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Journal Article 2

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2012 2

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CO₂ injection 1

Qingshui Basin 1

Shanxi 1

coal bed methane 1

coalbed methane 1

fracture 1

hydraulic fracturing 1

recovery ratio 1

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injecting and burying CO₂ for 3# coal seam of north section of Shizhuang, Qingshui Basin, Shanxi

Ye Jianping,Zhang Bing,Sam Wong

Strategic Study of CAE 2012, Volume 14, Issue 2, Pages 38-44

Abstract:

By conducting geological and engineering evaluation on deep coalbed methane injection in North Section, Shizhuang, South Qingshui Basin, methane extraction technology by deep coalbed injection of CO2 is thought applicable for north block, Shizhuang. By miniature and pilot test for SX-001 well, change rules of gas production, water production, gas composition and well bottom pressure of the SX-001 well before and after injection are summarized. The gas production after injection is 2.45 times of that before injection as shown by on-site test. Under pressure lower than rupturing pressure for coal seam, 20 of CO2 can be injected smoothly daily with slow elevation of pressure. After injection of CO2, the coal rock swells and the local coal seam get less penetration ratio, which recovers after extraction for a period of time. The total replacement ratio of hydrocarbon gas reaches 14.18 cm3/g within the scope influenced by CO2 injection in the target coal seam. The test result proves that extraction of coalbed methane by CO2 injection can realize burial of CO2 and elevation of recovery ratio for the coalbed methane well.

Keywords： Qingshui Basin Shanxi CO₂ injection coalbed methane recovery ratio

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Horizontal effects in fracturing operation of coal bed methane in Qinshui,Shanxi Province

Li Mengxi,Zhang Cong

Strategic Study of CAE 2012, Volume 14, Issue 4, Pages 16-19

Abstract:

This paper describes horizontal effects of CBM (coal bed methane)fracturing, obtained from microseismic monitoring in Qinshui Basin. It indicates that adjacent wells perpendicular to man-made fractures have adverse effects, including reduced production flow rate, depletion, and watering during fracturing operation simultaneously, while wells along manmade fractures response lag. This discovery shows that the horizontal compression of fracturing could have adverse impact on production of adjacent wells, and fracturing designer should be aware of it.

Keywords： coal bed methane fracture hydraulic fracturing