Modified graphene shale inhibitors

Patent metadata

Field	Value
Publication number	US-11230657-B2
Application number	US-202016806804-A
Country	US
Kind code	B2
Filing date	Mar 2, 2020
Priority date	Mar 2, 2020
Publication date	Jan 25, 2022
Grant date	Jan 25, 2022

Abstract

A water-based wellbore fluid may include an aqueous base fluid and a modified graphene shale inhibitor that comprises one or more substituents that are covalently bonded to graphene via a linking group. One of the one or more substituents may be a hydrocarbon group that has a number of carbon atoms in the range from 8 to 14.

First claim

What is claimed is:

1. A water-based wellbore fluid, comprising:
an aqueous base fluid; and
a modified graphene shale inhibitor that comprises one or more substituents that are covalently bonded to graphene via a linking group,
wherein the modified graphene shale inhibitor is an undecanecarboxylate modified graphene.

2. The water-based wellbore fluid of claim 1 , wherein the water-based wellbore fluid has an apparent viscosity in the range from about 10 to 35 cP.

3. The water-based wellbore fluid of claim 1 , wherein the water-based wellbore fluid has a plastic viscosity in the range from about 1 to 25 cP.

4. The water-based wellbore fluid of claim 1 , wherein the water-based wellbore fluid has a yield point in the range from about 2 to 15 Pa.

5. The water-based wellbore fluid of claim 1 , further comprising one or more additives selected from the group consisting of weighting agents, viscosifiers, wetting agents, corrosion inhibitors, oxygen scavengers, anti-oxidants, biocides, surfactants, dispersants, interfacial tension reducers, pH buffers, mutual solvents, and thinning agents.

6. The water-based wellbore fluid of claim 1 , wherein the water-based wellbore fluid is a water-based drilling mud.

7. A method of drilling a wellbore, the method comprising:
circulating a water-based drilling mud as claimed in claim 1 into the wellbore while drilling.

8. The method of claim 7 , wherein the water-based drilling mud has one or more of the group consisting of:
an apparent viscosity in the range from about 10 to 35 cP;
a plastic viscosity in the range from about 1 to 25 cP; and
a yield point in the range from about 2 to 15 Pa.

9. The method of claim 7 , wherein the water-based drilling mud has one or more of the group consisting of:
a rolling recovery of shale cuttings of greater than 80%; and
an inhibition durability recovery of greater than 85% after 6 hours.

Assignees

• Saudi Arabian Oil Co
• Univ King Fahd Pet & Minerals

Inventors

• Saleh Tawfik Abdo
• Al-Arfaj Mohammed Khalid
• Rana Azeem A

Classifications

• C09K2208/12

  Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating · CPC title

• C09K8/22 Primary

  Synthetic organic compounds · CPC title

• C01B32/23

  Oxidation · CPC title

• C09K8/032 Primary

  Inorganic additives · CPC title