Coastal Eng Regulatory News (CEO)

For immediate release                                                                                                                               23 February 2012

TSX: CEN                                                                                                                                       

AIM: CEO

Coastal Energy Announces Offshore Operations Update and Onshore Discovery

Coastal Energy Company (the "Company" or "Coastal Energy") (TSX: CEN, AIM: CEO), an independent exploration and production company with assets in Thailand, announces an update of its offshore operations and the successful discovery and production testing results from the sidetrack of the Dong Mun 3 onshore gas well and acquisition of increased working interest there.

Offshore

Coastal Energy has drilled two additional producing wells and one water injection well at Bua Ban North.  One of the producing wells was drilled horizontally, has been tied in and is currently producing.  The Company has two more wells to bring online at Bua Ban North.  Current offshore production is averaging 26,000 bopd, bringing total company production to 28,000 boepd.  The rig is now being mobilized to Bua Ban South and is expected to spud the first well there by the end of February.

Onshore

The sidetrack of the Dong Mun 3 well, located on Block L27/43 onshore Thailand, reached a total depth of 2,539 meters TVDSS.  The well encountered a vertical gas column of approximately 113 meters with porosity of up to 6 percent.  The well was flow tested for 24 hours and produced at an average rate of 15 mmcfd with flowing pressure of 1,950 psi through a 32/64" choke.  Further testing, appraisal and commercialization options for the Dong Mun are being reviewed by the partners.  APICO is a joint venture and the operator of the L27/43 concession.  Coastal currently owns 36.1% of APICO, making it the largest stakeholder in the joint venture. 

Coastal has entered into an agreement to acquire an additional 2.9% stake in APICO, which is currently held by a minority partner, for US$9.25 million in cash, bringing Coastal's interest in APICO to 39%.  This transaction is expected to close on or about February 23, 2012.  APICO also holds a 35% interest in the nearby Sinphuhorm Gas Field, thus increasing Coastal's net interest in the field to 13.65%.

Randy Bartley, President and CEO of Coastal Energy, commented:

"Our offshore operations continue to progress as planned.  The recent wells at Bua Ban North showed results consistent with our prognoses.  Most importantly, the horizontal well at Bua Ban North B is performing similarly to the horizontal well which was drilled at Bua Ban North A in 2011.  This further confirms our thesis that horizontal wells will be a significant tool in the development of this field.

"The test results of the Dong Mun 3 sidetrack are extremely encouraging. Testing is ongoing to determine the maximum deliverability of the well and evaluate additional stimulation, which could lead to a significant increase in flow rates.  The location of this sidetrack was determined using recently acquired 3D seismic.  The drilling results combined with the new 3D seismic strongly indicate that this gas structure has an areal extent of over 5,000 acres, giving this resource tremendous potential.  Now that the commercial viability of the field has been determined, we have begun the process of applying for a production license.

"We are also pleased with our acquisition of a further stake in APICO.  This transaction is accretive to our 1P and 2P NAVs using only Sinphuhorm valuations.  The discovery being announced today makes it an even more exciting transaction for us."

Particulars of the Transaction

Coastal acquired the additional 2.9% stake in APICO from Roil Production Thailand, LLC.  APICO holds a 35% working interest in the Sinphuhorm natural gas field onshore Thailand, as well as 100% working interests in concessions L27/43 and L15/43 onshore Thailand.  APICO had USD33.4MM of net income in 2010.

Randy Bartley, President and Chief Executive Officer of the Company and a member of the Society of Petroleum Engineering and Jerry Moon, Vice President, Technical & Business Development, a member of the American Association of Petroleum Geologists, a Certified Petroleum Geologist and a Licensed Professional Geoscientist in the state of Texas, have reviewed the contents of this announcement.

Additional information, including the Company's complete competent person's report may be found on the Company's website at www.CoastalEnergy.comor may be found in documents filed on SEDAR at www.sedar.com.

This statement contains 'forward-looking statements' as defined by the applicable securities legislation. Statements relating to current and future drilling results, existence and recoverability of potential hydrocarbon  reserves, production amounts or revenues, forward capital expenditures, operation costs, oil and gas price forecasts and similar matters are based on current data and information and should be viewed as forward-looking statements. Such statements are not guarantees of future results and are subject to risks and uncertainties beyond Coastal Energy's control. Actual results may differ substantially from the forward-looking statements.

Enquiries:

Coastal Energy Company

Email: investor@CoastalEnergy.com                                                                                                                                                       +1 (713) 877-6793

Strand Hanson Limited (Nominated Adviser)                                                                                                                                  +44 (0) 20 7409 3494

Rory Murphy                                          

Paul Cocker                                            

Macquarie Capital (Europe) Limited (Broker)                                                                                                                                +44 (0) 20 3037 2000

Paul Connolly

Jeffrey Auld

FirstEnergy Capital LLP(Broker)

Hugh Sanderson                                                                                                                                                                                   +44 (0) 20 7448 0200

Travis Inlow

Buchanan             

Tim Thompson                                                                                                                                                                                       +44 (0) 20 7466 5000

Ben Romney

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