CN105646793A - Low hydration heat early strength cement fluid loss reducer for oil-gas well cementing and preparation method - Google Patents
Low hydration heat early strength cement fluid loss reducer for oil-gas well cementing and preparation method Download PDFInfo
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Abstract
Belonging to the technical field of cement additives for oil-gas well cementing, the invention discloses a low hydration heat early strength cement fluid loss reducer for oil-gas well cementing and a preparation method. The fluid loss reducer is a copolymer taking acrylamide, 2-acrylamido-2-methyl propane sulfonic acid, acrylic acid, (methyl) acryloxyethyl-trimethylammonium chloride and allyl polyethenoxy ether as monomers. The allyl polyethenoxy ether has a molecular structure as CH2=CHCH2O(CH2CH2O)nH. The fluid loss reducer provided by the invention can make the fluid loss amount of low hydration heat early strength cement reach less than 50ml/30min at 20DEG C, ensures the safety of cementing operation, and improves the cementing quality.
Description
Technical field
The present invention relates to a kind of oil gas well cementing operation low hydration heat short-term strength cement water retaining and preparation method, belong to well cementation of oil-gas well mud admixture technical field.
Background technology
Natural gas hydrate exist to deep water cementing and forever freeze stratum cement the well propose new challenge, it is desired to cementing slurry must have low hydration heat and low temperature intensity develops fast feature, and for this reason, industry member develops low hydration heat short-term strength cement. When cementing operation, low hydration heat short-term strength cement slurry will occur " diafiltration " through high-permeability reservoir under stress, cause cement slurry water loss, cause the degree of mobilization of grout to be deteriorated, jeopardize construction safety; In addition, reservoir also can be formed injury in various degree by grout filtrate. Therefore, usually need when well cementing operation to use water retaining.
Low hydration heat short-term strength cement described in the application is (according to API (API) standard: 7d hydration heat is 244.33J/g, it is 399.26J/g with APIG class g cement 7d hydration heat under condition) it is the extraordinary gelling material of a kind of non-silicate base, it consists of: short-term strength cement 40%, pozzolanic materials 60%. Wherein, the mineral content of short-term strength cement is: SiO27%, Al2O341%, Fe2O33%, CaO36%, SO313%; Pozzolanic materials mineral content is: SiO242%, Al2O323%, Fe2O315%, MgO0.9%, CaO2.8%, other K, Na, S oxide compound and impurity are about 16.3%. The common water retaining being applicable to silicate cement at a lower temperature (20 DEG C) dehydration of above-mentioned grout can not be controlled well. If the fluid loss containing common oil well water retaining Natvosol, carboxymethyl hydroxyethyl cellulose, acrylamide/2-acrylamido-2-methyl propane sulfonic acid/acrylic terpolymer, acrylamide/2-acrylamido-2-methyl propane sulfonic acid/vinylformic acid/maleic anhydride tetrapolymer grout is all more than 1000ml/30min. And in well cementing operation, the fluid loss of general requirement grout is no more than 250ml/30min, (such as drilling liner cementing) under Special Circumstances, it is desired to the fluid loss of grout is no more than 50ml/30min.
In the process realizing the present invention, the present inventor finds at least to exist in prior art following problem: cement water reducer of the prior art can not make the fluid loss of low hydration heat short-term strength cement at 20 DEG C reach below 50ml/30min.
Summary of the invention
Technical problem to be solved by this invention is, it is provided that a kind of water retaining that the fluid loss of low hydration heat short-term strength cement at 20 DEG C can be made to reach below 50ml/30min.
Specifically, following technical scheme is comprised:
The present invention provides a kind of oil gas well cementing operation low hydration heat short-term strength cement water retaining, and described water retaining is: described water retaining is: taking acrylamide, 2-acrylamido-2-methyl propane sulfonic acid, vinylformic acid, (methyl) acrylyl oxy-ethyl-trimethyl salmiac and allyl polyethenoxy ether as the multipolymer of monomer;
The molecular structure of described allyl polyethenoxy ether is as follows:
CH2=CHCH2O(CH2CH2O)nH��
Preferably, the value of the n in described allyl polyethenoxy ether molecular structure is 6,12,18.
