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New method of evaluation and optimization of drilling efficiency while drilling based on mechanical specific energy theory
MENG Ying-feng1,YANG Mou1,U Gao1,LI Yong-jie1,TANG Si-hong2,ZHANG Jun3,UN Si-yuan4
(1.State Key Laboratory of Oil and Cus Geology and Exploration in Southwest Petroleum University, Chengdu 610500, China;2. Engineering Technology Research Institute of Gas PetroCkina, Southwest Oil & Gas Field Company, Guanghan 618300, China;3. Exploration and Devebpment Department of Gas PetroChina, Southwest Oil & Gas Field Company, Chengdu 610500, China;4. Energy Technology & Services, Supervision & Technology Company Limited, Zharyiang 524057,China)
Abstract:
Based on the original rock brewing machine specific energy theory,by analyzing the positive role of hydraulic energy on the rock breaking and bottom-hole clean, a rock breaking specific energy model was established under the conditions of the hydraulic parameters,and the relevant theory was perfected. Based on the relations between rock breaking specific energy mode! and drilling parametei^ and rate of penetration( HOP),appropriate optimizing measures were proposed by analyzing bot-torn-hole conditions of drilling and determining the reasonability of drilling parameters. Meanwhile, ROP can be predicted by further deducing the model. The results show that the established evaluation system of mpxjhanical specific energy efficiency can accurately predict ROP before drilling, diagnose bottom-hole conditions and optimize parameter during drilling, and select bit after drilling. The theory assessment with highly diagnostic accuracy, effective optimizing and simple operation was demonstrated by field examples of rock breaking specific energy. Therefore, it is worthy to be applied and promoted.
Key words:  drilling  mechanical specific energy  drilling efficiency  drilling parameter  optimization method  bottom-hole confining pressure  rate of penetration