Modification of Darcy's law for the threshold pressure gradient

Prada, Álvaro; Civan, Faruk

doi:10.1016/s0920-4105(98)00083-7

Cited by 225 publications

(129 citation statements)

References 3 publications

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“…The typical seepage flow pattern chart of low-permeability reservoir (Fig. 8) shows that there are three types of seepage flow for fluid in low-permeability reservoirs, which are non-flow, nonlinear flow and quasi-linear flow (Prada and Civan 1999;Lu et al 2002;Shi 2006), and plate models can be divided into three sections by types of seepage flow for fluid flowing through, i.e., the non-seepage flow section, the nonlinear seepage flow section and the quasi-linear seepage flow section as pressure gradient change.…”

Section: Resultsmentioning

confidence: 99%

Experimental study on seepage flow patterns in heterogeneous low-permeability reservoirs

Liu

et al. 2017

J Petrol Explor Prod Technol

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Heterogeneous artificial core plate models with low permeability are designed, made and evaluated based on similarity theory of heterogeneous reservoir with lowpermeability physical simulation by artificial core plate model; then, simulative experiments for seepage flow patterns can be carried out. Pressure data are obtained by pressure transducers symmetrically arranged in artificial core plate models to study on the seepage flow patterns in heterogeneous reservoirs with low permeability. Experimental results show that the pressure gradient around injection and production points is high, and the pressure gradient of diagonal corner is very low. The distribution of pressure gradient changes as plane heterogeneity of artificial core plate models changes. The higher permeability increases the spread range of pressure, but the enhancement of heterogeneity has a negative effect on pressure transmission at the same time. The effect of permeability is greater than the negative impact of heterogeneous when the overall permeability of plate model is at a very low level. Non-seepage flow section becomes smaller with the increase in permeability, and the proportion of quasi-linear seepage flow section which is more conducive to fluid flow raise as seepage flow section becomes larger.

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Section: Resultsmentioning

confidence: 99%

Experimental study on seepage flow patterns in heterogeneous low-permeability reservoirs

Liu

et al. 2017

J Petrol Explor Prod Technol

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“…Prada and F. Civan [17] proposed a corrected Darcy's law, which has widely been used to describe the flow in low permeability reservoirs [13][14][15][16]18]. Based on Prada and Civan's research, the production for flow through a crosssection ( Figure 2) of a flow tube can be calculated by…”

Section: Production Of a Flow Tubementioning

confidence: 99%

New prediction method for transient productivity of fractured five-spot patterns in low permeability reservoirs at high water cut stages

Cui

Zhen

et al. 2018

Open Physics

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Predicting the productivity of fractured five-spot patterns in low permeability reservoirs at high water cut stages has an important significance for the development and optimization of reservoirs. Taking the reservoir heterogeneity and uneven distribution of the remaining oil into consideration, a novel method for predicting the transient productivity of fractured five-spot patterns in low permeability reservoirs at high water cut stages is proposed by using element analysis, the flow tube integration method, and the mass conservation principle. This new method is validated by comparing with actual production data from the field and the results of a numerical simulation. Also, the effects of related parameters on transient productivity are analyzed. The results show that increasing fracture length, pressure difference and reservoir permeability correspond to an increasing productivity. The research provides theoretical support for the development and optimization of fractured five-spot patterns at the high water cut stage.

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“…The proper amount of threshold pressure gradient is showed by PTPG. Prada and Civan (1999) proposed their research based on the utilization of brine in the measurement of pressure gradient versus fluid velocity. They go on to argue that fluid mobility reduction causes to decrease the pressure gradient; that is to say that the higher value of rock permeability and higher amount of fluid velocity, the smaller amount of PTPG (Kundu et al 2016;Prada and Civan 1999).…”

Section: Introductionmentioning

confidence: 99%

Integrated production logging tools approach for convenient experimental individual layer permeability measurements in a multi-layered fractured reservoir

Davarpanah

Mirshekari

Behbahani³

et al. 2018

J Petrol Explor Prod Technol

105

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Appropriate estimation of permeability is considered as one of the significant concerns of petroleum industries. Due to the growing demand for hydrocarbon fossil fuels in numerous industries, Petroleum Engineers always try to provide holistic and sustainable solutions to measure this parameter more accurately and to calculate the proper original oil in place (OOIP) and initial reserve. Hence, this accuracy estimation helps engineers whether the production and exploration operations are profitable or not and it might virtually eliminate the unnecessary expenditures. The term production logging tools (henceforth; PLT) involve a wide variety of measurement tools and many sensors. It, too, carries interpretation tools which evaluate the formation properties, in respect of the way PLTs would analyze the formation fluid movements inside and outside of the wellbore and subsequently estimate the production flow rate for each layer. On the other hand, it gives production and completion engineers the chance to investigate the appropriate efficiency of production and perforation processes to organize the remediation methodologies or preplan proper designing for modifying completion procedures which have based on the production logging tools interpretation. The purpose of this comprehensive research is to compare two different techniques (PLT and core analysis) of permeability measurement in a six-layered fractured reservoir and subsequently normalize each parameter to obtain the proper estimation. As a result, according to the evaluation of each technique, the amount of permeability in the layers 1, 2, 3, and 5 is relatively close to each other. Furthermore, regarding higher expenses of core analysis tests and the reliability of PLTs according to the results of this paper in the four out of six individual layers, Emeraude software by utilizing PLT interpretation could be a substitution and preferable methodology instead of core analysis measurements.

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Modification of Darcy's law for the threshold pressure gradient

Cited by 225 publications

References 3 publications

Experimental study on seepage flow patterns in heterogeneous low-permeability reservoirs

Experimental study on seepage flow patterns in heterogeneous low-permeability reservoirs

New prediction method for transient productivity of fractured five-spot patterns in low permeability reservoirs at high water cut stages

Integrated production logging tools approach for convenient experimental individual layer permeability measurements in a multi-layered fractured reservoir

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