地层温度对科学超深井井壁稳定的影响  

Effect of the Formation Temperature on the Hole-wall Stability in Ultra-deep Scientific Drilling

作　　者：张培丰 

机构地区：[1]北京探矿工程研究所,北京100083

出　　处：《探矿工程（岩土钻掘工程）》2011年第10期1-5,共5页Exploration Engineering:Rock & Soil Drilling and Tunneling

基　　金：科技部深部探测技术与实验研究专项资助"科学超深井钻探技术方案预研究"(Sino Probe-05-06)

摘　　要：井壁稳定问题包括井壁坍塌和地层破裂2种基本类型,科学超深井钻探的目的层是处于高地应力、高地温和高地层压力的深部岩层,井壁稳定问题更加突出。以12000 m科学超深井为例,从地层温度入手,分析钻井液循环温度变化所引起的当量静态钻井液密度和环空压力当量密度的变化,以及温梯应力、温差应力对井壁稳定的影响。The problem of hole-wall stability includes the well collapsing and the well fracture.The formation of ultra-deep scientific drilling（UDSD） is provided with high stress,high temperature and high formation pressure.The hole-wall stability of UDSD is one of the focuses.Take the example of 12000m UDSD,starting from the formation temperature,analysis was made on the changes of equivalent static density of drilling fluid and annular pressure equivalent density caused by drilling fluid circulating temperature,and on the influence to hole-wall stability by formation temperature-gradient stress and formation temperature-difference stress.

关 键 词：科学超深井 井壁稳定 温梯应力 温差应力 当量静态钻井液密度 环空压力 当量密度 

分 类 号：P634[天文地球—地质矿产勘探]