Methods of removing water-based drilling fluids and compositions
AssigneeHalliburton Energy Services, Inc.
InventorsJiten Chatterji, Sears T. Dealy, Ronald J. Crook
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Abstract
The present invention provides methods and compositions for removing a water-based drilling fluid from surfaces in a well bore and leaving the surfaces water-wet. A method of the invention basically comprises the following steps. A water-based drilling fluid removal solution comprised of water and a mixture of a sulfonated kraft lignin salt and an N-methyl-N-oleyltaurine salt dissolved therein is provided. The drilling fluid is displaced from the well bore and the well bore surfaces are contacted with the removal solution to thereby remove the drilling fluid from the surfaces and make the surfaces water-wet.
Claims17
A method of removing a water-based drilling fluid from surfaces in a well bore and leaving the surfaces water-wet comprising the steps of:
- (a) providing a water-based drilling fluid removal solution comprised of water and a mixture of a sulfonated kraft lignin salt and an N-methyl-N-oleyltaurine salt dissolved therein;
- and
- (b) displacing said drilling fluid from said well bore and contacting said well bore surfaces with said removal solution to thereby remove said drilling fluid from said surfaces and make said surfaces water-wet.
A method of removing a water-based drilling fluid from a well bore having a pipe string disposed therein, making the surfaces of the pipe string and the well bore water-wet and placing a hydraulic cement composition in the annulus between the pipe string and the walls of the well bore whereby upon setting the hydraulic cement composition readily bonds to the surfaces of the pipe string and well bore and seals the annulus, comprising the steps of:
- (a) providing a water-based drilling fluid removing spacer comprised of a water solution having a mixture of a sulfonated kraft lignin salt and an N-methyl-N-oleyltaurine salt dissolved therein;
- (b) pumping said spacer through said pipe string and through the annulus between said pipe string and the walls of said well bore so that drilling fluid is displaced from said well bore and pipe string surfaces forming said annulus and said surfaces are made water-wet to said hydraulic cement composition;
- (c) placing said hydraulic cement composition in said annulus by pumping said hydraulic cement composition through said pipe string and through said annulus thereby displacing and removing said spacer from said annulus;
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- (d) allowing said hydraulic cement composition to set.
Dependencies are inferred from the claim text.