CN114716605B - Weak gelatinizing agent, preparation method thereof, cement slurry suspension stabilizer and application thereof - Google Patents

Weak gelatinizing agent, preparation method thereof, cement slurry suspension stabilizer and application thereof Download PDF

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CN114716605B
CN114716605B CN202110009555.2A CN202110009555A CN114716605B CN 114716605 B CN114716605 B CN 114716605B CN 202110009555 A CN202110009555 A CN 202110009555A CN 114716605 B CN114716605 B CN 114716605B
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cement slurry
reaction
slurry suspension
weak
agent
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CN114716605A (en
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吕斌
靳建洲
于永金
曲从锋
徐�明
齐奉忠
王兆会
张华�
张弛
刘子帅
周崇峰
郭玉超
丁志伟
夏修建
冯宇思
刘斌辉
纪宏飞
周琛洋
郭雪利
张晓兵
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China National Petroleum Corp
CNPC Engineering Technology R&D Co Ltd
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China National Petroleum Corp
CNPC Engineering Technology R&D Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/52—Amides or imides
    • C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
    • C08F220/56—Acrylamide; Methacrylamide
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/16—Sulfur-containing compounds
    • C04B24/161—Macromolecular compounds comprising sulfonate or sulfate groups
    • C04B24/163—Macromolecular compounds comprising sulfonate or sulfate groups obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F212/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring
    • C08F212/02—Monomers containing only one unsaturated aliphatic radical
    • C08F212/04—Monomers containing only one unsaturated aliphatic radical containing one ring
    • C08F212/14—Monomers containing only one unsaturated aliphatic radical containing one ring substituted by heteroatoms or groups containing heteroatoms
    • C08F212/30—Sulfur
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
    • C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
    • C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/0068—Ingredients with a function or property not provided for elsewhere in C04B2103/00
    • C04B2103/0082—Segregation-preventing agents; Sedimentation-preventing agents
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
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  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Structural Engineering (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)

Abstract

The invention provides a weak gelling agent, a preparation method thereof, a cement slurry suspension stabilizer and application thereof. The weak gelatinizer is obtained by initiating reaction of raw materials including sodium styrene sulfonate, itaconic acid, acrylic acid, N' -dimethyl acrylamide, N-isopropyl acrylamide or N-methylol acrylamide and N-vinyl pyrrolidone by an initiator. The weak gelatinizer can relieve dilution and viscosity reduction phenomena in well cementation construction. The invention also provides a cement slurry suspension stabilizer which comprises the tackifying and cutting agent and the weak gelling agent. The invention further provides application of the cement slurry suspension stabilizer in well cementation construction at the temperature of more than 200 ℃. The cement slurry suspension stabilizer can ensure the safety of cementing and well cementation under the working conditions of high temperature and ultra high temperature, and can improve the packing effect and well cementation quality of deep stratum.

Description

Weak gelatinizing agent, preparation method thereof, cement slurry suspension stabilizer and application thereof
Technical Field
The invention relates to the technical field of oil well cement additives in the fields of deep well, ultra-deep well drilling and completion and well cementation in the oilfield development process, in particular to a weak gelling agent and a preparation method thereof, a cement slurry suspension stabilizer and application thereof.
Background
Along with the gradual reduction of the development potential of shallow and medium shallow oil gas resources, the exploration and development directions of various large oil fields at home and abroad gradually expand to deep complex oil gas reservoirs, the number of deep wells and ultra-deep wells is continuously increased, and higher requirements on the construction performance and sealing quality such as the temperature resistance, rheological property and sedimentation stability of a well cementation cement slurry system are also provided.
The main purpose of well cementation is to seal an oil-gas water layer and a protective sleeve, and establish a smooth oil-gas recovery channel. The cement slurry system as the main body of the well cementation material is essentially composed of solid and liquid substances with different densities, different morphologies and different properties and comprises a sedimentation unstable system of multiphase coarse dispersion suspension. Under the high-temperature working condition, the Brownian motion of solid particles in a cement slurry system is accelerated, the dynamic and coalescence stability is destroyed, free liquid is increased, the density difference is increased, the risks of bridging, channeling and the like are present, and the cementing construction safety, the cementing quality and the later exploration and development effects of deep wells and ultra-deep wells are seriously affected.
At present, high-temperature-resistant oil well cement suspension stabilizer and anti-sedimentation agent products are mainly divided into the following main categories: firstly, inorganic materials such as silica fume, bentonite, sepiolite, superfine materials and the like are subjected to particle size distribution optimization to form flocculent substances through solid-phase bulk density or water absorption expansion, so that the system viscosity is increased, and the stability of cement slurry is improved; secondly, natural polymer materials such as xanthan gum, hotplate gum, guar gum and the like are utilized to improve the suspending capacity of cement slurry by utilizing the thickening property and pseudoplasticity of the natural polymer materials when meeting water; thirdly, artificially synthesizing a high polymer material, and improving the viscosity of a cement slurry system through hydrophilic groups (amide groups, carboxyl groups, carbonyl groups and the like) and higher molecular weight contained in a molecular chain, so as to prevent solid-phase particles from settling. However, the inorganic material has small particle size, large specific surface area, obvious thickening, and ash falling and difficult pumping of slurry when the adding amount is large; the natural polymer material has fluctuation in quality of different seasons and different batches of products, is easy to be thermally decomposed, has reduced viscosity and loses the suspension stabilizing effect. The synthetic polymer has stable performance and easy regulation, but the problems of serious low-temperature thickening and obvious dilution at ultra-high temperature (200 ℃) still commonly exist when the cement paste is added in large quantity, and the use temperature of the cement paste system is limited.
