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A high temperature resistant suspending agent for oil well cement

A technology of oil well cement and suspending agent, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of poor cement slurry stability, achieve high temperature stability, improve stability, and avoid low temperature excessive thickening Effect

Active Publication Date: 2017-11-21
TIANJIN BO XING ENG SCI & TECH LIMITED COMPANY OF CNPC +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a high-temperature-resistant suspending agent for oil well cement. The suspending agent can withstand temperatures up to 170°C, has good comprehensive performance, and can effectively solve the problem of poor cement slurry stability, thereby ensuring construction safety and improving cementing quality.

Method used

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  • A high temperature resistant suspending agent for oil well cement
  • A high temperature resistant suspending agent for oil well cement
  • A high temperature resistant suspending agent for oil well cement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Weigh 65 parts of 2-acrylamido-2-methylpropanesulfonic acid, 25 parts of acrylamide, and 5 parts of N,N-dimethylacrylamide in a beaker, stir to dissolve, and then add sodium hydroxide to adjust the pH of the solution= 7. Pour it into a cleaned three-necked bottle, add 5 parts of monomers containing hydrophobic groups, turn on the stirring and heating device, and fill it with nitrogen. When the system temperature reached 50°C, 0.6 part of initiator was added to initiate the polymerization reaction, and the reaction was stopped after 5 hours of constant temperature reaction. The synthetic product was washed with ethanol for purification, dried, and ground to obtain a solid powder. The drilling bentonite and the hydrophobically associated water-soluble polymer solid powder were mixed uniformly at a mass ratio of 5:1 to prepare a high-temperature-resistant suspension concentrate, which was marked as 1# sample.

Embodiment 2

[0018] Weigh 55 parts of 2-acrylamido-2-methylpropanesulfonic acid, 30 parts of acrylamide, and 5 parts of N,N-dimethylacrylamide, stir and dissolve in a beaker, then add sodium hydroxide to adjust the pH of the solution to 7 , poured into a cleaned three-necked bottle, then added 10 parts of monomers containing hydrophobic groups, turned on the stirring and heating device, and filled with nitrogen. When the system temperature reached 50°C, 0.6 part of initiator was added to initiate the polymerization reaction, and the reaction was stopped after 5 hours of constant temperature reaction. The synthetic product was washed with ethanol for purification, dried, and ground to obtain a solid powder. The drilling bentonite and the hydrophobically associated water-soluble polymer solid powder were mixed uniformly at a mass ratio of 5:1 to prepare a high-temperature-resistant suspension concentrate, which was marked as 2# sample.

[0019] Performance Evaluation of Prepared High Tempera...

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Abstract

The invention relates to a high-temperature-resistant suspending agent for oil well cement; it is prepared by compounding drilling bentonite and a hydrophobic association water-soluble polymer at a mass ratio of 5:1; the hydrophobic association compound is a quaternary copolymer synthesized by a soap-free emulsion polymerization method The mass ratio of polymerized monomers is: 35-80 parts of 2-acrylamide-2-methylpropanesulfonic acid, 10-60 parts of acrylamide, 5-10 parts of N,N-dimethylacrylamide, 5-20 parts of monomers containing hydrophobic groups; the high-temperature-resistant suspending agent can withstand temperatures up to 170°C, can effectively solve the stability problem of cement slurry, and does not over-thicken at low temperatures, nor over-dilutes at high temperatures, and has good comprehensive performance.

Description

technical field [0001] The invention relates to a cement admixture used in the cementing field of oil field completion technology, which is a high-temperature-resistant suspending agent and is mainly used for improving the stability of cement slurry and effectively controlling the free liquid of the cement slurry. Background technique [0002] Oil and gas wells need to be injected with cement before producing oil to achieve the purpose of isolating oil, gas and water layers, preventing fluids from flowing between formations, and protecting production layers. The cement injection operation requires that the cement slurry has good comprehensive properties to ensure safe construction and good sealing quality. The stability of cement slurry is one of the important performance indicators of cement slurry. Poor stability of cement slurry will cause the following hazards: (1) The compactness and bonding strength of cement stone will continue to weaken from top to bottom, which will...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/467C08F220/58C08F220/56C08F212/08C08F226/02C08F220/18C08F2/22
Inventor 卢海川邢秀萍谢承斌李立荣霍明江
Owner TIANJIN BO XING ENG SCI & TECH LIMITED COMPANY OF CNPC
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