Method for drilling and cementing a well

Details Method for drilling and cementing a well Method for drilling and cementing a well

E - Fixed Constructions

21

B

E21B 33/13 (2006.01) C04B 7/153 (2006.01) C04B 28/08 (2006.01) C09K 8/42 (2006.01) C09K 8/46 (2006.01) E21B 3/00 (2006.01) E21B 7/20 (2006.01) E21B 33/14 (2006.01)

Patent

CA 2147490

A borehole is drilled utilizing a conventional drilling fluid or a drilling fluid such as one containing a cementitious component selected from blast furnace slag, a metal oxide component of an ionomer or a metal oxide component of a phosphate salt. A compatible cementitious slurry containing blast furnace slag and an activator system is then introduced into the borehole and displaced up into an annulus by direct contact with a displacement fluid. Generally, in the case of the slag-containing drilling fluid the cementitious slurry is prepared by adding additional blast furnace slag and an activator such as a sodium hydrox- ide/sodium carbonate mixture to the used drilling fluid. Similarly, in the case of the ionom- ers or phosphates, additional metal oxide component and the reactive second component can be added to the used drilling fluid to produce the cementitious slurry.

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