CN116814227B - A latex plugging agent for drilling fluid and preparation method thereof - Google Patents
A latex plugging agent for drilling fluid and preparation method thereof Download PDFInfo
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- CN116814227B CN116814227B CN202211734039.7A CN202211734039A CN116814227B CN 116814227 B CN116814227 B CN 116814227B CN 202211734039 A CN202211734039 A CN 202211734039A CN 116814227 B CN116814227 B CN 116814227B
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- 239000004816 latex Substances 0.000 title claims abstract description 126
- 229920000126 latex Polymers 0.000 title claims abstract description 126
- 238000005553 drilling Methods 0.000 title claims abstract description 72
- 239000012530 fluid Substances 0.000 title claims abstract description 72
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 49
- 238000002360 preparation method Methods 0.000 title abstract description 27
- 239000003381 stabilizer Substances 0.000 claims abstract description 44
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical class OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims abstract description 38
- 150000002148 esters Chemical class 0.000 claims abstract description 35
- 239000002904 solvent Substances 0.000 claims abstract description 31
- 239000002270 dispersing agent Substances 0.000 claims abstract description 30
- 239000002994 raw material Substances 0.000 claims abstract description 26
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims abstract description 24
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229920001467 poly(styrenesulfonates) Polymers 0.000 claims abstract description 24
- 229940006186 sodium polystyrene sulfonate Drugs 0.000 claims abstract description 21
- MOVBJUGHBJJKOW-UHFFFAOYSA-N methyl 2-amino-5-methoxybenzoate Chemical compound COC(=O)C1=CC(OC)=CC=C1N MOVBJUGHBJJKOW-UHFFFAOYSA-N 0.000 claims abstract description 20
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 claims abstract description 18
- -1 alkylbenzene sulfonate Chemical class 0.000 claims abstract description 18
- CLAHOZSYMRNIPY-UHFFFAOYSA-N 2-hydroxyethylurea Chemical compound NC(=O)NCCO CLAHOZSYMRNIPY-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229940031575 hydroxyethyl urea Drugs 0.000 claims abstract description 12
- UQEAIHBTYFGYIE-UHFFFAOYSA-N hexamethyldisiloxane Chemical compound C[Si](C)(C)O[Si](C)(C)C UQEAIHBTYFGYIE-UHFFFAOYSA-N 0.000 claims abstract description 11
- NQSLZEHVGKWKAY-UHFFFAOYSA-N 6-methylheptyl 2-methylprop-2-enoate Chemical compound CC(C)CCCCCOC(=O)C(C)=C NQSLZEHVGKWKAY-UHFFFAOYSA-N 0.000 claims abstract description 4
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000000945 filler Substances 0.000 claims description 34
- 239000002243 precursor Substances 0.000 claims description 22
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 13
- 229920000289 Polyquaternium Polymers 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- YRIUSKIDOIARQF-UHFFFAOYSA-N dodecyl benzenesulfonate Chemical compound CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 YRIUSKIDOIARQF-UHFFFAOYSA-N 0.000 claims description 11
- 229940071161 dodecylbenzenesulfonate Drugs 0.000 claims description 11
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 8
- WZXYXXWJPMLRGG-UHFFFAOYSA-N hexadecyl benzenesulfonate Chemical compound CCCCCCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 WZXYXXWJPMLRGG-UHFFFAOYSA-N 0.000 claims description 8
- 229920001909 styrene-acrylic polymer Polymers 0.000 claims description 7
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 6
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 6
- 239000004202 carbamide Substances 0.000 claims description 6
- FPGGTKZVZWFYPV-UHFFFAOYSA-M tetrabutylammonium fluoride Chemical compound [F-].CCCC[N+](CCCC)(CCCC)CCCC FPGGTKZVZWFYPV-UHFFFAOYSA-M 0.000 claims description 6
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 5
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 4
- 239000005543 nano-size silicon particle Substances 0.000 claims description 3
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- 239000011787 zinc oxide Substances 0.000 claims description 3
- 229920002943 EPDM rubber Polymers 0.000 claims description 2
- 150000002825 nitriles Chemical class 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 1
- 238000000034 method Methods 0.000 claims 1
- 239000002114 nanocomposite Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 5
- 230000000052 comparative effect Effects 0.000 description 34
- 238000003756 stirring Methods 0.000 description 18
- 238000006243 chemical reaction Methods 0.000 description 10
- 239000000203 mixture Substances 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 6
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical group CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 6
- 239000008367 deionised water Substances 0.000 description 5
- 229910021641 deionized water Inorganic materials 0.000 description 5
- 239000012467 final product Substances 0.000 description 5
- 229940073561 hexamethyldisiloxane Drugs 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 239000002981 blocking agent Substances 0.000 description 4
- 230000002209 hydrophobic effect Effects 0.000 description 4
