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Keywords: calculation
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Journal Articles
Journal: SPE Journal
SPE J. (2022)
Paper Number: SPE-209804-PA
Published: 27 April 2022
... reproduction run state vector input variable trajectory spe journal vector artificial intelligence upstream oil & gas calculation weight matrix bridge particle location state variable prediction run formulation snapshot closest run parallel bridge matrix gradient Solid particles...
Journal Articles
Journal: SPE Journal
SPE J. 27 (02): 1049–1063.
Paper Number: SPE-208600-PA
Published: 13 April 2022
..., is rarely involved. In this paper, a theoretical model for calculating the maximum gas entrapment concentration (MGEC) is established for the first time. The critical distance between horizontal and vertical entrapped bubbles was determined by the yielded region caused by the buoyancy and the coupled stress...
Journal Articles
Journal: SPE Journal
SPE J. (2022)
Paper Number: SPE-209618-PA
Published: 11 April 2022
... reservoir area, which could be more reasonable to evaluate the stimulation scope of the reservoir; (2) calculating the fractal dimension (FD) of the 3D spatial structure based on the point-cloud processing, which could directly reflect the complexity of the fracture network. Finally, a new evaluation index...
Journal Articles
Journal: SPE Journal
SPE J. 27 (01): 17–38.
Paper Number: SPE-204025-PA
Published: 16 February 2022
...E. Cayeux; S. Stokka; E. W. Dvergsnes; J. L. Thorogood Summary Torque and drag models have been used for several decades to calculate tension and torque profiles along drillstrings, casing strings, and liner strings. Buoyancy forces contribute to the loads acting on the pipe and affect its...
Journal Articles
Journal: SPE Journal
SPE J. 27 (01): 532–551.
Paper Number: SPE-206743-PA
Published: 16 February 2022
... in published articles about gas/liquid flow in the oil and gas industry. It is shown that the algorithm can calculate both pressure and material fast waves generated during the transportation of gas and liquid in pipes. The solution algorithm is based on the application of a two-fluid model to the mass...
Journal Articles
Journal: SPE Journal
SPE J. 27 (01): 914–928.
Paper Number: SPE-205447-PA
Published: 16 February 2022
.... The solution of the P-H flash calculation is obtained by maximizing the entropy S : (5) max S ( P , T , n ) , where n is the number of moles for each component, subject to (6) H ( P , T , n ) = H spec P = P spec , and to the mass balance...
Journal Articles
Journal: SPE Journal
SPE J. 26 (06): 3389–3409.
Paper Number: SPE-204453-PA
Published: 15 December 2021
... between actual stress and a calculation with this model depends on, of course, the degree to which the assumptions are broken. In some situations it can provide estimates in good agreement with direct measurements, but the basic assumptions should always be evaluated and, whenever possible, should...
Journal Articles
Journal: SPE Journal
SPE J. 26 (04): 2397–2416.
Paper Number: SPE-205499-PA
Published: 11 August 2021
... multiphase equilibrium calculations using a nested approach. The proposed algorithm is simple because a robust PT multiphase equilibrium algorithm is used in the inner loop without any further modifications, while an effective equation-solving method (i.e., Brent’s method; Brent 1971) is applied in the outer...
Journal Articles
Journal: SPE Journal
SPE J. 26 (04): 1652–1665.
Paper Number: SPE-205025-PA
Published: 11 August 2021
...F. Cala; E. Nuñez; N. Bahamón; J. A. Fuentes Summary To evaluate the level of accuracy of more than 500 measurement systems of liquid hydrocarbons in Colombia, a computer tool is currently used to calculate the uncertainty of measurement, applying the Guide to the Expression of Uncertainty...
Journal Articles
Journal: SPE Journal
SPE J. 26 (02): 940–958.
Paper Number: SPE-190269-PA
Published: 14 April 2021
.... Discontinuities in flux calculations caused by phase labeling problems not only cause serious convergence and stability problems but also affect the estimated recovery factor owing to incorrect phase mobilities. We developed a fully compositional simulation model using an equation of state (EoS) for relative...
