Evaluation of circulating temperature in wellbores using drilling microchips: Modeling and case studies
Dokhani, Vahid 1Li, Bodong 2Gooneratne, Chinthaka 2Zhan, Guodong 2Moellendick, Timothy E. 2Shi, Zhaorui1
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作者信息
1. Yu Technol Inc
2. EXPEC Adv Res Ctr
折叠
Abstract
Using cost-effective drilling microchips to collect real-time temperature distribution while drilling is advantageous to accurately predict the variation of drilling fluid density and rheological parameters in wellbore. This study introduces a methodology for analysis of measured temperature of drilling microchips. Multiple sets of drilling microchips were deployed into two wells to measure the distribution of circulating temperature in tubular and annular space. An iterative algorithm is developed to calibrate the time-scale of drilling microchips to depth-scale considering variable pump rates, transit times and slippage of drilling microchips. A transient thermal model is modified to simulate the variation of wellbore temperature during circulation of tracers. It is shown that the velocity of tracers in each interval depends on the flow regime and rheological properties of drilling fluid. Comparing the predicted and actual transit times of tracers, it is realized that the maximum fluid velocity in each interval is a better choice to represent the velocity of tracers. It is shown that predictions of the transient model strongly depend on temperature distribution of the wellbore prior to deployment of tracers. This study provides new insights about the temperature distribution in wellbore while drilling and elaborates on the necessity to address the transient processes particularly during startups in wells with critical downhole conditions.
Key words
Drilling microchips/Tracer tracking/Circulating temperature/Transient thermal model/Flow regime/FLUID TEMPERATURE
NSTL
Elsevier