Ensco plc 22 July 2011 Monthly Changes Bolded rig names and underlined text signify changes in rig status from previous report. Segment / Region / Rig Design Water Depth' (1) Customer/ Status Day Rate $000's US Location Est. Avail / Contract Change Comments Deepwater ENSCO DS-3 (3) Drillship, DP3 Samsung 10000/12000 BP High 480s U.S. Gulf of Mexico Jun. 16 Full day rate, high 480s, and 5-year term contract began 1 Jun. 11. See footnote 3 regarding change in day rate from prior report ENSCO DS-5 Drillship, DP3 Samsung 10000/12000 Mid 430s U.S. Gulf of Mexico Jul. 16 Full day rate, mid 430s, and 5-year term contract began 11 Jul. 11. Eligible for bonus opportunity up to 17%, plus ENSCO 8500 Semisubmersible DP 8500/10000 Eni/Anadarko Mid 290s U.S. Gulf of Mexico Aug. 13 Lump sum payment of $20 million and one-time reimbursable costs of $27 million amortized over primary contract term, which equals approx. $31,000 per day. Plus cost adjustments and four 1-year same-rate options ENSCO 8501 Semisubmersible DP 8500/10000 Nexen/Noble Energy Mid 370s U.S. Gulf of Mexico Jun. 13 Currently allocated to Noble. For Nexen's allocation of rig time, see U.S. Gulf of Mexico on Definitions and Disclaimers page. Mob and upgrade costs are reimbursed by Noble and Nexen at approx. $19,000 per day over primary contract term. Plus cost adjustments and unpriced options ENSCO 8502 Semisubmersible DP 8500/10000 Nexen High 480s U.S. Gulf of Mexico Jun. 13 Full day rate, high 480s, and 2-year term contract began 20 Jun. 11. Plus approx. $35,000 per day for reimbursable mobilization expenses and upgrades amortized over 2-year term contract ENSCO 8503 (2) Semisubmersible DP 8500/10000 Tullow/Cobalt High 430s French Guiana Sep. 11 rate of low 210s for upgrades. Then expect to commence original 2-year term contract with Cobalt in U.S. Gulf of Mexico, low 530s, plus reimbursable expenses and upgrades to be amortized over Cobalt's primary contract term of approx. $54,000 per day once term contract commences ENSCO DS-4 (3) Drillship, DP3 Samsung 10000/12000 BP Mid 540s Brazil Jul. 16 Full day rate, mid 540s, began 21 May and 5-year term contract began 17 Jul. 2011. See footnote 3 regarding change in day rate from prior report ENSCO 7500 Semisubmersible DP 8000 Contracted/mob/sea trials Brazil Oct. 11 be amortized over contract at approx. $20,000 per day ENSCO 6001 Semisubmersible - 5000/5600 Mid 270s Brazil Jun. 13 Eligible for bonus opportunity up to 15%, plus cost adjustments ENSCO 6002 Semisubmersible - 5600 Mid 270s Brazil Jul. 13 Eligible for bonus opportunity up to 15%, plus cost adjustments ENSCO 6003 Semisubmersible - 5600/5700 High 310s Brazil Jan. 17 Estimate 42 days shipyard in 3Q 2011 at zero rate. Eligible for bonus opportunity up to 15%, plus cost adjustments ENSCO 6004 Semisubmersible - 5700 High 310s Brazil Oct. 16 Eligible for bonus opportunity up to 15%, plus cost adjustments ENSCO 5006 Semisubmersible - Conv Bingo 8,000 6200/7500 Noble Energy Mid 270s Israel Oct. 11 Plus cost adjustments and five 1-well options ENSCO DS-1 Drillship - DP Gusto 10,000 6000/10000 TOTAL Mid 190s Angola Dec. 14 Rate increases mid Dec. 11, low 350s. Anticipate two months planned downtime at zero rate in 2012. Plus options and cost adjustments. Eligible for bonus opportunity up to 7% to Dec. 11 and thereafter up to 5% ENSCO DS-2 Drillship - DP Gusto 10,000 6000/10000 TOTAL Mid 460s Angola Jul. 13 Eligible for bonus opportunity up to 5%, plus cost