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A Method for Selection of Cement Recipes To Control Fluid Invasion After Cementing

1990; Volume: 5; Issue: 04 Linguagem: Inglês

10.2118/19522-pa

2469-8520

R. M. Beirute, P. R. Cheung,

Hydraulic Fracturing and Reservoir Analysis

Summary A method to scale down well parameters to laboratory conditions for more realistic testing of cement recipes to be used to control wellbore invasion/migration of formation fluids after cementing is introduced. The scale-down procedure proposed here addresses a worst-case scenario. It assumes that the offending gas zone (source of the invading gas) has enough permeability, thickness, and gas volume to invade fully and to pressure-charge the cemented annulus (cement column), if conditions allow. The method is demonstrated in conjunction with the use of a certain laboratory gas-flow apparatus. This general scale-down procedure can be used with other test equipment. An imaginary set of well conditions is used to illustrate the mechanics of the use of the technique. Tests run with the procedure and the computer-monitored gas-migration test cell are described. A preliminary set of criteria for selecting a cement recipe for a given well is presented. A field case illustrates the use of the procedure.