CN111807748A - High-temperature stabilizer for high-density cement slurry and preparation method thereof - Google Patents
High-temperature stabilizer for high-density cement slurry and preparation method thereof Download PDFInfo
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- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
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- 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
- C08F220/58—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine
- C08F220/585—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine and containing other heteroatoms, e.g. 2-acrylamido-2-methylpropane sulfonic acid [AMPS]
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
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Abstract
The invention discloses a high-temperature stabilizer for high-density cement slurry and a preparation method thereof, wherein the high-temperature stabilizer comprises 76-84 parts by weight of bentonite, 10-14 parts by weight of modified diutan and 6-10 parts by weight of cross-linked copolymer; modified pyridineThe excellent glue is obtained by graft copolymerization of sodium styrene sulfonate and 2-acrylamide-2-methylpropanesulfonic acid; the crosslinked copolymer is prepared by copolymerizing 2-acrylamide-2-methylpropanesulfonic acid, acrylamide, dimethyl diallyl ammonium chloride, N-vinyl caprolactam and divinylbenzene, and has a molecular weight of 7 × 105～9×105(ii) a The high-temperature stabilizer has the characteristics of high viscosity at low temperature and high-temperature tackifying, obviously improves the high-temperature stability of cement paste, solves the problem of poor high-temperature stability of the existing cement paste, has no adverse effect on the comprehensive performance of the cement paste, and meets the requirements of site construction; in addition, the stabilizer has the advantages of simple preparation method, controllable conditions, low cost and market popularization and application prospect in the aspect of preparation.
Description
Technical Field
The invention relates to the technical field of downhole operation of oil and gas fields, in particular to a high-temperature stabilizer for high-density cement slurry and a preparation method thereof.
Background
Deep oil and gas resources in China have become the main field of exploration and development. The cement slurry for high-temperature deep well cementing usually adopts soluble polymers as additives such as fluid loss additive, retarder and the like, and solves various problems of large high-temperature water loss, difficult adjustment of thickening time and the like. However, as the exploration and development progress to a deeper level, some defects of the water-soluble polymer are gradually exposed in the application process, which is mainly reflected in that the viscosity of the polymer is obviously reduced along with the increase of the temperature, the stability of a polymer system is weakened, the settlement of cement particles is aggravated, and the stability of a cement paste system is poor. High-density cement slurry contains a large amount of weighting materials, so that sedimentation and even severe layering are more likely to occur.
For high-density cement slurry, a particle grading mode is usually adopted to improve the stability of the cement slurry at present. The particle size distribution of the weighting material is reasonably designed, and superfine particles such as micro-silicon powder, micro-manganese powder and the like are introduced, so that the high-temperature stability of the high-density cement paste can be solved to a certain extent. However, after the density exceeds 2.40g/cm3 and the temperature exceeds 130 ℃, the stability of the high-density cement paste is difficult to maintain.
In order to further improve the stability of the high-density cement slurry, researchers have conducted studies from several aspects:
CN104263333A discloses a high-density cement slurry stabilizer, which is composed of 20-30% of non-metallic oxide, 65-75% of metallic oxide and 3-5% of asphalt micropowder. The high-temperature stability of the high-density cement slurry is improved mainly by a particle grading mode. However, the suspending agent is inorganic particles, and the problems of slurry thinning, poor stability and the like caused by the aggravation of self thermal motion of cement and aggravating materials in high-density cement slurry and the high-temperature thinning of polymer additives cannot be solved.
CN105176505A discloses a cement slurry stabilizer for well cementation and a preparation method thereof, wherein the cement slurry stabilizer comprises 54-89 parts by weight of quartz sand, 2-20 parts by weight of welan gum, 0-8 parts by weight of xanthan gum, 3-10 parts by weight of polyvinyl alcohol and 3-8 parts by weight of graft high polymer. The stabilizer can improve the stability of cement paste, including high-density cement paste, and has no adverse effect on other properties of the cement paste. However, the preparation process of the grafted high molecular polymer related in the stabilizer is complex, and the grafted high molecular polymer can be prepared only by multi-step reaction, which is not beneficial to industrial production.
