胜利油田小井眼侧钻水平井钻井液技术  

Drilling-fluid technologies for slimhole sidetrack horizontal wells in Shengli oilfield

作　　者：明玉广 赵红香 明保霖 宋翔远 张亚男[1] MING Yuguang;ZHAO Hongxiang;MING Baolin;SONG Xiangyuan;ZHANG Yanan(Drilling Fluid Technology Service Center,Sinopec Shengli Petroleum Engineering Corporation,Dongying,Shandong 257000,China;Oil&Gas Downhole Operation Center,Sinopec Shengli Oilfield Company,Dongying,Shandong 257000,China)

机构地区：[1]中国石化胜利石油工程有限公司钻井液技术服务中心,山东东营257000 [2]中国石化胜利油田油气井下作业中心,山东东营257000

出　　处：《天然气勘探与开发》2025年第1期81-86,共6页Natural Gas Exploration and Development

基　　金：中国石化石油工程公司基金项目(编号:SG23-11J);中国石化胜利石油工程有限公司科技攻关项目(编号:SKG2401)联合资助。

摘　　要：位于渤海湾盆地的胜利油田在挖潜老油田剩余油工作中,年部署小井眼开窗侧钻井达400口,其中绝大多数井都存在泥页岩井壁失稳、泥包钻头、短半径水平井狗腿度大且易托压、小井眼环空压耗高、形成岩屑床等难题。为了优化钻井液技术,通过分析已完成的多口小井眼侧钻井的钻井液技术体系设计、固相控制等,重点针对多元醇—聚合物正电胶体系构成、现场施工工艺技术、复杂事故原因和处理方法进行分析、评估。研究结果表明:(1)多元醇—聚合物正电胶体系保证了侧钻小井眼不同井段的钻井施工,该体系在抑制、润滑、井壁稳定、油气层保护等方面评价效果较好;(2)控制钻井液的漏斗黏度和动塑比是满足小井眼井壁稳定和良好携岩的两个重要条件,合理的流变参数控制是小井眼井壁稳定的关键前提。结论认为,以原聚合物正电胶钻井液为基础,加入2%~3%多元醇后,可以有效清除岩屑床,保证井眼清洁,钻进过程中井壁稳定,未发生复杂事故,缩短了钻完井周期,降低了钻井成本,有助于老油田剩余产能挖潜。Annually,400 wells are deployed by slimhole sidetrack drlling in Shengli oilfield of Bohai Gulf Basin to exploit remaining oil in this mature field.However,most of them are confronted with wellbore instability in shales,bit balling,large dogleg degree and backing pressure especially in horizontal wells with small radius,high annular pressure loss in slimhole,and cutting bed formation.It is essential to optimize drilling-fluid technologies.Thus,the system design and solid phase control were analyzed and made for the technologies used in the sidetrack slimhole.And the composition,field operation,and complexity cause/treatment were investigated for the polyol-polymer mixed metal hydroxide(MMH)system.Results show that(i)this system may guarantee the sidetrack slimhole drilling in various sections because of its better performance in inhibition,lubrication,wellbore stability and reservoir protection;and(ii)as two major parameters to condition drilling fluid,both funnel viscosity and ratio of yield point to plastic viscosity may ensure this stability and cutting-carrying in slimhole,and proper rheological parameters is also a key technique for the stability.In conclu-sion,2%-3%polyol added to the original polymer MMH system may guarantee the cutting bed removed effectively,the clean and sta-ble wellhole during drilling without any complexity,thus reducing the drilling or completion period and drilling costs,which may be conducive to tapping the potential of remaining resources in old oilfields.

关 键 词：小井眼 侧钻水平井 钻井液工艺 多元醇 保护油气层 聚合物 正电胶 

分 类 号：TE254[石油与天然气工程—油气井工程]