CN107882537A - Super-hydrophobicity is prefilled with gravel sand-proof pipe and preparation method thereof - Google Patents
Super-hydrophobicity is prefilled with gravel sand-proof pipe and preparation method thereof Download PDFInfo
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- CN107882537A CN107882537A CN201711240756.3A CN201711240756A CN107882537A CN 107882537 A CN107882537 A CN 107882537A CN 201711240756 A CN201711240756 A CN 201711240756A CN 107882537 A CN107882537 A CN 107882537A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- 239000004576 sand Substances 0.000 claims abstract description 146
- 230000003075 superhydrophobic effect Effects 0.000 claims abstract description 120
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 55
- 239000000463 material Substances 0.000 claims description 48
- 239000000203 mixture Substances 0.000 claims description 29
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 28
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 16
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 14
- 239000011248 coating agent Substances 0.000 claims description 14
- 238000000576 coating method Methods 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 12
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 10
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical class CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 10
- 239000000839 emulsion Substances 0.000 claims description 10
- 239000007921 spray Substances 0.000 claims description 10
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 9
- -1 polytetrafluoroethylene Polymers 0.000 claims description 9
- 235000019441 ethanol Nutrition 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 7
- 230000004044 response Effects 0.000 claims description 7
- 239000012153 distilled water Substances 0.000 claims description 5
- 125000005909 ethyl alcohol group Chemical group 0.000 claims description 5
- 238000010422 painting Methods 0.000 claims description 5
- 229920002319 Poly(methyl acrylate) Polymers 0.000 claims description 2
- 238000011010 flushing procedure Methods 0.000 claims description 2
- 201000008752 progressive muscular atrophy Diseases 0.000 claims description 2
- 238000007654 immersion Methods 0.000 claims 1
- 239000003129 oil well Substances 0.000 abstract description 11
- 238000004140 cleaning Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 30
- 238000002156 mixing Methods 0.000 description 16
- 238000005096 rolling process Methods 0.000 description 15
- 238000013019 agitation Methods 0.000 description 13
- 239000004927 clay Substances 0.000 description 12
- 238000010521 absorption reaction Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 11
- 239000012535 impurity Substances 0.000 description 10
- 238000009736 wetting Methods 0.000 description 10
- 229920002845 Poly(methacrylic acid) Polymers 0.000 description 9
- 230000002209 hydrophobic effect Effects 0.000 description 8
- 239000007788 liquid Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- 230000009471 action Effects 0.000 description 5
- 238000002389 environmental scanning electron microscopy Methods 0.000 description 5
- 239000002904 solvent Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910052901 montmorillonite Inorganic materials 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000007795 chemical reaction product Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000005098 hot rolling Methods 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000001934 delay Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000005325 percolation Methods 0.000 description 1
- 239000011295 pitch Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
-
- 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
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/086—Screens with preformed openings, e.g. slotted liners
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
- C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D127/12—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C09D127/18—Homopolymers or copolymers of tetrafluoroethene
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Dispersion Chemistry (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Wood Science & Technology (AREA)
- Materials Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The present invention provides a kind of super-hydrophobicity and is prefilled with gravel sand-proof pipe and preparation method thereof.The super-hydrophobicity of the present invention is prefilled with gravel sand-proof pipe, including base tube, the super-hydrophobicity sand control pipe shell being set on the outside of the base tube and the super-hydrophobicity gravel layer being filled between the base tube and the super-hydrophobicity sand control pipe shell, the surface of the super-hydrophobicity sand control pipe shell has the first super-hydrophobic coat, the super-hydrophobicity gravel layer is heaped by super-hydrophobicity gravel to be formed, and the surface of the super-hydrophobicity gravel has the second super-hydrophobic coat.The super-hydrophobicity of the present invention, which is prefilled with gravel sand-proof pipe, can realize the self-cleaning function of sand block medium, and and can realizes the purpose of high water-cut well water-control oil-increasing, extends the steady output of oilwell phase.
Description
Technical field
The present invention relates to one kind to be prefilled with gravel sand-proof pipe, and in particular to a kind of super-hydrophobicity be prefilled with gravel sand-proof pipe and
Its preparation method.
Background technology
Sand control refers to be directed to oil reservoir and oil well condition in oil recovery process, correct selection well cementation, completion mode, formulated rationally
Exploitation measure, control producing pressure differential, limitation percolation flow velocity prevents the measure of sand plug.At present, mechanical sand control can be divided into two classes, the
A kind of mainly to carry out sand control using mechanical tubing string, mechanical tubing string is such as wire-wrapped screen, slotted liner, various sand screens；The party
Though method is simple and easy, but sand controlling result is poor, and sand control pipe is easily blocked by reservoir sand, so as to effectively reservoir sand be prevented to enter
Enter pit shaft.Second class is mainly the filling of tubing string gravel, its in pit shaft after the mechanical tubing string such as tripping in wire-wrapped screen or slotted liner,
It is filled in again with gravel or other similar materials in the annular space of mechanical tubing string and sleeve pipe, so as to form multistage filter sand barrier,
Sand controlling result is relatively preferable.
The production practices of loose sand oil accumulation sand proof well show, sand block medium (the sand block layer and gravel layer of mechanical screen casing)
Block one of subject matter for progressively turning into that puzzlement sand proof well normally produces.In sand proof well production process, formation fluid is taken
The solid phase tampers such as band stratum fine sand, mechanical admixture, clay shale easily block pre-fill sand prevention pipe and gravel layer, so as to cause to keep off
Sand medium permeability reduces, production capacity degradation.At present, oil extraction scene mainly by change sand control tubular construction design and
Parameter optimization realizes pre-fill sand prevention pipe anti-blockage function, but which can not effectively prevent the materials such as clay shale,
There are still sand block medium pore plugging, the decline of producing initial stage sand block medium permeability, gravel buildup permeability with external pressurized
The defects of increase of power substantially reduces.Therefore, urgent need design is a kind of can overcome the new of drawbacks described above to be prefilled with gravel sand control
Pipe.