Journal Articles
Journal: SPE Journal
SPE J. 26 (02): 918–939.
Paper Number: SPE-193879-PA
Published: 14 April 2021
... of the multiphysical THM processes are solved fully coupled on the same unstructured grid. To rigorously simulate the phase behavior of a three-phase, nonisothermal system, a three-phase flash-calculation module, dependent on the minimization of Gibbs energy, is implemented in the simulator. The simulator is thus...
Journal Articles
Journal: SPE Journal
SPE J. 26 (02): 765–779.
Paper Number: SPE-204469-PA
Published: 14 April 2021
.... Starting from a single type II kerogen macromolecule, several kerogen structures for a realistic range of porosity values were created and, subsequently, used for diffusivity calculations of methane molecules. Simulation results suggest a direct link between diffusion and kerogen porosity, allowing...
Journal Articles
Journal: SPE Journal
SPE J. 26 (02): 627–638.
Paper Number: SPE-201627-PA
Published: 14 April 2021
... calculation of the strain field. Because the finite element calculated strain is a tensor, it needs to be projected along the monitoring well trajectory to be comparable with the DAS strain, which is uniaxial. Moreover, the calculated strain field is transformed into a time domain using constant fracture...
Journal Articles
Journal: SPE Journal
SPE J. 26 (02): 883–896.
Paper Number: SPE-205026-PA
Published: 14 April 2021
... contact width distribution along with their length were extracted from a set of scanning electron microscope (SEM) images. The nanoscale aperture of grain contacts, which is below tomogram resolution, is accounted for in micro-CT-based numerical calculations by assigning effective porosity...
Journal Articles
Journal: SPE Journal
SPE J. 25 (06): 3332–3348.
Paper Number: SPE-202472-PA
Published: 17 December 2020
... 10 linear‐acceleration and Newton‐Raphson (NR)‐type algorithms. The initial equilibrium ratio for flash calculation is generated from reliable phase‐stability analysis (PSA). We propose a series of indicators to interpret the PSA results. Two new insights were obtained from the speed comparison among...
Journal Articles
Journal: SPE Journal
SPE J. 25 (06): 3412–3439.
Paper Number: SPE-201244-PA
Published: 17 December 2020
... of temperature dependency in different operational conditions. The results of the presented analytical model reveal that the oil rate can be calculated ignoring temperature dependency, suggesting thermal conductivity and specific heat calculated at a dimensionless temperature ratio between 0.75 to 0.8...
Includes: Supplementary Content
Journal Articles
Journal: SPE Journal
SPE J. 25 (04): 2000–2020.
Paper Number: SPE-195253-PA
Published: 13 August 2020
... sensitivities with respect to model properties. This calculation mimics the streamline‐derived analytical sensitivity computation used in the well‐established generalized travel‐time inversion (GTTI) technique but precludes explicit streamline tracing. The reservoir model property field is updated iteratively...
Journal Articles
Journal: SPE Journal
SPE J. 25 (04): 1557–1577.
Paper Number: SPE-180148-PA
Published: 13 August 2020
... formulation. We investigate the drainage‐volume evolution as a function of time in terms of the DTOF. The drainage volume might be directly related to the well‐test derivative, which can be used in an inversion calculation to calibrate reservoir model parameters. The analytic sensitivity coefficients...
Journal Articles
Journal: SPE Journal
SPE J. 25 (04): 1681–1696.
Paper Number: SPE-199360-PA
Published: 13 August 2020
...Haining Zhao; Zhengbao Fang Summary An improved algorithm for accelerating minimum miscibility pressure (MMP) computation using the multiple-mixing-cell (MMC) methods is presented. The MMC method is widely used to accurately calculate the MMP. In this study, we proposed an acceleration algorithm...
Journal Articles
Journal: SPE Journal
SPE J. 25 (04): 1636–1656.
Paper Number: SPE-201242-PA
Published: 13 August 2020
...‐data analysis. In any multiphase pseudopressure calculation, the determination of the saturation/pressure ( S o / p ) relationship plays a vital role because it directly influences the ability of multiphase RTA methods to reliably forecast original gas in place (OGIP). In this work, we present...

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