Preferably, the value of the n in described allyl polyethenoxy ether molecular structure is 18.
Further, in described water retaining, the part by weight of acrylamide is 30-40 part, the part by weight of 2-acrylamido-2-methyl propane sulfonic acid is 30-50 part, acrylic acid part by weight is 2-8 part, the part by weight of (methyl) acrylyl oxy-ethyl-trimethyl salmiac is 5-15 part, and the part by weight of allyl polyethenoxy ether is 3-10 part.
Further, in described water retaining, the part by weight of acrylamide is 35-40 part, the part by weight of 2-acrylamido-2-methyl propane sulfonic acid is 35-45 part, acrylic acid part by weight is 5-8 part, the part by weight of (methyl) acrylyl oxy-ethyl-trimethyl salmiac is 10-15 part, and the part by weight of allyl polyethenoxy ether is 6-10 part.
Further, the number-average molecular weight of described water retaining is 80000-120000.
Further, the number-average molecular weight of described water retaining is 90000-110000.
Above-mentioned water retaining is prepared by following method:
Step (1), by the acrylamide that part by weight is 30-40 part, part by weight is the 2-acrylamido-2-methyl propane sulfonic acid of 30-50 part, part by weight is the vinylformic acid of 2-8 part, the allyl polyethenoxy ether of part by weight to be (methyl) acrylyl oxy-ethyl-trimethyl salmiac of 5-15 part and part by weight be 3-10 part is dissolved in deionized water, monomer adds sodium hydrate solid after dissolving completely, and solution ph is adjusted to 6.5-7.5; The molecular structure of described allyl polyethenoxy ether is: CH2=CHCH2O(CH2CH2O)nH, wherein the value of n is 6,12,18;
Step (2), joins in reaction vessel by step (1) gained solution, after being warming up to 75 DEG C under nitrogen protection, adds ammonium persulfate solution initiated polymerization;
Step (3), after temperature of reaction system rises to 85 DEG C of reaction 2.5-3.5h, obtains the solution of described water retaining, obtains the pulvis of described water retaining after overcooling, drying, pulverizing.
Preferably, the value of the n in described allyl polyethenoxy ether molecular structure is 18.
Specifically, the part by weight of described acrylamide is 35-40 part, the part by weight of described 2-acrylamido-2-methyl propane sulfonic acid is 35-45 part, described acrylic acid part by weight is 5-8 part, the part by weight of described (methyl) acrylyl oxy-ethyl-trimethyl salmiac is 10-15 part, and the part by weight of described allyl polyethenoxy ether is 6-10 part.
Specifically, the part by weight of ammonium persulphate described in described preparation method is 0.5-1.5 part.
Specifically, in described water retaining preparation process, stirring velocity is 140-160 rev/min.
The useful effect of the technical scheme of the present invention is: the composition of tradition 2-acrylamido-2-methyl propane sulfonic acid copolymer oil gas well cementing cement water reducer is improved by the present invention, (methyl) acrylyl oxy-ethyl-trimethyl salmiac and allyl polyethenoxy ether is with the addition of in multipolymer forms, wherein (methyl) acrylyl oxy-ethyl-trimethyl salmiac is cationic monomer, therefore final gained multipolymer is cationic polymers, positively charged ion can better be adsorbed on low hydration heat short-term strength cement particle, and then reduce cement fluid loss in the curing process. when the value of the n in allyl polyethenoxy ether molecular structure is 6 and 12, gained water retaining can make the fluid loss of low hydration heat short-term strength cement at 20 DEG C reach below 250ml/30min, when the value of the n in allyl polyethenoxy ether molecular structure is 18, gained water retaining can make the fluid loss of low hydration heat short-term strength cement at 20 DEG C reach below 50ml/30min.
Embodiment
For making the technical scheme of the present invention and advantage clearly, below embodiment of the present invention is described further in detail.
