高含硫气井中的硫沉积规律  

Sulfur deposition law in gas wells with high sulfur content

作　　者：丁健 石在虹[2] 牛骏[2] 韩冬深[3] 张磊[4] 顾庆东[4] 

机构地区：[1]中国海油伊拉克有限公司,北京100010 [2]中国石油化工股份有限公司石油勘探开发研究院,北京100083 [3]辽河油田钻采工艺研究院,辽宁盘锦124010 [4]华北油田公司采油工程研究院,河北任丘062552

出　　处：《石油钻采工艺》2014年第4期79-83,共5页Oil Drilling & Production Technology

基　　金：国家863计划课题"高温高压;高含H2S/CO2气田井下管柱腐蚀与防护技术"(编号:2007AA06Z207)部分研究成果

摘　　要：针对高含硫气井井筒硫析出、硫沉积预测难题,建立了高含硫气井井筒多相流动和传热数学模型,给出了多场耦合井筒硫析出、硫沉积判别准则和计算方法。计算结果表明,高含硫气井从井底至井口硫溶解度逐渐减小,呈非线性变化规律;井筒中伴随有硫析出,析出位置及析出量主要受温度梯度、压力梯度和硫化氢质量浓度等影响;井筒中的硫沉积主要受气体携带能力和局部流场扰动的影响。温度、压力下降越大,硫析出越早;在同一流压下,产气量越高,硫析出越早,析出量越大。该研究模拟了气井生产动态,给出了高含硫气井中的硫析出、硫沉积、压力及温度分布规律,计算结果可用于指导现场进行开发方案调整、生产参数优化,为制定硫沉积预防方案提供依据。In consideration of the difficulties of sulfur release and deposition prediction in wellbores with high content of sulfur, amathematical model was built for multi-phase fluid flow and heat transfer in gas wells with high content of sulfur, and a discriminationrule and computing method were given for multi-field coupling sulfur release in wellbore and sulfur deposition. The computing resultsshow that the sulfur solubility from hole bottom to wellhead in gas well with high sulfur content decreases gradually, showing non-linearvariation; sulfur release occurs in the wellbore, and the precipitation location and amount are mainly affected by temperature gradient,pressure gradient and H2S mass concentration; and sulfur deposition in wellbore is mainly affected by gas carrying capacity and localflow field disturbance. The greater the temperature and pressure decrease, the earlier the sulfur precipitates; under the same flow pressure,the higher the gas production is, the earlier the sulfur precipitates and the greater the precipitation is. This study simulates the productionperformance of gas wells and gives the distribution law of sulfur release, sulfur deposition, pressure and temperature in gas wells withhigh sulfur content; the calculation results may be used to provide guidance for field adjustment of development scheme and optimizationof production parameters and provide basis for formulating a scheme to prevent sulfur deposition.

关 键 词：高含硫 气井 硫析出 硫沉积 

分 类 号：TE34[石油与天然气工程—油气田开发工程]