CN117070201A - Shale inhibitor and preparation method and application thereof - Google Patents
Shale inhibitor and preparation method and application thereof Download PDFInfo
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- CN117070201A CN117070201A CN202311057006.8A CN202311057006A CN117070201A CN 117070201 A CN117070201 A CN 117070201A CN 202311057006 A CN202311057006 A CN 202311057006A CN 117070201 A CN117070201 A CN 117070201A
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- amino acid
- shale inhibitor
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- hydrotalcite
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- 239000003112 inhibitor Substances 0.000 title claims abstract description 100
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- -1 amino acid modified hydrotalcite Chemical class 0.000 claims abstract description 71
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 30
- 150000001412 amines Chemical class 0.000 claims abstract description 30
- 229920000570 polyether Polymers 0.000 claims abstract description 30
- GDVKFRBCXAPAQJ-UHFFFAOYSA-A dialuminum;hexamagnesium;carbonate;hexadecahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Al+3].[Al+3].[O-]C([O-])=O GDVKFRBCXAPAQJ-UHFFFAOYSA-A 0.000 claims abstract description 29
- 238000005553 drilling Methods 0.000 claims abstract description 27
- 229910001701 hydrotalcite Inorganic materials 0.000 claims abstract description 27
- 229960001545 hydrotalcite Drugs 0.000 claims abstract description 27
- 238000005342 ion exchange Methods 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 239000012530 fluid Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 11
- 239000011259 mixed solution Substances 0.000 claims description 9
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 claims description 6
- PXEDJBXQKAGXNJ-QTNFYWBSSA-L disodium L-glutamate Chemical compound [Na+].[Na+].[O-]C(=O)[C@@H](N)CCC([O-])=O PXEDJBXQKAGXNJ-QTNFYWBSSA-L 0.000 claims description 6
- 239000003960 organic solvent Substances 0.000 claims description 6
- CLUHWBURHNNGPK-UHFFFAOYSA-M sodium;6-aminohexanoate Chemical compound [Na+].NCCCCCC([O-])=O CLUHWBURHNNGPK-UHFFFAOYSA-M 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 4
- 230000005764 inhibitory process Effects 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 9
- 239000000654 additive Substances 0.000 abstract description 8
- 230000000996 additive effect Effects 0.000 abstract description 8
- 230000000052 comparative effect Effects 0.000 description 15
- 238000012360 testing method Methods 0.000 description 9
- 239000007864 aqueous solution Substances 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- WSLDOOZREJYCGB-UHFFFAOYSA-N 1,2-Dichloroethane Chemical compound ClCCCl WSLDOOZREJYCGB-UHFFFAOYSA-N 0.000 description 4
- 239000012153 distilled water Substances 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 238000001291 vacuum drying Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000440 bentonite Substances 0.000 description 2
- 229910000278 bentonite Inorganic materials 0.000 description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000012085 test solution Substances 0.000 description 2
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- LRQKBLKVPFOOQJ-UHFFFAOYSA-N 2-aminohexanoic acid Chemical compound CCCCC(N)C(O)=O LRQKBLKVPFOOQJ-UHFFFAOYSA-N 0.000 description 1
- SLXKOJJOQWFEFD-UHFFFAOYSA-N 6-aminohexanoic acid Chemical compound NCCCCCC(O)=O SLXKOJJOQWFEFD-UHFFFAOYSA-N 0.000 description 1
- 229910001051 Magnalium Inorganic materials 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- GANNOFFDYMSBSZ-UHFFFAOYSA-N [AlH3].[Mg] Chemical class [AlH3].[Mg] GANNOFFDYMSBSZ-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- UJOHNXQDVUADCG-UHFFFAOYSA-L aluminum;magnesium;carbonate Chemical compound [Mg+2].[Al+3].[O-]C([O-])=O UJOHNXQDVUADCG-UHFFFAOYSA-L 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 229940113721 aminocaproate Drugs 0.000 description 1
- 229960002684 aminocaproic acid Drugs 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/22—Synthetic organic compounds
- C09K8/24—Polymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/16—Clay-containing compositions characterised by the inorganic compounds other than clay
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/12—Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The application relates to a shale inhibitor, a preparation method and application thereof, and relates to the technical field of oilfield chemistry, wherein the shale inhibitor comprises the following components: polyetheramine and amino acid modified hydrotalcite; the amino acid modified hydrotalcite is obtained by carrying out ion exchange reaction on hydrotalcite and amino acid salt; the weight ratio of the polyether amine to the amino acid modified hydrotalcite is 1 (0.05-0.10). According to the application, the amino acid modified hydrotalcite is used as the additive of the polyether amine shale inhibitor for the first time, and the two are matched for use, so that the high temperature resistance of the existing polyether amine shale inhibitor is remarkably improved, the inhibition effect is further improved, and the application scene of the polyether amine shale inhibitor in oil and gas drilling is widened.
