Investigation of the Nonionic Acidizing Retarder AAO for Reservoir Stimulation
Zhonghao Chen1,2, Hongping Quan1,2, Zhiyu Huang1,2
1College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China.
ACS Omega
|October 30, 2023
Summary
A new nonionic acidizing retarder, AAO, was synthesized to slow hydrochloric acid reactions with carbonate rocks. AAO forms a protective film, significantly extending the effective acidizing time and reducing reservoir damage.
Area of Science:
- Petroleum Engineering
- Materials Science
- Physical Chemistry
Background:
- Matrix acidizing is crucial for oil and gas reservoir stimulation.
- Controlling the acid-rock reaction rate is a major challenge in matrix acidizing.
- Adsorption films can mitigate rapid acid-rock interactions.
Purpose of the Study:
- To synthesize and characterize a novel nonionic acidizing retarder (AAO).
- To evaluate the performance of AAO in retarding the reaction between hydrochloric acid and carbonate rocks.
- To investigate the adsorption mechanism and film-forming properties of AAO on carbonate surfaces.
Main Methods:
- Synthesis of AAO using acrylamide, allyl poly(ethylene glycol), and octadecyl methacrylate.
- Characterization of AAO structure using FT-IR and 1H NMR.
- Evaluation of acid-rock reaction kinetics by measuring CO2 generation at 50 °C.
- Adsorption studies on CaCO3, kinetic modeling, and XPS analysis.
- SEM imaging to observe film formation and hydrolysis analysis.
Main Results:
- AAO significantly extended the CaCO3 etching time from 45 min to 120 min compared to hydrochloric acid alone.
- AAO adsorption on CaCO3 followed a pseudo-second-order kinetic model, driven by hydrogen bonding.
- XPS confirmed the presence of nitrogen on the CaCO3 surface after AAO adsorption.
- SEM revealed a smooth, dense film formed by AAO on the CaCO3 surface.
- Hydrolysis of ester groups in AAO facilitated film desorption and reduced reservoir damage.
Conclusions:
- The synthesized nonionic acidizing retarder AAO effectively delays acid-rock reactions in carbonate reservoirs.
- AAO forms a protective film on the carbonate surface, mitigating damage and improving stimulation efficiency.
- The adsorption mechanism and film properties suggest AAO's potential for enhanced oil and gas recovery.
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