| 贵州毕节市CK1地热勘探井钻井技术分析 |
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| 引用本文： | 杨风良.贵州毕节市CK1地热勘探井钻井技术分析[J].地质与勘探,2017,53(5):1017-1024. |
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| 作者姓名： | 杨风良 |
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| 作者单位： | 1. 河北省煤田地质局第二地质队 河北邢台 054001;2. 中国地质大学(北京),地球科学与资源学院 北京,100083 |
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| 摘 要： | 本文通过对贵州毕节市CK1地热井的特点及施工的研究,有效解决了高陡构造地层钻进问题。该井开孔即见基岩,常规工艺加压困难,难以保证孔斜;下部钻孔岩石硬度大,研磨性较强,可钻性差。通过分阶段变化钻进工艺,上部开孔使用空气潜孔锤吊打,后期采用牙轮钻头加螺杆钻具组合,在钻井效率过低的复杂地层则简化钻具组合,使用牙轮正循环工艺钻进,合理调整钻进参数可迅速建井。通过使用有准对性的洗井方法可迅速成井。本文通过对地热井多工艺钻进及完井工序的要求及改进,并针对现地勘单位对地热资源开发的实际情况进行了总结和分析,找出存在的问题及解决办法。本次研究为地热田的开发总结了经验。
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| 关 键 词： | 地热井 勘探 钻井 洗井 毕节 贵州 |
| 收稿时间： | 2016/11/23 0:00:00 |
| 修稿时间： | 2017/5/10 0:00:00 |
The analysis of drilling technology applied to the CK1 geothermal exploration well No.1 in Bijie City, Guizhou Province |
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| Yang Feng-Liang.The analysis of drilling technology applied to the CK1 geothermal exploration well No.1 in Bijie City, Guizhou Province[J].Geology and Prospecting,2017,53(5):1017-1024. |
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| Authors: | Yang Feng-Liang |
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| Abstract: | This work made analysis of characteristics of the CK1 geothermal well in Bijie city, Guizhou and conducted on-site drilling experiments. The purpose is to solve the problem how to effectively drill in strata with highly steep structure. As the drilling of this borehole encountered bedrock from its beginning, the conventional pressure-applying was difficult, which made it impossible to guarantee the hole oblique. The rock at the hole bottom was hard with strong abrasive nature, thus not easy to drill through. To tackle these problems, the drilling technology with phase change was employed, in which the air DTH hammer bit was used in opening the upper hole, and the combination of cone bit and screw drill tool was adopted in later drilling. In the complex strata where the drilling efficiency was very low, the bit assembly was simplified, using the roller-based positive cycle, and reasonable adjustment of drilling parameters to realize quick well construction. With focused well flushing, such a well building could be accomplished fast. This paper analyzed the requirement of the geothermal well drilling and completion process and improvement, as well as the current real situation of geological prospecting units. It pointed the existing problems and proposed measures to solve them, providing an experience for exploitation of geothermal resources. |
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| Keywords: | geothermal well exploration drilling well washing Bijie City Guizhou |
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