In summary, under the working conditions of high temperature and ultrahigh temperature, most of the existing oil well cement suspension stabilizers have the defects of easy sedimentation of solid phase particles when the addition amount is small, low-temperature viscosity and high-temperature dilution when the addition amount is large, and the comprehensive performance still has room for improvement and improvement. Therefore, by combining with research progress of chemistry and materialization, functional groups which can be chelated with high-valence metal cations to form weak gelatinous substances are introduced into a molecular structure, and the high-temperature-resistant suspension stabilizer with strong temperature resistance and good comprehensive performance is prepared, so that the high-temperature-resistant suspension stabilizer has important practical significance for ensuring the safety of well cementation construction and the development benefit of oil and gas resources.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a weak gelling agent and a preparation method thereof, a cement slurry suspension stabilizer and application thereof, wherein the weak gelling agent can alleviate dilution and viscosity reduction phenomena generated in well cementation construction; the cement slurry suspension stabilizer can ensure the safety of cementing and well cementation under the working conditions of high temperature and ultra high temperature, and can improve the packing effect and well cementation quality of deep stratum.
In order to achieve the above object, the present invention provides a weak gelling agent which is obtained by initiating a reaction by a raw material comprising 15 to 25 parts of an active ingredient and the balance of water, based on 100 parts by weight of the total raw material; wherein the active components comprise the following components in percentage by mass (16.6-22): (0.2-0.5): (15-17): (4.3-6.6): (1.4-1.8) Sodium Styrene Sulfonate (SSS), itaconic Acid (IA), acrylic Acid (AA), N' -Dimethylacrylamide (DMAA), and N-vinyl pyrrolidone (NVP); the active component also comprises N-isopropyl acrylamide (NIPAM) or N-methylol acrylamide (N-MAM), wherein the mass ratio of the N-isopropyl acrylamide or N-methylol acrylamide to sodium styrene sulfonate is (9.4-13): (16.6-22).
In a specific embodiment of the invention, the weak gelling agent is a polymer formed by polymerization of an active monomer component containing a carbon-carbon double bond (-c=c-) in a weak gelling raw material, wherein in the raw material, a benzene ring in sodium styrenesulfonate can increase the steric hindrance of the molecular structure of the polymer, and the rigidity and the temperature resistance of the polymer are improved; n-isopropylacrylamide, itaconic acid, acrylic acid, N' -dimethylacrylamide, N-methylolacrylamide (N-MAM) and sodium styrenesulfonate contain a large amount of carbonyl groups (-C=O), sulfonic acid groups (-SO) 3 - ) Amide group (-CONH) 2 ) And carboxyl (-COOH) and other groups with lone pair electrons, and the groups with lone pair electrons can be adsorbed, ion exchanged and chelated with metal ions to form gel substances with a certain space structure and interaction force.
In the weak gelling agent described above, the initiator preferably includes one or a combination of two or more of Ammonium Persulfate (APS), potassium persulfate (KPS), azo diiso Ding Mi hydrochloride (VA-044).
In the weak gellant described above, the raw materials preferably comprise 15 parts active ingredient and 85 parts water, based on 100% total weight of the raw materials.
In the weak gelling agent described above, the mass ratio of the N-isopropylacrylamide or N-methylolacrylamide to sodium styrenesulfonate may be (9.4 to 10.3): (16.6-22).
The polymer molecules polymerized by the weak gelatinizer raw materials can be used as a weak gel response component after being introduced into cement paste, and weak gel with a certain space structure and mechanical property can be gradually formed along with the continuous increase of the concentration of metal ions in the cement hydration process, so that the migration resistance of solid phase particles is increased, and the sedimentation is reduced. The rigid cyclic heterocycle in the N-vinyl pyrrolidone in the raw material monomer has good thermal stability and large steric hindrance, can protect the amide group, inhibit or delay the hydrolysis of the amide group, and improve the high temperature and ultra-high temperature resistance of the polymer. The dicarboxyl in the itaconic acid has higher charge property and stronger electronegativity, can improve the hydrophilicity and coordination property of the formed polymer, has lower reactivity ratio of the itaconic acid, can be used for adjusting the molecular weight of the polymer, reducing the sensitivity of weak gel components to metal ions, and avoids obvious thickening of slurry at low temperature and low metal ion concentration.
The invention also provides a preparation method of the weak gelling agent, which comprises the following steps: mixing sodium styrenesulfonate, N-isopropyl acrylamide or N-methylol acrylamide, itaconic acid, acrylic acid, N' -dimethyl acrylamide and N-vinyl pyrrolidone with water to obtain a mixed solution, introducing protective gas and adding an initiator to perform a first reaction; and then stopping introducing the protective gas and introducing air, and performing a second reaction to obtain the weak gelling agent. In the above process, the first reaction is a polymerization reaction, and the second reaction is an aging reaction for preventing the reactants from continuing to polymerize.
In the above-described method for producing a weak gelling agent, the shielding gas may include argon (may be high-purity argon) and/or nitrogen (may be high-purity nitrogen) or the like.
In the above-mentioned method for producing a weak gelling agent, the temperature of the first reaction is generally controlled to 45 to 60 ℃ (preferably 45 ℃), and the time of the first reaction is generally controlled to 6 to 7 hours.
In the above-mentioned method for producing a weak gelling agent, the temperature of the second reaction is generally controlled to 75 to 85 ℃ (preferably 80 ℃), and the time of the second reaction is 50 to 90 minutes (preferably 1 hour).
In the above-mentioned method for producing a weak gelling agent, the pH of the mixed solution is generally controlled to 6 to 7. In a specific embodiment, the pH of the mixed solution may be adjusted by a pH adjuster such as sodium hydroxide, hydrochloric acid, or the like.
The invention also provides a cement slurry suspension stabilizer, which comprises the tackifying and cutting agent and the weak gelling agent, wherein the mass ratio of the tackifying and cutting agent to the weak gelling agent is (1.7-2.2): 1.
in a specific embodiment of the present invention, the tackifying and cutting agent is generally obtained by initiating a reaction with an initiator from a raw material comprising 15 to 20 parts (preferably 18 parts) of an active component and the balance water, based on 100 parts by weight of the total tackifying and cutting agent raw material, the active component comprising (13 to 19.5) by mass: (18-26): (0.55-0.8): (15-22.5): (2.8-3.5) 2-acrylamido-2-methylpropanesulfonic Acid (AMPS), acrylamide (AM), maleic Anhydride (MAH), acrylic Acid (AA), and acryloyloxyethyl trimethyl ammonium chloride (DAC).
