邻井气举辅助泡沫排水采气工艺起效时间探究  

Onset time of lift-assisted foam drainage gas recovery in adjacent wells

作　　者：翟中波 陈刚[2] 朱智贤 常渭涛 张曙辉 ZHAI Zhongbo;CHEN Gang;ZHU Zhixian;CHANG Weitao;ZHANG Shuhui(Schlumberger Copower Oilfield Services Co.,Ltd,Xi’an,Shanxi 710021,China;Yanchang Petroleum Group Gas Field Company,Yan’an,Shaanxi 716002,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China)

机构地区：[1]斯伦贝谢长和油田工程有限公司,陕西西安710021 [2]陕西延长石油(集团)有限责任公司气田公司,陕西延安716002 [3]油气藏地质及开发工程国家重点实验室·西南石油大学,四川成都610500

出　　处：《天然气勘探与开发》2024年第2期68-72,共5页Natural Gas Exploration and Development

摘　　要：为了提升常规泡沫排水采气的效果,在对积液气井环空加注泡排剂的同时,使用邻井天然气对积液气井环空进行注气,即邻井气举辅助泡排新工艺。新工艺泡排剂起效时间决定关井时间和采气时率,对气井生产有重要的影响,目前行业内对此研究处于空白状态。在已有致密气井间歇泡排注剂后关井时间探究的基础上,依据注入泡排剂之后井口压力、气量和温度变化趋势来判定泡排剂下行时间和扩散时间,从而确定泡排剂的起效时间,并与常规泡排剂加注方式进行对比,分析了新工艺的优点及其原因。研究结果表明:①常规环空泡排注剂和邻井气举辅助泡沫排水采气工艺注剂后泡排剂的流动形态不一样,前者泡排剂呈“线状”,沿“静态”环空的油套管壁下行;后者泡排剂会以“液滴状”,在进入积液气井“动态”环空之后,随着邻井天然气迅速下行;②新工艺可以显著缩短泡排剂的起效时间,从8.2 h缩短至1.1 h,效率提高了86.6%,因借助注入的天然气对积液气井进行气举,排液效果更好,常规注剂不能复产的低产、低压气井借助新工艺可以正常恢复生产。为低产低压气井的排水采气提供了一种新思路,值得进一步推广应用。An innovation of lift-assisted foam drainage gas recovery in adjacent wells has been put forward to make conventional foam recovery more useful,that is,injecting gas from the next wells into annular in one gas well with liquid accumulation while foam agent into this annular.For the innovation,the agent’s onset time is important for well production because it may control both shut-in time and gas production rate.Nevertheless,there is no such study in the industry.Thus,based on available discussion on the shut-in time after intermittent injection of foam agent in tight gas wells,both traveling and dispersion time of this agent was judged in line with changes in wellhead pressure,gas flow and temperature after foam injection,and then the onset time could be determined.Moreover,compared with conventional foam-agent injection,the advantages and principles were analyzed for this new process.Results show that(i)for two kinds of foam agent individually used in conventional and new processes,the flow pattern is different.The agent in the conventional process represents a linear downward travel along oil casing wall with“static”annulus.While that of the innovation travels like liquid droplet downward rapidly along with gas from the adjacent wells after entering the“dynamic”annulus in the gas well with liquid accumulation;and(ii)this innovation may significantly shorten the onset time to 1.1 h from 8.2 h,implying an increase of efficiency by 86.6%.Better drainage can be gained through lift in the liquid accumulation well assisted by injecting gas from the next wells.It not only enables some with low production and pressure to resume normal production but provides fresh ideas for water drainage recovery in them,which is worth to popularize.

关 键 词：气井积液 泡沫排水采气 邻井气举辅助 下行时间 扩散时间 

分 类 号：TE377[石油与天然气工程—油气田开发工程]