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A thermal viscosification and settlement stabilizer suitable for oil well cement slurry, its preparation method and application

An oil well cement slurry and stabilizer technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problem of increased settlement stability, cannot solve the problem of high temperature cement slurry settlement instability, and the stabilizer does not have the Thermal viscosity-increasing characteristics and other problems, to achieve the effect of solving the settlement instability

Active Publication Date: 2019-11-08
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cement slurry stabilizer can effectively improve the settlement stability of the slurry when the temperature is below 100°C, but the stabilizer does not have thermal viscosity-increasing characteristics, and it still cannot solve the problem of settlement instability of high-temperature cementing cement slurry
[0006] At present, there is still no good solution to the problem of cement slurry settlement instability, especially for high-temperature cement slurry systems, the difficulty of maintaining its settlement stability will increase

Method used

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  • A thermal viscosification and settlement stabilizer suitable for oil well cement slurry, its preparation method and application
  • A thermal viscosification and settlement stabilizer suitable for oil well cement slurry, its preparation method and application
  • A thermal viscosification and settlement stabilizer suitable for oil well cement slurry, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] A thermal viscosity-increasing settlement stabilizer suitable for oil well cement slurry, the settlement stabilizer has a structure shown in formula (II):

[0070] [C 6 h 7 o 2 (OH) 2 O-CH 2 CH 2 -OH] m -[C 6 h 7 o 2 (OH) 2 O-CH 2 CH 2 -O-C 12 h 25 ] n (II).

[0071] In formula (II), m:n=1:0.02, m+n=an integer of 200-250.

[0072] The preparation steps are as follows:

[0073] (1) Prepare 100 parts of sodium hydroxide solution with a mass fraction of 20%, pour it into a closed reaction vessel, and keep it at a constant temperature after being heated to 75°C; add 25 parts of high-purity cellulose to the reaction vessel, and magnetically stir Until the cellulose is completely dissolved, a uniform transparent viscous solution is finally obtained.

[0074] (2) Add 7 parts of sodium chloride solids to the above-mentioned uniform transparent viscous solution, at this moment a certain amount of macromolecular cellulose precipitates out from the solution, and t...

Embodiment 2

[0079] A thermal viscosity-increasing settlement stabilizer suitable for oil well cement slurry, the settlement stabilizer has a structure shown in formula (III):

[0080] [C 6 h 7 o 2 (OH) 2 O-CH 2 CH 2 -OH] m -[C 6 h 7 o 2 (OH) 2 O-CH 2 CH 2 -O-C 13 h 27 ] n (III).

[0081] In formula (III), m:n=1:0.02, m+n=an integer of 250-300.

[0082] The preparation steps are as follows:

[0083] (1) Prepare 100 parts of sodium hydroxide solution with a mass fraction of 15%, pour it into a closed reaction vessel, and keep it at a constant temperature after being heated to 70°C; add 25 parts of high-purity cellulose to the reaction vessel, and magnetically stir Until the cellulose is completely dissolved, a uniform transparent viscous solution is finally obtained.

[0084] (2) Add 6 parts of sodium chloride solids in the above-mentioned homogeneous transparent viscous solution, at this moment a certain amount of macromolecular cellulose precipitates out from the soluti...

Embodiment 3

[0089] A thermal viscosity-increasing settlement stabilizer suitable for oil well cement slurry, the settlement stabilizer has a structure shown in formula (IV):

[0090] [C 6 h 7 o 2 (OH) 2 O-CH 2 CH 2 -OH] m -[C 6 h 7 o 2 (OH) 2 O-CH 2 CH 2 -O-C 14 h 29 ] n (IV).

[0091] In formula (IV), m:n=1:0.025, m+n=an integer of 250-300.

[0092] The preparation steps are as follows:

[0093] (1) Prepare 100 parts of sodium hydroxide solution with a mass fraction of 25%, pour it into an airtight reaction vessel, and keep it at a constant temperature after being heated to 80°C; add 30 parts of high-purity cellulose to the reaction vessel, and magnetically stir Until the cellulose is completely dissolved, a uniform transparent viscous solution is finally obtained.

[0094] (2) Add 8 parts of sodium chloride solids in the above-mentioned homogeneous transparent viscous solution, at this moment a certain amount of macromolecular cellulose precipitates out from the solut...

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Abstract

The invention relates to a heat viscosity increasing settling stabilizer for oil well cement paste, a preparation method thereof and an application. The effective component has the structure shown as below: [C6H7O2(OH)2O-R1-OH]m-[C6H7O2(OH)2O-R1-O-R2]n, R1 is -CH2CH2 or CH(CH3)CH2-; R2 is long-chain alkyl, wherein m: n=1: (0.1-0.01), m+n=integer of 100-500. The cellulose is dissolved in alkali solution, and stirred evenly; then soluble salt is added to settle, separate out and filter the molecular weight cellulose; the cellulose is added in alkylene oxide to perform etherification reaction; the product performs hydrophobic modification reaction with long-chain halogenated alkane, the reaction solution is neutralized and filtered; the solid is washed and dried, thus the stabilizer is acquired. The settling stabilizer has the heat viscosity increasing property, and can realize the goal of 'not increasing viscosity under low temperature, and increasing thickness under high temperature' of the oil well cement paste.

Description

technical field [0001] The invention relates to a settlement stabilizer suitable for well cementing slurry, a preparation method and application thereof, and belongs to the technical field of oil and gas field development. Background technique [0002] With the continuous exploitation of conventional shallow oil and gas resources in my country, it is increasingly difficult to increase and stabilize production. Future oil and gas exploration and development will gradually develop in the direction of deep formations, oceans, and unconventional oil and gas. As the reservoir depth increases and the formation environment becomes more complex, deep wells, ultra-deep wells, extended-reach wells and horizontal wells are used more and more, which poses a challenge to the cementing engineering, especially the cementing slurry design. More challenges. For the drilling and development of deep oil and gas, with the increase of well depth, the pressure at the bottom of the well will cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/467C09K8/487C08B11/20C08B11/08
CPCC08B11/08C08B11/20C09K8/467C09K8/487
Inventor 王成文陈新王星星杨馥蔓王瑞和
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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