In a specific embodiment of the invention, the tackifying and cutting agent is a polymer formed by polymerization of active monomers containing carbon-carbon double bonds of a raw material of the tackifying and cutting agent, wherein 2-acrylamido-2-methylpropanesulfonic acid contains sulfonic acid groups, so that the thermal stability and salt tolerance of the molecular weight of the polymer can be improved; the acrylic acid and the acrylamide have high content in the tackifying and cutting agent, contain hydrophilic groups such as carboxyl, amido and the like, have high reactivity ratio, are favorable for improving the length of polymer molecular chains, and further can improve the viscosity of cement paste and realize suspension stability of solid phase particles; the maleic anhydride contains dicarboxyl and has good dispersibility, so that excessive increase of viscosity of the tackifying and cutting agent can be avoided; the introduction of the acryloyloxyethyl trimethyl ammonium chloride optimizes the charge distribution on a polymer molecular chain, reduces the influence on the cement paste setting time, endows the tackifying and cutting agent with certain weak gelation characteristics, assists in improving the cohesion between polymer molecules under the working conditions of high temperature and ultrahigh temperature, reduces the viscosity-temperature effect of the polymer, and further reduces the viscosity attenuation degree of the polymer at high temperature.
In the specific embodiment of the invention, the cement paste suspension stabilizer formed by the tackifying and cutting agent and the weak gelling agent is a polymer high-temperature (200 ℃) resistant cement paste suspension stabilizer with insignificant low-temperature thickening, small high-temperature dilution degree and good sedimentation stability. The cement slurry suspension stabilizer is suitable for oil well cement of various grades, not only can improve the low-temperature stability of cement slurry, but also can crosslink with metal cations (such as aluminum ions, iron ions and the like) released in the cement hydration process as nodes to form weak gelation with a certain space structure.
In particular embodiments of the present invention, the initiator used to prepare the adhesion promoting and cutting agent may include one or a combination of two or more of ammonium persulfate, potassium persulfate, and azobisiso Ding Mi hydrochloride.
In a specific embodiment of the present invention, the preparation method of the tackifying and cutting agent may include: mixing 2-acrylamide-2-methylpropanesulfonic acid, acrylamide, maleic anhydride, acrylic acid and acryloyloxyethyl trimethyl ammonium chloride with water to obtain a mixed solution, introducing protective gas and adding an initiator to perform a first reaction; and then stopping introducing protective gas and introducing air, and performing a second reaction to obtain the tackifying and cutting agent. In the above process, the first reaction is a polymerization reaction, and the second reaction is an aging reaction for preventing the reactants from continuing to polymerize.
In the above method for producing the tackifying and cutting agent, the shielding gas may be argon (may be high-purity argon) and/or nitrogen (may be high-purity nitrogen) or the like.
In the above method for producing the tackifying and cutting agent, the temperature of the first reaction is generally controlled to 45-55 ℃ (preferably 50 ℃), and the time of the first reaction is generally controlled to 4-5 hours.
In the above method for producing a tackifying and cutting agent, the temperature of the second reaction is generally controlled to 75 to 85 ℃ (preferably 80 ℃), and the time of the second reaction is generally controlled to 50 to 90 minutes (preferably 1 hour).
In the preparation method of the tackifying and cutting agent, the pH of the mixed solution is generally controlled to be 6-7. In a specific embodiment, the pH of the mixed solution may be adjusted by a pH adjuster such as sodium hydroxide, hydrochloric acid, or the like.
In a specific embodiment of the present invention, the cement slurry suspension stabilizer may be obtained by mixing the weak gelling agent and the tackifying and cutting agent. Specifically, the preparation method of the cement slurry suspension stabilizer can comprise the following steps:
1. preparing a tackifying and cutting agent: mixing 2-acrylamido-2-methylpropanesulfonic acid, acrylamide, maleic anhydride, acrylic acid and acryloyloxyethyl trimethyl ammonium chloride in water to obtain a mixed solution with a solute mass content of 15-20%, and regulating the pH of the mixed solution to 6-7 by adopting a pH regulator; introducing protective gas (argon, nitrogen and the like), adding an initiator, and reacting for 4-5h at 45-55 ℃; stopping introducing protective gas, introducing air, reacting at 75-85deg.C for 50-90 min, and cooling to obtain tackifying and cutting agent;
2. preparation of weak gellants: mixing sodium styrenesulfonate, N-isopropylacrylamide or N-methylol acrylamide, itaconic acid, acrylic acid, N' -dimethylacrylamide and N-vinyl pyrrolidone in water to obtain a mixed solution with the solute mass content of 15%, and regulating the pH value of the mixed solution to 6-7 by adopting a pH regulator; introducing protective gas (argon, nitrogen and the like), adding an initiator, and reacting for 6-7h at 45-55 ℃; stopping introducing protective gas, introducing air, reacting at 75-85deg.C for 50-90 min, and cooling to obtain weak gelatinizer;
3. weak gelling agent and tackifying and cutting agent are mixed according to (1.7-2.2): 1, and uniformly stirring to obtain a solution which is the cement slurry suspension stabilizer.
In the preparation method of the cement slurry suspension stabilizer, the processes of preparing the tackifying and cutting agent and preparing the weak gelling agent are respectively and independently carried out, the two processes are not mutually interfered, and the two processes can be synchronously carried out.
The invention further provides application of the cement slurry suspension stabilizer in well cementation construction at the temperature of more than 200 ℃. The cement slurry suspension stabilizer can ensure that free liquid (formed by adding the cement slurry into the suspension stabilizer) is reduced to 0 at 200 ℃ on the premise of low fluidity loss, good rheological property and low initial thickening, and the density difference of standing for 2h is controlled to be 0.020g/cm 3 In the meantime, the sedimentation stability of cement slurry under the working conditions of high temperature and ultra-high temperature is effectively improved, and the cement slurry has important practical significance for guaranteeing the cementing and well cementation construction safety of deep wells and ultra-deep wells and improving the well cementation quality.
