Well drilling fluids
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 fluid of potassium formate together with a cationic formation control additive.
1. A well drilling fluid comprising potassium formate and a cationic formation control additive comprising tetramethylammonium chloride.
2. The well drilling fluid of claim 1 , wherein the potassium formate is generated in situ from potassium hydroxide and formic acid.
3. The well drilling fluid of claim 2 , wherein the cationic formation control additive and the potassium formate are present in a weight ratio from about 75:25 to about 25:75.
4. The well drilling fluid of claim 3 , wherein a combined concentration of the cationic formation control additive and the potassium formate is at least 0.001% by weight of the well drilling fluid.
5. An aqueous well drilling fluid comprising a cationic formation control additive and potassium formate, wherein the cationic formation control additive is a copolymer of dimethyl diallyl ammonium chloride and about 1% to about 65% by weight acrylic acid or hydrolyzed acrylamide.
6. The aqueous well drilling fluid of claim 5 , wherein the potassium formate is generated in situ from potassium hydroxide and formic acid.
7. The aqueous well drilling fluid of claim 6 , wherein a combined concentration of the cationic formation control additive and the potassium formate is at least 0.001% by weight of the aqueous well drilling fluid.
8. An aqueous well drilling fluid comprising a cationic formation control additive and potassium formate, wherein the cationic formation control additive is a homopolymer of dimethyl diallyl ammonium chloride.
9. The aqueous well drilling fluid of claim 8 , wherein the cationic formation control additive and the potassium formate are present in a weight ratio from about 75:25 to about 25:75.
10. An aqueous well drilling fluid comprising a cationic formation control additive and potassium formate, wherein the cationic formation control additive is an oligocationic compound.
11. The well drilling fluid of claim 7 , wherein the cationic formation control additive and the potassium formate are present in a weight ratio from about 75:25 to about 25:75.
12. The well drilling fluid of claim 8 , wherein the potassium formate is generated in situ from potassium hydroxide and formic acid.
13. The well drilling fluid of claim 12 , wherein a combined concentration of the cationic formation control additive and the potassium formate is at least 0.001% by weight of the well drilling fluid.
14. The well drilling fluid of claim 10 , wherein the potassium formate is generated in situ from potassium hydroxide and formic acid.
15. The well drilling fluid of claim 14 , wherein the cationic formation control additive and the potassium formate are present in a weight ratio from about 75:25 to about 25:75.
16. The well drilling fluid of claim 15 , wherein a combined concentration of the cationic formation control additive and the potassium formate is at least 0.001% by weight of the well drilling fluid.
17. The well drilling fluid of claim 10 , wherein the cationic formation control additive is a phosphonium compound.
18. The well drilling fluid of claim 17 , wherein the potassium formate is generated in situ from potassium hydroxide and formic acid.
19. The well drilling fluid of claim 18 , wherein the cationic formation control additive and the potassium formate are present in a weight ratio from about 75:25 to about 25:75.
20. The well drilling fluid of claim 19 , wherein a combined concentration of the cationic formation control additive and the potassium formate is at least 0.001% by weight of the well drilling fluid.
21. The well drilling fluid of claim 10 , wherein the cationic formation control additive is a sulfonium compound.
22. The well drilling fluid of claim 21 , wherein the potassium formate is generated in situ from potassium hydroxide and formic acid.
23. The well drilling fluid of claim 22 , wherein the cationic formation control additive and the potassium formate are present in a weight ratio from about 75:25 to about 25:75.
24. The well drilling fluid of claim 23 , wherein a combined concentration of the cationic formation control additive and the potassium formate is at least 0.001% by weight of the well drilling fluid.