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 Clayton Williams Energy, Inc. CWEI ("Clayton Williams Energy") 
 today announced that it has established a record date of March 23, 2017, 
 and a meeting date of April 24, 2017, for a special meeting of its 
 stockholders. At the special meeting, which will be held at 10:00 a.m. 
 Central time at ClayDesta Conference Center, 6 Desta Drive, Suite 6550, 
 Midland, Texas 79705, Clayton Williams Energy stockholders will vote on 
 the previously announced proposed merger (the "Merger") of Clayton 
 Williams Energy and Noble Energy, Inc. NBL ("Noble Energy") 
 pursuant to the Agreement and Plan of Merger, dated as of January 13, 
 2017, by and among Clayton Williams Energy, Noble Energy, Wild West 
 Merger Sub, Inc. and NBL Permian LLC, and certain related matters.
 
 
 Clayton Williams Energy stockholders of record at the close of business 
 on March 23, 2017 will be entitled to receive notice of the special 
 meeting and to vote at the special meeting. Subject to satisfaction of 
 the remaining closing conditions, including receipt of Clayton Williams 
 Energy stockholder approval, the parties currently expect to complete 
 the Merger shortly following conclusion of the special meeting.
 
 
 About Clayton Williams Energy
 
 
 Clayton Williams Energy is an independent energy company located in 
 Midland, Texas. To learn more, please visit our website at <a xmlns="http://www.w3.org/1999/xhtml" href="http://cts.businesswire.com/ct/CT?id=smartlink&amp;url=http%3A%2F%2Fwww.claytonwilliams.com&amp;esheet=51525220&amp;newsitemid=20170313006442&amp;lan=en-US&amp;anchor=www.claytonwilliams.com&amp;index=1&amp;md5=ca28225e1b4eb48b31efde9b2c22994d" rel="nofollow" rel="nofollow">www.claytonwilliams.com</a>.
 
 
 Cautionary Statement Regarding Forward-Looking Statements
 
 
 This news release contains certain "forward-looking statements" 
 within the meaning of federal securities law. Words such as 
 "anticipates," "believes," "expects," "intends," "will," "should," 
 "may," "estimates," and similar expressions may be used to identify 
 forward-looking statements. Forward-looking statements are not 
 statements of historical fact and reflect Clayton Williams Energy&#39;s 
 current views about future events. They may include, but are not 
 limited to, the expected timing of completion of the Merger and other 
 statements that are not historical facts. No assurances can be 
 given that the forward-looking statements contained in this news release 
 will occur as projected and actual results may differ materially from 
 those projected. Forward-looking statements are based on current 
 expectations, estimates and assumptions that involve a number of risks 
 and uncertainties that could cause actual results to differ materially 
 from those projected. These risks and uncertainties include, 
 without limitation, the ability to obtain the requisite approval of the 
 Clayton Williams Energy stockholders, the risk that a condition to 
 closing of the proposed Merger may not be satisfied, the timing to 
 consummate the proposed Merger, the risk that the businesses will not be 
 integrated successfully, the risk that the cost savings and any other 
 synergies from the transaction may not be fully realized or may take 
 longer to realize than expected, disruption from the transaction making 
 it more difficult to maintain relationships with customers, employees or 
 suppliers, the diversion of management time on Merger-related issues, 
 the volatility in commodity prices for crude oil and natural gas, the 
 presence or recoverability of estimated reserves, the ability to replace 
 reserves, environmental risks, drilling and operating risks, exploration 
 and development risks, competition, government regulation or other 
 actions, the ability of management to execute its plans to meet its 
 goals and other risks inherent in Noble Energy's and Clayton Williams 
 Energy&#39;s businesses that are discussed in Noble Energy's and Clayton 
 Williams Energy&#39;s most recent annual reports on Form 10-K and in other 
 reports on file with the Securities and Exchange Commission ("SEC"). 
 Noble Energy&#39;s reports are also available from Noble Energy's offices or 
 website, <a xmlns="http://www.w3.org/1999/xhtml" href="http://cts.businesswire.com/ct/CT?id=smartlink&amp;url=http%3A%2F%2Fwww.nobleenergyinc.com&amp;esheet=51525220&amp;newsitemid=20170313006442&amp;lan=en-US&amp;anchor=http%3A%2F%2Fwww.nobleenergyinc.com&amp;index=2&amp;md5=878a9bf43db4752098d21a6c9db91ce7" rel="nofollow" rel="nofollow">http://www.nobleenergyinc.com</a>, 
 and Clayton Williams Energy&#39;s reports are also available from Clayton 
 Williams Energy&#39;s offices or website, <a xmlns="http://www.w3.org/1999/xhtml" href="http://cts.businesswire.com/ct/CT?id=smartlink&amp;url=http%3A%2F%2Fwww.claytonwilliams.com&amp;esheet=51525220&amp;newsitemid=20170313006442&amp;lan=en-US&amp;anchor=http%3A%2F%2Fwww.claytonwilliams.com&amp;index=3&amp;md5=40b5b76ced69bdc0c8f86b9392040c2d" rel="nofollow" rel="nofollow">http://www.claytonwilliams.com</a>. 
 Forward-looking statements are based on the estimates and opinions of 
 management at the time the statements are made. Clayton Williams 
 Energy does not assume any obligation to update forward-looking 
 statements should circumstances, management's estimates, or opinions 
 change.
 