The present invention provides a kind of oil gas well cementing operation low hydration heat short-term strength cement water retaining, this water retaining is the multipolymer taking acrylamide, 2-acrylamido-2-methyl propane sulfonic acid, vinylformic acid, (methyl) acrylyl oxy-ethyl-trimethyl salmiac and allyl polyethenoxy ether as monomer, and the molecular structure of described allyl polyethenoxy ether is: CH2=CHCH2O(CH2CH2O)nH��
Low hydration heat short-term strength cement is a kind of special cement, its composition has compared difference with environment for use with Portland cement, therefore common cement water reducer, such as Natvosol, carboxymethyl hydroxyethyl cellulose, acrylamide/2-acrylamido-2-methyl propane sulfonic acid/acrylic terpolymer, acrylamide/2-acrylamido-2-methyl propane sulfonic acid/vinylformic acid/maleic anhydride tetrapolymer etc., can not meet low hydration heat short-term strength cement in use to the requirement of fluid loss. At present, the mechanism of action for water retaining does not also have clear and definite explanation, and general mechanism is thought: water retaining molecular adsorption, on cement granules, improves the grain composition of grout, easily forms fine and close filter cake under differential pressure, reduces fluid loss; Meanwhile, water retaining needs certain molecular weight, increases the viscosity of grout, thus increases seepage resistance, reduces the filter loss of grout to stratum, thus to falling the effect of dehydration. Therefore, it is to increase the adsorptive power of water retaining molecule on cement granules and there is certain molecular weight can improve and fall dehydration effect. Composition according to low hydration heat short-term strength cement, the composition of tradition acrylamide/2-acrylamido-2-methyl propane sulfonic acid/acrylic copolymer water retaining is improved by contriver, with the addition of (methyl) acrylyl oxy-ethyl-trimethyl salmiac and allyl polyethenoxy ether in multipolymer forms. (methyl) acrylyl oxy-ethyl-trimethyl salmiac is cationic monomer, therefore gained multipolymer is cationic polymers, some component in cation group and low hydration heat short-term strength cement interacts, thus makes water retaining molecule produce stronger adsorption on cement granules.Allyl polyethenoxy ether can also improve the adsorptive power of water retaining molecule, with other component actings in conjunction in water retaining molecule, effectively reduces low hydration heat short-term strength cement fluid loss in the curing process. Further, it is desirable that water retaining has certain molecular weight, molecular weight is too low, then grout control dehydration ability is poor, and molecular weight is too high, then cause the rheological of grout poor, is unfavorable for construction.
In above-mentioned water retaining, when the value of the n in allyl polyethenoxy ether molecular structure is 6 and 12, gained water retaining can make the fluid loss of low hydration heat short-term strength cement at 20 DEG C reach below 250ml/30min, meets well cementation requirement generally. When the value of the n in allyl polyethenoxy ether molecular structure is 18, due to stronger when its adsorptive power is 6 and 12 than n, therefore the performance of gained water retaining is better, the fluid loss of low hydration heat short-term strength cement at 20 DEG C can be made to reach below 50ml/30min, meet the well cementation requirement under the Special Circumstances such as drilling liner cementing.
In above-mentioned water retaining, the part by weight of acrylamide is 30-40 part, the part by weight of 2-acrylamido-2-methyl propane sulfonic acid is 30-50 part, acrylic acid part by weight is 2-8 part, the part by weight of (methyl) acrylyl oxy-ethyl-trimethyl salmiac is 5-15 part, and the part by weight of allyl polyethenoxy ether is 3-10 part. Wherein, each component ratio is more preferably: the part by weight of acrylamide is 35-40 part, the part by weight of 2-acrylamido-2-methyl propane sulfonic acid is 35-45 part, acrylic acid part by weight is 5-8 part, the part by weight of (methyl) acrylyl oxy-ethyl-trimethyl salmiac is 10-15 part, and the part by weight of allyl polyethenoxy ether is 6-10 part.
