Low-end rheology modifier for oil based drilling fluids

Patent metadata

Field	Value
Publication number	US-11725129-B2
Application number	US-202217647280-A
Country	US
Kind code	B2
Filing date	Jan 6, 2022
Priority date	Jan 6, 2022
Publication date	Aug 15, 2023
Grant date	Aug 15, 2023

Abstract

Provided is an invert emulsion oil-based drilling fluid composition that may include an invert emulsion of an oil phase and an aqueous phase. The oil phase may include an oleaginous fluid. The composition may include a low-end rheology modifier that is a C-36 dimer diamine dihydrochloride salt. Further provided is a method that may include introducing the invert emulsion oil-based drilling fluid composition into a wellbore.

First claim

What is claimed:

1. An invert emulsion oil-based drilling fluid composition, comprising:
an invert emulsion of an oil phase and an aqueous phase, the oil phase including an oleaginous fluid; and
a low-end rheology modifier that is a C-36 dimer diamine dihydrochloride salt.

2. The composition of claim 1 , wherein the oleaginous fluid is one or more selected from the group consisting of a crude oil, a condensate, a light hydrocarbon liquid, a base oil, and diesel fuel.

3. The composition of claim 2 , wherein the base oil is one or more selected from the group consisting of a linear alpha olefin, a cycloparaffin, a linear paraffin, and an N-alkane.

4. The composition of claim 1 , wherein the aqueous phase comprises a saline agent.

5. The composition of claim 4 , wherein the saline agent is one or more selected from the group consisting of calcium chloride, calcium citrate, calcium acetate, calcium nitrate, and calcium bromide.

6. The composition of claim 1 , further comprising one or more selected from the group consisting of a weighting agent, barite; an alkaline source; an emulsifier; a filtration control agent; and a solid viscosifier.

7. The composition of claim 6 , wherein the alkaline source comprises calcium and is one or more selected from the group consisting of lime, calcium hydroxide, an alkyl-carboxylate salt, a phenoxide salt, a thiophenolate salt, a thiolate salt, and a cyanide salt.

8. The composition of claim 6 , wherein the emulsifier comprises a compound including a carboxylic acid functional group and a hydrocarbon.

9. The composition of claim 6 , wherein the filtration control agent comprises leonardite.

10. The composition of claim 6 , wherein the solid viscosifier is an organophilic clay-based viscosifier.

11. The composition of claim 1 , wherein the invert emulsion oil-based drilling fluid composition provides a stable rheological property including one or more selected from the group consisting of viscosity at one or more shear rate, plastic viscosity, yield point, low shear yield point, gel strength at one or more time period, and sag factor for a period up to about 96 hours.

12. The composition of claim 1 , wherein the viscosity relative to a shear rate is from 0.1 to 20 cP at 6 rpm.

13. The composition of claim 1 , wherein the plastic viscosity is in a range from 1 to 100 cP.

14. The composition of claim 1 , wherein the yield point is in a range from 1 to 100 lb/100 ft 2 .

15. The composition of claim 1 , wherein the low shear yield point is 7 lb/100 ft 2 or greater.

16. The composition of claim 1 , wherein the gel strength is in a range from 0.1 to 30 lb/100 ft 2 .

17. A method, comprising:
introducing the invert emulsion oil-based drilling fluid composition according to claim 1 into a wellbore,
wherein the wellbore has a temperature of up to 450° F. and a pressure of up to 30,000 pounds per square inch (psi).

18. The method of claim 17 , wherein the invert emulsion oil-based drilling fluid composition further comprises one or more selected from the group consisting of a saline agent; a weighting agent, barite; an alkaline source; an emulsifier; a filtration control agent; and a solid viscosifier.

Assignees

• Saudi Arabian Oil Co

Inventors

• Wagle Vikrant
• Alyami Abdullah
• Pal Omprakash
• Al-Safran Ali
• Alhelal Abdulaziz

Classifications

• C09K8/36 Primary

  Water-in-oil emulsions · CPC title

• E21B21/00

  Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor (freeing objects stuck in boreholes by flushing E21B31/03) · CPC title