The beneficial effects provided by the invention are as follows:
1. the weak gel provided by the invention has the characteristics of large molecular chain rigidity, various complexing groups and proper molecular weight, and can be crosslinked into weak gel with a certain space structure and mechanical property by taking high-valence metal cations (such as iron ions and aluminum ions) released by cement hydration as nodes. The weak gel can improve the interaction among substances in cement paste, and alleviate the dilution and viscosity reduction phenomena caused by the increase of temperature and the increase of molecular chain flexibility in high-temperature and ultrahigh-temperature well cementation construction.
2. The suspension stabilizer provided by the invention can ensure that the free liquid at 200 ℃ is reduced to 0 under the precondition of small loss of fluidity, good rheological property and low initial thickening, and the density difference of standing for 2h is controlled to be 0.020g/cm 3 In the meantime, the sedimentation stability of cement slurry under the working conditions of high temperature and ultra-high temperature is effectively improved, and the cement slurry has important practical significance for guaranteeing the cementing and well cementation construction safety of deep wells and ultra-deep wells, improving the packing effect and the well cementation quality of deep stratum and improving the well cementation quality.
Drawings
FIG. 1 is a thickening curve at 140℃for sample A of example 1.
FIG. 2 is a thickening curve at 140℃for sample C of example 3.
FIG. 3 is a thickening curve at 140℃for comparative example 1 sample E.
FIG. 4 is a thickening curve at 200℃for sample B of example 2.
FIG. 5 is a thickening curve at 200℃for sample D of example 4.
FIG. 6 is a thickening curve at 200℃for sample F of comparative example 2.
Detailed Description
The technical solution of the present invention will be described in detail below for a clearer understanding of technical features, objects and advantageous effects of the present invention, but should not be construed as limiting the scope of the present invention.
Example 1
The embodiment provides a cement slurry suspension stabilizer, which comprises a tackifying and cutting agent and a weak gelling agent, and specifically comprises the following steps:
1. preparing a tackifying and cutting agent:
1-1, pouring 4.38 parts of 2-acrylamide-2-methylpropanesulfonic acid, 7.46 parts of acrylamide and 0.19 part of maleic anhydride into a reactor, adding a certain amount of deionized water, and uniformly stirring to obtain a mixed solution;
1-2, adding 5.04 parts of acrylic acid into the mixed solution in the step 1-1 in parts by weight, and uniformly stirring;
1-3, adding 0.93 part of acryloyloxyethyl trimethyl ammonium chloride into the mixed solution in the step 1-2, adjusting the pH value of the mixed solution to 6 by adopting a sodium hydroxide aqueous solution, and supplementing a certain amount of deionized water to obtain a mixed solution with the solute mass content of 18%;
1-4, introducing nitrogen, adding ammonium persulfate as an initiator into the mixed solution obtained in the step 1-3, wherein the addition amount of the initiator is 0.1% of the total mass of the 2-acrylamido-2-methylpropanesulfonic acid, acrylamide, maleic anhydride, acrylic acid and acryloyloxyethyl trimethyl ammonium chloride, and stirring and reacting for 5 hours at 50 ℃; stopping introducing nitrogen, introducing air, stirring at 80 ℃ for reaction for 1h, and cooling to room temperature to obtain the tackifying and cutting agent.
2. Preparation of weak gellants:
2-1, pouring 6.71 parts of sodium styrene sulfonate, 3.8 parts of N-isopropyl acrylamide and 0.14 part of itaconic acid into a reaction vessel, adding deionized water, and uniformly stirring to obtain a mixed solution;
2-2, adding 2.07 parts of acrylic acid and 1.73 parts of N, N' -dimethylacrylamide into the mixed solution in the step 2-1 in parts by weight, and uniformly stirring;
2-3, adding 0.55 part by weight of N-vinyl pyrrolidone into the mixed solution in the step 2-2, adjusting the pH value of the mixed solution to 7 by adopting a sodium hydroxide solution, and supplementing a certain amount of deionized water to obtain the mixed solution with the solute mass content of 15%;
2-4, introducing nitrogen, adding potassium persulfate as an initiator, and stirring at 45 ℃ for reaction for 6 hours; stopping introducing nitrogen, introducing air, stirring at 80 ℃ for reaction for 1h, and cooling to room temperature to obtain a weak gelatinization agent;
3. weak gellant and viscosified cut-off according to 1.8:1, mixing and stirring evenly, and obtaining a solution which is the cement slurry suspension stabilizer and is marked as a sample A.
Example 2
The embodiment provides a cement slurry suspension stabilizer, which comprises a tackifying and cutting agent and a weak gelling agent, and specifically comprises the following steps:
1. preparing a tackifying and cutting agent:
1-1, pouring 5.47 parts of 2-acrylamide-2-methylpropanesulfonic acid, 5.97 parts of acrylamide and 0.20 part of maleic anhydride into a reactor, adding a certain amount of deionized water, and uniformly stirring to obtain a mixed solution;
1-2, adding 5.37 parts of acrylic acid into the mixed solution in the step 1-1 in parts by weight, and uniformly stirring;
1-3, adding 0.99 part of acryloyloxyethyl trimethyl ammonium chloride into the mixed solution in the step 1-2 by weight, adjusting the pH value of the mixed solution to 7 by adopting a sodium hydroxide aqueous solution, and supplementing a certain amount of deionized water to obtain a mixed solution with the solute mass content of 18%;
1-4, introducing nitrogen, adding potassium persulfate as an initiator into the mixed solution obtained in the step 1-3, wherein the addition amount of the initiator is 0.1% of the total mass of the 2-acrylamido-2-methylpropanesulfonic acid, acrylamide, maleic anhydride, acrylic acid and acryloyloxyethyl trimethyl ammonium chloride, and stirring and reacting for 4 hours at 50 ℃; stopping introducing nitrogen, introducing air, stirring at 80 ℃ for reaction for 1h, and cooling to room temperature to obtain the tackifying and cutting agent.
