CN108825185B - A method of prevent oil field bottom water from advancing by leaps and bounds - Google Patents
A method of prevent oil field bottom water from advancing by leaps and bounds Download PDFInfo
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- CN108825185B CN108825185B CN201810644428.8A CN201810644428A CN108825185B CN 108825185 B CN108825185 B CN 108825185B CN 201810644428 A CN201810644428 A CN 201810644428A CN 108825185 B CN108825185 B CN 108825185B
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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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
-
- 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
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/584—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
-
- 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
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/588—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific polymers
-
- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- Environmental & Geological Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
Present disclose provides a kind of methods for preventing oil field bottom water from advancing by leaps and bounds, this method comprises: advancing by leaps and bounds a little nearest injection-production well as water injection well apart from bottom water among multiple injection-production wells that the oil reservoir that bottom water is advanced by leaps and bounds occurs, and reinjected water is injected into the water injection well to displace the crude oil in oil reservoir, and it is used as producing well to produce crude oil at least one of the injection-production well other than the water injection well, the nano particle for being 10nm~300nm containing partial size after swelling in the reinjected water, and the nano particle keeps stable dispersion not stratified in the reinjected water.Through the above technical solutions, oil field bottom water can be effectively prevent to advance by leaps and bounds.
Description
Technical field
This disclosure relates to applied chemistry field, and in particular, to a method of prevent oil field bottom water from advancing by leaps and bounds.
Background technique
It in oilfield development process, is frequently run onto bottom water and advances by leaps and bounds, cause well water excessively high or even sudden water flooding, produce
The problem of efficiency sharply declines, and oil recovery factor can not improve.This is because oil layer energy is sharply since upper layer crude oil is plucked out of
It reduces, the metastable condition of original grease layering is broken, and the permeability in porous media of water is significantly larger than crude oil
Permeability causes bottom water up to be advanced by leaps and bounds under the driving of water layer internal energy.
To solve this problem, the method used in the past is water blockoff, using materials such as polymer gel or superfine cements, from
Oil well injection, it is expected that the point that bottom water plugging is advanced by leaps and bounds, even if make bottom water no longer on gush or gushed on continuing also and need by streaming, to reach
To the purpose of decreasing water cut and increasing oil.But the practice result of decades proves, the method effect is poor, and validity period is short, the reason is that injection material
Expect that unlikely inverse bottom water is gushed out opposite high energy direction and injected, meanwhile, it is a little blocked even if bottom water is advanced by leaps and bounds, due to oil reservoir and bottom
Existing pressure difference and the permeability of water-oil phase are excessive between water layer, still will form others and advance by leaps and bounds a little.
Summary of the invention
The purpose of the disclosure is to prevent oil field bottom water from advancing by leaps and bounds.
To achieve the goals above, the disclosure provides a kind of method for preventing oil field bottom water from advancing by leaps and bounds, this method comprises: will hair
A little nearest injection-production well is advanced by leaps and bounds as water injection well apart from bottom water among the multiple injection-production wells for the oil reservoir that raw bottom water is advanced by leaps and bounds, and to institute
It states and injects reinjected water in water injection well to displace the crude oil in oil reservoir, and by least one in the injection-production well other than the water injection well
It is a to be used as producing well to produce crude oil, the nano particle for being 10nm~300nm containing partial size after swelling in the reinjected water, and institute
State nano particle keeps stable dispersion not stratified in the reinjected water.
The inventor of the disclosure by concentrating on studies for many years, it is understood that does not follow darcy in the seepage flow of oil deposit deep part, water
Law, but rely primarily on the capillary force that porous media structure and water are formed and form slowly seepage flow, using with water specific gravity
Water and rock caused by the Brownian movement for the partial size nano particle appropriate for quite and in reinjected water keeping stable dispersion not stratified
The reduction of stone interfacial tension reduces capillary force, realizes the reduction of water percolation ability, on the one hand avoids following in vain for reinjected water
On the other hand ring also avoids reinjected water itself and is blocked.By close bottom in the reinjected water injection oil reservoir containing the nano particle
Water is advanced by leaps and bounds position a little, can efficiently use the energy of reinjected water to supplement the energy of oil reservoir, maintains the pressure of oil reservoir, guarantees oil
The pressure difference and permeability of hiding and bottom water interlayer prevent water breakthrough caused by reinjected water in optimum range, realize oil reservoir and bottom water
The energy balance of layer, through the above technical solutions, can effectively prevent bottom water from advancing by leaps and bounds the problem excessively high with well water.
