... for surveillance and follow up maintaining and optimizing injection and production. This paper shows the added value of using water or polymer injection selective valves for multilayer and heavy oil reservoirs to improve and stabilize production and injection rates, having also the option to monitor and record...

... stability case study reservoir Introduction Pay Zone Structure The A.G. Sandstone reservoir is divided into four sandstone formations. ( Fig.1 ). The first formation corresponds to a shaly sandstone. It is also composed of medium gray sandstones with very fine grain, surrounded with regular...

... point measurement of base oil before and after heat ageing to ensure that the base fluid were stable and the overall stability of the mud system need to be assured (rheology, gelation, fluid loss and weight material suspension) after both dynamic and static ageing for at least 96 hours at anticipated...

... and schedules to assure a good quality and stability of the preformed foam is also discussed. The CSS-foam injection pilot was performed in Teca - Cocorna field. The cumulative surfactant injection was between 3 to 5 tons distributed between two mature wells under CSS at a concentration of approximately 2500...

... reveals approximately 75% of CO 2 in the reservoir conditions and more than 95% of CO 2 in the surface conditions. Asphaltene stability was evaluated through four methods, including the Leontaritis method, colloidal stability index, Stankiewicz method, and stability crossplot (SCP), which enabled...

... and formation, analyzing subjects such as filtrate invasion profile, borehole stability, sand production, petrophysics and LWD FE. The ability to choose pad direction, coupled with high end technologies, such as NMR and resistivity images generate important capabilities to be evaluated considering formation...

... oil recovery methods. This is particularly true for reservoir conditions with high temperatures (above 85°C) using injection brine with high hardness. In such conditions, using specific robust polymers is necessary to ensure stability over months during propagation in reservoirs. These polymers...

... precipitation mechanism requires more clarity. This work investigates the effect of compositional changes on asphaltene stability. The impact of oil composition is explained by preparing pseudo-components by blending the crude oil with their own saturate fractions. A systematic characterization of 11 different...

... margin of the South America plate. Prominent disconformities between the Tiyuyacu Formation and overlying Orteguaza strata mark an important intrabasin structuring in Eocene or Oligocene time. ( Balkwill, H.R 1995 ). Wellbore Stability This section describes the main drilling characteristics...

... fluid selection and formulation operation drilling fluid property society of petroleum engineers anhydrite performance water base mud system hsi drilling fluid chemistry cleaning limpieza recomendacione upstream oil & gas perforación concentration stability orteguaza Introduction...

..., the pore pressure regime, and rock mechanical properties as uniaxial rock strength, internal friction or Poisson's ratio. The resulting 3D model provides a high resolution database that maps any lateral variation of the geomechanical attributes across the field and can be used to assess wellbore stability...

... of a need to achieve drilling stability and ultimately resulted in an enhancement on average ROP. This discovery, termed Powered Rotary Steerable System (RSS), combines, within the same BHA, a mud motor power section with a push-the-bit RSS tool. This system decouples surface RPM from downhole RPM allowing...

...; Patel, 2007 ; Al-Ansari, 2005 ). As noted above, the main results desired include: 1) shale stability, 2) clay inhibition, 3) cuttings stability, 4) high rate of penetration, 5) bit balling and accretion control, 6) torque and drag reduction, 7) high temperature and high pressure stability, 8) gas...

... design unique bi-center technology deliver Upstream Oil & Gas bit selection bi-center design Hole Angle mid-reamer section assembly directional performance bi-center bit Directional application motor assembly application intermediate section drilling operation cutter stability spe...

... Factors which contribute to foam stability are: Forming of a double layer of Gibbs. Electrical repulsion of surfaces charged by ionized groups of foam agent prevents thinning of film. Hydrogen bonds that water forms with different substances which bind all molecules of liquid...

... the injection point, which could generate a slugging condition affecting circulation stability and of course harmful Bottom Hole Pressure spikes. Fluid Selection Once the well profile was defined, the second step was to define the fluids to be used. Taking into consideration that the pore pressure is 0.4...

... and stabilization of the foam in the crude oil. The initial investigation was related to study a engine oil (Diesel)-air system which simulated the crude oil-gas system and the formation and stabilization variables, which affect the foam production. Finally the results were correlated with the crude oil-gas system...

... been successfully applied to drill in UDW scenarios, reactive clays, dispersive shale, naturally micro fractured formation and horizontal wells. HPWBM characteristics are developed with: 1) A new generation of encapsulation polymers; 2) The use of amine chemistry to provide clay stability; 3...

... They are: the presence of two inmiscible liquids, energy supply to the agitation, and presence of emulsifying agents 1 , 4 . Besides the aforementioned conditions to form emulsions, there are several factors that contribute to maintain their stability. Some of them are: crude type...

... attraction, hence working as a dispersant) and Suspending Agent (which provides slurry stability over the required storage life of the premix slurry). An Activator may be required depending on well-bore temperature and slurry requirements. The activator acts to re-initiate the hydration process, thereby...