CN114716605A - Weak gelling agent, preparation method thereof, cement slurry suspension stabilizer and application thereof - Google Patents

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

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CN114716605A
CN114716605A CN202110009555.2A CN202110009555A CN114716605A CN 114716605 A CN114716605 A CN 114716605A CN 202110009555 A CN202110009555 A CN 202110009555A CN 114716605 A CN114716605 A CN 114716605A
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reaction
agent
cement slurry
gelling agent
temperature
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CN114716605B (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
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    • 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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Abstract

The invention provides a weak gelling agent, a preparation method thereof, a cement slurry suspension stabilizer and application thereof. The weak gelling agent is obtained by initiating reaction of raw materials through an initiator, wherein the raw materials comprise sodium styrene sulfonate, itaconic acid, acrylic acid, N' -dimethylacrylamide, N-isopropylacrylamide or N-hydroxymethyl acrylamide and N-vinyl pyrrolidone. The weak gelling agent can relieve the phenomena of dilution and viscosity reduction in well cementation construction. The invention also provides a cement slurry suspension stabilizer which comprises a tackifying and shearing-improving agent and the weak gelling agent. The invention further provides the 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 cement injection and well cementation construction under the working conditions of high temperature and ultrahigh temperature, and can improve the packing effect and the well cementation quality of deep stratums.

Description

Weak gelling 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 drilling and completion and well cementation in an oil field development process, in particular to a weak gelling agent and a preparation method thereof, a cement slurry suspension stabilizer and application thereof.
Background
With the gradual reduction of the development potential of oil and gas resources in shallow layers and medium and shallow layers, the exploration and development directions of various large oil fields at home and abroad are gradually expanded towards deep complex oil and gas reservoirs, the number of deep wells and ultra-deep wells is continuously increased, and higher requirements are provided for the construction performance and the sealing quality of a well cementation cement slurry system, such as temperature resistance, rheological property, sedimentation stability and the like.
The main purpose of well cementation is to seal oil-gas-water-isolation layer, protect casing and establish smooth oil-gas recovery channel. The cement slurry system as the main body of the well cementing material is essentially composed of a plurality of solid and liquid substances with different densities, appearances and properties, and comprises a settlement unstable system of multiphase coarse dispersion suspension. Under the high-temperature working condition, the brownian motion of solid particles in a cement paste system is accelerated, the power and the coalescence stability are damaged, so that the increase of free liquid and the increase of density difference are caused, the risks of bridge plugging, channeling and the like exist, and the construction safety, the well cementation quality and the later exploration and development effect of deep wells and ultra-deep wells are seriously influenced.
At present, the high-temperature resistant oil well cement suspension stabilizer and anti-settling agent products are mainly divided into the following categories: the cement paste is prepared from inorganic materials such as silica fume, bentonite, sepiolite, superfine materials and the like by a method of optimizing solid phase bulk density or forming flocculent substances through water absorption expansion and increasing system viscosity through particle grading, so that the stability of the cement paste is improved; the natural polymer materials such as xanthan gum, welan gum, guar gum and the like improve the suspension capacity of the cement paste by utilizing the water-thickening property and pseudoplasticity of the natural polymer materials; thirdly, artificially synthesizing a high polymer material, and improving the viscosity of a cement paste system through hydrophilic groups (amide groups, carboxyl groups, carbonyl groups and the like) contained on a molecular chain and higher molecular weight to prevent solid-phase particles from settling. However, the inorganic material has small particle size, large specific surface area and obvious thickening, and when the addition amount is large, the slurry is dusty and difficult to pump; the natural polymer material has fluctuation in product quality in different seasons and batches, is easily decomposed by heat, has reduced viscosity, and loses the suspension stability effect. The artificially synthesized high molecular polymer has stable performance and is easy to regulate, but the problems of serious low-temperature thickening and obvious dilution at ultrahigh temperature (200 ℃) still commonly exist in large addition, and the use temperature of a cement paste system is limited.
In conclusion, under the working conditions of high temperature and ultrahigh temperature, most of the existing oil well cement suspension stabilizers have the defects that solid phase particles are easy to settle when the addition amount is small, low temperature is viscous and high temperature is diluted when the addition amount is large, and the comprehensive performance still has a space for improvement and promotion. Therefore, by combining the research progress of chemistry and materials, functional groups capable of chelating with high-valence metal cations to form weak gelatinous substances are introduced into the molecular structure, and the high-temperature resistant suspension stabilizer with strong temperature resistance and good comprehensive performance is prepared, thereby having 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 relieve the phenomena of dilution and viscosity reduction generated in well cementation construction; the cement slurry suspension stabilizer can ensure the safety of cement injection and well cementation construction under the working conditions of high temperature and ultrahigh temperature, and can improve the packing effect and the well cementation quality of deep strata.
