CN112175599A - Alkali-resistant coating sand and preparation method and application thereof - Google Patents
Alkali-resistant coating sand and preparation method and application thereof Download PDFInfo
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- CN112175599A CN112175599A CN202011189872.9A CN202011189872A CN112175599A CN 112175599 A CN112175599 A CN 112175599A CN 202011189872 A CN202011189872 A CN 202011189872A CN 112175599 A CN112175599 A CN 112175599A
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- sand
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- 239000004576 sand Substances 0.000 title claims abstract description 100
- 239000003513 alkali Substances 0.000 title claims abstract description 50
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000011248 coating agent Substances 0.000 title abstract description 24
- 238000000576 coating method Methods 0.000 title abstract description 24
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 125
- 239000003822 epoxy resin Substances 0.000 claims abstract description 46
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 46
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 39
- 239000006004 Quartz sand Substances 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000005056 polyisocyanate Substances 0.000 claims description 18
- 229920001228 polyisocyanate Polymers 0.000 claims description 18
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 15
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 13
- 229920005862 polyol Polymers 0.000 claims description 11
- 150000003077 polyols Chemical class 0.000 claims description 11
- 239000012530 fluid Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- 239000012188 paraffin wax Substances 0.000 claims description 7
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 239000003129 oil well Substances 0.000 claims description 5
- SVTBMSDMJJWYQN-UHFFFAOYSA-N 2-methylpentane-2,4-diol Chemical compound CC(O)CC(C)(C)O SVTBMSDMJJWYQN-UHFFFAOYSA-N 0.000 claims description 4
- PUPZLCDOIYMWBV-UHFFFAOYSA-N (+/-)-1,3-Butanediol Chemical compound CC(O)CCO PUPZLCDOIYMWBV-UHFFFAOYSA-N 0.000 claims description 2
- 229940051250 hexylene glycol Drugs 0.000 claims description 2
- 238000012986 modification Methods 0.000 claims description 2
- 230000004048 modification Effects 0.000 claims description 2
- 238000002715 modification method Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 16
- 238000002347 injection Methods 0.000 abstract description 13
- 239000007924 injection Substances 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 230000035699 permeability Effects 0.000 abstract description 9
- 230000002265 prevention Effects 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 5
- 230000003712 anti-aging effect Effects 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 238000009991 scouring Methods 0.000 abstract description 2
- 238000007711 solidification Methods 0.000 abstract 1
- 230000008023 solidification Effects 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 8
- 230000001965 increasing effect Effects 0.000 description 7
- 239000007788 liquid Substances 0.000 description 7
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- 238000007596 consolidation process Methods 0.000 description 3
- ACCCMOQWYVYDOT-UHFFFAOYSA-N hexane-1,1-diol Chemical compound CCCCCC(O)O ACCCMOQWYVYDOT-UHFFFAOYSA-N 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 2
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 208000010392 Bone Fractures Diseases 0.000 description 2
- 206010017076 Fracture Diseases 0.000 description 2
- 235000009827 Prunus armeniaca Nutrition 0.000 description 2
- 244000018633 Prunus armeniaca Species 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 2
- 239000004850 liquid epoxy resins (LERs) Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000005011 phenolic resin Substances 0.000 description 2
- 229920001568 phenolic resin Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000011206 ternary composite Substances 0.000 description 2
- VILCJCGEZXAXTO-UHFFFAOYSA-N 2,2,2-tetramine Chemical compound NCCNCCNCCN VILCJCGEZXAXTO-UHFFFAOYSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 1
- 208000006670 Multiple fractures Diseases 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- -1 flooding Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 229960001124 trientine Drugs 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
- C09K8/56—Compositions for consolidating loose sand or the like around wells without excessively decreasing the permeability thereof
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Polyurethanes Or Polyureas (AREA)
- Epoxy Resins (AREA)
Abstract
The invention discloses alkali-resistant coated sand and a preparation method and application thereof, wherein the alkali-resistant coated sand comprises quartz sand or ceramsite sand for fracturing, epoxy resin and an oil-soluble curing agent; wherein the mass ratio of the quartz sand or the ceramsite sand to the epoxy resin to the oil-soluble curing agent is 100:3-8: 3-10. This alkali-resistant coating sand can solidify under the oil reservoir temperature, forms the artifical wall of a well that solidification intensity is high, and alkali-resistant effect is good, and keeps high permeability. And has excellent anti-aging and anti-scouring capabilities, and completely meets the sand prevention requirement of an oil layer. Only one-time construction is needed during field operation, the construction process is simple, the exploitation period of the alkali injection and flooding injection and production well is prolonged, and the economic benefit is improved.
