Polymer-based latex for cementing fluids

Patent metadata

Field	Value
Publication number	US-2025313743-A1
Application number	US-202418626095-A
Country	US
Kind code	A1
Filing date	Apr 3, 2024
Priority date	Apr 3, 2024
Publication date	Oct 9, 2025
Grant date	—

Abstract

The present disclosure relates to cementing fluids including a latex and a cement. In an exemplary embodiments, the latex includes a first polymer and a second polymer; the first polymer includes at least about 80 mol % polyvinyl acetate; the second polymer has a general structure in which x is an overall molar ratio of styrene, y is an overall molar ratio of butadiene, and z is an overall molar ratio of carboxylic acid; a sum of x, y, and z is represented as s; styrene (x) is about 20% to about 30% of s; butadiene (y) is about 70% to about 80% of s; and carboxylic acid (z) is 0% to about 2% of s.

First claim

1 . A cementing fluid composition comprising:
a latex comprising a first polymer and a second polymer dispersed in water, wherein:
the first polymer comprises at least about 80 mol % polyvinyl acetate; and
the second polymer is derived from styrene and butadiene, and has the general structure:

wherein:
a sum of x, y, and z is equal to s,
x is about 20% to about 30% of s,
y is about 70% to about 80% of s, and
z is 0% to about 2% of s; and

a cement, wherein a concentration of the cement in the cementing fluid composition is about 50 wt % to about 80 wt %, and a concentration of the latex in the cementing fluid composition is about 1 wt % to about 15 wt %.

2 . The cementing fluid composition of claim 1 , wherein a molar concentration of polyvinyl alcohol in the first polymer is less than about 5 mol % of polyvinyl alcohol.

3 . The cementing fluid composition of claim 1 , wherein the first polymer is substantially free from polyvinyl alcohol.

4 . The cementing fluid composition of claim 1 , wherein a molar ratio of the first polymer to the second polymer in the cementing fluid composition is less than about 1.

5 . The cementing fluid composition of claim 4 , wherein a molar ratio of the first polymer to the second polymer in the cementing fluid composition is about 1:1.5 to about 1:5.

6 . The cementing fluid composition of claim 1 , wherein z is 0% to about 0.5% of s.

7 . The cementing fluid composition of claim 1 , wherein z is 0% of s.

8 . The method of claim 1 , wherein a concentration of the latex in the cementing fluid is about 4 wt % to about 12 wt %.

8 . (canceled)

9 . The cementing fluid composition of claim 1 , wherein a concentration of the cement in the cementing fluid is about 60 wt % to about 75 wt %.

10 . The cementing fluid composition of claim 1 , further comprising an additive comprising a starch, a cellulosic polymer, a dispersant, set retarder, silica, a fluid loss additive, an expanding additive, or any combination thereof.

11 . A method comprising:
providing a first polymer comprising at least about 80 mol % polyvinyl acetate; providing a second polymer having the general structure:

wherein:
a sum of x, y, and z is equal to s,
x is about 20% to about 30% of s,
y is about 70% to about 80% of s, and
z is 0% to about 2% of s; and

mixing the first polymer and the second polymer with a cement to form a cementing fluid.

12 . The method of claim 11 , wherein a molar concentration of polyvinyl alcohol in the first polymer is less than about 5 mol % of polyvinyl alcohol.

13 . The method of claim 11 , wherein providing the first polymer does not comprise hydrolysis of polyvinyl acetate into polyvinyl alcohol.

14 . The method of claim 11 , wherein a molar ratio of the first polymer to the second polymer in the cementing fluid composition is less than about 1.

15 . The method of claim 11 , wherein z is 0% to about 0.5% of s.

16 . The method of claim 11 , wherein providing the second polymer does not comprise carboxylation of a styrene-butadiene polymer.

17 . The method of claim 11 , wherein a combined concentration of the first polymer and the second polymer in the cementing fluid is about 1 wt % to about 15 wt %.

18 . The method of claim 11 , wherein a concentration of the cement in the cementing fluid is about 50 wt % to about 80 wt %.

19 . The method of claim 11 , wherein the cement comprises calcium oxide, silicon dioxide, aluminum oxide, iron oxide, and gypsum.

20 . The method of claim 11 , further comprising mixing an additive with the first polymer, second polymer, and cement to form the cementing fluid, wherein the additive comprises a starch, a cellulosic polymer, a dispersant, set retarder, silica, a fluid loss additive, an expanding additive, or any combination thereof.

21 . A method of cementing a wellbore, comprising:
flowing the cementing fluid composition of claim 11 through a tubular placed within a wellbore formed in a subterranean formation; flowing a displacement fluid through the tubular, thereby displacing the cementing fluid to at least partially fill an annular space defined between the tubular and the wellbore; and allowing the cementing fluid to harden in the annular space defined between the tubular and the wellbore.

22 . The cementing fluid composition of claim 1 , wherein the cement comprises calcium oxide, silicon dioxide, aluminum oxide, iron oxide, and gypsum.

Assignees

• Saudi Arabian Oil Co

Inventors

• Al-Yami Abdullah Saleh Hussain
• Al-Awadh Abdulla Hussein
• Bokhamsin Nada M
• Alhelal Abdulaziz
• Al Safran Ali Mohammed Hussain
• Wagle Vikrant
• Al-Dughaither Ahmed Nabil

Classifications

• C04B24/2676

  Polystyrenes · CPC title

• C04B24/2623

  Polyvinylalcohols; Polyvinylacetates · CPC title

• C09K8/467

  containing additives for specific purposes · CPC title

• E21B33/13

  Methods or devices for cementing, for plugging holes, crevices or the like · CPC title

• C04B28/02

  containing hydraulic cements other than calcium sulfates · CPC title