An Integrated Experimental Approach to Determining How Invaded Mud Components Modify Near-Wellbore Properties (Russian)

Mikhailov, D. N.; Ryzhikov, N.; Shako, V.; Theuveny, B.

doi:10.2118/171291-ru

Cited by 4 publications

(1 citation statement)

References 12 publications

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“…2). In order to compare the novel model against the classical one [2]- [5], the numerical simulations of experiments [14] are carried out. In these experiments, the suspension was injected into different "clean" porous samples and the profiles of trapped particle concentration was measured.…”

Section: Critical Velocity Of Mobilizationmentioning

confidence: 99%

Multi-Fluid Model for Suspension Filtration in Porous Media: Effects of Particle Trapping and Mobilization

Tolmacheva

Боронин

Осипцов

2017

Computational and Experimental Methods in Multiphase and Complex Flow IX

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We present the further development of the multi-fluid model of suspension filtration in porous media. The model is derived from conservation laws in the multi-fluid approach, where the three phases, namely the carrier fluid, the suspended particles, and the particles trapped in pores, are treated as three different continua described by hydrodynamic variables. Fluid fluxes through large pores of the porous medium and through narrow pores of the packed bed of deposited particles are explicitly taken into account by introducing two permeabilities. These are the key novel features which distinguish it from the classical deep bed filtration model. The model predictions are compared with laboratory data sets on the contamination of core samples. The most recent progress in the model development is mainly in taking into account particle mobilization and compressibility of the fluid. Applications of the model are primarily in the oil and gas industry: drilling mud invasion and cleanup in the near-wellbore zone, suspension filtration in propped hydraulic fractures, as well as permeability damage and recovery in the near-wellbore zone of injection wells, which are used to maintain reservoir pressure.

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Section: Critical Velocity Of Mobilizationmentioning

confidence: 99%

Multi-Fluid Model for Suspension Filtration in Porous Media: Effects of Particle Trapping and Mobilization

Tolmacheva

Боронин

Осипцов

2017

Computational and Experimental Methods in Multiphase and Complex Flow IX

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Modeling of Rock Permeability Damage and Repairing Dynamics Due to Invasion and Removal of Particulate from Drilling Fluids

et al. 2017

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Modelling of Injection Well Capacity with Account for Permeability Damage in the Near-Wellbore Zone for Oil Fields in Western Siberia

Боронин

Tolmacheva

Осипцов

et al. 2017

Day 2 Tue, October 17, 2017

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One of the key fundamental problems in using in jection wells to maintain the reservoir pressure for efficient roduction from oil and gas wells is the colmatation of the near-wellbore zone, which results in the permeability damage, and, hence, the decrease in the injectivity. In these cases one needs to increase the pumping pressure or introduce additional filtering systems on surface, which generally increases the cost of field development. For optimization of the flooding process, it is proposed to use a combined approach based on modeling of suspension filtration with account for colmatation of the near-wellbore zone and applying a cycling regime of injection. A 1D three-continua model is proposed for suspension filtration to describe the permeability damage in the near-wellbore zone of injection wells in the fields of Western Siberia. Governing equations are derived using the multi-continua approach. The carrier phase, as well as the particles, which are being transported and deposited, are described as three distinct continua in terms of field variables. The application of the multi-continua approach allows one to reduce the number of free parameters of the model. The model takes into account the effects of sedimentation (trapping) of particles in the pores (colmatation), mobilization of particles at the velocities higher than a certain threshold value. The model has gone through a thorough validation campaign against significant amount of experimental data with contamination of porous samples by suspensions (core flooding experiments) and mobilization of pre-seeded particles in sand packs. Experimental study of self-colmatation of cores produced from Vendian deposits in one of West Siberian oilfields during the injection of a particle-free fluid. It is found that at a fixed filtration rate, the permeability of rock cores decreases and levels off. An increase in filtration rate results in further decrease of the permeability. In order to reproduce the experimental data on self-colmatation, the three-continua model of filtration was modified to take into account two types of deposited particles: particles attached to pore walls, which are the source of migrating particles, and the particles plugging or bridging the pore throats, which reduce the permeability of the porous medium. The numerical simulations showed that the modified model allows to reproduce the self-colmatation of natural cores, the values of free parameters were found by tuning the model against theobtained experimental data. We carried out the simulations of distributions of reduced permeablity, concentration of suspended particles and the concentration of trapped particles in pores in the nearwellbore zone at continuous and periodic water flooding. It is found that there are periodic regimes of water injection, in which the permeability of the rock is not damaged. The study will be continued after the generalization of suspension filtration model to describe colmatation of a rock both by external and internal fines as well as the calibration of the model against data of experiments carried out using on natural cores.

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An Integrated Experimental Approach to Determining How Invaded Mud Components Modify Near-Wellbore Properties (Russian)

Cited by 4 publications

References 12 publications

Multi-Fluid Model for Suspension Filtration in Porous Media: Effects of Particle Trapping and Mobilization

Multi-Fluid Model for Suspension Filtration in Porous Media: Effects of Particle Trapping and Mobilization

Modeling of Rock Permeability Damage and Repairing Dynamics Due to Invasion and Removal of Particulate from Drilling Fluids

Modelling of Injection Well Capacity with Account for Permeability Damage in the Near-Wellbore Zone for Oil Fields in Western Siberia

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