Also, in technical solution provided by the disclosure, it is prominent close to bottom water that nano particle follows water flow to enter oil deposit deep part
Into the position of point, the specific gravity and size of nano particle are migrating within the scope of the 10nm~300nm that Brownian movement can occurs
Seepage flow relies primarily on the oil reservoir position for the capillary force that pore structure and water are formed, and Brownian movement occurs, and reduces water in hole
Percolation ability, but pore throat is not blocked substantially.It is possible thereby to solve the problems, such as the oil reservoir conformability of technique of polymer flooding, that is to say, that nothing
By how high temperature and high salt, be how many regardless of pH value, regardless of whether reinjected water by stringent processing, will not influence raising petroleum and adopt
The ability of yield；Thus previous cross-linked polymer, body varicosity particle, polymer microballoon technology etc. are also solved by closure seepage flow
Between injection existing for the pore throat material of channel and closure efficiency the problem of contradiction；Further, it is also possible to online injection is used, as long as
The amount of injection nanosphere is matched according to design concentration on waterflood-transmission line, that is, forms the colloid point for keeping stable dispersion not stratified
It dissipates and is and plays the function of reducing permeability and do not block pore throat, equipment is simple, is not necessarily to great amount of investment；As long as according to reinjected water
Composition adjusts the composition and partial size of the functional monomer of nano particle, is adapted to completely；Seepage flow due to reducing water, which relies on, to be received
Brownian movement of the rice grain in finite size hole, as long as the percolation ability of water reduces, the water containing nano particle will be certainly
Turn is adaptive and self-control process to other holes, therefore, strict control concentration is not necessarily in use process；Similarly, it infuses
Be continuously injected into without the large dosage as polymer solution during entering, but can the injection of intermittent or slug formula, at any time may be used
With observing effect or the adjustment injection parameter of stopping, it is very beneficial for realizing high investment output ratio；Similarly, it can adjust and adopt at any time
The Production development of oil well realizes high yield.
Other feature and advantage of the disclosure will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
Attached drawing is and to constitute part of specification for providing further understanding of the disclosure, with following tool
Body embodiment is used to explain the disclosure together, but does not constitute the limitation to the disclosure.In the accompanying drawings:
Fig. 1 is the particle diameter distribution of the nano particle initial (not being swollen) of embodiment 1.
Fig. 2 is the particle diameter distribution of the nano particle initial (not being swollen) of comparative example 1.
Fig. 3 is the particle diameter distribution after the nano particle swelling of embodiment 1.
Fig. 4 is the particle diameter distribution after the nano particle swelling of comparative example 1.
Fig. 5 is that the comparison before and after a kind of specific embodiment of the method for preventing oil field bottom water from advancing by leaps and bounds of the disclosure is implemented is shown
It is intended to.
Fig. 6 is that second of specific embodiment of the method for preventing oil field bottom water from advancing by leaps and bounds of the disclosure implements the comparison of front and back
Schematic diagram.
Fig. 7 is that the third specific embodiment of the method for preventing oil field bottom water from advancing by leaps and bounds of the disclosure implements the comparison of front and back
Schematic diagram.
Description of symbols
1 bottom aquifer, 2 oil reservoir
3 water injection well, 4 producing well
56 bottom waters of reinjected water containing nano particle are advanced by leaps and bounds a little
Specific embodiment
It is described in detail below in conjunction with specific embodiment of the attached drawing to the disclosure.It should be understood that this place is retouched
The specific embodiment stated is only used for describing and explaining the disclosure, is not limited to the disclosure.
Present disclose provides a kind of methods for preventing oil field bottom water from advancing by leaps and bounds, this method comprises: the oil that generation bottom water is advanced by leaps and bounds
A little nearest injection-production well is advanced by leaps and bounds as water injection well apart from bottom water among multiple injection-production wells of hiding, and is injected into the water injection well
Reinjected water the crude oil in oil reservoir to be displaced, and by least one of injection-production well other than the water injection well as producing well with
Crude oil, the nano particle for being 10nm~300nm containing partial size after swelling in the reinjected water are produced, and the nano particle is in institute
Stating in reinjected water keeps stable dispersion not stratified.
Wherein, the partial size of nano particle is the partial size being measured by dynamic light scattering or transmission electron microscope method
Numerical value, the partial size after referring to fully dispersed swelling.Wherein, the nano particle kept in the reinjected water stable dispersion regardless of
Layer refer to the nano particle is stood in the reinjected water 100 hours or more it is not stratified, preferably standing 200 hours or more regardless of
Layer, more preferably standing 300 hours or more not stratified.
Wherein, described to be adopted apart from bottom water a little nearest injection-production well of advancing by leaps and bounds for multiple notes of oil reservoir that bottom water be advanced by leaps and bounds occur
Injection-production well among well with highest liquid measure and/or highest moisture content.
