CN104910886A - Preparation method of nano-oil recovery displacement agent NDA for construction of nano-apertures - Google Patents
Preparation method of nano-oil recovery displacement agent NDA for construction of nano-apertures Download PDFInfo
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Abstract
Belonging to the technologies of oil reservoir reserve and yield increase and oil recovery improvement, the invention provides a preparation method of a nano-oil recovery displacement agent NDA for construction of nano-apertures. The nano-oil displacement agent is characterized in that: the nano-oil displacement agent is prepared according to the underground rock components, oil-water components, permeability contrast, stratum temperature and pressure, and is used for dissolving polymer and removing polymer flooding formed blocking; air foams reduce the flow rate of mid-high permeability apertures to displace remaining oil; an imbibition agent enters nano-apertures rapidly; the solvent dissolving rocks and stratum generated latent acid construct and enlarge nano-apertures and micrometer apertures in dense base rock to enhance the adsorbed oil desorption speed; a neutral wetting agent enables the adsorbed oil to break away from the rock wall surface so as to form oil flow; through combined action, the diffusion speed and seepage velocity are enhanced, and the reserve and yield are increased. The nano-oil displacement agent can displace mid-high permeability, dense low permeation remaining oil, and also can output the adsorbed oil in base rock nano-apertures.
Description
Technical field:
The invention belongs to oil reservoir increasing the storage volume increase and improve recovery efficiency technique, the nanometer oil recovery oil-displacing agent NDA compound method of building nanoporous seam is provided especially.
Note: dissolve and refer to that Dispersion of Solute Matter becomes the physical process of solution in solvent.
Technical background:
Existing petroleum geology, petroleum engineering are all the petroleum engineering based on seepage flow.Existing petroleum geology, petroleum engineering only consider to be greater than porosity cutoff, can the reservoir of seepage flow.The hydrocarbon-bearing pool of China is all generally hypotonic, Oil in Super-low Permeability.Be no matter hypotonic, Oil in Super-low Permeability, in ooze, high permeability reservoir, permeability grade is all very large.Conventional oil-displacing agent can displace the part oil that height oozes macropore seam, high seepage hole stitch that wall and in hypotonic surplus oil cannot displace.China has exploited an oil reservoir extraction 30%-50% of 30-50 at present.Existing hydrocarbon-bearing pool of having developed is all that reserves abundance is very high can the reservoir of seepage flow.
The carbonatite oil field that nineteen fifty-five Sichuan discovery reserves are considerable.The Chongqing oil higher junior college (now changing Chongqing University of Science and Technology into) of nineteen fifty-one foundation far can not meet the needs in Sichuan carbonate oil field; Within 1956, set up Chengdu Geology College's (now changing Chengdu University of Technology into) and petroleum is set, still can not satisfy the demands the needs of Sichuan carbonate oil-field development; 1958 set up Sichuan petroleum institute (now changing Southwest Petrol University into).China only has Sichuan to have the university of three oil specialties.Regrettably, the Sichuan carbonate oil field that reserves are considerable does not have industrialized developing so far.Development difficulty is very big, and crack is extremely grown, water injection well and oil well apart ten kilometers, water injection well water filling, and oil well several days is with regard to water breakthrough.Basement rock is extremely fine and close.Whole oil field only has several mouthfuls of water injection wells.Sichuan carbonate oil-field development is a world-class difficult problem.
Molecular diameter about the 0.5nm of condensate oil.Molecular diameter about the 0.9nm of lightweight oil.The molecular diameter 10nm-200nm of pitch.The molecular diameter 100nm-200nm of paraffin.The about 50nm-300nm of molecular diameter of shale oil.For in the nano level hole below porosity cutoff, being enriched in nanoaperture with ADSORPTION STATE can not the flood tide adsorbed oil of seepage flow, does not all consider both at home and abroad to produce.The Objective Concept of reservoir can the high thin layer of seepage flow reserves abundance change into can seepage flow reserves abundance is high and adsorbed oil content is high thick-layer.
Shale oil is actual is adsorbed oil.All enrichment shale oil after whole eight gulf, the road group 200 meters of Tarim Basin In Xinjiang.The oil-sand also enrichment adsorbed oil of shallow-layer.Also enrichment adsorbed oil in the basement rock of thick oil reservoir.
For adsorbed oil, also there is no real development theories and method both at home and abroad.
Adsorbed oil reserves are extremely huge.Rock is finer and close, and the content of adsorbed oil is larger.In the fine and close basement rock of the oil reservoir developed, the content of adsorbed oil is also abnormal large.Nanometer displacement agent NDA builds, link up, expand nanoporous seam, builds nano level, micron order, grade map cracking, improves adsorbed oil desorption rate, makes the abnormal huge adsorbed oil suitability for industrialized production of reserves.