- 239000000178 monomer Substances 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- BTMZHHCFEOXAAN-UHFFFAOYSA-N 2-[bis(2-hydroxyethyl)amino]ethanol;2-dodecylbenzenesulfonic acid Chemical compound OCCN(CCO)CCO.CCCCCCCCCCCCC1=CC=CC=C1S(O)(=O)=O BTMZHHCFEOXAAN-UHFFFAOYSA-N 0.000 description 3
- 150000003863 ammonium salts Chemical group 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 3
- 229960002796 polystyrene sulfonate Drugs 0.000 description 3
- 239000011970 polystyrene sulfonate Substances 0.000 description 3
- 229940105956 tea-dodecylbenzenesulfonate Drugs 0.000 description 3
- 239000000872 buffer Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 239000003995 emulsifying agent Substances 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000003999 initiator Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- WBIQQQGBSDOWNP-UHFFFAOYSA-N 2-dodecylbenzenesulfonic acid Chemical compound CCCCCCCCCCCCC1=CC=CC=C1S(O)(=O)=O WBIQQQGBSDOWNP-UHFFFAOYSA-N 0.000 description 1
- 229920002907 Guar gum Polymers 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 150000004996 alkyl benzenes Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 229940077388 benzenesulfonate Drugs 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 125000001951 carbamoylamino group Chemical group C(N)(=O)N* 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 229940060296 dodecylbenzenesulfonic acid Drugs 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 239000000665 guar gum Substances 0.000 description 1
- 235000010417 guar gum Nutrition 0.000 description 1
- 229960002154 guar gum Drugs 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000003223 protective agent Substances 0.000 description 1
- 230000001603 reducing effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 239000000230 xanthan gum Substances 0.000 description 1
- 235000010493 xanthan gum Nutrition 0.000 description 1
- 229920001285 xanthan gum Polymers 0.000 description 1
- 229940082509 xanthan gum Drugs 0.000 description 1
Classifications
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
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- Compositions Of Macromolecular Compounds (AREA)
Abstract
The application relates to the technical field of plugging agents, and particularly discloses a latex plugging agent for drilling fluid and a preparation method thereof. The latex plugging agent for the drilling fluid is mainly prepared from the following raw materials in parts by weight: 80-100 parts of latex, 10-15 parts of esters, 5-12 parts of acrylic acid, 3-6 parts of sodium polystyrene sulfonate, 2-5 parts of nanofiller, 1-2 parts of tetramethyl ammonium fluoride, 0.5-1 part of dispersing agent, 5-10 parts of stabilizer and 20-35 parts of solvent; the esters are one of vinyl acetate, methyl acrylate and isooctyl methacrylate; the stabilizer consists of triethanolamine salt of alkylbenzene sulfonate, hydroxyethyl urea and hexamethyldisiloxane in the molar ratio of (5-8) (1.2-1.75) (3-5). The latex plugging agent for drilling fluid has the advantages of strong plugging effect and good rheological property.
Description
Technical Field
The application relates to the technical field of plugging agents, in particular to a latex plugging agent for drilling fluid and a preparation method thereof.
Background
At present, along with the development of oil and gas exploration, the encountered stratum structure is more and more complex, for example, a hard brittle multi-fracture stratum is a collapse-prone stratum commonly encountered in petroleum drilling, the hydration expansion and dispersion of the stratum are characterized by small expansion after encountering water, the trend of dispersing into fine particles is also small, at the moment, the pore pressure of a well wall zone is increased when the drilling fluid pressure in a well bore is transferred into the multi-fracture well wall stratum, and when the stress is increased to the damage limit of the rock, the collapse of the well wall rock is unavoidable.
Thus, preventing fluid from entering the borehole wall fissures is critical to prevent collapse, although many drilling fluids currently have natural wall building properties that can prevent or slow the rate of fluid entry to some extent. However, the pore and fracture sizes of long open hole rock sections vary widely, and solid phase particle size and grading in drilling fluids tend to be difficult to plug all formations from a broad spectrum of angles.
For the problems, the technical staff develops the latex plugging agent, and the latex plugging agent has the advantages of low fluorescence level and strong temperature resistance. Chinese patent application publication No. CN105884954a discloses a temperature-resistant and salt-resistant latex blocking agent, which is prepared from the following raw materials including hydrophobic monomer, hydrophilic monomer, emulsifier, buffer, molecular weight regulator, protectant, initiator and deionized water; wherein, relative to 100 weight parts of the hydrophobic monomer, the content of the hydrophilic monomer is 0.5 to 25 weight parts, the content of the emulsifier is 0.1 to 10 weight parts, the content of the buffer is 0.01 to 5.5 weight parts, the content of the molecular weight regulator is 0.01 to 4.5 weight parts, the content of the protective agent is 0.01 to 6.9 weight parts, the content of the initiator is 0.01 to 2.3 weight parts, and the plugging and water loss reducing effects are better.
