Fluid loss control additive

Patent metadata

Field	Value
Publication number	US-2023174844-A1
Application number	US-202117643252-A
Country	US
Kind code	A1
Filing date	Dec 8, 2021
Priority date	Dec 8, 2021
Publication date	Jun 8, 2023
Grant date	—

Abstract

Fluid loss control additives for a cement slurry are provided. An exemplary fluid loss control additive includes a copolymer containing 2-acrylamido-2-methylpropane sulfonic acid monomer units and acryloylmorpholine monomer units, and a graft copolymer. The graft copolymer contains a humate and, grafted onto the humate, a side-chain polymer containing at least one of acrylamide monomer units, acryloylmorpholine monomer units, acrylic acid monomer units, and 2-acrylamido-2-methylpropane sulfonic acid monomer units.

First claim

What is claimed is:

1 . A fluid loss control additive comprising:
a copolymer comprising 2-acrylamido-2-methylpropane sulfonic acid monomer units and acryloylmorpholine monomer units; and a graft copolymer comprising a humate and, grafted onto the humate, a side-chain polymer comprising at least one of:
acrylamide monomer units;
acryloylmorpholine monomer units;
acrylic acid monomer units; and
2-acrylamido-2-methylpropane sulfonic acid monomer units.

2 . The fluid loss control additive of claim 1 , wherein the side-chain polymer comprises acryloylmorpholine monomer units and 2-acrylamido-2-methylpropane sulfonic acid monomer units.

3 . The fluid loss control additive of claim 1 , wherein:
the 2-acrylamido-2-methylpropane sulfonic acid monomer units comprise about 10% to about 90% of a total number of monomer units of the copolymer; and the acryloylmorpholine monomer units comprise about 10% to about 90% of a total number of monomer units of the copolymer.

4 . The fluid loss control additive of claim 1 , wherein:
the 2-acrylamido-2-methylpropane sulfonic acid monomer units comprise about 40% to about 80% of a total number of monomer units of the copolymer; and the acryloylmorpholine monomer units comprise about 20% to about 60% of a total number of monomer units of the copolymer.

5 . The fluid loss control additive of claim 1 , wherein:
the acrylamide monomer units comprise about 5% to about 85% of a total number of monomer units of the side-chain polymer; and the acryloylmorpholine monomer units comprise about 5% to about 85% of a total number of monomer units of the side-chain polymer.

6 . The fluid loss control additive of claim 1 , wherein:
the acrylamide monomer units comprise about 10% to about 40% of a total number of monomer units of the side-chain polymer; the acryloylmorpholine monomer units comprise about 5% to about 35% of a total number of monomer units of the side-chain polymer; the acrylic acid monomer units comprise about 10% to about 40% of a total number of monomer units of the side-chain polymer; and the 2-acrylamido-2-methylpropane sulfonic acid monomer units comprise about 20% to about 75% of a total number of monomer units of the side-chain polymer.

7 . The fluid loss control additive of claim 1 , wherein the humate comprises about 1 wt % to about 20 wt % of the graft copolymer.

8 . The fluid loss control additive of claim 1 , wherein the copolymer and the graft copolymer are present in the additive in a weight ratio of about 100:1 to about 1:100.

9 . The fluid loss control additive of claim 1 , wherein the copolymer and the graft copolymer are present in the additive in a weight ratio of about 4:1 to about 1:4.

10 . The fluid loss control additive of claim 1 , comprising:
about 20 wt % to about 80 wt % of the copolymer; and about 20 wt % to about 80 wt % of the graft copolymer.

11 . The fluid loss control additive of claim 1 , wherein the copolymer and the graft copolymer are present in a combined amount of at least about 80 wt % of the additive.

12 . A slurry, comprising:
water; a cement; a copolymer of 2-acrylamido-2-methylpropane sulfonic acid monomer units and acryloylmorpholine monomer units; and a graft copolymer comprising a humate and, grafted onto the humate, a side-chain polymer comprising at least one of:
acrylamide monomer units;
acryloylmorpholine monomer units;
acrylic acid monomer units; and
2-acrylamido-2-methylpropane sulfonic acid monomer units.

