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Cement retardant and its application

A cement retarder and retarder technology, which is applied in the field of well cementing cement, can solve the problems such as the mechanism of retardation is not completely clear, and achieve the effect of realizing reproducibility, prolonging the thickening time and reducing the workload

Inactive Publication Date: 2007-01-03
天津恒信石油技术开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanism of action of retarding is not fully understood, even by those well versed in the field

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh various monomers according to the following proportions:

[0031] AMPS: itaconic acid: sodium hypophosphite = 35:50:15

[0032] Add 180% deionized water of the total amount of each monomer in the reactor, open the stirrer, then add the various monomers that have been weighed, and add 5% ammonium persulfate initiator of the total amount of the monomers, and reduce the temperature The reaction was controlled at 92°C for 2 hours to obtain a copolymer. Use HX-RM01 as the retarder code of the copolymer.

[0033] test

Embodiment 2

[0035] Weigh various monomers according to the following proportions:

[0036] AMPS: itaconic acid: sodium hypophosphite = 50:30:20

[0037] Add 230% deionized water of the total amount of each monomer in the reaction kettle, open the stirrer, then add various monomers that have been weighed, and add 0.5% ammonium persulfate initiator of the total amount of the monomers, and reduce the temperature The reaction was controlled at 65° C. for 4 hours to obtain a copolymer. HX-RM02 is used as the retarder code of the copolymer.

[0038] The performance of cement slurry mixed with embodiment 2 retarder under different test conditions in table 2

[0039] test

Embodiment 3

[0041] Weigh various monomers according to the following proportions:

[0042] AMPS: itaconic acid: sodium hypophosphite = 20:60:20

[0043] Add 200% deionized water of the total amount of each monomer in the reaction kettle, open the stirrer, then add various monomers that have been weighed, and add 3% ammonium persulfate initiator of the total amount of the monomers, and reduce the temperature The reaction was controlled at 85° C. for 3 hours to obtain a copolymer. HX-RM03 is used as the retarder code of the copolymer.

[0044] test

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PUM

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Abstract

The present invention belongs to the field of cement technology, and is especially one kind of cement retardant and its application. The cement retardant is prepared with 2-acrylamido -2-methyl propyl sulfonic acid 20-50 wt%, itaconic acid 30-70 wt% and sodium hypophoshorate 10-20 wt%, and through mixing to react while adding water in 180-230 wt% and ammonium persulfate in 0.5-4 wt% at 65-92 deg.c for 1-4 hr. The cement retardant is added into cement mortar and used at circulation temperature lower than 95 deg.c to prolong the thickening time of cement mortar effectively.

Description

technical field [0001] The invention belongs to the technical field of well cementing, in particular to a well cementing retarder and its application. Background technique [0002] In oil and gas well cementing operations and other underground cementing operations, it is usually required to inject cement slurry containing cement, water and admixtures into the predetermined formation underground through surface pumping equipment to seal the annulus between the formation and the casing. . Typically cement slurry is pumped into the casing and returns to the annulus through the gap between the casing and the formation. The cement slurry solidifies in the annular space to form a hard cement sheath column, which can form a bond with the formation and the casing. In order to achieve a satisfactory cementing operation, it is necessary to achieve a high-strength bond to prevent fluid channeling along or within the cement sheath, which would contaminat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/16C04B22/16C04B24/04C04B103/22
CPCC04B2103/22C04B24/163
Inventor 林恩平
Owner 天津恒信石油技术开发有限公司
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