Aiming at the latex plugging agent containing more hydrophobic and emulsifying components, the foaming instability of the drilling fluid system is easily initiated, and the rheological property is reduced.
Disclosure of Invention
In order to solve the problem of poor rheological property of the latex plugging agent after being mixed with drilling fluid, the application provides the latex plugging agent for the drilling fluid and a preparation method thereof.
In a first aspect, the application provides a latex plugging agent for drilling fluid, which adopts the following technical scheme:
The latex plugging agent for the drilling fluid is mainly prepared from the following raw materials in parts by weight: 80-100 parts of latex, 10-15 parts of esters, 5-12 parts of acrylic acid, 3-6 parts of sodium polystyrene sulfonate, 2-5 parts of nanofiller, 1-2 parts of tetramethyl ammonium fluoride, 0.5-1 part of dispersing agent, 5-10 parts of stabilizer and 20-35 parts of solvent; the esters are one of vinyl acetate, methyl acrylate and isooctyl methacrylate; the stabilizer consists of triethanolamine salt of alkylbenzene sulfonate, hydroxyethyl urea and hexamethyldisiloxane in the molar ratio of (5-8) (1.2-1.75) (3-5).
By adopting the technical scheme, latex, esters, acrylic acid and solvent are mixed and reacted to form an emulsion film forming system, latex particles in the film forming system can be crosslinked and cohered to form a plugging framework, and then the plugging framework plays a good role in plugging cracks of a well wall stratum. And meanwhile, the nano filler, the polystyrene and the tetramethyl ammonium fluoride are uniformly dispersed in the film forming system under the action of the dispersing agent, then the finer gaps are filled, the compactness of the plugging skeleton structure is improved, and the adhesion plugging effect of the latex film forming system on the rock is improved. And the triethanolamine salt of alkylbenzene sulfonate in the stabilizer is crosslinked and grafted with the film forming system, so that the rheological property of the film forming system is improved by utilizing larger steric hindrance of the stabilizer, the size matching property between the stabilizer and the tiny cracks of the stratum is better, the stabilizer can permeate into the deep inside of the cracks, and the stabilizer has better plugging effect. In addition, the hydroxyethyl urea and the hexamethyldisiloxane have polar groups such as ether bond, ureido and the like on molecules, so that stable dispersion of the triethanolamine salt of the alkylbenzene sulfonate in a film forming system can be assisted, the probability of foaming and segregation of the film forming system is reduced, and the stable physicochemical plugging agent has better compatibility when being mixed with drilling fluid for use, can be used for stably plugging micro cracks of a well wall stratum, and improves the stability of a plugging structure.
Preferably, the triethanolamine salt of alkylbenzene sulfonate is at least one of triethanolamine salt of dodecylbenzene sulfonate and triethanolamine salt of hexadecylbenzene sulfonate.
By adopting the technical scheme, the variety of the triethanolamine salt of the alkylbenzene sulfonate is optimized and adjusted, and proper steric hindrance is selected to improve the crosslinking state in the film forming system, so that the rheological property of the film forming system is further improved.
Preferably, the triethanolamine salt of alkylbenzene sulfonate consists of triethanolamine salt of dodecylbenzene sulfonate and triethanolamine salt of hexadecylbenzene sulfonate according to the molar ratio of (7-15) to (3-8).
By adopting the technical scheme, the proportion of the triethanolamine dodecyl benzene sulfonate and the triethanolamine hexadecyl benzene sulfonate is further tested, the steric hindrance and the cohesiveness are balanced, the interface state of a film forming system is improved, and the plugging performance of the plugging agent is improved.
Preferably, the mass ratio of the latex to the stabilizer is (8-10): 1.
By adopting the technical scheme, the proportion of the latex to the stabilizer is optimized and regulated, the rheological property of the latex film-forming system is ensured, the adhesiveness and the blocking property are not greatly influenced, and the overall comprehensive property of the blocking agent is improved.
Preferably, the nano filler is at least one of nano calcium carbonate, nano barium sulfate, nano calcium sulfate, nano silicon dioxide and nano zinc oxide.
By adopting the technical scheme, the types of the nano-fillers are optimized and adjusted, so that on one hand, the compatibility of the nano-fillers and a film forming system is improved, and the probability of agglomeration of the nano-fillers is reduced. On the other hand, the grading state of the nano filler is better, and the plugging effect of the film forming system on the micro cracks is improved.
Preferably, the solvent consists of water, urea and dimethyl sulfoxide according to the mass ratio of (10-15) (0.2-0.5) (0.8-1.5).
