Status of Alkaline-surfactant Flooding

Sheng, James J.

doi:10.4172/2471-9935.100006

Cited by 9 publications

(14 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The median of alkalis was 16.2 (product of PV in % and concentration in %). This amount is very close to that for surveyed alkaline flooding projects alone (Sheng 2015).…”

Section: Summary Of Ap Field Projectssupporting

confidence: 78%

“…Although alkaline reaction with crude oil generates surfactants in situ, field performance shows that the incremental oil recovery factors from most of alkaline projects were 1-2 % with a few projects having 5-6 % (Mayer et al 1983;Sheng 2015). Polymer flooding provides the necessary mobility control for alkaline flooding, but it cannot reduce residual oil saturation because the capillary number cannot be significantly increased by high polymer viscosity in practice.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Critical review of alkaline-polymer flooding

Sheng

2016

J Petrol Explor Prod Technol

View full text Add to dashboard Cite

Field performance shows that the incremental oil recovery factor from alkaline projects was low. Chemical EOR experience tells us that the mobility control is very important. Thus, the combination of alkaline flooding and polymer flooding is expected to improve alkaline flooding performance. This paper is to provide a critical review of alkaline-polymer (AP) flooding. The following subjects are covered. • Interaction of alkali-polymer • Technical screening criteria • Laboratory and simulation work • Summary of field projects • Further discussion The data and analysis presented in this paper will give readers updated information about alkaline-polymer flooding. This paper suggests the AP synergy need to be further studied with more experimental measurement, theoretical analysis and numerical simulation study.

show abstract

“…The median of alkalis was 16.2 (product of PV in % and concentration in %). This amount is very close to that for surveyed alkaline flooding projects alone (Sheng 2015).…”

Section: Summary Of Ap Field Projectssupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Critical review of alkaline-polymer flooding

Sheng

2016

J Petrol Explor Prod Technol

View full text Add to dashboard Cite

show abstract

“…The function of surfactant is to reduce oil‐microemulsion IFT from the initially 20 mN/m (oil–water) to about 10 −3 mN/m. These results show that the alkali outperforms the surfactant, which is generally not the case, as alkali cannot perform so well . Because the wettability alteration can be achieved by alkali injection or surfactant injection, these results indicate that wettability alteration could be more important than IFT reduction.…”

Section: Resultsmentioning

confidence: 94%

Performance analysis of chemical flooding in fractured shale and tight reservoirs

Sheng

2017

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

To enhance the oil recovery in fractured shale and tight oil reservoirs, many efforts have been made to add surfactants in injection water and fracturing fluid. Most of the efforts were to conduct experiments to screen surfactants.To the best of our knowledge, there is no paper to provide numerical analysis of the surfactant performance in fractured shale and tight reservoirs. In particular, how the fracture network affects chemical flooding performance has not been addressed. This paper is to use numerical simulation approach to analyze the performance of chemical additives (alkali and surfactant) in fractured shale and tight rocks. The base simulation model is based on history-matching an experiment. The effects of wettability alteration, interfacial tension (IFT), capillary pressure, and pressure gradients are investigated. To aid our understanding and interpret the results, the results from high-permeability models are compared with shale and tight models. We found that if the rock is oilwet, it is very slow for a chemical to diffuse into the shale or tight matrix to alter wettability, so the oil recovery is not very sensitive to the value of capillary pressure. In shale and tight reservoirs, using surfactants to achieve ultralow IFT may not be effective, because the surfactant solution with ultra-low IFT cannot enter the matrix and will break though producers, and oil in the matrix will be bypassed. And increasing the pressure gradient may not be effective because a high-pressure gradient will aid breakthrough, instead of enhancing injected fluid invasion into the matrix.

show abstract

“…However, during the passage through the porous media, the polymeric molecules are attracted by the rock surface as a result of physical and chemical interactions between the components [2,4,[6][7][8][9]12,16,20,22,28,34]. This phenomenon, known as adsorption, decreases polymer concentration in the injected solution and, therefore, the efficiency of the process is seriously affected.…”

Section: Introductionmentioning

confidence: 99%

Polymer adsorption isotherms with NaCl and CaCl2 on kaolinite substrates

Vertel

Vargas

Díaz

et al. 2019

DYNA

View full text Add to dashboard Cite

During polymer – flooding, polymer’s molecules are attached to the surface of the rock as a result of many interactions between both components, leading to a decrease on the injected slug’s concentration. This phenomenon, known as adsorption, depends on rock type, degree of hydrolysis and polymer concentration, reservoir’s temperature, water salinity, among others, and might be predicted by analytical models. This work shows the results of a series of static tests in which water’s salinity (NaCl and CaCl2) and polymer’s concentration were varied, to determine which of the analytical models can predict in a better way the experimental data when kaolinite substrates are used. It is discussed the abnormal trend of the adsorption, where higher NaCl concentrations resulted in lower adsorption results, basically because of a flocculation.

show abstract

Status of Alkaline-surfactant Flooding

Cited by 9 publications

References 39 publications

Critical review of alkaline-polymer flooding

Critical review of alkaline-polymer flooding

Performance analysis of chemical flooding in fractured shale and tight reservoirs

Polymer adsorption isotherms with NaCl and CaCl2 on kaolinite substrates

Contact Info

Product

Resources

About