Abstract
In upstream oil industry, microorganisms arise some opportunities and challenges. They can increase oil recovery through microbial enhanced oil recovery (MEOR) mechanisms, or they can increase production costs and risks through reservoir souring process due to H2S gas production. MEOR is mostly known by bioproducts such as biosurfactant or processes such as bioclogging or biodegradation. On the other hand, when it comes to treatment of reservoir souring, the only objective is to inhibit reservoir souring. These perceptions are mainly because decision makers are not aware of the effect microorganisms’ cell can individually have on the wettability. In this work, we study the individual effect of different microorganisms’ cells on the wettability of oil-wet calcite and dolomite surfaces. Moreover, we study the effect of two different biosurfactants (surfactin and rhamnolipid) in two different salinities. We show that hydrophobe microorganisms can change the wettability of calcite and dolomite oil-wet surfaces toward water-wet and neutral-wet states, respectively. In the case of biosurfactant, we illustrate that the ability of a biosurfactant to change the wettability depends on salinity and its hydrophilic–hydrophobic balance (HLB). In distilled water, surfactin (high HLB) can change the wettability to a strongly water-wet state, while rhamnolipid only changes the wettability to a neutral-wet state (low HLB). In the seawater, surfactin is not able to change the wettability, while rhamnolipid changes the wettability to a strongly water-wet state. These results help reservoir managers who deal with fractured carbonate reservoirs to design a more effective MEOR plan and/or reservoir souring treatment strategy.
Highlights
Hydrocarbon reservoirs as a major part of the deep subsurface biosphere host indigenous microorganisms that live under harsh pressure and temperature conditions
In order to increase the recovery from these reservoirs, different research works have suggested different methods such as surfactant injection and smart water injection to change the wettability of carbonate surfaces, and stimulate imbibition process (Austad et al 1998; Strand et al 2006)
We suggest the difference between wettability alteration for MJ03 and PTCC 1318 compared to that of MJ01, MJ02 and MJ04 is due to the different hydrophobicity of these strains
Summary
Hydrocarbon reservoirs as a major part of the deep subsurface biosphere host indigenous microorganisms that live under harsh pressure and temperature conditions. These diffusion-driven environments have been isolated and stabilized Carbonate reservoirs are often fractured with a relatively low matrix permeability, and on top of that, they are in most of the cases neutral-wet or oil-wet. Water flooding recovery from carbonate reservoirs is generally low (Strand et al 2006). In order to increase the recovery from these reservoirs, different research works have suggested different methods such as surfactant injection and smart water injection to change the wettability of carbonate surfaces, and stimulate imbibition process (Austad et al 1998; Strand et al 2006)
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