2. Preparation of weak gellants:
2-1, pouring 7.20 parts of sodium styrene sulfonate, 4.08 parts of N-isopropyl acrylamide and 0.15 part of itaconic acid into a reaction vessel, adding deionized water, and uniformly stirring to obtain a mixed solution;
2-2, adding 1.11 parts of acrylic acid and 1.86 parts of N, N' -dimethylacrylamide into the mixed solution in the step 2-1 in parts by weight, and uniformly stirring;
2-3, adding 0.59 part of N-vinyl pyrrolidone into the mixed solution in the step 2-2, adjusting the pH value of the mixed solution to 7 by adopting a sodium hydroxide solution, and supplementing a certain amount of deionized water to obtain the mixed solution with the solute mass content of 15%;
2-4, introducing nitrogen, adding azo diiso Ding Mi hydrochloride as an initiator, and stirring at 45 ℃ for reaction for 6 hours; stopping introducing nitrogen, introducing air, stirring at 80 ℃ for reaction for 1h, and cooling to room temperature to obtain a weak gelatinization agent;
3. weak gellants and tackifying and cutting agents were combined according to 2:1, mixing and stirring evenly, and obtaining a solution which is the cement slurry suspension stabilizer and is marked as a sample B.
Example 3
The embodiment provides a cement slurry suspension stabilizer, which comprises a tackifying and cutting agent and a weak gelling agent, and specifically comprises the following steps:
1. preparing a tackifying and cutting agent:
1-1, pouring 5.47 parts of 2-acrylamide-2-methylpropanesulfonic acid, 5.97 parts of acrylamide and 0.20 part of maleic anhydride into a reactor, adding a certain amount of deionized water, and uniformly stirring to obtain a mixed solution;
1-2, adding 5.37 parts of acrylic acid into the mixed solution in the step 1-1 in parts by weight, and uniformly stirring;
1-3, adding 0.99 part of acryloyloxyethyl trimethyl ammonium chloride into the mixed solution in the step 1-2 by weight, adjusting the pH value of the mixed solution to 6 by adopting a sodium hydroxide aqueous solution, and supplementing a certain amount of deionized water to obtain a mixed solution with the solute mass content of 18%;
1-4, introducing nitrogen, adding ammonium persulfate as an initiator into the mixed solution obtained in the step 1-3, wherein the addition amount of the initiator is 0.1% of the total mass of the 2-acrylamido-2-methylpropanesulfonic acid, acrylamide, maleic anhydride, acrylic acid and acryloyloxyethyl trimethyl ammonium chloride, and stirring and reacting for 4 hours at 50 ℃; stopping introducing nitrogen, introducing air, stirring at 80 ℃ for reaction for 1h, and cooling to room temperature to obtain the tackifying and cutting agent.
2. Preparation of weak gellants:
2-1, pouring 6.41 parts of sodium styrene sulfonate, 3.63 parts of N-isopropyl acrylamide and 0.1 part of itaconic acid into a reaction vessel, adding deionized water, and uniformly stirring to obtain a mixed solution;
2-2, adding 1.98 parts of acrylic acid and 2.31 parts of N, N' -dimethylacrylamide into the mixed solution in the step 2-1 in parts by weight, and uniformly stirring;
2-3, adding 0.59 part of N-vinyl pyrrolidone into the mixed solution in the step 2-2, adjusting the pH value of the mixed solution to 6 by adopting a sodium hydroxide solution, and supplementing a certain amount of deionized water to obtain the mixed solution with the solute mass content of 15%;
2-4, introducing nitrogen, adding azo diiso Ding Mi hydrochloride as an initiator, and stirring at 45 ℃ for reaction for 6 hours; stopping introducing nitrogen, introducing air, stirring at 80 ℃ for reaction for 1h, and cooling to room temperature to obtain a weak gelatinization agent;
3. weak gellant and viscosified cut-off according to 1.7:1, mixing and stirring evenly, and obtaining a solution which is the cement slurry suspension stabilizer and is marked as a sample C.
Example 4
The embodiment provides a cement slurry suspension stabilizer, which comprises a tackifying and cutting agent and a weak gelling agent, and specifically comprises the following steps:
1. preparing a tackifying and cutting agent:
1-1, pouring 5.47 parts of 2-acrylamide-2-methylpropanesulfonic acid, 5.97 parts of acrylamide and 0.20 part of maleic anhydride into a reactor, adding a certain amount of deionized water, and uniformly stirring to obtain a mixed solution;
1-2, adding 5.37 parts of acrylic acid into the mixed solution in the step 1-1 in parts by weight, and uniformly stirring;
1-3, adding 0.99 part of acryloyloxyethyl trimethyl ammonium chloride into the mixed solution in the step 1-2 by weight, adjusting the pH value of the mixed solution to 6 by adopting a sodium hydroxide aqueous solution, and supplementing a certain amount of deionized water to obtain a mixed solution with the solute mass content of 18%;
1-4, introducing nitrogen, adding azo diiso Ding Mi hydrochloride serving as an initiator into the mixed solution in the step 1-3, wherein the addition amount of the initiator is 0.1% of the total mass of the 2-acrylamido-2-methylpropanesulfonic acid, acrylamide, maleic anhydride, acrylic acid and acryloyloxyethyl trimethyl ammonium chloride, and stirring and reacting for 5 hours at 50 ℃; stopping introducing nitrogen, introducing air, stirring at 80 ℃ for reaction for 1h, and cooling to room temperature to obtain the tackifying and cutting agent.
