Not long now5 Apr 2012 09:44
Petroleum Economist
• Posted Under: Company News
Apr 05
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Green Dragon rides China CBM wave
Independent cracks Chinese coal-bed methane challenge
Damon Evans, SINGAPORE: Green Dragon Gas is positioning itself to ride China’s unconventional wave after unlocking what it
claims are the secrets to success in the country’s fledgling coal-bed methane (CBM) sector.
Following several years developing techniques to overcome the challenges posed by Chinese CBM, the London-listed outfit is on
the cusp of being a leap forward in production. The Chinese-based independent expects to hit a production rate of 18 billion cubic feet per year (cf/y) by the end of 2013, up from 1.3 billion cff/y in 2011, as it ramps up its drilling campaign.
For the outfit, which has been operating in China since the 1990s and is the only company still active from the original wave of pioneers, time is a crucial function of its success.
The firm is no longer spending years developing technology, but is now deploying that technology more effectively. Gas production will improve as a results, Green Dragon chief executive Randeep S Grewal, told PEU.
And while the recent influx of new entrants has perked interest in China’s emerging CBM scene, Grewal offers would be explorers a word of caution. Geologically speaking, new explorers will have to go though several cycles of technical development, just like Green Dragon, before they can start significant gas production. Generic off the shelf approaches will not work in China as extraction techniques have to be tailored specifically to local conditions, Grewal reckons.
It’s the third time exploration companies have rushed into China’s CBM sector. This latest round has been spurred similarly by comparatively high gas prices, rising consumption and increasing transparency, all of which make for a unique environment that benefits the producer.
Cracking the code
Green Dragon bagged its first CBM contract in China in 1999 and snapped up average in the Qinshui basin in 2003. Whilst
hightly prospective with high gas content, the geology of the Qinshui basin initially posed challenges with its brittle, heavily faulted coal seams and low permeability coals. Faulted seams make it more difficult to drill horizontal sections that stay in-seam, low permeability implies lower gas productive capacity, while brittle coals tend to collapse and plug the well bore.
But, over the past eight years, Green Dragon has adapted its drilling ways to maximise production.
After attempting vertical drilling, short radius and multi-lateral horizontal drilling, the company achieved higher and more consistent recovery rates from surface to in-sean(SIS) wells. Green Dragon now uses this method. And, it has developed its own advanced proprietary drilling technology manufactured in Italy, coined LiFaBric (Lines, Faulted, Brittle coal wells)
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