Polymeric Viscosifiers for use in Water-Based Drilling Fluids

Patent metadata

Field	Value
Publication number	US-2018010031-A1
Application number	US-201515021234-A
Country	US
Kind code	A1
Filing date	Mar 31, 2015
Priority date	Mar 31, 2015
Publication date	Jan 11, 2018
Grant date	—

Abstract

Systems and methods for drilling in a subterranean formation are disclosed. A method comprises providing a drilling fluid, wherein the drilling fluid comprises an aqueous fluid; a first polymer comprising 2-acrylamido-2-methylpropane sulfonic acid, vinylpyrrolidinone, pentaerythritol allyl ether, and methylenebisacrylamide; and a second polymer comprising acrylate. 2-acrylamido-2-methylpropane sulfonic acid, methacrylic acid, and allyloxy 2-hydroxy propane sulfonic acid. The method further comprises placing the drilling fluid into the subterranean formation and drilling a wellbore in the subterranean formation.

First claim

What is claimed is:

1 . A method for drilling in a subterranean formation:
providing a drilling fluid, wherein the drilling fluid comprises an aqueous fluid; a first polymer comprising 2-acrylamido-2-methylpropane sulfonic acid, vinylpyrrolidinone, pentaerythritol allyl ether, and methylenebisacrylamide; and a second polymer comprising acrylate, 2-acrylamido-2-methylpropane sulfonic acid, methacrylic acid, and allyloxy 2-hydroxy propane sulfonic acid; placing the drilling fluid into the subterranean formation; and drilling a wellbore in the subterranean formation.

2 . The method of claim 1 wherein the 2-acrylamido-2-methylpropane sulfonic acid is present in the first polymer in an amount of about 50 mol % to about 98 mol %, wherein the vinylpyrrolidinone is present in the first polymer in an amount of about 1 mol % to about 40 mol %, wherein the pentaerythritol allyl ether is present in the first polymer an amount of about 0.1 mol % to about 15 mol %, and wherein the methylenebisacrylamide is present in the first polymer in an amount of about 0.1 mol % to about 15 mol %.

3 . The method of claim 1 wherein the drilling fluid comprises the first polymer in an amount of about 0.1% to about 15% by weight of the drilling fluid.

4 . The method of claim 1 wherein the drilling fluid comprises the second polymer in an amount of about 0.1% to about 10% by weight of the drilling fluid.

5 . The method of claim 1 wherein the ratio of the first polymer to the second polymer is in a range of about 5:1 to about 1:5.

6 . The method of claim 1 wherein the aqueous fluid is present in the drilling fluid in an amount in the range of from about 33% to about 100% by weight of the drilling fluid.

7 . The method of claim 1 wherein the first polymer is a crosslinked polymer.

8 . The method of claim 1 wherein the drilling fluid further comprises a weighting agent.

9 . The method of claim 1 wherein the drilling fluid is substantially free of clay.

10 . The method of claim 1 wherein the subterranean formation has a temperature greater than 325° F.

11 . A drilling fluid comprising:
an aqueous fluid; a first polymer comprising 2-acrylamido-2-methylpropane sulfonic acid, vinylpyrrolidinone, pentaerythritol allyl ether, and methylenebisacrylamide; and a second polymer comprising acrylate, 2-acrylamido-2-methylpropane sulfonic acid, methacrylic acid, and allyloxy 2-hydroxy propane sulfonic acid.

12 . The drilling fluid of claim 11 wherein the 2-acrylamido-2-methylpropane sulfonic acid is present in the first polymer in an amount of about 50 mol % to about 98 mol %, wherein the vinylpyrrolidinone is present in the first polymer in an amount of about 1 mol % to about 40 mol %, wherein the pentaerythritol allyl ether is present in the first polymer an amount of about 0.1 mol % to about 15 mol %, and wherein the methylenebisacrylamide is present in the first polymer in an amount of about 0.1 mol % to about 15 mol %.

13 . The drilling fluid of claim 11 wherein the drilling fluid comprises the first polymer in an amount of about 0.1% to about 15% by weight of the drilling fluid.

14 . The drilling fluid of claim 11 wherein the drilling fluid comprises the second polymer in an amount of about 0.1% to about 10% by weight of the drilling fluid.

15 . The drilling fluid of claim 11 wherein the ratio of the first polymer to the second polymer is in a range of about 5:1 to about 1:5.

16 . The drilling fluid of claim 11 wherein the first polymer is a crosslinked polymer.

17 . The drilling fluid of claim 11 wherein the drilling fluid is substantially free of clay.

18 . A drilling system comprising:
a drilling fluid comprising an aqueous fluid; a first polymer comprising 2-acrylamido-2-methylpropane sulfonic acid, vinylpyrrolidinone, pentaerythritol allyl ether, and methylenebisacrylamide; and a second polymer comprising acrylate, 2-acrylamido-2-methylpropane sulfonic acid, methacrylic acid, and allyloxy 2-hydroxy propane sulfonic acid; a drilling assembly; a drill string coupled to the drilling assembly; a pumping system fluidically coupled to the drill string, wherein the pumping system is capable of pumping the drilling fluid through the drill string.

19 . The drilling system of claim 18 wherein the 2-acrylamido-2-methylpropane sulfonic acid is present in the first polymer in an amount of about 50 mol % to about 98 mol %, wherein the vinylpyrrolidinone is present in the first polymer in an amount of about 1 mol % to about 40 mol %, wherein the pentaerythritol allyl ether is present in the first polymer an amount of about 0.1 mol % to about 15 mol %, and wherein the methylenebisacrylamide is present in the first polymer in an amount of about 0.1 mol % to about 15 mol %.

20 . The drilling system of claim 18 wherein drilling fluid comprises the first polymer in an amount of about 0.1% to about 15% by weight of the drilling fluid and wherein the drilling fluid comprise the second polymer in an amount of about 0.1% to about 10% by weight of the drilling fluid.

Assignees

• Halliburton Energy Services Inc

Inventors

• Galindo Kay Ann
• Zha Weibin
• Deville Jay Paul

Classifications

• C09K8/12 Primary

  containing synthetic organic macromolecular compounds or their precursors · CPC title

• E21B21/003

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

• E21B21/065

  Separating solids from drilling fluids · CPC title