Specifically this method may include: as shown in figure 5, the liquid measure and moisture content of left side injection-production well are lower than right side injection-production well
Liquid measure and moisture content, then right side injector-producer distance bottom water advance by leaps and bounds a little more into；Alternatively, as shown in fig. 6, left side injection-production well and right side
The liquid measure and moisture content of injection-production well are lower than the liquid measure and moisture content of intermediate injection-production well, then intermediate injector-producer distance bottom water is advanced by leaps and bounds a little more
Into；Alternatively, as shown in fig. 7, the liquid measure and moisture content of left side injection-production well be lower than right side injection-production well liquid measure and moisture content, then right side
Injector-producer distance bottom water advance by leaps and bounds a little more into.
Optionally, wherein the nano particle for being 50nm~220nm containing partial size in the reinjected water.
Optionally, wherein the nano particle forms colloidal dispersion in the reinjected water；The nano particle is in institute
Surface in reinjected water is stated to have charge and there is lesser partial size after being swollen.
Optionally, wherein the reinjected water of the nano particle is added, compared to the reinjected water that the nano particle is not added,
The water penetration rate of the sand body of the oil reservoir can be declined 70% or more and 98% or less.
Optionally, wherein in the reinjected water, by weight, the content of the nano particle is 0.05%~0.5%,
Preferably 0.08~0.2%.
Optionally, wherein the preparation method of the nano particle includes: that the aqueous solution of polymerized monomer is added to oily mutually Jie
Polymerization reaction system is obtained in matter and carries out visible light photosensitizer polymerization, is obtained polymerizate, is then dispersed in polymerizate
In the reinjected water；The polymerized monomer includes acrylamide and modified monomer, and the oil-phase medium includes solvent naphtha and surface
Activating agent and visible light initiator.
Wherein, it is seen that the polymerization of light photosensitizer is easier control reaction speed, is that the nano particle can have 10nm
The reason of appropriate particle size of~300nm.Wherein, the surface in the reinjected water of the nano particle with charge and is swollen
There is lesser partial size afterwards, therefore stable dispersion can be kept not stratified in the reinjected water.
Optionally, wherein the polymerization reaction system contains: the water of 20~50 parts by weight, the acryloyl of 5~30 parts by weight
The modified monomer of amine, 0~15 parts by weight, the solvent naphtha of 10~30 parts by weight, the surface-active of 20~40 parts by weight
The visible light initiator of agent and 0.001~1 parts by weight；Visible light photosensitizer polymerization light source used be LED light, xenon lamp,
Halogen lamp, incandescent lamp or sunlight.
Optionally, wherein solvent naphtha described in the aqueous solution of the polymerized monomer is white oil, and the modified monomer includes pair
Vinylbenzenesulfonic acid, acrylic acid, methacrylic acid, 2- acrylamide-2-methyl propane sulfonic, glycerol acrylate, pentaerythrite
Acrylate and N, at least one of N '-methylene-bisacrylamide, the surfactant are aliphatic anhydrous sorbitol
Ester, polyoxyethylene sorbitan fatty ester, Qula be logical, octyl phenol polyoxyethylene ether -10, fatty alcohol polyoxyethylene ether and
At least one of low molecular weight polyoxyethylene, the visible light initiator are methylenum careuleum, eosin, side's acid, N, N- diethyl benzal
Cycloalkane ketone and N, at least one of N- dimethyl benzal cycloalkane ketone.
It is particularly preferred that water first can be dissolved in for acrylamide and modified monomer, with NaOH tune pH to 6.5~7.5, normal
The oil comprising solvent naphtha, surfactant and visible light initiator is slowly dropped to while stirring under warm (10~35 DEG C)
In phase system, when forming fully transparent dispersion and conductivity lower than 2 μ S/m, stops that aqueous phase solution is added dropwise, continue to stir
It mixes 2-10 minutes.Pouring into can be led to nitrogen (99.999% is high-purity) 30-60 minutes with closed teat glass, be placed on it is visible
It is irradiated under visible LED or xenon lamp, halogen lamp, incandescent lamp or sunlight that photoinitiator absorbing wavelength matches, Zhi Daoti
It is no longer heat release.
Wherein, the condition of oil reservoir may include: temperature, pH, total salinity, wherein calcium ions and magnesium ions total amount, mean permeability
With viscosity of the crude oil in oil reservoir.Can be optimized and revised according to reservoir condition the formula of the aqueous solution of more preferably suitable monomer with
More preferably suitable nano particle is obtained, such as: in low temperature, low mineralization, low calcium and magnesium total ion concentration, low pH, increase propylene
The content of acid reduces the content of 2- acrylamide-2-methyl propane sulfonic；In high temperature, high salinity, high contents of calcium and magnesium total ion concentration, height
When pH value, the content of acrylic acid is reduced, increases the content to vinylbenzenesulfonic acid and 2- acrylamide-2-methyl propane sulfonic, together
Shi Tigao multi-group crosslink agent (including glycerol acrylate, pentaerythritol acrylate and N, N '-methylene bisacrylamide acyl
Amine) content.The aqueous solution of preferred monomer can be selected by the sedimentation experiment carried out under the conditions of experiment indoor simulation
Formula is to obtain more preferable suitable nano particle.It can be according to the range and embodiment that the disclosure provides to the aqueous solution of monomer
Formula be adjusted.
