Kosmos Energy Announces Successful Completion of Tortue Drill Stem Test

DALLAS–(BUSINESS WIRE)–Kosmos
Energy (NYSE: KOS) announced today that it has successfully
completed the drill stem test (DST) of the Tortue-1 well, demonstrating
that the Tortue field is a world-class resource and confirming key
development parameters including well deliverability, reservoir
connectivity, and fluid composition.

The Tortue-1 well flowed at a sustained, equipment-constrained rate of
approximately 60 million cubic feet per day (MMcf/d) during the main,
extended flow period, with minimal pressure drawdown, providing
confidence in well designs that are each capable of producing
approximately 200 MMcf/d. The DST results confirmed a connected volume
per well consistent with the current development scheme, which together
with the high well rate is expected to result in a low number of
development wells compared to equivalent schemes. Initial analysis of
fluid samples collected during the test indicate Tortue gas is well
suited for liquefaction given low levels of liquids and minimal
impurities. Data acquired from the DST will be used to further optimize
field development and to refine process design parameters critical to
the front end engineering and design (FEED) process anticipated to begin
later this year.

“The positive results from the DST confirm that the Tortue field is a
world-class resource and validates the assumptions that underpin our
development concept,” said Andrew G. Inglis, chairman and chief
executive officer. “The combination of high well rates, large connected
volume per well together with a gas well-suited for liquefaction is why
we believe Tortue is one of the lowest cost pre-FID greenfield LNG
projects. The Kosmos BP partnership remains aligned on delivering a
final investment decision for the project in 2018 and first gas in 2021.”

The Tortue-1 well is located in water depths of approximately 2,700
meters offshore Mauritania. The DST was conducted by the Atwood
Achiever drillship, which has now mobilized to the Hippocampe
prospect in Block C-8 offshore Mauritania to begin exploration drilling
operations.

Kosmos is exploration operator of Block C-8 with a 28% participating
interest. BP is named operator with a 62% participating interest, and
Societe Mauritanienne des Hydrocarbures et de Patrimoine Minier
(“SMHPM”) has a 10% participating interest.

About Kosmos Energy

Kosmos is a leading independent oil and gas exploration and production
company focused on frontier and emerging areas along the Atlantic
Margin. Our assets include existing production and development projects
offshore Ghana, large discoveries offshore Mauritania and Senegal, as
well as exploration licenses with significant hydrocarbon potential
offshore Suriname, Sao Tome and Principe, Morocco and Western Sahara. As
an ethical and transparent company, Kosmos is committed to doing things
the right way. The Company’s Business
Principles articulate our commitment to transparency, ethics, human
rights, safety and the environment. Read more about this commitment in
the Kosmos 2016
Corporate Responsibility Report. Kosmos is listed on the New York
Stock Exchange and is traded under the ticker symbol KOS. For additional
information, visit www.kosmosenergy.com.

Forward-Looking Statements

This press release contains forward-looking statements within the
meaning of Section 27A of the Securities Act of 1933 and Section 21E of
the Securities Exchange Act of 1934. All statements, other than
statements of historical facts, included in this press release that
address activities, events or developments that Kosmos expects, believes
or anticipates will or may occur in the future are forward-looking
statements. Kosmos’ estimates and forward-looking statements are mainly
based on its current expectations and estimates of future events and
trends, which affect or may affect its businesses and operations.
Although Kosmos believes that these estimates and forward-looking
statements are based upon reasonable assumptions, they are subject to
several risks and uncertainties and are made in light of information
currently available to Kosmos. When used in this press release, the
words “anticipate,” “believe,” “intend,” “expect,” “plan,” “will” or
other similar words are intended to identify forward-looking statements.
Such statements are subject to a number of assumptions, risks and
uncertainties, many of which are beyond the control of Kosmos, which may
cause actual results to differ materially from those implied or
expressed by the forward-looking statements. Further information on such
assumptions, risks and uncertainties is available in Kosmos’ Securities
and Exchange Commission (“SEC”) filings. Kosmos undertakes no
obligation and does not intend to update or correct these
forward-looking statements to reflect events or circumstances occurring
after the date of this press release, except as required by applicable
law. You are cautioned not to place undue reliance on these
forward-looking statements, which speak only as of the date of this
press release. All forward-looking statements are qualified in their
entirety by this cautionary statement.

Contacts

Kosmos Energy
Investor Relations
Neal Shah,
+1-214-445-9628
[email protected]
or
Rhys
Williams, +1-214-445-9693
[email protected]
or
Media
Relations
Thomas Golembeski, +1-214-445-9674
[email protected]