Methods and oil-based settable drilling fluid compositions for drilling and cementing wells
AssigneeHalliburton Energy Services, Inc.
InventorsJames E. Griffith, Jiten Chatterji, Bobby J. King, John L. Dennis JR.
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Abstract
Methods for drilling well bores and cementing a pipe string in the well bores using oil-based settable drilling fluids are provided. The oil-based settable drilling fluid compositions basically comprise an oil external emulsion comprising oil, water and an emulsifying surfactant; a hydraulically settable component; and a de-emulsifying surfactant for de-emulsifying the oil-external emulsion when the emulsion is cured.
Claims54
A method of drilling a well bore and cementing a pipe string in said well bore comprising the steps of:
- preparing an oil-based settable drilling fluid composition comprising an oil external emulsion which comprises oil, water and an emulsifying surfactant;
- a hydraulically settable component;
- and a de-emulsifying surfactant for de-emulsifying said oil-external emulsion when the emulsion is cured;
- drilling said well bore using said settable drilling fluid;
- running said pipe string to be cemented into said well bore;
- displacing said drilling fluid composition out of said pipe string;
- and
- allowing said settable drilling fluid in the annulus between the pipe string and the walls of said well bore to set.
A method of drilling a well bore and cementing a pipe string in said well bore comprising the steps of:
- preparing an oil-based settable drilling fluid composition comprising an oil external emulsion which comprises oil, water and an emulsifying surfactant;
- a hydraulically settable component;
- an activator for said hydraulically settable component selected from the group consisting of calcium chloride, zinc acetate, zinc formate and mixtures thereof;
- and a de-emulsifying surfactant for de-emulsifying said oil-external emulsion when said emulsion is cured;
- drilling said well bore using said settable drilling fluid;
- running said pipe string to be cemented into said well bore;
- displacing said drilling fluid composition out of said pipe string;
- and
- allowing said settable drilling fluid in the annulus between the pipe string and the walls of said well bore to set.
A method of drilling a well bore and cementing a pipe string in said well bore comprising the steps of:
- preparing an oil-based settable drilling fluid composition comprising an oil external emulsion which comprises oil, water and an emulsifying surfactant;
- a hydraulically settable component;
- an activator for said hydraulically settable component selected from the group consisting of calcium hydroxide, sodium hydroxide, sodium silicate and mixtures thereof;
- and a de-emulsifying surfactant for de-emulsifying said oil-external emulsion when said emulsion is cured;
- drilling said well bore using said settable drilling fluid;
- running said pipe string to be cemented into said well bore;
- displacing said drilling fluid composition out of the pipe string;
- and
- allowing said settable drilling fluid in the annulus between the pipe string and the walls of said well bore to set.
A method of drilling a well bore and cementing a pipe string in said well bore comprising the steps of:
- preparing an oil-based settable drilling fluid composition comprising an oil external emulsion which comprises oil, water and an emulsifying surfactant;
- a mixture of silica fume and pozzolan wherein the weight ratio of silica fume to pozzolan is about 40:60;
- an activator for said mixture of silica fume and pozzolan comprising lime;
- and a de-emulsifying surfactant for de-emulsifying said oil-external emulsion when said emulsion is cured;
- drilling said well bore using said settable drilling fluid;
- running said pipe string to be cemented into said well bore;
- displacing said drilling fluid composition out of said pipe string;
- and
- allowing said settable drilling fluid in the annulus between the pipe string and the walls of said well bore to set.
A method of drilling a well bore and cementing a pipe string in said well bore comprising the steps of:
- preparing an oil-based settable drilling fluid composition comprising an oil external emulsion which comprises oil, water and an emulsifying surfactant;
- a mixture of Portland cement and blast furnace slag having a weight ratio of Portland cement to blast furnace slag in the range of from about 80:20 to about 60:40;
- an activator for said mixture of Portland cement and blast furnace slag comprising lime;
- and a de-emulsifying surfactant for de-emulsifying said oil-external emulsion when said emulsion is cured;
- drilling said well bore using said settable drilling fluid;
- running said pipe string to be cemented into said well bore;
- displacing said drilling fluid composition out of said pipe string;
- and
- allowing said settable drilling fluid in the annulus between the pipe string and the walls of said well bore to set.
A method of drilling a well bore and cementing a pipe string in said well bore comprising the steps of:
- preparing an oil-based settable drilling fluid composition comprising an oil external emulsion which comprises oil, water and an emulsifying surfactant;
- a mixture of Portland cement and pozzolan having a weight ratio of Portland cement to pozzolan of about 50:50;
- an activator for said mixture of Portland cement and pozzolan comprising lime;
- and a de-emulsifying surfactant for de-emulsifying said oil-external emulsion when said emulsion is cured;
- drilling said well bore using said settable drilling fluid;
- running said pipe string to be cemented into said well bore;
- displacing said drilling fluid composition out of said pipe string;
- and
- allowing said settable drilling fluid in the annulus between the pipe string and the walls of said well bore to set.
Dependencies are inferred from the claim text.