In above-mentioned water retaining, the number-average molecular weight of water retaining should control at 80000-120000, it is more preferable to 90000-110000, and it is better that dehydration effect falls in the water retaining in this molecular weight ranges.
The monomer being used for synthesizing the water retaining of the present invention is the very high vinyl monomer of reactive behavior, therefore can prepare the water retaining of the present invention by the method for radical polymerization, owing to above-mentioned monomer is water-soluble monomer, therefore polymerization process can adopt aqueous solution polymerization, with water soluble starter (such as ammonium persulphate) initiated polymerization, concrete grammar is as follows: be the acrylamide of 30-40 part by part by weight, part by weight is the 2-acrylamido-2-methyl propane sulfonic acid of 30-50 part, part by weight is the vinylformic acid of 2-8 part, the allyl polyethenoxy ether of part by weight to be (methyl) acrylyl oxy-ethyl-trimethyl salmiac of 5-15 part and part by weight be 3-10 part is dissolved in deionized water, monomer adds sodium hydrate solid after dissolving completely, solution ph is adjusted to 6.5-7.5, then above-mentioned solution is joined in reaction vessel, after being warming up to 75 DEG C under nitrogen protection, add ammonium persulfate solution initiated polymerization, after temperature of reaction system is risen to 85 DEG C of reaction 2.5-3.5h, obtain the solution of described water retaining, after overcooling, drying, pulverizing, obtain the pulvis of described water retaining.
Wherein, above-mentioned each monomer weight ratio is preferred: acrylamide 35-40 part, 2-acrylamido-2-methyl propane sulfonic acid 35-45 part, vinylformic acid 5-8 part, (methyl) acrylyl oxy-ethyl-trimethyl salmiac 10-15 part, allyl polyethenoxy ether 6-10 part.
The ratio regular meeting of monomer and initiator affects the molecular weight of final polymkeric substance, and therefore in above-mentioned preparation method, the part by weight of ammonium persulphate is 0.5-1.5 part.
In above-mentioned water retaining preparation process, constantly stirring, stirring velocity controls at 140-160 rev/min.
The embodiment of the present invention with chemical reagent used in comparative example is:
Acrylamide, purity: 99.5%, Zhengzhou gold 10,000,000,000 Chemicals company limiteds;
2-acrylamido-2-methyl propane sulfonic acid, purity: 98%, Shanghai Mai Ruier chemical technology company limited;
Vinylformic acid, technical grade, Dongfang Chemical Plant, Beijing, The East Chemical Plant,Beijing;
Acrylyl oxy-ethyl-trimethyl salmiac, purity: 78%, Zibo Wan Duofu Chemical Co., Ltd.;
Methylacryoyloxyethyl trimethyl ammonium chloride, purity: 78%, Zibo Wan Duofu Chemical Co., Ltd.;
Allyl polyethenoxy ether (CH2=CHCH2O(CH2CH2O)nH, n=6), purity: 99%, Hai'an, Jiangsu petroleum chemical plant;
Allyl polyethenoxy ether (CH2=CHCH2O(CH2CH2O)nH, n=12), purity: 99%, Hai'an, Jiangsu petroleum chemical plant;
Allyl polyethenoxy ether (CH2=CHCH2O(CH2CH2O)nH, n=18), purity: 99%, Hai'an, Jiangsu petroleum chemical plant;
N, N '-dimethyl acrylamide, purity: 99%, Beijing Rui Bolong petroleum science and technology Development Co., Ltd;
Methylene-bisacrylamide, purity: 99%, cloud superpolymerization Materials Co., Ltd of city of Germany and Britain;
Methylene-succinic acid, purity: 99%, photoproduction limited-liability company of Zhejiang state;
Maleic anhydride, purity: 99.5%, Zhong He chemical plant, Tianjin;
Dimethyl diallyl ammonium chloride, purity: 65%, source, Shandong Feng reaches Chemical Co., Ltd.;
Ammonium persulphate, purity: 99.8%, Linyi City sky science, industry and trade company limited;
Sodium hydroxide, purity: 99%, Tianjin Jin Dong days positive fine chemistry reagent factory;
Low hydration heat short-term strength cement forms: short-term strength cement 40%, pozzolanic materials 60%. Wherein, the mineral content of short-term strength cement is: SiO27%, Al2O341%, Fe2O33%, CaO36%, SO313%; Pozzolanic materials mineral content is: pozzolanic materials mineral content is: SiO242%, Al2O323%, Fe2O315%, MgO0.9%, CaO2.8, other K, Na, S oxide compound and impurity are about 16.3%. For Tianjin Zhong Youboxing engineering science and technology company limited produces.
