Circle Oil Plc Regulatory News (COP)

29 October 2010

Circle Oil Plc

("Circle" or the "Company")

Drilling Update

Further gas discovery in well CGD-11, Sebou Permit, Rharb Basin, Morocco

Circle Oil Plc (AIM: COP), the international oil and gas exploration, development and production company, is pleased to announce that the CGD-11 exploration well has been drilled, logged and successfully tested in the Sebou Permit, Morocco.

The Company confirms a gas discovery in both the Main Guebbas target and the secondary Hoot zone. The well first tested gas at a sustained rate of 7.07 mmscf/d on a 30/64" choke from the Hoot. The perforated Hoot zone of 1,078.5m to 1,092m has a calculated net gas pay of 5.9m. The Main Guebbas gas zone was then perforated from 905m to 910m and has a calculated net gas pay of 4.2m. This interval tested at a sustained rate of 6.22 mmscf/d on a 30/64" choke. A thinner Upper Guebbas gas zone was also logged with 1m net gas pay and this zone will be tested at a later date. The well is being completed as a potential producer.

A full technical evaluation of all the results of the well is underway. This will allow for forward planning as a precursor to further assessment of the resource, including conducting an extended well test to give a more complete estimation of the reserves.

The drilling rig is now moving to commence drilling the third well, KSR-10, of the planned five well drilling program in the area. Following this, the DRJ-6 well from the previous drilling campaign will be tested and, weather permitting, the KAB-1 well will be re-entered for logging or re-drilling.

The Sebou permit lies to the north-east of Rabat in the Rharb Basin in Morocco. The Rharb Basin is a foredeep basin located in the external zone of the Rif Folded belt. The concession agreement, in which Circle has a 75% share and ONHYM, the Moroccan State oil company, has a 25% share, includes the right of conversion to a production licence of 25 years, plus extensions in the event of commercial discoveries.

Prof. Chris Green, CEO, said:

"I am pleased to report that we have continued our drilling success in the Rharb Basin and this well has tested with good sustained flow rates at both target levels. The well will now be completed and made ready for production".

Glossary

mmscf/d millions of standard cubic feet per day

OHNYM Office National des Hydrocarbures et des Mines

In accordance with the guidelines of the AIM Market of the London Stock Exchange, Professor Chris Green, Chief Executive Officer of Circle Oil Plc, an explorationist and geophysicist with over thirty years oil & gas industry experience, is a qualified person, as defined in the London Stock Exchange's Guidance Note for Mining and Oil and Gas companies, who has reviewed and approved the technical information contained in this announcement.

For further information contact: 

Circle Oil Plc (+44 20 7638 9571)Professor Chris Green, CEO

Evolution Securities (+44 20 7071 4300)Rob CollinsChris SimNeil Elliot

Fox-Davies Capital (+44 20 7936 5230)Daniel Fox-Davies

Philip Davies

David Porter

Citigate Dewe Rogerson (+44 20 7638 9571)Martin JacksonGeorge Cazenove

Murray Consultants (+353 1 498 0320)Joe MurrayJoe Heron

Notes to Editors

Circle Oil Plc (AIM: COP) is an international oil & gas exploration, development and production Company with an expanding portfolio of assets in Morocco, Tunisia, Oman and Egypt, with a combination of producing, low-risk near-term production and acreage with significant upside exploration potential. The Company listed on AIM in October 2004.

Internationally, the Company has continued to expand its portfolio over the past 2 years and now has assets in the Rharb Basin, Morocco; the Ras Marmour Permit in southern Tunisia; the Mahdia Permit offshore Tunisia; the Grombalia Permit in northern Tunisia; and the Zeit Bay area of Egypt. Circle also has the largest licence holding of any Company in Oman. In addition to offshore Block 52, the Company also has an ongoing exploration program in Block 49 onshore.

The Company's strategy is to locate and secure additional licences in prospective hydrocarbon provinces and through targeted investment programmes, monetise the value in those assets for the benefit of shareholders. Circle may use its own expertise to appraise reserves and bring assets into production, generating sustained cash flow for further investment. In addition it may seek farm-outs to selected partners who would then invest in the exploration and continue through to the development of the assets for production.

Further information on Circle is available on its website at www.circleoil.net.