Disclosure of Invention
The invention aims to provide a high-temperature stabilizer for high-density cement slurry, which can obviously improve the stability of the high-density cement slurry under the high-temperature condition.
The invention also aims to provide a preparation method of the high-temperature stabilizer for the high-density cement slurry.
Therefore, the technical scheme of the invention is as follows:
a high-temperature stabilizer for high-density cement slurry comprises, by weight, 70-90 parts of bentonite, 2-20 parts of modified diutan and 2-10 parts of cross-linked copolymer; the modified diutan is obtained by graft copolymerization of sodium styrene sulfonate and 2-acrylamide-2-methylpropanesulfonic acid; the crosslinked copolymer is prepared by copolymerizing 2-acrylamide-2-methylpropanesulfonic acid, acrylamide, dimethyl diallyl ammonium chloride, N-vinyl caprolactam and divinylbenzene, and has a molecular weight of 7 multiplied by 105～9×105。
Preferably, the high-temperature stabilizer for the high-density cement slurry comprises, by weight, 70-90 parts of bentonite, 2-20 parts of modified diutan and 2-10 parts of a cross-linked copolymer.
Preferably, the specific preparation steps of the modified diutan are as follows:
s1, slowly adding 10-14 parts by weight of diutan into 60-80 parts by weight of water, and continuously stirring the solution in the adding process at a stirring speed of 300-500 r/min;
s2, when the to-be-optimized gum is fully hydrated and is in a colloid state, adding 5-10 parts by weight of sodium p-styrenesulfonate and 5-10 parts by weight of 2-acrylamide-2-methylpropanesulfonic acid, continuously stirring until the sodium p-styrenesulfonate and the 2-acrylamide-2-methylpropanesulfonic acid are completely dissolved, and dropwise adding a NaOH solution until the pH of the solution is 5-5.5 to obtain a reaction mixed solution;
s3, heating the reaction mixed solution to 60 ℃, adding 0.2-0.5 part by weight of ammonium persulfate into the reaction mixed solution to carry out free radical polymerization reaction, and continuing to react for 4 hours, and then spray-drying the product to prepare uniform powder solid.
The modified diutan has the characteristic of high solution viscosity at a lower temperature, and chain rigid groups are introduced into the molecular structure of the diutan through modification: the sulfonate group effectively improves the stability of the solution under the high-temperature condition, so that the viscosity of the solution is less influenced by the temperature.
Preferably, the initiator I is ammonium persulfate.
Preferably, the preparation method of the crosslinked copolymer comprises the following steps:
s1, dissolving 40-50 parts by weight of 2-acrylamido-2-methylpropanesulfonic acid, 15-20 parts by weight of acrylamide, 5-10 parts by weight of dimethyldiallylammonium chloride, 25-35 parts by weight of N-vinylcaprolactam and 1-2 parts by weight of divinylbenzene in water to prepare a reaction mixed solution with the monomer mass fraction of 15-20%; wherein, the divinylbenzene is a cross-linking agent;
s2, adding sodium hydroxide or sodium carbonate into the reaction mixed solution, and adjusting the pH value of the solution to 7-9;
s3, adding 2-5 parts by weight of emulsifier into the reaction mixed liquid prepared in the step S2, heating to 40-60 ℃ after uniformly stirring, adding 0.5-1.0 part by weight of initiator II to initiate reaction, and continuously reacting for 4-6 hours to obtain a reaction product liquid;
s4, spray drying the reaction liquid to prepare uniform powdery solid for later use.