The content of the invention
The present invention provides a kind of super-hydrophobicity and is prefilled with gravel sand-proof pipe and preparation method thereof, and the super-hydrophobicity is prefilled with gravel
Stone sand-proof pipe can either realize the self-cleaning function of sand block medium, and and can enough realizes the purpose of high water-cut well water-control oil-increasing.
The present invention provides a kind of super-hydrophobicity and is prefilled with gravel sand-proof pipe, including base tube, is set on the outside of the base tube
Super-hydrophobicity sand control pipe shell and the super-hydrophobicity gravel being filled between the base tube and the super-hydrophobicity sand control pipe shell
Layer, the surface of the super-hydrophobicity sand control pipe shell have the first super-hydrophobic coat, and the super-hydrophobicity gravel layer is by super-hydrophobic
Property gravel heaps to be formed, and the surface of the super-hydrophobicity gravel has the second super-hydrophobic coat.
The present inventor has found that existing the main reason for being prefilled with gravel sand control blockage is outside sand-proof pipe through numerous studies
Water conservancy diversion hole surface on shell forms certain thickness mud drum, because the permeability of mud drum is extremely low, and then causes the harvesting of oil well
Rate is reduced so as to influence production capacity.According to above-mentioned discovery, the present inventor devises a kind of super-hydrophobicity and is prefilled with gravel sand-proof pipe, leads to
Cross and coat one layer of super-hydrophobic coat (i.e. first super-hydrophobic coat and second on the surface of sand control pipe shell and gravel layer gravel respectively
Super-hydrophobic coat), prevent clay and pitch isopolarity impurity absorption to avoid in sand control pipe shell and gravel layer gravel surface
Sand-proof pipe case surface forms the mud drum of low-permeability.
In the present invention, super-hydrophobicity sand control pipe shell is the sand control pipe shell that outer surface is provided with the first super-hydrophobic coat；
Super-hydrophobicity gravel is the gravel that outer surface is provided with the second super-hydrophobic coat.Specifically, the surface-stable of the first super-hydrophobic coat
Contact angle (i.e. angle of wetting) is more than 150 °, is in rolling contact angle less than 10 °, the surface-stable contact angle of the second super-hydrophobic coat is more than
150 °, angle is in rolling contact less than 10 °；Meet above-mentioned surface-stable contact angle and be in rolling contact the coating of angle requirement i.e. with super thin
It is water-based.
The present invention is not limited strictly the material and thickness of the first super-hydrophobic coat and the second super-hydrophobic coat；Wherein,
First super-hydrophobic coat and the second super-hydrophobic coat can be identical or different super-hydrophobic coat.In addition, the first super-hydrophobic painting
The thickness of layer can be 5-10 μm；The thickness of second super-hydrophobic coat can be 5-10 μm.
In one embodiment, the first super-hydrophobic coat can be formed by the first super hydrophobic material, and the first super hydrophobic material can
With by including absolute ethyl alcohol, ammoniacal liquor, tetraethyl orthosilicate (TEOS), PMA (PMAA) and polytetrafluoroethylene (PTFE) (PTFE)
Raw material is made.The surface of sand control pipe shell provided with above-mentioned first super-hydrophobic coat forms super-hydrophobic required micron knot of receiving
Structure, hydrophobicity is good, can preferably prevent clay and pitch isopolarity impurity absorption in sand-proof pipe case surface.
Further, the second super-hydrophobic coat can be formed by the second super hydrophobic material, and the second super hydrophobic material can be dense
Spend the ptfe emulsion for 10-45wt%.Gravel hydrophobicity provided with above-mentioned second super-hydrophobic coat is good, can not only be good
Clay and pitch isopolarity impurity absorption are prevented well on gravel surface, additionally it is possible to realize certain water-control oil-increasing effect.
In the present invention, base tube and sand control pipe shell can use the conventional structure of this area；It is understood that
Multiple holes for water conservancy diversion are evenly distributed with base tube and sand control pipe shell.
Specifically, multiple pod apertures are evenly distributed with the super-hydrophobicity sand control pipe shell, on the base tube
Even to be distributed with multiple slots, the size of the pod apertures and slot is respectively less than the minimum dimension of the super-hydrophobicity gravel.To leading
The shape of discharge orifice and slot does not limit strictly；In one embodiment, the pod apertures can be that V-type be turned up lateral opening or rectangle
Hole, the shape of the slot can be rectangle.
In the present invention, gravel can use the conventional material of this area, it not limited strictly, such as can be super
Light ceramsite propping agent etc..Further, the particle diameter of the super-hydrophobicity gravel is 20-70 mesh, density≤1.0g/cm3；This is super thin
Water-based gravel can be floated in water, be advantageous to mitigate the tripping in resistance that super-hydrophobicity is prefilled with gravel sand-proof pipe.
The present invention is not limited strictly the thickness of super-hydrophobicity gravel layer, can be according to being actually needed reasonable setting；Institute
The thickness for stating super-hydrophobicity gravel layer for example could be arranged to 10-30mm.
