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- Title
CHARACTERISTICS OF A NON-CIRCULATING TRANSIENT FLOW DURING GAS INVASION IN THE UNDERBALANCED DRILLING PROCESS.
- Authors
WEI, Na; MENG, Ying-Feng; LIU, An-Qi; LI, Hai-Tao; JIANG, Lin; ZHENG, Li-Jun; FU, Qiang; LV, Xin
- Abstract
The wellbore flow in a liquid-based underbalanced drilling process consists of a steady multiphase flow during normal drilling and a transient gas-liquid flow without mud-cycling. The theory of steady multi-phase flow has been used to calculate the pressure profile of normal drilling. Therefore, it is vital to figure out how to calculate the transient pressure variation caused by formation fluid flowing into wellbore when the mud-cycling is stopped. In this paper, a numerical simulation method and a mathematic model are established to study the wellbore flow and to control pressure during the underbalanced drilling process with liquid- based mud. The results also shed a light on the hidden mechanism of this special flow.
- Subjects
GAS flow; MULTIPHASE flow; SIMULATION methods &; models; FLUID flow; PRESSURE control; TRANSIENTS (Dynamics); BORING &; drilling (Earth &; rocks)
- Publication
Thermal Science, 2019, Vol 23, Issue 4, p2257
- ISSN
0354-9836
- Publication type
Article
- DOI
10.2298/TSCI1904257W