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| Preparation and application of anti-sloughing agent based on resource utilization of oil sludge for drilling fluid |
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CHAI Jinpeng, LIU Junyi, QIU Zhengsong, GUO Baoyu, ZHONG Hanyi, CAI Yong, HE Chang1,2,3,4
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1. College of Petroleum Engineering in China University of Petroleum, Qingdao 266580, China;2. Drilling Engineering and Technology Company, Shengli Petroleum Engineering Corporation Limited, SINOPEC, Dongying 257064, China;3. Post-Doctoral Research Center of Shengli Oilfield, SINOPEC, Dongying 257064, China;4. Shengkai Company, Petroleum Development Center of Shengli Oilfield, SINOPEC, Dongying 257064, China
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| Abstract: |
| One anti-sloughing agent (SD-AS) with high oil soluble rate (≥ 50%) and adjustable softening point (50-120℃) was prepared based on asphaltization and emulsification of the oil sludge as raw material. The comprehensive performance of SD-AS was evaluated by permeability plugging test, scanning electron microscope, pressure transmission test and contact angle test. And the anti-sloughing mechanism of SD-AS was also investigated.Furthermore, the formula of anti-sloughing water-based drilling fluid was optimized based on the development of the anti-sloughing agent (SD-AS). The results indicate that the anti-sloughing agent (SD-AS) could be deformable to internally seal pore or micro-fractures to reduce fluid pressure penetration. The chemical adsorption of SD-AS could also render the shale more hydrophobic to further improve the anti-sloughing properties of SD-AS. The anti-sloughing water-based drilling fluid is successfully applied in drilling operation of Junggar Basin with the average hole enlargement rate of 6.78%. |
| Key words: oil sludge resource utilization drilling fluid anti-sloughing agent field application |
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