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Contact time in cementing: Difference between revisions

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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.
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==
== 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
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


[[File:Vol2 page 0382 eq 001.png]]....................(1)
[[File:Vol2 page 0382 eq 001.png|RTENOTITLE]]....................(1)


where  
where


V<sub>t</sub> = volume of fluid (turbulent flow), ft<sup>3</sup> ;  
V<sub>t</sub> = volume of fluid (turbulent flow), ft<sup>3</sup>&nbsp;;


t<sub>c</sub> = contact time, min;  
t<sub>c</sub> = contact time, min;


q<sub>d</sub> = displacement rate, bbl/min;  
q<sub>d</sub> = displacement rate, bbl/min;


and
and


5.615 = conversion between ft<sup>3</sup> and bbl.  
5.615 = conversion between ft<sup>3</sup> 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.<ref name="r1">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. http://dx.doi.org/10.2118/742-PA.
[edit]</ref>


== References ==


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.<ref name="r1" />
<references />


==References==
== See also ==
<references>
<ref name="r1">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. http://dx.doi.org/10.2118/742-PA.</ref>
</references>


== See also ==
[[Cementing_operations|Cementing operations]]
[[Cementing operations]]


[[Hole preparation in cementing]]
[[Hole_preparation_in_cementing|Hole preparation in cementing]]


[[PEH:Cementing]]
[[PEH:Cementing]]


==Noteworthy papers in OnePetro ==
== Noteworthy papers in OnePetro ==


== External links ==
== External links ==


[[1.13 Casing and cementing]]
[[Category:1.13 Casing and cementing]] [[Category:YR]]

Latest revision as of 14:03, 25 June 2015

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

RTENOTITLE....................(1)

where

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

tc = contact time, min;

qd = displacement rate, bbl/min;

and

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]

References

  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. http://dx.doi.org/10.2118/742-PA. [edit]

See also

Cementing operations

Hole preparation in cementing

PEH:Cementing

Noteworthy papers in OnePetro

External links