空气泡沫钻井在柴探1井的应用  

Application of Air-Foam Drilling in Well Chaitan1

作　　者：孙澜江 张抒夏 李保青 邢超 刘顽 钟宁龙 SUN Lanjiang;ZHANG Shuxia;LI Baoqing;XING Chao;LIU Wan;ZHONG Ninglong(Research Institute of Engineering Technology,CNPC Western Drilling Engineering Co.,Ltd.,Karamay 834000,Xinjiang,China;Engineering Technology Department,CNPC Western Drilling Engineering Co.,Ltd.,Urumqi 830000,Xinjiang,China;Exploration Business Department,PetroChina Qinghai Oilfield Company,Dunhuang 736202,Gansu,China;Qinghai Drilling Company,CNPC Western Drilling Engineering Co.,Ltd.,Haixi 816400,Qinghai,China)

机构地区：[1]中国石油西部钻探工程有限公司工程技术研究院,新疆克拉玛依834000 [2]中国石油西部钻探工程有限公司工程技术处,新疆乌鲁木齐830000 [3]中国石油青海油田分公司勘探事业部,甘肃敦煌736202 [4]中国石油西部钻探工程有限公司青海钻井公司,青海海西816400

出　　处：《新疆石油天然气》2022年第4期1-6,共6页Xinjiang Oil & Gas

基　　金：中国石油西部钻探工程有限公司科研基金项目“柴深构造复杂超深井安全优快钻完井配套技术研究”(022XZ011)。

摘　　要：柴达木盆地英雄岭、干柴沟、咸东等多个区域浅表部地层成岩性差、胶结疏松且裂缝发育,钻井过程中失返性漏失频发,严重制约钻井提速,影响钻井安全,是亟待解决的区域性难题。柴探1井是部署在咸东地区的一口风险探井,一开Φ660.4 mm井眼采用常规钻井液施工期间漏失量巨大,堵漏效果不佳,已不具备继续钻进条件。通过采用空气泡沫钻井技术,优选该井适用的发泡剂与抑制剂,针对性地解决了浅表层失返性漏失频发难题,钻井周期大幅缩短;采用清砂下套管技术,实现了井壁失稳、井径不规则井段套管的安全下入。柴探1井Φ660.4 mm井眼空气泡沫钻井技术的成功实施,为柴达木盆地浅表层钻井低压易漏易垮塌难题提供了解决思路和技术储备。In many areas of Qaidam Basin,such as Yingxiongling,Ganchaigou and Xiandong,the shallow strata have poor lithology,loose cementation,fracture development,and frequently-occurred loss-return leakage in the process of drilling,which have seriously restricted the speed of drilling and affected the safety of drilling.This is a regional problem that needs to be solved urgently.Well Chaitan1 is a risk exploratory well located in Xiandong area.Conventional drilling fluid was used for the drilling of the surface section hole with a diameter of 660.4 mm.Leakage during the drilling was huge,and the plugging effect was not satisfactory.Therefore,it no longer possessed conditions to continue with the drilling.By using air-foam drilling technique and selecting the most suitable foaming agent and inhibitor for this well,the problem of frequently-occurred loss-return leakage in shallow strata has been solved,and the drilling cycle has been greatly shortened.By using the technique of sand cleaning-casing running,safe casing running has been realized in the well section with instable borehole and irregular hole diameters.The successful application of air-foam drilling technique in theΦ660.4 mm hole of Well Chaitan1 provides an approach and technical reserve for solving the problems of low pressure and likelihood for leakage and collapse in shallow strata during drilling in Qaidam Basin.

关 键 词：失返性漏失 空气泡沫钻井 发泡剂 抑制剂 清砂下套管 

分 类 号：TE242[石油与天然气工程—油气井工程]