Optionally, wherein after this method is run 30~90 days, if there is at least one of following A-B phenomenon, A,
The moisture content decline of the crude oil of producing well extraction；B, water filling well pressure slightly slowly rise, this method further include following X~
At least one of set-up procedure of Y: X keeps improving water injection rate under concentration of the nano particle in reinjected water；Y, simultaneously
It improves water injection rate and reduces concentration of the nano particle in reinjected water, but concentration is not less than 0.05%.
Present invention be described in more detail by the following examples.
Embodiment 1
Oil reservoir is located in common waterflooding oil field, and geological conditions is lacustrine facies, fluvial facies or delta deposit sandstone, storage
Layer is smooth, and mineral reserve condition is 25~70 DEG C of temperature, pH=7.0~7.8, and total salinity is 1000~36000mg/L, wherein calcium and magnesium
Total ion concentration is 15~1500mg/L, and mean permeability 1800mD, crude oil is 1~50cP in oil reservoir medium viscosity.Oil reservoir hair
Raw apparent bottom water is advanced by leaps and bounds.
According to this reservoir conditions, the synthesizing formula of nano particle in the reinjected water that is most preferably injected are as follows: water phase composition,
Water 28g, acrylamide 20g, acrylic acid 0.5g, to vinylbenzenesulfonic acid 1g, AMPSNa5g, N, N '-methylene-bisacrylamide
200mg, pentaerythritol acrylate 5mg are neutralized to pH=7.0 with 5%NaOH aqueous solution；Oily phase composition: No. 7 white oil 16g, rouge
Fat race sorbitan ester 8g, polyoxyethylene sorbitan fatty ester 1g, fatty alcohol polyoxyethylene ether 1.5g, methylenum careuleum
200mg。
Water phase is slowly dropped in oily phase while stirring under room temperature (10~35 DEG C), forms fully transparent point
When granular media system and conductivity are lower than 2 μ S/m, stop that aqueous phase solution is added dropwise, continue stirring 5 minutes, pouring into can be with closed glass
Test tube leads to 99.999% high pure nitrogen 45 minutes, exposes to system with the LED light of wavelength 650nm or tungsten halogen lamp and no longer generate heat.
The median particle size of gained nano particle is measured as 50nm with dynamic laser light scattering, when being added into reinjected water with 0.1 weight %,
The median particle size of gained nano particle after swelling is measured as 214nm with dynamic laser light scattering, and the nano particle is in institute
State that 10 days holding stable dispersions are stood in reinjected water is not stratified.
Select the injection-production well with highest liquid measure and highest moisture content among multiple injection-production wells of the oil reservoir as water filling
Well is added nano particle in reinjected water with the concentration of 0.1 weight % and injects water injection well, at 60 days, the crude oil of producing well extraction
Moisture content decline 1%, at this point, adjustment injected water volume, augmented injection 50%, and the concentration of nano particle in reinjected water is adjusted to
0.08 weight %, liquid measure are stepped up, and crude output increases, aqueous to drop to before producing well liquid measure is restored to measure at 80 days
90%, crude output doubles.Keep injection and production status constant, at 1 year, producing well is aqueous to drop to 85%, crude oil
Yield is 3 times before measure, and bottom water does not occur and advances by leaps and bounds.At this point, stopping adding the nano particle in reinjected water, effect is after continuation of insurance
It holds 1 year or more, bottom water occurs and advances by leaps and bounds needs 1 year or more.
Embodiment 2
Oil reservoir is located in common waterflooding oil field, and geological conditions is lacustrine facies, fluvial facies or delta deposit sandstone, storage
Layer is smooth, and mineral reserve condition is 25~70 DEG C of temperature, pH=7.8~8.2, and total salinity is 1000~36000mg/L, wherein calcium and magnesium
Total ion concentration is 15~1500mg/L, and mean permeability 1800mD, crude oil is 1~50cP in oil reservoir medium viscosity.Oil reservoir hair
Raw apparent bottom water is advanced by leaps and bounds.