In order to achieve the above object, the present invention provides a weak gelling agent obtained by initiating a reaction of raw materials by an initiator, the raw materials comprising 15 to 25 parts of an active ingredient and the balance of water, based on 100 parts by weight of the total raw materials; wherein the active components comprise the following components in a mass ratio of (16.6-22): (0.2-0.5): (15-17): (4.3-6.6): sodium Styrene Sulfonate (SSS), Itaconic Acid (IA), Acrylic Acid (AA), N' -Dimethylacrylamide (DMAA), and N-vinyl pyrrolidone (NVP) of (1.4-1.8); the active component also comprises N-isopropylacrylamide (NIPAM) or N-methylolacrylamide (N-MAM), and the mass ratio of the N-isopropylacrylamide or the N-methylolacrylamide to the sodium styrene sulfonate is (9.4-13): (16.6-22).
In a specific embodiment of the invention, the weak gelling agent is a polymer generated by a polymerization reaction of an active monomer component containing a carbon-carbon double bond (-C ═ C-) in a weak gelling raw material, in the raw material, a benzene ring in styrene sodium sulfonate can increase the steric hindrance of a polymer molecular structure, 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 number of carbonyl groups (-C ═ O), sulfonic acid groups (-SO), and the like3 -) Amide (-CONH) (-CONH)2) And carboxyl (-COOH) groups and the like with lone pair electrons, and the groups with the lone pair electrons can generate adsorption, ion exchange and chelation with metal ions to form a certain spaceStructural and interactive gel-like substances.
In the above weak gelling agent, the initiator preferably includes one or a combination of two or more of Ammonium Persulfate (APS), potassium persulfate (KPS), azobisisobutyrimidazoline hydrochloride (VA-044).
In the above weak gelling agent, the raw material preferably includes 15 parts of the active component and 85 parts of water, based on 100% by weight of the total weight of the raw material.
In the above weak gelling agent, the mass ratio of the N-isopropylacrylamide or N-methylolacrylamide to the sodium styrenesulfonate may be (9.4 to 10.3): (16.6-22).
Polymer molecules generated by polymerizing the raw materials of the weak gelling agent can be used as a weak gel response component after being introduced into cement slurry, and can gradually form weak gel with a certain space structure and mechanical property along with the continuous increase of the concentration of metal ions in the hydration process of cement, 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 an amide group, inhibit or delay the hydrolysis of the amide group, and improve the high-temperature and ultrahigh-temperature resistance of the polymer. The dicarboxyl in the itaconic acid has higher charge and stronger electronegativity, can improve the hydrophilicity and the coordination of the formed polymer, simultaneously has lower reactivity ratio of the itaconic acid, can be used for adjusting the molecular weight of the polymer, reducing the sensitivity of a weak gel component to metal ions and avoiding the 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 styrene sulfonate, N-isopropyl acrylamide or N-hydroxymethyl 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 carry out a first reaction; and then stopping introducing the protective gas, introducing air, and carrying out 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 gas (which may be high-purity argon gas), nitrogen gas (which may be high-purity nitrogen gas), and the like.
In the above-mentioned method for producing a weak gelling agent, the temperature of the first reaction is generally controlled to be 45 to 60 ℃ (preferably 45 ℃), and the time of the first reaction is generally controlled to be 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 50min to 90min (preferably 1 h).
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 a tackifying and shearing-promoting agent and the weak gelling agent, wherein the mass ratio of the tackifying and shearing-promoting agent to the weak gelling agent is (1.7-2.2): 1.
in a specific embodiment of the invention, the tackifying and cutting agent is generally obtained by initiating a reaction of raw materials through an initiator, wherein the raw materials comprise 15-20 parts (preferably 18 parts) of active components and the balance of water, and the active components comprise (13-19.5) by mass ratio, based on 100 parts of the total weight of the raw materials of the tackifying and cutting agent: (18-26): (0.55-0.8): (15-22.5): 2-acrylamido-2-methylpropanesulfonic Acid (AMPS), Acrylamide (AM), Maleic Anhydride (MAH), Acrylic Acid (AA) and acryloyloxyethyltrimethyl ammonium chloride (DAC) (2.8 to 3.5).
In a specific embodiment of the invention, the tackifying and shearing-promoting agent is a polymer generated by polymerization reaction of an active monomer containing a carbon-carbon double bond in a tackifying and shearing-promoting agent raw material, wherein 2-acrylamido-2-methylpropanesulfonic acid contains a sulfonic acid group, so that the thermal stability and the salt resistance of the molecular weight of the polymer can be increased; the acrylic acid and the acrylamide have high content in the tackifying and shearing agent, contain hydrophilic groups such as carboxyl, acylamino and the like, have high reactivity ratio, are beneficial to improving the length of a polymer molecular chain, and further can improve the viscosity of cement paste and realize the suspension stability of solid-phase particles; the maleic anhydride contains dicarboxyl and has good dispersibility, so that the excessive increase of the viscosity of the tackifying and shear-promoting agent can be avoided; the introduction of the acryloyloxyethyl trimethyl ammonium chloride optimizes the charge distribution on polymer molecular chains, reduces the influence on the cement paste setting time, endows the tackifying and shear-improving agent with certain weak gelation property, assists in improving the cohesion among 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 a specific embodiment of the invention, the cement slurry suspension stabilizer formed by the tackifying and shearing agent and the weak gelling agent is a polymer high temperature (200 ℃) resistant cement slurry suspension stabilizer with unobvious 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, can improve the low-temperature stability of the cement slurry, and can form weak gelation with a certain space structure by taking metal cations (such as aluminum ions, iron ions and the like) released in the hydration process of the cement as nodes for crosslinking.
