Sources and concentrations of methane, ethane, and CO2 in deep aquifers of the Surat Basin, Great Artesian Basin

Pearce, Jon; Hofmann, Harald; Baublys, K. A.; Golding, S. D.; Rodger, Iain; Hayes, Philip J.

doi:10.1016/j.coal.2022.104162

Cited by 8 publications

(1 citation statement)

References 82 publications

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“…Areas of vertical distribution with multiple potential production layers are currently discovered in the Ordos Basin, Qinshui Basin, Eastern Yunnan and western Guizhou in China [4][5][6][7][8]. Similar areas are also found in the United States, Australia and Canada, such as the San Juan Basin [9,10], Black Warrior Basin [11,12], Powder River Basin [13,14], Horseshoe Canyon Basin [15,16], and Bowen-Surat Basin [17,18].…”

Section: Introductionmentioning

confidence: 96%

A Wellbore Pressure Control Method for Two-Layer Coal Seam Gas Coproduction Wells

Zhu,

Qi,

et al. 2023

Energies

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In coal seam gas (CSG) coproduction wells, due to the different production pressures of CSG production layer at different depths, the interlayer interference in wellbore seriously affects the gas production of a coproduction well. To effectively suppress the interlayer interference of the wellbore, a wellbore pressure distribution method for a two-layer coproduction well is proposed. Based on the analysis of the factors influencing the flow pressure distribution in the wellbore of two-layer coproduction wells, a method of coproduction flow pressure adjustment by regulating the wellhead pressure and the depth of the dynamic fluid level was established in this paper. The results show that wellhead pressure can directly affect the production pressure of two layers. The variation in layer 1 output mainly affects the pressure difference between the wellhead pressure and the pressure at the depth of layer 1, which has little effect on the pressure difference between layer 1 and 2. An increase in gas production from layer 2 would not only cause a pressure increase in layer 1, but also result in a reduction of the production pressure at layer 2. The maximum pressure gradient of the gas section is 0.14 MPa/100 m, and the pressure gradient of the gas–liquid section is 0.53–1.0 MPa/100 m.

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