Dynamic capillary pressure analysis of tight sandstone based on digital rock model

Cao, Yixin; Tang, Mingming; Zhang, Qian; Tang, Jiafan; Lu, Shuangfang

doi:10.46690/capi.2020.02.02

Cited by 33 publications

(19 citation statements)

References 32 publications

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“…Based on Equations ( 1), (15), and (16) (summarized in Equation ( 17)), we performed a series of derivations to obtain Equation (18) (the detailed derivation process is shown in Appendix A).…”

Section: Derivation Of Flow Processmentioning

confidence: 99%

See 1 more Smart Citation

Spontaneous Imbibition in a Fractal Network Model with Different Wettabilities

Cai

Zhang

Kang

et al. 2021

Water

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In this work, we derived a mathematical model for spontaneous imbibition in a Y-shaped branching network model. The classic Lucas–Washburn equation was used for modeling the imbibition process occurring in the Y-shape model. Then, a mathematical model for the Newtonian fluid’s imbibition was derived to reveal the relationship between dimensionless imbibition time and length ratio, radius ratio, and wetting strength. The dimensionless imbibition time in the model was adopted to compare with that of the capillary bundle model. Different length and radius ratios were considered in the adjacent two-stage channels, and different wettabilities were considered in the different branches. The optimal radius ratio, length ratio, and wetting strength were calculated under the condition of the shortest imbibition time. In addition, the shortest dimensionless imbibition time of the three-stage Y-shaped branching network model was calculated when the wettability changes randomly. The results indicate that the imbibition time changed mostly when the wettability of the second branch changed, and the second branch was the most sensitive to wettability in the model.

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Section: Derivation Of Flow Processmentioning

confidence: 99%

“…The pressure difference opposed in the tight porous media [12][13][14] is most likely to fail in mobilizing hydrocarbon due to low connectivity of pores. The imbibition processes controlled by capillary force [15,16] gained from the extremely small size of the pores would be the dominant force.…”

Section: Introductionmentioning

confidence: 99%

Spontaneous Imbibition in a Fractal Network Model with Different Wettabilities

Cai

Zhang

Kang

et al. 2021

Water

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“…About 38% of the global and 46% of China's oil and gas resources are of low quality mainly in low-permeability reservoirs, which need to be effectively developed to ensure sustainable development worldwide [1][2][3][4]. In recent years, with the exploration and development of unconventional oil and gas, numerous studies on the efficient development of low-permeability reservoirs have been done by many researchers [5][6][7][8][9][10][11]. With the application of horizontal well, multistage hydraulic fracking and acidizing, synchronous/asynchronous water injection, advanced water injection, lay-ered water injection, and other techniques, the lowpermeability reservoir is commercially and sustainably developed [12][13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

High-Precision Numerical Simulation on the Cyclic High-Pressure Water Slug Injection in a Low-Permeability Reservoir

Zhan

Chao

et al. 2021

Geofluids

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The paper presents a novel waterflooding technique, coupling cyclic high-pressure water slug injection with an asynchronous injection and production procedure, to address the inefficient development of low-permeability oil reservoir in Shengli Oilfield, a pilot test with 5-spot well pattern. Based on the first-hand data from the pilot test, the reservoir model is established. With an in-depth understanding of the mechanism of the novel waterflooding technique, different simulation schemes are employed to screen the best scheme to finely investigate the historical performance of the pilot test. The production characteristics of the pilot test are both qualitatively and quantitatively investigated. It is found that the novel waterflooding technique can provide pressure support within a short period. And the formation around the injector is significantly activated and deformed. Once passing the short stage of the small elastic deformation, the reservoir immediately goes through the dilation deformation accompanied with the opening of microfractures so that the reservoir properties are significantly improved, which leads to better reservoir performance. With the multicyclic dilation-recompaction geomechanical model, the impact of pressure cyclic evolution on the reservoir properties and performance under the novel waterflooding mode of cyclic high-pressure water slug injection is taken into consideration. The historical data of the pilot test is well matched. In the study, a high-precision simulation scheme for the novel waterflooding technique in low-permeability reservoirs is proposed, which provides significant technical support for further optimization of the pilot test and large-scale application of the novel waterflooding technique.

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“…The pore network model [7][8][9] usually uses a simple geometry pore network, which is insufficient to solve the complex pore structure fluid flow. The lattice Boltzmann method [10][11][12][13][14] uses the discrete medium model to simulate fluid motion. Interface capture methods based on Navier-Stokes equations include the volume-of-fluid method (VOF), the level-set method (LSM), and the phase-field method (PFM).…”

Section: Introductionmentioning

confidence: 99%

Phase-Field Simulation of Imbibition for the Matrix-Fracture of Tight Oil Reservoirs Considering Temperature Change

Jin

Cheng

Cao

et al. 2021

Water

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Injection water temperature is often different from that of the reservoir during water injection development in the tight reservoir. Temperature change causes different fluid properties and oil-water interface properties, which further affects the imbibition process. In this paper, a matrix-fracture non-isothermal oil-water imbibition flow model in tight reservoirs is established and solved by the finite element method based on the phase-field method. The ideal inhomogeneous rock structure model was used to study the influence of a single factor on the imbibition. The actual rock structure model was used to study the influence of temperature. The mechanism of temperature influence in the process of imbibition is studied from the micro-level. It is found that the imbibition of matrix-fracture is a process in which the water enters the matrix along with the small pores, and the oil is driven into the macropores and then into the fractures. Temperature affects the imbibition process by changing the oil-water contact angle, oil-water interfacial tension, and oil-water viscosity ratio. Reducing oil-water contact angle and oil-water viscosity ratio and increasing oil-water interfacial tension are conducive to the imbibition process. The increase in injection water temperature is usually beneficial to the occurrence of the imbibition. Moreover, the actual core structure imbibition degree is often lower than that of the ideal core structure. The inhomogeneous distribution of rock particles has a significant influence on imbibition. This study provides microscale theoretical support for seeking reasonable injection velocity, pressure gradient, injection temperature, and well-shutting time in the field process. It provides a reference for the formulation of field process parameters.

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Dynamic capillary pressure analysis of tight sandstone based on digital rock model

Cited by 33 publications

References 32 publications

Spontaneous Imbibition in a Fractal Network Model with Different Wettabilities

Spontaneous Imbibition in a Fractal Network Model with Different Wettabilities

High-Precision Numerical Simulation on the Cyclic High-Pressure Water Slug Injection in a Low-Permeability Reservoir

Phase-Field Simulation of Imbibition for the Matrix-Fracture of Tight Oil Reservoirs Considering Temperature Change

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