Gained water retaining prepares all in accordance with the following methods in the embodiment of the present invention and in comparative example:
Step (1), according to the monomer ratio shown in table 1, table 3, table 5, table 7 and table 9, is dissolved in deionized water by monomer used, and monomer adds sodium hydrate solid after dissolving completely, and solution ph is adjusted to 7.0;
Step (2), joins in four-hole bottle by step (1) gained solution, and after being warming up to 75 DEG C under nitrogen protection, the weight concentration adding respective quality according to monomer ratio shown in table is the ammonium persulfate solution initiated polymerization of 10%;
Step (3), after temperature of reaction system rises to 85 DEG C of reaction 3h, obtains the solution of water retaining, obtains the pulvis of water retaining after overcooling, drying, pulverizing.
Above-mentioned water retaining is added in grout, the fluid loss of grout, the free water yield and ultimate compression strength are tested.
Grout is prepared, cement-slurry method according to GB/T19139-2012 (oil-well cement test method):
Water retaining+3 parts of citric acids+42 parts of water that 100 parts of low hydration heat short-term strength cements+1 part of embodiment or comparative example obtain.
The fluid loss of grout, the free water yield and ultimate compression strength are tested according to GB/T19139-2012 (oil-well cement test method).
Embodiment 1
The present embodiment prepares water retaining according to the technology of the present invention method, and each monomer ratio is in table 1. Gained water retaining is added in grout, water retaining performance is tested, the results are shown in Table 2.
Water retaining formula (unit: g) in table 1 embodiment 1
Table 2 embodiment 1 gained water retaining performance
As can be seen from Table 2, when using the allyl polyethenoxy ether of n=18, it is good that dehydration effect falls in prepared water retaining, and sample 1#-8# can make the fluid loss of low hydration heat short-term strength cement at 20 DEG C reach below 50ml/30min, and does not substantially produce free liquid; Wherein, the fluid loss of sample 6#, 7# and 8# reaches below 20ml/30min. The cement low temperature intensity development of the water retaining adding the present invention is fast, and at 8 DEG C, 24h ultimate compression strength all reaches more than 14MPa.
Embodiment 2
The allyl polyethenoxy ether of n=18 in the allyl polyethenoxy ether alternate embodiment 1 of the present embodiment n=6 and 12, each monomer ratio is in table 3. Gained water retaining is added in grout, water retaining performance is tested, the results are shown in Table 4.
Water retaining formula (unit: g) in table 3 embodiment 2
Table 4 embodiment 2 gained water retaining performance
As can be seen from Table 4, after the allyl polyethenoxy ether of n=18 is replaced the allyl polyethenoxy ether for n=6 and 12, the filtrate-loss control of gained water retaining can decline to some extent, the fluid loss of sample 9#-16# has exceeded 50ml/30min, but still at below 250ml/30min, well cementation requirement generally can be met, but the Special Circumstances such as drilling liner cementing can not be used for. In this comparative example, the reason of water retaining degradation is that the allyl polyethenoxy ether molecular chain of n=6 and 12 is shorter, and adsorptive power is poor, thus causes gained water retaining degradation.
Comparative example 1
This comparative example is on the basis of embodiment 2, substitute cationic monomer (methyl) acrylyl oxy-ethyl-trimethyl salmiac in technical solution of the present invention with the monomer methylene-bisacrylamide of non-ionic type, prove the effect of cationic monomer in control fluid loss.
Each monomer ratio is in table 5, and gained water retaining the performance test results is in table 6.