By adopting the technical scheme, the compatibility of each component in the latex film forming system is promoted by testing and adjusting the composition ratio of the solvent, the stability of the film forming system is improved, and the rheological property is not easy to be reduced due to the change of the environment.
Preferably, the raw materials also comprise 1.5-2 parts by weight of polyquaternium.
By adopting the technical scheme, after the polyquaternary ammonium salt is added, the molecules of the polyquaternary ammonium salt are provided with a hydrophilic main chain and a hydrophobic long chain, long chain winding and association occur in a film forming system, so that the hydrodynamic volume in the film forming system is increased, and the rheological property and the plugging property of the latex film forming system are further improved.
In a second aspect, the application provides a preparation method of a latex plugging agent for drilling fluid, which adopts the following technical scheme:
a preparation method of a latex plugging agent for drilling fluid comprises the following steps:
s1: uniformly mixing latex, esters, acrylic acid, tetrabutylammonium fluoride and a solvent according to the formula amount to prepare a precursor solution;
S2: and uniformly mixing the precursor liquid, sodium polystyrene sulfonate, nano filler, dispersing agent and stabilizing agent.
By adopting the technical scheme, the latex, esters, acrylic acid, tetrabutylammonium fluoride and solvent are firstly mixed to prepare uniform precursor liquid, and then the precursor liquid is further mixed with components such as a stabilizer for reaction, so that a latex film-forming system with good rheological property is formed, and a good plugging effect is achieved on the well wall stratum cracks.
Preferably, the step S2 further includes a step of adding a polyquaternium.
In summary, the application has the following beneficial effects:
1. the application adopts the latex, esters, acrylic acid and solvent to form a latex film-forming system by mixing reaction, and forms a winding grafting structure in the latex film-forming system after adding the stabilizing agent, thereby greatly improving the rheological property and the plugging property of the film-forming system.
2. In the application, the triethanolamine salt of the alkyl benzene sulfonate with proper steric hindrance is preferably adopted to further improve the interface state and rheological property of the latex film forming system.
3. The latex plugging for the drilling fluid prepared by the preparation method can be used for the drilling fluid for complex stratum, and has good rheological property and plugging property.
Detailed Description
The present application will be described in further detail with reference to examples.
The raw materials of the examples and comparative examples of the present application are commercially available in general except for the specific descriptions.
Examples
Example 1
The latex plugging agent for the drilling fluid is prepared from the following raw materials in parts by weight: 100kg of latex, 10kg of esters, 5kg of acrylic acid, 6kg of sodium polystyrene sulfonate, 2kg of nano filler, 1kg of tetramethyl ammonium fluoride, 1kg of dispersing agent, 5kg of stabilizer and 35kg of solvent; the stabilizer consists of triethanolamine salt of dodecylbenzene sulfonate, hydroxyethyl urea and hexamethyldisiloxane according to a molar ratio of 5:1.75:3.
Wherein the latex is styrene-acrylic latex. The esters are methyl acrylate. The nano filler is nano calcium carbonate. The dispersing agent is butyl acetate. The solvent is deionized water.
The preparation method of the latex plugging agent for the drilling fluid comprises the following steps:
S1: adding the latex, esters, acrylic acid, tetramethyl ammonium fluoride and solvent in the formula amount into a reaction kettle, uniformly mixing, and then heating to 80 ℃ to react for 20min at a stirring speed of 150rpm to obtain a precursor solution;
S2: adding sodium polystyrene sulfonate, nano filler, dispersing agent and stabilizing agent into the precursor solution, and continuously stirring for 90min to obtain the final product.
Example 2
The latex plugging agent for the drilling fluid is prepared from the following raw materials in parts by weight: 80kg of latex, 15kg of esters, 12kg of acrylic acid, 3kg of sodium polystyrene sulfonate, 5kg of nano filler, 2kg of tetramethyl ammonium fluoride, 0.5kg of dispersing agent, 10kg of stabilizer and 20kg of solvent; the stabilizer consists of triethanolamine salt of dodecylbenzene sulfonate, hydroxyethyl urea and hexamethyldisiloxane according to a molar ratio of 5:1.75:3.
Wherein the latex is carboxylated nitrile latex. The esters are vinyl acetate. The nano filler is nano silicon dioxide. The dispersing agent is xanthan gum. The solvent is water.
The preparation method of the latex plugging agent for the drilling fluid comprises the following steps:
S1: adding the latex, esters, acrylic acid, tetramethyl ammonium fluoride and solvent in the formula amount into a reaction kettle, uniformly mixing, and then heating to 90 ℃ to react for 30min at the stirring speed of 200rpm to obtain a precursor solution;
S2: adding sodium polystyrene sulfonate, nano filler, dispersing agent and stabilizing agent into the precursor solution, and continuously stirring for 150min to obtain the final product.
