Investigation of Caprock Integrity Due to Pressure Build-up During High-volume Injection into the Utsira Formation

Gasda, Sarah E.; Wangen, Magnus; Bjørnarå, Tore Ingvald; Elenius, Maria

doi:10.1016/j.egypro.2017.03.1444

Cited by 22 publications

(13 citation statements)

References 7 publications

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“…13is the overpressure at the given time and place. Therefore, the pressure p 0 is a function of time in the uplift estimate (13). The estimated uplift is close to the uplift computed from the 3D poroelastic model.…”

Section: Numerically Computed Uplift Compared With 1d Upliftsupporting

confidence: 73%

“…The advantages of this decoupling, when it is applied to model large scale poroelastic deformations from CO 2 injection, have been demonstrated by Bjørnarå et al [9], Gasda et al [13].…”

Section: D Vertical Upliftmentioning

confidence: 97%

“…The pressure amplitude is a 0 = 1 MPa and it is seen that displacement field is proportional to p 0 . From equation (13) and the numbers above we get that the 1D uplift, resulting from the expansion of the reservoir, is w = 4.5 mm. The finite element grid has 100 × 15 = 1500 nodes.…”

Section: Numerical Verificationmentioning

confidence: 99%

“…This section gives an example of numerically computed surface uplift, which is compared with the estimate (13). The example is a case study of fluid injection into the Utsira formation in the Sleipner field in the North Sea.…”

Section: Numerically Computed Uplift Compared With 1d Upliftmentioning

confidence: 99%

“…Such 1D estimates are very useful, since they can be applied directly to the pressure field from flow simulations, especially when the flow simulations can be performed decoupled from the geomechanics [9]. This method is extremely efficient when coupled with reduced order models for pressure increase from high volume injection of CO 2 into heterogeneous systems with large areal extent [13]. This simple method is therefore an attractive approach, however, its range of validity has been poorly quantified.…”

Section: Introductionmentioning

confidence: 99%

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An analytical plane-strain solution for surface uplift due to pressurized reservoirs

Wangen

Halvorsen

Gasda

et al. 2018

Geomechanics for Energy and the Environment

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In this paper, we present an analytical plane strain solution for surface uplift above pressurized reservoirs. The solution is based on a Fourier representation of the reservoir pressure. The plane strain model is developed in two stages: First, an exact solution is derived for the displacement field for the reservoir alone subjected to a periodic overpressure distribution of one wavelength. This one-layer model forms the basis for the analytical plane strain solution for a two-layer model-a pressurized reservoir with an overburden. We give an example where numerically computed uplift is quite accurately estimated by a simple 1D estimate, except for in the near well area. The plane-strain solution is well suited to study conditions for when the simple 1D approximation of the uplift is accurate. A condition for the accuracy of the simple 1D approximation is first derived for just the reservoir expanded by a periodic overpressure distribution of one wavelength, which corresponds to one term in a Fourier series. The 1D estimate is accurate for wavelengths larger than 2π times the reservoir thickness. Then, a condition is derived for when the 1D estimate is accurate for the two-layer model. We show that the wavelength of the overpressure distribution must be larger than 2π times the maximum of the reservoir thickness and the overburden thickness for the 1D approximation to be accurate. We demonstrate how uplift is computed from a Fourier decomposition of the reservoir overpressure. The resulting uplift is analysed in terms of Fourier coefficients, using the knowledge of how a single wavelength behaves. The analytical results for the displacement field and the uplift are tested by comparison with finite element simulations, and the match is excellent.

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Section: Numerically Computed Uplift Compared With 1d Upliftsupporting

confidence: 73%

“…The advantages of this decoupling, when it is applied to model large scale poroelastic deformations from CO 2 injection, have been demonstrated by Bjørnarå et al [9], Gasda et al [13].…”

Section: D Vertical Upliftmentioning

confidence: 97%

Section: Numerical Verificationmentioning

confidence: 99%

Section: Numerically Computed Uplift Compared With 1d Upliftmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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