2. Preparation of weak gellants:
2-1, pouring 6.26 parts of sodium styrene sulfonate, 3.55 parts of N-methylol acrylamide and 0.16 part of itaconic acid into a reaction vessel, adding deionized water, and uniformly stirring to obtain a mixed solution;
2-2, adding 2.90 parts of acrylic acid and 1.61 parts of N, N' -dimethylacrylamide into the mixed solution in the step 2-1 in parts by weight, and uniformly stirring;
2-3, adding 0.52 part of N-vinyl pyrrolidone into the mixed solution in the step 2-2, adjusting the pH value of the mixed solution to 7 by adopting a sodium hydroxide solution, and supplementing a certain amount of deionized water to obtain the mixed solution with the solute mass content of 15%;
2-4, introducing nitrogen, adding potassium persulfate as an initiator, and stirring at 45 ℃ for reaction for 6 hours; stopping introducing nitrogen, introducing air, stirring at 80 ℃ for reaction for 1h, and cooling to room temperature to obtain a weak gelatinization agent;
3. weak gellant and tackifying and cutting agent were mixed according to 2.2:1, mixing and stirring evenly, and obtaining a solution which is the cement slurry suspension stabilizer and is marked as a sample D.
Comparative example 1
This comparative example differs from the cement slurry suspension stabilizer in example 2 in that the weak gelling agent in example 2 was not contained, i.e., only the tackifying and shear-promoting agent in example 2 was used as the cement slurry suspension stabilizer, which was designated as sample E.
Comparative example 2
This comparative example differs from the cement paste suspension stabilizer in example 2 in that the tackifying and shear-promoting agent in example 2 was not included, i.e., only the weak gelling agent in example 2 was used as the cement paste suspension stabilizer, and was designated as sample F.
The G-class cement used in the following test was a High Sulfate Resistance (HSR) -type G-class cement, and the manufacturer was a extra heavy cement Co., ltd; the quartz sand is 200 meshes, and is a product produced by Hongrun quartz silica micropowder company; the adopted defoaming agent is tributyl phosphate; the adopted micro silicon is a 851 type high-purity product produced by Hebei Lingshou county gold source mining industry processing factories; the adopted dispersing agent is a ketoaldehyde oil well cement dispersing agent, and the manufacturer is Chengdu Chuan Feng chemical engineering Limited liability company, and the model is SXY; the weighting material is fine iron ore powder, and the manufacturer is Hebei Lingshou county Shunyuan mining powder factory, 20-80 meshes; the retarder adopted was the high temperature resistant copolymer oil well cement retarder described in example 2 in application number 201410643111.4 (title of the invention: a high temperature resistant copolymer oil well cement retarder and preparation method thereof).
Test example 1
And evaluating the free liquid, density difference, thickening performance and rheological performance of the mixed slurry formed by mixing the samples A-F and the oil well cement according to the national standard GB/T19139-2012 oil well cement test method. The test temperature is 140 ℃, the test pressure is 70MPa, and the heating time is 55min.
The formula of the mixed slurry formed by mixing the cement slurry suspension stabilizer A-F and cement slurry is as follows: oil well cement, quartz sand, micro silicon, retarder, dispersant, cement slurry suspension stabilizer, weighting material and distilled water. The consumption of distilled water is determined according to the density requirement of the cement slurry, and the final density of the cement slurry is controlled to be 1.90 multiplied by 10 3 -2.10×10 3 kg/m 3 。
The samples prepared in each example and comparative example were heated to 140℃and cured for 30 minutes using a high temperature and high pressure thickener, and then placed in a water bath at 90℃and a curing kettle at 140℃and cured for 2 hours and 24 hours, respectively, and the specific compositions of each mixed slurry and the performance evaluation of each suspension stabilizer at 140℃are shown in Table 1.
TABLE 1
As can be seen from Table 1, the density of the cement slurry system formed by samples A-D was 1.9g/cm at an experimental temperature of 140℃and a suspension stabilizer addition of 2.5 parts 3 The fluidity is more than 22cm, the rheological property is good, the initial thickening is more than 23Bc, and the thickening time is long.
Wherein, the ratio of the tackifying and cutting agent to the weak gelling agent in the sample A is 1.8:1, the content of 2-acrylamide-2-methylpropanesulfonic acid in the tackifying and cutting component is low (accounting for 24.4 percent of the total weight of the tackifying and cutting agent), and the content of acrylic acid and acrylamide is high (accounting for 69.4 percent of the total weight of the tackifying and cutting agent); the weak gellant has a relatively low content of N-vinylpyrrolidone (3.7% by weight of the total weak gellant active monomer), and high contents of acrylic acid, N' -dimethylacrylamide and N-isopropylacrylamide (50.7% by weight of the total weak gellant active monomer); so the initial thickening of the cement slurry system is relatively slightly higher, the consistency of the slurry is reduced along with the extension of thickening time (as shown in figure 1), the fluidity of the cement slurry system is smaller at normal temperature, the fluidity index is larger, and the density difference is slightly increased at high temperature.
The proportion of the tackifying and cutting component to the weak gelling agent of the sample C is 1.7:1, and the content of the 2-acrylamide-2-methylpropanesulfonic acid in the tackifying and cutting component is higher (accounting for 33.2 percent of the total weight of the tackifying and cutting agent); the weak gelatinizer contains N-vinyl pyrrolidone 3.9 wt% of active monomer, and acrylic acid, N' -dimethyl acrylamide and N-isopropyl acrylamide 28.8 wt%; after cement paste is added, the system has high normal temperature fluidity and good rheological property, the initial thickening is 16Bc, and the consistency gradually increases along with the thickening time (as shown in figure 2), which is related to high complex group content, more formed gel substances and increased binding capacity to cement particles and free water.
Comparative example 1 is a suspension stabilizer containing no weak gellant and only the tackifying and cutting agent prepared in example 2. Comparing the results of the sample test of comparative example 1 with that of example 2, it can be seen that the sample E of comparative example 1 had a primary thickening of 23Bc and a thick slurry formed (as shown in FIG. 3) after the weak gelling agent was removed, the fluidity index reached 0.95, the consistency coefficient was reduced from 0.3 of sample B to 0.23, and the rheological properties were deteriorated as compared with sample B.
Comparative example 2 is a suspension stabilizer containing no tackifying and shear-enhancing agent and only the weak gelling agent prepared in example 2. As can be seen from comparing the results of the test of the samples of comparative example 2 with those of example 2, the sample F of comparative example 2 has low initial thickening of only 13Bc, thinner slurry, small fluidity index, high consistency coefficient, good fluidity, but poor suspension stability after the tackifying and cutting agent is removed.
