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| The minimum gas injection volume model of pneumatic DTH hammer reverse circulation drilling |
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HUANG Yong1,2,3, YIN Kun1,2,3, ZHU Li hong4
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(1.College of Construction Engineering, Jilin University, Changchun 130026, China;2.Laboratory of Technology for Drilling under Complex Condition of Ministry of Land and Resources, Jilin University, Changchun 130026, China;3.Key Laboratory of Geodetection Technology ＆ Instrumentation of Ministry of Land Resources, Jilin University, Changchun 130026, China;4.School of Petroleum Engineering in China University of Petroleum, Qingdao 266555, China)
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| Abstract: |
| According to the characteristics of pneumatic DTH hammer reverse circulation drilling technology, the minimum gas volume flow rate satisfying the minimum capacity of carrying scrap and the minimum bottom hole pressure within the central channel of pneumatic DTH hammer reverse circulation drilling were deduced using the kinetic energy method. Then, the model of the minimum gas volume flow rate of pneumatic DTH hammer reverse circulation drilling was established. Combined with the GQ 320 type DTH hammer practical work, the minimum gas volume flow rates under different penetration rates were obtained and compared with the measured values. The results show that under the condition of formation complete or the loss being not serious, the calculation values of the gas volume flow rate of the pneumatic DTH hammer reverse circulation drilling agree well with the field values. The upward cutting velocity analysis agrees well with the field data, which verifies the reliability of the model. |
| Key words: gas drilling DTH hammer reverse circulation gas injection volume |
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