气体钻井地层出水工况实验模拟研究  

EXPERIMENTAL SIMULATION RESEARCH ON FORMATION WATER PRODUCTION DURING GAS DRILLING

作　　者：杨旭[1] 李皋[1] 孟英峰[1] 刘博伟[1] 刘金龙[1] 

机构地区：[1]"油气藏地质及开发工程"国家重点实验室.西南石油大学

出　　处：《钻采工艺》2013年第2期9-11,147,共3页Drilling & Production Technology

基　　金：国家自然科学基金重点项目"气体钻井技术基础研究"(编号:51134004);"西南石油大学青年科研创新团队"基金(编号:2012XJZT003)的资助

摘　　要：气体钻井技术在提高机械钻速、保护储层等方面具有其独特的优势。然而,当地层出水以后,由于泥页岩地层黏土水化,极易引发黏附卡钻、井壁失稳等井下复杂情况。为此,针对气体钻井地层出水问题,开展了气体钻井地层出水工况实验模拟研究。通过室内建立的可视化实验装置,模拟分析了低产水工况下的气体携液问题,并对气体钻井地层出水时井底气液混合流动情况以及井筒环空成膜情况进行了研究。实验结果表明,气液混合后,井底液体主要形成波状液膜,而环空液体主要以液膜和液滴的形式存在,同时环空携液能力决定了液膜厚度和液滴尺寸。通过对地层出水工况下气体携液能力进行分析表明,理论携水量与实验结果相符,当携水量较大时,环空液膜较厚、液滴尺寸较小,且波动更剧烈,使环空压降增加。Gas drilling has the unique advantages of improving penetration rate, protecting reservoirs, etc. But the formation water production may result in adhesion sticking, borehole instability or other downhole complications due to mud shale formation clay hydration. According to the problem of formation water production, the experimental simulation research on formation water production during gas drilling was done. The liquid-carrying problem in low water production conditions was analyzed by the visualization experimental device and the situations of downhole gas-liquid flow and annular film in formation water production conditions were studied. The experimental results indicated that the existence form of bottom hole liquids were wave liquid films after mixed with gases, while liquids in annular are mainly liquid films and droplets, and the thickness of the annular liquid film and the size of the droplet were related to the annular liquid-carrying capacity. The liquid-carrying capacity of gas was analyzed under formation water production conditions, the results demonstrated that the experimental water-carrying quantity agrees with the theoretical water-carrying quantity.

关 键 词：气体钻井 地层出水 模拟实验 携液能力 环空压降 研究 

分 类 号：TE242.6[石油与天然气工程—油气井工程]