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Contact time in cementing

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Contact time is the period of time that a fluid flows past a particular point in the annular space during displacement. Contact time is an important consideration for successful cementing.

Estimation of contact time

Studies indicate that a contact time of 10 minutes or longer provides excellent removal of most drilling fluids. The volume of fluid needed to provide a specific contact time is



Vt = volume of fluid (turbulent flow), ft3 ;

tc = contact time, min;

qd = displacement rate, bbl/min;


5.615 = conversion between ft3 and bbl.

The calculation is simple, because only two readily available factors are required, and the calculation is independent of casing and hole size. The equation holds, as long as all of the fluid passes the point of interest.[1]


  1. Brice JR., J.W. and Holmes, B.C. 1964. Engineered Casing Cementing Programs Using Turbulent Flow Techniques. J Pet Technol 16 (5): 503-508. SPE-742-PA. [edit]

See also

Cementing operations

Hole preparation in cementing


Noteworthy papers in OnePetro

External links