Gran Tierra Energy to Complete Costayaco-7 as Water Injector



    Pipeline Repairs to Trans Andean Pipeline Continuing

    CALGARY, Aug. 5 /CNW/ - Gran Tierra Energy Inc. (NYSE Amex:   GTE, TSX:
GTE), a company focused on oil exploration and production in South America,
today announced that testing of Costayaco-7 has been completed. In addition,
production operations are continuing at a reduced level while repairs continue
with the Ecopetrol-operated Trans Andean Pipeline west of Orito.

    Costayaco-7

    The Costayaco-7 well is located at the northern end of the Costayaco
Field in the Chaza Block, Putumayo Basin of southern Colombia. Following the
well's initial results, further testing demonstrated that only formation
water, and no oil, was present in the top of the Villeta T Reservoir where
well logs and pressure data had indicated a potential thin oil column. This
well will now be completed as a water injector to dispose of produced water
from the Costayaco field, and to provide pressure support for the Villeta T
reservoir.

    Production Operations

    Repairs on the Ecopetrol-operated Trans Andean Pipeline west of Orito are
continuing. Since the pipeline was shut in on July 10, Gran Tierra Energy has
produced crude at a reduced level of approximately 6,000 barrels of oil per
day (BOPD) net after royalty in Colombia using available trucking capacity.
The company expects to continue producing at approximately these levels until
repairs are completed.
    Argentina production has been averaging approximately 860 BOPD net after
royalty during this period. Production in Argentina has since risen to
approximately 1,200 BOPD net after royalty following recent completion of well
workover activity.
    "We expect to be able to return to normal production levels immediately
following the completion of repairs," said Dana Coffield, President and Chief
Executive Officer of Gran Tierra Energy. "Production from the recently drilled
Costayaco-8, with a production capacity of 3,500-4,500 BOPD, is ready to be
tied in, and drilling operations at Costayaco-9 are proceeding normally with
completion expected in late August."

    About Gran Tierra Energy Inc.

    Gran Tierra Energy Inc. is an international oil and gas exploration and
production company, headquartered in Calgary, Canada, incorporated in the
United States, trading on the NYSE Amex Exchange (GTE) and the Toronto Stock
Exchange (GTE), and operating in South America. Gran Tierra Energy holds
interests in producing and prospective properties in Argentina, Colombia and
Peru. Gran Tierra Energy has a strategy that focuses on establishing a
portfolio of producing properties, plus production enhancement and exploration
opportunities to provide a base for future growth. Additional information
concerning Gran Tierra Energy is available at www.grantierra.com.

    Forward Looking Statements:

    The statements in this news release regarding Gran Tierra Energy's
expectations that Gran Tierra will continue producing at reduced levels of
approximately 6,000 BOPD net after royalty in Colombia utilizing trucking
capacity until repairs are completed, that production will resume immediately
following the completion of repairs, and that drilling operations at
Costayaco-9 will be completed in late August, are forward looking statements
or financial outlook ("forward-looking statements") under the meaning of
applicable securities laws, including Canadian Securities Administrators'
National Instrument 51-102 Continuous Disclosure Obligations and the United
States Private Securities Litigation Reform Act of 1995. These statements are
subject to risks, uncertainties and other factors that could cause actual
results or outcomes to differ materially from those contemplated by the
forward-looking statements. There are a number of important factors that could
cause the results or outcomes discussed herein to differ materially from that
indicated by the forward-looking statements, including, among others: Gran
Tierra Energy's operations are located in South America, and unexpected
problems can arise due to guerilla activity, technical difficulties and
operational difficulties which impact its testing and drilling operations and
the production, transport or sale of its products; geographic, political and
weather conditions can impact testing and drilling operations and the
production, transport or sale of its products; trucking capacity may not be
sustainable at the expected capacity due to unforeseen reasons,; and the risk
that recent disruptions will continue longer than expected. Further
information on potential factors that could affect Gran Tierra Energy are
included in risks detailed from time to time in Gran Tierra Energy's
Securities and Exchange Commission filings, including, without limitation,
under the caption "Risk Factors" in Gran Tierra Energy's Quarterly Report on
Form 10-Q filed May 8, 2009. These filings are available on a Web site
maintained by the Securities and Exchange Commission at http://www.sec.gov and
on SEDAR at www.sedar.com. The forward-looking statements contained herein are
expressly qualified in their entirety by this cautionary statement. The
forward-looking statements included in this document are made as of the date
of this document and Gran Tierra Energy disclaims any intention or obligation
to update or revise any forward-looking statements, whether as a result of new
information, future events or otherwise, except as expressly required by
applicable securities legislation.





For further information:

For further information: For media and investor inquiries please contact
Thomas McMillan, Equicom Group, (866) 973-4873, (403) 536-5903,
info@grantierra.com

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Gran Tierra Energy Inc.

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