 
 Additional Information And Where To Find It
 
 
 This communication does not constitute an offer to sell or the 
 solicitation of an offer to buy any securities or a solicitation of any 
 vote or approval. In connection with the proposed merger between 
 Noble Energy and Clayton Williams Energy, Noble Energy has filed with 
 the SEC a Registration Statement on Form S-4 including a preliminary 
 proxy statement of Clayton Williams Energy that also constitutes a 
 prospectus of Noble Energy. Clayton Williams Energy will mail the 
 proxy statement/prospectus to its stockholders. This document is 
 not a substitute for any prospectus, proxy statement or any other 
 document which Noble Energy or Clayton Williams Energy may file with the 
 SEC in connection with the proposed Merger. Noble Energy and 
 Clayton Williams Energy urge Clayton Williams Energy investors and 
 stockholders to read the proxy statement/prospectus regarding the 
 proposed Merger when it becomes available, as well as other documents 
 filed with the SEC, because they will contain important information. You 
 may obtain copies of all documents filed with the SEC regarding this 
 transaction, free of charge, at the SEC&#39;s website (<a xmlns="http://www.w3.org/1999/xhtml" href="http://cts.businesswire.com/ct/CT?id=smartlink&amp;url=http%3A%2F%2Fwww.sec.gov&amp;esheet=51525220&amp;newsitemid=20170313006442&amp;lan=en-US&amp;anchor=www.sec.gov&amp;index=4&amp;md5=98f33e07a01b1664ccdd2a22b5e2a3c1" rel="nofollow" rel="nofollow">www.sec.gov</a>). 
 You may also obtain these documents, free of charge, from Noble 
 Energy's website (<a xmlns="http://www.w3.org/1999/xhtml" href="http://cts.businesswire.com/ct/CT?id=smartlink&amp;url=http%3A%2F%2Fwww.nobleenergyinc.com&amp;esheet=51525220&amp;newsitemid=20170313006442&amp;lan=en-US&amp;anchor=www.nobleenergyinc.com&amp;index=5&amp;md5=c41b898cc1569808298d15326b019a05" rel="nofollow" rel="nofollow">www.nobleenergyinc.com</a>) 
 under the tab "Investors" and then under the heading "SEC Filings" and 
 from Clayton Williams Energy&#39;s website (<a xmlns="http://www.w3.org/1999/xhtml" href="http://cts.businesswire.com/ct/CT?id=smartlink&amp;url=http%3A%2F%2Fwww.claytonwilliams.com&amp;esheet=51525220&amp;newsitemid=20170313006442&amp;lan=en-US&amp;anchor=www.claytonwilliams.com&amp;index=6&amp;md5=42fe8df3c720f780961db4a043b6045a" rel="nofollow" rel="nofollow">www.claytonwilliams.com</a>) 
 under the tab &#34;Investors&#34; and then under the heading &#34;SEC Filings.&#34;
 
 
 Participants In The Merger Solicitation
 
 
 Noble Energy, Clayton Williams Energy, and their respective 
 directors, executive officers and certain other members of management 
 and employees may be soliciting proxies from Clayton Williams Energy 
 stockholders in favor of the Merger and related matters. Information 
 regarding the persons who may, under the rules of the SEC, be deemed 
 participants in the solicitation of Clayton Williams Energy stockholders 
 in connection with the proposed Merger are set forth in the preliminary 
 proxy statement/prospectus filed with the SEC and will be set forth in 
 the definitive proxy statement/prospectus when it is filed with the SEC. 
 You can find information about Noble Energy&#39;s executive officers and 
 directors in its definitive proxy statement filed with the SEC on March 
 11, 2016. You can find information about Clayton Williams 
 Energy&#39;s executive officers and directors in its definitive proxy 
 statement filed with the SEC on April 28, 2016. Additional 
 information about Noble Energy&#39;s executive officers and directors and 
 Clayton Williams Energy&#39;s executive officers and directors can be found 
 in the above-referenced preliminary proxy statement/prospectus and in 
 the definitive proxy statement/prospectus when it becomes available. You 
 can obtain free copies of these documents from Noble Energy and Clayton 
 Williams Energy using the contact information above.
 
 
 
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