Oil-based drilling fluids for high pressure and high temperature drilling operations

Patent metadata

Field	Value
Publication number	US-10954425-B2
Application number	US-202016864230-A
Country	US
Kind code	B2
Filing date	May 1, 2020
Priority date	Aug 15, 2017
Publication date	Mar 23, 2021
Grant date	Mar 23, 2021

Abstract

Oil-based drilling fluid compositions comprising an oil phase comprising a base oil, an aqueous phase comprising water, at least one emulsifier, and one or more additives. The at least one emulsifier comprises an amino amide comprising the formula R—CO—NH—R′—NH2, where R is a fatty acid alkyl and R′ is an alkyl group. The one or more additives are chosen from a wetting agent, a rheology modifier, a fluid-loss control additive, and a weighting additive. Methods of making the oil-based drilling fluid compositions and methods of drilling a subterranean well utilizing the oil-based drilling fluid compositions are also provided.

First claim

The invention claimed is:

1. A method for drilling a subterranean well, the method comprising:
providing an oil-based drilling fluid composition; and
introducing the oil-based drilling fluid composition into a wellbore;
wherein the oil-based drilling fluid composition comprises:
an oil phase comprising a base oil;
an aqueous phase comprising water;
at least one emulsifier, in which the at least one emulsifier comprises an amino amide comprising the formula R—CO—NH—R′—NH 2 , where R is a fatty acid alkyl and R′ is an alkyl group selected from C 2 H 4 , C 6 H 12 or C 10 H 20 ; and
one or more additives chosen from a wetting agent, a rheology modifier, a fluid-loss control additive, and a weighting additive.

2. The method of claim 1 , in which the method further comprises operating a drill in the wellbore.

3. The method of claim 1 , in which the wellbore comprises a wellbore temperature greater than 300° F.

4. The method of claim 1 , in which the wellbore comprises a wellbore pressure greater than 10,000 psi.

5. The method of claim 1 , in which R is selected from C 15 H 31 , C 17 H 35 , C 21 H 43 or C 8 H 17 CHCHC 7 H 14 .

6. The method of claim 1 , in which the oil-based drilling fluid comprises from 10% by weight to 20% by weight base oil, based on the total weight of the oil-based drilling fluids.

7. The method of claim 1 , in which the oil-based drilling fluid comprises from 0.05% by weight to 5.0% by weight emulsifier, based on the total weight of the oil-based drilling fluids.

8. The method of claim 1 , in which the oil-based drilling fluid comprises from 0.1% by weight to 2.0% by weight wetting agent, based on the total weight of the oil-based drilling fluids.

9. The method of claim 1 , in which the oil-based drilling fluid comprises from 0.1% by weight to 2.0% by weight rheology modifier, based on the total weight of the oil-based drilling fluids.

10. The method of claim 1 , in which the oil-based drilling fluid comprises from 0.5% by weight to 2.0% by weight fluid-loss control additive, based on the total weight of the oil-based drilling fluids.

11. The method of claim 1 , in which the oil-based drilling fluid comprises from 3.0% by weight to 5.0% by weight brine solution, based on the total weight of the oil-based drilling fluids.

12. The method of claim 1 , in which the oil-based drilling fluid comprises from 64% by weight to 85.3% by weight weighting additive, based on the total weight of the oil-based drilling fluids.

13. The method of claim 1 , in which the viscosity of the oil-based drilling fluid composition at a shear rate of 10.22 s −1 measured at 50° C. is greater than 358 cP.

14. The method of claim 1 , in which the viscosity of the oil-based drilling fluid composition at a shear rate of 170 s −1 measured at 50° C. is less than 128 cP.

Assignees

• Saudi Arabian Oil Co
• Univ Durham
• M I Drilling Fluids Uk Ltd

Inventors

• Mohammed Musarrat Halima
• Whiting Andrew
• Greenwell Hugh Christopher
• Al Batal Mona
• Hall John Adrian
• Alabedi Gasan Selman
• Hodder Michael Hayward

Classifications

• C09K8/34

  Organic liquids · CPC title

• E21B21/003

  Means for stopping loss of drilling fluid (plastering the borehole wall E21B33/138) · CPC title

• C09K8/502

  Oil-based compositions · CPC title

• C09K8/36 Primary

  Water-in-oil emulsions · CPC title

• C09K8/035

  Organic additives · CPC title