超高压气井井身结构设计技术  

CASING PROGRAM DESIGN FOR ULTRAHIGH-PRESSURE GAS WELLS

作　　者：廖忠会[1] 王希勇[1] 

机构地区：[1]中国石化西南油气分公司工程技术研究院

出　　处：《天然气工业》2008年第10期64-66,共3页Natural Gas Industry

基　　金：中国石化西南油气分公司重点科研项目(编号:GJ-49-0509)的资助

摘　　要：超高压气田在我国分布较为广泛,其主力产层因沉积环境一般埋藏较深,最深达到8000m以上,地层复杂,往往存在喷、漏、塌以及含H2S等复杂情况,超高压气井钻井工程井身结构设计非常困难。为解决超高压气井井身结构设计主要存在的"深井或超深井,套管管材应力水平高,在含H2S条件下安全余量小"的问题。提出超高压气井井身结构设计技术应根据地层压力系统和井下复杂情况来确定必封点,增大完井尺寸和提高上部大尺寸套管的强度,井身结构采用自下而上和自上而下相结合的方法进行设计;进行深部井眼钻具强度校核和水力参数计算时,应结合钻机选型和钻井工艺技术,对套管选型和强度校核以及套管安全下入技术进行评估。Ultrahigh-pressure gas fields are widely distributed in China.Because of the sedimentation environment,the major payzones of those gas fields normally have deep burial depth up to over 8000 m with complicated formation.Blowouts,lost circulations,wellbore sloughing,and H2S hazards often occur,making casing program design for ultrahigh-pressure gas well drilling extremely difficult.Targeting on the major problems as ' deep or ultra-deep well drilling,high stress level on casing tubulars,and small safety margin in H2S environment',it is recommended to determine the isolation interval according to the formation pressure system and downhole conditions,to increase the completion size,to increase the rated strength of upper large-size casing string,and to design the casing program both from top to bottom and from bottom to top when designing the casing program for a gas well.And when doing strength calibration for drilling tools used in deeper wellbore and when calculating the hydraulic parameters,the rig model and drilling technology to be used should be taken into account to evaluate the casing selection,strength calibration,and safe casing running.

关 键 词：深井 超深井 超高压气井 套管 井身结构设计 

分 类 号：TE22[石油与天然气工程—油气井工程] TE242.9