Description
Technical Field
The invention relates to a technology for improving injection and production efficiency by compound flooding, in particular to alkali-resistant coated sand and a preparation method and application thereof
Background
The research of the ternary composite alkali flooding technology is started in 80 years of the 20 th century, and the alkali-surfactant-polymer composite oil flooding technology has the advantages of the surfactant and the polymer flooding, can enlarge the swept area and improve the oil flooding efficiency. With the further development of the alkali-flooding technology of the ternary composite in Daqing oil field, the problem of sand production of an oil layer is serious in the later period of exploitation, the pH value of the alkali-flooding is more than 13, the general temperature of the oil layer is 20-50 ℃, and higher requirements are put forward for a sand prevention process. The prior sand prevention process mainly comprises mechanical sand prevention and chemical sand prevention. Mechanical sand control is easily restricted by well and mine, the construction process is complex, and chemical sand control plays an important role with the unique advantages thereof. The chemical sand control mainly takes resin coated sand control as the main part, and the permeability can be kept unchanged after the chemical sand control is used, so that the sand control benefit is improved.
The patent CN 104592965A adopts A type particles and B type particles, wherein the A type particles are formed by sequentially coating a resin coating film and an external release agent outside a quartz sand or ceramsite sand/ceramsite matrix; the B type particles are formed by sequentially coating an epoxy resin curing agent coating film and an external isolating agent outside a quartz sand or ceramsite sand/ceramsite matrix, and the A type particles and the B type particles are mixed according to the weight ratio of 1:1 in field sand control operation and then used. The process needs to prepare two types of A/B particles respectively, and the A/B particles are mixed again in site sand prevention operation, so that the construction is complex, the strength is difficult to ensure, and the alkali resistance effect is uncertain.
Patent CN 101740882 a adopts liquid epoxy resin, solid epoxy resin and liquid phenolic resin to prepare a cementing agent for low-temperature alkali-resistant coated sand after mixing, uses triethylene tetramine, ethylenediamine, phenol, formaldehyde and acetone to form a water-soluble curing agent, uses the cementing agent and quartz sand or ceramsite sand to prepare low-temperature alkali-resistant coated sand, and then forms the coated sand with the water-soluble curing agent by secondary forming according to the volume ratio. The low-temperature oil reservoir sand discharging agent prepared by the method is added with liquid phenolic resin, so that the alkali resistance effect is poor; the high proportion (40-50%) of the liquid epoxy resin causes the disadvantages of short storage time of the coating sand and easy blocking, the low-temperature oil reservoir coating sand and the water-soluble curing agent are respectively added in the construction process, the construction is complex, and the permeability is reduced, even the oil well can not produce oil.
The existing coating sand generally has the problems of poor alkali-resistant effect, low consolidation strength at oil layer temperature (20-50 ℃), short storage time of the coating sand, easy blocking, complex construction process, secondary construction requirement under general conditions and reduced permeability after resin coating sand is applied.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to improve the alkali resistance of the coated sand, ensure the consolidation strength and improve the permeability after the coated sand is applied. The invention also aims to simplify the construction process of coating sand and reduce the construction cost.
The invention provides alkali-resistant coating sand in a first aspect, which comprises quartz sand or ceramsite sand, epoxy resin and an oil-soluble curing agent; wherein the mass ratio of the quartz sand or the ceramsite sand to the epoxy resin to the oil-soluble curing agent is 100:3-8: 3-10.