In the present invention, each part can be assembled into super-hydrophobicity using usual manner and be prefilled with gravel sand-proof pipe；It is for example, super
Hydrophobicity sand control pipe shell be may be provided between sealed base and closure, and sealed base can be fixed with the outer wall of base tube to be connected
Connect, closure can be connected with the outer wall thread of base tube, clamping or be connected by pin.
The super-hydrophobicity of the present invention is prefilled with gravel sand-proof pipe, by setting above-mentioned super-hydrophobicity sand control pipe shell and super thin
Water-based gravel layer, fine sand, pitch, the impurity such as clay that stratum comes out can be ensured by sand block medium output, make it will not be by
In the water conservancy diversion hole and gravel layer that chemical action is blocked in sand control pipe shell and base tube；In addition, heaped by super-hydrophobicity gravel
The super-hydrophobicity gravel layer of formation had both realized sand block effect, had also reached the purpose of water-control oil-increasing, while avoid underground and prevent
Sandpipe de-plugging process complicated after blocking.Above-mentioned super-hydrophobicity is prefilled with gravel sand-proof pipe and efficiently solves existing sand control preliminary filling
Screen casing blockage problem caused by chemical action is filled out, delays the recovery time of oil well, is realized simultaneously for high water-cut well
The effect of water-control oil-increasing, effectively reduces oil well comprehensive water cut while sand control, realizes the mesh for extending steady output of oilwell phase
's.
The present invention also provides the preparation method that above-mentioned super-hydrophobicity is prefilled with gravel sand-proof pipe, wherein, it is described the first super thin
Water coating is formed by the first super hydrophobic material, and the preparation method of the first super hydrophobic material includes：
1) 5-8L ammoniacal liquor is added in 100L absolute ethyl alcohols, stirs and evenly mixs, obtains the first mixture；
2) 3-6L tetraethyl orthosilicates are added dropwise into the first mixture, stir and evenly mix, obtain the second mixture；
3) 0.5-1kg PMAs are added into the second mixture, stirs and evenly mixs, obtains the 3rd mixture；
4) 5-20L polytetrafluoroethylene (PTFE) is added into the 3rd mixture, stirs and evenly mixs, obtains the first super hydrophobic material.
In the present invention, ammoniacal liquor is the aqueous solution of the 25-28wt% containing ammonia；The mode stirred and evenly mixed can be magnetic agitation；
The particle diameter of PMA can be 200-400nm.In addition, the time of stirring can be 0.5-1.5h in step 1)；Step
2) time of stirring can be 2-4h in；The time of stirring can be 20-30h in step 3)；The time of stirring can in step 4)
Think 36-48h.
The first super hydrophobic material of the present invention is used as forerunner using absolute ethyl alcohol as dispersant and solvent using tetraethyl orthosilicate
Body, modifying super hydrophobicity is carried out to PMA using ammoniacal liquor as catalyst；Particularly, polytetrafluoro is added in modifying process
Ethene, the surface of super-hydrophobicity sand control pipe shell can be made to form super-hydrophobic required nanometer micrometer structure, so as to be advantageous at it
Surface forms based superhydrophobic thin films, and the wetting angle of super-hydrophobicity sand control pipe shell is more than 150 °, is not easy to be adhered to by sand grain, enters
And super-hydrophobicity is caused to be prefilled with gravel sand-proof pipe and there is certain anti-blockage capability.
In the present invention, the first super hydrophobic material can be sprayed on sand-proof pipe case surface and is formed in conventional manner and the first surpassed
Hydrophobic coating, so as to which super-hydrophobicity sand control pipe shell be made.
Specifically, the preparation method of the super-hydrophobicity sand control pipe shell includes：
Sand control pipe shell is pre-processed；
First super hydrophobic material is sprayed on to the surface of pretreated sand control pipe shell, solidified, formation the first surpasses
Hydrophobic coating, wherein spray distance are 20-30mm, spray pressure 0.2-0.6MPa, hardening time 60-84h；
Sand control pipe shell formed with the first super-hydrophobic coat is dried, obtains super-hydrophobicity sand control pipe shell, its
Middle drying temperature is 110-130 DEG C, drying time 4-6h.
Further, the pretreatment can include：Concentration is used to be soaked for 15-36wt% hydrochloric acid solution outside sand-proof pipe
Shell 20-40min, then rinsed repeatedly using acetone and/or absolute ethyl alcohol, then using distilled water flushing, finally at 110-130 DEG C
Dry 20-40min.
The above method of the present invention can ensure that the first super-hydrophobic coat for being formed by the first super hydrophobic material is attached well
In sand-proof pipe case surface so as to difficult for drop-off, the adhesion of the first super-hydrophobic coat is strong, is not easy to be characterized, and then ensure that
Super-hydrophobicity is prefilled with the job stability of gravel sand-proof pipe.
In the present invention, second super-hydrophobic coat is formed by the second super hydrophobic material, and the second super hydrophobic material can be with
The ptfe emulsion for being 10-45wt% for concentration.
Second super hydrophobic material can be formed the second super-hydrophobic coat by the present invention coated in gravel surface in conventional manner, from
And super-hydrophobicity gravel is made.
Specifically, the preparation method of the super-hydrophobicity gravel includes：
Gravel is pre-processed；
Pretreated gravel is placed in second super hydrophobic material, the heating response 20-28h at 60-80 DEG C；
Heating response product is filtered, is mixed and is copied, solidifies, forms the second super-hydrophobic coat；
Gravel formed with the second super-hydrophobic coat is dried, obtains super-hydrophobicity gravel, wherein drying temperature is
110-130 DEG C, drying time 0.5-1.5h.