In a specific embodiment of the present invention, the initiator used for preparing the adhesion promotion and shear promotion agent may comprise one or a combination of two or more of ammonium persulfate, potassium persulfate, azobisisobutyrimidazoline hydrochloride.
In a specific embodiment of the present invention, the preparation method of the adhesion-promoting and shear-promoting agent may include: mixing 2-acrylamide-2-methylpropanesulfonic acid, acrylamide, maleic anhydride, acrylic acid, acryloyloxyethyl trimethyl ammonium chloride and 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, introducing air, and performing a second reaction to obtain the tackifying and shear strength improving 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 preparing the adhesion promoting and cutting agent, the protective gas may be argon (which may be high-purity argon) and/or nitrogen (which may be high-purity nitrogen) or the like.
In the above method for preparing the viscosity increasing and cutting agent, the temperature of the first reaction is generally controlled to be 45-55 ℃ (preferably 50 ℃), and the time of the first reaction is generally controlled to be 4-5 h.
In the above method for preparing the viscosity increasing and shear enhancing agent, the temperature of the second reaction is generally controlled to be 75-85 ℃ (preferably 80 ℃), and the time of the second reaction is generally controlled to be 50min-90min (preferably 1 h).
In the above method for producing a thickening and cutting 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.
In a specific embodiment of the present invention, the above cement slurry suspension stabilizer may be obtained by mixing the above weak gelling agent and tackifying and shear-promoting 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 solute mass content of 15-20%, and adjusting 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 at 45-55 ℃ for 4-5 h; stopping introducing the protective gas, introducing air, reacting at 75-85 deg.C for 50-90 min, and cooling to obtain tackifying and stripping agent;
2. preparation of weak gelling agent: mixing sodium styrene sulfonate, N-isopropyl acrylamide or N-hydroxymethyl acrylamide, itaconic acid, acrylic acid, N' -dimethyl acrylamide and N-vinyl pyrrolidone in water to obtain a mixed solution with the solute mass content of 15%, and adjusting 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 at 45-55 ℃ for 6-7 h; stopping introducing the protective gas, introducing air, reacting at 75-85 deg.C for 50-90 min, and cooling to obtain weak gelling agent;
3. mixing the weak gelatinizer and the viscosity increasing and cutting-extracting agent according to the ratio of (1.7-2.2): 1, and stirring uniformly to obtain a solution, namely the cement slurry suspension stabilizer.
In the preparation method of the cement slurry suspension stabilizer, the processes of preparing the tackifying and shearing agent and the weak gelling agent are respectively and independently carried out, are not mutually interfered and can be synchronously carried out.
The invention further provides the 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 the density difference of free liquid (formed by adding the cement slurry into the suspension stabilizer) is reduced to 0 at 200 ℃ and kept stand for 2 hours is controlled to be 0.020g/cm under the premise of small fluidity loss, good rheological property and low initial thickness3In addition, the sedimentation stability of cement paste under the working conditions of high temperature and ultrahigh temperature is effectively improved, and the method has important practical significance for ensuring the cement injection and well cementation construction safety of deep wells and ultra-deep wells and improving the well cementation quality.
The invention has the following beneficial effects:
1. the weak gelling agent provided by the invention has the characteristics of large molecular chain rigidity, multiple 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 hydration of cement as nodes. The weak gel can improve the interaction among various substances in cement paste, and relieve the phenomena of dilution and viscosity reduction caused by temperature rise and molecular chain flexibility increase in high-temperature and ultrahigh-temperature well cementation construction.
2. The suspension stabilizer provided by the invention can ensure that the density difference of free liquid at 200 ℃ is reduced to 0 and kept stand for 2 hours to be controlled at 0.020g/cm under the premise of small fluidity loss, good rheological property and low initial consistency3In addition, the sedimentation stability of cement paste under the working conditions of high temperature and ultrahigh temperature is effectively improved, and the method has important practical significance for ensuring the safety of cement injection and well cementation construction of deep wells and ultra-deep wells, improving the packing effect and well cementation quality of deep strata and improving the well cementation quality.
Drawings
FIG. 1 is a densification curve of sample A of example 1 at 140 ℃.
FIG. 2 is a thickening curve at 140 ℃ for sample C of example 3.
FIG. 3 is a densification curve of sample E of comparative example 1 at 140 ℃.
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 comparative example 2, sample F.
Detailed Description
The technical solutions of the present invention will be described in detail below in order to clearly understand the technical features, objects, and advantages of the present invention, but the present invention is not limited to the practical scope of the present invention.