Water retaining formula (unit: g) in table 5 comparative example 1
Table 6 comparative example 1 gained water retaining performance
As can be seen from Table 6, after cationic monomer (methyl) acrylyl oxy-ethyl-trimethyl salmiac is replaced the monomer methylene-bisacrylamide for non-ionic type, the filtrate-loss control of gained sample 17#-24# can obviously reduce, fluid loss at 20 DEG C has all exceeded 1000ml/30min, can not meet low hydration heat short-term strength cement in use to the requirement of fluid loss (owing to fluid loss is greater than the control dehydration ability of 1000ml/30min, therefore, it does not have carry out the free water yield and intensity test). This comparative example demonstrates the effect of cationic polymers in control cement fluid loss.
Comparative example 2
This comparative example is on the basis of comparative example 1, substitute cationic monomer (methyl) acrylyl oxy-ethyl-trimethyl salmiac in technical solution of the present invention with the monomer methylene-bisacrylamide of non-ionic type, substitute allyl polyethenoxy ether with methylene-succinic acid, maleic anhydride.
Each monomer ratio is in table 5, and gained water retaining the performance test results is in table 8.
Water retaining formula (unit: g) in table 7 comparative example 2
Table 8 comparative example 2 gained water retaining performance
As can be seen from Table 8, owing to there is no cationic monomer (methyl) acrylyl oxy-ethyl-trimethyl salmiac, the filtrate-loss control of gained sample 25#-32# can obviously reduce, fluid loss at 20 DEG C has all exceeded 1000ml/30min, can not meet low hydration heat short-term strength cement in use to the requirement of fluid loss (owing to fluid loss is greater than the control dehydration ability of 1000ml/30min, therefore, it does not have carry out the free water yield and intensity test).This comparative example demonstrates the effect of cationic polymers in control cement fluid loss equally.
Comparative example 3
This comparative example cationic monomer diallyldimethylammonChloride Chloride substitutes cationic monomer (methyl) acrylyl oxy-ethyl-trimethyl salmiac in technical solution of the present invention, contrasts the effect of different cationic monomer in control cement fluid loss.
Each monomer ratio is in table 9, and gained water retaining the performance test results is in table 10.
Water retaining formula (unit: g) in table 9 comparative example 3
Table 10 comparative example 3 gained water retaining performance
As can be seen from Table 10, compared with the water retaining of not cation component, the filtrate-loss control of the sample 33#-35# of this comparative example can improve, at 20 DEG C, the fluid loss of low hydration heat short-term strength cement is about 800ml/30min, and this just illustrates that adding of cationic components can improve the ability that water retaining controls fluid loss. But, compared with embodiment 1, the ability that 33#-35# controls fluid loss is obviously deteriorated, it does not have reach low hydration heat short-term strength cement in service requirements (250ml/30min) generally. The reason of this phenomenon is caused to be: containing two double bonds in dimethyl diallyl ammonium chloride molecule, monomer itself can become ring in the course of the polymerization process, reduce the adsorptive power of water retaining, so that the fluid loss of the low hydration heat short-term strength cement of interpolation 33#-35# at 20 DEG C is more than 50ml/30min.
Comparative example 4
Embodiment 1 gained sample 6# and prior art water retaining are contrasted by this comparative example.
The sample carrying out contrasting is respectively: commercially available oil-well cement filtrate reducer: Natvosol, carboxymethyl hydroxyethyl cellulose, polyvinyl alcohol, acrylamide/2-acrylamido-2-methyl propane sulfonic acid/acrylic copolymer, acrylamide/2-acrylamido-2-methyl propane sulfonic acid/vinylformic acid/copolymer-maleic anhydride;
According to application number 200810226689.4 embodiment 1-4 synthesize sample (being designated as 36#, 37# respectively, 38# with 39#) 2-in-1 with embodiment with application number 201310070182.5 embodiment 1 become sample (being designated as 40# and 41# respectively).
The results are shown in Table 11.
