高温高压含硫气井环空流体热膨胀带压机理  

Mechanism of annular fluid thermal expansion pressure in HTHP sour gas wells

作　　者：车争安[1,2] 张智[1] 施太和[1] 涂军军[3] 向亮[1,4] 刘乃震 

机构地区：[1]"油气藏地质及开发工程"国家重点实验室.西南石油大学 [2]中海油能源发展股份有限公司监督监理技术分公司 [3]中国石化西南油气分公司工程监督中心 [4]中国石油长城钻探工程公司

出　　处：《天然气工业》2010年第2期88-90,共3页Natural Gas Industry

基　　金：国家科技支撑计划(编号:2008BAB37B03);国家科技重大专项项目(编号:2008ZX05017-002-02-01)

摘　　要：在高温高压含硫气井中,环空带压值过大将会影响正常生产,一旦超过允许值将诱发潜在的安全事故。针对开采过程中井筒温度升高使密闭环空流体受热膨胀而导致的环空带压问题,建立了高温高压含硫气井环空流体热膨胀带压值的计算模型,并进行了实例计算。结果表明,高温高压含硫气井环空流体热膨胀引起的带压值很有可能会引起生产管柱的失效,给油气井安全生产带来威胁。因此,有必要在井身结构设计、套管强度设计与环空保护液优选时,根据油气井正常开采的工作制度,降低开采过程中环空带压值并开展有效的环空带压管理,确保高温高压含硫气井的长期安全生产。In HTHP sour gas wells,over-high pressure in annulus will affect normal production.Once it exceeds the allowable limit,potential safety hazards will be evoked.In view of high pressure problem resulting from thermal expansion of annulus fluid due to the temperature increase during the production period,a calculation model was established for that pressure in HTHP sour gas wells.And case studies were then made.The results show that the heat-induced annulus pressure can cause failure in production pipe string,posing threat to safe production.So when doing casing program planning,casing strength designing,and optimal annulus fluid determining,we had better to reduce the production-heat-induced annulus pressure and to manage the annulus pressure effectively while maintaining normal operation system,so as to ensure long-term safe production in HTHP sour gas wells.

关 键 词：环空带压 硫化氢 高温高压 套管 气井 安全 热膨胀 

分 类 号：TE357[石油与天然气工程—油气田开发工程]