Well bore drilling direction changing method
AssigneeHalliburton Company
InventorsKirk L. Harris, Clyde Cook, Jr.
Life of this patent
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Abstract
This invention relates to a method of changing the direction of drilling a well bore wherein a cement plug is formed in the well bore at a location therein where the direction of drilling is to be changed and a pilot hole is drilled in the plug. The cement plug is formed using a slurry containing hydraulic cement consisting of discrete particles having a particle size not greater than about 30 microns. The use of such finely divided hydraulic cement significantly reduces the waiting time required for the slurry to develop sufficient compressive strength.
Claims20
A method of changing the direction of drilling a well bore comprising the steps of:
- placing a slurry of hydraulic cement in water in said well bore at a location therein where said direction of drilling is to be changed and in an amount sufficient to form a plug therein;
- allowing said slurry to set into a rigid plug in said well bore;
- drilling a pilot hole in said cement plug in the desired new direction of drilling;
- continuing the drilling of said well bore by way of said pilot hole in said cement plug;
- and
- wherein said slurry is comprised of a mixture of water and said hydraulic cement in the ratio of from about 0.5 to about 5.0 pounds of water per pound of cement, the particle size of said hydraulic cement is no greater than about 30 microns, and the Blaine Fineness of said hydraulic cement is no less than about 6,000 square centimeters per gram.
A method of changing the direction of drilling well bore comprising the steps of:
- placing a slurry of hydraulic cement in water in said well bore at a location therein where said direction of drilling is to be changed and in an amount sufficient to form a plug therein;
- allowing said slurry to set into a rigid plug in said well bore;
- placing one or more oriented directional drilling tools adjacent said cement plug;
- drilling a pilot hole in said cement plug using said one or more directional drilling tools whereby said pilot hole is positioned in the desired new direction of drilling;
- and
- continuing the drilling of said well bore by way of said pilot hole in said cement plug;
- wherein said slurry is comprised of a mixture of water and hydraulic cement in the ratio of from about 0.5 to about 5.0 pounds of water per pound of cement, the particle size of said hydraulic cement is no greater than about 30 microns, and the Blaine Fineness of said hydraulic cement is no less than about 6,000 square centimeters per gram.
A method of changing the direction of drilling a well bore comprising the steps of:
- placing a slurry of hydraulic cement in water in said well bore at a location therein where said direction of drilling is to be changed and in an amount sufficient to form a plug therein;
- allowing said slurry to set into a rigid plug in said well bore;
- placing one or more oriented directional drilling tools adjacent said cement plug;
- drilling a pilot hole in the desired new direction of drilling in said cement plug using said one or more directional drilling tools;
- removing said one or more directional drilling tools from said well bore;
- continuing the drilling of said well bore by way of said pilot hole in said cement plug;
- and
- wherein said slurry is comprised of a mixture of water and hydraulic cement in the ratio of from about 0.5 to about 5.0 pounds of water per pound of cement, the particle size of said hydraulic cement is no greater than about 30 microns, and the Blaine Fineness of said hydraulic cement is no less than about 6,000 square centimeters per gram.
Dependencies are inferred from the claim text.