摘要
在重庆市区及周边乡镇开展的多口地热井钻井施工中,由于大多数取水点地层倾角过大、岩性变化频繁等原因,常规钻井方法无法保障井眼井斜角达标,从而影响获取地热水资源的成功率。采用定向钻井工具进行纠斜钻进时,钻具工具面角与井眼方位角变化值的选择对井眼轨迹的影响尤为重要,同时当钻具工具面角确定以后,新井眼的形成还受地层岩性、钻头选型及钻井参数等各方面的影响。为了井眼轨迹更为平滑,避免形成“狗腿”井段,本文通过对某地热井中定向钻井施工案例进行分析,从实际案例中总结经验,对定向钻井井眼轨迹的可控条件进行了优化。
During the drilling of several geothermal wells in Chongqing urban area and surrounding villages and towns,conventional drilling methods cannot guarantee the borehole inclination after entering the Triassic Xujiahe Formation to reach the standard due to factors such as the large formation dip angle,frequent lithological changes;thus affecting the success rate of obtaining geothermal water resources.When directional drilling tools are used for deviation correction drilling,the selection of the tool face and borehole azimuth change value of the drilling tool has a particularly important impact on the borehole trajectory.At the same time,when the tool face of the drilling tool is determined,drilling a new borehole is also influenced by formation lithology.In order to smooth the well trajectory and avoid the creation of dog legs,this paper analyzes a geothermal well drilling case with directional technology,sums up the field experiences,and optimizes the controllable factors of the directional drilling well trajectory.
作者
翟辉琼
尚亚军
杨建军
孙宇
ZHAI Huiqiong;SHANG Yajun;YANG Jianjun;SUN Yu(Chongqing Yukan Drilling Company, Chongqing 400700, China;Chongqing Geological and Mineral Exploration and Development Bureau 208 Hydrogeological Engineering Geological Team, Chongqing 400700, China;Chongqing Geological and Mineral Exploration and Development Bureau Nanjiang Hydrogeological Engineering Geological Team, Chongqing 400700, China)
出处
《探矿工程（岩土钻掘工程）》
2020年第6期37-41,共5页
Exploration Engineering:Rock & Soil Drilling and Tunneling
关键词
地热井
定向钻井
导向钻井
井斜控制
井眼方位角
钻具工具面角
geothermal well
directional drilling
guided drilling
deviation control
borehole azimuth
tool face of the drilling tool
