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


The Company's majority owned subsidiary, SOCO Vietnam Ltd., announces that the Voi Nau (VN-1X) well, the first well on Prospect "AA" in Block 16-1, will be plugged and abandoned after reaching a total depth of 3,130 metres. The well was drilled on a four way closure to evaluate the Oligocene section that was productive in Voi Trang. While the well encountered oil shows, the sands were poorly developed and had insufficient porosity to warrant testing.


Following this well, the rig will return to the Te Giac Den 1X ("TGD-1X") well on Prospect "E". As announced on 30 July 2007, the TGD-1X well encountered hydrocarbons in two Oligocene clastic sequences, which were separated by a volcanic layer. Well logs over the upper sequence indicated approximately 30 metres of net pay. After drilling through the volcanics, the well also encountered a deeper high pressure clastic sequence with oil and gas shows. A further 300 metres of sediment is interpreted above the Basement.

Although equipment is now assembled that would enable the section above the volcanics to be tested, detailed analysis of the well, including the benefit of drilling with the high pressure blow out preventer, testing multiple high pressure zones and the extent of the potential formation damage, has supported a decision to re-drill the entire section and conduct a single testing programme.

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

"We are particularly excited to return to the TGD structure. Success in the deeper objective section of this structure could totally transform this company and represent a significant milestone in the history of oil exploration in Vietnam. Accordingly, we are quite anxious to resume our evaluation now that we have assembled the proper high pressure drilling equipment.

31 October 2007


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 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), the Democratic Republic of Congo (Kinshasa) and Angola with production operations in Yemen.

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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