In the above technical solution, the quartz sand or the ceramsite sand may be any conventional quartz sand or ceramsite sand, and is preferably quartz sand or ceramsite sand 20/40. Quartz sand is adopted to improve the fracturing after-dressing effect and reduce the breaking rate by more than 3500 meters; below 3500 m, ceramsite sand is used.
In the above technical solution, the epoxy resin is preferably a modified epoxy resin, the modified epoxy resin is a paraffin-encapsulated epoxy resin, and the epoxy resin is preferably one or more of E51, E44, and E03. The thickness of the paraffin layer can be selected as desired.
In the technical scheme, the oil-soluble curing agent is an oil-soluble curing agent consisting of polyisocyanate and polyol. Polyisocyanate in mass ratio: the polyol is 60-80: 40-20, and the polyisocyanate is preferably: polyol 70: 30. The polyhydric alcohol is preferably one or more of ethylene glycol, propylene glycol, butylene glycol and hexylene glycol.
The second aspect of the invention provides a preparation method of alkali-resistant coated sand, which comprises the following steps: mixing quartz sand or ceramsite sand, epoxy resin and an oil-soluble curing agent according to the mass ratio of 100:3-8:3-10 of the quartz sand or ceramsite sand to the epoxy resin to the oil-soluble curing agent to obtain the alkali-resistant coated sand.
In the above technical solution, the epoxy resin is preferably a modified epoxy resin. The modification method comprises the following steps: heating the epoxy resin to 120-150 ℃, preferably 130 ℃, adding paraffin, preferably high-molecular paraffin with the molecular weight of 3000-5000, and keeping the constant time for 2-5 hours, preferably 3 hours to obtain the modified epoxy resin. The modified epoxy resin has a proper softening point and a certain toughness. The epoxy resin is preferably one or more of E51, E44, and E03.
In the technical scheme, the oil-soluble curing agent adopts polyisocyanate and polyol, and the reaction is carried out for 3-6 h, preferably 4h at the temperature of 70-85 ℃ for toughening modification. The specific proportion is polyisocyanate: the polyol is 60-80: 40-20, and the polyisocyanate is preferably: polyol 70: 30.
In the technical scheme, the mixing is to heat quartz sand or ceramsite sand to 130-140 ℃, add the modified epoxy resin, mix for 30-60 s, preferably 45s, add the oil-soluble curing agent, mix for 30-70 s, preferably 50s, and obtain the alkali-resistant coated sand.
A third aspect of the invention is to provide a use of alkali-resistant coated sand in an oil well.
After fracturing construction is completed, alkali-resistant coated sand is traced, the well wall is stabilized, the permeability of the shaft is improved, the fracturing propping agent is prevented from returning and spitting, the formation sand is prevented, and the oil well yield is improvedThe effect of (1). Carrying alkali-resistant coating sand by using fracturing sand-carrying liquid, preferably, the discharge capacity of the sand-carrying liquid is 2.0-4.0 m3Min, adding 3.0-4.0 m of each crack3. Pumping the displacement liquid, closing the well, initially setting for 200-300 min, and back injecting hot water at 70-90 ℃ for 20-30 m3The consolidation speed, the strength and the permeability of the alkali-resistant coated sand are improved.
The resin is formed by modified epoxy resin, the modified oil-soluble curing agent is coated on the surface of quartz sand or ceramsite sand at a high temperature to prepare alkali-resistant coated sand, and the alkali-resistant coated sand can be cured at the oil layer temperature (20-50 ℃) to form an artificial well wall with high curing strength, and the alkali-resistant coated sand has an excellent alkali-resistant effect and keeps high permeability. And has excellent anti-aging and anti-scouring capabilities, and completely meets the sand prevention requirement of an oil layer. Only one-time construction is needed during field operation, the construction process is simple, and the economic benefit is improved.
Detailed Description
The present invention will be described in detail with reference to specific examples. It should be understood that the detailed description is intended to be illustrative only and should not be taken as limiting the scope of the invention.