Description
Technical Field
The application relates to the technical field of oilfield chemistry, in particular to a shale inhibitor and a preparation method and application thereof.
Background
Shale is one of the most common rock in oil fields that must be drilled through to reach the reservoir, which is a fine impermeable sedimentary rock composed mainly of clay and other minerals. When the water-based drilling fluid is used in the drilling process of shale stratum, the shale is inevitably hydrated and expanded, so that the accidents of shrinkage of the drilling hole, sticking of the drilling hole, unstable well wall, collapse and the like are caused. Thus, the well wall stability problem has greatly limited the wide range of applications for water-based drilling fluids.
The water-based drilling fluid mainly comprises shale inhibitor, filtrate reducer, tackifier and the like; among them, shale inhibitors are key treatments for guaranteeing the stability of the walls of the shale, and their research is also receiving increasing attention from drilling fluid workers. The existing oil field uses a plurality of inhibitors, and the performance of each type is different. At present, the shale inhibitor widely used is amine shale inhibitor such as polyetheramine, which has the characteristics of low toxicity, good compatibility and the like, but has the problems of poor high temperature resistance and further improved inhibition effect.
Disclosure of Invention
The application provides a shale inhibitor and a preparation method and application thereof, which are used for solving the technical problems of poor high temperature resistance and the like of the existing polyether amine shale inhibitor; meanwhile, the inhibition effect is further improved, so that the application scene of the oil-gas well drilling agent in oil-gas well drilling is widened.
In a first aspect, the present application provides a shale inhibitor comprising the following components: polyetheramine and amino acid modified hydrotalcite;
the amino acid modified hydrotalcite is obtained by carrying out ion exchange reaction on hydrotalcite and amino acid salt;
the weight ratio of the polyether amine to the amino acid modified hydrotalcite is 1 (0.05-0.10).
Further, the weight ratio of the polyetheramine to the amino acid modified hydrotalcite is 1:0.08.
Further, the particle size of the amino acid modified hydrotalcite is 400-500 meshes.
Further, the amino acid salt includes at least one of sodium 6-aminocaproate and disodium glutamate.
Further, the hydrotalcite includes magnesium aluminum hydrotalcite.
Further, the polyetheramine has an average relative molecular weight of < 1000.
Further, the product model of the polyetheramine comprises at least one of D230, D400, and T403.
In a second aspect, the present application provides a method of preparing a shale inhibitor as claimed in any of the first aspects, the method comprising the steps of:
obtaining amino acid modified hydrotalcite;
adding the polyether amine into an organic solvent for first stirring to obtain a mixed solution;
and adding the amino acid modified hydrotalcite into the mixed solution for second stirring, concentrating and drying to obtain the shale inhibitor.
In a third aspect, the present application provides a shale inhibitor as defined in any of the first aspects and/or a shale inhibitor as defined in any of the second aspects for use in oil and gas drilling.
In a fourth aspect, the present application provides a water-based drilling fluid containing a shale inhibitor according to any of the first aspects.
Compared with the prior art, the technical scheme provided by the embodiment of the application has at least the following advantages:
the embodiment of the application provides a shale inhibitor, which adopts amino acid modified hydrotalcite as an additive of a polyether amine shale inhibitor for the first time, and the two are matched for use, so that the high temperature resistance of the conventional polyether amine shale inhibitor is remarkably improved, the inhibition effect is further improved, and the application scene of the shale inhibitor in oil and gas drilling is widened.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic flow chart of a preparation method of a shale inhibitor according to an embodiment of the application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Unless otherwise specifically indicated, the various raw materials, reagents, instruments, equipment and the like used in the present application are commercially available or may be prepared by existing methods.
In a first aspect, the present application provides a shale inhibitor comprising the following components: polyetheramine and amino acid modified hydrotalcite;
the amino acid modified hydrotalcite is obtained by carrying out ion exchange reaction on hydrotalcite and amino acid salt;
the weight ratio of the polyether amine to the amino acid modified hydrotalcite is 1 (0.05-0.10).
