Petroleum Engineering – Reservoir
Seyed Reza Shadizadeh; Amin Derakhshan
Abstract
Oil recovery from oil wet carbonate rock is a big challenge in oil industry. In the present study, the influence of natural surfactant Hawthorn leaves extract (HLE) on oil recovery from carbonate rock is investigated. Two chemical surfactants include Sodium dodecyl sulfate (SDS) and Dodecyl tri methyl ...
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Oil recovery from oil wet carbonate rock is a big challenge in oil industry. In the present study, the influence of natural surfactant Hawthorn leaves extract (HLE) on oil recovery from carbonate rock is investigated. Two chemical surfactants include Sodium dodecyl sulfate (SDS) and Dodecyl tri methyl ammonium bromide (DTAB) were used for validation and comparison oil recovery with new natural surfactant HLE. Wettability alteration test using contact angle method, interfacial test (IFT) using pendant drop and core flooding were employed to investigate the behavior of the surfactants on oil recovery. Experimental results show the Critical Micellar Consentration (CMC) point of different concentrations of HLE, SDS and DTAB solution occurred at 3.25, 3 and 4.06 wt. %, respectively. The natural surfactant HLE was more effective than other chemical surfactant (SDS and DTAB) at CMC point in wettability alteration. As observed the contact angle of carbonate pellet and the HLE at CMC point was 86 degrees and this angle for SDS and DTAB were 112 and 92 degrees, respectively. Core flooding results show that oil recovery factor was improved from 37% with water flooding to 47.6 with SDS; 56.2% with DTAB and 54.7% with HLE. The results prove that; this new natural surfactant (HLE) can be used as a novel surfactant for chemical enhanced oil recovery process in carbonate oil reservoirs. HLE has beneficial effects in oil recovery because of its environment friendly compare to SDS and DTAB.
Mohammad Saki; Ali Reza Khaz'al
Abstract
The chemical surfactant flooding can mobilize the trapped oil by lowering the interfacial tension between oil and brine and in some cases altering the reservoir rock wettability. In this work, the effect of surfactants on oil/brine interfacial tension was experimentally investigated. First, the effect ...
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The chemical surfactant flooding can mobilize the trapped oil by lowering the interfacial tension between oil and brine and in some cases altering the reservoir rock wettability. In this work, the effect of surfactants on oil/brine interfacial tension was experimentally investigated. First, the effect of surfactants concentration was surveyed. Afterwards, the effect of salinity on surfactant behavior was studied. The experiments were carried out at ambient and reservoir temperatures (all at reservoir pressure) to clarify that we cannot generalize the ambient experimental results to reservoir ones and the experiments must be done in reservoir conditions to attain more certainty. Sodium dodecyl sulfonate, cetyl trimethyl ammonium bromide and Triton X-100 were used as the surfactants. The oil and brine samples of the Iranian Asmari reservoir were used. Pendant drop method was used to measure oil/brine interfacial tension. Based on the results, it is concluded that the anionic surfactant (SDS) has a better performance at reservoir and ambient temperatures. The superiority of SDS is more emphatic at reservoir temperature than ambient temperature. At reservoir temperature, the SDS solution lowers the interfacial tension significantly (0.4 mN/m) even when a very low concentration of SDS (0.04 wt.%) is added to brine.