According to this reservoir conditions, the synthesizing formula of nano particle in the reinjected water that is most preferably injected are as follows: water phase composition,
Water 28g, acrylamide 16g, acrylic acid 0.5g, to vinylbenzenesulfonic acid 2g, AMPSNa7g, N, N '-methylene-bisacrylamide
200mg, pentaerythritol acrylate 5mg are neutralized to pH=7.0 with 5%NaOH aqueous solution,；Oily phase composition: No. 7 white oil 16g,
Aliphatic sorbitan ester 8g, polyoxyethylene sorbitan fatty ester 1g, fatty alcohol polyoxyethylene ether 1.5g, eosin
150mg。
Water phase is slowly dropped in oily phase while stirring under room temperature (10~35 DEG C), forms fully transparent point
When granular media system and conductivity are lower than 2 μ S/m, stop that aqueous phase solution is added dropwise, continue stirring 5 minutes, pouring into can be with closed glass
Test tube leads to 99.999% high pure nitrogen 45 minutes, and the LED light or xenon lamp for being 520nm with wavelength expose to system and no longer generate heat.
The particle size of gained nano particle is measured as 60nm with dynamic laser light scattering, when being added into reinjected water with 0.1 weight %,
The median particle size of gained nano particle after swelling is measured as 200nm with dynamic laser light scattering, and the nano particle is in institute
State that 10 days holding stable dispersions are stood in reinjected water is not stratified.
Select the injection-production well with highest liquid measure and highest moisture content among multiple injection-production wells of the oil reservoir as water filling
The nano particle injection is added in water injection well with the concentration of 0.15 weight % in well, and at 45 days, the crude oil of producing well extraction contains
Water rate decline 1%, at this point, adjustment injected water volume, augmented injection 30%, and the concentration of nano particle in reinjected water is adjusted to 0.08 weight
% is measured, liquid measure is stepped up, and crude output increases, and at 60 days, before liquid measure is restored to measure, aqueous to drop to 90%, crude oil is produced
Amount doubles.Keep injection and production status constant, at 1 year, well water drops to 87%, before crude output is measure
2.5 times, and it is prominent that bottom water does not occur.At this point, stopping adding the nano particle in reinjected water, effect continues holding 1 year or more,
Bottom water occurs to advance by leaps and bounds needs 1 year or more.
Embodiment 3
Oil reservoir is located in common waterflooding oil field, and geological conditions is lacustrine facies, fluvial facies or delta deposit sandstone, storage
Layer is smooth, and mineral reserve condition is 65~90 DEG C of temperature, pH=6.8~8.5, and total salinity is 35000~85000mg/L, wherein calcium
Magnesium ion total amount is 15~1500mg/L, and mean permeability 350mD, minimum permeability is 10mD, and maximum permeability is
1000mD, crude oil are 1~20cP in oil reservoir medium viscosity.The oil reservoir occurs apparent bottom water and advances by leaps and bounds.
According to this reservoir conditions, the synthesizing formula of nano particle in the reinjected water that is most preferably injected are as follows: water phase composition,
Water 30g, acrylamide 15g, acrylic acid 0.3g, to vinylbenzenesulfonic acid 3g, AMPSNa8g, N, N '-methylene-bisacrylamide
200mg, pentaerythritol acrylate 5mg are neutralized to pH=7.0 with 5%NaOH aqueous solution；Oily phase composition: No. 7 white oil 17g, rouge
Fat race sorbitan ester 8.5g, polyoxyethylene sorbitan fatty ester 0.5g, fatty alcohol polyoxyethylene ether 2.0g, N, N- bis-
Ethyl benzal cycloalkane ketone 150mg.
Water phase is slowly dropped in oily phase while stirring under room temperature (10~35 DEG C), forms fully transparent point
When granular media system and conductivity are lower than 2 μ S/m, stop that aqueous phase solution is added dropwise, continue stirring 5 minutes, pouring into can be with closed glass
Test tube leads to 99.999% high pure nitrogen 45 minutes, is that 560nmLED lamp or xenon lamp expose to system and no longer generate heat with wavelength.Institute
The particle size for obtaining nano particle is measured as 50nm with dynamic laser light scattering, molten when being added into reinjected water with 0.1 weight %
The median particle size of gained nano particle after swollen is measured as 180nm with dynamic laser light scattering, and the nano particle is described
It is not stratified that 10 days holding stable dispersions are stood in reinjected water.
Select the injection-production well with highest liquid measure and highest moisture content among multiple injection-production wells of the oil reservoir as water filling
Nano particle injection is added in water injection well with the concentration of 0.15 weight % in well, at 30 days, the moisture content of the crude oil of producing well extraction
Decline 2%, water filling well pressure rise 0.1MPa, at this point, adjustment injected water volume, augmented injection 30%, and by nano particle in reinjected water
Concentration be adjusted to 0.10 weight %, liquid measure is stepped up, and crude output increases, aqueous before liquid measure is restored to measure at 70 days
Drop to 50%, crude output increases by 1.5 times.Keep injection and production status constant, at 1 year, well water drops to
40%, crude output is 3 times before measure, and bottom water does not occur and advances by leaps and bounds.At this point, stop adding the nano particle in injection water,
Effect continues holding 1 year or more, and bottom water occurs and advances by leaps and bounds needs 1 year or more.