Example 3
The latex plugging agent for the drilling fluid is prepared from the following raw materials in parts by weight: 90kg of latex, 12kg of esters, 10kg of acrylic acid, 3.5kg of sodium polystyrene sulfonate, 3.5kg of nano-filler, 1.2kg of tetramethyl ammonium fluoride, 0.8kg of dispersing agent, 8.5kg of stabilizer and 25kg of solvent; the stabilizer consists of triethanolamine salt of dodecylbenzene sulfonate, hydroxyethyl urea and hexamethyldisiloxane according to a molar ratio of 5:1.75:3.
Wherein the latex is ethylene propylene diene monomer latex. The esters are isooctyl methacrylate. The nano filler is nano barium sulfate. The dispersing agent is guar gum. The solvent consists of deionized water and urea according to the mass ratio of 20:0.3.
The preparation method of the latex plugging agent for the drilling fluid comprises the following steps:
s1: adding the latex, esters, acrylic acid, tetramethyl ammonium fluoride and solvent in the formula amount into a reaction kettle, uniformly mixing, and then heating to 85 ℃ to react for 25 minutes at the stirring speed of 180rpm to obtain a precursor solution;
S2: adding sodium polystyrene sulfonate, nano filler, dispersing agent and stabilizing agent into the precursor solution, and continuously stirring for 120min to obtain the final product.
Example 4
The latex plugging for drilling fluids of this example differs from that of example 3 in that: the stabilizer in the raw materials consists of triethanolamine dodecylbenzenesulfonate, hydroxyethyl urea and hexamethyldisiloxane in a molar ratio of 8:1.2:5, and the rest is the same as in example 3.
The preparation method of the latex plugging agent for drilling fluid of this example is the same as that of example 3.
Example 5
The latex plugging for drilling fluids of this example differs from that of example 3 in that: the stabilizer in the raw materials consists of triethanolamine dodecylbenzenesulfonate, hydroxyethyl urea and hexamethyldisiloxane in a molar ratio of 5.5:1.3:4.2, and the rest is the same as in example 3.
The preparation method of the latex plugging agent for drilling fluid of this example is the same as that of example 3.
Example 6
The latex plugging for drilling fluids of this example differs from that of example 5 in that: the triethanolamine salt of alkylbenzene sulfonate in the raw material was triethanolamine salt of hexadecyl benzene sulfonate, and the rest was the same as in example 5.
The preparation method of the latex plugging for drilling fluid of this example is the same as that of example 5.
Example 7
The latex plugging for drilling fluids of this example differs from that of example 5 in that: the raw materials of the triethanolamine salt of alkylbenzene sulfonate comprise triethanolamine salt of dodecylbenzene sulfonate and triethanolamine salt of hexadecyl benzene sulfonate according to the mol ratio of 7:8, and the rest is the same as in example 5.
The preparation method of the latex plugging for drilling fluid of this example is the same as that of example 5.
Example 8
The latex plugging for drilling fluids of this example differs from that of example 5 in that: the raw materials of the triethanolamine salt of alkylbenzene sulfonate comprise triethanolamine salt of dodecylbenzene sulfonate and triethanolamine salt of hexadecyl benzene sulfonate according to the mol ratio of 15:3, and the rest is the same as in example 5.
The preparation method of the latex plugging for drilling fluid of this example is the same as that of example 5.
Example 9
The latex plugging for drilling fluids of this example differs from that of example 8 in that: the nano-filler in the raw materials consists of nano-calcium sulfate and nano-zinc oxide according to the mass ratio of 2:1, and the rest is the same as in example 8.
The preparation method of the latex plugging for drilling fluid of this example is the same as that of example 8.
Example 10
The latex plugging for drilling fluids of this example differs from that of example 9 in that: the raw materials comprise water, urea and dimethyl sulfoxide according to a mass ratio of 15:2:0.8, and the rest is the same as in example 9.
The preparation method of the latex plugging for drilling fluid of this example is the same as that of example 9.
Example 11
The latex plugging for drilling fluids of this example differs from that of example 9 in that: the raw materials comprise water, urea and dimethyl sulfoxide according to the mass ratio of 10:3.5:1.5, and the rest is the same as in example 9.
The preparation method of the latex plugging for drilling fluid of this example is the same as that of example 9.
Example 12
The latex plugging for drilling fluids of this example differs from that of example 10 in that: the raw material also comprises 1.5kg of polyquaternium, wherein the polyquaternium is polyquaternium 10, and the rest is the same as the example 10.
