TY - JOUR
TI - Simulation and analysis of wellbore stability for drilling wells in deep and complex formations
AU - Zhao Ke
AU - Wang Jin-Tang
AU - Liao Bo
AU - Cai Wen-Hui
AU - Liu Lei
AU - Sun Jin-Sheng
JN - Thermal Science
PY - 2025
VL - 29
IS - 2
SP - 1515
EP - 1519
PT - Article
AB - Deep and ultra-deep drilling has become the key direction of oil and gas  exploration and development research at the present stage. The density  window of deep and complex formations is narrow, and most of the wells  drilled are high temperature and high pressure wells, which have a large  impact on the density and rheological parameters of drilling fluids and  further affect the stabilization state of the wall of the well after the  intrusion of drilling fluids into the formation. Therefore, this paper  comprehensively applies the knowledge of heat transfer, applied  mathematics, and computer science to analyze the temperature change of the  whole well section and the change of physical properties parameters of  drilling fluids in deep formations, and judging the degree of wall  instability by introducing the wellbore yield state parameter, and carrying  out the simulation and analysis of wall stability in drilling wells of deep  and complex formations, and optimizing the design of the selection of the  performance parameters of drilling fluids in the subsequent wells.