Sample B-1 and sample B-2 were obtained by increasing the proportions of the polymer high temperature resistant suspension stabilizer, the dispersant and the weighting material based on sample B prepared in example 2. The cement paste system density of the sample B-1 and the sample B-2 is respectively improved to 2.00g/cm 3 And 2.10g/cm 3 The fluidity of the slurry is respectively reduced by 5.2 percent and 8.4 percent, the thickening time is shortened by 5 minutes and 14 minutes, the fluidity index is increased by 4.7 percent, the viscosity degree of the slurry is increased, and the effect is related to iron ions in the iron concentrate powder which is a weighting material.
Sample E of comparative example 1 had good suspension stability at 140 ℃; sample F of comparative example 2 had a large density difference of 0.025g/cm, respectively 3 And 0.041g/cm 3 The suspension stabilizing effect is poor. This result demonstrates that the addition of the tackifying and shear-enhancing agent to the suspension stabilizer has a greater impact on the suspension stabilizing effect.
Test example 2
The samples prepared in each example and comparative example were heated to 200℃and cured for 30 minutes using a high temperature and high pressure thickener, and then placed in a water bath at 90℃and a curing kettle at 200℃and cured for 2 hours and 24 hours, respectively, and the specific compositions of each mixed slurry and the performance evaluation of each suspension stabilizer at 200℃are shown in Table 2. The results show that: various examples may mix cement paste (1.90 g/cm 3 ) The density difference is controlled to be 0.005g/cm after standing for 2 hours 3 Within the range, the free liquid is not more than 0.1 percent, and the density difference of cement stones maintained for 24 hours is not more than 0.011g/cm 3 . Sample B-1 and sample B-2 are high density cement paste systems (densities of 2.00g/cm, respectively) configured based on sample B of example 2 3 And 2.10g/cm 3 ) The sedimentation stability of the cement paste and the water-soluble cement paste is good, and the density difference of the cement paste and the water-soluble cement paste is 0.005g/cm after curing for 24 hours 3 。
The tackifying and cutting action is one of important means for improving the sedimentation stability of solid phase particles in a cement slurry system by using a polymer suspension stabilizer, and is closely related to the content of hydrophilic groups and the length of molecular chains. In the invention, the acrylic acid and the acrylamide have more hydrophilic groups, high reactivity ratio and high molecular weight of a polymerization product when the content is high, and have strong adsorption capacity to free water and cement particles, so that the initial thickening of a cement slurry system is increased and the rheological property is deteriorated; the maleic anhydride contains dicarboxyl, has better dispersibility, can adjust the molecular weight of a polymerization product and avoid excessive increase of viscosity; the introduction of the acryloyloxyethyl trimethyl ammonium chloride optimizes the charge distribution on a molecular chain and reduces the influence on the setting time of cement paste.
The weak gelling agent has small molecular weight, most of molecular structures are in a curled state under the low-temperature working condition, the metal ion content in the slurry is relatively low in the initial stage of cement hydration, and the weak gelling agent can not be chelated with the weak gelling agent to form a macromolecular structure. Thus, the cement paste system with sample F of comparative example 2 had low initial viscosity and good rheology. With the progress of hydration reaction, the temperature of the cement slurry system is increased, the content of metal ions is increased, and active groups such as amino, amido, carboxyl and the like in the weak gelatinizing agent and the tackifying and cutting agent take the metal ions as crosslinking points to gradually form gel substances with a certain space structure and mechanical properties, so that the suspension stabilizing capability is shown.
TABLE 2
As can be seen from Table 2, when the experimental temperature was increased to 200℃and the addition amount of the polymer high temperature resistant suspension stabilizer was 4%, the cement paste system (1.90 g/cm 3 ) The fluidity of the material is not less than 21cm, the initial thickness is less than 24Bc, and the rheological property is good; meanwhile, the fluidity and rheological property of the cement slurry system are reduced along with the increase of the proportion of the tackifying and cutting agent, and the suspension stability is enhanced along with the increase of the molecular weight and the proportion of the weak gelling agent.
Specifically, the high-temperature resistant monomer in the sample B has high proportion, large reactivity ratio and easy increaseThe proportion of active monomers with the molecular chain length is moderate, the proportion of tackifying and cutting agent and weak gelling agent is proper (2:1), the obtained polymer suspension stabilizer has the advantages of insignificant low-temperature tackifying, small high-temperature dilution degree, 23.4cm of cement paste system fluidity, low initial thickening, thickening time up to 301min (as shown in figure 4), fluidity index of 0.88, consistency coefficient of 0.30, and standing for 2h, wherein the cement paste density difference is 0.008g/cm 3 The comprehensive performance is good.
The ratio of tackifying and cleaving agent to weak gellant in sample D was suitable (2.2:1), the latter having a high acrylic acid ratio (19.3% of the total weight of tackifying and cleaving component reactive monomer), product molecular chain length; therefore, the cement slurry system has high initial thickening, small thermal attenuation (shown in figure 5) and good sedimentation stability. Sample E of comparative example 1 only contains tackifying and cutting agents, has large force between Wen Shifen subunits, strong adsorption capacity to cement particles and thick slurry; after the temperature reaches 200 ℃, the viscosity-temperature effect and shearing dilution phenomenon of the polymer are obvious, the suspension capacity is poor, and the density difference of the cement slurry system is increased after standing.
Sample F contained only weak gellant and had limited effect on improving suspension by viscosity; when the concentration of metal ions in cement paste is increased, polymer molecular chains are gradually crosslinked into a surface type and body type structure with certain mechanical properties, so that the consistency of the paste (shown in figure 6) and the migration resistance of solid phase particles are increased, and further increase of density difference is avoided; therefore, the density difference increase from 2h to 24h is smaller than that of sample E.
