Production profile characteristics of large dip angle coal reservoir and its impact on coalbed methane production: A case study on the Fukang west block, southern Junggar Basin, China

Kang, Junqiang; Fu, Xuehai; Lin, Guo; Liang, Shun

doi:10.1016/j.petrol.2018.07.044

Cited by 31 publications

(33 citation statements)

References 35 publications

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“…Total estimates of CBM resources in the world are more than 229 trillion m 3 , Figure 1. Characteristics of steeply-dipping coalbed methane (CBM) reservoirs, (a) location of the study area in China, (b) characteristics of the coal seams in the Badaowan Formation of the west Fukang Block [16], (c) a simplified geological model of a steeply-dipping CBM reservoir. Figure 1.…”

Section: Introductionmentioning

confidence: 99%

“…Prior studies of steeply-dipping UTCBM reservoirs ignoring stress effects have shown increased production from the shallow reservoir and the occurrence of dual peaks in maximum reservoir production, resulting from asynchronous drawdown profiles between shallow and deep [15,16]. This highlights the potential to select different well deployment selections to optimize the particular structural characteristics of these reservoirs [17].…”

Section: Introductionmentioning

confidence: 99%

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Evolution of Production and Transport Characteristics of Steeply-Dipping Ultra-Thick Coalbed Methane Reservoirs

et al. 2020

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The large spatial variability of in-situ stress and initial reservoir pressure in steeply-dipping ultra-thick coalbed methane (UTCBM) reservoirs exert strong control on the initial distribution of stress-sensitive permeability. This results in significant differences in the propagation of reservoir depressurization, gas production characteristics, distribution of fluid saturation, and evolution of permeability relative to flat-lying and thin counterpart coalbed methane (CBM) reservoirs. We contrast these responses using the Fukang mining area of the Junggar Basin, Xinjiang, China, as a type-example using coupled hydro-mechanical modeling. Production response indicates: (1) Dual peaks in CBM production rate, due to the asynchronous changes in the gas production rate in each the upper and lower sections of the reservoir; (2) higher depressurization and water saturation levels in the lower section of the reservoir relative to the upper at any given distance from the production well that ameliorate with time to be similar to those of standard horizontal reservoirs; (3) the heterogeneity in effective stress is further amplified by the asymmetry of the initial pressure drawdown distribution of the reservoir to exert extreme control on the down-dip evolution of absolute permeability—with implications for production. Field drainage data and simulation results obtained in this study more accurately reflect the drainage characteristics of the steeply-dipping UTCBM reservoirs. For ultra-thick low-rank coal seams, permeability anisotropy plays an important role in determining the utility of horizontal wells and hydraulic fracturing to maximize rates and yields CBM production, and requiring further study.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evolution of Production and Transport Characteristics of Steeply-Dipping Ultra-Thick Coalbed Methane Reservoirs

et al. 2020

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“…[56][57][58] In this work, the productivity of up-dip horizontal well and down-dip horizontal well was compared according to the actual production curve and we found that the up-dip horizontal well results in a better water drainage. For inclined coal reservoirs, due to the influence of gravity on water migration, the reservoir pressure of up-dip horizontal well and down-dip horizontal well will decrease asymmetrically, which will lead to different productivity.…”

Section: Branch Inclination and Directionmentioning

confidence: 99%

“…For inclined coal reservoirs, due to the influence of gravity on water migration, the reservoir pressure of up-dip horizontal well and down-dip horizontal well will decrease asymmetrically, which will lead to different productivity. [56][57][58] In this work, the productivity of up-dip horizontal well and down-dip horizontal well was compared according to the actual production curve and we found that the up-dip horizontal well results in a better water drainage. The up-dip well (Well 1-1) and down-dip well (Well 1-2) were drilled from the same drilling platform, with opposite drilling direction.…”

Section: Branch Inclination and Directionmentioning

confidence: 99%

“…A large number of previous studies have shown that the up-dip drilling direction in inclined coal seams makes the better gas and water production. For CBM development in inclined coal reservoir by vertical wells, Kang et al 58 found that CBM in inclined coal seams of Fukang west block can be desorbed early in the up-dip direction reservoir and the change rate of the gas content in the up-dip direction reservoir is greater than that in the down-dip direction reservoir. Based on the numerical simulation, Fu et al 56 believe that the pressure drop rate of the up-dip coals is greater than that of the down-dip coals, and thus, the gas content in the up-dip direction decreases faster than that of the down-dip direction.…”

Section: Branch Inclination and Directionmentioning

confidence: 99%

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Current status and key factors for coalbed methane development with multibranched horizontal wells in the southern Qinshui basin of China

Chen

Tang

Tao

et al. 2019

Energy Science & Engineering

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The Qinshui basin is the most successful area for coalbed methane (CBM) development in China. Since 2008, 45 multibranched horizontal wells (MBHWs) have been put into production in the Fanzhuang block, of which 10 wells have an average daily gas rate (DGR) of >10 000 m3/d. Well 4‐5 with the total gas production of 1.054 × 108 m3 achieved the China's highest DGR of 63 744 m3/d. Compared with vertical wells, MBHW is an effective way to develop CBM in low permeability reservoirs in China. However, there are still 23 wells have an average DGR of <3000 m3/d, of which 18 wells are below 1000 m3/d. The results show that shallow depth (<600 m), high gas content (>16 m3/t) and saturation (>80%), long coal seam interval (>3000 m), reasonable branch spread, and stable wellbore are the basis for achieving high production. The encountered faults connected to the aquifer will cause a high water production and an extremely low gas rate (<1000 m3/d). In the inclined coal seam, the up‐dip MBHW is more favorable for the formation water drainage and the pressure drop funnel expansion than the down‐dip MBHW, and the horizontal well should be drilled perpendicular to the high‐permeability direction to achieve a higher recovery ratio. MBHW is more sensitivity to drainage rate due to the coal fine migration in the horizontal segments, and the high pressure drop rate will lead to high frequency of stunk pump and eventually affect the gas production. Currently, the biggest challenge for CBM development with MBHW is wellbore stability. 57% of inefficient wells are caused by wellbore collapse during drilling and production processes. Here, a new type of “Roof Drilling‐Tree Shaped” horizontal well structure was presented in this work. The first “Roof Drilling‐Tree Shaped” horizontal well with a total length of 12 288 m and a coal seam interval of 9408 m was successfully applied without drilling accidents.

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Effects of structural fracture and in situ stress combination characteristics on the production of coalbed methane wells: A case in the Mabidong block, China

Zhou

Yang

et al. 2021

Energy Science & Engineering

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Production profile characteristics of large dip angle coal reservoir and its impact on coalbed methane production: A case study on the Fukang west block, southern Junggar Basin, China

Cited by 31 publications

References 35 publications

Evolution of Production and Transport Characteristics of Steeply-Dipping Ultra-Thick Coalbed Methane Reservoirs

Evolution of Production and Transport Characteristics of Steeply-Dipping Ultra-Thick Coalbed Methane Reservoirs

Current status and key factors for coalbed methane development with multibranched horizontal wells in the southern Qinshui basin of China

Effects of structural fracture and in situ stress combination characteristics on the production of coalbed methane wells: A case in the Mabidong block, China

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