、乳化石蜡和聚合醇复配使用润滑效果显著,该井滑动钻进摩阻小于10kN,未出现明显的“托压”现象,并从现场验证了液体润滑剂最佳加量应小于3%。S4井现场试验表明,优化后钻井液技术措施效果显著,钻井过程无复杂事故发生,钻井周期缩短至57d。
The horizontal section of Iran Y oilfield horizontal well is 900-1000m long and the average drilling period is 69d. The horizontal well construction in the work area is characterized by serious pollution of the salt-gypsum layer in the second open shaft section and potentially abnormally high pressure saline layer. Ph, Iam and Lf strata of the marl are susceptible to water-exfoliation and shale, resulting in instability of the shaft wall; Sliding drilling “Torque pressure ” Serious, inclined shaft hole cleaning difficulties and other technical problems. To this end, the horizontal well drilling fluid formulation and engineering and technical measures to optimize the drilling fluid to improve anti-pollution, anti-collapse and anti-slip anti-card performance, enhance wellbore purification and friction control. “Multi-synergy ” anti-collapse technology to solve the problem of instability of the wellbore wall; while drilling leak and fine particle plugging technology to solve the restricted section of the directional section of the leakage of measures; liquid lubricants, solid lubricants, emulsified paraffin and The lubricating effect of the compounding alcohol compounding is remarkable. The sliding friction resistance of the well is less than 10kN, and there is no apparent “pressure holding” phenomenon. The best dosage of the liquid lubricant should be less than 3% from the field. The field test of S4 well shows that the technical measures of the drilling fluid after optimization are effective, no complicated accidents occur in the drilling process, and the drilling cycle is shortened to 57 days.