CNOOC Limited - Exploration Progress Made in Bohai

              CNOOC Limited - Exploration Progress Made in Bohai

  PR Newswire

  HONG KONG, October 23, 2013

HONG KONG, October 23, 2013 /PRNewswire/ --

CNOOC Limited (the "Company", NYSE: CEO, SEHK: 00883, TSX: CNU) announced the
Company recently made a mid-sized new exploration discovery Luda 5-2 North and
successfully appraised the mid-sized oil and gas structure Kenli 9-5/9-6.

Luda 5-2 North is located in the Liaodong Bay of Bohai, with average water
depth of 31 meters. The discovery wells of Luda 5-2N-2 and LD 5-2N-4 were both
drilled and completed at a depth of around 1,140 meters and encountered the
oil pay zones with total thickness of about 120 meters and 85 meters,
respectively. The oil production of Luda 5-2N-2 well was tested at around
1,040 barrels per day. The new discovery of Luda 5-2 North demonstrates the
Company's successful experience in the thermal recovery technology of heavy
oil, and creates a new methodology to commercialize heavy oil reserves.

Kenli 9-5/9-6 is located in the Laixi structure in the southern part of Bohai,
with an average water depth of about 9 meters. The Company drilled Kenli
9-5-2D and Kenli 9-6-2 wells and completed at a depth of 2,200 meters and
1,250 meters, respectively. These two wells encountered oil pay zones with
total thickness of about 70 meters and 120 meters, respectively. During the
test period, the oil production of Kenli 9-6-2 well was around 200 barrels per
day. The successful appraisal of Kenli 9-5/9-6 has further expanded the scale
of the reserve in the area.

Notes to Editors:

More information about the Company is available at http://www.cnoocltd.com .

This press release includes "forward-looking statements" within the meaning of
the United States Private Securities Litigation Reform Act of 1995, including
statements regarding expected future events, business prospectus or financial
results. The words "expect", "anticipate", "continue", "estimate",
"objective", "ongoing", "may", "will", "project", "should", "believe",
"plans", "intends" and similar expressions are intended to identify such
forward-looking statements. These statements are based on assumptions and
analysis made by the Company in light of its experience and perception of
historical trends, current conditions and expected future developments, as
well as other factors that the Company believes reasonable under the
circumstances. However, whether actual results and developments will meet the
Company's expectations and predictions depends on a number of risks and
uncertainties which could cause the actual results, performance and financial
conditions to differ materially from the Company's expectations, including
those associated with fluctuations in crude oil and natural gas prices, the
exploration or development activities, the capital expenditure requirements,
the business strategy, whether the transactions entered into by the Company
can complete on schedule pursuant to its timetable or at all, the highly
competitive nature of the oil and natural gas industries, the foreign
operations, environmental liabilities and compliance requirements, and
economic and political conditions in the People's Republic of China. For a
description of these and other risks and uncertainties, please see the
documents the Company has filed from time to time with the United States
Securities and Exchange Commission, including 2012 Annual Report on Form 20-F
filed on April 24, 2013.

Consequently, all of the forward-looking statements made in this press release
are qualified by these cautionary statements. The Company cannot assure that
the results or developments anticipated will be realized or, even if
substantially realized, that they will have the expected effect on the
Company, its business or operations.

For further information:

Ms. Michelle Zhang Deputy Manager, Media / Public Relations CNOOC Limited Tel:
+86-10-8452-6642 Fax: +86-10-8452-1441 E-mail: MR@cnooc.com.cn

Ms. Angela Hui Ketchum Newscan Public Relations Ltd Tel: +852-3141-8091 Fax:
+852-2510-8199 E-mail: angela.hui@knprhk.com