The water retaining performance comparison of table 11 water retaining provided by the invention and prior art
Conclusion as can be drawn from Table 11, the dehydration controllability of grout is obviously better than the water retaining of other type listed by table 11 by low hydration heat short-term strength cement water retaining provided by the invention.
To sum up, the composition of tradition acrylamide/2-acrylamido-2-methyl propane sulfonic acid/acrylic copolymer water retaining is improved by the present invention, with the addition of cationic components (methyl) acrylyl oxy-ethyl-trimethyl salmiac and allyl polyethenoxy ether in multipolymer forms. Owing to some component in cation group and low hydration heat short-term strength cement interacts, thus water retaining molecule is made to produce stronger adsorption on cement granules so that the ability of water retaining control fluid loss significantly improves. In addition, allyl polyethenoxy ether can also improve the adsorptive power of water retaining molecule, with other component actings in conjunction in water retaining molecule, effectively reduces low hydration heat short-term strength cement fluid loss in the curing process. Particularly when the value of the n in allyl polyethenoxy ether molecular structure is 18, it is possible to make the fluid loss of low hydration heat short-term strength cement at 20 DEG C reach below 50ml/30min, meet the well cementation requirement under the Special Circumstances such as drilling liner cementing, it is to increase cementing quality.
The above is only the technical scheme understanding the present invention for the ease of the technician of this area, not in order to limit the present invention. Within the spirit and principles in the present invention all, any amendment of doing, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. an oil gas well cementing operation low hydration heat short-term strength cement water retaining, it is characterised in that,
Described water retaining is: taking acrylamide, 2-acrylamido-2-methyl propane sulfonic acid, vinylformic acid, (methyl) acrylyl oxy-ethyl-trimethyl salmiac and allyl polyethenoxy ether as the multipolymer of monomer;
The molecular structure of described allyl polyethenoxy ether is as follows:
CH2=CHCH2O(CH2CH2O)nH��
2. water retaining according to claim 1, it is characterised in that, the value of the n in described allyl polyethenoxy ether molecular structure is 6,12,18.
3. water retaining according to claim 2, it is characterised in that, the value of the n in described allyl polyethenoxy ether molecular structure is 18.
4. water retaining according to the arbitrary item of claim 1-3, it is characterised in that, in described water retaining, the part by weight of acrylamide is 30-40 part,
The part by weight of 2-acrylamido-2-methyl propane sulfonic acid is 30-50 part,
Acrylic acid part by weight is 2-8 part,
The part by weight of (methyl) acrylyl oxy-ethyl-trimethyl salmiac is 5-15 part,
The part by weight of allyl polyethenoxy ether is 3-10 part.
5. water retaining according to claim 4, it is characterised in that, in described water retaining,
The part by weight of acrylamide is 35-40 part,
The part by weight of 2-acrylamido-2-methyl propane sulfonic acid is 35-45 part,
Acrylic acid part by weight is 5-8 part,
The part by weight of (methyl) acrylyl oxy-ethyl-trimethyl salmiac is 10-15 part,
The part by weight of allyl polyethenoxy ether is 6-10 part.
6. water retaining according to the arbitrary item of claim 1-3, it is characterised in that, the number-average molecular weight of described water retaining is 80000-120000.
7. water retaining according to claim 6, it is characterised in that, the number-average molecular weight of described water retaining is 90000-110000.
8. an oil gas well cementing operation low hydration heat short-term strength cement water retaining, it is characterized in that, described water retaining is obtained by following preparation method: be the acrylamide of 30-40 part by part by weight, part by weight is the 2-acrylamido-2-methyl propane sulfonic acid of 30-50 part, part by weight is the vinylformic acid of 2-8 part, the allyl polyethenoxy ether of part by weight to be (methyl) acrylyl oxy-ethyl-trimethyl salmiac of 5-15 part and part by weight be 3-10 part is dissolved in deionized water, monomer adds sodium hydrate solid after dissolving completely, solution ph is adjusted to 6.5-7.5, then above-mentioned solution is joined in reaction vessel, after being warming up to 75 DEG C under nitrogen protection, add ammonium persulfate solution initiated polymerization, after temperature of reaction system is risen to 85 DEG C of reaction 2.5-3.5h, obtain the solution of described water retaining, after overcooling, drying, pulverizing, obtain the pulvis of described water retaining, the molecular structure of described allyl polyethenoxy ether is: CH2=CHCH2O(CH2CH2O)nH, wherein the value of n is 6,12,18.