In conclusion, the high-temperature resistant cement slurry suspension stabilizer provided by the invention has the advantages that the temperature resistance can reach 200 ℃, the low-temperature rheological property is good, the high temperature is not diluted, and the high-temperature resistant cement slurry suspension stabilizer can be used for mixing cement slurry with the high-temperature resistant cement slurry suspension stabilizer with different densities (1.90-2.10 g/cm) 3 ) The free liquid of the cement slurry system is reduced to 0, and the density difference of the slurry which is kept stand for 2 hours is controlled to be 0.02g/cm 3 Within the range, the density difference of the cement stone is not more than 0.04g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The method has important economic value and social significance for ensuring the cementing and well cementation construction safety of the oil and gas well under the working conditions of high temperature and ultra-high temperature, improving the sealing and isolating effect of the deep well and ultra-deep well and the well cementation quality and ensuring the exploration and development effect of deep complex oil and gas reservoirs.

Claims (19)

1. A cement slurry suspension stabilizer comprising a tackifying and cutting agent and a weak gelling agent, the weight ratio of the tackifying and cutting agent to the weak gelling agent being (1.7-2.2): 1, a step of;
the tackifying and cutting agent is prepared from the following raw materials by initiating reaction through an initiator, wherein the raw materials comprise 15-20 parts of active components and the balance of water, and the active components comprise the following components in percentage by mass (13-19.5): (18-26): (0.55-0.8): (15-22.5): (2.8-3.5) 2-acrylamido-2-methylpropanesulfonic acid, acrylamide, maleic anhydride, acrylic acid, and acryloyloxyethyl trimethylammonium chloride;
the weak gelling agent is obtained by initiating reaction of raw materials through an initiator, and the raw materials comprise 15-25 parts of active components and the balance of water based on 100 parts of the total weight of the raw materials; wherein the active components comprise the following components in percentage by mass (16.6-22): (0.2-0.5): (2.8-8.8): (4.3-6.6): (1.4-1.8) sodium styrenesulfonate, itaconic acid, acrylic acid, N' -dimethylacrylamide, N-vinylpyrrolidone; the active component also comprises N-isopropyl acrylamide or N-methylol acrylamide, wherein the mass ratio of the N-isopropyl acrylamide or N-methylol acrylamide to sodium styrene sulfonate is (9.4-13): (16.6-22).
2. The cement slurry suspension stabilizer of claim 1, wherein the initiator used to prepare the weak gelling agent comprises one or a combination of two or more of ammonium persulfate, potassium persulfate, azo-diiso Ding Mi-hydrochloride.
3. The cement slurry suspension stabilizer of claim 1, wherein the weak gellant is prepared by a process comprising: mixing sodium styrenesulfonate, N-isopropyl acrylamide or N-methylol acrylamide, itaconic acid, acrylic acid, N' -dimethyl acrylamide and N-vinyl pyrrolidone with water to obtain a mixed solution, introducing protective gas and adding an initiator to perform a first reaction; and then stopping introducing the protective gas and introducing air, and performing a second reaction to obtain the weak gelling agent.
4. A cement slurry suspension stabiliser according to claim 3, wherein in the method of preparing the weak gelling agent the shielding gas comprises argon and/or nitrogen.
5. A cement slurry suspension stabiliser according to claim 3, wherein in the method of preparing the weak gelling agent the temperature of the first reaction is 45-60 ℃ and the time of the first reaction is 6-7 hours.
6. The cement slurry suspension stabilizer according to claim 5, wherein in the method of producing a weak gelling agent, the temperature of the first reaction is 45 ℃.
7. A cement slurry suspension stabiliser according to claim 3, wherein in the method of preparing the weak gelling agent the temperature of the second reaction is 75-85 ℃ and the time of the second reaction is 50-90 min.
8. The cement slurry suspension stabilizer according to claim 7, wherein in the method of producing a weak gelling agent, the temperature of the second reaction is 80 ℃, and the time of the second reaction is 1h.
9. A cement slurry suspension stabiliser according to claim 3, wherein in the method of preparing the weak gelling agent the pH of the mixed solution is from 6 to 7.
10. The cement slurry suspension stabilizer of claim 1, wherein the mass ratio of the active component to water in the viscosified cutting agent feedstock is 18:82.
11. The cement slurry suspension stabilizer of claim 1, wherein the initiator used to prepare the viscosified cutting agent comprises one or a combination of two or more of ammonium persulfate, potassium persulfate, azo diiso Ding Mi hydrochloride.
12. The cement slurry suspension stabilizer of any one of claims 1-11, wherein the method of preparing the viscosified shear-raising agent comprises:
mixing 2-acrylamide-2-methylpropanesulfonic acid, acrylamide, maleic anhydride, acrylic acid and acryloyloxyethyl trimethyl ammonium chloride with water to obtain a mixed solution, introducing protective gas and adding an initiator to perform a first reaction; and then stopping introducing protective gas and introducing air, and performing a second reaction to obtain the tackifying and cutting agent.
13. A cement slurry suspension stabiliser according to claim 12, wherein in the method of preparing the viscosified cutting agent the shielding gas comprises argon or nitrogen.
14. The cement slurry suspension stabiliser according to claim 12, wherein in the method of preparing the viscosified cutting agent, the temperature of the first reaction is 45-55 ℃ and the time of the first reaction is 6-7 hours.
15. The cement slurry suspension stabiliser of claim 14, wherein in the method of preparing the viscosified shear agent the temperature of the first reaction is 50 ℃.
16. A cement slurry suspension stabiliser according to claim 12, wherein in the method of preparing the viscosified cutting agent the temperature of the second reaction is 75-85 ℃ and the time of the second reaction is 50-90 min.
17. The cement slurry suspension stabiliser of claim 16, wherein the temperature of the second reaction is 80 ℃ and the time of the second reaction is 1h.
18. A cement slurry suspension stabiliser according to claim 12, wherein in the method of preparing the viscosified cutting agent the pH of the mixed solution is from 6 to 7.
19. Use of the cement slurry suspension stabilizer of any one of claims 1-18 in well cementing construction above 200 ℃.
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