Oil well cement high temperature resistance suspending agent

A technology of oil well cement and high temperature resistance, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of poor stability of cement slurry, etc., and achieve the effects of maintaining high temperature stability, improving stability, and strong high temperature suspension ability

Active Publication Date: 2015-12-30
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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  • Oil well cement high temperature resistance suspending agent
  • Oil well cement high temperature resistance suspending agent
  • Oil well cement high temperature resistance suspending agent

Examples

Experimental program
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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 an oil well cement high temperature resistance suspending agent. The oil well cement high temperature resistance suspending agent is prepared from well drilling bentonite and a hydrophobic association water-soluble polymer on the basis that the mass ratio is 5:1. A hydrophobic associated compound is a quadripolymer synthetized by adopting the soap-free emulsion polymerization method. A polymerization monomer comprises, by mass, 35-80 parts of 2-acrylamide-2-methyl propyl sulfonic acid, 10-60 parts of acrylamide, 5-10 parts of N,N-dimethyl acrylamide and 5-20 parts of a monomer containing hydrophobic groups. The high temperature resistance suspending agent can resist the temperature of 170 DEG C, the stability of cement slurry can be effectively achieved, the oil well cement high temperature resistance suspending agent cannot be excessively thickened at low temperature and cannot be excessively diluted at high temperature, and the comprehensive performance is good.

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 Applications(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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