The preparation method of the latex plugging agent for the drilling fluid comprises the following steps:
s1: adding the latex, esters, acrylic acid, tetramethyl ammonium fluoride and solvent in the formula amount into a reaction kettle, uniformly mixing, and then heating to 85 ℃ to react for 25 minutes at the stirring speed of 180rpm to obtain a precursor solution;
S2: adding sodium polystyrene sulfonate, nano filler, dispersing agent, stabilizer and polyquaternium into the precursor solution, and continuously stirring for 120min to obtain the modified polystyrene sulfonate.
Example 13
The latex plugging for drilling fluids of this example differs from that of example 10 in that: the raw material also comprises 2kg of polyquaternium, wherein the polyquaternium is polyquaternium 10, and the rest is the same as the example 10.
The preparation method of the latex plugging agent for the drilling fluid comprises the following steps:
s1: adding the latex, esters, acrylic acid, tetramethyl ammonium fluoride and solvent in the formula amount into a reaction kettle, uniformly mixing, and then heating to 85 ℃ to react for 25 minutes at the stirring speed of 180rpm to obtain a precursor solution;
S2: adding sodium polystyrene sulfonate, nano filler, dispersing agent, stabilizer and polyquaternium into the precursor solution, and continuously stirring for 120min to obtain the modified polystyrene sulfonate.
Comparative example
Comparative example 1
The latex plugging agent for the drilling fluid of the comparative example is prepared from the following raw materials in parts by weight: 105kg of latex, 10kg of esters, 5kg of acrylic acid, 6kg of sodium polystyrene sulfonate, 2kg of nano filler, 1kg of tetramethyl ammonium fluoride, 1kg of dispersing agent and 35kg of solvent.
Wherein the latex is styrene-acrylic latex. The esters are methyl acrylate. The nano filler is nano calcium carbonate. The dispersing agent is butyl acetate.
The preparation method of the latex plugging agent for the drilling fluid of the comparative example comprises the following steps:
S1: adding the latex, esters, acrylic acid, tetramethyl ammonium fluoride and solvent in the formula amount into a reaction kettle, uniformly mixing, and then heating to 80 ℃ to react for 20min at a stirring speed of 150rpm to obtain a precursor solution;
S2: adding sodium polystyrene sulfonate, nano filler and dispersing agent into the precursor solution, and continuously stirring for 90min to obtain the modified polystyrene sulfonate.
Comparative example 2
The latex plugging agent for the drilling fluid of the comparative example is prepared from the following raw materials in parts by weight: 100kg of latex, 10kg of esters, 5kg of acrylic acid, 6kg of sodium polystyrene sulfonate, 2kg of nano filler, 1kg of tetramethyl ammonium fluoride, 1kg of dispersing agent, 5kg of stabilizer and 35kg of solvent; the stabilizer is triethanolamine salt of dodecylbenzene sulfonic acid.
Wherein the latex is styrene-acrylic latex. The esters are methyl acrylate. The nano filler is nano calcium carbonate. The dispersing agent is butyl acetate.
The preparation method of the latex plugging agent for the drilling fluid of the comparative example comprises the following steps:
S1: adding the latex, esters, acrylic acid, tetramethyl ammonium fluoride and solvent in the formula amount into a reaction kettle, uniformly mixing, and then heating to 80 ℃ to react for 20min at a stirring speed of 150rpm to obtain a precursor solution;
S2: adding sodium polystyrene sulfonate, nano filler, dispersing agent and stabilizing agent into the precursor solution, and continuously stirring for 90min to obtain the final product.
Comparative example 3
The latex plugging agent for the drilling fluid of the comparative example is prepared from the following raw materials in parts by weight: 100kg of latex, 10kg of esters, 5kg of acrylic acid, 6kg of sodium polystyrene sulfonate, 2kg of nano filler, 1kg of tetramethyl ammonium fluoride, 1kg of dispersing agent, 5kg of stabilizer and 35kg of solvent; the stabilizer consists of hydroxyethyl urea and hexamethyldisiloxane according to the mol ratio of 1.75:3.
Wherein the latex is styrene-acrylic latex. The esters are methyl acrylate. The nano filler is nano calcium carbonate. The dispersing agent is butyl acetate.
The preparation method of the latex plugging agent for the drilling fluid of the comparative example comprises the following steps:
S1: adding the latex, esters, acrylic acid, tetramethyl ammonium fluoride and solvent in the formula amount into a reaction kettle, uniformly mixing, and then heating to 80 ℃ to react for 20min at a stirring speed of 150rpm to obtain a precursor solution;
S2: adding sodium polystyrene sulfonate, nano filler, dispersing agent and stabilizing agent into the precursor solution, and continuously stirring for 90min to obtain the final product.
Comparative example 4
The latex plugging agent for the drilling fluid of the comparative example is prepared from the following raw materials in parts by weight: 100kg of latex, 10kg of esters, 5kg of acrylic acid, 6kg of sodium polystyrene sulfonate, 2kg of nano filler, 1kg of tetramethyl ammonium fluoride, 1kg of dispersing agent, 5kg of stabilizer and 35kg of solvent; the stabilizer consists of triethanolamine salt of dodecylbenzene sulfonate and hydroxyethyl urea according to the mol ratio of 5:1.75.