Polyetheramines (PEA) are a class of polymers with a polyether structure in the backbone and amine groups in the terminal reactive functional groups, commercial polyetheramines include monofunctional, difunctional, trifunctional, and a range of products with molecular weights ranging from 230 to 5000, such as D230, D400, and T403. Polyetheramine belongs to an oligoamine shale inhibitor, and can effectively inhibit hydration of clay minerals by utilizing the chemical structure of the polyetheramine, and is often used as a shale inhibitor in drilling fluid.
Hydrotalcite is a layered double hydroxide (Layered Double Hydroxide, LDH for short), and specifically comprises, for example, magnesium aluminum carbonate type hydrotalcite (Mg 6 Al 2 (OH) 16 CO 3 ·4H 2 O), and the like. Because hydrotalcite has a special layered structure, the hydrotalcite is widely appliedIn the fields of flame retardance, catalysis, adsorption and the like, along with the wide application of modern analysis technology and testing means, the research on hydrotalcite structure and application is deepened continuously, but no report on the application of hydrotalcite in shale inhibitors exists at present.
The embodiment of the application provides a shale inhibitor, which adopts amino acid modified hydrotalcite as an additive of a polyether amine shale inhibitor for the first time, and the two are matched for use, so that the high temperature resistance of the conventional polyether amine shale inhibitor is remarkably improved, the inhibition effect is further improved, and the application scene of the shale inhibitor in oil and gas drilling is widened.
In the application, the amino acid modified hydrotalcite is obtained by carrying out ion exchange reaction on hydrotalcite and amino acid salt. In some embodiments, the amino acid modified hydrotalcite may be prepared by the following method: at 80-95 deg.c, hydrotalcite is heated and stirred in proper amount of water for 1-3 hr, amino acid salt is then added for further stirring, ion exchange is performed for 10-24 hr, filtering is performed, and finally water washing and vacuum drying are performed successively to obtain solid (i.e. amino acid modified hydrotalcite).
The inventor discovers through further research that when the weight ratio of the polyether amine to the amino acid modified hydrotalcite is controlled to be 1 (0.05-0.10), the synergistic compatibility of the polyether amine and the amino acid modified hydrotalcite is better, and the comprehensive performance of the obtained shale inhibitor is better. If the dosage of the additive amino acid modified hydrotalcite is too small, the improvement effect of the polyether amine shale inhibitor is not obvious; if the dosage of the additive amino acid modified hydrotalcite is too large, the inhibiting effect of the polyether amine shale inhibitor is reduced to a certain extent.
In some embodiments, the weight ratio of the polyetheramine to the amino acid modified hydrotalcite may be 1:0.05, 1:0.06, 1:0.07, 1:0.08, 1:0.09, 1:0.10, etc.; preferably, the weight ratio of the polyetheramine to the amino acid modified hydrotalcite is 1:0.08.
As an embodiment of the present application, the particle size of the amino acid-modified hydrotalcite is 400 to 500 mesh.
The inventor discovers through further research that when the grain diameter of the amino acid modified hydrotalcite is controlled to be 400-500 meshes, the temperature resistance of the polyether amine shale inhibitor is more improved.
In some embodiments, the amino acid modified hydrotalcite obtained by carrying out ion exchange reaction on hydrotalcite and amino acid salt can be crushed and then sieved, so that the amino acid modified hydrotalcite with corresponding particle size can be obtained.
As an embodiment of the present embodiment, the amino acid salt includes at least one of sodium 6-aminocaproate and disodium glutamate, and the hydrotalcite includes magnesium aluminum hydrotalcite.
In some embodiments, the amino acid salts of the present application may be commercially available, such as sodium 6-aminocaproate and disodium glutamate, and the hydrotalcite may be commercially available, such as magnalium hydrotalcite (CAS No. 11097-59-9); preferably, disodium glutamate and magnesium aluminum hydrotalcite are selected for matching use, and the amino acid modified hydrotalcite is obtained after ion exchange. Of course, the amino acid salt and the hydrotalcite of the present application can be prepared by a method disclosed in the prior art, and the preparation methods of the amino acid salt and the hydrotalcite are not described in detail in the present document.
As an embodiment of the examples according to the application, the polyetheramines have an average relative molecular weight of < 1000.
Preferably, the average relative molecular weight of the polyetheramines of the present application is less than 1000, and commercially available products such as D230, D400 and T403 can be selected; t403 is preferred.
The components of the shale inhibitor provided by the embodiment of the application can be directly commercially available products such as polyetheramine and hydrotalcite if the components are not limited or described.
