基于泡沫流体管流模型的速度管柱排采工艺优化——以川西坳陷中浅层气藏为例  

Optimization of the velocity-string drainage-production technology based on the foam-fluid tube-flow model:A case study on the middle-shallow gas reservoirs in Western Sichuan Depression

作　　者：符东宇 李祖友 鲁光亮 傅春梅[1] 王峻峰 唐雷 FU Dongyu;LI Zuyou;LU Guangliang;FU Chunmei;WANG Junfeng;TANG Lei(No.1 Gas Production Plant,Sinopec Southwest Oil and Gas Company,Deyang 618000,China)

机构地区：[1]中国石化西南油气分公司采气一厂,四川德阳618000

出　　处：《大庆石油地质与开发》2020年第2期72-79,共8页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家科技重大专项“低压低产气藏复杂结构井排水采气关键技术”(2016ZX05048-004-004)。

摘　　要：基于川西坳陷中浅层气藏下有速度管柱气井介入泡沫排液采气工艺后出现的生产异常,建立了速度管柱气井井筒泡沫流模型,模拟了气井速度管柱内气液同产的过程。模型求解结果表明,泡沫流体的黏度会随着泡沫干度的增加而增大,当流态为均质泡沫流时,黏度的增大幅度会加剧,从而引起速度管柱内部流体摩阻增大;速度管柱入口处的压损明显大于上部井段,且管柱尺寸越小该现象越明显。通过参数敏感性分析发现,泡沫流体所受热阻力导致的压损在速度管柱入口处占总压损比例较大,气液比的上升导致热阻力压损占比也随之上升,对于高气液比的速度管柱气井可适度降低泡沫排水采气工艺强度,从而提升气井排液效率。通过对川西气田中浅层气井速度管柱工艺效果进行评价分析以及后期气井维护工艺优化研究,为该区块速度管柱气井后期生产维护措施提供一定的技术指导。In the light of the abnormal gas production appeared after the velocity-string gas well adding to the foam fluid-drainage gas-producing technology for the middle-shallow gas reservoirs in Western Sichuan Depression,the foam flow model was established for the gas well borehole,and the process of the gas-liquid simultaneous production was simulated within the velocity string of the gas well.The simulation solution results show that the viscosity of the foam fluid increases with the rise of the foam quality,when the flow pattern is homogeneous foam flow,the increasing trend will be more serious,consequently,the friction will increase for the fluid within the velocity string;The pressure loss at the inlet of the velocity string is obviously greater than that at the upper section,and this phenomenon will become more obvious with the decrease of the string.The sensitivity analysis of the parameters shows that the pressure loss caused by the thermal resistance of the foam fluid takes up a large proportion of the total pressure loss at the inlet of the velocity string.And the proportion of the thermal resistance pressure loss is also increased due to the increasing gas-liquid ratio,for the velocity string gas well with high gas-liquid ratio,the strength of the foam fluid-drainage gas-producing technology should be appropriately reduced,thus the efficiency of the gas well drainage can be enhanced.The evaluation and analysis of the effects of the technology and the study on the optimization of the later maintaining technology for the middle-shallow gas wells in Western Sichuan Gas Field.

关 键 词：速度管柱 排水采气 泡沫流体 管流模型 川西气田 

分 类 号：TE371[石油与天然气工程—油气田开发工程]