A Method for Simultaneous Determination of Permeability and Porosity in Low-Permeability Cores

Haskett, Steven E.; Narahara, G.M.; Holditch, Stephen A.

doi:10.2118/15379-pa

Cited by 52 publications

(29 citation statements)

References 7 publications

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“…To measure the matrix permeability, pressure-pulse-decay method is applied using a setup as shown in Figure 3. After loading a core sample in the coreholder, a pressure-pulse is generated at the core upstream using nitrogen; core permeability can be calculated from the measured pressure-decay curve from the upstream and/or the pressure response from the downstream [38,39]. For different damage-evaluation tests, their detailed procedures are delineated in the section of evaluation of permeability damage due to different working fluids.…”

Section: Core Samples Frommentioning

confidence: 99%

Formation Damage due to Drilling and Fracturing Fluids and Its Solution for Tight Naturally Fractured Sandstone Reservoirs

Liang

Yao

et al. 2017

Geofluids

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Drilling and fracturing fluids can interact with reservoir rock and cause formation damage that impedes hydrocarbon production. Tight sandstone reservoir with well-developed natural fractures has a complex pore structure where pores and pore throats have a wide range of diameters; formation damage in such type of reservoir can be complicated and severe. Reservoir rock samples with a wide range of fracture widths are tested through a multistep coreflood platform, where formation damage caused by the drilling and/or fracturing fluid is quantitatively evaluated and systematically studied. To further mitigate this damage, an acidic treating fluid is screened and evaluated using the same coreflood platform. Experimental results indicate that the drilling fluid causes the major damage, and the chosen treating fluid can enhance rock permeability both effectively and efficiently at least at the room temperature with the overburden pressure.

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Section: Core Samples Frommentioning

confidence: 99%

Formation Damage due to Drilling and Fracturing Fluids and Its Solution for Tight Naturally Fractured Sandstone Reservoirs

Liang

Yao

et al. 2017

Geofluids

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“…The data from the pulse decay experiment can be manipulated in two different ways: a straight-line method (Brace et al 1968;Dicker and Smits 1988;Jones 1997) and type curve matching Haskett et al 1988;Kamath et al 1992). ''Straight-line'' method requires the determination of the slope of the straight-line in a semilog plot of pressure decay versus time.…”

Section: Introductionmentioning

confidence: 99%

“…The straight-line approach reduces the amount of work done; however, the slightly compressible equation, as mentioned previously, does have limitations when dealing with gases. Finally, Haskett et al (1988) were the first to propose the use of the pseudo-pressure and pseudo-time approach to analyze the pulse decay experiments. The advantage of the pseudo-pressure approach is that changes in viscosity and compressibility during the experiment can be accounted for in the governing equation.…”

Section: Introductionmentioning

confidence: 99%

“…The advantage of the pseudo-pressure approach is that changes in viscosity and compressibility during the experiment can be accounted for in the governing equation. However, Haskett et al (1988) method had two limitations. First, the method requires the conversion of the differential pressure data to pseudo-pressures, which can be problematic due to the nonlinear relationship between pressure and pseudo-pressure at low pressures.…”

Section: Introductionmentioning

confidence: 99%

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Gas permeability measurements from pressure pulse decay laboratory data using pseudo-pressure and pseudo-time transformations

Abdelmalek

Karpyn

Liu

et al. 2017

J Petrol Explor Prod Technol

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This paper presents a pseudo-pressure and pseudo-time straight-line approach to interpret laboratory pulse decay data in order to estimate rock core permeability using gas as the pore fluid. The implementation of the straight-line approach provides a practical method to estimate gas permeability from experimental data, as long as changes in gas viscosity and compressibility are negligible. On the other hand, pseudo-pressure and pseudo-time allow the transformation of the compressible flow equation from its highly nonlinear form to a quasi-linear partial differential equation, where changes in gas viscosity, gas compressibility and compressibility factor are accounted for. The purpose of this work is to combine both, pseudofunctions and the straight-line approach to estimate gas permeability from pressure pulse laboratory data with a more rigorous treatment of gas properties. Five pulse decay experiments were performed in Marcellus shale cores at pore pressures ranging from 130 to 700 psi in a triaxial cell to estimate permeability and porosity of ultra-low permeability cores. The experiments were made in an increasing order of equilibration pressure starting from 130 until 700 psi, and vertical and radial stresses kept constant at 1500 psi. Permeability estimates were compared against the P 2 -approach to show the validity of the proposed method at low gas pressures.

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“…To overcome these limitations, the transient flow method has emerged as a successful alternative to estimate the hydraulic properties of low permeability materials such as rocks, soils (Haskett et al, 1988;Carles et al, 2007;Barral et al, 2009), concrete (Figg, 1973;Claisse et al, 2003), asphalt coating (Li et al, 2004) and bentonite geocomposite (Mendes et al, 2010;Pitanga et al, 2011).This method is essentially founded on monitoring of system's pressure drop as the gas passes through the permeable barrier. Therefore, compared with the conventional method for measuring permeability in a permanent flow regime, the pressure drop method seems to have advantages such as simplicity, economy and quick results.…”

Section: Introductionmentioning

confidence: 99%

Gas permeability of bentonite barriers: development, construction and testing of a measurement system

2016

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This article proposes a testing device to quickly and reliably estimate the gas permeability of bentonite-based clay barriers used in landfill cover systems. The testing methodology is based on a transient gas flow regime that passes through the barrier, therefore not requiring the use of sophisticated equipment that aim to maintain constant differential pressure and measure the gas flow, common requirements for testing methods under a permanent flow regime. To confirm the feasibility of the proposed technique, tests were performed on a pure hydrated bentonite layer, which subsequently encompassed samples of geosynthetic clay liner (GCL) at different moisture contents. Geosynthetic clay liners are often selected as a part of the barrier layer for cover systems in solid waste landfills to prevent infiltration of rainfall and migration of biogas into the atmosphere. The results confirmed the equipment reliability and differentiate the different responses of the gas flow barriers studied, considering their different compositions and different moistures.

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A Method for Simultaneous Determination of Permeability and Porosity in Low-Permeability Cores

Cited by 52 publications

References 7 publications

Formation Damage due to Drilling and Fracturing Fluids and Its Solution for Tight Naturally Fractured Sandstone Reservoirs

Formation Damage due to Drilling and Fracturing Fluids and Its Solution for Tight Naturally Fractured Sandstone Reservoirs

Gas permeability measurements from pressure pulse decay laboratory data using pseudo-pressure and pseudo-time transformations

Gas permeability of bentonite barriers: development, construction and testing of a measurement system

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