The chemical structural formula of the high-density cement slurry high-temperature stabilizer is as follows:
in the graft copolymerization, 2-acrylamide-2-methylpropanesulfonic acid contains water-soluble and strong anionic sulfonic groups, so that the copolymer has good salt resistance and thermal stability; acrylamide is a strong adsorption monomer, and can improve the molecular weight and viscosity of the copolymer; dimethyl diallyl ammonium chloride is a cationic monomer, a five-membered ring is formed on a main chain of a macromolecule after polymerization, the chain rigidity of the polymer is improved, an association structure is formed between anions and cations under the condition of low temperature, the polymer is curled, the association structure is destroyed at high temperature, a stable net structure can be formed between the polymers, and the polymers are fully adsorbed with cement particles to play a role in suspension; meanwhile, by introducing a temperature-sensitive monomer: n-isopropyl acrylamide or N-vinyl caprolactam ensures that the copolymer is easily dissolved in water at a low temperature lower than the critical phase transition temperature (LCST), intermolecular hydrogen bonds are gradually dissociated, and the viscosity of a polymer solution is low; as the temperature rises above the LCST, the temperature-sensitive groups begin to self-assemble to form an interchain hydrophobic structure, so that the viscosity of the polymer solution can be increased, and as the temperature rises, the self-assembly behavior is intensified, and the viscosity of the polymer gradually increases; after reaching a certain degree, the viscosity of the polymer solution is gradually reduced along with the increase of the temperature, because more temperature-sensitive groups participate in forming a hydrophobic region in a larger range above the temperature, the hydrophobic region of the polymer solution is too large, phase separation is caused, a network structure is weakened, the viscosity of the polymer solution is reduced, and the consistency of the cement slurry added with the stabilizer cannot be too high under the condition of higher temperature can be ensured; the addition of the crosslinking agent moderately crosslinks the polymer to form a network structure, and maintains stability under high temperature conditions.
Preferably, the emulsifier is sodium dodecyl sulfate, sodium dodecyl sulfonate or sodium dodecyl benzene sulfonate.
Preferably, the initiator II is a mixture of ammonium persulfate and sodium bisulfite with a molar ratio of 1: 1.
Preferably, the bentonite is OCMA type sodium bentonite.
In the high-temperature stabilizer for the high-density cement paste, the high viscosity and the high suspension capacity of the modified diutan and the thermal tackifying performance and the high-temperature suspension capacity of the crosslinked copolymer have synergistic effect, so that the stability of the high-density cement paste under the high-temperature condition can be obviously improved, and the problem of poor high-temperature stability of the existing cement paste is effectively solved; and the OCMA type sodium bentonite has certain capacity of suspending and weighting materials, so that the risk of uneven mixing caused by excessively small addition of the cross-linked copolymer and the diutan can be effectively reduced, and the operability of field application is improved.
The preparation method of the high-temperature stabilizer for the high-density cement slurry is simple, and comprises the following specific steps: and adding the bentonite into a double-helix conical mixing and stirring machine, sequentially adding the modified diutan and the cross-linked copolymer under the stirring condition, and continuously mixing and stirring for 1-2 h to obtain the high-temperature stabilizer for the high-density cement paste.
Compared with the prior art, the high-temperature stabilizer for the high-density cement paste is prepared by mixing OCMA type sodium bentonite, modified diutan and a cross-linked copolymer in proportion, wherein the high viscosity and the high suspension capacity of the modified diutan and the thermal tackifying performance and the high-temperature suspension capacity of the cross-linked copolymer have synergistic effect, so that the stabilizer has the characteristics of high viscosity at low temperature and high viscosity at high temperature, remarkably improves the high-temperature stability of the cement paste, solves the problem of poor high-temperature stability of the existing cement paste, has no adverse effect on the comprehensive performance of the cement paste, and meets the requirements of site construction; in addition, the stabilizer has the advantages of simple preparation method, controllable conditions, low cost and market popularization and application prospect in the aspect of preparation.