Example 1
The embodiment provides a cement slurry suspension stabilizer, the preparation process of which comprises the steps of preparing a tackifying and shearing agent and a weak gelling agent, and the preparation method specifically comprises the following steps:
firstly, preparing a tackifying and cutting agent:
1-1, pouring 4.38 parts by weight of 2-acrylamide-2-methylpropanesulfonic acid, 7.46 parts by weight of acrylamide and 0.19 part by weight 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 by weight of acrylic acid into the mixed solution obtained in the step 1-1, and uniformly stirring;
1-3, adding 0.93 part by weight of acryloyloxyethyl trimethyl ammonium chloride into the mixed solution obtained in the step 1-2, adjusting the pH 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 serving as an initiator into the mixed solution obtained in the step 1-3, wherein the addition amount of the initiator is 0.1 percent of the total mass of the 2-acrylamide-2-methylpropanesulfonic acid, the acrylamide, the maleic anhydride, the acrylic acid and the acryloyloxyethyl trimethyl ammonium chloride, and stirring and reacting for 5 hours at 50 ℃; stopping introducing nitrogen, introducing air, stirring and reacting for 1h at 80 ℃, and cooling to room temperature to obtain the tackifying and shear-promoting agent.
Secondly, preparing a weak gelling agent:
2-1, pouring 6.71 parts of sodium styrene sulfonate, 3.8 parts of N-isopropylacrylamide and 0.14 part of itaconic acid in parts by weight 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 in parts by weight into the mixed solution obtained in the step 2-1, and uniformly stirring;
2-3, adding 0.55 part by weight of N-vinyl pyrrolidone into the mixed solution obtained in the step 2-2, adjusting the pH of the mixed solution to 7 by adopting a sodium hydroxide solution, and supplementing a certain amount of deionized water to obtain a mixed solution with the solute mass content of 15%;
2-4, introducing nitrogen, adding potassium persulfate serving as an initiator, and stirring to react for 6 hours at 45 ℃; stopping introducing nitrogen, introducing air, stirring and reacting for 1h at 80 ℃, and cooling to room temperature to obtain a weak gelling agent;
thirdly, mixing the weak gelling agent and the viscosity-increasing and cutting-extracting agent according to the proportion of 1.8:1, and stirring uniformly to obtain a solution, namely the cement slurry suspension stabilizer, which is marked as a sample A.
Example 2
The embodiment provides a cement slurry suspension stabilizer, the preparation process of which comprises the steps of preparing a tackifying and shearing agent and a weak gelling agent, and the preparation method specifically comprises the following steps:
firstly, 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 by weight, adding a certain amount of deionized water, and uniformly stirring to obtain a mixed solution;
1-2, adding 5.37 parts by weight of acrylic acid into the mixed solution obtained in the step 1-1, and uniformly stirring;
1-3, adding 0.99 part by weight of acryloyloxyethyl trimethyl ammonium chloride into the mixed solution obtained in the step 1-2, adjusting the pH 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 serving as an initiator into the mixed solution obtained in the step 1-3, wherein the addition amount of the initiator is 0.1 percent of the total mass of the 2-acrylamide-2-methylpropanesulfonic acid, the acrylamide, the maleic anhydride, the acrylic acid and the acryloyloxyethyl trimethyl ammonium chloride, and stirring and reacting for 4 hours at 50 ℃; stopping introducing nitrogen, introducing air, stirring and reacting for 1h at 80 ℃, and cooling to room temperature to obtain the tackifying and shear-promoting agent.
Secondly, preparing a weak gelling agent:
2-1, pouring 7.20 parts of sodium styrene sulfonate, 4.08 parts of N-isopropylacrylamide and 0.15 part of itaconic acid in parts by weight 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 in parts by weight into the mixed solution obtained in the step 2-1, and uniformly stirring;
2-3, adding 0.59 part of N-vinyl pyrrolidone into the mixed solution obtained in the step 2-2 in parts by weight, adjusting the pH of the mixed solution to 7 by adopting a sodium hydroxide solution, and supplementing a certain amount of deionized water to obtain a mixed solution with the solute mass content of 15%;
2-4, introducing nitrogen, adding azodiisobutyl imidazoline hydrochloride as an initiator, and stirring and reacting for 6 hours at 45 ℃; stopping introducing nitrogen, introducing air, stirring and reacting for 1h at 80 ℃, and cooling to room temperature to obtain a weak gelling agent;
thirdly, mixing the weak gelling agent and the viscosity-increasing and cutting-extracting agent according to the ratio of 2:1, and stirring uniformly to obtain a solution, namely the cement slurry suspension stabilizer, and recording as a sample B.
Example 3
The embodiment provides a cement slurry suspension stabilizer, the preparation process of which comprises the steps of preparing a tackifying and shear-enhancing agent and a weak gelling agent, and the preparation method specifically comprises the following steps:
firstly, 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 by weight, adding a certain amount of deionized water, and uniformly stirring to obtain a mixed solution;
1-2, adding 5.37 parts by weight of acrylic acid into the mixed solution obtained in the step 1-1, and uniformly stirring;
1-3, adding 0.99 part by weight of acryloyloxyethyl trimethyl ammonium chloride into the mixed solution obtained in the step 1-2, adjusting the pH 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 serving as an initiator into the mixed solution obtained in the step 1-3, wherein the addition amount of the initiator is 0.1 percent of the total mass of the 2-acrylamide-2-methylpropanesulfonic acid, the acrylamide, the maleic anhydride, the acrylic acid and the acryloyloxyethyl trimethyl ammonium chloride, and stirring and reacting for 4 hours at the temperature of 50 ℃; stopping introducing nitrogen, introducing air, stirring and reacting for 1h at 80 ℃, and cooling to room temperature to obtain the tackifying and shear-promoting agent.