Embodiment 4
Oil reservoir, which is located at, to be seeped in waterflooding oil field, and geological conditions is lacustrine facies, fluvial facies or delta deposit sandstone, reservoir
Smooth, mineral reserve condition is 65~90 DEG C of temperature, pH=6.8~7.5, and total salinity is 50000~180000mg/L, wherein calcium and magnesium
Total ion concentration is 1500~6500mg/L, and crude oil is 0.5~5cP, mean permeability 10mD in oil reservoir medium viscosity.Oil reservoir hair
Raw apparent bottom water is advanced by leaps and bounds.
According to this reservoir conditions, the synthesizing formula of nano particle in the reinjected water that is injected are as follows: water phase composition, water 26g, third
Acrylamide 16g, acrylic acid 0.1g, to vinylbenzenesulfonic acid 3g, AMPSNa 6g, N, N '-methylene-bisacrylamide 400mg are sweet
Oleyl alcohol acrylate 3mg is neutralized to pH=7.0 with 5%NaOH aqueous solution；Oily phase composition: No. 7 white oil 18g, aliphatic dehydration mountain
Pears alcohol ester 9g, polyoxyethylene sorbitan fatty ester 0.5g, fatty alcohol polyoxyethylene ether 2.0g, N, N- diethyl benzal cycloalkanes
Hydrocarbon ketone 150mg.
Water phase is slowly dropped in oily phase while stirring under room temperature (10~35 DEG C), forms fully transparent point
When granular media system and conductivity are lower than 2 μ S/m, stop that aqueous phase solution is added dropwise, continue stirring 5 minutes, pouring into can be with closed glass
Test tube leads to 99.999% high pure nitrogen 45 minutes, and the LED light or xenon lamp for being 560nm with wavelength expose to system and no longer generate heat.
The particle size of gained nano particle is measured as 60nm with dynamic laser light scattering, when being added into reinjected water with 0.1 weight %,
The median particle size of gained nano particle after swelling is measured as 200nm with dynamic laser light scattering, and the nano particle is in institute
State that 10 days holding stable dispersions are stood in reinjected water is not stratified.
Select the injection-production well with highest liquid measure and highest moisture content among multiple injection-production wells of the oil reservoir as water filling
Nano particle injection is added in water injection well with the concentration of 0.10 weight % in well, at 50 days, the moisture content of the crude oil of producing well extraction
Decline 5%, at this point, adjustment injected water volume, augmented injection 25%, liquid measure is stepped up, and crude output increases, and at 80 days, liquid measure is restored
To before measure, aqueous to drop to 60%, crude output increases by 13%.Continue to improve water injection rate, keeps the concentration of nano particle not
Become, Liquid output begins to ramp up, and at 1 year, well water drops to 55%, and crude output occurs than improving 50% before measure, and not
Bottom water is advanced by leaps and bounds.At this point, stopping Ghana's rice grain in injection water, effect continues holding 1 year or more, aqueous to restart to rise, hair
Raw bottom water is advanced by leaps and bounds needs 1 year or more.
Embodiment 5
Oil reservoir is located in offshore platform waterflooding oil field, and geological conditions is lacustrine facies, fluvial facies or delta deposit sand
Rock, reservoir is smooth, and mineral reserve condition is 60~85 DEG C of temperature, pH=6.8~8.3, and total salinity is 6000~40000mg/L,
Middle calcium ions and magnesium ions total amount is 500~1500mg/L, and mean permeability 3000mD, minimum permeability is 550mD, maximum permeability
For 10000mD, crude oil is 10~100cP in oil reservoir medium viscosity.Injecting water is recovered water and sea water mixing object.The oil reservoir occurs bright
Aobvious bottom water is advanced by leaps and bounds.
According to this reservoir conditions, the synthesizing formula of nano particle in the reinjected water that is most preferably injected are as follows: water phase composition,
Water 20g, acrylamide 20g, acrylic acid 1g, to vinylbenzenesulfonic acid 2g, AMPSNa5g, N, N '-methylene-bisacrylamide
400mg, pentaerythritol acrylate 3mg are neutralized to pH=7.0 with 5%NaOH aqueous solution；Oily phase composition: No. 7 white oil 18g, rouge
Fat race sorbitan ester 7g, polyoxyethylene sorbitan fatty ester 2g, fatty alcohol polyoxyethylene ether 1.5g, N, N- diethyl
Benzal cycloalkane ketone 200mg.
