天然气工业2017，Vol.37Issue(4)：130-134,5.DOI:10.3787/j.issn.1000-0976.2017.04.016
盐穴地下储气库排卤管柱盐结晶影响因素实验研究
An experimental study on the influencing factors of salt crystal in brine discharge strings of a salt-cavern underground gas storage (UGS)
摘要
Abstract
When the injection-production wells of a salt-cavern underground gas storage (UGS) is at the stage of gas injection and brine discharge,crystal is precipitated from the saturated brine in brine discharge strings.Consequently,crystal occurs on the inner walls of brine discharge pipes,brine discharge rate decreases,the time and cost of gas injection and brine discharge increases,and even the brine strings may be blocked completely by the salt crystal and the production is stopped.In this paper,the reasons for salt crystal of brine were analyzed.It is indicated that supersaturation,temperature,flow rate of brine and surface roughness of the inner wall of brine discharge pipes are the main factors influencing the salt crystal of brine in brine discharge strings.Then,experiments were accordingly designed.It is revealed that salt crystal of brine is affected by temperature.When brine flows at a low rate in the brine discharge pipe,crystal will occur on the inner wall if the temperature drops by 1 ℃.Besides,as the brine discharge rate decreases,the fluid shear decreases,the generated salt crystal is structurally more stable and crystallization is more obvious.Moreover,in the same conditions,the smoother the inner wall surface of brine discharge pipe is,the less the salt crystal is generated on the inner wall because the newly generated crystal nucleus cannot be adhered and grow easily.It is demonstrated that the pipe blocking caused by salt crystal can be prevented and solved by taking some measures in the process of gas injection and brine discharge in the salt-cavern UGS,such as by carrying out back flush with high-temperature fresh water at a low flow rate,by increasing gas injection temperature and by painting the inner wall of brine discharge pipes.关键词
盐穴地下储气库/注气排卤/管柱晶堵/影响因素/过饱和度/温度/卤水流速/表面粗糙度/解堵Key words
Salt cavern underground gas storage/Gas injection and brine discharge/Crystal blocking of pipe strings/Influential factor/Supersaturation/Temperature/Flow rate of brine/Surface roughness/Plug removal引用本文复制引用
金虓,夏焱,袁光杰,庄晓谦,班凡生,董安琪..盐穴地下储气库排卤管柱盐结晶影响因素实验研究[J].天然气工业,2017,37(4):130-134,5.基金项目
中国石油天然气集团公司研究课题“储气库优快钻完井技术与装备研究”(编号:2015E-4003)、中国石油集团钻井工程技术研究院研发课题“盐穴储气库关键技术研究”(编号:DR201507). （编号:2015E-4003）
