... Abstract The oil and gas industry continue to rely on chemical methods for well stimulation of carbonate-rich formations, particularly hydrochloric acid (HCl). The selection is primarily driven by the fact that it is cost-effective and readily reacts with calcium and magnesium-based carbonates...

..., certain hot wells have shown a shorter plateau period and encountered a rapid decline in production, possibly indicating formation damage. This paper provides an explanation of the evaluation process for scale problems and proposes an acidizing solution to mitigate the issue. The team performed...

.... Although this technique had positive impact on overall field production, but it was observed uneven flow through wellbore. An approach using Plug and Perforation technique was implemented successfully to reduce dissipate of fracturing energy during pumping and improve acid propagation. Multi-stage...

... Abstract HCl based stimulation fluids occupy the dominant space in matrix acidizing of limestone reservoirs. To initiate wormhole propagation at high temperature/low injection rates and provide deeper penetration, the reactivity of HCl is generally retarded by emulsifying it with an external...

... Abstract Acid fracturing is an essential technology for the efficient development of oil and gas reservoirs containing carbonate. However, in the case of deep and ultra-deep marine carbonate oil and gas reservoirs, existing acid fracturing technologies are unable to create a complex fracture...

.... The rate was increased temporary with Water Cut (WC) remained at the same level. The subseqeuent effort was to inject low reaction chelating acid and the result showed temporary improvement and the production did achieve significant gain. Finally, the third attempt indicated promising results...

... Abstract Organic acid has been widely applied for inorganic scale treatment in oil and gas industry including well stimulation and scale inhibitor. Thanks to its low corrosivity and slower reaction rate with rock, organic acid is considered to offer better performance comparing to strong acid...

... Abstract One of Sudanese fields has a heavy crude oil which has a high Total Acid Number (TAN) and high viscosity, can cause a lot of problems in production operation, transport, and storage facilities. The effect of ethanol dilution on the rheological properties of crude (especially...

... 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...

.... This paper describes a case history demonstrating how a differentially stuck string was freed in a relatively short time using an innovative enzyme/weak acid recipe. The string was a 4-1/2 in. lower completions bottom hole assembly (BHA) comprising of swell packers, and inflow control devices. The string...

..., and untapped potential from these reservoirs. Before the sand control technique was applied, an organic acid blend was introduced to help significantly reduce NWB damage. Particular attention was given to minimizing the destabilization of these high-clay-content formations. An ultralow molecular weight...

... and not as easily removed as with a conventional solvent or acid soaking job; thus preventing wireline entry for production surveillance and enhancement activities. Several mechanical, chemical and even combination techniques have been deployed with varied levels of success at Field P, which produces waxy crude...

... Abstract Acid Fracturing technique is an alternative to propped fracturing in acid soluble formations. Factors controlling the effectiveness of acid fracturing are the etched fracture penetration and conductivity. Large volumes of acid and the dissolution of large volumes from thefracture faces...

... 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 Recently, different stimulation techniques, including diverting acid fracturing, proppant fracturing and non-acid stimulation, were tested in Keshen 8 gas reservoir in Kuqa Gasfield of Tarim Oilfield. By comparing the production after stimulation, it is found that acid fracturing...

... Geopolymer that was previously having the lowest strength almost maintained the same strength value and lost only about 1.7% strength. This phenomenon is because of the hydrochloric and hydrofluoric acid reacted with the calcium hydroxide which is the required element in Class G cement to form...

... Abstract This paper highlights the challenges and limitations encountered, and the respective solutions executed, during an acid stimulation campaign, conducted on multiple offshore power water injector (PWI) and oil producers (OP). The field development concept for the field in includes...

... Abstract The naturally fractured carbonate reservoir of Ta-zhong has been developed for over ten years due to new technologies. Since 2008, a program was undertaken to test openhole multistage acid-fracturing technology in the Ta-zhong gasfield to determine if deep fractured carbonate reservoir...

... various produced fluids during different activities such as mudcake clean-out, completion, or well stimulation treatments. This study includes also a detailed investigation of emulsion and scaling potential of various produced fluids mixtures: oil/clean-out fluid, oil/spent acid, spent acid/formation...

... Abstract A new Acid-Alkali-Polymeric Surfactant (AAPS) flooding formulation has been developed to overcome the precipitation problems caused by the divalent metal cations prevalent with conventional ASP flooding. The acid was evaluated in an acid- alkali-surfactant formulation using sodium...