Casing pipe well cementing cement slurry system

A cement slurry and system technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., to achieve good thixotropic effect, reduce density, and control water loss

Inactive Publication Date: 2020-05-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, existing cement products can hardly meet the above requirements

Method used

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  • Casing pipe well cementing cement slurry system
  • Casing pipe well cementing cement slurry system
  • Casing pipe well cementing cement slurry system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1 A kind of cement slurry system for casing cementing

[0031] The cement slurry system consists of the following components:

[0032] Gelling system: 4 parts of G-grade oil well cement, 3 parts of fly ash, 3 parts of slag; 2.5% of polyvinyl alcohol type fluid loss reducer in the weight of the gelling system, 0.16% of the oxidizing agent in the weight of the gelling system Zinc, a sulfonated aldehyde-ketone type dispersant accounting for 0.25% by weight of the gelling system, a spherical hydrogel accounting for 20% by weight of the gelling system, and adding water at a ratio of 0.56 by mass ratio of water to the gelling system. The cement slurry system is denoted as C1

[0033] The preparation method of described cement slurry system is:

[0034] Dry mix G-grade oil well cement, slag, fly ash, polyvinyl alcohol type fluid loss reducer, sulfonated aldehyde ketone type dispersant and zinc oxide, and wet mix the mixing water and spherical polyacrylamide hydrog...

Embodiment 2

[0035] Embodiment 2 A cement slurry system for casing cementing

[0036] The cement slurry system consists of the following components:

[0037] Gelling system: 4 parts of G-grade oil well cement, 3 parts of fly ash, 3 parts of slag; 2.5% of polyvinyl alcohol type fluid loss reducer in the weight of the gelling system, 0.16% of the oxidizing agent in the weight of the gelling system Zinc, a sulfonated aldehyde-ketone type dispersant accounting for 0.25% by weight of the gelling system, and a spherical hydrogel accounting for 30% by weight of the gelling system, adding water at a ratio of 0.56 by weight of water to the gelling system. The cement slurry system is recorded as C2

[0038] The preparation method of the cement slurry system is as described in Example 1.

Embodiment 3

[0039] Embodiment 3 A cement slurry system for casing cementing

[0040] The cement slurry system consists of the following components:

[0041] Gelling system: 4 parts of G-grade oil well cement, 3 parts of fly ash, 3 parts of slag; 2.5% of polyvinyl alcohol type fluid loss reducer in the weight of the gelling system, 0.32% of the oxidizing agent in the weight of the gelling system Zinc, a sulfonated aldehyde-ketone type dispersant accounting for 0.25% by weight of the gelling system, a spherical hydrogel accounting for 20% by weight of the gelling system, and adding water at a ratio of 0.56 by mass ratio of water to the gelling system. The cement slurry system is recorded as C3

[0042] The preparation method of the cement slurry system is as described in Example 1.

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Abstract

The invention relates to the field of oilfield chemistry and oil-gas well cementing materials, relates to a casing pipe well cementing cement slurry system, and particularly relates to a well cementing cement slurry system with low density, low viscosity, strong thixotropy and long thickening time, which is suitable for a shallow layer. The system comprises a gelling system, a dewatering agent, zinc oxide, a dispersing agent, hydrogel and water. The cement slurry system disclosed by the invention not only has low viscosity and strong thixotropic property, but also has low density and long thickening time, and can meet the requirement of an annulus rotary grouting method on secondary well cementation of a free casing section.

Description

technical field [0001] The invention relates to the fields of oil field chemistry and oil and gas well cementing materials, and relates to a cement slurry system for casing cementing, in particular to a low-density-low-viscosity-strong thixotropy-long thickening time cementing suitable for shallow layers cement slurry system. Background technique [0002] Some wells in old oilfields have experienced more than ten, twenty or even thirty years of development and use, resulting in severe corrosion and deformation of casings in some oil and water wells, especially casings above the cement surface, affected by residual drilling fluid and formation Corrosion of seeping fluid and damage to some casings located at stress nodes are serious. Due to the damage of the casing, the water injection well cannot be injected normally, the energy of the corresponding oil well cannot be replenished, and the development plan cannot be implemented; the production well cannot produce normally, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467C09K8/487C04B28/02C04B111/70
CPCC04B28/02C04B2111/00706C04B2111/00724C04B2111/70C09K8/467C09K8/487C04B18/08C04B18/141C04B24/2623C04B14/30C04B24/16C04B24/2652
Inventor 袁杰徐加军吕建海谢文献项绍亮田雨滕腾徐忠王青王瑜
Owner CHINA PETROLEUM & CHEM CORP
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