In situ generation of nano-clay drilling fluid
US-2017275519-A1 · Sep 28, 2017 · US
Crosslinked high molecular weight polymers for use in water-based drilling fluids
US10072197B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10072197-B2 |
| Application number | US-201514878754-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 8, 2015 |
| Priority date | Oct 8, 2015 |
| Publication date | Sep 11, 2018 |
| Grant date | Sep 11, 2018 |
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Abstract
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Crosslinked high molecular weight acrylamide and 2-acrylamido-2-methylpropane sulfonic acid copolymers in inverse emulsion form act as inhibitive and encapsulating agents for water-based drilling fluids system. The crosslinked copolymer are particularly useful for high salt, high density drilling fluids in high temperature and high pressure applications.
First claim
Opening claim text (preview).
What is claimed is: 1. A method of encapsulating a particulate matter in a water-based drilling fluid comprising having a water-based drilling fluid; adding a composition comprising a crosslinked high molecular weight acrylamide and 2-acrylamido-2-methylpropane sulfonic acid copolymer into the water-based drilling fluid, wherein the acrylamide is 50-95%; the 2-acrylamido-2-methylpropane sulfonic acid is 5-50%, and the crosslinker is 5-500 ppm; and encapsulating the particulate matter with the composition, wherein the particulate matter is shale cuttings. 2. The method of claim 1 wherein the copolymer concentration is 25-35%. 3. The method of claim 2 wherein the copolymer concentration is 30%. 4. The method of claim 1 wherein the acrylamide and 2-acrylamido-2-methylpropane sulfonic acid copolymer is crosslinked by N, N′-methylene-bis-acrylamide. 5. The method of claim 1 wherein an application dosage is 0.05-0.3%. 6. The method of claim 5 wherein the application dosage is 0.1%. 7. The method of claim 5 wherein the application dosage is 0.2%. 8. The method of claim 5 wherein the application dosage is 0.3%. 9. The method of claim 1 wherein the crosslinked high molecular weight acrylamide and 2-acrylamido-2-methylpropane sulfonic acid copolymer are in an inverse emulsion form. 10. The method of claim 1 wherein the specific viscosity of the solution of the crosslinked high molecular weight acrylamide and 2-acrylamido-2-methylpropane sulfonic acid copolymer does not change more than 20% after heating at 350° F. for 16 hours. 11. The method of claim 1 wherein the crosslinked high molecular weight acrylamide and 2-acrylamido-2-methylpropane sulfonic acid copolymer comprises 90% acrylamide and 10% 2-acrylamido-2-methylpropane sulfonic acid. 12. The method of claim 1 wherein the acrylamide is 80-95%. 13. The method of claim 1 wherein the 2-acrylamido-2-methylpropane sulfonic acid is 5-20%. 14. The method of claim 1 wherein the crosslinker is 5-200 ppm.
Assignees
Inventors
Classifications
Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating · CPC title
Polymerisation in water-in-oil emulsions · CPC title
- C09K8/24Primary
Polymers · CPC title
Organic additives · CPC title
- C08F220/56Primary
Acrylamide; Methacrylamide · CPC title
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Frequently asked questions
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- What does patent US10072197B2 cover?
- Crosslinked high molecular weight acrylamide and 2-acrylamido-2-methylpropane sulfonic acid copolymers in inverse emulsion form act as inhibitive and encapsulating agents for water-based drilling fluids system. The crosslinked copolymer are particularly useful for high salt, high density drilling fluids in high temperature and high pressure applications.
- Who is the assignee on this patent?
- Cnpc Usa Corp, Cnpc Chuanqing Drilling Eng Co
- What technology area does this patent fall under?
- Primary CPC classification C09K8/24. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Sep 11 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).