The return of drilling fluid in large diameter horizontal directional drilling boreholes |
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| Affiliation: | 1. School of Geosciences and Info-Physics, Central South University, Changsha, Hunan 410083, PR China;2. School of Engineering, China University of Geosciences (Wuhan), Wuhan, Hubei 430074, PR China;1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Sichuan, Chengdu, 610500, China;2. Key Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640, China;3. Energy Equipment Research Institute, Southwest Petroleum University, Chengdu, 610500, China;4. School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, 610500, China;5. Southern Marine Science and Engineering Guangdong Laboratory (Zhanjiang), Zhanjiang, 524000, China;6. Engineering Technology Research Institute of Petrochina Southwest Oil and Gas Field Company, Sichuan, Chengdu, 610031, China;7. Engineering and Technology Research Institute of Xinjiang Oil Field Company, Karamay, 834000, China;1. School of Petroleum Engineering, Southwest Petroleum University, Chengdu 610500, China;2. Oil & Gas Fire Protection Key Laboratory of Sichuan Province, Chengdu 611731, China;3. Xi’an Changqing Technology Engineering Co. Ltd, Xi’an 710018, China;4. PetroChina Oil & Gas Pipeline Control Center, Beijing 100007, China;1. China-Pakistan Belt and Road Joint Laboratory on Smart Disaster Prevention of Major Infrastructures, Southeast University, Nanjing 210096, China;2. Trenchless Technology Center, Louisiana Tech University, Ruston, LA 71270, United States;3. SWJTU-Leeds Joint School, Southwest Jiaotong University, Chengdu 611756, China;4. Asoe Hose Manufacturing Inc, Taizhou 225319, China;5. Safety, Environment and Technology Supervision Research Institute of PetroChina Southwest Oil & Gasfield Company, Chengdu 610041, China |
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| Abstract: | The return of drilling fluid (drilling mud) in large diameter horizontal directional drilling (HDD) boreholes is a very important issue related to mud pressure, cuttings transport and pull back force, but this problem has not been fully solved in previous research due to the complexity and uncertainty of downhole conditions. The calculation methods of mud pressure loss in the borehole annulus are briefly introduced and the equation using a Power Law model is adopted to study the drilling mud return. A typical reaming hierarchy of a large diameter HDD project has been used to study the return direction of drilling mud and volumes of drilling mud return to the exit and entry points. The research results disclosed that the drilling mud can return to both exit and entry points at the same time, with a large majority of the drilling fluid returning to the exit point if the reamer is closer to the exit point, and vice versa. A parametric study has been conducted to find out the effect of changing parameters in the calculation equation on the drilling fluid return. The drilling mud return for those boreholes with the exit point and entry point located at different elevations has also been discussed. Finally, different types of reamers and other factors such as borehole collapse and borehole shape were taken into the consideration of drilling mud return. |
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| Keywords: | Horizontal directional drilling Drilling fluid Drilling mud pressure Mud return Reaming |
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