Bronco Drilling Co. Inc., Oklahoma City, (Nasdaq: BRNC) has named Karl W. Benzer chief operating officer. Benzer was a vice president and division manager of Unit Drilling Co.

Cal Dive International Inc., Houston, (Nasdaq: CDIS) has named Bart H. Heijermans executive vice president and chief operating officer. Heijermans was senior vice president, offshore and gas storage, for a North American midstream firm.

Cooper Cameron Corp., Houston, (NYSE: CAM) has named Erik Peyrer vice president, business development, Asia Pacific and Middle East. Peyrer was vice president and general manager, Asia Pacific and Middle East.

Dresser Inc., Dallas, has named Robert D. Woltil senior vice president of finance and accounting and James A. Nattier executive vice president of ethics and compliance.

Woltil was chief financial officer of Sun Healthcare Group Inc., while Nattier was executive vice president and CFO of Dresser.

Genoil Inc., Calgary, (Toronto Venture: GNO; OTCBB: GNOLF) has named James Runyan senior vice president of engineering and operations. Runyan has experience in engineering, procurement and construction.

Key Energy Services Inc., Houston, (Pink Sheets: KEGS) has named J. Marshall Dodson vice president and chief accounting officer. Dodson was managing director and controller for the Dynegy Generation business of Dynegy Inc.

James Cowan has resigned as president and chief operating officer of Maverick Tube Corp., St. Louis (NYSE: MVK).

C. Robert Bunch, chief executive officer, will assume the title of president. The company has no current plan to fill the COO position.

Separately, Jack B. Moore has been named a director. Moore is senior vice president of Cooper Cameron Corp. and president of its Cameron division.

Noble Corp., Sugar Land, Texas, (NYSE: NE) has named Bruce W. Busmire senior vice president and chief financial officer, treasurer and controller. Busmire was managing director of Pickering Energy Partners Inc.

Omni Energy Services Corp., Carencro, La., (Nasdaq: OMNI) has named Barry E. Kaufman to its board. Kaufman is a member of Silver Fox Advisors.

ShawCor Ltd., Toronto, (Toronto: SCL) has named William P. Buckley to its board. Buckley is president and chief executive officer of ShawCor.

Trico Marine Services Inc., Houston, (OTCBB: TRMA) has named Trevor Turbidy president and chief executive officer to replace Joseph S. Compofelice, who was interim CEO. Turbidy was vice president and chief financial officer of Trico.

Geoff Jones has been named vice president and CFO. Jones was treasurer.

WellPoint Systems Inc., Calgary, (Toronto Venture: WPS) has named Wanda Dorosz to its board. Dorosz is president and chief executive officer of The Quorum Group of Cos.

Wenzel Downhole Tools Ltd., Calgary, (Toronto: WZL) has named Scott Clements a director. Clements recently retired as chief executive officer of the Edmonton Regional Airports Authority.

Ken Hughes has been named lead director. Hughes has worked in the public and private sector.