In a second aspect, based on one general inventive concept, the present application provides a method for preparing the shale inhibitor according to any one of the first aspect, as shown in fig. 1, the method comprising the steps of:
obtaining amino acid modified hydrotalcite;
adding the polyether amine into an organic solvent for first stirring to obtain a mixed solution;
and adding the amino acid modified hydrotalcite into the mixed solution for second stirring, concentrating and drying to obtain the shale inhibitor.
The preparation method of the shale inhibitor provided by the application is simple to operate, does not need extra specific equipment, and is suitable for industrial production. Meanwhile, the preparation method of the shale inhibitor is realized based on any one of the shale inhibitors in the first aspect, so that the shale inhibitor at least has all the beneficial effects brought by the technical scheme in the embodiment, and the detailed description is omitted.
In some embodiments, the organic solvent is preferably a neutral organic solvent such as methylene chloride, carbon tetrachloride, 1, 2-dichloroethane, or the like; preferably 1, 2-dichloroethane; the amount of the organic solvent may be such that the polyether amine and the amino acid modified hydrotalcite form a mixed solution, for example, may be 3 to 100 times the total weight of the polyether amine and the amino acid modified hydrotalcite.
In some embodiments, the first stirring and the second stirring may be performed by conventional mechanical stirring, so that the polyetheramine and the amino acid modified hydrotalcite can be thoroughly mixed.
It should be noted that, the operation steps involved in the preparation method provided by the application can be performed in a conventional manner in the art unless otherwise specified or limited, for example, the first stirring, the second stirring, the concentration drying and the like can be performed in a conventional manner in the art.
In a third aspect, the present application provides a shale inhibitor as defined in any of the first aspects and/or a shale inhibitor as defined in any of the second aspects for use in oil and gas drilling.
The shale inhibitor provided by the application has excellent temperature resistance and inhibition effect, not only effectively solves the problem of well wall stability, but also further widens the application scene of the shale inhibitor in oil and gas drilling, and meets the stricter use requirement in the actual drilling process.
In a fourth aspect, the present application provides a water-based drilling fluid containing a shale inhibitor according to any of the first aspects.
The water-based drilling fluid provided by the application is realized based on the shale inhibitor according to any one of the first aspect, so that the water-based drilling fluid at least has all the beneficial effects brought by the technical scheme of the embodiment, and the description is omitted herein.
In some embodiments, the water-based drilling fluid may further comprise other components such as a fluid loss additive and a tackifier according to the prior art, which are not described in detail herein.
In some embodiments, the shale inhibitor may be present in the aqueous drilling fluid in an amount of 0.1 to 3.0wt%, preferably 1wt%, by weight.
The application will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present application and are not intended to limit the scope of the present application. The experimental procedures, which are not specified in the following examples, are generally determined according to national standards. If the corresponding national standard does not exist, the method is carried out according to the general international standard, the conventional condition or the condition recommended by the manufacturer.
Example 1
The example provides a shale inhibitor, which comprises polyetheramine and amino acid modified hydrotalcite in a weight ratio of 1:0.05, and the preparation method comprises the following steps:
uniformly mixing 1.31g of 6-aminocaproic acid and 10mL of sodium hydroxide with the concentration of 1.0mol/L to prepare a sodium 6-aminocaproate solution, adding 0.8L of distilled water and 97g of magnesium aluminum hydrotalcite into a 1L stainless steel reaction kettle, heating to 80 ℃ and strongly stirring for 2 hours, adding the sodium 6-aminocaproate solution, stirring for 12 hours at 90 ℃, washing the filtered product with distilled water for multiple times, vacuum drying the obtained solid to constant weight, crushing and grinding, and sieving with a 400-500-mesh sieve to obtain amino acid modified hydrotalcite;
adding 10g of polyetheramine D230 into 50ml of 1, 2-dichloroethane, and carrying out first stirring for 10 minutes to obtain a mixed solution;
adding 0.5g of the prepared amino acid modified hydrotalcite into the mixed solution, carrying out second stirring for 1 hour, then carrying out reduced pressure concentration to remove 1, 2-dichloroethane, and finally carrying out vacuum drying on the obtained solid to obtain the shale inhibitor.
Example 2
This example provides a shale inhibitor which differs from example 1 only in that: the weight ratio of the polyetheramine to the amino acid modified hydrotalcite is 1:0.10, and the polyetheramine is D400; specifically, in the preparation process of the shale inhibitor, the dosage of amino acid modified hydrotalcite is adjusted to be 1.0g, and polyetheramine D230 is adjusted to be D400; the rest steps and parameters are the same.
