... Abstract The requirement for appropriate placement in matrix acidizing to achieve efficient, effective stimulation or removal of formation damage has long been recognized. Despite this, assessing the effectiveness of an acid treatment in terms of placement and treatment efficiency prior...

... where r (g·m −2 ·h −1 ) is the corrosion rate and m 1 (g) and m 2 (g) are the masses of a coupon before and after the immersion in acid. S (m 2 ) is the exposed surface area and t (h) is the immersion time (4 hrs in this study). The corrosion inhibition efficiency ( IE ) of steel can...

... Abstract Oil and gas companies operating carbonate oil and gas condensate fields in Kazakhstan have been carrying out acid stimulation activities leading to a substantial increase in hydrocarbon production. Nearly all treatments were considered a success. Nevertheless, a certain level...

... Abstract There are several methodologies to model post-acid fracturing well performance such as implementing negative skin factor and stimulated reservoir volume local grid refinement (SRV LGR). However, the first method is too simplified to be applied in numerical simulation and the second...

... Abstract Several extended reach-restricted completion-smart wells required matrix acid stimulation using Coiled Tubing (CT). These wells are equipped with Mechanical Formation Isolation Valve (MFIV) in the tubing end which needs to be reopened by using CT to access mother-bore for performing...

... of existing fractures that may have been initiated by response to regional stress fields whereas low energy techniques such as fracture acidizing may seek alkaline minerals that may also demonstrate greater potential for fracture failure. Combining these two attributes, stimulation thus includes...

.... Matrix stimulation has been proven to remove the fines blocking the pore throat. The desired solution has been carefully selected to have prolonged well production. Organic clay acid is chosen for to its ability to have deeper penetration and to create a thin coating on the pore surface to prevent fines...

... Abstract Treating deep hot carbonate reservoirs, such as those found in the Arabian Gulf, presents a series of complex and related challenges to achieve effective and uniform stimulation. Due to the elevated temperature and heterogeneous formation, achieving good reservoir contact with an acid...

... Abstract Fines migration is the common formation damage mechanism in the sandstone reservoir of field B which has less established information on mineralogy distribution. There were many attempts to remediate the formation damage using conventional mud acid fluid system but resulted in mixed...

... Inappropriate acidizing design not only consumes large amounts of acid, and fails to effectively remove the formation damage, but also leads to uneven inflow profile along horizontal lateral due to acid wormhole. This uneven liquid production profile may cause earlier water breakthrough...

... Abstract This study investigates the performance of viscoelastic surfactant (VES)-based HCl stimulation fluids as a function of carbonate rock type and quantifies the response of the acid to different pore-structures. A pore-structure evaluation during stimulation design could lead...

... Abstract While flowing in the fracture, acid may leak off through the wormholes and appear a finger-like pattern during the process of acid fracturing, which is commonly called "acid fingering". Acid fingering is an unsteady hydrodynamic phenomenon that happens when low viscous acid displaces...

... Abstract Matrix acidizing treatments are widely used for stimulating oil producing wells in the Zamrud field because of damage caused by scale plugging. The success of this matrix acidizing treatment depends on the uniform distribution of the treating fluid over the entire hydrocarbon-producing...

... Abstract Acid stimulation job is one of alternative technique used to improve well productivity. However, improper usage and design of this method may pose problems to the cements surrounding the perforation area of the well and it may lead to well integrity problems. Therefore a good...

... Abstract The energy global demand is predicted to increase by an estimated 2-4 percent annually over the next decade. However, production decline from mature field such as West Lutong is estimated about 5-6 percent annually. Therefore, acid stimulation provides a cost effective method...

... Abstract Lithologic character and physical property are greatly differential and distribute crisscross in vertical in zone Su131, Hai-la-er Oilfield. The same water injection well has two different acid sensitive reservoirs. The reservoir that is shallow and permeable is sensitive...

..., and the gas reserve is 1.42 trillion. Formations of the newly discovered carbonate oil/gas fields have the following features: deep buried (>5000m); serious heterogeneity; full of pores, caves and cracks; long well section. So, it's difficult for acid stimulation treatment. And the treatment effect using...

... enhancement strategy over the past 10 years comprising massive acid and proppant hydraulic fracturing treatments, high rate matrix acidizing and the drilling of maximum reservoir contact (MRC) horizontal producers. Some of the existing producers have recently began to experience significant productivity...

... Abstract Acid fracturing has been an integral part of Aramco's gas development strategy for the vertical wells in the Khuff carbonates over the last several years. The Khuff formation is a deep gas carbonate reservoir that is ideally suited for acid fracturing. During acid fracturing...

... This technology can communicate the wellbore and formation through combination of packer and sliding sleeve and realize sectional acidizing by dividing the whole horizontal perforation intervals into multi-sections. For long interval horizontal well acidizing, sectional acidizing with small...