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 continuing interests in Vietnam, Yemen, Mongolia, Libya and Thailand with ongoing production operations in Yemen and Mongolia. SOCO’s transaction to dispose of its Mongolian operations is pending completion after gaining approval from its shareholders at an EGM on 10 May 2005.

The Company's majority owned subsidiary, Comeco Petroleum, Inc. ("Comeco"), through which the Company holds a 16.785% net working interest in the East Shabwa Development Area in Yemen ("ESDA"), announces the successful production test of the KHA-405. The well was drilled as part of the continuing appraisal and development of the Basement reservoir in the Kharir Field.

The KHA-405 spudded on 28th March 2005 and reached a total depth of 3,755 metres. The objectives of the well were to delineate the Basement and evaluate reservoir development in the eastern extension of the structure as currently mapped. KHA-405 produced over 7,300 barrels of oil per day ("BOPD") when tested against a 58/64 inch choke. Production was limited by capacity limitations of the Kharir's main production facilities. This marks the fourth consecutive success of the five wells drilled thus far in the programme initiated in August 2004 to evaluate the Basement reservoir in the Kharir Field.

The sixth Basement well in the current ESDA drilling programme, the KHA-406, spudded on 11th June 2005 and is designed to be a water injection well.

Drilling of the KHA-405 is part of the consortium's three part programme for the year to appraise the Kharir Basement structure, increase reserves through exploration and increase production from the 29,000 BOPD level at the end of 2004.

Ed Story commented:

"The Basement potential in the Kharir Field in the East Shabwa Development Area in Yemen continues to grow. With this demonstrated success, the consortium now expects to test the exploration potential elsewhere on the Block and to increase its production and export capabilities"

28 June 2005


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

Pelham Public Relations
James Henderson Tel: 020 7743 6673
Charles Vivian Tel: 020 7743 6672

Notes to Editors

Comeco, in which SOCO holds a 58.75% interest, has a 28.57% interest in the ESDA in Block 10 in Yemen. The East Shabwa joint venture is operated by TOTAL E & P Yemen (28.57% interest) under a production sharing agreement with the government of Yemen. The other joint venture partners are Occidental Yemen Ltd. (28.57% interest) and Kuwait Foreign Petroleum Exploration Co. (14.29% interest).

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