A review of oilfield scale management technology for oil and gas production

Model study on the kinetics of oil field formation damage due to salt precipitation from injection

Uncoupling between the flow field and the stress field in pumped aquifers is the basis of the classical groundwater hydrology. Recently, some authors have disputed the assumption of uncoupling with regard to both fluid dynamics and porous medium deformation. The issue is very important as it could undermine the traditional approach to simulate subsurface flow, analyze pumping tests, and predict land subsidence caused by fluid withdrawal. The present paper addresses the problem of coupling versus uncoupling in the Po river plain, a normally consolidated and normally pressurized basin which has experienced in the last 50 years a pronounced pore pressure drawdown because of water and gas removal and where a large hydromechanical database is available from the ground surface down to 4000 m depth. A numerical study is performed which shows that the matrix which relates flow to stress is very similar to the capacity matrix of the uncoupled flow equation. A comparison of results obtained with the finite element integration of the coupled and uncoupled models indicates that pore pressure is rather insensitive to coupling anywhere within the pumped formation while in the adjacent aquitard-aquifer units, coupling induces a slight overpressure which quickly dissipates in time with a small initial influence on medium deformation, and specifically on land subsidence. As a major consequence the uncoupled solutions to the fluid dynamic and the structural problems appear to be fully warranted on any timescale of practical interest in a typical normally consolidated and pressurized basin.

https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2000WR900127

Importance of poroelastic coupling in dynamically active aquifers of the Po river basin, Italy

Progress in the development of sour corrosion inhibitors: Past, present, and future perspectives

Laboratory and prediction of barium sulfate scaling at high-barium formation water

A newly developed model to predict chemical compatibilities in waterflood operations is described. The model calculates the coprecipitation of BaSO/sub 4/, SrSO/sub 4/, and CaSO/sub 4/ at various locations in field operations as mixtures of injection and reservoir waters flow through injection wells, reservoir, and production wells into surface facilities. As its data base, the model uses comprehensive data of actually measured solubilities in fairly complex oilfield and geothermal brines at various temperatures and at saturation or atmospheric pressure. The solubilities at high pressures are calculated using thermodynamic parameters. The application of the model is illustrated by examples involving two reservoir and two injection waters. 19 refs.

Prediction of Scale Problems Due to Injection of Incompatible Waters

Long overlooked residual oil zones (ROZ's) are brought to the limelight

An experimental method has been developed to obtain the Biot elastic constant of rocks from laboratory acoustic measurements. To date, the Biot elastic constant has never been determined experimentally. It has always been calculated using various empirical equations. The experimental determination of the Biot elastic constant is very important to engineering problems associated with sand control, hydraulic fracturing, wellbore stability, earth stresses. sonic porosity and estimation of compressional (P) and shear (S) wave velocity. Both the dynamic and static moduli of actual reservoir sandstone core samples. jacketed and mounted in a triaxial cell under high vacuum (< 0.15 mbar), were measured at various confining and overburden pressures. The vacuum was obtained in-situ and maintained till the end of the experiment. This vacuum-dry rock condition represents the dry skeletal frame of the rock. The bulk modulus of the dry skeletal frame of the rock (K sk ) was calculated using the measured P- and S-wave velocities of the vacuum-dry rock. The rock matrix bulk modulus (K s ) was estimated by averaging the harmonic and arithmetic means of the constituent pure mineral moduli. The results obtained show that the Biot elastic constant is a complex function of porosity, permeability, clay content. pore-size distribution and overburden and confining pressure. The experimentally determined Biot constant values may be significantly different from those calculated using empirical equations. This experimental method suggests a new approach to quantifying the Biot elastic constant in the laboratory. This approach gave a better estimate of rock strength, earth stresses. sanding predictions, P- and S- wave velocities, porosity, and pore-fluid from sonic and seismic data.

Experimental Determination of the Biot Elastic Constant: Applications in Formation Evaluation (Sonic Porosity, Rock Strength, Earth Stresses, and Sanding Predictions)

Experimental determination of the biot elastic constant: applications in formation evaluation (sonic porosity, rock strength, earth stresses and sanding predictions)

Abdallah Harouaka

Papers

Prediction of Scale Problems Due to Injection of Incompatible Waters

Long overlooked residual oil zones (ROZ's) are brought to the limelight

Experimental Determination of the Biot Elastic Constant: Applications in Formation Evaluation (Sonic Porosity, Rock Strength, Earth Stresses, and Sanding Predictions)

Experimental determination of the biot elastic constant: applications in formation evaluation (sonic porosity, rock strength, earth stresses and sanding predictions)

Characterization of Tar From a Carbonate Reservoir in Saudi Arabia: Part I-Chemical Aspect