Drill-in fluid compositions and methods
US-2019136110-A1 · May 9, 2019 · US
Treatment of calcium-containing bentonites for drilling fluids
US11530346B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11530346-B2 |
| Application number | US-202016881548-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 22, 2020 |
| Priority date | May 22, 2019 |
| Publication date | Dec 20, 2022 |
| Grant date | Dec 20, 2022 |
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Abstract
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Disclosed are methods of preparing drilling fluid compositions containing treated calcium bentonite. One such method includes mixing calcium bentonite with an aqueous mixture containing soda ash, followed by adding starch to form the treated bentonite mixture that is used to prepare a drilling fluid composition. Another method includes mixing the calcium bentonite with an aqueous mixture containing soda ash and magnesium oxide, followed by adding starch to form the treated bentonite mixture that is used to prepare a drilling fluid composition.
First claim
Opening claim text (preview).
We claim: 1. A method of preparing a treated bentonite mixture, the method comprising the steps of: a) mixing calcium bentonite and an aqueous mixture containing soda ash to form a first bentonite mixture, wherein the calcium bentonite contains 67 weight percent (wt %) of sodium montmorillonite, 10 wt % of kaolinite, and 23 wt % of quartz; then b) adding starch to the first bentonite mixture to form a second bentonite mixture; and then c) adding sodium hydroxide to the second bentonite mixture such that the pH is adjusted to a pH greater than 10 to form a treated bentonite mixture. 2. The method of claim 1 , wherein the step of a) mixing calcium bentonite and the aqueous mixture does not involve addition of hydroxide compounds. 3. The method of claim 1 , wherein the step of a) mixing calcium bentonite and the aqueous mixture does not involve addition of heavy metal salts. 4. A method of preparing a treated bentonite mixture, the method comprising the steps of: a) mixing calcium bentonite and an aqueous mixture containing soda ash to form a first bentonite mixture, wherein the calcium bentonite contains 64 weight percent (wt %) of sodium montmorillonite, 3 wt % of illite, 9 wt % of kaolinite, 21 wt % of quartz, 1 wt % of calcite and 2 wt % of hematite; then b) adding starch to the first bentonite mixture to form a second bentonite mixture; and then c) adding sodium hydroxide to the second bentonite mixture such that the pH is adjusted to a pH greater than 10 to form a treated bentonite mixture. 5. A method of preparing a treated bentonite mixture, the method comprising the steps of: a) mixing calcium bentonite and an aqueous mixture containing soda ash to form a first bentonite mixture, wherein the calcium bentonite contains 56 weight percent (wt %) of sodium montmorillonite, 4 wt % of illite, 8 wt % of kaolinite, 21 wt % of quartz, 2 wt % of albite and 9 wt % of hematite; then b) adding starch to the first bentonite mixture to form a second bentonite mixture; and then c) adding sodium hydroxide to the second bentonite mixture such that the pH is adjusted to a pH greater than 10 to form a treated bentonite mixture. 6. The method of claim 4 , wherein the step of a) mixing calcium bentonite and the aqueous mixture does not involve addition of hydroxide compounds. 7. The method of claim 4 , wherein the step of a) mixing calcium bentonite and the aqueous mixture does not involve addition of heavy metal salts. 8. The method of claim 5 , wherein the step of a) mixing calcium bentonite and the aqueous mixture does not involve addition of hydroxide compounds. 9. The method of claim 5 , wherein the step of a) mixing calcium bentonite and the aqueous mixture does not involve addition of heavy metal salts.
Assignees
Inventors
Classifications
- C04B28/001Primary
containing unburned clay (polymer binder - clay mixtures used in well cementing C09K8/44) · CPC title
Organic additives · CPC title
Clay; Kaolin · CPC title
Inorganic additives · CPC title
- C09K8/145Primary
characterised by the composition of the clay · CPC title
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- What does patent US11530346B2 cover?
- Disclosed are methods of preparing drilling fluid compositions containing treated calcium bentonite. One such method includes mixing calcium bentonite with an aqueous mixture containing soda ash, followed by adding starch to form the treated bentonite mixture that is used to prepare a drilling fluid composition. Another method includes mixing the calcium bentonite with an aqueous mixture contai…
- Who is the assignee on this patent?
- Saudi Arabian Oil Co
- What technology area does this patent fall under?
- Primary CPC classification C04B28/001. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Dec 20 2022 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 2 related publications on this page (citations in our corpus or others sharing the same primary CPC).