Assessment of oil-producing wells by means of stimulation approach through matrix acidizing: a case study in the Azraq region

Abstract

The acidizing approach belongs to the well workover operations, where acid mixtures are initially implemented to treat damage near the wellbore area after drilling operations have been completed. Acidizing treatment is characterized by removal of fine particles and debris from the porous media of the damaged zone, hence leading to improve oil production from wells. This study evaluates the assessment of the acidizing treatment in vertical oil-producing wells. Gradually, the damage formation was reduced and then eliminated, and to a great extent, was compensated with the better performance of oil production from reservoirs. Target candidate wells were enriched by environmentally friendly additives and special chemicals, in predefined amounts, to achieve enhanced oil production rates from wells. A semi-analytical model was formulated for extrapolating the skin magnitude, depending on the damage formation’s permeability parameter as well as on the physical characteristics and reservoir depth. The figures of skin magnitude for all target wells were decreased, and oil production rates were enhanced after performing the matrix acidizing process. These findings are valid for diverse geological settings of different formations, as all treated intervals within the investigated wells have shown an objective response to the matrix acidizing approach. Eventually, productivity rates are imperative to increase potential economic outcomes.

Influence of Matrix-Acidizing Design on Oil Recovery and Economics in Carbonate Reservoirs Undergoing Waterflooding Offshore in Brazil

“…Al-Mahasneh et al (2021) [25] evaluate the efficacy for acidizing treatments in vertical oil-producing wells, particularly through a case study conducted in the Azraq region. The study highlights the successful application of well stimulation techniques in assessing oil-producing reservoirs, as demonstrated by a reduction in the skin magnitude.…”

“…A key observation made by the authors is that incorporating the reservoir's physical parameters can substantially reduce uncertainties. This suggests not only that the effectiveness of acidizing treatments is influenced by the characteristics of the reservoir but also that the acidized wells' effectiveness can vary, depending on the specific characteristics of each reservoir [25]. Bedrikovetsky et al (2009) [26] investigate the use of untreated water in horizontal wells for waterflooding, focusing on the North Sea, Gulf of Mexico, and Campos Basin.…”

Research on high efficiency and retarded autogenous mud acid for plugging removal in a sandstone reservoir—Example of Bai 823 well area

“…With the continuous progress of science and technology, new types of acids such as fluoroboric acid, slow-rate mud acid, and autogenous mud acid have gradually emerged. 9,10 Sandstone matrix acidizing has been widely used in the field since the 1960s. The complex mineral composition of sandstone reservoirs, coupled with the complex pore structure in the formation, has caused the complexity of the acid rock reaction process in sandstone reservoirs.…”

“…However, during the process, the problems caused by mud acids were gradually exposed, including fast reaction rate, shallow depth of penetration into the formation, and secondary contamination of the reservoir due to the transport of the particles produced by acidification. With the continuous progress of science and technology, new types of acids such as fluoroboric acid, slow‐rate mud acid, and autogenous mud acid have gradually emerged 9,10 …”