Drawings
FIG. 1 is a graph of 2.50g/cm prepared without adding example 2 of the present invention3A performance result schematic diagram of a shutdown experiment of the high-density cement slurry of the high-temperature stabilizer for the high-density cement slurry;
FIG. 2 shows a graph of 2.50g/cm prepared by adding the catalyst of example 2 of the present invention3Schematic diagram of performance results of shutdown experiments of high-density cement slurry prepared by using high-temperature stabilizer for high-density and high-density cement slurry.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, which are not intended to limit the invention in any way. In the following examples and comparative examples, sodium bentonite of the OCMA type and the raw materials for preparing the modified diutan and the crosslinked copolymer were purchased from commercially available products;
example 1
A high-temperature stabilizer for high-density cement slurry is prepared by the following steps:
1) slowly adding 15g of diutan into 80g of water, and continuously stirring the solution in the adding process, wherein the stirring speed is controlled between 300 and 500 r/min; when the undetermined excellent gum is fully hydrated and is in a colloid state, adding 10g of sodium p-styrene sulfonate and 5g of 2-acrylamide-2-methylpropanesulfonic acid, continuously stirring until the sodium p-styrene sulfonate and the 2-acrylamide-2-methylpropanesulfonic acid are completely dissolved, and dropwise adding a NaOH solution until the pH value of the solution is 5; heating the reaction solution to 60 ℃, adding 0.2g of ammonium persulfate to carry out free radical polymerization reaction, continuously reacting for 4 hours, and carrying out spray drying to prepare uniform powdery solid, namely the modified diutan;
2) 40g of 2-acrylamido-2-methylpropanesulfonic acid, 15g of acrylamide, 16.7g of dimethyldiallylammonium chloride (60% solution), 35g N-vinylcaprolactam and 2g of divinylbenzene were weighed and dissolved in 400g of water so that the monomer mass fraction in the resulting solution was 20%; adding sodium hydroxide to adjust the pH value of the solution to 7; adding 5g of sodium dodecyl sulfate, stirring uniformly, heating the reaction solution to 60 ℃, adding 0.6630g of ammonium persulfate and 0.3023g of sodium bisulfite, reacting for 6 hours, stopping the reaction, and spray drying to prepare uniform powdery solid for later use;
3) adding 76 parts by weight of OCMA type sodium bentonite into a double-spiral conical mixing machine, sequentially adding 14 parts by weight of modified diutan and 10 parts by weight of cross-linked copolymer under the stirring condition, and mixing for 2 hours to obtain the high-temperature cement slurry stabilizer.
Example 2
A high-temperature stabilizer for high-density cement slurry is prepared by the following steps:
1) slowly adding 12g of diutan into 70g of water, and continuously stirring the solution in the adding process, wherein the stirring speed is controlled between 300 and 500 r/min; when the undetermined excellent gum is fully hydrated and presents a colloidal state, 8g of sodium p-styrene sulfonate and 10g of 2-acrylamide-2-methylpropanesulfonic acid are added, the stirring is continued until the sodium p-styrene sulfonate and the 2-acrylamide-2-methylpropanesulfonic acid are completely dissolved, NaOH solution is dripped until the pH value of the solution is 5, the reaction solution is heated to 60 ℃, 0.3g of ammonium persulfate is added to initiate the reaction, and after the reaction is carried out for 4 hours, the uniform powdery solid is prepared for standby through spray drying;
2) 41.5g of 2-acrylamido-2-methylpropanesulfonic acid, 17.8g of acrylamide, 10.8g of dimethyldiallylammonium chloride (60% solution), 27.8g of N-vinylcaprolactam and 1.30g of divinylbenzene were weighed into 533g of water, so that the monomer mass fraction in the solution was 15%; adding sodium hydroxide to adjust the pH value of the solution to 8; adding 3.8g of sodium dodecyl sulfate, uniformly stirring, heating the reaction solution to 40 ℃, adding 0.3795g of ammonium persulfate and 0.1731g of sodium bisulfite, reacting for 4 hours, stopping the reaction, and spray-drying to prepare uniform powdery solid for later use;
3) adding 80 parts by weight of OCMA type sodium bentonite into a double-spiral conical mixing machine, sequentially adding 12 parts by weight of modified diutan and 8 parts by weight of cross-linked copolymer under the stirring condition, and mixing for 2 hours to obtain the high-temperature cement slurry stabilizer.
