FROM THE COMPLETIONSPECIALIST'Sviewpoint, proper primary cementing should be the operator's main concern. Poor displacement efficiency which leaves a substantial volume of mud at the cement-formation interface can lead to just about every completion and production problem in the book-oil and gas can be lost from the pay zone, stimulation fluids and enhanced recovery chemicals can bypass the formation, extraneous fluids may be produced and the borehole may not be properly supported. It is important to plan for the primary cement job long before casing is run into the hole, to avoid common problems such as improperly conditioned mud and stuck pipe. And the casing string itself should be carefully inspected and handled to avoid damage that can cause failure in otherwise properly designed strings.
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