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Retarder suitable for large-temperature-difference well cementation and preparation method thereof

A technology of retarder and large temperature difference, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as inability to set, slow development of cement slurry compressive strength, and inability to eliminate the influence of cement stone strength, etc., to achieve Increase the consistency of the slurry, wide temperature range, and good compatibility

Active Publication Date: 2021-06-18
JIAHUA SPECIAL CEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the defects and deficiencies in the above-mentioned prior art, the present invention provides a retarder suitable for large temperature difference cementing. Influenced by the rock strength, it is easy to cause the slow development of the compressive strength of the cement slurry in the low temperature area at the top of the well section, or even the problem that it cannot be condensed

Method used

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  • Retarder suitable for large-temperature-difference well cementation and preparation method thereof
  • Retarder suitable for large-temperature-difference well cementation and preparation method thereof
  • Retarder suitable for large-temperature-difference well cementation and preparation method thereof

Examples

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Embodiment 1

[0039] As a preferred embodiment of the present invention, this embodiment discloses:

[0040] Preparation of Terpolymer:

[0041] A1. Accurately weigh sodium methacrylate, prenol polyvinyl ether, and maleic anhydride in sequence according to the design ratio of each monomer; dissolve the three monomers weighed in pure water to obtain a three-monomer mixed solution ;

[0042] A2, using NaOH aqueous solution to adjust the pH value of the three-monomer mixed solution obtained in step A1 to 5, after fully mixing, transfer the three-monomer mixed solution after adjusting the pH value to a three-necked flask;

[0043] A3, feed nitrogen into the three-necked flask in step A2, get rid of oxygen;

[0044] A4. Using a constant pressure funnel device, the ammonium persulfate aqueous solution was added dropwise into a three-necked flask for reaction, the reaction temperature was 70°C, and the reaction time was 6h;

[0045]A5. After the reaction in step A4 is completed, wash out unreac...

Embodiment 2

[0049] As another preferred embodiment of the present invention, this embodiment discloses:

[0050] Preparation of Terpolymer:

[0051] A1. Accurately weigh sodium methacrylate, prenol polyvinyl ether, and maleic anhydride in sequence according to the design ratio of each monomer; dissolve the three monomers weighed in pure water to obtain a three-monomer mixed solution ;

[0052] A2, using NaOH aqueous solution to adjust the pH value of the three-monomer mixed solution obtained in step A1 to 5, after fully mixing, transfer the three-monomer mixed solution after adjusting the pH value to a three-necked flask;

[0053] A3, feed nitrogen into the three-necked flask in step A2, get rid of oxygen;

[0054] A4. Using a constant pressure funnel device, the ammonium persulfate aqueous solution was added dropwise into a three-necked flask for reaction. The reaction temperature was 75° C. and the reaction time was 6 hours;

[0055] A5. After the reaction in step A4 is completed, wa...

Embodiment 3

[0059] This example discloses a conventional cement slurry formula: G-grade cement 76.5% + silica sand 20% + suspension stabilizer 2% + fluid loss reducer 6% + citric acid 1.5%, water-cement ratio 0.44.

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Abstract

The invention discloses a retarder suitable for large-temperature-difference well cementation and a preparation method of the retarder, and relates to the technical field of materials for oil and gas well cementation. The retarder disclosed by the invention is prepared by mixing 10 to 30 percent of sodium ethylenediamine tetramethylene phosphonate, 10 to 20 percent of borax and 60 to 70 percent of a ternary polymer, and the ternary polymer is prepared by taking sodium methallyl sulfonate, isopentenol polyvinyl ether and maleic anhydride as monomers and adopting a free radical solution copolymerization method. The retarder has a wide use temperature interval, can meet the retarding effect on cement paste in the whole temperature interval that the temperatures of the upper end and the lower end of a cement paste injection well section in well cementation construction are 50 DEG C and 180 DEG C respectively, and can ensure that the cement has certain strength under the high-temperature large-temperature-difference environment of 50 DEG C at the top, and the super retarding phenomenon of the top cement is avoided.

Description

technical field [0001] The invention relates to the technical field of cementing materials for oil and gas wells, in particular to a retarder suitable for large temperature difference cementing and a preparation method thereof. Background technique [0002] As the reserves of oil and gas resources are reduced year by year, the exploration and development of oil and gas fields have been developed in the direction of deep wells, and it is necessary to develop drilling technologies and cementing processes that meet deep wells, ultra-deep wells and complex wells. High temperature and high pressure cement slurry technology has a very important impact on cementing construction. As the well depth increases, the temperature and pressure at the bottom of the well increase accordingly. A retarder needs to be added to the cement slurry system to adjust the thickening time, so as to ensure the safe and smooth progress of the cementing construction. At present, the retarders commonly us...

Claims

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Application Information

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IPC IPC(8): C09K8/467C04B24/16C08F283/06C08F228/02C08F222/06C04B103/22
CPCC09K8/467C04B40/0039C04B24/163C08F283/065C04B2103/22C04B24/12C04B22/08C08F228/02C08F222/06
Inventor 赵峰古安林曾雪玲龙丹
Owner JIAHUA SPECIAL CEMENT
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