Further, the pretreatment includes：Gravel is rinsed using clear water repeatedly, 20- is then dried at 110-130 DEG C
40min。
Super-hydrophobicity gravel prepared by the above method of the present invention, water are in globule shape on its surface, and angle of wetting is more than 150 °, resistance
Water effect is good, water absorption rate 0%, does not absorb water substantially；Particularly, the above method can ensure what is formed by the second super hydrophobic material
Second super-hydrophobic coat is attached to gravel surface so as to difficult for drop-off well, and then ensure that super-hydrophobicity is prefilled with gravel and prevented
The job stability of sandpipe.
The implementation of the present invention, at least has the advantage that：
1st, super-hydrophobicity of the invention is prefilled with gravel sand-proof pipe, by the surface of sand control pipe shell and gravel layer gravel
One layer of super-hydrophobic coat is coated, prevents clay and pitch isopolarity impurity absorption in sand control pipe shell and gravel layer gravel table
Face, the mud drum that sand-proof pipe case surface forms low-permeability is avoided, improve the recovery ratio of oil well.
2nd, super-hydrophobicity of the invention is prefilled with fine sand, pitch, clay that gravel sand-proof pipe can ensure that stratum comes out etc.
Impurity makes it not to be blocked in the pod apertures and gravel of sand control pipe shell and base tube due to chemical action by sand block medium output
In layer, sand block effect was both realized, has also reached the purpose of water-control oil-increasing, has realized the purpose for extending the steady output of oilwell phase.
3rd, super-hydrophobicity of the invention is prefilled with the preparation method of gravel sand-proof pipe, significantly increases super-hydrophobicity sand-proof pipe
The surface hydrophobicity ability of shell, improve the anti-blockage capability that super-hydrophobicity is prefilled with gravel sand-proof pipe；In addition, first is super-hydrophobic
Coating and the second super-hydrophobic coat can be attached to sand control pipe shell and gravel surface well so as to difficult for drop-off, and then ensure
Super-hydrophobicity is prefilled with the job stability of gravel sand-proof pipe.
Brief description of the drawings
Fig. 1 is that the super-hydrophobicity of an embodiment of the present invention is prefilled with the structural representation of gravel sand-proof pipe；
Fig. 2 is that the super-hydrophobicity of an embodiment of the present invention is prefilled with the inclined cross section figure of gravel sand-proof pipe；
Fig. 3 is that the super-hydrophobicity of an embodiment of the present invention is prefilled with the top view of gravel sand-proof pipe；
Fig. 4 is the ESEM collection of illustrative plates of the sand control pipe shell of embodiment 2；
Fig. 5 is the ESEM collection of illustrative plates of the super-hydrophobicity sand control pipe shell of embodiment 2；
Fig. 6 is the ESEM collection of illustrative plates of the sand control pipe shell with hydrophobic coating of reference examples 1.
Description of reference numerals：
1：Base tube；2：Super-hydrophobicity gravel layer；3：Super-hydrophobicity sand control pipe shell；4：Pod apertures；5：Slot.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, accompanying drawing and implementation below in conjunction with the present invention
Example, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is the present invention
Part of the embodiment, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not having
The every other embodiment obtained under the premise of creative work is made, belongs to the scope of protection of the invention.
Embodiment 1
With reference to shown in Fig. 1 to Fig. 3, super-hydrophobicity of the invention is prefilled with gravel sand-proof pipe, including base tube 1, is set in base
The super-hydrophobicity sand control pipe shell 3 in the outside of pipe 1 and the super-hydrophobicity being filled between base tube 1 and super-hydrophobicity sand control pipe shell 3
Gravel layer 2, the surface of super-hydrophobicity sand control pipe shell 3 have the first super-hydrophobic coat, and super-hydrophobicity gravel layer 2 is by super-hydrophobicity
Gravel heaps to be formed, and the surface of super-hydrophobicity gravel has the second super-hydrophobic coat.
In the present invention, super-hydrophobicity sand control pipe shell 3 is the sand control pipe shell that outer surface is provided with the first super-hydrophobic coat；
Wherein, the surface-stable contact angle of the first super-hydrophobic coat is more than 150 °, is in rolling contact angle less than 10 °, meets that above-mentioned surface is steady
The coating determined contact angle and be in rolling contact angle requirement has super-hydrophobicity.
The present invention is not limited strictly the super hydrophobic material (i.e. the first super hydrophobic material) for forming the first super-hydrophobic coat,
As long as meet above-mentioned surface-stable contact angle and be in rolling contact angle requirement.In the present embodiment, the first super hydrophobic material can
With by including absolute ethyl alcohol, ammoniacal liquor, tetraethyl orthosilicate (TEOS), PMA (PMAA) and polytetrafluoroethylene (PTFE) (PTFE)
Raw material is made.
In addition, the present invention is not limited strictly the thickness of the first super-hydrophobic coat, such as it can be 5-10 μm.In this reality
Apply in example, the thickness of the first super-hydrophobic coat is 5 μm or so.
When forming the first super-hydrophobic coat using above-mentioned first super hydrophobic material, the surface of super-hydrophobicity sand control pipe shell 3
Super-hydrophobic required nanometer micrometer structure is formd, hydrophobicity is good, can preferably prevent clay and pitch isopolarity impurity absorption
In sand-proof pipe case surface.
In the present invention, super-hydrophobicity gravel is the gravel that outer surface is provided with the second super-hydrophobic coat；Wherein, it is the second super thin
Water coating surface is steadily contacted angle and is more than 150 °, is in rolling contact angle less than 10 °, meets that above-mentioned surface-stable contact angle and rolling connect
The coating of feeler requirement has super-hydrophobicity.
