Schlumberger Technology Corporation

Andre Salvaire

Joel Rondeau

Philippe Gambier

Greg Giem

An apparatus for regulating fluid-flow during a primary cementing job comprises a bottom cementing plug, adapted to house a one-way valve and means to regulate fluid flow through the plug interior. The apparatus is useful for minimizing or preventing free fall or U-tubing during primary cementing. The apparatus is compatible with conventional cementing-plug launching systems.

Apparatus and methods for well cementing

The present invention relates in general to equipment for servicing subterranean wells and in particular to a cementing head that is intended to drop a combination of darts, balls, bombs and canisters in order to activate downhole equipment, launch cementing plugs, deliver chemical products, or the like. A cementing head comprises a modular valve apparatus, comprising at least two detatchable parts. This arrangement allows the operator to remove and disassemble the valve apparatus at the wellsite. Thus, repairs and maintenance may be performed at the wellsite and the valve apparatus may be reassembled and reinstalled, obviating the need to transport the equipment to a central facility.

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Montigny le Bretonneux, France

Andre Salvaire