adjustments ENSCO 5001 Semisubmersible - Conv Sonat Offshore/Aker 5000/6500 Shipyard ---------- Angola Sep. 11 Mar. 14, mid 270s. Plus two 1-well options, low 320s North & South America (excluding Brazil) - See Definitions and Disclaimers Brazil Middle East & Africa Europe & Mediterranean Page 1 of 6 Ensco plc 22 July 2011 Monthly Changes Bolded rig names and underlined text signify changes in rig status from previous report. Segment / Region / Rig Design Water Depth' (1) Customer/ Status Day Rate $000's US Location Est. Avail / Contract Change Comments Deepwater ENSCO 8504 Semisubmersible DP 8500/10000 Under construction/ contracted/sea trails Singapore/ Brunei 3Q11 Next to TOTAL to Mar. 12, mid 420s. Plus options. Mob and upgrade costs to be amortized over contract at approx. ENSCO DS-6 Drillship, DP3 Samsung 10000/12000 Under construction South Korea 4Q11 ENSCO DS-7 Drillship, DP3 Samsung 10000/12000 Under construction South Korea 2H13 ENSCO 8505 Semisubmersible DP 8500/10000 Under construction Singapore 1H12 ENSCO 8506 Semisubmersible DP 8500/10000 Under construction Singapore 2H12 (1) For rigs that may be modified to drill in deeper water depths, both the currently outfitted and maximum upgrade capabilities are shown. Under Construction - uncontracted (3) On 31 May 2011, Ensco completed the acquisition of Pride International. On Pride’s previous fleet status reports, day rates reported for two rigs, ENSCO DS-3 (Deep Ocean Ascension) and ENSCO DS-4 (Deep Ocean Clarion), included reimbursable items related to mobilizations and capital enhancements that were being invoiced monthly. Non-recurring reimbursable items related to mobilizations and capital enhancements for all other Pride rigs were excluded from the reported day rates on Pride’s fleet status reports. Ensco excludes non-recurring reimbursable items related to mobilizations and capital enhancements from its day rate definition regardless of how these amounts are invoiced or paid. performed by Pride prior to the acquisition. Therefore, the reported day rate for ENSCO DS-3 was reduced from low 540s to high 480’s and the reported day rate for ENSCO DS-4 was reduced from high 590s to mid 540s to exclude these items. Importantly, the amount of expected cash flows for these contracts remain unchanged. Asia & Pacific Rim (2) Page 2 of 6 Ensco plc 22 July 2011 Segment / Region / Rig Design Water Depth' (1) Customer/ Status Day Rate $000's US Location Est. Avail / Contract Change Comments Midwater ENSCO 5000 Semisubmersible - Conv Neptune Pentagon 2300/2650 Low 240s Brazil Jul. 13 Eligible for bonus opportunity up to 15%, plus cost adjustments ENSCO 5002 Semisubmersible - Conv Aker H-3 1000 OGX Mid 330s Brazil Nov. 11 While the ENSCO 5004 and ENSCO 5002 are working concurrently, their rates are adjusted to mid 260s each ENSCO 5004 Semisubmersible - Conv F & G Enhanced 1500 OGX Mid 190s Brazil Sep. 11 While the ENSCO 5004 and ENSCO 5002 are working concurrently, their rates are adjusted to mid 260s each ENSCO 5005 Semisubmersible - Conv F & G Enhanced 1500/1700 Mid 230s Brazil Apr. 13 Eligible for bonus opportunity up to 10%, plus cost adjustments ENSCO 6000 Semisubmersible - DP 3400/4000 Low 150s Brazil Feb. 12 Currently outfitted for workover activity. Eligible for bonus opportunity up to 18%, plus cost adjustments ENSCO 5003 Semisubmersible - Conv Aker H-3 1000 Shipyard ---------- South Africa Sep. 11 Next to SOCO in Congo to Dec. 11, mid 180s. Plus one 