The present invention is not limited strictly the super hydrophobic material (i.e. the second super hydrophobic material) for forming the second super-hydrophobic coat,
As long as meet above-mentioned surface-stable contact angle and be in rolling contact angle requirement.In the present embodiment, the second super hydrophobic material can
To be ptfe emulsion of the concentration as 10-45wt%.
In addition, the present invention is not limited strictly the thickness of the second super-hydrophobic coat, such as it can be 5-10 μm.In this reality
Apply in example, the thickness of the second super-hydrophobic coat is 5 μm or so.
When forming the second super-hydrophobic coat using above-mentioned second super hydrophobic material, the hydrophobicity of super-hydrophobicity gravel layer 2 is good,
Clay and pitch isopolarity impurity absorption can not only be prevented to realize certain water-control oil-increasing on gravel surface well
Effect.
The super-hydrophobicity of the present invention is prefilled with gravel sand-proof pipe, by being applied on the surface of sand control pipe shell and gravel layer gravel
One layer of super-hydrophobic coat (i.e. the first super-hydrophobic coat and the second super-hydrophobic coat) is covered, prevents clay and pitch isopolarity impurity
Adsorb and in sand control pipe shell and gravel layer gravel surface, avoid the mud drum that sand-proof pipe case surface forms low-permeability.
In the present invention, base tube 1 and sand control pipe shell can use the conventional structure of this area；It is understood that
Multiple holes for water conservancy diversion are evenly distributed with base tube 1 and sand control pipe shell.
Specifically, in the present embodiment, multiple pod apertures 4 are evenly distributed with super-hydrophobicity sand control pipe shell 3, in base
It is evenly distributed with multiple slots 5 on pipe 1, the size of pod apertures 4 and slot 5 is respectively less than the minimum dimension of super-hydrophobicity gravel.It is right
Pod apertures 4 and the shape of slot 5 do not limit strictly, and pod apertures 4 for example can be that V-type be turned up lateral opening or rectangular opening, slot 5
Shape can be rectangle.
In the present invention, gravel can use the conventional material of this area, and it is not limited strictly.In the present embodiment
In, gravel uses Superlight ceramsites proppant；Further, the particle diameter of super-hydrophobicity gravel is 20-70 mesh, density≤1.0g/
cm3.The super-hydrophobicity gravel can be floated in water, be advantageous to mitigate the tripping in resistance that super-hydrophobicity is prefilled with gravel sand-proof pipe
Power.
The present invention is not limited strictly the thickness of super-hydrophobicity gravel layer 2, can be according to being actually needed reasonable setting；It is super
The thickness of hydrophobicity gravel layer 2 for example could be arranged to 10-30mm.
In the present invention, each part can be assembled into super-hydrophobicity using usual manner and be prefilled with gravel sand-proof pipe；It is for example, super
Hydrophobicity sand control pipe shell 3 be may be provided between sealed base and closure, and sealed base can be fixed with the outer wall of base tube 1 to be connected
Connect, closure can be connected with the outer wall thread of base tube 1, clamping or be connected by pin.
The super-hydrophobicity of the present invention is prefilled with gravel sand-proof pipe, by setting above-mentioned super-hydrophobicity sand control pipe shell 3 and surpassing
Hydrophobicity gravel layer 2, it can ensure that fine sand, pitch, the impurity such as clay that stratum comes out by sand block medium output, make it will not
It is blocked in due to chemical action in the pod apertures 4 and gravel layer of sand control pipe shell and base tube 1；In addition, by super-hydrophobicity ruckle
The super-hydrophobicity gravel layer 2 that collection is formed both had realized sand block effect, had also reached the purpose of water-control oil-increasing, while avoid underground
Complicated de-plugging process after sand control blockage.Above-mentioned super-hydrophobicity is prefilled with gravel sand-proof pipe, and to efficiently solve existing sand control pre-
Screen casing blockage problem caused by chemical action is filled, delays the recovery time of oil well, it is real simultaneously for high water-cut well
The effect of water-control oil-increasing is showed, oil well comprehensive water cut is effectively reduced while sand control, realized and extend the steady output of oilwell phase
Purpose.
Embodiment 2
The super-hydrophobicity of the present embodiment is prefilled with the preparation method of gravel sand-proof pipe, comprises the following steps：
1st, the first super hydrophobic material is prepared
8L ammoniacal liquor (concentration 25-28wt%) is added in 100L absolute ethyl alcohols, magnetic agitation mixing 1h, obtains the first mixing
Thing.
4.5L tetraethyl orthosilicates are added dropwise into above-mentioned first mixture, continues magnetic agitation mixing 3h, obtains second
Mixture.
The PMA that 1kg particle diameters are 300nm is added into above-mentioned second mixture, continues magnetic agitation mixing
24h, obtain the 3rd mixture.
20L polytetrafluoroethylene (PTFE) is added into above-mentioned 3rd mixture, continues magnetic agitation mixing 42h, obtains the first super thin
Water material.
2nd, super-hydrophobicity sand control pipe shell is prepared
Sand control pipe shell 30min is soaked using 36wt% hydrochloric acid solution, acetone is then respectively adopted and ethanol enters repeatedly
Row is rinsed, then is rinsed using distilled water, and 30min is finally dried at 120 DEG C, completes the pretreatment of sand control pipe shell.
First super hydrophobic material of above-mentioned preparation is sprayed on to the surface of pretreated sand control pipe shell, spray distance is
25mm, spray pressure 0.3MPa, solidifies 72h at room temperature, and the firm first super-hydrophobic painting is formed in sand-proof pipe case surface
Layer.