Example 3
This example provides a shale inhibitor which differs from example 1 only in that: the weight ratio of the polyetheramine to the amino acid modified hydrotalcite is 1:0.08; specifically, in the preparation process of the shale inhibitor, the dosage of the amino acid modified hydrotalcite is adjusted to be 0.8g; the rest steps and parameters are the same.
Example 4
This example provides a shale inhibitor which differs from example 3 only in that: the polyetheramine is T403; specifically, during the preparation of the shale inhibitor, polyetheramine D230 is adjusted to T403; the rest steps and parameters are the same.
Example 5
This example provides a shale inhibitor which differs from example 4 only in that: the amino acid modified hydrotalcite is obtained by carrying out ion exchange on disodium glutamate and magnesium aluminum hydrotalcite; the rest steps and parameters are the same.
Example 6
This example provides a shale inhibitor which differs from example 4 only in that: the particle size of the amino acid modified hydrotalcite is 100-200 meshes, and the polyether amine is D2000; the rest steps and parameters are the same.
Comparative example 1
This example provides a shale inhibitor which differs from example 1 only in that: adjusting the amino acid modified hydrotalcite into unmodified magnesium aluminum hydrotalcite; the rest steps and parameters are the same.
Comparative example 2
This example provides a shale inhibitor which differs from example 1 only in that: adjusting the amino acid modified hydrotalcite into 6-sodium aminocaproate solid; the rest steps and parameters are the same.
Comparative example 3
This example provides a shale inhibitor which is polyetheramine D230 (i.e., no amino acid modified hydrotalcite added).
Comparative example 4
This example provides a shale inhibitor which differs from example 1 only in that: the weight ratio of the polyetheramine to the amino acid modified hydrotalcite is 1:0.15; specifically, in the preparation process of the shale inhibitor, the dosage of the amino acid modified hydrotalcite is adjusted to be 1.5g; the rest steps and parameters are the same.
Test case
The shale inhibitors provided in examples 1-6 and comparative examples 1-4 were tested for performance.
1) High temperature resistance test: the shale inhibitors provided in examples 1 to 6 and comparative examples 1 to 4 were formulated into aqueous solutions with a weight fraction of 1wt% as samples with distilled water, and an appropriate amount of anhydrous sodium carbonate was added thereto with stirring at a stirring rate of 100r/min, 10wt% bentonite was added thereto with stirring for 20 minutes, aged at 200 ℃ for 16 hours, and then after the samples were cooled to room temperature, rheological parameters thereof were tested and recorded.
Calculating the relative inhibition rate: relative inhibition (%) = (X) 0 -X)/X 0 X 100%; wherein X is 0 For the base stock at 100r/min, X is the sample at 100 r/min.
The test results are shown in Table 1.
Table 1 Performance of shale inhibitors after aging for 16 hours at 200℃
| Numbering device | Relative inhibition Rate (%) |
| Example 1 | 89.1 |
| Example 2 | 88.4 |
| Example 3 | 92.6 |
| Example 4 | 96.8 |
| Example 5 | 97.5 |
| Example 6 | 88.7 |
| Comparative example 1 | 81.4 |
| Comparative example 2 | 82.0 |
| Comparative example 3 | 80.9 |
| Comparative example 4 | 75.3 |
As can be seen from Table 1, the shale inhibitor provided by the embodiment of the application has a relative inhibition rate of 88.4-97.5% after being aged for 16 hours at a high temperature of 200 ℃, which is significantly better than that of comparative examples 1-4. Compared with the polyether amine shale inhibitor without the amino acid modified hydrotalcite (comparative example 3), the shale inhibitor provided by the embodiment of the application has the advantages that the relative inhibition rate is improved by 9.3% -20.5%, and the high temperature resistance of the conventional polyether amine shale inhibitor is remarkably improved.
2) Shale expansion rate test: preparing aqueous solution with the weight fraction of 1wt% of shale inhibitor provided in examples 1-6 and comparative example 3 (namely polyether amine D230 shale inhibitor) into shale inhibitor test solution by using distilled water, and measuring 20mL of shale inhibitor test solution for standby in a beaker; weighing 5g of bentonite for drilling fluid dried at 105 ℃, loading into a testing cylinder, inserting a plug rod into the testing cylinder, maintaining at 1MPa for five minutes to obtain an experimental core, and measuring the initial height H of a rock sample 1 . Installing a measuring cylinder with a core on a shale expander, injecting a liquid to be tested into the measuring cylinder, soaking for 24 hours, and recording the expansion amount H of the core 2 。
Shale expansion rate calculation: shale expansion ratio (%) = (H) 2 -H 1 )/H 1 ×100％。
The test results are shown in Table 2.
