Numerical simulation study of factors affecting relative permeability modification for water-shutoff treatments

Alfarge, Dheiaa; Wei, Mingzhen; Bai, Baojun

doi:10.1016/j.fuel.2017.06.041

Cited by 40 publications

(13 citation statements)

References 44 publications

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“…Then, the concentration gradient dH dS between the two sides decreases, and the seepage velocity v tends to vary at an increasingly lower rate, especially during the last two weeks of storage. Decrease regulations explained above are also consistent with results obtained in previous works [32][33][34], and this kind of nonlinear decline can guide practical usage of these new civil explosive products.…”

Section: Study On a New Cleaner Emulsion Explosive Containing Common supporting

confidence: 89%

Study on a New Cleaner Emulsion Explosive Containing Common Clay

Zhou

Shen

et al. 2018

Propellants Explo Pyrotec

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This paper introduces a novel emulsion explosive, which has three primary advantages, namely, the ability to easily adjust various detonation properties to desired values, decrease the overall cost of civil explosive products, and minimize environmental pollution during use. Immediate and time‐related experiments are performed in order to identify changing detonation properties of these new formulas. Our results show that both common clay and hollow glass micro‐spheres (HGMs) function as thermal diluents, which indicates that for a larger quantity of these additives, the weaker are the detonation properties under the condition of our experimental ratios (HGMs: from 5 wt.% to 15 wt.%; common clay: from 0 wt.% to 20 wt.%). Furthermore, a comparison of four alternative emulsion explosive compositions reveals that the longest storage time in this study is 5 weeks with No. 3‐3, which contains 15 wt.% HGMs and 10 wt.% common clay. In addition, nonlinear attenuation is observed and explained for that period.

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Section: Study On a New Cleaner Emulsion Explosive Containing Common supporting

confidence: 89%

Study on a New Cleaner Emulsion Explosive Containing Common Clay

Zhou

Shen

et al. 2018

Propellants Explo Pyrotec

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“…Table 1 lists the adsorption energies (E ads ) calculated by the PBE+DFT-D and other methods, along with the distances between the graphene plane and the CH 4 or H 2 O molecules. The binding energy (−24.90 kJ/mol) and distance (3.22 Å) of CH 4 adsorption on graphene predicted by PBE+DFT-D closely match the experimental values of −13.5 kJ/mol and 3.03 Å [38]. They also resemble the values found in previous theoretical calculations; for example, −31.8 kJ/mol and 3.36 Å, as reported by [36].…”

Section: Ch 4 and H 2 O Adsorption On Graphenesupporting

confidence: 87%

“…The reason is that H 2 O molecules, which can form a hydrogen-bond network, can partially trap CH 4 molecules to reduce their mobility. This effect, sometimes known as the WBE, can be observed in coalbed extraction processes [38]. Residual fracturing fluid can be present at the entrance of micropores in the coalbed and act like seals to prevent methane from leaving those pores.…”

Section: Diffusivity Of Chmentioning

confidence: 99%

A Multi-Scale Modeling of CH4 and H2O Adsorption on Coal Molecules and the Water Blocking Effect in Coalbed Methane Extraction

Yang¹,

Li³

et al. 2019

Applied Sciences

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Coalbed methane (CBM) is of great economic value. However, at the same time, CBM is facing a multitude of technological challenges. The water blocking effect (WBE) is one of the physical effects that controls the production of CBM. To alleviation WBE, it is necessary to study its mechanisms at the molecular level. In this study, we used a combined first-principles calculation and molecular simulation approach to investigate the adsorption and diffusion of both methane and water in coal. The results suggest that water does not compete with methane in the adsorption on coal surfaces, yet the presence of water significantly slows down the diffusion of methane within the micropores of coal. This work not only explains the fundamental mechanisms of the WBE but also provides a simulation framework for building strategies to alleviate WBE.

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“…(Elkins and Poppe 1973;Li and Chen 2001); especially, it is more meaningful to study the distribution characteristics of remaining oil by using the data of seal coring wells at present (Hirasaki 1996). Based on the numerical simulation of experimental data, the effects of relative permeability, capillary pressure, and reservoir parameters on the recovery rate of the water-driven reservoir are deduced (Alfarge et al 2017). Li et al (2016) reasonably deduced the water flooding status of underground strata based on seal coring samples.…”

Section: Introductionmentioning

confidence: 99%

Study on the relationship between the water cutting rate and the remaining oil saturation of the reservoir by using the index percolating saturation formula with variable coefficients

Zhang

Fan

Liu

2020

J Petrol Explor Prod Technol

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The water cutting rate is recorded dynamically during the production process of a well. If the remaining oil saturation of the reservoir can be deduced based on the water cutting rate, it will give guidance to improve the reservoir recovery and can save expensive drilling costs. In the oil–water two-phase seepage experiment on core samples, the oil and water relative permeability reflects the relationship between the water cutting rate and water saturation, that is, percolating saturation formula. The relative permeability test data of 17 rock samples from six seal coring wells in Daqing Changyuan were used to optimize and construct the coefficients of the index percolating saturation formula that vary with the pore structure parameters of reservoirs, to form an index percolating saturation formula with variable coefficients that is more consistent with the regional geological characteristics of the reservoir. Based on this, the formula of water saturation calculated by the water cutting rate is deduced. And the high-precision formula for calculating the irreducible water saturation and residual oil saturation by effective porosity, absolute permeability, and shale content is given. The derivative formula of water saturation on the water cutting rate was established, and the parameters of 17 rock samples were calculated. It was found that the variation velocity of water saturation of each sample with the water cutting rate presented a “U” shape, which was consistent with the actual characteristics that the variation velocity of the water saturation in the early, middle, and late stages of oilfield development first decreased, then stabilized, and finally increased rapidly. The research results were applied to the prediction of remaining oil saturation in the research area, and the water saturation about six producing wells was calculated by using their present water cutting rates, and the remaining oil distribution profile was predicted effectively. The analysis of four layers of two newly drilled infill wells and reasonable oil recovery suggestions were given to achieve good results.

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Numerical simulation study of factors affecting relative permeability modification for water-shutoff treatments

Cited by 40 publications

References 44 publications

Study on a New Cleaner Emulsion Explosive Containing Common Clay

Study on a New Cleaner Emulsion Explosive Containing Common Clay

A Multi-Scale Modeling of CH4 and H2O Adsorption on Coal Molecules and the Water Blocking Effect in Coalbed Methane Extraction

Study on the relationship between the water cutting rate and the remaining oil saturation of the reservoir by using the index percolating saturation formula with variable coefficients

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