We analyze the combined effects of aquifer heterogeneity and pumping operations on seawater intrusion (SWI) in coastal aquifers, a phenomenon which is threatening Mediterranean and worldwide regions. We conceptualize the aquifer as a three-dimensional randomly heterogeneous porous medium, where the spatial distribution of permeability is uncertain. The geological setting of our study is pattern...

Aquifer information carried by aquifer test data may be affected by the presence of a finite thickness skin around the wellbore. The mathematical treatment for an aquifer accounting for the skin zone can be characterized by five parameters, that is, the outer radius of the skin zone and the transmissivity and storativity for each of the skin and aquifer zones. Sensitivity analysis was performed...

The most prominent aspect of multiphase flow is the variation in the physical distribution of the phases in the flow conduit known as the flow pattern. Several different flow patterns can exist under different flow conditions which have significant effects on liquid holdup, pressure gradient and heat transfer. Gas-liquid two-phase flow in an annulus can be found in a variety of practical situat...

This paper analyzed the characteristics of managed pressure drilling (MPD) technology and impact of wellhead back pressure on the wellbore annulus pressure profile, and found that the application of this technology provides room for improvement to the current casing program design. Meanwhile, the equivalent density of drilling fluid in wellbore annulus needs to consider the impact of back press...

A transient fully coupled model is proposed to investigate the two-phase flow of CO2 and water-based fluid in a wellbore, considering complex mass heat transfer different patterns dynamic coupling between wellbore reservoir. Based on conservation, momentum, energy balance, employs state-of-the-art equation state transport models analyze variations multiphase behaviors properties wellbore. Appli...

Drilling a hole into rock results in stress concentration and redistribution close to the hole. When induced stresses exceed strength, wellbore breakouts will happen. Research on breakout is fundamental of stability. A sequence concentrations, falling, redistributions, which involve initiation, propagation, stabilization sequences. Therefore, simulating process very challenging. Thermoporoelast...

The use of fiber optics within geothermal wells has been extremely limited. The high-temperatures and formation of molecular hydrogen within the well have resulted in the early death of fiber optic cables. This paper reveals reasons for hope to extend the life of fibers for many years. Various fibers have been evaluated for degradation when exposed to ambient molecular hydrogen. Two commerciall...

Conventional design method of the downhole tractor is based on cementing casing, which only suitable for smooth wellbore. For open hole well, conventional has poor adaptability and even cannot work normally. In order to improve obstacle surmounting performance wheeled (WDR) expand application range WDR, a double push rod-double spring support adjustment mechanism (DPRDSSAM) proposed in this pap...

The porochemoelectroelastic analytical models and solutions have been used to describe the response of chemically active and electrically charged saturated porous media such as clays, shales, and biological tissues. However, these attempts have been restricted to one-dimensional consolidation problems, which are very limited in practice and not general enough to serve as benchmark solutions for...

Significant stress changes caused by sorption-induced swelling raise the coal wellbore failure potential, which directly impacts safety and sustainability of CO2 enhanced coalbed methane (CO2-ECBM). Additionally, a mixture gas (CO2/N2) injection is recommended due to sharp decline permeability with pure injection. In this study, incorporating adsorption poroelastic effects, semi-analytical mode...