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Tough cement slurry and its preparation method and application

A cement slurry and toughness technology, which is applied in the field of tough cement slurry and its preparation, can solve the problems of cement stone compressive strength reduction, etc., and achieve the effects of reducing brittleness, increasing deformation capacity, and improving cementing quality

Active Publication Date: 2022-03-01
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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  • Tough cement slurry and its preparation method and application
  • Tough cement slurry and its preparation method and application
  • Tough cement slurry and its preparation method and application

Examples

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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 part;

[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 th...

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 a tough cement slurry and its preparation method and application. In terms of parts by mass, the tough cement slurry includes: 100 parts of oil well cement; 33-40 parts of strength stabilizer; 0.3-0.5 parts of dispersant; 0.3-0.5 parts of suspending agent; 2 to 5 parts of antifoaming agent; 0.1 to 0.3 parts of defoaming agent; 30 to 60 parts of water; 1 to 3 parts of thermosetting phenolic resin; strength stabilizer includes microsilica fume and quartz sand, and the mass ratio of microsilica fume and quartz sand is ( 3-7): (30-33); the thermosetting phenolic resin is an A-stage liquid phenolic resin with a molecular weight of 300-1000 or a B-stage partially cured phenolic resin with a molecular weight of 2000-5000. After the cement slurry is thickened, the cement stone formed has high strength, low elastic modulus, and low permeability, which can meet the performance requirements of cement slurry for well cementing construction of gas storage wells and gas injection flooding production wells, and ensure the safety of 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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Patent Type & Authority Patents(China)
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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