Polymer system for fluid loss control

Patent metadata

Field	Value
Publication number	US-10280354-B2
Application number	US-201615228823-A
Country	US
Kind code	B2
Filing date	Aug 4, 2016
Priority date	Aug 4, 2016
Publication date	May 7, 2019
Grant date	May 7, 2019

Abstract

A combination of three polymers including a crosslinked acrylamide-TBAS copolymers in inverse emulsion form, N-vinyl pyrrolidone-acrylamide-TBAS terpolymer, and crosslinked N-vinyl pyrrolidone-acrylamide-TBAS acts as high temperature, high pressure fluid loss control additives for water-based drilling fluids systems. The combination is particularly useful for high salt, high density drilling fluids, and high temperature applications.

First claim

What is claimed is:

1. A composition for fluid loss control from a water-based drilling fluid comprising
a first polymer comprising an acrylamide-NVP-2-acrylamide-2-methylpropanesulfonic acid terpolymer comprising
an acrylamide monomer at 30-80%;
a 2-acrylamide-2-methylpropanesulfonic acid monomer at 10-50%; and
a NVP monomer at 5-30%;

a second polymer comprising a crosslinked acrylamide-NVP-2-acrylamide-2-methylpropanesulfonic acid terpolymer comprising
an acrylamide monomer at 30-80%;
a 2-acrylamide-2-methylpropanesulfonic acid monomer at 10-50%;
an NVP monomer at 5-20%; and
a crosslinking monomer at 0.05%-0.5%; and

a third polymer comprising a crosslinked acrylamide-2-acrylamide-2-methylpropanesulfonic acid copolymer in inverse emulsion comprising
an acrylamide monomer at 30-80%;
a 2-acrylamide-2-methylpropanesulfonic acid monomer at 20-70%; and
a crosslinking monomer at 0.1-1%;
wherein the composition decreases the amount of fluid loss from a water-based drilling fluid.

2. The composition of claim 1 wherein the first polymer comprises an acrylamide-NVP-2-acrylamide-2-methylpropanesulfonic acid terpolymer comprising
an acrylamide monomer at 40-60%;
a 2-acrylamide-2-methylpropanesulfonic acid monomer at 25-40%; and
a NVP monomer at 10-20%.

3. The composition of claim 1 wherein the second polymer comprises a crosslinked acrylamide-NVP-2-acrylamide-2-methylpropanesulfonic acid terpolymer comprising
an acrylamide monomer at 40-60%;
a 2-acrylamide-2-methylpropanesulfonic acid monomer at 25-40%;
an NVP monomer at 10-20%; and
a crosslinking monomer at 0.1-0.3%.

4. The composition of claim 1 wherein the third polymer comprises a crosslinked acrylamide-2-acrylamide-2-methylpropanesulfonic acid copolymer in inverse emulsion comprising
an acrylamide monomer at 40-60%;
a 2-acrylamide-2-methylpropanesulfonic acid monomer at 40-50%; and
a crosslinking monomer at 0.3-0.6%.

5. The composition of claim 1 comprising
the first polymer comprising an acrylamide-NVP-2-acrylamide-2-methylpropanesulfonic acid terpolymer comprising
an acrylamide monomer at 40-60%;
a 2-acrylamide-2-methylpropanesulfonic acid monomer at 25-40%; and
a NVP monomer at 10-20%;

the second polymer comprising a crosslinked acrylamide-NVP-2-acrylamide-2-methylpropanesulfonic acid terpolymer comprising
an acrylamide monomer at 40-60%;
a 2-acrylamide-2-methylpropanesulfonic acid monomer at 25-40%;
an NVP monomer at 10-20%; and
a crosslinking monomer at 0.1-0.3%; and

the third polymer comprising a crosslinked acrylamide-2-acrylamide-2-methylpropanesulfonic acid copolymer in inverse emulsion comprising
an acrylamide monomer at 40-60%;
a 2-acrylamide-2-methylpropanesulfonic acid monomer at 40-50%; and
a crosslinking monomer at 0.3-0.6%.

6. The composition of claim 1 wherein the composition comprises 1-4 ppb of the first polymer, 2-6 ppb of the second polymer, and 1-4 ppb of the third polymer.

7. The composition of claim 1 wherein the composition comprises 1-4 ppb of the first polymer A, 1-4 ppb of the second polymer, and 1-4 ppb of the third polymer.

8. The composition of claim 1 wherein the composition comprises 1-4 ppb of the first polymer, 2-4 ppb of the second polymer, and 2-4 ppb of the third polymer.

9. A system for fluid loss control comprising
a water-based drilling fluid comprising
a first polymer comprising a acrylamide-NVP-2-acrylamide-2-methylpropanesulfonic acid terpolymer comprising
an acrylamide monomer at 30-80%;
a 2-acrylamide-2-methylpropanesulfonic acid monomer at 10-50%; and
a NVP monomer at 5-30%;

a second polymer comprising a crosslinked acrylamide-NVP-2-acrylamide-2-methylpropanesulfonic acid terpolymer comprising
an acrylamide monomer at 30-80%;
a 2-acrylamide-2-methylpropanesulfonic acid monomer 10-50%;
an NVP monomer at 5-20%; and
a crosslinking monomer at 0.05%-0.5%; and

a third polymer comprising a crosslinked acrylamide-2-acrylamide-2-methylpropanesulfonic acid copolymer in inverse emulsion comprising
an acrylamide monomer at 30-80%;
a 2-acrylamide-2-methylpropanesulfonic acid monomer at 20-70%; and
a crosslinking monomer at 0.1-1%.

10. The system of claim 9 wherein the water-based drilling fluid has a salt concentration between about 150,000 mg/L and 190,000 mg/L.

11. The system of claim 9 wherein the water-based drilling fluid provides fluid loss control at or above 300° F.

12. The system of claim 9 wherein the water-based drilling fluid provides fluid loss control at or above 15 ppg.

Assignees

• Cnpc Usa Corp

Inventors

• Lu Meng
• Huang Ping
• Wan Wei

Classifications

• C09K8/508

  macromolecular compounds {(C09K8/512 takes precedence)} · CPC title

• C09K8/512

  containing cross-linking agents · CPC title

• C08L41/00

  Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a bond to sulfur or by a heterocyclic ring containing sulfur; Compositions of derivatives of such polymers · CPC title

• C09K8/12 Primary

  containing synthetic organic macromolecular compounds or their precursors · CPC title

• C09K8/035

  Organic additives · CPC title