Water phase is slowly dropped in oily phase while stirring under room temperature (10~35 DEG C), forms fully transparent point
When granular media system and conductivity are lower than 2 μ S/m, stop that aqueous phase solution is added dropwise, continue stirring 5 minutes, pouring into can be with closed glass
Test tube leads to 99.999% high pure nitrogen 45 minutes, and the LED light or xenon lamp for being 560nm with wavelength expose to system and no longer generate heat.
The particle size of gained nano particle is measured as 50nm with dynamic laser light scattering, when being added into reinjected water with 0.1 weight %,
The median particle size of gained nano particle after swelling is measured as 180nm with dynamic laser light scattering, and the nano particle is in institute
State that 10 days holding stable dispersions are stood in reinjected water is not stratified.
Select the injection-production well with highest liquid measure and highest moisture content among multiple injection-production wells of the oil reservoir as water filling
Nano particle injection is added in water injection well with the concentration of 0.20 weight % in well, at 30 days, the moisture content of the crude oil of producing well extraction
Decline 10%, water filling well pressure rise 1.0Mpa, at this point, adjustment injected water volume, augmented injection 10%, and by nano particle in reinjected water
Concentration be adjusted to 0.15 weight %, liquid measure is stepped up, and crude output increases, aqueous before liquid measure is restored to measure at 60 days
Drop to 60%, crude output increases by 2 times.Keep injection and production status constant, at 1 year, well water drops to 55%,
Crude output is 2.25 times before measure, and bottom water does not occur and advances by leaps and bounds.At this point, injection water in stop Ghana's rice grain, effect after
Continuation of insurance is held 1 year or more, aqueous to restart to rise, and bottom water occurs and advances by leaps and bounds needs 1 year or more.
Comparative example 1
Oil reservoir is located in common waterflooding oil field, and geological conditions is lacustrine facies, fluvial facies or delta deposit sandstone, storage
Layer is smooth, and mineral reserve condition is 25~70 DEG C of temperature, pH=7.0~7.8, and total salinity is 1000~36000mg/L, wherein calcium and magnesium
Total ion concentration is 15~1500mg/L, and mean permeability 1800mD, crude oil is 1~50cP in oil reservoir medium viscosity.Oil reservoir hair
Raw apparent bottom water is advanced by leaps and bounds.
According to this reservoir conditions, the synthesizing formula of nano particle in the reinjected water that is injected are as follows: water phase composition, water 28g, third
Acrylamide 20g, acrylic acid 0.5g, to vinylbenzenesulfonic acid 1g, AMPSNa 5g, N, N '-methylene-bisacrylamide 200mg, season
Penta tetrol acrylate 5mg, is neutralized to pH=7.0 with 5%NaOH aqueous solution；Oily phase composition: No. 7 white oil 16g, aliphatic dehydration
Sorbitol ester 8g, polyoxyethylene sorbitan fatty ester 1g, fatty alcohol polyoxyethylene ether 1.5g, azodiisobutyronitrile 1.0g.
Water phase is slowly dropped in oily phase while stirring under room temperature (10~35 DEG C), forms fully transparent point
When granular media system and conductivity are lower than 2 μ S/m, stop that aqueous phase solution is added dropwise, continue stirring 5 minutes, pouring into can be with closed glass
Test tube leads to 99.999% high pure nitrogen 45 minutes, is no longer generated heat with the high voltage mercury lamp radiation of wavelength 1kW to system.Gained nanometer
The median particle size of particle is measured as 50nm with dynamic laser light scattering, when being added into reinjected water with 0.1 weight %, after swelling
The median particle size of gained nano particle is measured as 1.004 μm with dynamic laser light scattering, and the nano particle is in the re-injection
3 hours are stood in water, and sedimentation layering occurs.
Compared with the nano particle of the embodiment 1, the nano particle of comparative example 1 during uv photopolymerization due to gathering
Conjunction speed is fast, and products obtained therefrom partial size is larger, initial (the not being swollen) average grain diameter of the nano particle of embodiment 1 and comparative example 1 and grain
Diameter distribution is as depicted in figs. 1 and 2 respectively.
The nano particle of embodiment 1 and the nano particle of comparative example 1 are respectively in identical simulation re-injection oilfield sewage
After impregnating 10 days in (36000mg/L, 70 DEG C), nano particle has obtained abundant swelling, is surveyed after swelling with dynamic laser light scattering
It is as shown in Figure 3 and Figure 4 to obtain partial size difference.The median particle size of 1 gained nano particle of embodiment after swelling is 214nm, after swelling
1 gained nano particle of comparative example median particle size be 1004nm.
Using the concentration of 0.1 weight % addition nano particle injection water injection well, (water injection well is infused as lower curtate position in reinjected water
Adopt well), as the result is shown 90 days when bottom water advance by leaps and bounds phenomenon improve it is not obvious enough.
