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为了勘探和开发地热资源及深部矿产,3000米以上的深孔钻探发展很块.目前已完成2000余口地热井,完成了钻深为7800多米的钻孔,设计7000米以上的钻孔正在加块施工. 地热钻探所钻地层,由于地温变化异常,几百米的钻孔孔底温度可达140℃以上.钻孔越深,孔底温度越高,按平均地温梯度推算:3000米的孔底温度为90～120℃,5000米为210～250℃.地温越高,钻孔越深,技术上的难度越大.因此钻孔深度是衡量钻探技术水平的重要标志之一.高温条件下的钻进实践证
In order to explore and develop geothermal resources and deep mineral resources, the development of deep-hole drilling over 3000 meters is very large.At present, more than 2000 geothermal wells have been completed and the drilling depth of more than 7,800 meters has been completed. Block construction.Geothermal drilling of the formation, due to abnormal temperature changes, a few hundred meters of the bottom of the hole temperature up to 140 ° C. Drilling deeper hole bottom temperature is higher, according to the average geothermal gradient calculation: 3000 meters hole The bottom temperature is 90 ~ 120 ℃, and the 5000m is 210 ~ 250 ℃. The higher the ground temperature, the deeper the drilling, the greater the technical difficulty.Therefore, the drilling depth is one of the important indicators to measure the drilling technology.High temperature Drilling practice certificate