International Journal of Engineering Sciences and Technologies,Vol.4, Iss. 4 (2026) - 2 articles

Subsurface safety valves (SSSVs) are critical components of wellbore integrity systems and serve as essential downhole safety barriers for oil and gas production. By rapidly shutting off the production conduit under abnormal conditions, such as wellhead failure, blowouts, or uncontrolled formation fluid flow, SSSVs effectively prevent major safety accidents and enviro... Read more.

Objectives The Dengying Formation gas reservoirs in the Sichuan Basin are characterized by great burial depth, multiple superimposed pressure systems and strong reservoir heterogeneity. During drilling, risks such as the coexistence of kick and lost circulation, borehole collapse and pipe sticking, high temperature and high pressure (HTHP), and sour-gas well control ... Read more.