We present a mathematical model for wettability alteration wa in fractured reservoirs. In the petroleum context, wettability is the tendency of a reservoir rock surface to preferentially contact a particular fluid in a multiphase or twophase fluid system 3. Wettability alteration with several anionic surfactants and sodium carbonate was examined by seethepalli et al. N2 compositional changes amongst surface active components of petroleum are brought about by crude oilbrinerock interactions. Jamiu oyekan adegbite, emad walid alshalabi, bisweswar ghosh.
In the wateroilrock system, wettability is manifested as the expansion trend of oil or water to rock surface. Pdf enhancing hydrocarbon productivity via wettability alteration. This alteration was measured based on the contact angles of different surfactant solutions on oiltreated glass chips. Request pdf wettability alteration in petroleum systems.
Similarly, because of wettability alteration with fc722, there is no imbibition of either oil or water in both berea and chalk. Chemical agents are used as wettability modifiers in carbonate systems. Fc722 has a more pronounced effect on the wettability alteration to preferential gaswetting. Similarly, because of wettability alteration with fc722, there is no imbibition of either oil or water in both berea and chalk samples. Wettability is the ability of a liquid to maintain contact with a solid surface in a threephase system. A moneymaker forum panel discussion talk given by salem thyne, esal in oklahoma city, oklahoma on 4 april, 2019. Understanding formation wettability is crucial for optimizing oil recovery. The wetting phase will tend to spread on the solid surface and a porous solid will tend to imbibe the wetting phase, in both cases displacing the nonwetting phase.
Wettability alteration used for water block prevention. Primary evaluation indicated that incorporating dlvo terms. Although the number of oilwet and waterwet reservoirs. In a rockoilbrine system, many wetting states are thought to occur. Jul 01, 2004 hence, petroleum surface active compounds are capable of rapidly days to months facilitating wettability alteration in crude oilbrinerock systems that are initially water wet. The adhesion work could be reduced by the surfactantinduced wettability alteration from oilwet conditions to waterwet conditions. Accordingly, understanding the mechanisms by which a reservoir has acquired oilwet state is the first step in any wettability alteration scheme. The ionic formulation of the injected brine affects dramatically the crude oilbrinerock interfaces, altering rock wettability and improving oil recovery efficiency.
Wettability alteration and spontaneous imbibition in. Both surfactants then were tested for their ability to alter the wettability of sandstone rocks. Wettability alteration by magnesium ion binding in heavy oil. Experimental investigation of silicabased nanofluid. The argument was that elevated temperatures enhance adsorption of the potential determining ions which then modifies wettability to a lessoilwetting state. Effect of temperature, wettability and relative permeability on oil. In this work, the impact of sio2 nanoparticles on the. Research article wettability effects on capillary pressure. Wettability alteration to intermediate gaswetting in low. In this work, application of silica nanoparticles for wettability alteration of initially oilwet calcite was investigated through analysis of surface forces and dlvo theory.
Mechanisms of enhanced oil recovery by surfactantinduced. Solvent retrieval and wettability alteration during heavyoil and bitumen recovery by sosfr steamoversolvent injection in fractured reservoirs method. Wettability alteration is one of the mechanisms of enhanced oil recovery by alkaline flooding. Different measurements were conducted to study the mechanisms of enhanced oil recovery eor by surfactantinduced wettability alteration. Experimental investigations of the wettability of clays. Sep 16, 2017 unlike conventional oil production methods, enhanced oil recovery eor processes can recover most oil products from the reservoir. Fourteen different surfactants were tested for spontaneous imbibition into oilwet chalk cores.
The impacts of nanoparticles on the wettability of. The results from the flow tests demonstrate the effectiveness of wettability alteration from improved gas flow in gaswater systems at 140 and 80c. Wettability alteration and spontaneous imbibition in oilwet. A protocol for determining the effect of water composition on surface alteration is described using simple and less preparation sensitive, brineoil and rockbrineair systems when compared to conventional rockbrineoil measurement methods. In general term, wettability is the tendency of one fluid to spread on or adhere to a solid surface in the presence of other immiscible fluid 2. Experimental investigations of the wettability of clays and. Experimental investigation of sio 2 nanoparticles on enhanced. They observed that the wettability of the matrix of the glass micromodel changed from strongly waterwet to pref.