Secondly, preparing a weak gelling agent:
2-1, pouring 6.41 parts of sodium styrene sulfonate, 3.63 parts of N-isopropylacrylamide and 0.1 part of itaconic acid in parts by weight 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 in parts by weight into the mixed solution obtained in the step 2-1, and uniformly stirring;
2-3, adding 0.59 part by weight of N-vinyl pyrrolidone into the mixed solution obtained in the step 2-2, adjusting the pH of the mixed solution to 6 by adopting a sodium hydroxide solution, and supplementing a certain amount of deionized water to obtain a mixed solution with the solute mass content of 15%;
2-4, introducing nitrogen, adding azodiisobutyl imidazoline hydrochloride as an initiator, and stirring and reacting for 6 hours at 45 ℃; stopping introducing nitrogen, introducing air, stirring and reacting for 1h at 80 ℃, and cooling to room temperature to obtain a weak gelling agent;
thirdly, mixing the weak gelling agent and the viscosity-increasing and cutting-extracting agent according to the proportion of 1.7:1, and stirring uniformly to obtain a solution, namely the cement slurry suspension stabilizer, which is marked as a sample C.
Example 4
The embodiment provides a cement slurry suspension stabilizer, the preparation process of which comprises the steps of preparing a tackifying and shearing agent and a weak gelling agent, and the preparation method specifically comprises the following steps:
firstly, 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 by weight, adding a certain amount of deionized water, and uniformly stirring to obtain a mixed solution;
1-2, adding 5.37 parts by weight of acrylic acid into the mixed solution obtained in the step 1-1, and uniformly stirring;
1-3, adding 0.99 part by weight of acryloyloxyethyl trimethyl ammonium chloride into the mixed solution obtained in the step 1-2, adjusting the pH 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 azobisisobutyrimidazoline hydrochloride serving as an initiator into the mixed solution obtained in the step 1-3, wherein the addition amount of the initiator is 0.1 percent of the total mass of the 2-acrylamide-2-methylpropanesulfonic acid, the acrylamide, the maleic anhydride, the acrylic acid and the acryloyloxyethyl trimethyl ammonium chloride, and stirring and reacting for 5 hours at 50 ℃; stopping introducing nitrogen, introducing air, stirring and reacting for 1h at 80 ℃, and cooling to room temperature to obtain the tackifying and shear-promoting agent.
Secondly, preparing a weak gelling agent:
2-1, pouring 6.26 parts of sodium styrene sulfonate, 3.55 parts of N-hydroxymethyl acrylamide and 0.16 part of itaconic acid in parts by weight into a reaction vessel, adding deionized water, and uniformly stirring to obtain a mixed solution;
2-2, adding 2.90 parts by weight of acrylic acid and 1.61 parts by weight of N, N' -dimethylacrylamide into the mixed solution obtained in the step 2-1, and uniformly stirring;
2-3, adding 0.52 part by weight of N-vinyl pyrrolidone into the mixed solution obtained in the step 2-2, adjusting the pH of the mixed solution to 7 by adopting a sodium hydroxide solution, and supplementing a certain amount of deionized water to obtain a mixed solution with the solute mass content of 15%;
2-4, introducing nitrogen, adding potassium persulfate serving as an initiator, and stirring to react for 6 hours at 45 ℃; stopping introducing nitrogen, introducing air, stirring and reacting for 1h at 80 ℃, and cooling to room temperature to obtain a weak gelling agent;
thirdly, mixing the weak gelling agent and the viscosity-increasing and cutting-extracting agent according to the ratio of 2.2:1, and stirring uniformly to obtain a solution, namely the cement slurry suspension stabilizer, and recording the solution as a sample D.
Comparative example 1
This comparative example differs from the grout suspension stabilizer of example 2 in that the weak gelling agent of example 2 is not included, i.e., only the viscosifying shear agent of example 2 is used as the grout suspension stabilizer and is designated as sample E.
Comparative example 2
This comparative example differs from the grout suspension stabilizer of example 2 in that the tackifying and shear-promoting agent of example 2 is not included, i.e., only the weak gelling agent of example 2 is used as the grout suspension stabilizer and is designated as sample F.
The grade G cement used in the following tests was a High Sulfate Resistance (HSR) type grade G cement, a manufacturer, extra heavy cement, inc; the adopted quartz sand is 200 meshes and is a product produced by Hongrun quartz silica micropowder company Limited; the adopted antifoaming agent is tributyl phosphate; the adopted micro silicon is a 851 type high-purity product produced by a gold mining processing factory in the Lingshu county in Hebei province; the adopted dispersant is ketoaldehyde oil well cement dispersant, and the manufacturer is Chengdu Chuanfeng chemical engineering Limited liability company with the model of SXY; the weighting material is refined iron ore powder, and the manufacturer is a 20-80 mesh powder factory of the natural mining industry in Hubei Lingshou county; the retarder used was the high temperature resistant copolymer oil well cement retarder described in example 2 of application No. 201410643111.4 (title of the invention: a high temperature resistant copolymer oil well cement retarder and a method for preparing the same).
