Abstract
The aim of this research is to find the best suitable acid to acidize undamaged low permeable sandstone formation Stimulation of sandstone formations is a challenging task, which involves several chemicals and physical interactions of the acid with the formation. Mud acid has been successfully used to stimulate sandstone reservoirs for a number of years. Matrix acidizing may also be used to increase formation permeability in undamaged wells. The change may be up to 50 to 100% with the mud acid. For any acidizing process, the selection of acid (Formulation and Concentration) and the design (Pre-flush, Main Acid, After-flush) is very important. Different researchers are using different combinations of acids with different concentrations to get the best results for acidization. Mainly the common practice is combination of Hydrochloric Acid- Hydrofluoric with Concentration (3% HF-12% HCl). This study presents the results of a laboratory investigation of Orthophosphoric acid instead of hydrochloric acid in one combination and the second combination is Fluoboric and formic acid and the third one is formic and hydrofluoric acid. The results are compared with the mud acid and the results analyzed are porosity, permeability, strength, color change and FESEM Analysis. All of these new combinations shows that these have the potential to be used as acidizing acids on sandstone formations.
Highlights
IntroductionProductivity Improvement is the process of increasing production from oil or gas wells by removing flow restrictions that exists near the wellbore
The number of different acids are used in conventional acidizing treatments, the most common are: Hydrochloric, (HCl), Hydrofluoric, (HF), Acetic, (CH3COOH), Formic, (HCOOH).Typically, sandstone matrix stimulation involves three stages as explained by Zeit (2005): A pre flush stage to dissolve any carbonates that may be present and to displace the connate water from the rock. A mud acid treatment to dissolve siliceous and damaging material. An after flush to restore wettability and provide rapid formation cleanup.Productivity Improvement is the process of increasing production from oil or gas wells by removing flow restrictions that exists near the wellbore
For the purpose of acidizing, we have to do the saturation of the core sample for some time under vacuum conditions to speed up the process
Summary
Productivity Improvement is the process of increasing production from oil or gas wells by removing flow restrictions that exists near the wellbore.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Research Journal of Applied Sciences, Engineering and Technology
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
