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Tough oil well cement

An oil well cement and toughness technology, which is applied in the field of tough cement, can solve the problems of the difference in elasticity and deformation between the cement sheath and the casing, loss of interlayer isolation and protective casing, high impact force and internal pressure of the cement sheath, etc., to achieve The effect of ensuring volume stability, improving compactness and fluidity, and stably increasing strength

Inactive Publication Date: 2017-01-04
JIAHUA SPECIAL CEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reservoirs of these oil and gas resources have high and complex in-situ stress, low casing centering will cause uneven cement sheath, and the impact force and internal pressure on the cement sheath during perforation and fracturing operations are large, which will easily lead to cracking and damage of the cement sheath
After the cement sheath is destroyed, it will lose the role of interlayer isolation and protective casing, which will seriously affect the fracturing effect and production capacity
[0003] At present, most oil and gas wells are developed by horizontal well staged fracturing technology, and staged fracturing will cause great damage to the cement sheath: First, there is a big difference in the elasticity and deformation capacity of the cement sheath and the casing. When the dynamic impact load generated by fracturing acts, the cement sheath is subject to greater internal pressure and impact force, causing the cement sheath to fracture radially; second, when the impact of fracturing operations is greater than the crushing and absorption energy of cement stones, the cement sheath will be broken

Method used

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  • Tough oil well cement

Examples

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Effect test

Embodiment 1

[0033] A tough oil well cement, consisting of the following components in parts by weight:

[0034] 100 parts of cement;

[0035] Active filler 1 part;

[0036] 1 part of toughening material;

[0037] Short fiber 0.01 part;

[0038] 1 part of admixture;

[0039] 0.1 parts of water reducing agent;

[0040] 1 part fluid loss reducer;

[0041] 1 part of defoamer;

[0042] 1 part retarder.

[0043] In the present invention, the cement is grade G oil well cement.

[0044] In the present invention, the active filler is fly ash, wherein the fly ash is Class I fly ash or Class II fly ash, and the fly ash has the particle characteristics of glass microspheres and potential chemical activity, which is helpful for reducing cement slurry Reduced water consumption, increased fluidity, improved compactness and later strength have excellent effects.

[0045] In the present invention, the toughening material is redispersible latex powder. The redispersible latex powder is flexible r...

Embodiment 2

[0050] A tough oil well cement, consisting of the following components in parts by weight:

[0051] 100 parts of cement;

[0052] 15 parts active filler;

[0053] 5 parts of toughening material;

[0054] Short fiber 0.05 part;

[0055] 5 parts of admixture;

[0056] 0.2 parts of water reducing agent;

[0057] 5 parts of fluid loss reducer;

[0058] 2 parts of defoamer;

[0059] 5 parts of retarder.

[0060] In the present invention, the cement is grade G oil well cement.

[0061] In the present invention, the active filler is fly ash, wherein the fly ash is Class I fly ash or Class II fly ash, and the fly ash has the particle characteristics of glass microspheres and potential chemical activity, which is helpful for reducing cement slurry Reduced water consumption, increased fluidity, improved compactness and later strength have excellent effects.

[0062] In the present invention, the toughening material is modified asphalt, and the modified asphalt is cationic emulsif...

Embodiment 3

[0067] A tough oil well cement, consisting of the following components in parts by weight:

[0068] 100 parts of cement;

[0069] 8 parts active filler;

[0070] 3 parts of toughening material;

[0071] Short fiber 0.03 part;

[0072] 3 parts of admixture;

[0073] 0.1 parts of water reducing agent;

[0074] 3 parts of fluid loss reducer;

[0075] 1 part of defoamer;

[0076] 3 parts retarder.

[0077] In the present invention, the cement is grade G oil well cement.

[0078] In the present invention, the active filler is fly ash, wherein the fly ash is Class I fly ash or Class II fly ash, and the fly ash has the particle characteristics of glass microspheres and potential chemical activity, which is helpful for reducing cement slurry Reduced water consumption, increased fluidity, improved compactness and later strength have excellent effects.

[0079] In the present invention, the toughening material is elastic particles, and the elastic particles are superfine natura...

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Abstract

The invention discloses tough oil well cement. The cement is characterized by being prepared from components in parts by weight as follows: 100 parts of cement, 1-15 parts of active filler, 1-5 parts of a toughening material, 0.01-0.05 parts of staple fibers, 1-5 parts of an additive, 0.1-0.2 parts of a water educing agent, 1-5 parts of a fluid loss agent, 1-2 parts of an antifoaming agent and 1-5 parts of a retarder. An oil well cement sheath is high in lateral deformation capacity, low in elasticity modulus, high in plastic yielding point and good in elasticity; the oil well cement ring has very high ultimate strain value, can absorb larger impact energy and greatly improves the deformation performance of set cement compared with raw slurry, so that the requirement for cement performance in the oil and gas well development process is met, and cementing quality and follow-up development are guaranteed.

Description

technical field [0001] The invention relates to the technical field of tough cement, in particular to a kind of tough oil well cement. Background technique [0002] With the deepening of oil and gas development, the resources of high-permeability oil-gas reservoirs are becoming less and less, while the proportion and scale of low-permeability and ultra-low-permeability oil and gas reserves in the total oil and gas reserves will become larger and larger. In the future, the effective development of low-permeability and ultra-low-permeability oil and gas resources will become an important relay object for the sustainable development of petroleum resources. However, the reservoir stress of these oil and gas resources is high and complex, and the low casing centering degree will cause the cement sheath to be uneven. After the cement sheath is destroyed, it will lose the role of interlayer isolation and protective casing, which will seriously affect the fracturing effect and prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B14/06C04B18/08C04B18/14C04B16/06
CPCY02W30/91
Inventor 王宁阳运霞王田堂曾雪玲古安林黎茜
Owner JIAHUA SPECIAL CEMENT
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