Example 3
A high-temperature stabilizer for high-density cement slurry is prepared by the following steps:
1) slowly adding 10g of diutan into 60g of water, and continuously stirring the solution in the adding process, wherein the stirring speed is controlled between 300 and 500 r/min; when the undetermined excellent gum is fully hydrated and is in a colloid state, adding 5g of sodium p-styrene sulfonate and 10g of 2-acrylamide-2-methylpropanesulfonic acid, continuously stirring until the sodium p-styrene sulfonate and the 2-acrylamide-2-methylpropanesulfonic acid are completely dissolved, and dropwise adding a NaOH solution until the pH value of the solution is 5.5 to obtain a reaction mixed solution; adding 0.5g of initiator I into the reaction mixed solution to carry out free radical polymerization reaction, continuously reacting for 4 hours, and spray drying to prepare uniform powdery solid, namely the modified diutan;
2) 50g of 2-acrylamido-2-methylpropanesulfonic acid, 20g of acrylamide, 8.34g of dimethyldiallylammonium chloride (60% solution), 25g N-vinylcaprolactam and 1g of divinylbenzene were weighed and dissolved in 476g of water so that the monomer mass fraction in the solution obtained was 17.5%; adding sodium hydroxide to adjust the pH value of the solution to 9; adding 2g of sodium dodecyl sulfate, uniformly stirring, heating the reaction solution to 50 ℃, adding 0.5050g of ammonium persulfate and 0.2303g of sodium bisulfite, reacting for 5 hours, stopping the reaction, and spray-drying to prepare uniform powdery solid for later use;
3) adding 84 parts by weight of OCMA type sodium bentonite into a double-spiral conical mixing machine, sequentially adding 10 parts by weight of modified diutan and 6 parts by weight of cross-linked copolymer under the stirring condition, and mixing for 2 hours to obtain the high-temperature cement slurry stabilizer.
As a result of the tests, in the above examples 1 to 3, the number average molecular weights of the crosslinked copolymers prepared in the step 2) were all 7X 105～9×105Within the range of (1).
And (3) performance testing:
and preparing cement paste according to GB/T19139-2012, and testing the properties of the prepared cement paste, such as density, dehydration, thickening time, compressive strength, free liquid, stability and the like. Evaluation by shutdown test 2.50g/cm3And (3) the stability of the high-density cement paste, wherein the motor of the densifier is closed in the cement paste thickening test process, the motor is started again after 20min, and the consistency change of the cement paste is observed so as to judge the sedimentation condition of the cement paste under the high-temperature condition.
The density was 2.30g/cm3The formula of the high-density cement slurry comprises: 100 parts of G-grade oil well cement, 30 parts of silicon powder, 7.5 parts of micro silicon, 95-105 parts of weighting agent I, 5 parts of micro manganese, 8 parts of filtrate reducer BH-F201L, 3 parts of retarder BH-R101L, 1 part of drag reducer BH-D301L, 0.2 part of defoaming agent BZXP-1+2 parts of high-temperature stabilizer, 10 parts of sodium chloride and 64 parts of water.
The density was 2.50g/cm3The high-density cement slurry formula comprises: 100 parts of G-grade oil well cement, 30 parts of silicon powder, 7.5 parts of micro silicon, 85-95 parts of weighting agent II, 40 parts of micro manganese, 8 parts of filtrate reducer BH-F201L, 3 parts of retarder BH-R101L, 1 part of drag reducer BH-D301L, 0.2 part of defoaming agent BZXP-1, 2.5 parts of high-temperature stabilizer, 9 parts of sodium chloride and 60 parts of water.
Wherein, G-grade oil well cement, silica powder, micro-silicon, weighting agent I, weighting agent II and sodium chloride in the cement slurry formula belong to commercial products, specifically, the weighting agent I is hematite powder with the density of 4.9-5.2G/cm3(ii) a The weighting agent II is nonmagnetic ferro-manganese alloy powder with the density of 7.0 to 7.6g/cm3(ii) a The micro manganese is MicroMAX of Norwegian Erken group; the fluid loss agent BH-F201L, the retarder BH-R101L, the drag reducer BH-D301L and the defoamer BZXP-1 are products of a second well cementation branch company of Bohai drilling engineering Co., Ltd, China Petroleum group; high temperature stabilizationThe agent is a high-temperature stabilizer for high-density cement paste prepared in examples 1-3 in the application. The cement paste stability and rheological property test results are shown in table 1 below. The comprehensive properties of the cement slurry such as water loss are shown in the following table 2.
