High-temperature retarder suitable for oil and gas well cementation, preparation method thereof and cementing slurry

Patent metadata

Field	Value
Publication number	US-10858571-B2
Application number	US-202016752971-A
Country	US
Kind code	B2
Filing date	Jan 27, 2020
Priority date	Jan 28, 2019
Publication date	Dec 8, 2020
Grant date	Dec 8, 2020

Abstract

The present disclosure relates to a high-temperature retarder suitable for oil and gas well cementation, a preparation method thereof and a cementing slurry.

First claim

The invention claimed is:

1. A high-temperature retarder comprising a structural unit E shown in Formula (5), a structural unit B shown in Formula (2), a structural unit C shown in Formula (3) and a structural unit D shown in Formula (4);

wherein the molar percentages of structural units E, B, C and D are q, m, n and p, respectively, and p=7.18-10.76%, q=40.22-64.66%, m=25.86-46.25%, n=1.05-3.8%, and the sum of p, q, m, n is 1;
wherein R 9 , R 2 , R 3 and R 7 are the same or different, and each is independently H or a substituted or unsubstituted alkyl of C 1 -C 4 ;
wherein n in —(CH 2 ) n — of Formula (3) is 11, 13, 15, 17, 19 and 21.

2. The high temperature retarder of claim 1 , wherein R 9 , R 2 , R 3 and R 7 are identical or different, each is independently H, methyl, ethyl, n-propyl, isopropyl or butyl; the n in —(CH 2 ) n — of Formula (3) is 15, 17, 19 and 21.

3. The high temperature retarder of claim 2 , wherein each of R 9 , R 2 , R 3 and R 7 is independently H.

4. The high temperature retarder of claim 1 , wherein the weight average molecular weight of the high temperature retarder is within a range of 90000-210000.

5. The high temperature retarder of claim 4 , wherein the weight average molecular weight of the high temperature retarder is within a range of 110000-170000.

6. A cementing slurry comprising the high temperature retarder of claim 1 , wherein the dosage of the high temperature retarder is 0.2-2 wt % based on the total weight of the cementing slurry.

Assignees

• Univ China Petroleum East China
• Chengdu Omax Petroleum Tech Co Ltd

Inventors

• Wang Chengwen
• Xue Yucheng
• Zhou Wei
• Wang Ruihe
• Sun Jinsheng
• Li Yong
• Tang Changqiang

Classifications

• C09K8/467 Primary

  containing additives for specific purposes · CPC title

• C04B2111/763

  High temperatures · CPC title

• C04B2103/20

  Retarders · CPC title

• C04B28/04

  Portland cements · CPC title

• C04B28/02

  containing hydraulic cements other than calcium sulfates · CPC title