1-well same rate option Kizomba Deepwater TLP Drilling Rig 5000 ExxonMobil Mid 70s Angola Apr. 15 Management fee paid daily Thunder Horse Deepwater Semisubmersible 6000 BP Mid 80s U.S. Gulf of Mexico Jan. 12 Management fee paid daily ENSCO I Barge Rig Cold stacked Singapore Brazil Middle East & Africa Barge Rig Deepwater Drilling Management Other Page 3 of 6 Ensco plc 22 July 2011 Segment / Region / Rig Design Water Depth' Customer/ Status Day Rate $000's US Location Est. Avail / Contract Change Comments Jackups ENSCO 59 F&G 300 Cold stacked Gulf of Mexico ENSCO 68 MLT 84-CE 400 Chevron Low 100s Gulf of Mexico Jan. 12 Day rate does not include certain extra reimbursable costs ENSCO 69 MLT 84-Slot 300 Cold stacked Gulf of Mexico ENSCO 75 MLT Super 116-C 400 Apache Low 100s Gulf of Mexico Oct. 11 ENSCO 81 MLT 116-C 350 Walter Low 80s Gulf of Mexico Aug. 11 ENSCO 82 MLT 116-C 300 Chevron High 70s Gulf of Mexico Jan. 12 Day rate does not include certain extra reimbursable costs ENSCO 86 MLT 82 SD-C 250 Apache Low 60s Gulf of Mexico Sep. 11 ENSCO 87 MLT 116-C 350 Apache Low 80s Gulf of Mexico Oct. 11 ENSCO 90 MLT 82 SD-C 250 Arena Energy High 50s Gulf of Mexico Nov. 11 ------------------------------------------------------------- ENSCO 99 MLT 82 SD-C 250 W&T Offshore Low 60s Gulf of Mexico Aug. 11 Pride Wisconsin MLT-Slot 300 Cold stacked Gulf of Mexico ENSCO 83 MLT 82 SD-C 250 Pemex Low 110s Mexico Nov. 12 Plus cost adjustments ENSCO 89 MLT 82 SD-C 250 Pemex Mid 70s Mexico Mar. 12 Rates adjust to global index rate every 3 months (next Aug. 11) ENSCO 93 MLT 82 SD-C 250 Pemex High 80s Mexico Mar. 12 Rates adjust to global index rate every 3 months (next Oct. 11) ENSCO 98 MLT 82 SD-C 250 Pemex Low 110s Mexico Apr. 12 Plus cost adjustments ENSCO 70 Hitachi K1032N 250 PA Resources High 80s Denmark Aug. 11 Next to Tullow to Dec. 11, low 90s. Then to RWE Dea to Oct. 12, high 80s, Plus five 1-well options at mutually agreed rates ENSCO 71 Hitachi K1032N 225 Maersk High 80s Denmark Mar. 12 Plus three 1-year options at escalating day rates ENSCO 72 Hitachi K1025N 225 Maersk High 80s Denmark Jun. 12 Plus three 1-year options at escalating day rates ENSCO 80 MLT 116-CE 225 Tullow High 80s UK Sep.11 Next to Wintershall to Feb. 12, low 90s, plus one 1-well option at mutually agreed rate deferred to after EOG. Then to Dana to Apr. 12, low 100s. Then to Perenco to Jul. 12, mid 90s, plus one 1-well same rate option. Then to EOG to Feb. 13, high 90s, plus one 2-well option at mutually agreed rate ENSCO 92 MLT 116-C 225 E.ON Low 100s UK Sep. 11 Next to RWE Dea Oct. 11 to Jun. 12, high 80s. Plus one 3-well option ENSCO 100 MLT 150-88-C 350 E.ON Mid 130s UK Mar. 12 ENSCO 101 KFELS MOD V-A 400 Maersk Low 170s UK Mar. 12 One unpriced option plus cost adjustments ENSCO 102 KFELS MOD V-A 400 ConocoPhillips Low 200s UK Jun. 16 Rate firm for 8 wells (est. 3 years) thereafter at mutually agreed rate. Plus options at mutually agreed rates ENSCO 85 MLT 116-C 300 PA Resources Mid 90s Tunisia Aug. 11 ------------------------------------------------------------- U.S. Gulf of Mexico - See Definitions and Disclaimers North & South America (excluding Brazil) Mexico Europe & Mediterranean North Sea Mediterranean Page 4 of 6 Ensco plc 22 July 2011 Segment / Region / Rig Design Water Depth' Customer/ Status Day Rate $000's US Location Est. Avail / Contract Change Comments Jackups ENSCO 54 F&G L-780 Mod II-C 300 ADOC/Bunduq High 50s UAE Feb. 12 Plus cost adjustments and well-to-well options at mutually agreed rate ENSCO 58 F&G 250 Saudi Aramco Mid 60s KSA Dec. 13 Plus one year same rate option ENSCO 76 MLT Super 116-C 350 Saudi Aramco Low 100s Saudi Arabia Jun. 14 Planned shipyard upgrade, mid Sep. 11 for approx. 