Example 1
Heating epoxy resin E51 to 130 ℃, adding high molecular paraffin, and keeping constant time for 3h to obtain the modified epoxy resin.
Taking polyisocyanate and glycol, wherein the mass ratio of the polyisocyanate to the glycol is polyisocyanate: and (3) reacting the mixture for 4 hours at the temperature of 75 ℃ with ethylene glycol of 70:30, and toughening and modifying the mixture to obtain the modified oil-soluble curing agent.
Heating quartz sand or ceramsite sand to 130 ℃, adding the modified epoxy resin, mixing for 45s, adding the modified oil-soluble curing agent, and mixing for 50s to obtain the alkali-resistant coating sand A, wherein the mass ratio of the quartz sand or ceramsite sand to the modified epoxy resin to the modified oil-soluble curing agent is 100:3: 5.
Example 2
Heating epoxy resin E44 to 150 ℃, adding high molecular paraffin (with the molecular weight of 3000-5000), and keeping the constant time for 4 hours to obtain the modified epoxy resin.
Taking polyisocyanate and hexanediol, wherein the mass ratio of the polyisocyanate to the hexanediol is as follows: and (3) reacting the hexanediol at the temperature of 85 ℃ for 6h, and toughening and modifying to obtain the modified oil-soluble curing agent.
Heating quartz sand or ceramsite sand to 150 ℃, adding the modified epoxy resin, mixing for 60s, adding the modified oil-soluble curing agent, and mixing for 60s to obtain the alkali-resistant coating sand B, wherein the mass ratio of the quartz sand or ceramsite sand to the modified epoxy resin to the modified oil-soluble curing agent is 100:8: 10.
Example 3
Heating epoxy resin E03 to 120 ℃, adding high molecular paraffin (with the molecular weight of 3000-5000), and keeping the constant time for 3 hours to obtain the modified epoxy resin.
Taking polyisocyanate and propylene glycol, wherein the mass ratio of the polyisocyanate to the propylene glycol is polyisocyanate: and (3) reacting the propylene glycol 60:40 at 75 ℃ for 5 hours, and toughening and modifying to obtain the modified oil-soluble curing agent.
Heating quartz sand or ceramsite sand to 140 ℃, adding the modified epoxy resin, mixing for 30s, adding the modified oil-soluble curing agent, and mixing for 30s to obtain the alkali-resistant coated sand C, wherein the mass ratio of the quartz sand or ceramsite sand to the modified epoxy resin to the modified oil-soluble curing agent is 100:3: 4.
Example 4
Taking the alkali-resistant coating sand A, and applying the alkali-resistant coating sand A to apricot 7-31-E57 wells in apricot hillock oil fields:
description of the (first) case: the block name is three-element composite flooding of east III blocks of the Xingqi zone, and the drilling completion date is 2014-11-28. The well completion depth is 1188m, and the artificial bottom hole is 1172.8 m. The completion mode is casing perforation completion.
(II) geological design requirements
And the PI32 interval and the PI33 interval are fractured by adopting multiple fractures, and 15 square sands are added in each fracture. Alkali-resistant resin sand is required to be applied after the sand is finished.
(III) alkali-resistant sand coating procedure
Concrete steps of tail-dressing alkali-resistant coating sand
(1) Performing fracturing construction operation, and executing the following procedure of performing alkali-resistant sand coating after all fracturing propping agents are pumped;
(2) using fracturing sand-carrying fluidsCarrying alkali-resistant coating sand, the discharge capacity of the sand-carrying liquid is 3.0m3Min, 3.8m per crack3；
(3) Pumping the displacement fluid, shutting in the well, initially setting for 240min, and back injecting 70 deg.C hot water for 24m3；
(4) And closing the well and waiting for setting for 96 hours after the fracturing construction is finished.
Wherein, the specific injection data of the pad fluid, the sand carrying fluid and the displacing fluid of the first fracture are shown in the table 1.
TABLE 1 specific injection data for pad fluid, sand-carrying fluid and displacement fluid
Setting the time for waiting coagulation according to the formation temperature when the displacement fluid is in place, and putting the pump down for production according to the design requirement of the prescription A.
