Halliburton Energy Services, Inc.

Julio Alberto Cornejo

Henry Eugene Rogers

Lonnie Carl Helms

Frank Vinicio Acosta

Stephen Allen Yeldell

Kevin Wendell Ardoin

Saul Emmanuel Vazquez Niebla

Rafael Hernandez

A cementing tool for use in well drilling operations includes a body forming an inner bore, the body having circulation ports allowing flow from the inner bore to an exterior of the body; an opening sleeve mounted within the body to release from a first opening sleeve position to open the circulation ports when in a second position; an opening seat attached to the opening sleeve; an opening seat collet retainer engaged with the opening seat; a closing sleeve mounted within the body above the opening sleeve and to release from a first closing sleeve position to close the circulation ports; a closing seat attached to the closing sleeve; the closing seat is to apply pressure to the opening seat collet retainer; and the opening seat collet retainer is to release from the opening seat once a predetermined amount of pressure is applied from the closing seat.

Multiple stage cementing tool and method of use

A buoyancy assist tool has an outer case with a rupture disk assembly connected therein. The buoyancy assist tool defines the upper end of a buoyancy chamber in a well casing. A sleeve in the outer case traps the rupture disk membrane after it has ruptured to provide full bore flow through the casing.

Full bore buoyancy assisted casing system

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Sugar Land, TX, United States of America

Julio Alberto Cornejo