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Cement slurry system for preventing annular pressure of gas well and preparation method thereof

A cement slurry and system technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of harsh application environment of oil well cement, achieve the effect of adjustable thickening time, good stability, and improved flexibility

Inactive Publication Date: 2018-12-07
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application in construction cement shows that resin plays a good role in improving the mechanical properties and flexibility of cement materials, but the application environment of oil well cement is more harsh than that of construction cement, so the application of resin in oil well cement is less

Method used

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  • Cement slurry system for preventing annular pressure of gas well and preparation method thereof
  • Cement slurry system for preventing annular pressure of gas well and preparation method thereof
  • Cement slurry system for preventing annular pressure of gas well and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Prepare cement slurry according to the material weight ratio provided in Table 1, and the specific steps are as follows: take 100 parts by weight of cement, 4 parts by weight of polyacrylamide, 0.5 part by weight of polynaphthalene sulfonate, and dry mix 1 part by weight of micro silicon For dry powder, measure 44 parts by weight of fresh water, weigh 0.2 parts by weight of boric acid, 5 parts by weight of epoxy resin, 1 part by weight of diethylaminopropylamine, and dissolve in water 0.1 part by weight of dimethylaniline. Then put the mixed water into the mixing cup, use a corrugated stirrer to rotate at a low speed (4000±200r / min), and evenly add the weighed mixed dry powder within 15s. After all the mixed dry powder is poured into the mixed water, cover the lid of the mixing cup, and stir at high speed (12000±500r / min) for 35s±1s to prepare the elastic cement slurry system for preventing gas well annulus under pressure.

[0043] Specifically, the formula of the elastic...

Embodiment 2

[0046] Prepare cement slurry according to the material weight ratio provided in Table 2, and the specific steps are as follows: take 100 parts by weight of cement, 2.5 parts by weight of polyacrylamide, 1 part by weight of polynaphthalene sulfonate, and 1.5 parts by weight of microsilicon as dry powder. Take 44 parts by weight of fresh water, weigh 0.1 parts by weight of boric acid, 10 parts by weight of epoxy resin, 2 parts by weight of diethylaminopropylamine, and dissolve in water 0.2 parts by weight of dimethylaniline. Then put the mixed water into the mixing cup, use a corrugated stirrer to rotate at a low speed (4000±200r / min), and evenly add the weighed mixed dry powder within 15s. After all the mixed dry powder is poured into the mixed water, cover the lid of the mixing cup, and stir at high speed (12000±500r / min) for 35s±1s to prepare the elastic cement slurry system for preventing gas well annulus under pressure.

[0047] Specifically, the formula of the elastic ceme...

Embodiment 3

[0051] Prepare cement slurry according to the material weight ratio provided in Table 3, and the specific steps are as follows: take 100 parts by weight of cement, 2 parts by weight of polyacrylamide, 1 part by weight of polynaphthalene sulfonate, and 1.5 parts by weight of microsilicon as dry powder. 44 parts by weight of fresh water, 0.5 parts by weight of boric acid, 15 parts by weight of epoxy resin, 3 parts by weight of diethylaminopropylamine and 0.4 parts by weight of dimethylaniline were dissolved in water. Then put the mixed water into the mixing cup, use a corrugated stirrer to rotate at a low speed (4000±200r / min), and evenly add the weighed mixed dry powder within 15s. After all the mixed dry powder is poured into the mixed water, cover the lid of the mixing cup, and stir at high speed (12000±500r / min) for 35s±1s to prepare the elastic cement slurry system for preventing gas well annulus under pressure.

[0052] Specifically, the formulation of the elastic cement s...

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Abstract

The invention discloses a cement slurry system for preventing annular pressure of a gas well and a preparation method thereof. The elastic cement slurry system is prepared from the following components in percentage by weight: 2-4 percent of a fluid loss agent, 0.5-1.5 percent of a dispersant, 1-3 percent of a reinforcing agent, 5-20 percent of resin, 1-5 percent of a resin curing agent, 0.1-0.5 percent of a resin accelerant and 44 percent of fresh water, based on the mass of cement. The cement slurry system can be used for improving the performance of cement for resisting external load destruction, has zero free fluid, good stability, small filter loss and adjustable bodying time by being prepared from resin and mated additive materials, has the rheological property to meet the construction requirement, and can be used for remarkably improving the mechanical performance.

Description

technical field [0001] The invention belongs to the technical field of cement slurry preparation, and in particular relates to a cement slurry system for preventing gas well annulus from being pressurized and a preparation method thereof. Background technique [0002] Oil and gas well cementing is the process of injecting cement slurry into the annulus, the purpose is to achieve interlayer isolation, support and protect the casing. Oil well cement is the main component of cementing materials, and the cement stone formed is a brittle material with congenital microscopic defects. During the development of oil and gas wells, the destruction of the downhole cement sheath will inevitably weaken or lose the function of sealing underground oil, gas and water layers, causing interlayer channeling and corroding the casing, and in severe cases, the oil and gas well will be scrapped. With the extension of oil and gas well development time, development problems such as annular pressure...

Claims

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Application Information

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IPC IPC(8): C04B28/04C09K8/467
CPCC04B28/04C04B2111/00724C04B2201/50C09K8/467C04B22/002C04B24/2652C04B18/146C04B24/20C04B22/0013C04B24/281C04B24/121
Inventor 刘书杰许明标岳家平宋建建武治强王晓亮杨玉贵耿亚楠刘卫红
Owner CHINA NAT OFFSHORE OIL CORP