30 days at zero rate. Plus one year option, high 150s ENSCO 84 MLT 82 SD-C 250 Contracted/shipyard Bahrain Oct. 11 Next to Saudi Aramco to Dec. 14, low 60s. Plus one 1-year option, mid 70s. Estimate 80 days downtime in early 2012 for planned shipyard upgrade at zero rate ENSCO 88 MLT 82 SD-C 250 Ras Gas Mid 60s Qatar Mar. 12 Plus multiple options at escalating rates ENSCO 91 Hitachi 270 Saudi Aramco Low 130s Saudi Arabia Jul. 11 ENSCO 94 Hitachi 250-C 250 Shipyard Mid 40s Qatar Dec. 11 Planned shipyard upgrade approx. 60 days, Jun. to Aug. 11 (42 days at mid 40s). Then mid 60s for RasGas to Dec. 11. Plus multiple options at escalating rates ENSCO 95 Hitachi 250-C 250 Sold --------- Sold in 2Q11 for $41 million. Book value equaled $27 million ENSCO 96 Hitachi 250-C 250 Contracted/shipyard Bahrain Sep. 11 Next to Saudi Aramco to Dec. 14, low 60s. Plus one 1-year option, mid 70s. Estimate 80 days downtime in early 2012 for planned shipyard upgrade at zero rate ENSCO 97 MLT 82 SD-C 250 Contracted/shipyard Bahrain Sep. 11 Next to Saudi Aramco to Dec. 14, low 60s. Plus one 1-year option, mid 70s. Estimate 80 days downtime in early 2012 for planned shipyard upgrade at zero rate Pride Hawaii Levingston 300 Cold stacked Bahrain Pride Pennsylvania MLT 300 Cold stacked Bahrain ENSCO 61 Levingston 300 Perenco High 80s Cameroon Dec. 11 Plus three 1-well same rate options ENSCO 52 F&G L-780 Mod II-C 300 Mid 70s Malaysia Mar. 13 Plus cost adjustments and one 1-year option ENSCO 53 F&G L-780 Mod II-C 300 Murphy Mid 70s Malaysia Sep. 11 ENSCO 56 F&G L-780 Mod II-C 300 Pertamina Mid 70s Indonesia Apr. 13 Plus mutually agreed rate 6-month option ENSCO 67 MLT 84-CE 400 Pertamina Low 100s Indonesia Jan. 13 Plus eight month option ENSCO 104 KFELS MOD V-B 400 ConocoPhillips Mid 120s Indonesia Aug. 11 Next to shipyard for planned upgrade, inspection and mob to Oct. 11 at zero rate. Then to Apache in Australia to work to Oct. 12, mid 140s. Plus one 1-year option. Plus approx. $3,000 per day for reimbursable upgrades amortized over 1-year term contract ENSCO 105 KFELS MOD V-B 400 Shipyard Singapore Aug. 11 Next to Talisman in Malaysia to Aug. 12, mid 120s. Two 1-year options at mutually agreed rates. Upgrades amortized over Talisman's primary contract term of approx. $6,000 per day ENSCO 106 KFELS MOD V-B 400 Newfield Low 120s Malaysia Mar. 12 Plus same rate 7-month option ENSCO 107 KFELS MOD V-B 400 Premier Oil Low 110s Jan. 12 Plus five 1-well options at index rate ENSCO 108 KFELS MOD V-B 400 TOTAL High 120s Brunei Jan. 12 Next to shipyard for planned inspection approx. 2 weeks at zero rate ENSCO 109 KFELS MOD V- Super B 350 Apache Mid 140s Australia Oct. 11 Next to shipyard approx. 