In this experimental work, a mechanistic study is performed utilizing analytical methods to study the effect of the ionic composition and ionic strength on the rock sample. J petrol explor prod technol wettability alteration to intermediate gaswetting in lowpermeability gascondensate reservoirs shuo zhang 0 1 guancheng jiang 0 1 le wang 0 1 wang qing 0 1 haitao guo 0 1 xinguo tang 0 1 diangang bai 0 1 0 h. Hence, petroleum surface active compounds are capable of rapidly days to months facilitating wettability alteration in crude oilbrinerock systems that are initially water wet. The effects of wettability on relative permeability, journal of petroleum technology39 november 1987. According to this rationale, it becomes questionable if diluted. When the solid wall is not smooth, the value of the apparent contact angle depends on the measuring. How to design drilling fluids to improve recovery in shale plays geoffrey thyne1. Wettability alteration modeling for oilwet calcitesilica. The most common description of wettability is the contact angle, defined as the angle between the tangent to the liquidfluid interface and the tangent to the solid surface, as fig. Evaluation of gas wettability and its effects on fluid distribution and.
In petroleum reservoirs wettability is the tendency of oil to adhere to the reservoir rock surfaces limiting oil movement and recovery. Effects of wettability on capillary pressure, journal of petroleum technology39 october 1987. Wettability alteration of a reservoir, therefore, refers to the reversal process by which the reservoir wettability is restored back to be waterwet. A series experiments were conducted for investigating the effect of wettability alteration on relative permeability for oilwet reservoir sandstones rock with air permeability range from 0. Experimental investigation of sio 2 nanoparticles on. Bai tan hai development company, china national petroleum corporation, tianjin 300289, china 1 s. Wettability alteration in chalk, journal of petroleum. Wettability alteration and spontaneous imbibition in oil.
Wettability is one of most important characteristics for governing the flow and distribution of reservoir fluids in the porous media,the wetting and spreading behavior of liquids on the solid surfaces changes if the wettability of solid surface is altered. Study of wettability of calcite surfaces using oilbrine. Flow in the reservoir is modeled by looking at a single fracture surrounded by matrix on both sides. Wettability alteration of sandstones by silica nanoparticle. N2 compositional changes amongst surface active components of petroleum are. They observed that the wettability of the matrix of the glass. Crains petrophysical handbook wettability of porous rocks. Wettability alteration in gascondensate reservoirs to.
Solvent retrieval and wettability alteration during heavy. Wettability alteration by magnesium ion binding in heavy. It was followed by the active research by the oil company british petroleumbp webb et al. Wettability effects on capillary pressure, relative. The intermediate state between waterwet and oilwet can be caused by a. The mitigation of these attractive forces enhances petroleum extraction and increases the accessibility of previously. This study combines the effect of wettability and interfacialtension ift alteration by surfactants and the corresponding effect on spontaneous imbibition in ulrs from the permian basin through a correlated experimental work flow, which includes conducting contactangle ca and. Pdf a model for wettability alteration in fractured reservoirs. Recent studies show the spreading behavior of liquids on solid surface can be significantly improved after nanofluid treatment. Wettability alteration in chalk wettability alteration in chalk standnes, dag c. Surfactants can be added to frac fluids, in proper concentrations, to alter wettability while fracking the formation.
Chemical agents like surfactants are known as wettability modifiers in carbonate systems. Wettability alteration is an important method to increase oil recovery from oilwet carbonate reservoirs. The role of polar nonhydrocarbons compositional changes amongst surface active components of petroleum are brought about by crude oil. Wettability alteration of carbonate rocks via magnetic fields application. Experimental study of wettability alteration to preferential. The application of nanoparticles in enhancing oil recovery.
