Well drilling fluids having clay control properties
View Patent ↗Clay is stabilized in the drilling of wells and other formation treatment for hydrocarbon production by the addition to the drilling or other fluid including a choline compound together with an formation control additive.
1. An aqueous drilling fluid consisting essentially of a choline compound and a formation control additive, wherein the formation control additive includes an amine, a cationic formation control additive, or mixtures and combinations thereof,
wherein the ratio of choline compound to formation control additive is from about 75:25 to about 25:75.
2. The drilling fluid of claim 1 , wherein the choline compound is selected from the group consisting of an alkali salt of choline, a carboxyate salt of choline, choline sulfate, choline sulfite, choline phosphate, choline phosphite, and mixtures or combinations thereof.
3. The drilling fluid of claim 1 , wherein the choline compound is selected from the group consisting of choline fluoride, choline chloride, choline bromide, choline iodide, and mixtures or combinations thereof.
4. The drilling fluid of claim 1 , wherein the choline compound comprises choline chloride.
5. The drilling fluid of claim 1 , wherein the amine is selected from the group consisting of di-alkyl substituted amines, tri-alkyl substituted amines, and mixtures or combinations thereof, where the alkyl groups include from 3 to 20 carbon atoms and/or hetero atoms.
6. The drilling fluid of claim 1 , wherein the cationic formation control additive is selected from the group consisting of single-site cationic ammonium compounds, oligocationic ammonium compounds, polycationic ammonium compounds, and mixtures or combinations thereof.
7. The well drilling fluid of claim 1 , wherein the cationic formation control additive comprises tetramethylammonium chloride.
8. The drilling fluid of claim 1 , wherein the cationic formation control additive comprises a homopolymer of dimethyl diallyl ammonium chloride.
9. The drilling fluid of claim 1 , wherein the cationic formation control additive comprises a copolymer of dimethyl diallyl ammonium chloride and about 1% to about 65% by weight acrylic acid or hydrolyzed acrylamide.
10. The drilling fluid of claim 1 , further comprising potassium formate.
11. The drilling fluid of claim 10 , wherein the potassium formate is generated in situ from potassium hydroxide and formic acid.
12. The drilling fluid of claim 1 , wherein a combined concentration of the formation control additive and the choline compound is at least 0.001% by weight of the well drilling fluid.
13. The drilling of claim 1 , wherein the choline compound a carboxyate salt of choline.
14. An aqueous drilling fluid comprising a cationic formation control additive and choline chloride, where the cationic formation control additive includes single-site cationic ammonium compounds, oligocationic ammonium compounds, polycationic ammonium compounds, or mixtures and combinations thereof and where the cationic formation control additive and the choline chloride are present in a weight ratio from about 75:25 to about 25:75.
15. The well drilling fluid of claim 14 , wherein the cationic formation control additive comprises tetramethylammonium chloride.
16. The drilling fluid of claim 14 , wherein the cationic formation control additive comprises a homopolymer of dimethyl diallyl ammonium chloride.
17. The drilling fluid of claim 14 , wherein the cationic formation control additive comprises a copolymer of dimethyl diallyl ammonium chloride and about 1% to about 65% by weight acrylic acid or hydrolyzed acrylamide.
18. The drilling fluid of claim 14 , further comprising potassium formate.
19. The drilling fluid of claim 18 , wherein the potassium formate is generated in situ from potassium hydroxide and formic acid.
20. The drilling fluid of claim 14 , wherein a combined concentration of the cationic formation control additive and the choline chloride is at least 0.001% by weight of the well drilling fluid.