Drilling mud-cement compositions for well cementing operations

Details Drilling mud-cement compositions for well cementing operations Drilling mud-cement compositions for well cementing operations

C - Chemistry, Metallurgy

09

K

31/33, 31/8, 261

C09K 8/05 (2006.01) C04B 9/00 (2006.01) C04B 28/30 (2006.01) C09K 8/42 (2006.01)

Patent

CA 1053892

Abstract of the Disclosure In accordance with the instant invention, there is provided herein a method and composition for drilling and cementing well boreholes in accordance with which a magnesium oxysulfate cement is formed in the drilling mud. Disclosed by this invention is a method and composition wherein the drilling fluid is transformed into a cementitious mass of magnesium oxysulfate cement thereby increasing the compatibility of the ementing composition with the drilling fluid and improving the cement bond to the face of the borehole. This is accomplished by forming a magnesium oxy- sulfate cement from a magnesium inorganic salt-based drilling fluid to produce an economical and sufficiently strong expansive cement having acceptable setting time for well cementing purposes. The cement compositions may be formed using water or brine sol- ution rather than mud if desired. Hence, brine or water may be added as desired to modify the viscosity characteristics of the cement.

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