Table 1:
table 2:
as can be seen from the test results of tables 1 and 2, the high-density cement slurry without the high-temperature stabilizer for high-density cement slurry of the present application has very poor stability at 150 ℃; specifically, the density was 2.30g/cm3The difference between the upper density and the lower density of the cement paste reaches 0.421g/cm3The free liquid reaches 1.3%; and a density of 2.50g/cm3The difference between the upper density and the lower density of the cement paste reaches 0.586g/cm3And the free liquid reaches 1.6 percent, and the requirements of site construction cannot be met. The stability of the high-density cement paste added with the high-temperature stabilizer for the high-density cement paste prepared in the embodiments 1 to 3 of the application is obviously enhanced, and the difference between the upper density and the lower density of the set cement is reduced to 0.023 to 0.034g/cm3And the free liquid is reduced to 0, so that the requirement of site construction on the stability of cement paste is met.
In addition, although the fluidity index of the high-density cement paste added with the high-temperature stabilizer for the high-density cement paste prepared in the embodiments 1 to 3 of the application is slightly reduced and the consistency coefficient is slightly increased, the influence is small, the cement paste still has good rheological property, the water loss of the cement paste can be effectively reduced when the temperature reaches 150 ℃, and the adverse effect on the performances such as the thickening time and the compressive strength of the cement paste is avoided.
FIG. 1 shows 2.50g/cm without the addition of the present invention3High temperature stabilizer for high density cement slurryPerformance result schematic diagram of shutdown experiment of density cement slurry. As can be seen from the test results in FIG. 1, after the high-density cement slurry without the high-temperature stabilizer for high-density cement slurry of the present invention is stopped for 20min, the motor is turned on again, the cement slurry flocculates, the consistency reaches 100Bc instantly, which indicates that the slurry is very unstable, a large amount of granular materials are deposited at the bottom of the slurry cup during the stop, and the consistency is too large when the machine is restarted.
FIG. 2 shows that 2.50g/cm prepared in example 2 of the present invention was added3Schematic diagram of performance results of shutdown experiments of high-density cement slurry prepared by using high-temperature stabilizer for high-density cement slurry. From the test results of fig. 2, it can be seen that the high-density cement slurry prepared by adding the high-temperature stabilizer for high-density cement slurry prepared in example 2 of the present invention is stopped for 20min, the motor is turned on again, the consistency of the cement slurry is increased to 23Bc, and the consistency is not more than 40Bc in the whole thickening process, which indicates that the slurry has good stability and no sedimentation occurs during the stopping process.
Claims (8)
1. The high-temperature stabilizer for the high-density cement slurry is characterized by comprising 76-84 parts by weight of bentonite, 10-14 parts by weight of modified diutan and 6-10 parts by weight of cross-linked copolymer; the modified diutan is obtained by graft copolymerization of sodium styrene sulfonate and 2-acrylamide-2-methylpropanesulfonic acid; the crosslinked copolymer is prepared by copolymerizing 2-acrylamide-2-methylpropanesulfonic acid, acrylamide, dimethyl diallyl ammonium chloride, N-vinyl caprolactam and divinylbenzene, and has a molecular weight of 7 multiplied by 105～9×105。
2. The high-temperature stabilizer for high-density cement slurry as claimed in claim 1, wherein the modified diutan is prepared by the following steps:
s1, slowly adding 10-15 parts by weight of diutan into 60-80 parts by weight of water, and continuously stirring the solution in the adding process at a stirring speed of 300-500 r/min;
s2, when the to-be-optimized gum is fully hydrated and is in a colloid state, adding 5-10 parts by weight of sodium p-styrenesulfonate and 5-10 parts by weight of 2-acrylamide-2-methylpropanesulfonic acid, continuously stirring until the sodium p-styrenesulfonate and the 2-acrylamide-2-methylpropanesulfonic acid are completely dissolved, and dropwise adding a NaOH solution until the pH of the solution is 5-5.5 to obtain a reaction mixed solution;
and S3, heating the reaction mixed solution to 60 ℃, adding 0.2-0.5 part by weight of an initiator I into the reaction mixed solution to perform free radical polymerization, continuously reacting for 4 hours, and performing spray drying to prepare uniform powdery solid for later use.
