In this study we evaluate the response of oceanic subsurface systems to thermal stresses caused by the flow of warm fluids through non-insulated well systems crossing hydrate-bearing sediments. Heat transport from warm fluids, originating from deeper reservoirs under production, into the geologic media can cause dissociation of the gas hydrates. The objective of this study is to determine wheth...

Within two hours after discharge began, for a production test in 1989 of well ZCQ-4, pressure variations changed from approximately sinusoidal to a cycle of sudden and complex peak discharge pressures, to 9 bar, separated by irregular pressure declines to 5 bar. Initial cycle periods of 42 minutes evolved to 150 minutes by day 20 of continuous testing, when three of four surge peaks were well s...

Increasing volumes of drilling lateral branches trunks, using the main also put forward need to solve a number new problems. Among them, there are small radial gaps between production string or liner and wall wellbore, which make it difficult ensure tightness annulus. The problem is exacerbated by fact that on an inclined horizontal section always eccentrically displaced relative axis well. The...

A numerical simulation of the effect evaluation heat loss and temperature distribution along wellbore is performed, for two models, first an open hole (without perforation) other a perforated vertical wellbore. In this study, Computational Fluid Dynamics (CFD) software code ANSYS FLUENT 15.0 has been used, simulate model 3-D turbulent flow with stander k-ϵ model. The results show that, increasi...