Advanced Well Simulation in a Multilayered Reservoir

Verga, Francesca; Griffa, G.; Aldegheri, A.

doi:10.2523/68821-ms

Cited by 1 publication

(2 citation statements)

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“…It has two major types: Type I, the horizontal well is treated as the main well and the sub-branches are all in the same gas-containing reservoir; 54 and Type II, the vertical well is treated as the main well and the sub-branches are in the different strata. 55 In this section, the impacts of a multiple branch well of Type I are investigated. Scenario I (horizontal well in the coal seam) is used as the benchmark model, and three sub-cases are specified to investigate the effect of a multiple branch well (Type I) with the main well length of 80 m and each branch length of 40 m. Cases A ∼ C represent one ∼ three multiple branches, with each branch uniformly distributed and the angle between the main well and branch well is 90°.…”

Section: Resultsmentioning

confidence: 99%

“…A multiple branch well is usually referred to the one or multiple wellbores made by sidetracking at different locations. It has two major types: Type I, the horizontal well is treated as the main well and the sub-branches are all in the same gas-containing reservoir; and Type II, the vertical well is treated as the main well and the sub-branches are in the different strata . In this section, the impacts of a multiple branch well of Type I are investigated.…”

Section: Resultsmentioning

confidence: 99%

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Influence of Well Types on Optimizing the Co-production of Gas from Coal and Tight Formations

et al. 2022

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Co-production of gas from both coalbeds and tight formations is considered a viable means to improve well productivity. Most previous studies focused on the geology and resource estimates for gas production viability with little attention to the effectiveness of gas co-production with regard to well types. To make up for this weakness, a two-phase flow and reservoir deformation coupled model is proposed together with an anisotropic permeability model. The coupled model is first verified using gas and water production data from a vertical well from the Linxing block in the Ordos Basin, China. Then a reservoir model is built, including one coal seam and one tight gas formation separated by a low-permeability stratum with four simulation scenarios designed. Based on the results, the impacts of the crossflow between different reservoirs are addressed and the mechanisms of the gas co-production rate profile types observed in the Linxing block are analyzed. It is also found that high water-saturated adjacent reservoirs would keep the water relative permeability of the gas-rich reservoir at a high level, impeding the gas flow. The use of a horizontal well is strongly recommended when most gases are stored in a specific thin reservoir and the life of the well is short; however, a vertical well is favored when two or more gas-rich and high permeability reservoirs co-exist and the well life is relatively long. For the application of vertical wells, the hydraulic fractures should extend in the horizontal planes and interact with the pre-existing natural fracture. For horizontal wells, the hydraulic fracture should extend in the host reservoir and penetrate into the adjacent strata. This work can shed new light on the co-exploitation of coal measure methane.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%