Surfactant induced wettability alteration in porous media 159 eugene a. The extended derjaguinlandauverweyoverbeek dlvo theory, which has been often used to calculate the contact angles, is not available to obtain an accurate contact. Dependency of wettability alteration on hydrocarbon. The preference of a solid to contact one liquid or gas, known as the wetting phase, rather than another. Fractional wettability reservoir that has local areas that are strongly oilwet, whereas most of the reservoir is strongly waterwet. Neutral wettability no preferential wettability to either water or oil in the pores. Tang and morrow 1997, 1999 did research on the impact of brine salinity on oil recovery. The behaviour of petroleum components following simulated petroleum migration through an initially watersaturated continuous siltstone 89. The reference experiments and comparative studies for similar systems are discussed in section 4. Doing so, the wettability and zeta potential of calcite surfaces were measured through the sessile drop method and an inhouse experimental setup, respectively. Critical role of wettability alteration in improved oil.
The relative permeability of the oil phase increases with the increase of the waterwetness of the solid surface. Factors that influence wettability alteration are considered, and how this in turn. One method, known as wettability alteration, changes the hydrophilicity of the reservoir rock via decreased surface interactions with crude oils. It was followed by the active research by the oil company british petroleum bp webb et al. Enhanced oil recovery eor using nanofluids has been proposed in recent years, but the mechanism of oil recovery enhancement through nanofluid injection still needs further study. However, the effectiveness of these agents can be increased by the addition of chemicals such as polymers, ionic materials, and nanoparticles. The displacement of oil by reduction of the interfacial tension and the alteration of the wettability upon replacement of the brine with alkalinesurfactant solutions are shown as a function of time. Emulsions and foams in the petroleum industry 79 laurier l. Ulr natural state of oil wet to systems favoring frac fluid imbibition. Experiments have shown wettability alteration can signi cantly decrease capillarity in co 2 storage applications. Surfactant enhanced oil recovery by wettability alteration in. The micromodel sample was designed to compare the silicabased homogeneous water.
Surfactant induced reservoir wettability alteration. Insights into the impact of temperature on the wettability. The role of polar nonhydrocarbons compositional changes amongst surface active components of petroleum are brought about by. Finally, the key results of the work are summarized in section 6. Wettability alteration is discussed in detail in chapter 2. Eclipse reservoir simulator reference manual, schlumberger, 2006.
The irreducible saturation of the wetting phase before wettability alteration airbrine system for water wet sample is smaller than the irreducible saturation of the wetting phase after the wettability of the samples were changed to oilwet airoil system as shown in figures and 14. Surfactant enhanced oil recovery by wettability alteration. Buckley new mexico petroleum recovery research center socorro, new mexico, usa andrew carnegie kuala lumpur, malaysia john edwards bernd herold muscat, oman. Evaluating physicochemical properties of crude oil as. Fundamentals of wettability wael abdallah edmonton, alberta, canada jill s. Aug 17, 2014 wettability alteration is an important method to increase oil recovery from oilwet carbonate reservoirs. In a glass capillary tubeuis altered from 50 to 120 and from 0 to 60 for waterair and normal decaneair systems, respectively. Surfactantinduced wettability alteration has a great effect on the relative permeabilities of oil and water. Unlike conventional oil production methods, enhanced oil recovery eor processes can recover most oil products from the reservoir. Pdf a model for wettability alteration in fractured. Wettability alteration using surfactants additives and.
Wettability alteration in carbonates using zirconium oxide. Similarly, because of wettability alteration with fc722, there is no imbibition of either oil or. Experimental investigations of the wettability of clays and shales. Journal of petroleum science and engineering 2019, 172, 280287. Most of the surfactants were shown to be able to alter wettability of calcite. The role of polar non hydrocarbons compositional changes amongst surface active components of. The study combines the effect of wettability and ift alteration and the corresponding impact on imbibition in ulr by. Seepage laws of oil and water are greatly affected by surfactantinduced wettability alteration. In this study, the porescale performance and mechanism of nanofluid eor were investigated based on a micromodel experiment.1105 105 774 881 825 85 735 970 977 922 96 1174 1228 1341 965 451 225 1281 169 81 1055 898 1494 1086 906 931 1166 38 139