Example 5
The alkali-resistant coated sand B and the alkali-resistant coated sand C are respectively applied to fracturing construction of four oil extraction plants in Daqing oil fields, the application well example of the alkali-resistant coated sand after the application well is shown in a table 2, and the effect is shown in a table 3.
TABLE 2 example of application of the after-dressing alkali-resistant coated sand
TABLE 3 effects of the application of the after-dressing alkali-resistant coating sand
As can be seen from the implementation case: the oil well liquid production amount is greatly increased, the oil production amount is increased by more than 3 times, the maximum oil production amount is increased by nearly 10 times, the excellent permeability increasing and yield increasing effects are achieved, and the water injection well comprises: the injection pressure is reduced, the injection amount is greatly increased, especially the over-pressure injection of an existing water injection well can not be carried out, the effect of reducing the pressure and increasing the injection can be achieved, the popularization and the application of the product can improve the alkali injection, flooding, injection and production effects, the production period is prolonged for decades, the old oil zone is revitalized, and the ideal target of low cost for petroleum contribution and mutual profit and win of the country is achieved.
Claims (10)
1. The alkali-resistant coated sand is characterized by comprising quartz sand or ceramsite sand, epoxy resin and an oil-soluble curing agent; wherein the mass ratio of the quartz sand or the ceramsite sand to the epoxy resin to the oil-soluble curing agent is 100:3-8: 3-10.
2. The coated sand of claim 1, wherein the epoxy resin is a modified epoxy resin, and the modified epoxy resin is a paraffin-encapsulated epoxy resin.
3. The coated sand as claimed in claim 1, wherein the oil-soluble curing agent is an oil-soluble curing agent consisting of polyisocyanate and polyol, and the mass ratio of polyisocyanate: the polyol is 60-80: 40-20, and the polyisocyanate is preferably: polyol 70: 30.
4. The coated sand of claim 3, wherein the polyol is one or more of ethylene glycol, propylene glycol, butylene glycol, and hexylene glycol.
5. A method for preparing alkali-resistant coated sand as defined in any one of claims 1-4, characterized in that the preparation process comprises: mixing quartz sand or ceramsite sand, epoxy resin and an oil-soluble curing agent according to the mass ratio of 100:3-8:3-10 of the quartz sand or ceramsite sand to the epoxy resin to the oil-soluble curing agent to obtain the alkali-resistant coated sand.
6. The preparation method according to claim 5, wherein the epoxy resin is a modified epoxy resin, and the modification method comprises the following steps: and heating the epoxy resin to 120-150 ℃, preferably to 130 ℃, adding paraffin, and keeping the constant time for 2-5 hours, preferably 3 hours to obtain the modified epoxy resin.
7. The preparation method of claim 5, wherein the oil-soluble curing agent is prepared by reacting polyisocyanate and polyol at 70-85 ℃ for 3-6 h, preferably 4h, to perform toughening modification.
8. The preparation method of claim 5, wherein the mixing is carried out by heating quartz sand or ceramsite sand to 130-140 ℃, adding modified epoxy resin, mixing for 30-60 s, preferably 45s, adding oil-soluble curing agent, and mixing for 30-70 s, preferably 50s to obtain the alkali-resistant coated sand.
9. Use of alkali-resistant coated sand as defined in any one of claims 1 to 4 or alkali-resistant coated sand as defined in any one of claims 5 to 8 in an oil well.
10. The use of claim 9, wherein the fracturing sand carrier fluid is used to carry alkali-resistant coated sand, and the displacement of the sand carrier fluid is 2.0-4.0 m3Min, adding 3.0-4.0 m of each crack3。
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113321467A (en) * | 2021-06-01 | 2021-08-31 | 中铁大桥局集团有限公司 | Internal curing low-shrinkage lightweight aggregate ultrahigh-performance concrete and preparation method thereof |
| CN113816699A (en) * | 2021-11-23 | 2021-12-21 | 山东绿达建设发展集团有限公司 | Grouting material for repairing highway subgrade |
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