In situ generation of nano-clay drilling fluid
US-2017275519-A1 · Sep 28, 2017 · US
Star-shaped polyacrylamide copolymer and preparation method thereof and drilling fluid including the copolymer
US10774256B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10774256-B2 |
| Application number | US-201816045198-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jul 25, 2018 |
| Priority date | Oct 23, 2017 |
| Publication date | Sep 15, 2020 |
| Grant date | Sep 15, 2020 |
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Abstract
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A star-shaped polyacrylamide copolymer and a preparation method thereof are provided, as well as a drilling fluid containing the star-shaped polyacrylamide copolymer. Only the star-shaped polyacrylamide copolymer is added into the drilling fluid; under a high-temperature environment, the filtration volume of the drilling fluid can be reduced, the high-temperature rheological property of the drilling fluid is improved, and the pressure loss of a circulation system of the drilling fluid is reduced.
First claim
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What is claimed is: 1. A star-shaped polyacrylamide copolymer, comprising a structure shown in Formula I: in Formula I is: wherein m is in a range of 25444 to 46390, and n is in a range of 1327 to 4543 in the Formula I, and wherein a viscosity-average molecular weight of the star-shaped polyacrylamide copolymer having a structure shown in Formula I is 10 million to 15 million. 2. A drilling fluid, comprising: a base mud; and a star-shaped polyacrylamide copolymer, having a structure shown in Formula I: in Formula I is: wherein m is in a range of 25444 to 46390, and n is in a range of 1327 to 4543 in the Formula I, wherein a viscosity-average molecular weight of the star-shaped polyacrylamide copolymer having a structure shown in Formula I is 10 million to 15 million, and wherein the base mud comprises distilled water, sodium bentonite and sodium carbonate. 3. The drilling fluid of claim 2 , wherein a mass percent of the star-shaped polyacrylamide copolymer having a structure shown in Formula I in the base mud is 0.1%-0.5%.
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Classifications
macromolecular compounds · CPC title
Acrylamide; Methacrylamide · CPC title
Homopolymers or copolymers of acrylamide or methacrylamide · CPC title
- C09K8/24Primary
Polymers · CPC title
Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a bond to sulfur or by a heterocyclic ring containing sulfur; Compositions of derivatives of such polymers · CPC title
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- What does patent US10774256B2 cover?
- A star-shaped polyacrylamide copolymer and a preparation method thereof are provided, as well as a drilling fluid containing the star-shaped polyacrylamide copolymer. Only the star-shaped polyacrylamide copolymer is added into the drilling fluid; under a high-temperature environment, the filtration volume of the drilling fluid can be reduced, the high-temperature rheological property of the dri…
- Who is the assignee on this patent?
- Univ China Geosciences Beijing
- 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 15 2020 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).