SOCO International plc ("SOCO" or "the Company")

SOCO is an international oil and gas exploration and production company, headquartered in London, traded on the London Stock Exchange and a constituent of the FTSE 250 Index. The Company has interests in Vietnam, Yemen, Thailand, the Republic of Congo (Brazzaville) and the Democratic Republic of Congo (Kinshasa) with production operations in Yemen.

Following the release of preliminary test results on the fifth appraisal well, the TGT-5X on the Te Giac Trang ("TGT") structure on Block 16-1 offshore Vietnam on Thursday of last week, the well was shut in for pressure build up and final tests on the Miocene Lower Bach Ho 5.2 pay zone ("LBH 5.2") over the weekend. With testing now complete, TGT-5X had a total combined maximum flow rate of approximately 16,430 barrels of oil equivalent per day ("BOEPD") from the LBH 5.2 and Oligocene "C" intervals.

The first drill stem test over the 32 metre Oligocene "C" interval tested water-free at a maximum rate of 7,098 barrels of oil per day ("BOPD") of 36.5 degree API gravity crude and approximately 2.07 million cubic feet of gas per day ("MMCFD") through an 80/64 inch choke size. The most prolific interval in the other successful wells drilled on TGT, the LBH 5.2 pay zone, was perforated and tested separately between 2,841 and 2,866 metres with a maximum flow rate of 8,987 BOEPD comprising 8,104 BOPD of 41 degree API gravity crude and approximately 5.3 MMCFD through a 80/64 inch choke size.

The TGT-5X was the initial well drilled on the "H2" fault block just south of the initial discovery on the "H1" fault block. The southern most fault block in the five fault block structure remains to be drilled. The LBH 5.2 and Oligocene "C" reservoirs encountered in the TGT-5X well appear to be the same as those tested in the previous TGT wells. With an 80% drilling success rate on the TGT structure and tests ranging from approximately 9,000 BOEPD to approximately 17,500 BOEPD, activities are now focussed on early approval for development of the field.

The well will be suspended as a future producer and the rig moved immediately to drill a Miocene/Oligocene exploration well in Block 9-2 on the COD structure.

Ed Story, President and Chief Executive of SOCO, commented:

"With the prolific wells and an 80% drilling success rate, there is no question that we have a major accumulation on the TGT structure. The Oligocene test, the most prolific to date, is an added bonus supporting the potential in TGT and reducing exploration risk along the Block 16-1 fairway. We are already progressing through the Government of Vietnam's technical process to apply for commerciality on this structure in the near future."

18 December 2006


SOCO International plc
Roger Cagle
Deputy Chief Executive and Chief Financial Officer
Tel: 020 7747 2000

Pelham Public Relations
James Henderson, tel: 020 7743 6673
Alisdair Haythornthwaite, tel: 020 7743 6676


SOCO holds its interests in Vietnam, all in the Cuu Long Basin offshore, through its 80% owned subsidiary SOCO Vietnam Limited (SOCO Vietnam) and through its 100% ownership of OPECO, Inc.. SOCO Vietnam holds a 25% working interest in Block 9-2, which is operated by the Hoan Vu Joint Operating Company ("HVJOC")and holds a 28.5% working interest in Block 16-1, which is operated by the Hoang Long Joint Operating Company ("HLJOC"). OPECO, Inc. holds a 2% interest in Block 16-1.

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