A kind of retarder suitable for cementing with large temperature difference and preparation method thereof

A technology of retarder and large temperature difference, applied in chemical instruments and methods, drilling composition and other directions, can solve the problems of inability to eliminate the influence of cement stone strength, inability to set, slow development of compressive strength of cement slurry, etc. Wide use temperature range, increase slurry consistency, good compatibility

Active Publication Date: 2022-08-09
JIAHUA SPECIAL CEMENT
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of retarder suitable for cementing with large temperature difference and preparation method thereof
  • A kind of retarder suitable for cementing with large temperature difference and preparation method thereof
  • A kind of retarder suitable for cementing with large temperature difference and preparation method thereof

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Embodiment 1

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

[0040] Preparation of terpolymers:

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

[0042] A2, using the aqueous solution of NaOH 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, and exclude oxygen;

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

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

Embodiment 2

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

[0050] Preparation of terpolymers:

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

[0052] A2, using the aqueous solution of NaOH 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, and exclude oxygen;

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

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

Embodiment 3

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

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Abstract

The invention discloses a retarder suitable for cementing with a large temperature difference and a preparation method thereof, and relates to the technical field of cementing materials for oil and gas wells. The retarder of the present invention is prepared by mixing 10-30% sodium ethylenediamine tetramethylene phosphonate, 10-20% borax and 60-70% terpolymer; the terpolymer is methacrylic acid Sodium sulfonate, prenyl polyvinyl ether and maleic anhydride are used as monomers and are prepared by free radical solution copolymerization. The retarder of the invention has a wide range of use temperature, can meet the setting retardation effect of cement slurry in the entire temperature range of 50°C and 180°C at the upper and lower ends of the cement slurry well section in cementing construction, and can ensure that the Under the environment of high temperature and large temperature difference of 50 °C, the cement can have a certain strength and avoid the "super-retardation phenomenon" of the top cement.

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 cementing with large temperature difference and a preparation method thereof. Background technique [0002] As the reserves of oil and gas resources are decreasing year by year, the exploration and development of oil and gas fields has developed to the direction of deep wells, and it is necessary to develop drilling technologies and cementing techniques that meet the requirements of deep wells, ultra-deep wells and complex wells. High temperature and high pressure cement slurry technology has a very important influence on cementing construction. With the increase of well depth, the temperature and pressure at the bottom of the well increase, and a retarder needs to be added to the cement slurry system to adjust the thickening time, so as to ensure the safety and smooth progress of the cementing operation. At present, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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