SPE Annual Technical Conference and Exhibition 2003
DOI: 10.2118/84122-ms
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Improvement Processes for Coalbed Natural Gas Completion and Stimulation

Abstract: TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractDrilling activity to access natural gas production from

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Cited by 36 publications
(11 citation statements)
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“…It is worth noting that the δ 13 C 1 value of biogenic gas produced by CO 2 reduction is related to the δ 13 C 1 value of the CO 2 matrix and formation water. Compared to biogenic gas, thermogenic gas demonstrates the following characteristics: (1) heavy hydrocarbons are generally found in high/medium volatile bituminous coals and other 3 Geofluids higher-rank coals; (2) the 12 C- 12 C bond in the gas molecule breaks more frequently than the 12 C- 13 C bond as the degree of coalification increases, which causes the enrichment of heavy isotope 13 C in CH 4 and C 2 H 6 during the generation of thermogenic gas; and (3) thermogenic gas is comparatively rich in deuterium with the increase of coalification [31]. 1, the occurrence of CBM in coal reservoirs is mainly comprised of the free state, the adsorbed state, and the water-soluble state [26].…”
Section: Basic Characteristics Of Fluids In Coal Reservoirsmentioning
confidence: 99%
See 1 more Smart Citation
“…It is worth noting that the δ 13 C 1 value of biogenic gas produced by CO 2 reduction is related to the δ 13 C 1 value of the CO 2 matrix and formation water. Compared to biogenic gas, thermogenic gas demonstrates the following characteristics: (1) heavy hydrocarbons are generally found in high/medium volatile bituminous coals and other 3 Geofluids higher-rank coals; (2) the 12 C- 12 C bond in the gas molecule breaks more frequently than the 12 C- 13 C bond as the degree of coalification increases, which causes the enrichment of heavy isotope 13 C in CH 4 and C 2 H 6 during the generation of thermogenic gas; and (3) thermogenic gas is comparatively rich in deuterium with the increase of coalification [31]. 1, the occurrence of CBM in coal reservoirs is mainly comprised of the free state, the adsorbed state, and the water-soluble state [26].…”
Section: Basic Characteristics Of Fluids In Coal Reservoirsmentioning
confidence: 99%
“…Coal is one of the most widely available energy sources with a huge world consumption, which is formed from the remains of ancient organisms through deep burial and coalification under the conditions of incredible heat and pressure (Figure 1(a)) [1][2][3]. It is estimated that the global methane reserves in coal seams can be up to 269 × 10 12 m 3 , which constrains production safety in coal mines and contributes significantly to greenhouse gas emissions [4]. From the last century, United States, Canada, and Australia have carried out extensive exploration and commercial exploitation of the CBM resource in multiple coal-bearing basins, such as San Juan Basin, Black Warrior Basin, Bowen Basin, and Surat Basin [5][6][7][8][9].…”
Section: Introductionmentioning
confidence: 99%
“…To increase methane gas production at CBM play, there are 2 common methods which are (Fekete, 2010;Holdicth, 1993;Olsen, 2003;Leschyshyn, 2005):…”
Section: Cbm Production Mechanismsmentioning
confidence: 99%
“…Barrier treatments are smaller, more precise and designed to maximise damage over a smaller created fracture area (e.g., an efficient fracture for production, Figures 15a and 15b, as opposed to more effective fracturing for barrier placement, Figures 15c and 15d) (Olsen et al, 2003); thus, more detail is required to design, execute, evaluate, and verify a barrier placement than a production well fracturing treatment.…”
Section: Summary Of Design and Workflows For Barrier Placementmentioning
confidence: 99%
“…(a) Efficient production well frac in low permeability, low anisotropy coal interval; this would be non-ideal for barrier placement (b) Efficient production well frac in high permeability, high anisotropy coal interval; this would be non-ideal for barrier placement (c) Moderately inefficient production well frac in low to moderate permeability, low to moderate anisotropy coal interval; this is more effective for barrier placement (d) Highly inefficient production well frac in moderate to high permeability, moderate to low anisotropy coal interval but ideal for barrier placement Figure 15: Models depicting efficient and inefficient hydraulic fractures for production contrasting inefficient and efficient fracturing for barrier placement (after Olsen et al, 2003) 56 …”
Section: Summary Of Design and Workflows For Barrier Placementmentioning
confidence: 99%