Oil absorbent oilfield materials as additives in oil-based drilling fluid applications

Patent metadata

Field	Value
Publication number	US-9701881-B2
Application number	US-201213527588-A
Country	US
Kind code	B2
Filing date	Jun 20, 2012
Priority date	Jun 20, 2012
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

A method using a single additive to modify or enhance one or more properties of a drilling fluid for drilling a wellbore in a subterranean formation, prevent lost circulation during the drilling, and/or increase bonding strength during cementing of the wellbore. The additive comprises an oil absorbent material comprising homopolymers or copolymers comprising styrene butadiene, acrylate, phthalate, and carbonate salts.

First claim

What is claimed is:

1. A method for modifying or enhancing one or more properties of a drilling fluid for drilling a wellbore in a subterranean formation, preventing lost circulation during the drilling, and/or increasing bonding strength during cementing of the wellbore, the method comprising adding to the drilling fluid an additive consisting of an oil absorbent material and drilling with the drilling fluid,
wherein the drilling fluid is an invert emulsion; and
wherein the oil absorbent material is a polymer selected from the group consisting of: styrene butadiene acrylate, styrene butadiene acrylate carbonate, a polymer comprising phthalate, a polymer comprising a fluorinated ether block amide, and a polymer comprising a perfluorinated ether block amide.

2. The method of claim 1 wherein the oil absorbent material increases low end rheological properties of the drilling fluid.

3. The method of claim 1 wherein the oil absorbent material is a viscosifier to the drilling fluid.

4. The method of claim 1 wherein the oil absorbent material enhances suspension properties of the drilling fluid.

5. The method of claim 1 wherein the oil absorbent material is a filtration control agent in the drilling fluid.

6. The method of claim 1 wherein the drilling fluid comprises at least one base oil selected from the group consisting of: a linear base oil, a cyclic base oil, an aliphatic base oil, an aromatic base oil, an olefinic base oil, and an esterified base oil.

7. The method of claim 1 wherein the viscosity of the drilling fluid increases with the quantity of oil absorbent material added thereto.

8. A method for modifying or enhancing one or more rheological properties of an oil-based drilling fluid for drilling a wellbore in a subterranean formation while also preventing lost circulation during the drilling, the method comprising adding to the drilling fluid during drilling an additive consisting of an oil absorbent material and continuing drilling with the drilling fluid; wherein the drilling fluid is an invert emulsion and wherein the oil absorbent material is a polymer selected from the group consisting of: styrene butadiene acrylate, styrene butadiene acrylate carbonate, a polymer comprising phthalate, a polymer comprising a fluorinated ether block amide, and a polymer comprising a perfluorinated ether block amide.

9. The method of claim 8 wherein the oil absorbent material increases the bonding strength during cementing of the wellbore.

10. A method for treating a wellbore in subterranean formation containing an oil comprising:
introducing an oil absorbent material into the wellbore, wherein the oil absorbent material is a polymer selected from the group consisting of: styrene butadiene acrylate, styrene butadiene acrylate carbonate, a polymer comprising phthalate, a polymer comprising a fluorinated ether block amide, and a polymer comprising a perfluorinated ether block amide;
allowing the oil absorbent material to absorb at least a portion of the oil in the wellbore; and
introducing cement into the wellbore after allowing the oil absorbent material to absorb at least the portion of the oil in the wellbore.

11. The method of claim 10 wherein the oil absorbent material increases the bonding strength of the cement.

Assignees

• Morris Kay Ann
• Miller Matthew Lynn
• Halliburton Energy Services Inc

Inventors

• Morris Kay Ann
• Miller Matthew Lynn

Classifications

• C09K8/032 Primary

  Inorganic additives · CPC title

• C04B28/02

  containing hydraulic cements other than calcium sulfates · CPC title

• C04B24/2676

  Polystyrenes · CPC title

• C09K8/467

  containing additives for specific purposes · CPC title

• C04B24/2682

  Halogen containing polymers, e.g. PVC · CPC title