... occurring, green, non-toxic corrosion inhibitor can be developed from these fruits and can comfortably pass the industry requirement of achieving corrosion rates below 0.05 lb/ft 2 for low carbon steel tubulars. Corrosion during acid treatments causes destruction to the tubulars and downhole equipment...

... by the technology oil-gas producing wells. A duration of positive effect reached 14 months on average for ten treated wells, which is four times higher than a classical acidizing technology applied on the same formations. The main competitive advantages of the technology are enlarged surface charge (alteration...

... Abstract Hydrocarbon production enhancement by means of acid stimulation in Kazakhstan requires application of a more effective approach to address challenges associated with acid placement and reservoir contact in long pay zones of high-temperature carbonate reservoirs, thereby improving...

...Introduction More than 60% of the world's oil reserves and 40% of the world's gas reserves are located in carbonate reservoirs [1] . Acid stimulation is used extensively to enhance the production of oil and gas in carbonate reservoirs. There are two categories of carbonate acid stimulation...

... Abstract This paper presents the first application of metal expandable frac packers for multistage acid fracturing (MSF) completions. This technology significantly reduces deployment risk commonly associated with openhole (OH) MSF completions with the ability to rotate while running in hole...

...Introduction Abstract In carbonate matrix acidizing, the critical design parameters are interstitial velocity and pore volume to breakthrough for wormhole propagation at the optimal condition (v i,opt and PV BT,opt ). These two parameters are determined by the formation rock properties...

... Injecting the in-situ generating acid fluids inside the cores for 3 successive cycles led to dissolve the rock minerals. This, in return, resulted in an enhancement in the connectivity of the pores reflected by an increase in the sample permeability. The final permeability measurement was carried...

... In order to obtain the acid reaction rates at 46 and 97F (i.e., the temperatures from the eight acid tests described above), the laboratory acid reaction rates at 68, 122, and 176F were interpolated for 97F and extrapolated for 46F. Those two curves are also shown in Fig. 13 . The acid reaction...

... ). While most of the sandstone acidizing experiments at a laboratory scale focus on improving rock permeability by dissolving the clays and feldspars minerals, very little work has been done to quantify and study the effect of CO 2 liberated during the preflush. Although the success rate of sandstone...

... In a similar manner, Hawkins’ formula ( Hawkins 1956 ) can be used to estimate the effective acid stimulation radius from the measured skin data: (3) S post-acid = [ k / k post-acid − 1 ] ∗ ln ( r wa / r w ) where k is the reservoir...

... Abstract Viscoelastic surfactants (VES) have been introduced as acid divergent agents for easier cleaning and mixing advantage over in-situ gelled acid systems. Thermal stability and compatibility with the other additives, such as corrosion inhibitors, are the main problems with conventional...

... of the wormholing phenomenon which requires further development of more accurate 3D multiphase/multiphysics models. This challenge is the principal motive for this work. The objective of this paper is to model carbonate acidizing more accurately from a geochemical point of view. All previous numerical models...

... of HCl increase with increasing temperature. The reaction rate of HCl also increases with increasing rotational speed in the mass transfer limited regime. C b : bulk concentration of acid, moles/cm 3 C s : surface concentration of acid, moles/cm 3 D : diffusion coefficient of HCl, cm 2 /s...

... sandstone acidizing in deep-water environments. With long intervals and large displacement volumes it is critical that a stable diverter reach the perforations with sufficient viscosity to sustain diversion effectiveness. Industry publications and laboratory testing indicate that non-stabilized foam systems...

... Abstract An accurate description of reactive transport phenomenon in porous media has major applications for many processes such as, contamination in groundwater resources, carbon capture and storage, enhanced oil recovery, and acid stimulation. These processes, involve surface reaction coupled...

... Modeling & Simulation complex reservoir Upstream Oil & Gas Artificial Intelligence acidizing reaction kinetic porosity Injection Rate equation flow in porous media carbonate reservoir heterogeneity wormhole reach breakthrough optimum injection rate Fluid Dynamics regime...

... Abstract Carbonate acidizing restores and enhances production by dissolving a fraction of the rock to create highly conductive channels or wormholes. Most experimental acidizing studies are focused on acid injection at Constant Volumetric Rate (CVR) rather than at Constant Injection Pressure...

... Abstract Carbonate rocks have complex heterogeneities that result from syn- and post-depositional stressors. These heterogeneities invariably affect the movement of fluid through the formation. When considering an acid treatment procedure, care must be taken to optimize the acid concentration...

... Abstract The complex pore structure and porosity in carbonate rocks have a strong influence on the stimulation efficiency of the acid. Recently, it was shown that nondestructive tracers can be used to predict pore volume of acid to breakthrough (PVBT) for both plain and emulsified acids [ 1...

... Abstract Acidizing of carbonate reservoirs is a common technique used to restore and enhance production by dissolving a small fraction of the rock to create highly conductive channels. Literature review reveals that most acidizing studies are focused on acid injection at a constant volumetric...