The following deals were announced in 2011:

KINDER MORGAN INC. Acquisition of EL PASO CORP.

Description: Kinder Morgan Inc. of Houston plans to acquire El Paso Corp., also of Houston, in a deal valued at about $36.2 billion in cash, stock, warrants and assumed debt. Announced on Nov. 16, 2011, and pending.

Counsel to Kinder Morgan: In-house; Bracewell & Giuliani; Weil, Gotshal & Manges; Vinson & Elkins; Latham & Watkins; Simpson Thacher & Bartlett

Counsel to El Paso: Wachtell, Lipton, Rosen & Katz; Sullivan & Cromwell; Cravath, Swaine & Moore

BHP BILLITON PLC Acquisition of PETROHAWK ENERGY CORP.

Description: Australian company BHP Billiton PLC acquired Houston-based Petrohawk Energy Corp. in a cash deal valued at about $15.6 billion, including assumed debt. Closed in August 2011.

Counsel to BHP Billiton: In-house; Sullivan & Cromwell; Morgan, Lewis & Bockius; Allen & Overy; Blake Dawson (now Ashurst)

Counsel to Petrohawk: In-house; Simpson Thacher & Bartlett; Latham & Watkins

ENERGY TRANSFER EQUITY LP Acquisition of SOUTHERN UNION CO.

Description: Energy Transfer Equity of Dallas, a general partner of Energy Transfer Partners, acquired Southern Union Co. of Houston in a deal valued at about $7.9 billion, including assumed debt. Closed in March 2012.

Counsel to Energy Transfer Equity: In-house; Latham & Watkins; Bingham McCutchen; Alston & Bird; Potter Anderson & Corroon; Vinson & Elkins

Counsel to Southern Union Co.: In-house; Locke Lord; Roberts & Holland; Morris Nichols Arsht & Tunnell; Sullivan & Cromwell; Cleary Gottlieb Steen & Hamilton; Roberts & Holland

ENSCO PLC Acquisition of PRIDE INTERNATIONAL INC.

Description: London’s ENSCO PLC acquired Pride International Inc. of Houston for about $7.3 billion in cash and stock. Closed in May 2011.

Counsel to ENSCO: In-house; Baker & McKenzie; Fried, Frank, Harris, Shriver & Jacobson

Counsel to Pride: In-house; Baker Botts; Wachtell, Lipton, Rosen & Katz; Shearman & Sterling; Sullivan & Cromwell

TEXAS INSTRUMENTS INC. Acquisition of NATIONAL SEMICONDUCTOR

Description: Texas Instruments Inc. of Dallas acquired Santa Clara, Calif.-based National Semiconductor for about $6.5 billion in cash. Closed in September 2011.

Counsel to TI: In-house; Jones Day; Slaughter & May; Raidla Lejins & Norcous

Counsel to National Semiconductor: In-house; Latham & Watkins; Shearman & Sterling

KINETIC CONCEPTS INC. Leveraged Buyout

Description: San Antonio-based pharmaceutical company Kinetic Concepts Inc. merged with a subsidiary of Chiron Holdings Inc., and became a wholly-owned subsidiary of Chiron in a leveraged buyout valued at about $5.8 billion. Chiron is led by London-based Apax Partners. Closed in November 2011.

Counsel to Kinetic Concepts: Skadden, Arps, Slate, Meagher & Flom; Cox Smith Matthews; Morgan, Lewis & Bockius; Sullivan & Cromwell

Counsel to Chiron: Simpson Thacher & Bartlett; Kirkland & Ellis; Epstein Becker Borsody & Green; Andrews Kurth; Weil, Gotshal & Manges; Torys; Ashurst

STATOIL ASA Acquisition of BRIGHAM EXPLORATION CO.

Description: Brigham Exploration Co. of Austin was acquired by Statoil ASA, a Norwegian company, for about $4.4 billion in cash. Closed in November 2011

Counsel to Statoil: Vinson & Elkins

Counsel to Brigham: In-house; Thompson & Knight; Alston & Bird

INTERNATIONAL PAPER CO. Acquisition of TEMPLE-INLAND INC.

Description: International Paper Co. of Memphis acquired Austin-based Temple-Inland Co. for about $4.3 billion in cash and assumed debt. Closed in February 2012.

Counsel to International Paper: Debevoise & Plimpton; Gibson, Dunn & Crutcher

Counsel to Temple-Inland: In-house; Wachtell, Lipton, Rosen & Katz; Sullivan & Cromwell

MARATHON OIL CORP. Acquisition of shale assets from HILCORP RESOURCES HOLDINGS LP

Description: Houston’s Marathon Oil Corp. bought Eagle Ford shale assets from Hilcorp Resources Holdings LP of Houston for about $3.5 billion. Hilcorp is a partnership between affiliates of Hilcorp Energy Co. and Kohlberg Kravis Roberts & Co. Closed in November 2011.

Counsel to Marathon: In-house; Baker Botts

Counsel to Hilcorp: Andrews Kurth; Simpson Thacher & Bartlett

NOBLE ENERGY INC. Joint Venture with CONSOL ENERGY INC.

Description: Houston-based Noble Energy Inc. entered into a joint venture partnership valued at about $3.3 billion with CONSOL Energy Inc. of Pittsburgh for a large Marcellus Shale property. Closed in October 2011.

Counsel to Noble: In-house; Porter & Hedges

Counsel to CONSOL: In-house; Vinson & Elkins; Wachtell, Lipton, Rosen & Katz

Sources: Thomson Reuters, Texas Lawyer ‘s Dealmaker and New Deals columns, AmLaw Daily