Sand control pipe shell formed with above-mentioned first super-hydrophobic coat is placed in 120 DEG C of baking oven and dries 5h, is surpassed
Hydrophobicity sand control pipe shell.
Fig. 4 and Fig. 5 is respectively the ESEM collection of illustrative plates of sand control pipe shell and super-hydrophobicity sand control pipe shell；By Fig. 4 and Fig. 5
Understand, relative to non-modified sand control pipe shell, the surface roughness and surface hydrophobicity ability of super-hydrophobicity sand control pipe shell
Increase, super-hydrophobic required nanometer micrometer structure is formd on its surface, it is super-hydrophobic thin so as to be advantageous to be formed on its surface
Film.
After testing, the angle of wetting of super-hydrophobicity sand control pipe shell is more than 150 °, is in rolling contact angle less than 10 °；In addition, using
Super-hydrophobicity sand control pipe shell is soaked containing 3% montmorillonite mixed sand liquid (solvent is water), the results showed that：This is super thin
Water-based sand control pipe shell is not easy to be adhered to by sand grain, has good anti-blockage capability.
3rd, super-hydrophobicity gravel is prepared
Rinse gravel repeatedly using clear water 6 times, remove gravel surface and easily fall part or dust, then in 120 DEG C of baking
30min is dried in case, completes the pretreatment of gravel.
Pretreated gravel is soaked in the ptfe emulsion that concentration is 30wt%, in 70 DEG C of hot rolling oven
Middle heating response 24h；Then, filtering and heating reaction product is filtered, then mixing to copy to gravel surface does not have obvious liquid,
The ptfe emulsion on gravel surface is solidified, firm second super-hydrophobic coat is formed on gravel surface.
Gravel formed with the second super-hydrophobic coat is placed in heating, drying 1h in 120 DEG C of heating furnace, obtained super-hydrophobic
Property gravel.
After testing, water is in globule shape on super-hydrophobicity gravel surface, and angle of wetting is more than 150 °, is in rolling contact angle less than 10 °；
In addition, super-hydrophobicity gravel is soaked using water, the results showed that：The water absorption rate of the super-hydrophobicity gravel is 0%, and its is basic
Do not absorb water (water absorption rate of non-modified gravel up to 33% or so), and block-water effect is good.
4th, prepare super-hydrophobicity and be prefilled with gravel sand-proof pipe
Conventionally base tube, above-mentioned super-hydrophobicity sand control pipe shell and above-mentioned super-hydrophobicity gravel are assembled,
Super-hydrophobicity is made and is prefilled with gravel sand-proof pipe；Super-hydrophobicity is prefilled with the structure of gravel sand-proof pipe with reference to embodiment 1.
Embodiment 3
The super-hydrophobicity of the present embodiment is prefilled with the preparation method of gravel sand-proof pipe, comprises the following steps：
1st, the first super hydrophobic material is prepared
5L ammoniacal liquor (concentration 25-28wt%) is added in 100L absolute ethyl alcohols, magnetic agitation mixing 1.5h, it is mixed to obtain first
Compound.
6L tetraethyl orthosilicates are added dropwise into above-mentioned first mixture, continues magnetic agitation mixing 2h, it is mixed to obtain second
Compound.
The PMA that 0.5kg particle diameters are 200nm is added into above-mentioned second mixture, continues magnetic agitation mixing
20h, obtain the 3rd mixture.
10L polytetrafluoroethylene (PTFE) is added into above-mentioned 3rd mixture, continues magnetic agitation mixing 48h, obtains the first super thin
Water material.
2nd, super-hydrophobicity sand control pipe shell is prepared
Sand control pipe shell 40min is soaked using 15wt% hydrochloric acid solution, acetone is then respectively adopted and ethanol enters repeatedly
Row is rinsed, then is rinsed using distilled water, and 40min is finally dried at 110 DEG C, completes the pretreatment of sand control pipe shell.
First super hydrophobic material of above-mentioned preparation is sprayed on to the surface of pretreated sand control pipe shell, spray distance is
20mm, spray pressure 0.2MPa, solidifies 60h at room temperature, and the firm first super-hydrophobic painting is formed in sand-proof pipe case surface
Layer.
Sand control pipe shell formed with above-mentioned first super-hydrophobic coat is placed in 110 DEG C of baking oven and dries 6h, is surpassed
Hydrophobicity sand control pipe shell.
After testing, the angle of wetting of super-hydrophobicity sand control pipe shell is more than 150 °, is in rolling contact angle less than 10 °；In addition, using
Super-hydrophobicity sand control pipe shell is soaked containing 3% montmorillonite mixed sand liquid (solvent is water), the results showed that：This is super thin
Water-based sand control pipe shell is not easy to be adhered to by sand grain, has good anti-blockage capability.
3rd, super-hydrophobicity gravel is prepared
Rinse gravel repeatedly using clear water 6 times, remove gravel surface and easily fall part or dust, then in 110 DEG C of baking
40min is dried in case, completes the pretreatment of gravel.
Pretreated gravel is soaked in the ptfe emulsion that concentration is 45wt%, in 60 DEG C of hot rolling oven
Middle heating response 20h；Then, filtering and heating reaction product is filtered, then mixing to copy to gravel surface does not have obvious liquid,
The ptfe emulsion on gravel surface is solidified, firm second super-hydrophobic coat is formed on gravel surface.
Gravel formed with the second super-hydrophobic coat is placed in heating, drying 0.5h in 110 DEG C of heating furnace, obtained super thin
Water-based gravel.