9. water retaining according to claim 8, it is characterised in that, the value of the n in described allyl polyethenoxy ether molecular structure is 18.
10. water retaining according to claim 8 or claim 9, it is characterised in that,
The part by weight of described acrylamide is 35-40 part,
The part by weight of described 2-acrylamido-2-methyl propane sulfonic acid is 35-45 part,
Described acrylic acid part by weight is 5-8 part,
The part by weight of described (methyl) acrylyl oxy-ethyl-trimethyl salmiac is 10-15 part,
The part by weight of described allyl polyethenoxy ether is 6-10 part.
The preparation method of the oil gas well cementing operation low hydration heat short-term strength cement water retaining described in 11. 1 kinds of arbitrary items of claim 1-10, it is characterised in that, comprise the following steps:
Step (1), acryloyl, acrylamide, 2-acrylamido-2-methyl propane sulfonic acid, (methyl) acrylyl oxy-ethyl-trimethyl salmiac and allyl polyethenoxy ether are dissolved in deionized water according to the ratio that claim 1-10 limits, monomer adds sodium hydrate solid after dissolving completely, and solution ph is adjusted to 6.5-7.5; The molecular structure of described allyl polyethenoxy ether is: CH2=CHCH2O(CH2CH2O)nH, wherein the value of n is 6,12,18;
Step (2), joins in reaction vessel by step (1) gained solution, after being warming up to 75 DEG C under nitrogen protection, adds ammonium persulfate solution initiated polymerization;
Step (3), after temperature of reaction system rises to 85 DEG C of reaction 2.5-3.5h, obtains the solution of described water retaining, obtains the pulvis of described water retaining after overcooling, drying, pulverizing.
12. preparation methods according to claim 11, it is characterised in that, the part by weight of described ammonium persulphate is 0.5-1.5 part.
13. preparation methods according to claim 11, it is characterised in that, in reaction process, stirring velocity is 140-160 rev/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410721196.3A CN105646793B (en) | 2014-12-02 | 2014-12-02 | A kind of oil gas well cementing operation low hydration heat high-early (strength) cement fluid loss agent and preparation method |
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| CN110950996A (en) * | 2018-09-27 | 2020-04-03 | 中国石油化工股份有限公司 | Water plugging polymer and preparation method and application thereof |
| CN112391153A (en) * | 2019-08-16 | 2021-02-23 | 中国石油天然气集团有限公司 | Fluid loss agent and preparation method thereof |
| CN112521044A (en) * | 2020-12-04 | 2021-03-19 | 中国石油集团工程技术研究院有限公司 | Fluid loss agent suitable for aluminate cement slurry and preparation method thereof |
| CN115368088A (en) * | 2022-09-29 | 2022-11-22 | 李娜 | Preparation method of formed concrete |
| CN115505069A (en) * | 2021-06-07 | 2022-12-23 | 中国石油天然气集团有限公司 | Low-molecular-weight ultrahigh-temperature well cementation fluid loss agent and preparation method and application thereof |
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| CN110950996B (en) * | 2018-09-27 | 2021-12-31 | 中国石油化工股份有限公司 | Water plugging polymer and preparation method and application thereof |
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| CN115505069A (en) * | 2021-06-07 | 2022-12-23 | 中国石油天然气集团有限公司 | Low-molecular-weight ultrahigh-temperature well cementation fluid loss agent and preparation method and application thereof |
| CN115505069B (en) * | 2021-06-07 | 2024-02-06 | 中国石油天然气集团有限公司 | Low-molecular-weight ultrahigh-temperature well cementation fluid loss agent and preparation method and application thereof |
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