Vertical borehole design and completion practices used to remove methane gas from mineable coalbeds

Lambert, S.W.; Trevits, Michael A.; Steidl, Peter F.

doi:10.2172/5329923

Cited by 12 publications

(4 citation statements)

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“…Most strikingly, these minethrough experiments not only show containment -i.e. arrest of growth in the vertical direction at the contact between the coal and the roof/floor rock, Figure 1a -but also they show deflection along the horizontal contacts especially when the bounding formation is stiffer and/or stronger than the coal, Figure 1b (Elder, 1977;Lambert et al, 1980;Diamond and Oyler, 1987;Jeffrey et al, 1992). Furthermore, these minethrough experiments enforce an appreciation of the complications associated with predicting hydraulic fracture growth in the presence of multiple layers.…”

Section: Field Evidencementioning

confidence: 86%

“…Furthermore, these minethrough experiments enforce an appreciation of the complications associated with predicting hydraulic fracture growth in the presence of multiple layers. For example, hydraulic fractures are observed to cross thin layers even if they are stiff/strong and they are observed to grow on top of the contact above a thin stiff layer that is separated from a thick stiff layer by a thin soft layer ( Figure 1c) (Lambert et al, 1980;Diamond and Oyler, 1987;Jeffrey et al, 1992Jeffrey et al, , 1995.…”

Section: Field Evidencementioning

confidence: 99%

“…van As and Jeffrey, 2000;Bunger et al, 2011) and coal (e.g. Elder, 1977;Lambert et al, 1980;Diamond and Oyler, 1987;Jeffrey et al, 1992Jeffrey et al, , 1995.…”

Section: Field Evidencementioning

confidence: 99%

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Four critical issues for successful hydraulic fracturing applications

Bunger¹,

Lecampion²

2024

Rock Mechanics and Engineering

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This paper reviews four critical mechanisms for successful applications of hydraulic fracturing that have emerged or grown in importance over the past 2 decades. These critical issues are managing height growth, decreasing near-wellbore tortuosity, predicting and engineering network versus localized growth geometry, and promoting simultaneous growth of multiple hydraulic fractures. Building on the foundation of decades of research relevant to each area but with an emphasis on advances within the past 20 years, the review presents available field evidence, laboratory data, and modeling insights that comprise the current state of knowledge. Fluid viscosity, injection rate, and in situ stresses are shown to appear as controlling parameters across all of these issues. The past contributions and limitations on future developments point to a future in which advances are enabled by a combination of fully coupled 3D simulations, advanced laboratory experiments, vastly expanded characterization capabilities, and order of magnitude improvements in monitoring resolution.

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Section: Field Evidencementioning

confidence: 86%

Section: Field Evidencementioning

confidence: 99%

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Four critical issues for successful hydraulic fracturing applications

Bunger¹,

Lecampion²

2024

Rock Mechanics and Engineering

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“…The project is a joint effort between U. S. Steel Corporation and the Department of Energy.Example SimulationStubbs, et a126 give a description of the pattern and operation. A more complete description of the completion and stimulation methods used in the pattern are given by Lambert, et a1 27. The pattern, drilled into the same coalbed being mined is far enough away from the mine to be at least five years in advance of mining…”

mentioning

confidence: 99%

Analysis of the Coalbed Degasification Process at a Seventeen Well Pattern in the Warrior Basin of Alabama

Ancell¹,

Lambert²,

Johnson³

1980

Proceedings of SPE Unconventional Gas Recovery Symposium

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This paper presents an analysis of the coalbed degasification process. The theoretical and experimental basis of the degasification process are discussed and a simulation model which incorporates all aspects of this process is described. The simulator is demonstrated using actual field data developed by a joint industry/government demonstration project funded by the DOE and U. S. Steel. The basic reservoir description is discussed in detail, including variations of important description parameters with location.Initial and boundary conditions are demonstrated and analyzed. Initially, the coalbed was saturated with water. With water production, reservoir pressure is lowered, causing gas to desorb from the coal creating a mobile gas saturation. Subsequently, interwell interference effects are demonstrated and the need for such effects explained.Finally, the long term gas deliverability of the pattern is forecast. This forecast shows that about 45% of the gas within the pattern can be removed if the pattern is in operation six years ahead of mining.

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