TABLE 2
| Numbering device | Shale expansion rate (%) |
| Example 1 | 26.3 |
| Example 2 | 27.2 |
| Example 3 | 23.7 |
| Example 4 | 18.5 |
| Example 5 | 17.9 |
| Example 6 | 27.6 |
| Comparative example 3 | 34.2 |
As can be seen from table 2, the shale inhibitor provided in the examples of the present application has a better inhibition effect than the polyether amine shale inhibitor (comparative example 3) without the amino acid modified hydrotalcite. Meanwhile, the influence of the concentration of the shale inhibitor provided by the application on the inhibition performance is further examined, and the result shows that: the shale inhibitor provided in example 4 was formulated as an aqueous solution with a weight fraction of 0.6wt% for shale expansion rate testing, which reduced the shale expansion rate by 8.6% (as compared to 1.0wt% aqueous solution); the shale inhibition agent provided in example 4, when formulated as a 1.5wt% aqueous solution, maintains its shale expansion ratio substantially unchanged.
In summary, the embodiment of the application provides a shale inhibitor, which adopts amino acid modified hydrotalcite as an additive of a polyether amine shale inhibitor for the first time, and the shale inhibitor and the additive are matched for use, so that the high temperature resistance of the conventional polyether amine shale inhibitor is remarkably improved, the inhibition effect is further improved, and the application scene of the shale inhibitor in oil and gas drilling is widened.
Various embodiments of the application may exist in a range of forms; it should be understood that the description in a range format is merely for convenience and brevity and should not be construed as a rigid limitation on the scope of the application; it is therefore to be understood that the range description has specifically disclosed all possible sub-ranges and individual values within that range. For example, it should be considered that a description of a range from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1,2, 3, 4, 5, and 6, wherever applicable. In addition, whenever a numerical range is referred to herein, it is meant to include any reference number (fractional or integer) within the indicated range.
In the description of the present specification, the terms "include," "comprising," and the like are intended to mean "include, but are not limited to. Relational terms such as "first" and "second", and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Herein, "and/or" describing an association relationship of an association object means that there may be three relationships, for example, a and/or B, may mean: a alone, a and B together, and B alone. Wherein A, B may be singular or plural. Herein, "at least one" means one or more, and "a plurality" means two or more. "at least one", "at least one" or the like refer to any combination of these items, including any combination of single item(s) or plural items(s). For example, "at least one (individual) of a, b, or c," or "at least one (individual) of a, b, and c," may each represent: a, b, c, a-b (i.e., a and b), a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple, respectively.
The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A shale inhibitor, characterized in that the shale inhibitor comprises the following components: polyetheramine and amino acid modified hydrotalcite;
the amino acid modified hydrotalcite is obtained by carrying out ion exchange reaction on hydrotalcite and amino acid salt;
the weight ratio of the polyether amine to the amino acid modified hydrotalcite is 1 (0.05-0.10).
2. Shale inhibitor according to claim 1, characterized in that the weight ratio of polyetheramine to amino acid modified hydrotalcite is 1:0.08.
3. The shale inhibitor according to claim 1, wherein the amino acid modified hydrotalcite has a particle size of 400-500 mesh.
4. The shale inhibitor as claimed in claim 1, wherein the amino acid salt comprises at least one of sodium 6-aminocaproate and disodium glutamate.
5. The shale inhibitor of claim 1, wherein the hydrotalcite comprises magnesium aluminum hydrotalcite.
6. The shale inhibitor according to claim 1, wherein the polyetheramine has an average relative molecular weight < 1000.
7. The shale inhibitor of claim 6, wherein the polyetheramine product model comprises at least one of D230, D400, and T403.
8. A method of preparing a shale inhibitor as claimed in any of claims 1 to 7, comprising the steps of:
obtaining amino acid modified hydrotalcite;
adding the polyether amine into an organic solvent for first stirring to obtain a mixed solution;
and adding the amino acid modified hydrotalcite into the mixed solution for second stirring, concentrating and drying to obtain the shale inhibitor.
9. Use of the shale inhibitor as claimed in any of claims 1 to 7 and/or the shale inhibitor as prepared by the preparation method as claimed in the claims in oil and gas drilling.
10. A water-based drilling fluid, characterized in that it contains a shale inhibitor according to any of claims 1-7.
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