After testing, water is in globule shape on super-hydrophobicity gravel surface, and angle of wetting is more than 150 °, is in rolling contact angle less than 10 °；
In addition, super-hydrophobicity gravel is soaked using water, the results showed that：The water absorption rate of the super-hydrophobicity gravel is 0%, and its is basic
Do not absorb water, block-water effect is good.
4th, prepare super-hydrophobicity and be prefilled with gravel sand-proof pipe
Conventionally base tube, above-mentioned super-hydrophobicity sand control pipe shell and above-mentioned super-hydrophobicity gravel are assembled,
Super-hydrophobicity is made and is prefilled with gravel sand-proof pipe；Super-hydrophobicity is prefilled with the structure of gravel sand-proof pipe with reference to embodiment 1.
Embodiment 4
The super-hydrophobicity of the present embodiment is prefilled with the preparation method of gravel sand-proof pipe, comprises the following steps：
1st, the first super hydrophobic material is prepared
6.5L ammoniacal liquor is added in 100L absolute ethyl alcohols, magnetic agitation mixing 0.5h, obtains the first mixture.
3L tetraethyl orthosilicates are added dropwise into above-mentioned first mixture, continues magnetic agitation mixing 4h, it is mixed to obtain second
Compound.
The PMA that 1kg particle diameters are 400nm is added into above-mentioned second mixture, continues magnetic agitation mixing
30h, obtain the 3rd mixture.
5L polytetrafluoroethylene (PTFE) is added into above-mentioned 3rd mixture, continues magnetic agitation mixing 36h, it is super-hydrophobic to obtain first
Material.
2nd, super-hydrophobicity sand control pipe shell is prepared
Sand control pipe shell 20min is soaked using 25wt% hydrochloric acid solution, acetone is then respectively adopted and ethanol enters repeatedly
Row is rinsed, then is rinsed using distilled water, and 20min is finally dried at 130 DEG C, completes the pretreatment of sand control pipe shell.
First super hydrophobic material of above-mentioned preparation is sprayed on to the surface of pretreated sand control pipe shell, spray distance is
30mm, spray pressure 0.6MPa, solidifies 84h at room temperature, and the firm first super-hydrophobic painting is formed in sand-proof pipe case surface
Layer.
Sand control pipe shell formed with above-mentioned first super-hydrophobic coat is placed in 130 DEG C of baking oven and dries 4h, is surpassed
Hydrophobicity sand control pipe shell.
After testing, the angle of wetting of super-hydrophobicity sand control pipe shell is more than 150 °, is in rolling contact angle less than 10 °；In addition, using
Super-hydrophobicity sand control pipe shell is soaked containing 3% montmorillonite mixed sand liquid (solvent is water), the results showed that：This is super thin
Water-based sand control pipe shell is not easy to be adhered to by sand grain, has good anti-blockage capability.
3rd, super-hydrophobicity gravel is prepared
Rinse gravel repeatedly using clear water 6 times, remove gravel surface and easily fall part or dust, then in 130 DEG C of baking
20min is dried in case, completes the pretreatment of gravel.
Pretreated gravel is soaked in the ptfe emulsion that concentration is 10wt%, in 80 DEG C of hot rolling oven
Middle heating response 28h；Then, filtering and heating reaction product is filtered, then mixing to copy to gravel surface does not have obvious liquid,
The ptfe emulsion on gravel surface is solidified, firm second super-hydrophobic coat is formed on gravel surface.
Gravel formed with the second super-hydrophobic coat is placed in heating, drying 1.5h in 130 DEG C of heating furnace, obtained super thin
Water-based gravel.
After testing, water is in globule shape on super-hydrophobicity gravel surface, and angle of wetting is more than 150 °, is in rolling contact angle less than 10 °；
In addition, super-hydrophobicity gravel is soaked using water, the results showed that：The water absorption rate of the super-hydrophobicity gravel is 0%, and its is basic
Do not absorb water, block-water effect is good.
4th, prepare super-hydrophobicity and be prefilled with gravel sand-proof pipe
Conventionally base tube, above-mentioned super-hydrophobicity sand control pipe shell and above-mentioned super-hydrophobicity gravel are assembled,
Super-hydrophobicity is made and is prefilled with gravel sand-proof pipe；Super-hydrophobicity is prefilled with the structure of gravel sand-proof pipe with reference to embodiment 1.
Reference examples 1
In this reference examples, divided by embodiment 2 prepare the first super hydrophobic material step in the 3rd mixture as first
Super hydrophobic material (being added without polytetrafluoroethylene (PTFE)) is formed outside hydrophobic coating in sand-proof pipe case surface, and remaining step is with implementing
Example 2 is identical.
Fig. 6 is the ESEM collection of illustrative plates of the sand control pipe shell with above-mentioned hydrophobic coating of this reference examples；As a result show, with
The super-hydrophobicity sand control pipe shell of embodiment 2 is compared, the wetting of the sand control pipe shell with above-mentioned hydrophobic coating of this reference examples
Angle is 100 ° or so (not forming super-hydrophobic coat), and its surface roughness and surface hydrophobicity ability are super thin not as good as embodiment 2
Water-based sand control pipe shell, show that its hydrophobic performance is far below the super-hydrophobicity sand control pipe shell of embodiment 2.