Wherein the latex is styrene-acrylic latex. The esters are methyl acrylate. The nano filler is nano calcium carbonate. The dispersing agent is butyl acetate.
The preparation method of the latex plugging for drilling fluid of this comparative example is the same as that of example 1.
Comparative example 5
The latex plugging agent for the drilling fluid of the comparative example is prepared from the following raw materials in parts by weight: 100kg of latex, 10kg of esters, 5kg of acrylic acid, 6kg of sodium polystyrene sulfonate, 2kg of nano filler, 1kg of tetramethyl ammonium fluoride, 1kg of dispersing agent, 5kg of stabilizer and 35kg of solvent; the stabilizer is OP-10.
Wherein the latex is styrene-acrylic latex. The esters are methyl acrylate. The nano filler is nano calcium carbonate. The dispersing agent is butyl acetate.
The preparation method of the latex plugging for drilling fluid of this comparative example is the same as that of example 1.
Comparative example 6
The latex plugging for drilling fluids of this comparative example differs from example 5 in that: the raw materials of the triethanolamine salt of alkylbenzene sulfonate comprise triethanolamine salt of dodecylbenzene sulfonate and triethanolamine salt of hexadecyl benzene sulfonate according to the mol ratio of 5:9, and the rest is the same as in example 5.
The preparation method of the latex plugging for drilling fluid of this comparative example is the same as that of example 5.
Performance test
1) The physical and chemical properties of the drilling fluids of examples 1 to 13 were measured with latex plugging agents, and the measurement results are shown in Table 1.
A. Appearance of
An appropriate amount of sample was placed in a clean dry 50mL cuvette, visually examined for color and status on a white background, and recorded.
B. determination of the pH value
Samples were dropped onto pH paper with a glass rod, read against standard color scale, and recorded.
C. determination of Density
The density was determined according to GB/T6750.
D. Electrolyte stability
50.00G of NaCl and 200mL of deionized water were added to the beaker, and the mixture was dissolved by stirring with a glass rod, and then 5.00g of NSEAL g of sample was added, and the mixture was stirred uniformly, and then placed in a test tube, and allowed to stand at 90℃for 2 hours, whereby the electrolyte stability was observed.
E. Sand bed plugging test
400Ml of deionized water is measured, 16g of sodium chloride is added, the mixture is stirred at a high speed for 20min, 16g of bentonite for test is added, the mixture is stirred at a high speed for 20min, and the mixture is placed still for 24h to obtain base slurry.
And (3) weighing 400ml of base slurry, adding 8ml of the latex plugging agent for the drilling fluid, stirring at a high speed for 20min, and measuring the plugging transmission quantity of the sand bed on an FA sand bed plugging instrument.
TABLE 1 physical and chemical Property index test data of latex blocking agent for drilling fluids of examples 1-13
2) Preparing drilling fluid according to GB/T5005-2010 standard, respectively adding the latex plugging agents for the drilling fluid of examples 1-13 and comparative examples 1-6, and then testing plugging performance according to GB/T16783.1-2014, wherein AV is apparent viscosity; the FL is the leakage of the plugging device at 60min/3000psi and the test results are shown in Table 2.
TABLE 2 data on the test of the blocking properties of the latex blocking agents for drilling fluids of examples 1 to 13 and comparative examples 1 to 6
| Sequence number | AV(mpa·s) | FL(ml) |
| Example 1 | 5.2 | 46 |
| Example 2 | 5.5 | 60 |
| Example 3 | 5.0 | 41 |
| Example 4 | 5.1 | 45 |
| Example 5 | 4.6 | 32 |
| Example 6 | 4.8 | 38 |
| Example 7 | 4.3 | 32 |
| Example 8 | 4.0 | 29 |
| Example 9 | 4.0 | 25 |
| Example 10 | 3.2 | 17 |
| Example 11 | 3.5 | 20 |
| Example 12 | 2.9 | 13 |
| Example 13 | 2.5 | 10 |
| Comparative example 1 | 9.5 | 106 |
| Comparative example 2 | 7.7 | 85 |
| Comparative example 3 | 6.5 | 62 |
| Comparative example 4 | 7.0 | 73 |
| Comparative example 5 | 8.1 | 93 |
| Comparative example 6 | 4.5 | 30 |
As can be seen from an analysis of examples 1-3, examples 4-5 and comparative examples 1-5 in combination with table 1, optimizing and adjusting the composition of the latex plugging agent, the addition of the stabilizer effectively improves the rheological properties and plugging properties of the drilling fluid-plugging agent mixture, and it can be seen that the apparent viscosity of example 3 is reduced by about 47% as compared to comparative example 1 without the addition of the stabilizer. Moreover, the leakage of the plugging instrument under the condition of 60min/3000psi is only 41ml, and the plugging state is very good. In addition, it can be seen from analysis of examples 4 to 5 and comparative examples 2 to 4 that when triethanolamine salt of alkylbenzene sulfonate is used alone, the distribution in the latex film-forming system may be uneven due to steric hindrance, resulting in a decrease in rheological property of the film-forming system, while when hydroxyethyl urea and hexamethyldisiloxane are added, the winding and grafting of triethanolamine salt of alkylbenzene sulfonate in the film-forming system are effectively promoted, and rheological property and interface bonding state of the latex film-forming system are improved, and it can be seen that the apparent viscosity of example 5 is decreased by about 40% compared to comparative example 2. Moreover, the apparent viscosity of example 5 was reduced by about 43% compared to conventional stabilizer OP-10.