By embodiment 1-5 and comparative example 1 as it can be seen that the technical solution of the disclosure can effectively prevent bottom water to advance by leaps and bounds.
The preferred embodiment of the disclosure is described in detail in conjunction with attached drawing above, still, the disclosure is not limited to above-mentioned reality
The detail in mode is applied, in the range of the technology design of the disclosure, a variety of letters can be carried out to the technical solution of the disclosure
Monotropic type, these simple variants belong to the protection scope of the disclosure.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, can be combined in any appropriate way, in order to avoid unnecessary repetition, the disclosure to it is various can
No further explanation will be given for the combination of energy.
In addition, any combination can also be carried out between a variety of different embodiments of the disclosure, as long as it is without prejudice to originally
Disclosed thought equally should be considered as disclosure disclosure of that.
Claims (9)
1. a kind of method for preventing oil field bottom water from advancing by leaps and bounds, which is characterized in that this method comprises: the oil reservoir that generation bottom water is advanced by leaps and bounds
A little nearest injection-production well is advanced by leaps and bounds as water injection well apart from bottom water among multiple injection-production wells, and injects re-injection into the water injection well
At least one of injection-production well other than the water injection well is used as producing well to produce by water displacing the crude oil in oil reservoir
Crude oil, the nano particle for being 50nm~220nm containing partial size after swelling in the reinjected water, and the nano particle is at described time
Keep stable dispersion not stratified in water filling；The reinjected water of the nano particle is added, compared to time that the nano particle is not added
The water penetration rate of the sand body of the oil reservoir can be declined 70% or more and 98% or less by water filling.
2. according to the method described in claim 1, wherein, described apart from bottom water to advance by leaps and bounds a little nearest injection-production well prominent for bottom water occurs
Into oil reservoir multiple injection-production wells among the injection-production well with highest liquid measure and/or highest moisture content.
3. according to the method described in claim 1, wherein, the nano particle forms colloidal dispersion in the reinjected water.
4. according to the method described in claim 1, wherein, in the reinjected water, by weight, the content of the nano particle is
0.05%~0.5%.
5. according to the method described in claim 4, wherein, in the reinjected water, by weight, the content of the nano particle is
0.08~0.2%.
6. according to the method described in claim 1, wherein, the preparation method of the nano particle includes: by the water of polymerized monomer
Solution, which is added in oil-phase medium, to be obtained polymerization reaction system and carries out visible light photosensitizer polymerization, obtains polymerizate, then
Polymerizate is dispersed in the reinjected water；The polymerized monomer includes acrylamide and modified monomer, the oil-phase medium
Including solvent naphtha and surfactant and visible light initiator.
7. according to the method described in claim 6, wherein, the polymerization reaction system contains: the water of 20~50 parts by weight, 5~
The modified monomer of the acrylamide of 30 parts by weight, 0~15 parts by weight, the solvent naphtha of 10~30 parts by weight, 20~40 weight
The surfactant of part and the visible light initiator of 0.001~1 parts by weight；Visible light photosensitizer polymerization light used
Source is LED light, xenon lamp, halogen lamp, incandescent lamp or sunlight.
8. method according to claim 6 or 7, wherein solvent naphtha described in the aqueous solution of the polymerized monomer is white oil,
The modified monomer includes to vinylbenzenesulfonic acid, acrylic acid, methacrylic acid, 2- acrylamide-2-methyl propane sulfonic, propylene
Acid glyceride, pentaerythritol acrylate and N, at least one of N '-methylene-bisacrylamide, the surfactant are
Aliphatic sorbitan ester, polyoxyethylene sorbitan fatty ester, Qula be logical, octyl phenol polyoxyethylene ether -10, rouge
At least one of fat alcohol polyoxyethylene ether and low molecular weight polyoxyethylene, the visible light initiator are methylenum careuleum, eosin, side
Acid, N, at least one of N- diethyl benzal cycloalkane ketone and N, N- dimethyl benzal cycloalkane ketone.
9. according to the method described in claim 1, wherein, after this method is run 30~90 days, if there is in following A-B
At least one phenomenon, A, the moisture content decline of the crude oil of producing well extraction；B, water filling well pressure slightly slowly rise, this method
Further include the set-up procedure of following X or Y: X, keeps improving water injection rate under concentration of the nano particle in reinjected water；Y,
It improves water injection rate simultaneously and reduces concentration of the nano particle in reinjected water, but concentration is not less than 0.05%.
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| CN106703765A (en) * | 2017-01-09 | 2017-05-24 | 中国科学院理化技术研究所 | Visible artificial sand filling and oil flooding device with injection-production liquid level adjustment function, and application thereof |
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