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US 2020/0399522 A1Published application
Drilling fluids that include water-soluble acid catalyst precursors or reaction products of such and uses for such drilling fluids
AssigneeSaudi Arabian Oil Company
InventorsVikrant Wagle, Abdullah Al-Yami, Nasser Alalhareth
Life of this patent
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Abstract
In accordance with one or more embodiments of the present disclosure, a drilling fluid may include a base fluid and one or more formaldehyde-based resins. The drilling fluid may further comprise one or more water-soluble acid catalyst precursors or the reaction products of such water-soluble acid catalyst precursors. The base fluid may include an aqueous or non-aqueous solution. The present disclosure also describes sealed subterranean petroleum formations that include such drilling fluids and methods for sealing subterranean wellbores by utilizing such drilling fluids.
Claims21
A drilling fluid comprising:
- a base fluid comprising an aqueous or non-aqueous solution;
- one or more formaldehyde-based resins, wherein the weight ratio of the one or more formaldehyde-based resins to the base fluid is from 1:100 to 50:100;
- optionally polyvinyl alcohol or vinyl alcohol copolymers, wherein if the polyvinyl alcohol or vinyl alcohol copolymers are present in the drilling fluid, the weight ratio of the sum of the polyvinyl alcohol or vinyl alcohol copolymers to the total weight of the drilling fluid is less than or equal to 1.5:100;
- one or more water-soluble acid catalyst precursors or the reaction products of such water-soluble acid catalyst precursors, wherein the weight ratio of the sum of the one or more water-soluble acid catalyst precursors and the reaction products of such water-soluble acid catalyst precursors to the total weight of the drilling fluid is from 0.5:100 to 20:100;
- and
- a basic additive comprising sodium hydroxide, potassium hydroxide, or both.
3 more elements
A sealed subterranean petroleum formation comprising:
- a subterranean wellbore positioned adjacent a subterranean petroleum formation;
- and
- a drilling fluid positioned in the subterranean wellbore, the drilling fluid comprising:
- a base fluid comprising an aqueous or non-aqueous solution;
- one or more formaldehyde-based resins, wherein the weight ratio of the one or more formaldehyde-based resins to the base fluid is from 1:100 to 50:100;
- optionally polyvinyl alcohol or vinyl alcohol copolymers, wherein if the polyvinyl alcohol or vinyl alcohol copolymers are present in the drilling fluid, the weight ratio of the sum of the polyvinyl alcohol or vinyl alcohol copolymers to the total weight of the drilling fluid is less than or equal to 1.5:100;
- one or more water-soluble acid catalyst precursors or the reaction products of such water-soluble acid catalyst precursors, the weight ratio of the sum of the one or more water-soluble acid catalyst precursors and the reaction products of such water-soluble acid catalyst precursors to the total weight of the drilling fluid is from 0.5:100 to 20:100;
- and
- a basic additive comprising sodium hydroxide, potassium hydroxide, or both.
6 more elements
-21. (canceled)
A drilling fluid comprising:
- a base fluid comprising an aqueous or non-aqueous solution;
- one or more formaldehyde-based resins, wherein the weight ratio of the one or more formaldehyde-based resins to the base fluid is from 1:100 to 50:100;
- optionally polyvinyl alcohol or vinyl alcohol copolymers, wherein if the polyvinyl alcohol or vinyl alcohol copolymers are present in the drilling fluid, the weight ratio of the sum of the polyvinyl alcohol or vinyl alcohol copolymers to the total weight of the drilling fluid is less than or equal to 1.5:100;
- and
- one or more water-soluble acid catalyst precursors or the reaction products of such water-soluble acid catalyst precursors, wherein the weight ratio of the sum of the one or more water-soluble acid catalyst precursors and the reaction products of such water-soluble acid catalyst precursors to the total weight of the drilling fluid is from 0.5:100 to 20:100, wherein the one or more water-soluble acid catalyst precursors comprise one or more of diethylene glycol di-formate, ethyl acetate, ethyl formate, ethylene glycol diacetate, diethylene glycol di-lactate, or combinations of these.
2 more elements
Dependencies are inferred from the claim text.