It is not possible to directly measure the total mass of gas and liquid in the annulus and geological properties of the reservoir during petroleum exploration and production drilling. Therefore, these parameters and states must be estimated by online estimators with proper measurements. This paper describes a nonlinear Moving Horizon Observer to estimate the annular mass of gas and liquid, and ...

We use a recently developed high-resolution coherent probe spectroscopy method to investigate the dispersion of collective excitations polaritonic quantum fluid. measure relation with high energy and wavenumber resolution, which allows us determine speed sound in fluid evidence contribution an excitonic reservoir. report on generation at negative energies, ghost branch curve. Precursors dynamic...

Abstract Horizontal wells are often drilled and hydraulically fractured in tight reservoirs to produce hydrocarbons or heat. Different fracturing fluids such as slick water, gas, foam, gel, a combination can be used with water being the most common fluid. In this paper, we study impacts of different on well productivity using an in-house integrated hydraulic reservoir simulator equation-of-stat...

Abstract During polymer flooding into the reservoir using shear-thinning non-Newtonian fluids, an interface exists between in situ Newtonian crude oil and injected solution. This paper examines application of well test analysis techniques to develop analytical solution non-Newtonian/Newtonian fluids with different flow index composite reservoirs for estimating boundary conditions such reservoir...

Conventional reservoir drill-in fluids used for drilling reservoirs in Weizhou Oilfield encounter rheological problems that result technical such as hole-cleaning openhole horizontal intervals. Hence, novel fluid was developed by optimizing the additive quantity and particle size distribution. Lab tests showed boast high low shearing rate viscosity, provide promising cutting, carrying, suspensi...

Reinjection, which began at Larderello in 1974 as a means of disposing of excess steam condensate, is now envisaged as a method for improving heat recovery. The behavior of the geothermal field when subjected to production and injection is difficult to predict because of the very heterogeneous fractured reservoir. More information is needed on circulation patterns and heat sweeping processes to...

Mathematical models and numerical simulation tools will play an important role in evaluating the feasibility of CO2 storage in subsurface reservoirs, such as brine aquifers, producing or depleted oil and gas reservoirs, and coalbeds. We have proposed and initiated a code intercomparison study that aims to explore the capabilities of numerical simulators to accurately and reliably model the impo...