Viscoelastic Surfactant Diversion: An Effective Way to Acidize Low-Temperature Wells

Ahmad, Toseef; Beaman, Daniel; Birou, Philippe

doi:10.2118/136574-ms

Cited by 9 publications

(3 citation statements)

References 9 publications

(8 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Further increasing the temperature cause the breakdown of network structure (Wei et al, 2016). Viscoelastic surfactants reflect better diversion at low temperature (Toseef et al, 2010). The mechanism of degradation of rod-like micelles at various temperatures is shown in Figure S2.…”

Section: Introductionmentioning

confidence: 99%

Application of erucyl dimethyl betaine sulfonate viscoelastic surfactant for optimization of acidizing operations in heterogeneous carbonate reservoirs

Safari

Sahraei

Khalilnezhad

2023

J Surfact & Detergents

View full text Add to dashboard Cite

Reservoir heterogeneity is an important factor which should be considered for each operation in oilfields. Acidizing operation is performed to eliminate or reduce the damages of reservoirs. The dissolution of the minerals and rock texture in damaged areas is the main goal of acidizing. However, the existence of high permeable zones through flowing paths results in extra damages and fluid loss. Some additives could be added to the injected acid to avoid these undesirable phenomena. In this research, we added a Zwitterionic sulfonate surfactant to hydrochloric acid (HCl) solution and evaluated the rheological behavior of several compositions of acid‐based viscoelastic surfactant (VES) solutions under various temperature and shear rates. The capability of optimum solution to plug the high permeable zone and divert the acid flow to low permeable zone is examined. The optimum solution was injected into a parallel sandpacked system with different permeabilities at various flow rates (1, 3 and 5 cc/min). It was observed that the injection rate of 3 cc/min has the most efficiency to reduce the heterogeneity. Besides the tendency of VES based solutions for altering wettability of rock to more water‐wet condition is observed. The findings of this study can help the better understanding of practical application of VES in acidizing through heterogeneous reservoirs. Besides, effective parameters for such application are determined.

show abstract

Section: Introductionmentioning

confidence: 99%

Application of erucyl dimethyl betaine sulfonate viscoelastic surfactant for optimization of acidizing operations in heterogeneous carbonate reservoirs

Safari

Sahraei

Khalilnezhad

2023

J Surfact & Detergents

View full text Add to dashboard Cite

show abstract

“…Over the past 10 years, many studies on the properties of acid systems employing viscoelastic surfactants have been published. − Laboratory studies of SDVA confirmed that using viscoelastic acid systems as acid diverters in the field is very efficient.…”

Section: Introductionmentioning

confidence: 99%

“…Other work presents the results of laboratory studies and field tests of VES applied to low-temperature wells (25 to 65 °C). The VES systems showed high acid diversion efficiency in low-temperature wells.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of a Viscoelastic Surfactant-Based in Situ Self-Diverting Acid System: Results and Interpretation

et al. 2013

View full text Add to dashboard Cite

Recently, self-diverting acid systems based on viscoelastic surfactants (SDVAs) have been successfully used for carbonate reservoir treatment. Changes in the SDVA viscosity during the interaction with carbonate reservoirs are associated with the transformation of spherical surfactant micelles into worm-shaped micelles as the acid concentration decreases and the fluid salinity increases. The highly viscous fluid acts as a temporary barrier and diverts the acid fluid into the untreated lower permeability zones. After treatment, the SDVA barrier breaks down when it makes contact with newly formed hydrocarbons. The objectives of this study were to examine in detail the viscoelastic surfactant effect on the HCl and calcite reaction and to examine the effects of the surfactant and acid concentrations on the SDVA apparent viscosity. Rheological measurements were conducted using rotational viscometers at 25 °C. A proposed semi-empirical rheological model describes the relationships between the apparent viscosity, rate, and HCl concentration. The core flooding tests were conducted in a specialized laboratory unit to simulate the downhole conditions. The testing unit allows for control of the pressure, temperature, and injected volume of acid flowing across the core sample. The results showed that the pressure drop varies as a function of the pumped fluid pore volume. The steady increase in the pressure as the fluid entered the core was a good indication of the actual viscosity increase in the porous rock during acid spending. The experiments were conducted using various flow rates. The core flow tests indicated that the SDVA surfactant delayed the acid breakthrough in carbonate cores. The mathematical model describing the results, obtained from the acidification experiments, is presented.

show abstract

Static and Dynamic Tests

Khamehchi,

Khaleghi,

Abbasi

et al. 2024

Applied Matrix Acidizing of Carbonate Reservoir

View full text Add to dashboard Cite

Viscoelastic Surfactant Diversion: An Effective Way to Acidize Low-Temperature Wells

Cited by 9 publications

References 9 publications

Application of erucyl dimethyl betaine sulfonate viscoelastic surfactant for optimization of acidizing operations in heterogeneous carbonate reservoirs

Application of erucyl dimethyl betaine sulfonate viscoelastic surfactant for optimization of acidizing operations in heterogeneous carbonate reservoirs

Experimental Study of a Viscoelastic Surfactant-Based in Situ Self-Diverting Acid System: Results and Interpretation

Static and Dynamic Tests

Contact Info

Product

Resources

About