10 days for planned inspection at zero rate. Then 10-day mob to PTTEP, low 100s, then work to Mar. 12, mid 160s TBD 1 KFELS Super A 400 Under construction Singapore 2Q13 TBD 2 KFELS Super A 400 Under construction Singapore 4Q13 Southeast Asia / Australia Under Construction - uncontracted Middle East & Africa Asia & Pacific Rim Middle East Africa Page 5 of 6 Ensco plc Fleet Status Report 22 July 2011 Legend of Ensco rig names to Pride International rig names ENSCO DS-1 Pride Africa ENSCO 5001 Pride South Pacific ENSCO DS-2 Pride Angola ENSCO 5002 Pride Sea Explorer ENSCO DS-3 Deep Ocean Ascension ENSCO 5003 Pride South Seas ENSCO DS-4 Deep Ocean Clarion ENSCO 5004 Pride Venezuela ENSCO DS-5 Deep Ocean Mendocino ENSCO 5005 Pride South Atlantic ENSCO DS-6 Deep Ocean Molokai ENSCO 5006 Pride North America ENSCO DS-7 Deep Ocean Marquesas ENSCO 58 Pride North Dakota ENSCO 6000 Pride South America ENSCO 59 Pride Tennessee ENSCO 6001 Pride Carlos Walter ENSCO 61 Pride Cabinda ENSCO 6002 Pride Brazil ENSCO 91 Pride Montana ENSCO 6003 Pride Rio de Janeiro Pride Hawaii Pride Hawaii ENSCO 6004 Pride Portland Pride Pennsylvania Pride Pennsylvania ENSCO 5000 Pride Mexico Pride Wisconsin Pride Wisconsin Definitions and Disclaimers Day Rate Definition. The day rates reflected in this Fleet Status Report are the operating day rates charged to customers, which may include estimated contractual adjustments for changes in operating costs and/or reimbursable cost adjustments for ongoing expenses such as crew, catering, insurance and taxes. The day rates, however, do not include certain types of non-recurring revenues such as lump sum mobilization payments, revenues earned during mobilizations, revenues associated with contract preparation and other non-recurring reimbursable items such as mobilizations and capital enhancements, and the impact of the fair market value adjustments to Pride’s drilling contracts in place on the 31 May 2011 acquisition date. Routine and non-routine downtime may reduce the actual revenues recognized during the contract term. Additionally, the Company occasionally negotiates special rates with customers as noted in the comments that reduce revenues recognized during the contract term. Rig Names. Upon completion of the merger with Pride International, Inc., we intend to rename Pride’s fleet in accordance with our naming convention. We are in the process of completing these name changes, some of which may not be completed for some time. For purposes of our Fleet Status Report, we are using the new names even when the name change has not been completed. Below is a legend showing the name changes. Forward Looking Statement. The statements contained in this Fleet Status Report that are not historical facts are 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. Such forward-looking statements include, but are not limited to, statements involving future rig rates, cost adjustments, utilization, our estimated rig availability, contract duration, customers or contract status, rig enhancement projections, shipyard construction or work completion, and other contract commitments, including new rig commitments, contract terms, the period of time and number of rigs that will be in a shipyard for repairs, maintenance, enhancement or construction and scheduled delivery dates for new rigs. Such statements are subject to numerous risks, uncertainties and assumptions, including but not limited to, uncertainties relating to the level of activity in offshore oil and gas exploration and development, exploration success by producers, oil and gas prices, competition and market conditions in the contract drilling industry, shipyard delays and related risks, actions and approvals of third parties (including delays in our customers' ability to obtain drilling permits in the U.S. Gulf of Mexico and elsewhere), possible cancellation or suspension of drilling contracts as a result of mechanical difficulties or performance