Means for improving cement placement in horizontal wells

Details Means for improving cement placement in horizontal wells Means for improving cement placement in horizontal wells

E - Fixed Constructions

21

B

E21B 33/14 (2006.01) C09K 8/42 (2006.01)

Patent

CA 2144846

A well completion process for improved cement placement in a horizontal wellbore (10) where a fluid is circulated down the wellbore (10) for conditioning and cleaning it. Afterwards, a production tube (12) containing centralizers (14) is positioned centrally within the wellbore (10). Next, a "spacer fluid" is circulated within an annulus (18) formed by the space between the tube (12) and the wellbore (10) so as to clean the annulus (18) out. Subsequently, a cement having a density greater than the spac- er fluid is pumped into the annulus (18). Thereafter, a light weight cement is pumped into the annulus (18) thereby overriding the heavier cement and removing voids in the annulus (18) resulting in more efficient cement placement.

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