OFFER TO PURCHASE FOR CASH
ALL OUTSTANDING SHARES OF COMMON STOCK
SUPERIOR WELL SERVICES, INC.
DIAMOND ACQUISITION CORP.
A WHOLLY OWNED SUBSIDIARY
NABORS INDUSTRIES LTD.
$22.12 NET PER SHARE
August 11, 2010
To Brokers, Dealers, Commercial Banks,
Trust Companies and Other Nominees:
We have been appointed by Diamond Acquisition Corp., a Delaware corporation (“ Offeror ”)
and wholly owned subsidiary of Nabors Industries Ltd., a Bermuda exempt company (“ Nabors
”), to act as Information Agent in connection with Offeror’s offer to purchase for cash all the
outstanding shares of common stock, par value $0.01 per share (the “ Shares ”), of Superior Well
Services, Inc., a Delaware corporation (“ Superior ”), at a purchase price of $22.12 per Share, net
to sellers in cash (such amount per Share paid pursuant to the Offer, the ‘‘ Offer Price ”), upon the
terms and subject to the conditions set forth in the Offer to Purchase, dated August 11, 2010 (the “
Offer to Purchase ”), and in the related Letter of Transmittal (which, together with the Offer to
Purchase and any amendments or supplements to the Offer to Purchase or to the Letter of
Transmittal, collectively constitute the “ Offer ”) enclosed herewith. Holders of Shares whose
certificates for such Shares (the “ Share Certificates ”) are not immediately available or who cannot
deliver their Share Certificates and all other required documents to the Depositary (as defined
below) on or prior to the Expiration Date (as defined in the Offer to Purchase), or who cannot
complete the procedure for book-entry transfer on a timely basis, must tender their Shares
according to the guaranteed delivery procedures set forth in Section 3 — “Procedures for
Accepting the Offer and Tendering Shares” of the Offer to Purchase.
Please furnish copies of the enclosed materials to those of your clients for whose accounts you
hold Shares registered in your name or in the name of your nominee.