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Sun, Youhong
- Colloidal Carbon Beads as Lubricant Additives in Water Based Drilling Fluid
Abstract Views :893 |
PDF Views:256
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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- Design and Preliminary Field Experiment of Hydraulic Borehole Mining Tool with Expandable Nozzle
Abstract Views :218 |
PDF Views:125
Authors
Affiliations
1 College of Construction Engineering, Jilin University, Changchun-130061, CN
2 Key Lab of Drilling and Exploitation Technology in Complex Conditions, Ministry of Land and Resource, Changchun-130061, CN
3 College of Applied Technology, Jilin University, Changchun-130061, CN
1 College of Construction Engineering, Jilin University, Changchun-130061, CN
2 Key Lab of Drilling and Exploitation Technology in Complex Conditions, Ministry of Land and Resource, Changchun-130061, CN
3 College of Applied Technology, Jilin University, Changchun-130061, CN
Source
International Journal of Earth Sciences and Engineering, Vol 10, No 3 (2017), Pagination: 473-477Abstract
Hydraulic Borehole Mining (HBM) method is an important mining technology that has advantage for some special ore formation. However, the traditional hydraulic borehole mining tool’s nozzle is fixed that limits the single well ore production. In this paper, hydraulic borehole mining tool with ratchet controlled expandable nozzle was designed. High pressure water channel, ore pulp discharge channel and ratchet controlled expandable nozzle are three important parts in this design process. Then, the tool was conducted preliminary filed experiment in nong’an area and infrared camera was used to observing breaking condition of the wall of experiment hole. The experiments showed that the ratchet controlled expandable nozzle can expand and back in the experiment hole. And the hydraulic borehole mining tool can break the wall of experiment hole obviously. This research is a preliminary study that provides an ideal mining method and mining tool for thin ore formation.Keywords
Hydraulic Borehole Mining, Expandable Nozzle, Design and Field Experiment, Ore Particles.Full Text
- Effect of Gelled Acid Fracturing Fluid on the Structure and Pyrolysis Behavior of Oil Shale
Abstract Views :168 |
PDF Views:116
Authors
Affiliations
1 College of Construction Engineering, Jilin University, No.6 Ximinzhu Str., Changchun-130026, CN
1 College of Construction Engineering, Jilin University, No.6 Ximinzhu Str., Changchun-130026, CN
Source
International Journal of Earth Sciences and Engineering, Vol 9, No 1 (2016), Pagination: 59-65Abstract
This paper simulates the application of gelled acid fracturing in the in-situ conversion of oil shale. Oil shale samples with sizes of 3-5 mm were immersed in and treated with gelled acid fracturing fluid. The samples were tested by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and mercury intrusion porosimetry (MIP) before and after the acid treatment. The results show that the mineral compositions and distribution of the porosity were significantly different in the treated samples (OST) and the raw samples (OSR). SEM images show that the OST surfaces were rough and porous. The MIP analysis determined a porosity of 0.142 for the OST samples, whereas the porosity of the OSR samples was only 0.050. Thermogravimetric analysis (TGA) showed that the OST samples had a significantly higher thermal weight loss rate than the OSR samples. The Fischer assay showed that the oil yield increased from 26% to 29.2% after treatment with the acid fracturing fluid. Gas chromatography-mass spectrometry (GC-MS) analysis showed that the shale oil which was obtained from the OST samples contained higher levels of low molecular weight products. The OSR and OST samples had different thermal decomposition kinetic parameters, the thermal decomposition activation energies at 420°C-480°C were 131 KJ/mol and 127 KJ/mol, respectively, which indicates that the acid treatment slightly decreased the thermal decomposition activation energy.Keywords
Oil Shale, Gelled Acid, Micropore, Pyrolysis, Oil Yield.Full Text
- Study and Numerical Simulation of a Pyrolysis Technology for the In Situ Conversion of the Nong’an Oil Shale
Abstract Views :140 |
PDF Views:128
Authors
Affiliations
1 College of Construction Engineering, Jilin University, No.6 Ximinzhu Str., Changchun-130026, CN
1 College of Construction Engineering, Jilin University, No.6 Ximinzhu Str., Changchun-130026, CN
Source
International Journal of Earth Sciences and Engineering, Vol 9, No 1 (2016), Pagination: 157-162Abstract
In light of the pilot project on the in situ conversion of the Nong’an oil shale and the actual geological condition of the area, this study proposed a new in situ pyrolysis method that combines fracturing and nitrogen injection and introduced the corresponding ground equipment. In building the mathematical model, the technology parameters related to the in situ pyrolysis method were optimized through numerical simulation. This optimization was aimed at reaching the highest possible heat transfer efficiency between the high-temperature nitrogen and the oil shale layer. Simulation results revealed an optimal nitrogen injection flow of 30 m3/h and a high energy utilization ratio that can reach 62.7%. Heating time was set to 125 d to sufficiently pyrolyze the oil shale stratum between the injection-heating well and the production well.Keywords
Oil Shale, In Situ Pyrolysis, High-Temperature Nitrogen, Injection Flow Rate, Heat Transfer Efficiency.Full Text