A kind of prechelated chitosan cementing cement slurry retarder and preparation method thereof

A technology for cementing cement slurry and chitosan, which is used in the field of downhole cementing slurry retarder and preparation, and the field of pre-chelated chitosan cementing cement slurry retarder and its preparation, which can solve the problem of limiting chitosan Application, flashing and thickening of cement slurry, etc., to achieve the effect of obvious right-angle thickening characteristics, low initial consistency, and solving the effect of flashing and thickening

Inactive Publication Date: 2015-10-14
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it can be seen from the cement slurry thickening experiment that the addition of chitosan will make the cement slurry flash and thicken, which limits the application of chitosan in cement slurry

Method used

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  • A kind of prechelated chitosan cementing cement slurry retarder and preparation method thereof
  • A kind of prechelated chitosan cementing cement slurry retarder and preparation method thereof
  • A kind of prechelated chitosan cementing cement slurry retarder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 1.75g ​​of chitosan with a degree of deacetylation of 92% and a particle size of 100-200 mesh and 2g of calcium hydroxide into 200g of water, stir, heat up to 70°C, chelate for 6 hours, cool to room temperature, and set aside. Code-named as sample 1.

Embodiment 2

[0025] Add 1.5g of chitosan with a degree of deacetylation of 92% and a particle size of 100-200 mesh and 1.5g of calcium hydroxide into 200g of water, stir, heat up to 65°C, chelate for 5 hours, cool to room temperature, and set aside. Code-named sample 2.

Embodiment 3

[0027] Add 2.0 g of chitosan with a degree of deacetylation of 92% and a particle size of 100 to 200 mesh and 2.5 g of calcium hydroxide into 200 g of water, stir, heat up to 75° C., chelate for 7 hours, cool to room temperature, and set aside. Code-named sample 3.

[0028] Evaluation of retarding performance of pre-chelated chitosan of the present invention:

[0029] Add a certain quality of water to the sample, and prepare cement slurry with a water-cement ratio of 0.44 according to the GB10238-88 standard. "Agent" was used to measure the thickening performance of the cement slurry added to the sample, and the results are shown in Table 1-3.

[0030] Table 1 Adding the cement slurry thickening performance of sample 1

[0031]

[0032] Table 2 Adding the cement slurry thickening performance of sample 2

[0033]

[0034] Table 3 Adding the cement slurry thickening performance of sample 3

[0035]

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Abstract

The invention discloses a method for preparing a pre-chelated chitosan well cemented slurry retarder. The method comprises the following steps of: adding chitosan and calcium hydroxide into water, stirring, raising the temperature to chelation temperature, chelating for a certain time, cooling, directly preparing cement slurry by using a mixed system of the pre-chelated chitosan, calcium hydroxide and water, wherein the chitosan granularity is 50-200 meshes, the addition amount of the calcium hydroxide is 0.2-4.0 percent of mass of water; and the addition amount of the chitosan is 0.1-4.0 percent of mass of water. According to the pre-chelated chitosan well cemented slurry retarder, the problem that the cement slurry is subjected to flash-setting and is thickened at the initial stage can be effectively solved, and the retarder is applied to well cementing at the temperature of 100 DEG C or below and is low in initial consistency, obvious in right-angle thickening characteristics and simple in preparation process.

Description

technical field [0001] The invention relates to a downhole cementing slurry retarder and a preparation method thereof, in particular to a pre-chelated chitosan cementing cement slurry retarder and a preparation method thereof. The invention belongs to the fields of oil field chemistry and oil and gas well cementing. The retarder prepared by the method is used in the cementing cement slurry of oil and gas wells to improve the thickening performance of the cement slurry. Background technique [0002] At present, the retarding mechanism of the approved cement slurry retarder mainly has the following four theories: [0003] (1) Adsorption theory: The retarder is adsorbed on the surface of cement particles to prevent cement particles from contacting with water. [0004] (2) Precipitation theory: The retarder reacts with ions in the cement slurry phase to form an impermeable membrane, which wraps on the surface of cement particles. [0005] (3) Nucleation theory: The retarder i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/467
Inventor 柳华杰步玉环路畅郭胜来
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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