13 . The slurry of claim 12 , wherein the side-chain polymer comprises acryloylmorpholine monomer units and 2-acrylamido-2-methylpropane sulfonic acid monomer units.

14 . The slurry of claim 12 , wherein the cement comprises a Portland cement.

15 . The slurry of claim 12 , wherein the cement comprises a Portland cement and a slag cement.

16 . The slurry of claim 12 , wherein:
a weight of the copolymer present in the slurry is about 0.05% to about 10% of a weight of the cement present in the slurry; and a weight of the graft copolymer present in the slurry is about 0.05% to about 10% of the weight of the cement present in the slurry.

17 . The slurry of claim 12 , wherein:
a weight of the copolymer present in the slurry is about 0.1% to about 5% of a weight of the cement present in the slurry; and a weight of the graft copolymer present in the slurry is about 0.1% to about 5% of the weight of the cement present in the slurry.

18 . The slurry of claim 12 , further comprising an American Petroleum Institute (API) Class G cement.

19 . The slurry of claim 17 , wherein a weight of the API Class G cement present in the slurry is about 0.1% to about 35% of a weight of the cement present in the slurry.

20 . The slurry of claim 17 , wherein a weight of the API Class G cement present in the slurry is about 0.5% to about 10% of a weight of the cement present in the slurry.

21 . The slurry of claim 12 , further comprising at least one retarder, wherein a total weight of the at least one retarder is about 0.1% to about 35% of a weight of the cement present in the slurry.

22 . The slurry of claim 12 , further comprising:
zinc oxide; diethylenetriamine penta(methylene phosphonic acid); and a second copolymer comprising 2-acrylamido-2-methylpropane sulfonic acid monomer units and acrylic acid monomer units;
wherein:
a weight of the zinc oxide present in the slurry is about 0.1% to about 1% of a weight of the cement present in the slurry;
a weight of the diethylenetriamine penta(methylene phosphonic acid) present in the slurry is about 0.1% to about 1% of a weight of the cement present in the slurry; and
a weight of the second copolymer present in the slurry is about 0.1% to about 1% of the weight of the cement present in the slurry.

23 . The slurry of claim 12 , further comprising at least one superplasticizer, wherein a total weight of the at least one superplasticizer present in the slurry is about 0.1% to about 5% of a weight of the cement present in the slurry.

24 . The slurry of claim 12 , further comprising a polycarboxylate ether, wherein a weight of the polycarboxylate ether present in the slurry is about 0.1% to about 1.5% of a weight of the cement present in the slurry.

25 . The slurry of claim 12 , further comprising a defoamer, wherein a total weight of the defoamer is about 0.001% to about 0.2% of a weight of the cement present in the slurry.

26 . The slurry of claim 12 , wherein the cement and the water are present in the slurry in a weight ratio of about 3:1 to about 1:1.

27 . The slurry of claim 12 , further comprising an API Class G cement, wherein:
the cement comprises a Portland cement; a weight of the copolymer present in the slurry is about 0.05% to about 10% of a weight of the cement present in the slurry; a weight of the graft copolymer present in the slurry is about 0.05% to about 10% of the weight of the cement present in the slurry; a weight of the API Class G cement present in the slurry is about 0.1% to about 35% of the weight of the cement present in the slurry; and the cement and the water are present in the slurry in a weight ratio of about 3:1 to about 1:1.

28 . The slurry of claim 12 , comprising a fluid loss of about 0 mL per 30 min. to about 150 mL per 30 min., measured at an operating temperature of about 180° F. according t

Assignees

• Saudi Arabian Oil Co

Inventors

• Boul Peter
• Johnson Kenneth Dejuan

Classifications

• C04B2103/46

  Water-loss or fluid-loss reducers, hygroscopic or hydrophilic agents, water retention agents · CPC title

• C09K8/514

  of natural origin, e.g. polysaccharides, cellulose (C09K8/512 takes precedence) · CPC title

• C04B24/2647

  containing polyether side chains · CPC title

• C04B2103/0059

  Graft (co-)polymers · CPC title

• C04B2103/50

  Defoamers, air detrainers · CPC title