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Retarder for high-temperature-resistant cement paste system

A technology for cement slurry and high temperature resistance, which is applied in the field of retarder of high temperature resistant cement slurry system, which can solve the problems of fast hydration speed of cement slurry, achieve good high temperature and salt resistance performance, enhance rigidity, and prolong thickening time Effect

Inactive Publication Date: 2017-12-01
四川宏升石油技术开发有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the hydration speed of cement slurry is fast at high temperature, and the purpose is to provide a retarder suitable for high temperature resistant cement slurry system to solve the problem of rapid hydration of cement slurry at high temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The present invention is applicable to the retarder of high temperature resistant cement slurry system, comprises following component: take 2-acrylamido-2-methylpropanesulfonic acid, acrylamide, maleic acid, itaconic acid as monomer, described The mass ratio of 2-acrylamido-2-methylpropanesulfonic acid: acrylamide: maleic acid: itaconic acid is: 18-24: 9-21: 6-12: 6-12, accounting for the total mass of the monomer 6%-8% of initiator, 3%-5% of borax in total monomer mass.

[0020] The present invention prolongs the thickening time of cement slurry at high temperature by preparing a retarder with high temperature resistance, thereby avoiding rapid hydration of cement slurry; different chemical functional groups play different roles in cement slurry solidification; amino, The carboxyl groups are easy to associate with water molecules through hydrogen bonds, and the hydrogen bonds between water molecules form a stable solvated water film on the surface of cement particles, ...

Embodiment 2

[0022] Based on the foregoing examples, the initiator is sodium bisulfite / ammonium persulfate initiator, and the molar ratio of sodium bisulfite / ammonium persulfate initiator is: 1:3. The sodium bisulfite / ammonium persulfate initiator is a redox system, and the initiation temperature of the redox system is low, which saves reaction time; the present invention uses deionized water as a solvent, which is low in cost and environmentally friendly; the initiator accounts for the total mass of the monomer 6%. Redox initiators are used in smaller amounts than other initiators. The borax accounts for 3% of the total mass of the monomer. Too much borax is not easy, and too much borax will affect the polymerization reaction of the organic retarder.

Embodiment 3

[0024] Based on the above examples, the mass ratio of 2-acrylamido-2-methylpropanesulfonic acid in the present invention: acrylamide: maleic acid: itaconic acid is 18:9:6:6; 6% of the total mass of the monomer, borax accounts for 3% of the total mass of the monomer; based on the above-mentioned proportioning, the present invention has carried out the test of the thickening time to the cement slurry under the conditions of 180 ° C and 50 MPa, and the results show that the cement slurry The thickening time is 243min, and the polymer has a good retarding effect.

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PUM

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Abstract

The invention discloses a retarder for a high-temperature-resistant cement paste system. The retarder comprises the following components: monomers consisting of 2-acrylamido-2-methylpropanesulfonic acid, acrylamide, maleic acid and itaconic acid in a mass ratio of (18-24): (9-21): (6-12): (6-12); an initiator accounting for 6%-8% of the total mass of the monomers; and monomer borax accounting for 3%-5% of the total mass of the monomers. A polymer formed by the above components is a quadripolymer which solves the problem of rapid hydration of cement paste at a high temperature; and the quadripolymer synthesized by using a simple synthetic process has better retarding effect compared with the same mass of a terpolymer or bipolymer.

Description

technical field [0001] The invention relates to a retarder, in particular to a retarder suitable for high temperature resistant cement slurry systems. Background technique [0002] At present, the development of high-temperature deep wells has become an important source of oil and gas production increase, and the cementing technology matched with high-temperature deep wells is also being continuously developed and improved. High-temperature deep well cementing is a complex systematic project. It is necessary to flexibly use the appropriate cementing technology according to the actual situation of the oil field, carefully evaluate all aspects of the cementing operation, and continuously develop new equipment, processes and materials; the development of new cementing materials is crucial to improving Cementing quality plays a very important role. [0003] As the temperature increases, the speed of water penetration into the surface of cement particles is accelerated, which in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467
CPCC09K8/467
Inventor 徐峰
Owner 四川宏升石油技术开发有限责任公司
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