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Cement slurry with toughness and preparation method and application thereof

A cement slurry and toughness technology, which is applied in the field of tough cement slurry and its preparation, can solve the problems of reducing the compressive strength of cement stone, and achieve the effects of increasing the cohesive force, reducing the size of microcracks, and improving the cementing quality.

Active Publication Date: 2019-10-29
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The related technology provides that although the toughness of the cement stone can be improved by adding materials such as elastic materials, latex or fibers, it will lead to a decrease in the compressive strength of the cement stone

Method used

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  • Cement slurry with toughness and preparation method and application thereof
  • Cement slurry with toughness and preparation method and application thereof
  • Cement slurry with toughness and preparation method and application thereof

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preparation example Construction

[0081] In the second aspect, the embodiment of the present invention provides a method for preparing tough cement slurry, which is used to prepare the above tough cement slurry, which specifically includes the following steps:

[0082] Step S1, mixing 100 parts by mass of oil well cement, 33-40 parts by mass of strength stabilizer, 0.3-0.5 parts by mass of dispersant, 0.3-0.5 parts by mass of suspending agent and 1-3 parts by mass of thermosetting phenolic resin obtain the first mixture;

[0083] Step S2, uniformly mixing 2-5 parts by mass of fluid loss reducer, 0.2-3 parts by mass of coagulation regulator, 0.1-0.3 parts by mass of defoamer and 30-60 parts by mass of water to obtain a second mixture;

[0084] Step S3, uniformly mixing the first mixture and the second mixture to obtain tough cement slurry;

[0085] The strength stabilizer includes microsilica fume and quartz sand, and the mass ratio of microsilica fume and quartz sand is (3-7):(30-33).

[0086] Wherein, the t...

Embodiment 1

[0100] This embodiment provides a tough cement slurry. In parts by mass, the tough cement slurry includes the following components:

[0101] Grade G oil well cement, 100 parts;

[0102] Strength stabilizer, 33 parts, wherein, the mass ratio of silica fume and quartz sand is: 3:30;

[0103] Dispersant is aldehyde ketone polycondensate, 0.5 parts;

[0104] The suspending agent is a multi-polymer of acrylamide and acrylate, 0.5 part;

[0105] The coagulant is a compound of organic matter and inorganic matter, 3 parts;

[0106] The fluid loss reducer is a multi-component copolymer, 5 parts;

[0107] The defoamer is polyether, 0.2 parts;

[0108] A-stage liquid phenolic resin with a molecular weight of 300-1000, 1 part;

[0109] water, 52 parts.

[0110] The preparation method of the tough cement slurry is as follows: dry-mix oil well cement, strength stabilizer, dispersant, suspending agent, and A-stage liquid phenolic resin until uniform to obtain the first mixture; Mix t...

Embodiment 2

[0112] This embodiment provides a tough cement slurry. In parts by mass, the tough cement slurry includes the following components:

[0113] Grade G oil well cement, 100 parts;

[0114] Strength stabilizer, 33 parts, wherein, the mass ratio of silica fume and quartz sand is: 3:30;

[0115] Dispersant is aldehyde ketone polycondensate, 0.5 part;

[0116] The suspending agent is a multi-polymer of acrylamide and acrylate, 0.5 part;

[0117] The retarder is organic phosphate, 0.5 part;

[0118] The fluid loss reducer is a multi-component copolymer, 5 parts;

[0119] The defoamer is polyether, 0.2 parts;

[0120] B-stage partially cured phenolic resin with a molecular weight of 2000-5000, 2 parts;

[0121] water, 52 parts.

[0122] The preparation method of the tough cement slurry is: dry mixing oil well cement, strength stabilizer, dispersant, suspending agent, and B-stage partially cured phenolic resin to obtain the first mixture; The foaming agent and water were wet-mixed...

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Abstract

The invention discloses cement slurry with toughness and a preparation method and application thereof. The cement slurry with toughness is prepared from the components in parts by mass: 100 parts of oil well cement, 33-40 parts of a strength stabilizer, 0.3-0.5 part of a dispersing agent, 0.3-0.5 part of a suspending agent, 0.2-3 parts of a thickening time control agent, 2-5 parts of a fluid lossagent, 0.1-0.3 part of an antifoaming agent, 30-60 parts of water, and 1-3 parts of thermosetting phenolic resin; the strength stabilizer is prepared from silica fume and quartz sand, and the mass ratio of the silica fume to the quartz sand is (3 to 7) to (30 to 33); and the thermosetting phenolic resin is A-stage liquid phenolic resin with the molecular weight of 300-1,000 or B-stage partial cured phenolic resin with the molecular weight of 2,000-5,000. Set cement formed by the thickening of the cement slurry has high strength, low elastic modulus and low permeability, can meet the requirements of the performance of the cement slurry in gas storage well and gas injection drive oil well cementing construction, and ensures the safety of the cementing construction.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling engineering, in particular to a tough cement slurry and its preparation method and application. Background technique [0002] During the drilling of oil and gas wells, it is necessary to use cement slurry for cementing to support, suspend and protect the well wall, seal the underlying fluid, prevent interlayer channeling and casing corrosion, and at the same time play a role in sealing off oil, gas and water. Support casing and protect casing, prolong the life of oil and gas wells. For well cementing in the construction of gas storage and the use of gas flooding to enhance oil recovery, etc., the cement stone needs to withstand alternating loads, which puts forward higher requirements for the integrity of the wellbore seal. The compressive strength (1.88g / cm 3 The compressive strength is 40MPa ~ 50MPa) to resist the damage of external force, but also have strong toughness to resist el...

Claims

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Application Information

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IPC IPC(8): C04B28/00C09K8/42
CPCC09K8/42C04B28/00C04B2201/20C04B2201/50C04B18/146C04B14/06C04B24/30C04B24/2652C04B2103/12C04B24/24C04B2103/50C04B24/302C04B22/002C04B24/003
Inventor 王秀影谢刚胡书宝闫海俊张彬王元庆李冲
Owner PETROCHINA CO LTD
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