As can be seen from an analysis of examples 6-8, comparative example 6 in combination with Table 1, further optimization and adjustment of the triethanolamine salt of alkylbenzene sulfonate improved the rheology and blocking performance of the latex film forming system, and the apparent viscosity of example 8 was reduced by about 12.5% as compared to comparative example 6.
As can be seen from the analysis of examples 9, 10-11 and 12-13 and the combination of Table 1, the composition ratio of the nanofiller is optimized, and urea and dimethyl sulfoxide are added into the solvent to promote the uniform compatibility of each component of the film forming system, so that the film forming system has better matching performance with the well wall stratum fracture. And after the polyquaternary ammonium salt is added, long-chain winding and association are promoted in the film forming system, so that the hydrodynamic volume in the film forming system is increased, and compared with example 8, the apparent viscosity of example 13 is reduced by about 37.5, the leakage of the plugging instrument under the condition of 60min/3000psi is reduced by about 65.5%, and the plugging performance and rheological property are better, so that the plugging agent is very suitable for being compounded with drilling fluids of various complex stratum.
The present embodiment is merely illustrative of the present application and should not be construed as limiting the application, and modifications that may be made in the present embodiment without creative contribution by those skilled in the art after reading the present specification are included within the scope of the patent claims.
Claims (6)
1. The latex plugging agent for the drilling fluid is characterized by being mainly prepared from the following raw materials in parts by weight: 80-100 parts of latex, 10-15 parts of esters, 5-12 parts of acrylic acid, 3-6 parts of sodium polystyrene sulfonate, 2-5 parts of nanofiller, 1-2 parts of tetramethyl ammonium fluoride, 0.5-1 part of dispersing agent, 5-10 parts of stabilizer and 20-35 parts of solvent; the esters are one of vinyl acetate, methyl acrylate and isooctyl methacrylate; the stabilizer consists of triethanolamine salt of alkylbenzene sulfonate, hydroxyethyl urea and hexamethyldisiloxane in the molar ratio of (5-8) (1.2-1.75) (3-5);
the latex is any one of styrene-acrylic latex, carboxylated nitrile latex and ethylene-propylene-diene monomer latex;
The nano filler is at least one of nano calcium carbonate, nano barium sulfate, nano calcium sulfate, nano silicon dioxide and nano zinc oxide;
The raw materials also comprise 1.5-2 parts by weight of polyquaternium.
2. The latex plugging agent for drilling fluids according to claim 1, wherein said triethanolamine salt of alkylbenzene sulfonate is at least one of triethanolamine salt of dodecylbenzene sulfonate and triethanolamine salt of hexadecylbenzene sulfonate.
3. The latex plugging agent for drilling fluids according to claim 2, wherein said triethanolamine salt of alkylbenzene sulfonate is composed of triethanolamine salt of dodecylbenzene sulfonate and triethanolamine salt of hexadecylbenzene sulfonate in a molar ratio of (7-15): 3-8.
4. The latex plugging agent for drilling fluids according to claim 1, wherein the mass ratio of the latex to the stabilizer is (8-10): 1.
5. The latex plugging agent for drilling fluid according to claim 1, wherein the solvent comprises water, urea and dimethyl sulfoxide in a mass ratio of (10-15): (0.2-0.5): (0.8-1.5).
6. A method of preparing a latex plugging agent for drilling fluids according to any one of claims 1-5, comprising the steps of:
s1: uniformly mixing latex, esters, acrylic acid, tetrabutylammonium fluoride and a solvent according to the formula amount to prepare a precursor solution;
s2: uniformly mixing the precursor liquid, sodium polystyrene sulfonate, nano filler, dispersing agent and stabilizing agent to obtain the nano-composite material;
the step S2 further comprises the step of adding polyquaternium.
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