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US 7,842,651 B2Granted
Silicate drilling fluid composition containing lubricating agents and uses thereof
AssigneeChengdu Cationic Chemistry Company, Inc.
InventorsAnming Wu, Xing Yan
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Abstract
The present disclosure relates to the compositions of a water-based silicate drilling fluid comprising: (1) alkali metal silicates; (2) cationic polyacrylamide; (3) a lubricant composition; and (4) other conventional drilling fluid additives. The lubricant composition comprises a lubricating effective amount of a carrier oil and one or more lubricants selected from lecithins, sulfurized vegetable and/or lard oils or modified castor oil.
Claims35
A silicate drilling fluid composition comprising:
- (a) water as a continuous phase;
- (b) alkali metal silicates;
- (c) a lubricating effective amount of a lubricant composition comprising a carrier oil and one or more lubricants selected from the group consisting of:
- (i) lecithins,
- (ii) sulfurized vegetable oil, sulfurized lard oil, sulfurized vegetable esters, and/or sulfurized lard esters, and
- (iii) modified castor oil;
- (d) cationic polyacrylamides;
- and
- (e) optionally, other conventional silicate drilling fluid additives selected from the group consisting of pre-hydrated clay mineral viscosifiers, polymer viscosifiers, filtration reducers, weighting agents, foaming lighting agents, bridging agents, defoamers and high temperature stabilizers.
6 more elements
A process for imparting lubricity to an aqueous drilling fluid comprising:
- (a) providing an aqueous drilling fluid comprising a cationic polyacrylamide;
- (b) providing a lubricating effective amount of a lubricant composition comprising a carrier oil and one or more lubricants selected from the group consisting of:
- (i) lecithins,
- (ii) sulfurized vegetable oil, sulfurized lard oil, sulfurized vegetable esters, and/or sulfurized lard esters, and
- (iii) modified castor oil;
- and
- (c) introducing the lubricant composition into the aqueous drilling fluid.
4 more elements
Dependencies are inferred from the claim text.