A Novel Numerical Model of Gelant Inaccessible Pore Volume for In Situ Gel Treatment

Leng, Jianqiao; Sun, Xindi; Wei, Mingzhen; Bai, Baojun

doi:10.3390/gels8060375

Cited by 2 publications

(1 citation statement)

References 67 publications

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“…Since there is a high water content in them, scientific and technical solutions for blocking permeable areas of the reservoir become crucial. In this regard, ways to use effective water insulation compositions are being investigated [ [2], [3]]. A considerable number of compositions are known and great experience of their application in various geological and physical conditions has been accumulated.…”

Section: Introductionmentioning

confidence: 99%

The method of non-stationary flooding and the conditions for its effective use in the operation of an oil field

Effendiyev,

Moldabayeva,

Tuzelbayeva

et al. 2023

KIMS/CUMR/MShKP

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The article describes the essence of unsteady waterflooding, which is one of the most effective methods of increasing the oil recovery factor, used to change the direction of filtration flows, which makes it possible to engage in the development of undeveloped oil reserves and reduce the rate of watering of the deposit in productive reservoirs. A common technological method of unsteady water flooding is the use of cyclic modes of operation of injection wells. The essence of this method is that at an unsteady state in the oil deposit, there are conditions for the continuous manifestation of elastic forces of the reservoir system. In a heterogeneous reservoir between different zones, channels, and fluid flows there are gradients of hydrodynamic pressures, due to which there can be fluid flows from one layer to another, from fractures to blocks, as well as changes in flow directions. During unsteady flooding of heterogeneous formations, a part of oil reserves in low-permeability layers or zones remains uncovered by injected water. The waterflooded reservoir appears as an unsystematic alternation of watered and oil-saturated microflows. While creating in such reservoirs alternately changing in value and direction of pressure gradients, conditions for injection water penetration into stagnant oil-saturated low-permeable zones and channels appear in the oil reservoir and oil movement from them to active drainage zones. As a result of the analysis, the positive effect of the implementation of unsteady waterflooding technology was revealed, and recommendations for improving its application at other operational facilities of oil fields were given.

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Section: Introductionmentioning

confidence: 99%

The method of non-stationary flooding and the conditions for its effective use in the operation of an oil field

Effendiyev,

Moldabayeva,

Tuzelbayeva

et al. 2023

KIMS/CUMR/MShKP

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Polymer Gel for Water Shutoff in Complex Oil and Gas Reservoirs: Mechanisms, Simulation, and Decision-Making

Jia,

Li,

Zhang

2023

SPE Journal

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Summary Gel treatment is often used for water shutoff in high water-cut oil or gas wells. Although the properties and usage methods of gel have been well documented by different investigators, gel treatment performance is not always satisfactory in field application, especially in oil or gas reservoirs with complex conditions, such as strong bottomwater reservoirs, high-permeability-ratio oil reservoirs, and fractured gas reservoirs. In this work, we attempt to improve gel treatment application in complex situations according to the causes of disappointing performance, including unreliable numerical simulation and the misapplication of experiences. We propose a new numerical simulation method of gel treatment mechanisms and verify it by improving the acquiring method of inaccessible pore volume (IAPV), dynamic polymer adsorption (DPA), and the simulation method of disproportionate permeability reduction (DPR). The performance and optimization measures of gel treatment in different types of complex oil and gas reservoirs are discussed extensively. Moreover, the dominant influencing factor of the gel treatment effect is determined by gray relation analysis to provide more direct and effective suggestions for field application. The results suggest that the improved access methods for IAPV and DPA can help to obtain more precise parameters easily to construct a numerical gel model. In addition, the new DPR simulation method, which considers oil or gas blocking, reduces the overestimation of gel DPR ability obtained with the conventional method. The misapplication of gel treatment experience probably causes a disappointing response, for example, gel treatment time had opposite influences on water shutoff in strong bottomwater reservoirs and high-permeability-ratio oil reservoirs, and the experience of reservoir thickness in oil reservoirs was not suitable for gas reservoirs. Furthermore, the major factors of gel treatment are varied in different oil and gas reservoirs, demonstrating that primary evaluation indicators for candidate wells are not permanent.

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A Novel Numerical Model of Gelant Inaccessible Pore Volume for In Situ Gel Treatment

Cited by 2 publications

References 67 publications

The method of non-stationary flooding and the conditions for its effective use in the operation of an oil field

The method of non-stationary flooding and the conditions for its effective use in the operation of an oil field

Polymer Gel for Water Shutoff in Complex Oil and Gas Reservoirs: Mechanisms, Simulation, and Decision-Making

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