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Liu, Huanan
- Colloidal Carbon Beads as Lubricant Additives in Water Based Drilling Fluid
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PDF Views:258
Authors
Affiliations
1 College of Construction Engineering, Jilin University, Changchun-130021, CN
2 Lubei Geo-Engineering Exploration Institute, Shandong Province-253015, CN
3 School of Prospecting and Surverying Engineering, Changchun Institute of Technology, Changchun-130021, CN
1 College of Construction Engineering, Jilin University, Changchun-130021, CN
2 Lubei Geo-Engineering Exploration Institute, Shandong Province-253015, CN
3 School of Prospecting and Surverying Engineering, Changchun Institute of Technology, Changchun-130021, CN
Source
International Journal of Earth Sciences and Engineering, Vol 10, No 4 (2017), Pagination: 787-792Abstract
The friction related to bit wear, torque and drag greatly hinder the efficiency for a drilling operation. Colloidal carbon beads, synthesized by a facile solvothermal method, are investigated as an additive for improving the tribological performance. The application and tribological behavior of carbon beads as lubricant additives in water-based drilling fluid are estimated following a standard API/Baroid lubricity tester., the lubricity coefficient of composites of bentonite and carbon beads is lower even at a concentration of 0.2% (wt) compare to the concentration of 3% (wt) graphite powder. The coefficients of friction of carbon beads at different concentrations in water under 1.0 N normal load show significant improvement in its lubricity, reduced about 48% at the concentration of 0.8% (wt) compared to pure water. The rolling mechanism similar to nano or micro scale ball bearings of carbon beads can be pro-posed to account for the lower friction and wear performance.Keywords
Carbon Beads, Lubricant, Drilling Fluid.Full Text
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- Experimental Application on Reverse Circulation Drilling Technology with DTH Air Hammer in an Open Pit Mine in Sichuan
Abstract Views :181 |
PDF Views:126
Authors
Affiliations
1 College of Construction Engineering, Jilin University, No. 938 Ximinzhu Street, Changchun-130021, CN
1 College of Construction Engineering, Jilin University, No. 938 Ximinzhu Street, Changchun-130021, CN
Source
International Journal of Earth Sciences and Engineering, Vol 9, No 3 (2016), Pagination: 906-911Abstract
The technology of reverse circulation drilling with DTH air hammer which has shown lots of peculiarities such as high drilling efficiency, good quality of borehole and unique adaptability of complex formation has been widely used in developed countries. In the paper, we have carried out analysis and research on the flow field model inside the holes of reverse circulation bit without bottom injection hole and double hole reverse circulation bit. The research shows: reverse circulation bit without bottom injection hole is 21% higher than reverse circulation bit with bottom injection hole in respect of flow speed injected from the interior injection hole. In the central channel beneath the interior injection hole, the upward flow speed of reverse circulation bit without bottom injection hole is higher than that of double hole reverse circulation bit, and its speed remains constant. So it shows than reverse circulation bit without bottom injection hole has an advantage over double hole reverse circulation bit. In order to test effect of reverse circulation with different drilling assembly, the technology of reverse circulation drilling with DTH air hammer is adopted to carry on a series of field tests in an open pit mine in Sichuan. Finally, the conclusion of this paper from onsite test is: the average drilling speed of drilling machines with reverse circulation bit without bottom injection hole is 8.83 m/h, and has very good reverse circulation results.Keywords
DTH Hammer, Reverse Circulation Drilling, Open Pit Mine, Complex Formation.Full Text