Test example 1
According to the national standard GB/T19139-2012 oil well cement test method, the free liquid, the density difference, the thickening performance and the rheological performance of the mixed slurry formed by mixing the samples A-F and the oil well cement are evaluated. The test temperature is 140 ℃, the test pressure is 70MPa, and the temperature rise time is 55 min.
The formula of mixed slurry formed by mixing the cement slurry suspension stabilizer A-F and the cement slurry is as follows: oil well cement, quartz sand, micro-silicon, retarder, dispersant and cement paste are suspended stablyThe weight fixing agent, the weighting material and the distilled water. The amount of distilled water is determined according to the density requirement of the cement paste, and the final density of the cement paste is controlled to be 1.90 multiplied by 103-2.10×103kg/m3。
The samples prepared in each example and comparative example were heated to 140 ℃ using a high-temperature high-pressure densifier and cured for 30min, and then placed in a 90 ℃ water bath and a 140 ℃ curing kettle for 2h and 24h, respectively, and the specific composition of each slurry mixture and the performance of each suspension stabilizer at 140 ℃ were evaluated in table 1.
TABLE 1
Figure BDA0002884498530000101
Figure BDA0002884498530000111
As can be seen from Table 1, the density of the cement paste system formed by samples A-D was 1.9g/cm at the experimental temperature of 140 ℃ with the addition of 2.5 parts of suspension stabilizer3The 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 proportion of the tackifying and shearing-promoting agent to the weak gelling agent in the sample A is 1.8:1, and the tackifying and shearing-promoting component has low content of 2-acrylamido-2-methylpropanesulfonic acid (accounting for 24.4 percent of the total weight of the tackifying and shearing-promoting agent), and high content of acrylic acid and acrylamide (accounting for 69.4 percent of the total weight of the tackifying and shearing-promoting agent); the weak gelling agent has low content of N-vinyl pyrrolidone (accounting for 3.7 percent of the total weight of the active monomers of the weak gelling agent), and high content of acrylic acid, N' -dimethyl acrylamide and N-isopropyl acrylamide (accounting for 50.7 percent of the total weight of the active monomers of the weak gelling agent); therefore, the initial consistency of the cement paste system is slightly higher, the consistency of the paste is reduced along with the prolonging of the thickening time (as shown in figure 1), the fluidity of the cement paste system is slightly lower at normal temperature, the fluidity index is large, and the density difference is slightly increased at high temperature.
The ratio of the tackifying and stripping component to the weak gelling agent of sample C was 1.7:1, with the 2-acrylamido-2-methylpropanesulfonic acid in the tackifying and stripping component being higher (accounting for 33.2% of the total weight of the tackifying and stripping agent); in the weak gelling agent, N-vinyl pyrrolidone accounts for 3.9 percent of the total weight of the active monomers, and acrylic acid, N' -dimethyl acrylamide and N-isopropyl acrylamide account for 28.8 percent; after cement slurry is added, the system has high fluidity at normal temperature, good rheological property and 16Bc initial thickening, and the consistency gradually increases along with the extension of thickening time (as shown in figure 2), which is related to the high complexing group content, more formed gel substances and the increase of the binding capacity to cement particles and free water.
Comparative example 1 is a suspension stabilizer containing no weak gelling agent, only the viscosity increasing shear-enhancing agent prepared in example 2. Comparing the test results of the samples of comparative example 1 and example 2, it can be seen that, when the weak gelling agent is removed, the initial consistency of sample E of comparative example 1 is 23Bc, the formed slurry is viscous (as shown in FIG. 3), the fluidity index reaches 0.95, the consistency coefficient is reduced from 0.3 to 0.23 of sample B, and the rheological properties are deteriorated compared with that of sample B.
Comparative example 2 is a suspension stabilizer containing no viscosity increasing shear-enhancing agent, but only the weak gelling agent prepared in example 2. Comparing the test results of the samples of comparative example 2 and example 2, it can be seen that, after the tackifying and shearing agent is removed, sample F of comparative example 2 has low initial consistency of only 13Bc, thinner slurry, small fluidity index, high consistency coefficient, good fluidity, but poor suspension stability.
Sample B-1 and sample B-2 were prepared by increasing the proportions of the polymeric high temperature suspension stabilizer, dispersant and weighting material based on sample B prepared in example 2. The cement paste system densities of the sample B-1 and the sample B-2 are respectively improved to 2.00g/cm3And 2.10g/cm3The fluidity of the slurry is respectively reduced by 5.2 percent and 8.4 percent, the thickening time is shortened by 5min and 14min, the fluidity index is increased by 4.7 percent, the viscosity degree of the slurry is increased to a certain extent, and the effects are related to iron ions in the concentrated iron ore powder of the weighting material.
Sample E of comparative example 1 had good suspension stability at 140 ℃; the density difference of sample F of comparative example 2 was large, and was 0.025g/cm respectively3And 0.041g/cm3The suspension stabilizing effect is not good. This result demonstrates that the addition of the viscosity increasing shear-enhancing agent to the suspension stabilizer has a greater effect on the suspension stabilizing effectIs large.