3. The high-temperature stabilizer for high-density cement slurry according to claim 2, wherein the initiator I is ammonium persulfate.
4. The high-temperature stabilizer for high-density cement slurry according to claim 1, wherein the preparation method of the crosslinked copolymer comprises the following steps:
s1, dissolving 40-50 parts by weight of 2-acrylamido-2-methylpropanesulfonic acid, 15-20 parts by weight of acrylamide, 5-10 parts by weight of dimethyldiallylammonium chloride, 25-35 parts by weight of N-vinylcaprolactam and 1-2 parts by weight of divinylbenzene in water to obtain a reaction mixed solution with the monomer mass fraction of 15-20%;
s2, adding sodium hydroxide or sodium carbonate into the reaction mixed solution, and adjusting the pH value of the solution to 7-9;
s3, adding 2-5 parts by weight of emulsifier into the reaction mixed liquid prepared in the step S2, heating to 40-60 ℃ after uniformly stirring, adding 0.5-1.0 part by weight of initiator II to initiate reaction, and continuously reacting for 4-6 hours to obtain a reaction product liquid;
s4, spray drying the reaction liquid to prepare uniform powdery solid for later use.
5. The high temperature stabilizer for high density cement slurry according to claim 4, wherein the emulsifier is sodium dodecyl sulfate, sodium dodecyl sulfonate or sodium dodecyl benzene sulfonate.
6. The high-temperature stabilizer for high-density cement slurry according to claim 4, wherein the initiator II is a mixture of ammonium persulfate and sodium bisulfite with a molar ratio of 1: 1.
7. The high-temperature stabilizer for high-density cement slurry according to claim 1, wherein the bentonite is an OCMA type sodium bentonite.
8. The high-temperature stabilizer for high-density cement slurry as claimed in claim 1, wherein the preparation method comprises: and adding the bentonite into a double-helix conical mixing and stirring machine, sequentially adding the modified diutan and the cross-linked copolymer under the stirring condition, and continuously mixing and stirring for 1-2 h to obtain the high-temperature stabilizer for the high-density cement paste.
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Cited By (4)
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|---|---|---|---|---|
| CN112724413A (en) * | 2021-01-08 | 2021-04-30 | 西南石油大学 | Preparation method of temperature-sensitive tackifying type suspending agent for well cementation cement slurry |
| CN114214048A (en) * | 2022-01-07 | 2022-03-22 | 西南石油大学 | High-temperature-resistant suspension stabilizer for well cementation working fluid and preparation method thereof |
| CN114436500A (en) * | 2022-01-27 | 2022-05-06 | 爱环吴世（苏州）环保股份有限公司 | Functional composite flocculant for sludge and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112724413A (en) * | 2021-01-08 | 2021-04-30 | 西南石油大学 | Preparation method of temperature-sensitive tackifying type suspending agent for well cementation cement slurry |
| CN116444219A (en) * | 2022-01-05 | 2023-07-18 | 中国石油天然气集团有限公司 | High-temperature-resistant salt-resistant high-density channeling-preventing oil well cement slurry and preparation method thereof |
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| CN114214048B (en) * | 2022-01-07 | 2023-04-25 | 西南石油大学 | High-temperature-resistant suspension stabilizer for well cementation working fluid and preparation method thereof |
| CN114436500A (en) * | 2022-01-27 | 2022-05-06 | 爱环吴世（苏州）环保股份有限公司 | Functional composite flocculant for sludge and preparation method thereof |
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Application publication date: 20201023 |