产水气井油管隔热保温技术研究与应用  

Technology of Thermal Insulation Tubing for Water-producing Gas Wells

作　　者：周舰[1] 王斌[1] 谭苗 ZHOU Jian;WANG Bin;TAN Miao

机构地区：[1]中国石化华北油气分公司石油工程技术研究院,河南郑州450006

出　　处：《天然气技术与经济》2019年第1期30-33,82,共5页Natural Gas Technology and Economy

基　　金：国家科技重大专项"低丰度致密低渗油气藏开发关键技术"(2016ZX05048)

摘　　要：产水气井在高压、低温条件下容易生成水合物而堵塞井筒和采气管线,通常采用注甲醇来实现解防堵的目的,但注甲醇解防堵工艺存在甲醇有毒、含醇污水处理工艺复杂和运行成本高等诸多弊端。为此,创新采用井下隔热保温组合油管代替单一普通油管用作生产管柱来提高井口流体温度、避免井筒堵塞。研究表明:(1)研制的井下隔热保温油管,减少了地层能量沿井筒热损失,可有效提高井口流体温度,实现了防治水合物生成的目的,同时井下隔热保温油管与常规油管配合使用,可在一定程度上降低采气成本;(2)对隔热保温油管的敏感性分析表明,井下隔热保温油管下入深度越大、导热系数越小,井筒保温效果越好,且井下隔热油管下入深度对井筒温度的影响要远大于其导热系数。现场应用表明:东胜气田Y井采用井下隔热保温油管后,井筒流体升温明显,井口流体温度提高了近30℃,有效防治水合物生成,能够满足气田环保开发需求,为产水气井提供了一种环保型水合物防治新方法。Under high pressure and low temperature,most water-producing gas wells very easily generate hydrate to block up wellbore or pipelines.The common-used way of plugging removal is methanol injection.However,there are also some problems of methanol toxicity,complicated waste water treatment,and higher operation cost.Research shows that(1)taking the place of single and simple tubing,an innovative downhole thermal insulation tubing,as production string,has been developed to increase temperature of fluid at wellbore,to avoid wellbore plugging,and to cut down cost to some extent;(2)the deeper the tubing has down depth,the better wellbore thermal insulation is and the smaller thermal conductivity coefficient is,the better wellbore thermal insulation is,one effect of down depth on wellbore temperature is much larger than another one on thermal conductivity coefficient.It is deemed that,after its application to Y well,Dongsheng gasfield,the temperature of wellbore fluid obtained an obvious increase,rising to 30℃ to effectively prevent from hydrate generation and to meet the demand of better field development,all providing a new tool for water-producing gas wells.

关 键 词：产水气井 隔热油管 井筒保温 水合物防治 临界携液气流量 

分 类 号：TE931.2[石油与天然气工程—石油机械设备]