Test example 2
The samples prepared in each example and comparative example were heated to 200 ℃ using a high-temperature high-pressure densifier and maintained for 30min, and then placed in a 90 ℃ water bath and a 200 ℃ maintenance kettle for 2h and 24h, respectively, and the specific composition of each slurry mixture and the performance of each suspension stabilizer at 200 ℃ were evaluated in table 2. The results show that: in each example, a cement slurry (1.90 g/cm)3) The density difference of the mixture after standing for 2 hours is controlled to be 0.005g/cm3The free liquid is not more than 0.1 percent, and the density difference of the set cement is not more than 0.011g/cm after 24 hours of maintenance3. Sample B-1 and sample B-2 are high density cement slurry systems (densities of 2.00g/cm, respectively) prepared based on sample B of example 23And 2.10g/cm3) The sedimentation stability of the cement and the cement is good, and the density difference of the cement and the cement is 0.005g/cm after 24 hours of curing3。
The tackifying and shear-promoting effect is one of important means for improving the settling stability of solid-phase particles in a cement paste system by using a polymer suspension stabilizer, and the effect is closely related to the content of hydrophilic groups and the length of molecular chains. In the invention, acrylic acid and acrylamide have more hydrophilic groups and high reactivity ratio, and when the content of the acrylic acid and the acrylamide is high, the molecular weight of a polymerization product is large, and the adsorption capacity on free water and cement particles is strong, so that the initial thickening of a cement paste system is increased, and the rheological property is deteriorated; the maleic anhydride contains dicarboxyl, has good dispersibility, can adjust the molecular weight of a polymerization product, and avoids 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 molecular structures are in a curled state under the working condition of low temperature, the content of metal ions in slurry is relatively low at the initial stage of cement hydration, and the weak gelling agent cannot be chelated with the weak gelling agent to form a macromolecular structure. Thus, the cement slurry system with sample F of comparative example 2 added has low initial consistency and good rheology. With the progress of hydration reaction, the temperature of a cement paste system rises, the content of metal ions increases, and active groups such as amino, amido and carboxyl in the weak gelling agent and the tackifying and shear-promoting agent take the metal ions as crosslinking points to gradually form gel substances with certain spatial structure and mechanical property, so that the suspension stability is shown.
TABLE 2
Figure BDA0002884498530000131
As can be seen from Table 2, samples A-D formed a cement paste system (1.90 g/cm) when the experimental temperature was increased to 200 ℃ and the polymer high temperature suspension stabilizer addition was 4%3) The fluidity of the rubber is not less than 21cm, the initial thickness of the rubber is less than 24Bc, and the rheological property is good; meanwhile, the fluidity and the rheological property of the cement paste system are reduced along with the increase of the proportion of the tackifying and shear strength improving 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 sample B has high proportion of high-temperature resistant monomers, high reactivity ratio and moderate proportion of active monomers which are easy to increase molecular chain length, the proportion of a tackifying and shearing agent and a weak gelling agent is proper (2:1), the obtained polymer suspension stabilizer has unobvious low-temperature tackifying effect, small high-temperature dilution degree, 23.4cm fluidity of a cement paste system, low initial thickening, thickening time of 301min (as shown in figure 4), 0.88 fluidity index, 0.30 consistency coefficient and 0.008g/cm density difference of cement paste after standing for 2 hours3And the comprehensive performance is good.
The ratio of the tackifying and shear-enhancing agent to the weak gelling agent in sample D is appropriate (2.2:1), the acrylic acid ratio of the weak gelling agent is high (19.3% of the total weight of the reactive monomers of the tackifying and shear-enhancing component), and the molecular chain length of the product is long; therefore, the cement slurry system has high initial thickening, small thermal attenuation (as shown in figure 5) and good sedimentation stability. The sample E of the comparative example 1 only contains a tackifying and shearing agent, and has large intermolecular force at low temperature, strong adsorption capacity on cement particles, and thick slurry; after the temperature reaches 200 ℃, the viscosity-temperature effect and the shearing dilution phenomenon of the polymer are obvious, the suspension capability is deteriorated, and the density difference of a cement paste system is increased after standing.
Sample F contained only a weak gelling agent, and had limited effect in improving suspension by viscosity; when the concentration of metal ions in the cement paste is increased, polymer molecular chains are gradually crosslinked into a surface type structure and a 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 the density difference is prevented from being further increased; therefore, the density difference between 2h and 24h is less amplified than that of sample E.
In conclusion, the polymer high temperature resistant cement slurry suspension stabilizer provided by the invention has the advantages of temperature resistance of 200 ℃, good low temperature rheological property, no dilution at high temperature, and capability of stabilizing the suspension stabilizer with different densities (1.90-2.10 g/cm)3) The free liquid of the cement paste system is reduced to 0, and the density difference of the paste after standing for 2 hours is controlled to be 0.02g/cm3Within the cement paste, the density difference of the cement paste is not more than 0.04g/cm3(ii) a The method has important economic value and social significance for ensuring the safety of cementing and well cementing construction of the oil and gas well under the working conditions of high temperature and ultrahigh temperature, improving the packing effect and well cementing quality of the deep well and the ultra-deep well and ensuring the exploration and development effect of deep complex oil and gas reservoirs.

