... 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...

... 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 including...

... 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...

... 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...

...Model Assumptions There is only aqueous phase in the open fracture. The aqueous phase fluid is incompressible New-tonian fluid. The fluid density is constant and independent of concentrations of acid and polymer. Gravity is not considered. The fluid flow in the fracture is laminar...

... 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 of wettability of rock), high thermal stability (150 °C), predictable rheology (Herschel...

... formations contain fractions of feldspars and carbonates as cementing material. Generally, the objective of the acid treatment to an oil-bearing formation is to enhance its productivity by two main mechanisms; (1) is to dissolve the rock minerals and create additional flow channels within the reservoir or (2...

... on the effects of evolved CO 2 due to carbonate mineral dissolution, and its ensuing activity, during the preflush phase in matrix acidizing of sandstone reservoirs. Sandstone acidizing in the presence of different rock saturations conditions is seldom investigated. The presence of oil during preflush may...

... Abstract Acid-tunneling is an acid jetting method for stimulating carbonate reservoirs. Several case histories from around the world were presented in the past showing optimistic post-stimulation production increases in open-hole wells, comparing to conventional coiled tubing (CT) acid jetting...

... This paper introduces new VES-based acid systems for acid divergent applications. Rheology measurements were conducted for initial screening. The passed VES-acid system was then studied at different temperature and corrosion inhibitor concentrations. Experimental Studies Materials...

... Abstract A comprehensive study on wormholing has been conducted to improve the understanding of matrix acidizing in carbonate reservoirs. This work is a continuation of previous work ( Furui et al. 2012a , 2012b ). An analysis of additional experimental results as well as field measurements...

... Abstract Foam diversion has industry recognition as a proven approach to diversion in remedial 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...

... 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...

... Abstract A new in-situ generated HCl acid was developed to overcome the fast reaction rate and high corrosion rates of 15 wt% regular HCl acidizing system. The objectives of this work are to: (1) examine the reaction rate of the new in-situ generated HCl with calcite at 100, 150, and 200...

... The current practice of wormhole optimization is to create a wormhole efficiency curve from lab core flooding experiments that plots pore volume to breakthrough versus interstitial velocity of acid. In laboratory tests, wormholes are created in linear cores. Pore volume to breakthrough ( PV bt...

... The flow of a Newtonian acid through a porous medium can be described by Darcy's law as follows ( Eq.1 ): (1) U = − 1 μ K . ∇ P , where P is the pressure, K is the permeability tensor; μ is the viscosity of the acid and U = ( U, V, W ) is the Darcy velocity...

... 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...

... The dissolution pattern during matrix stimulation affects the skin evolution because this pattern determines the depth of penetration of the acid into the rock. When dominant wormhole patterns are formed, the acid penetrates deepest into the formation, which leads to the highest reduction in skin...

... The goal of acid-stimulation treatments is to remove or bypass formation damage from the near-wellbore region and increase the communication between the reservoir and the wellbore. The success of matrix treatments depends on uniform distribution of the treating fluids over the entire production...

... 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...