Role of sorption processes with the motion of polymer solutions in a porous medium

Entov, V. M.; Polishchuk, A. M.

doi:10.1007/bf01015266

Cited by 9 publications

(2 citation statements)

References 8 publications

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“…The results showed the fitting between the thermodynamic system and the quasilinear equation theory (Rhee et al, 1970). Entov and Polishchuk (1975) studied the effects of adsorption and diffusion in filtration process through experimental data.…”

Section: Introductionmentioning

confidence: 98%

The Displacement of Oil by Polymer Slugs Considering Adsorption Effects

Ribeiro

Pires

2008

SPE Annual Technical Conference and Exhibition

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Oil displacement by injection of chemical solutions is a widespread Enhanced Oil Recovery method. Analytical models for one-dimensional displacement of oil by water with chemical components have been developed since the 1960´s. This problem involves complex physical-chemical processes of interphase mass transfer, phase transitions and transport properties changes. The continuous injection of this kind of fluid would be very expensive, so, the injection of chemical slugs is an attractive alternative to improve the recovery of mature oil fields. The continuous injection of chemical solutions is a Riemann problem, easily solved by the introduction of a self-similar variable. Nevertheless, the slug injection is not self-similar, and the problem becomes much more complex from the mathematical point of view. This paper presents the analytical solution of chemical slug injection in an oil reservoir. A flow potential associated with the conservation of the aqueous phase is introduced as a new independent variable instead of time. This change of variables allows the system splitting into one equation (lifting equation) and a thermodynamic system (auxiliary system). The number of auxiliary equations is less than the number of equations in the compositional model by one. In this paper different adsorption isotherms were analyzed. The transport equation solution, or lifting problem solution involves interaction between waves of different families and allows the design of slug sizes in order to obtain the maximum efficiency of this process. Another important application of these solutions is the prediction of chemical flooding regardless of the transport properties (relative permeabilities and viscosities). If the mobility ratio is close to one, this model may be applied in the development of streamlines simulators.

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Section: Introductionmentioning

confidence: 98%

The Displacement of Oil by Polymer Slugs Considering Adsorption Effects

Ribeiro

Pires

2008

SPE Annual Technical Conference and Exhibition

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“…The curves of the relative phase permeabilities are the same as in [3][4][5]. Adsorption of surface-active substances (SASs) from the micellar solution by the porous skeleton was ignored, and absorption of the polymer was considered to obey Henry's law [6] with Γ = 0.3. The flooding regime considered was a tertiary oil recovery process: the initial oil concentration in the porous medium was equal to the residual oil saturation during flooding: s 0 10 = (s 0 1w ) * .…”

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confidence: 99%

Simulation of micellar-polymer flooding of a layered oil reservoir of nonuniform thickness

Khabeev

Inogamov

2008

J Appl Mech Tech Phy

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The dynamics of oil displacement from a layered reservoir of nonuniform thickness consisting of two hydrodynamically connected layers of different absolute permeability is studied. Results of numerical calculations are given. The influence of the main determining factors on the oil displacement dynamics is studied.A promising method for increasing the reservoir production is micellar-polymer flooding [1]. Because of the low surface tension on the boundary of the micellar solution with the reservoir fluids, almost the entire oil is set in motion. The higher viscosities of the micellar solution and the injected spacer fluid bank (aqueous polymer solution) compared to the oil viscosity allow an increase in the displacement area.As is known, real oil reservoirs are nonuniform, one of the main types of nonuniformity of porous media is permeability variation across a section of monolithic reservoirs [1]. We consider the profile problem [2] in a two-dimensional region. A mathematical model for micellar-polymer flooding is given in [3]. In [4], this model is extended to the case of nonuniform layered reservoirs, and in [5], to the case of pattern flooding in a well system.The present paper gives the results of a numerical study of micellar-polymer flooding based on models [3-5] for the case of a nonuniform layered reservoir.1. Oil Displacement from a Nonuniform Layered Reservoir with Specified Volume Flow Rate of the Injected Fluid. We consider various flooding modes in increasing order of complexity.We first study oil displacement by water in an oil reservoir of nonuniform thickness consisting of two layers of different absolute permeability (Fig. 1). We solve the problem with a specified volume flow rate of the injected fluid Q(t). Let the filtration region be a square (l y = l x ). The parameters of the porous medium and the hydrodynamic parameters of the fluids (oil and water) being filtered are chosen as follows: (s 0 α ) * = 0, k α = (s 0 α ) 2 , μ α = const, and s 0 10 = 1. We also set Q(t) = 1, l x = l y = 1, and k (1) = 1. Figure 2 shows oil saturation isolines at the moment of injection of a water volume 0.2V pore , for uniform reservoir (k (2) = k (1) = 1) and nonuniform reservoir (k (2) = 6).Unlike in the uniform reservoir, the displacement dynamics in the reservoir of nonuniform thickness has the following features: in the high-permeability layer, the fluids move more rapidly, and although in the bottom low-permeability layer, the absolute permeability is the same as in the uniform layer, the fluids in it move more slowly. According to the problem formulation, the amount of the fluid injected into each layer is identical in the uniform and nonuniform cases. Therefore, the lower rate of displacement in the lower layer compared to that in the uniform layer is explained by the cross-flow of part of the fluid from this layer to the top layer. Hence, in the high-permeability layer, the filtration flux is higher. Nevertheless, with time, the displacement covers the entire zone of low permeability. In this case, ac...

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Lag of the front of the polymer behind the carrier liquid with the filtration of a polymer through a porous medium

Ogandzhanyants¹,

Polishchuk²

1977

Fluid Dyn

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Role of sorption processes with the motion of polymer solutions in a porous medium

Cited by 9 publications

References 8 publications

The Displacement of Oil by Polymer Slugs Considering Adsorption Effects

The Displacement of Oil by Polymer Slugs Considering Adsorption Effects

Simulation of micellar-polymer flooding of a layered oil reservoir of nonuniform thickness

Lag of the front of the polymer behind the carrier liquid with the filtration of a polymer through a porous medium

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