Exploration of the induced fluid-disturbance effect in CBM co-production in a superimposed pressure system

Li, Qixian; Xu, Jiang; Shu, Longyong; Yan, Fazhi; Pang, Bo; Peng, Shoujian

doi:10.1016/j.energy.2022.126347

Cited by 5 publications

(2 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Compared to single-layer production, two production layers at different depths in coproduction wells have different pressures [24]. The fluids from the two layers entering the wellbore cause interlayer interference in the wellbore, which simultaneously affects the gas production capacity of the two production layers during coproduction [41]. Due to interlayer interference, the production capacity of some coproducing gas wells is even lower than that of single-layer production gas wells.…”

Section: Introductionmentioning

confidence: 99%

“…In the case of multilayer coproduction, the wellbore pressure varies at different depths (output pressure for each layer increases with depth). The production status of a single layer is influenced by the pressure at the depth of that layer in the wellbore [41]. Unlike the dry coal seams in the Alberta Basin and Surat-Bowen Basin, the CSG wells in the Ordos Basin and Eastern Yunnan and Western Guizhou Blocks in China have the problem of water production.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Zhu,

Qi,

et al. 2023

Energies

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%