Claims (16)

1. A weak gelling agent obtained by initiating a reaction of raw materials by an initiator, the raw materials comprising 15 to 25 parts of an active component and the balance of water, based on 100 parts by weight of the raw materials;
wherein the active components comprise the following components in a mass ratio of (16.6-22): (0.2-0.5): (2.8-8.8): (4.3-6.6): sodium styrene sulfonate of (1.4-1.8), itaconic acid, acrylic acid, N' -dimethylacrylamide, N-vinylpyrrolidone;
the active component also comprises N-isopropylacrylamide or N-methylolacrylamide, and the mass ratio of the N-isopropylacrylamide or N-methylolacrylamide to the sodium styrene sulfonate is (9.4-13): (16.6-22).
2. The weak gelling agent of claim 1, wherein the initiator comprises one or a combination of two or more of ammonium persulfate, potassium persulfate and azobisisobutylimidazoline hydrochloride.
3. A method for producing a weak gelling agent as claimed in claim 1 or 2, comprising: mixing sodium styrene sulfonate, N-isopropyl acrylamide or N-hydroxymethyl acrylamide, itaconic acid, acrylic acid, N' -dimethylacrylamide and N-vinyl pyrrolidone with water to obtain a mixed solution, introducing protective gas and adding an initiator to carry out a first reaction; and then stopping introducing the protective gas, introducing air, and carrying out a second reaction to obtain the weak gelling agent.
4. The production method according to claim 3, wherein the protective gas includes argon and/or nitrogen.
5. The preparation method according to claim 3, wherein the temperature of the first reaction is 45-60 ℃, and the time of the first reaction is 6-7 h; preferably, the temperature of the first reaction is 45 ℃.
6. The production method according to claim 3, wherein the temperature of the second reaction is 75 to 85 ℃, and the time of the second reaction is 50 to 90 min; preferably, the temperature of the second reaction is 80 ℃ and the time of the second reaction is 1 h.
7. The production method according to claim 3, wherein the pH of the mixed solution is 6 to 7.
8. A cement slurry suspension stabilizer comprising a tackifying and shearing enhancing agent and the weak gelling agent of any one of claims 1 to 7, wherein the mass ratio of the tackifying and shearing enhancing agent to the weak gelling agent is (1.7-2.2): 1.
9. the cement slurry suspension stabilizer of claim 8, wherein the tackifying and shearing-promoting agent is obtained by initiating a reaction of raw materials through an initiator, the raw materials comprise 15-20 parts of active components and the balance of water, and the active components comprise (13-19.5) by mass: (18-26): (0.55-0.8): (15-22.5): (2.8-3.5) of 2-acrylamido-2-methylpropanesulfonic acid, acrylamide, maleic anhydride, acrylic acid, and acryloyloxyethyltrimethyl ammonium chloride; preferably, the mass ratio of the active component to the water is 18: 82.
10. The cement slurry suspension stabilizer of claim 9, wherein the initiator used to prepare the viscosifying shear comprises one or a combination of two or more of ammonium persulfate, potassium persulfate, azobisisobutyrimidazoline hydrochloride.
11. A cement slurry suspension stabiliser as claimed in any one of claims 8 to 10, wherein the viscosifying shear promoter is prepared by a process comprising:
mixing 2-acrylamide-2-methylpropanesulfonic acid, acrylamide, maleic anhydride, acrylic acid, acryloyloxyethyl trimethyl ammonium chloride and 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, introducing air, and carrying out a second reaction to obtain the tackifying and stripping agent.
12. The cement slurry suspension stabilizer of claim 11, wherein, in the preparation method of the tackifying and shearing agent, the protective gas comprises argon or nitrogen.
13. The cement slurry suspension stabilizer according to claim 11, wherein in the preparation method of the tackifying and shearing agent, the temperature of the first reaction is 45-55 ℃, and the time of the first reaction is 6-7 h; preferably, the temperature of the first reaction is 50 ℃.
14. The cement slurry suspension stabilizer according to claim 11, wherein in the preparation method of the tackifying and shearing agent, the temperature of the second reaction is 75-85 ℃, and the time of the second reaction is 50-90 min; preferably, the temperature of the second reaction is 80 ℃, and the time of the second reaction is 1 h.
15. The cement slurry suspension stabilizer according to claim 11, wherein in the preparation method of the tackifying and shearing enhancing agent, the pH of the mixed solution is 6-7.
16. Use of a cement slurry suspension stabiliser as claimed in any one of claims 8 to 15 in well cementing operations at temperatures above 200 ℃.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090260819A1 (en) * 2008-04-21 2009-10-22 Kurian Pious V Compositions and methods for diverting injected fluids to achieve improved hydrocarbon fluid recovery
CN104403056A (en) * 2014-11-07 2015-03-11 中国石油天然气集团公司 High-temperature-resistant copolymer oil well cement retarder and preparation method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090260819A1 (en) * 2008-04-21 2009-10-22 Kurian Pious V Compositions and methods for diverting injected fluids to achieve improved hydrocarbon fluid recovery
CN104403056A (en) * 2014-11-07 2015-03-11 中国石油天然气集团公司 High-temperature-resistant copolymer oil well cement retarder and preparation method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
王中华;: "2009～2010年国内钻井液处理剂研究与应用进展", 中外能源, no. 03, pages 42 - 51 *

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