or other reasons, our ability to enter into and the terms of future contracts, the availability of qualified personnel, labor relations and unionization efforts, operating hazards, changes in the commencement dates of new contracts, the actual amount of downtime (including downtime incurred by reason of enhanced blow-out preventer certification and testing requirements), factors resulting in reduced applicable dayrates, hurricanes and other weather conditions, terrorism, political and other uncertainties inherent in global operations (including the risk of war, civil disturbance, seizure or damage of equipment and exchange and currency fluctuations), the impact of governmental laws and regulations, the adequacy of sources of liquidity, the effect of litigation and contingencies and other factors described above and discussed in our most recently filed Form 10-K, in our Forms 10-Q for subsequent periods and in our other filings with the SEC, which are available free of charge on the SEC’s website at www.sec.gov or by contacting our Investor Relations Department at 713-917-2244 or by referring to the Investor Relations section of our website at www.enscoplc.com. Should one or more of these risks or uncertainties materialize, or should underlying assumptions prove incorrect, actual results may vary materially from those indicated. You should not place undue reliance on forward-looking statements. Each forward-looking statement speaks only as of the date of the particular statement, and we undertake no obligation to publicly update or revise any forward looking statements, except as required by law. U.S. Gulf of Mexico. Certain Ensco rigs in the U.S. Gulf of Mexico have been and may be further affected by the regulatory developments and other actions that have or may be imposed by the U.S. Department of the Interior. Ensco rig utilization and day rates have been negatively influenced due to regulatory requirements and delays in our customers’ ability to secure drilling and associated permits. Current or future NTLs or other directives, legislation or regulations may further impact our customers' ability to obtain permits and commence or continue deep- or shallow-water operations in the U.S. Gulf of Mexico. We continue to work with our customers on mutually agreeable contingency plans for our deepwater rigs in the U.S. Gulf of Mexico. In certain cases, we have negotiated reduced day rates with existing customers and/or sublet agreements with other customers in the U.S. Gulf of Mexico or elsewhere. Ensco has rejected all force majeure notices received since the Macondo well incident as invalid under the terms of the applicable drilling contracts. During mid-December 2010, Ensco received a force majeure notice from Nexen regarding ENSCO 8501. Following delivery of the force majeure notice, Nexen only paid the $280,000 force majeure rate (75% of the mid-$370,000 invoiced applicable day rate at the time) under recent invoices. Ensco, in turn, notified Nexen that it is in default, which Nexen has denied. Ensco has commenced litigation to resolve the dispute. The full impact of the government’s actions and the regulations discussed in this note and potential new regulatory, legislative or permitting requirements has not yet been determined, but could have a further material adverse effect upon our results of operations. Page 6 of 6 Exceeding Expectation 5-Year Term Contract 5-Year Term Contract 5-Year Term Contract