Raniganj South producing 80 cubic metres per hour

Vol 10, PW 12 (05 Oct 06) Exploration & Production

Raniganj South promises to be a prolific CBM producer for Great Eastern Energy, which is also listed on the Alternative Investment Market of the London Stock Exchange.

Gas production at the block has shot up four times from the initial 20 cubic metres/hour (480 cm/d) to 80 cubic metres/hour (1900 cm/d). All this gas is now being flared, as commercial production has yet to start.

This gas, we hear, is being produced from two of the three wells initially drilled on the block. Industry sources tell this report that Great Eastern has installed progressive cavity pumps in these three wells to carry out dewatering operations.

Two of the wells are producing gas and one is producing water of around 200 b/d. On average, we understand, the wells that have been hydro-fractured are producing between 400 and 500 b/d water.

Another source tells us 12 of the 19 wells already drilled by the Mitchell rig have been hydro-fractured by BJ Services. The others will be hydro-fractured and dewatered in due course, we learn.

A geologist familiar with the block adds: There are 10 coal seams in the block. Great Easterns target seams are two: the upper and lower zones.

We are told that the upper zone lies at a depth of between 600 and 700 metres below ground while the lower zone is between 900 and 1100 metres below ground level. The upper zone, R9, has coal seams about four metres thick and a gas content of between 4 and 6 cubic metres/tonne.

The lower zone, R4, is believed to be more prospective as the coal seams are between three and four metres thick and the gas content between 8 and 10 cubic metres/tonne. Permeability, on an average, is about 10 millidarcies, we are told.