胜科1井大井眼及盐膏层钻井技术  

Well Shengke-1 Large Hole and SaltGypsum Beds Drilling Technique

作　　者：张新旭[1] 刘天科[1] 裴建忠[1] 王振光[1] 李晓明[1] 

机构地区：[1]胜利石油管理局黄河钻井总公司,山东东营257064

出　　处：《石油钻探技术》2007年第6期14-17,共4页Petroleum Drilling Techniques

摘　　要：胜科1井是中国石化在胜利油田部署的一口重点科学探索井,完钻井深7 026 m，φ339.7 mm技术套管下深2 922.78 m,φ311.1 mm大井眼井段深达4 155 m,采用了阶梯式大井眼结构设计与钻头优选技术,提高了大井眼钻井速度。为解决盐膏层蠕变挤毁套管问题,裸眼段全部使用φ250.8 mm厚壁（壁厚15.88 mm）VM140HCVA进口高抗挤套管,并采用尾管固井技术。针对胜科1井钻井过程中钻遇的大段复合盐膏层、软泥岩、膏泥岩和极易水化膨胀的红泥岩,分析了其蠕变规律,发现胜科1井盐膏层间软泥岩的蠕变速度对钻井液密度具有很强的敏感特性,从而确定对易蠕变缩径的地层采用先释放后平衡地层应力的技术,保证了电测和下套管需要的安全时间。试验表明,钻井液密度提至2.27-2.30 kg/L时,获得了50 h套管安全下入时间,成功完成了下套管和固井作业。Well Shengke-1,with the well depth of 7026m,φ339.7 mm intermediate casing string of completed depth of 2922.78m,and φ311.1 mm large hole of 4155m,is a scientific exploration well drilled in Shengli Oilfield by Sinopec.The penetration rate was increased by using the laddering large hole casing design and optimized drill bits.In order to solve the casing collapse due to salt-gypsum beds,the φ250.8mm（thick wall 15.88mm） VM140HCVA imported high anti-collapse casing was used in all the open hole section,along with the liner completion technique.According to the drilled formations of salt-gypsum beds,soft shale beds,gypsum-shale beds,red shale beds which are easily prone to hydrate and swell,it was found that the creep rate of salt-gypsum beds in Well Shengke-1 was very sensitive to the drilling fluid density based on the analysis of the its creep.Therefore releasing the formation stress first and balancing it second technique was used in the formation which are prone to creep and swell to make sure the safety of the well logging and casing running.The experiments indicate that,with the drilling fluid density in the range of 2.27-2.30g/cm^3,50 h was obtained to run the casing the cementing successfully.

关 键 词：深井钻井 钻井液 盐膏层 钻具组合 胜科1井 胜利油田 

分 类 号：TE249[石油与天然气工程—油气井工程]