In addition, use containing 3% montmorillonite mixed sand liquid (solvent is water) to the sand-proof pipe with above-mentioned hydrophobic coating
Shell is soaked, the results showed that：Its surface attachment has certain sand grain, and anti-blockage capability is substantially less than embodiment 2
Super-hydrophobicity sand control pipe shell.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；To the greatest extent
The present invention is described in detail with reference to foregoing embodiments for pipe, it will be understood by those within the art that：Its according to
The technical scheme described in foregoing embodiments can so be modified, either which part or all technical characteristic are entered
Row equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology
The scope of scheme.
Claims (10)
1. a kind of super-hydrophobicity is prefilled with gravel sand-proof pipe, it is characterised in that including base tube, is set in surpassing on the outside of the base tube
Hydrophobicity sand control pipe shell and the super-hydrophobicity gravel layer being filled between the base tube and the super-hydrophobicity sand control pipe shell,
The surface of the super-hydrophobicity sand control pipe shell has the first super-hydrophobic coat, and the super-hydrophobicity gravel layer is by super-hydrophobicity gravel
Clitter collection is formed, and the surface of the super-hydrophobicity gravel has the second super-hydrophobic coat.
2. super-hydrophobicity according to claim 1 is prefilled with gravel sand-proof pipe, it is characterised in that the first super-hydrophobic painting
The thickness of layer is 5-10 μm；The thickness of second super-hydrophobic coat is 5-10 μm.
3. super-hydrophobicity according to claim 1 is prefilled with gravel sand-proof pipe, it is characterised in that the super-hydrophobicity gravel
Particle diameter be 20-70 mesh, density≤1.0g/cm3。
4. super-hydrophobicity according to claim 1 is prefilled with gravel sand-proof pipe, it is characterised in that prevents in the super-hydrophobicity
Multiple pod apertures are evenly distributed with sandpipe shell, are evenly distributed with multiple slots on the base tube, the pod apertures and are cut
The size of seam is respectively less than the minimum dimension of the super-hydrophobicity gravel.
5. any described super-hydrophobicity of Claims 1-4 is prefilled with the preparation method of gravel sand-proof pipe, it is characterised in that institute
State the first super-hydrophobic coat to be formed by the first super hydrophobic material, the preparation method of the first super hydrophobic material includes：
5-8L ammoniacal liquor is added in 100L absolute ethyl alcohols, stirs and evenly mixs, obtains the first mixture；
3-6L tetraethyl orthosilicates are added dropwise into the first mixture, stir and evenly mix, obtain the second mixture；
0.5-1kg PMAs are added into the second mixture, stirs and evenly mixs, obtains the 3rd mixture；
5-20L polytetrafluoroethylene (PTFE) is added into the 3rd mixture, stirs and evenly mixs, obtains the first super hydrophobic material.
6. preparation method according to claim 5, it is characterised in that the preparation method of the super-hydrophobicity sand control pipe shell
Including：
Sand control pipe shell is pre-processed；
First super hydrophobic material is sprayed on to the surface of pretreated sand control pipe shell, solidified, it is super-hydrophobic to form first
Coating, wherein spray distance are 20-30mm, spray pressure 0.2-0.6MPa, hardening time 60-84h；
Sand control pipe shell formed with the first super-hydrophobic coat is dried, super-hydrophobicity sand control pipe shell is obtained, wherein dry
Dry temperature is 110-130 DEG C, drying time 4-6h.
7. preparation method according to claim 6, it is characterised in that the pretreatment includes：Concentration is used as 15-
36wt% hydrochloric acid solution immersion sand control pipe shell 20-40min, is then rinsed, then adopt repeatedly using acetone and/or absolute ethyl alcohol
With distilled water flushing, finally in 110-130 DEG C of dry 20-40min.
8. preparation method according to claim 5, it is characterised in that second super-hydrophobic coat is by the second super-hydrophobic material
Material is formed, and the second super hydrophobic material is the ptfe emulsion that concentration is 10-45wt%.
9. preparation method according to claim 8, it is characterised in that the preparation method of the super-hydrophobicity gravel includes：
Gravel is pre-processed；
Pretreated gravel is placed in second super hydrophobic material, the heating response 20-28h at 60-80 DEG C；
Heating response product is filtered, is mixed and is copied, solidifies, forms the second super-hydrophobic coat；
Gravel formed with the second super-hydrophobic coat is dried, obtains super-hydrophobicity gravel, wherein drying temperature is 110-
130 DEG C, drying time 0.5-1.5h.
10. preparation method according to claim 9, it is characterised in that the pretreatment includes：Rinsed repeatedly using clear water
Gravel, 20-40min is then dried at 110-130 DEG C.
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| CN113958296A (en) * | 2021-03-24 | 2022-01-21 | 中国石油大学(华东) | Modified composite sand control well completion screen pipe with shunting function and containing cavity |
| CN113958296B (en) * | 2021-03-24 | 2024-02-02 | 中国石油大学(华东) | Modified composite cavity sand control well completion screen pipe with shunt function |
| CN112796715A (en) * | 2021-04-09 | 2021-05-14 | 东营明德石油科技有限公司 | Ternary water-control gas production method suitable for loose sandstone gas reservoir |
| US11485897B1 (en) | 2021-04-09 | 2022-11-01 | China University Of Petroleum(East China) | Ternary water control and gas recovery method suitable for unconsolidated siltstone gas reservoir |
| CN116004119A (en) * | 2021-10-22 | 2023-04-25 | 中国石油化工股份有限公司 | Sand control screen pipe for oil well and preparation method and application thereof |
| CN116004119B (en) * | 2021-10-22 | 2024-03-26 | 中国石油化工股份有限公司 | Sand control screen pipe for oil well and preparation method and application thereof |
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Application publication date: 20180406 |