Summary of the invention:
The object of this invention is to provide a kind of nanometer displacement agent NDA compound method.The ultimate principle of preparation is: rock composition, profit composition, permeability grade, formation temperature and pressure under base area, polymer flooding blocking is removed in preparation, profile control, without acid dissolve and potential acid-soluble erosion rock, build, link up, expand nanoporous seam, imbibition and wetting agent change nanoporous slotted wall face rock wettability.By injecting nanometer displacement agent NDA from water injection well, dissolve polymer, remove the blocking that polymer injection is formed; Foam air profile control reduces the seepage velocity of high seepage hole seam, suppress out high seepage hole slotted wall face and in surplus oil in low seepage hole seam; Imbibition agent enters nanoporous seam fast, and the partial adsorbates oil of micron, nanoporous seam is displaced in imbibition, leads solvent, potential acid, neutral lubricant to enter nanoaperture simultaneously; Solvent, potential acid expand nanoporous seam; Intermediate wet agent makes adsorbed oil depart from rock wall, forms oil stream; Can expand by nanoporous seam, again can to become neutral water partially moistening wet in nanoporous slotted wall face, improve the desorption rate of adsorbed oil in nanoporous seam, improve the velocity of diffusion of adsorbed oil, seepage velocity simultaneously; Improve seepage velocity, the flow conductivity of surplus oil, really realize the adsorbed oil in both suitability for industrialized production oil reservoir basement rock, again can industrialization extraction high seepage hole slotted wall face, in surplus oil in low seepage hole seam, increasing the storage is increased production.Nanometer displacement agent can displace middle and high infiltration, fine and close hypotonic middle surplus oil, again can the adsorbed oil of output basement rock nanoporous seam.
The novelty of invention:
1. unheeded adsorbed oil in suitability for industrialized production oil reservoir basement rock.
2. expand the nanoporous seam of basement rock while foam profile control, both produced the adsorbed oil in oil reservoir basement rock, produce again high seepage hole slotted wall face, in surplus oil in low seepage hole seam, increasing the storage is increased production.
3. improve the adsorbed oil exploitation Theories and methods of desorption rate.
4. remove the novel method of polymer plugging.
The practicality of invention:
In shale oil oil reservoir, adsorbed oil reserves are large.There is a large amount of surplus oils in the hyper-tight sandstone oil reservoir developed, super dense carbonate oil reservoir, in basement rock, have again a large amount of adsorbed oil.Adopt nanometer displacement agent NDA water flooding recovery energy industrialization exploitation surplus oil and adsorbed oil, increasing the storage is increased production.Nanometer displacement agent NDA demand is large, market large, required time has persistence.The economic benefit of nanometer displacement agent NDA, social benefit are all difficult to the appraisal.The first, the surplus oil that industrialization exploitation is difficult adopts and cannot exploit adsorbed oil now, alleviation worldwide energy demand, energy war can gradually reduce, and the disaster of energy war also can gradually reduce.The second, the energy of China completely can self-sufficiency through productive labour fast, and break through and blocks the world of CNPC, the Chinese speed reformed can walk quickening greatly.3rd, the exploitation of surplus oil and adsorbed oil not only can solve a large amount of employment, more importantly ensures the energy demand that national all trades and professions grow at top speed, and is that country creates a large amount of income.
Note: basement rock refers to the Minerals And Rocks of reservoir rock skeleton.
Nanometer displacement agent NDA has practicality widely, can organize production in enormous quantities.
Nanometer displacement agent NDA may be used for shale oil, sandstone and tight sandstone reservoir, carbonatite and dense carbonate oil reservoir, as table 1.
The model of table 1 nanometer displacement agent NDA and feature
| Nanometer displacement agent NDA | Model | Feature |
| Sandstone oil reservoir nanometer displacement agent | NDAsa | Dissolve corrosion sandstone, remove polymer plugging |
| Carbonate Reservoir nanometer displacement agent | NDAca | Dissolve corrosion carbonatite, froth quality is high |
| Shale oil oil reservoir nanometer displacement agent | NDAsh | Dissolve corrosion shale, imbibition, wettability are good |
Example 1. sandstone oil reservoir nanometer displacement agent NDAsa
Feature: dissolve corrosion sandstone.First the oil well that polymer flooding is crossed increases the content of depolymerizing agent, removes polymer plugging.Later stage does not re-use depolymerizing agent.Tensio-active agent mainly uses positively charged ion and nonionic surface active agent.
Formula: solvent+5% ~ 30% potential acid+10% ~ 30% intermediate wet agent of sandstone is dissolved in 10% ~ 30% foam+10% ~ 30% dissolve polymer solvent+10% ~ 20% imbibition agent+10% ~ 30%.
The catalogue that 0.5% preparation of nano oil-displacing agent NDA prepares is designated as: circulate 20 minutes through truck-mounted blender, liquid distributing vehicle or high-duty pump, froth quality 30% ~ 75%; Transformation period 0.5min ~ 2min; The dissolution rate of the rock such as dissolve clays mineral (kaolinite, sodium bentonite, illite, chlorite), quartz, calcite, rhombspar, feldspar, conglomerate, sandstone, siltstone, Sandy Silt, coal dust, grouan is greater than 1%; The corrosion rate of the rock such as corrosion clay mineral (kaolinite, sodium bentonite, illite, chlorite), quartz, calcite, rhombspar, feldspar, conglomerate, sandstone, siltstone, Sandy Silt, coal dust, grouan is greater than 1%; Nanoporous seam expands 20%-100%; Anti-dilative 70% ~ 150%; Level of residue 0mg/L ~ 200mg/L; Resistance coefficient R
fbe greater than 10; Residual resistance factor RR
fbe greater than 6; The viscosity drop of 0.3%250 ten thousand molecular weight polyacrylamide is to below 4mPa.s; Imbibition oil displacement efficiency 5% ~ 20%; Amott-Harvey wetting index-0.3 ~ 0.5; Moisten contact angle 60 ° ~ 105 °; Ultra-low penetration core permeability improves 5% ~ 300%; Thief zone core flooding test efficiency improves 5% ~ 20%.Ultra-low penetration core flooding test efficiency improves 5% ~ 25%; Water sensitive index-0.01 ~-10; Acid-sensitive index-0.01 ~-10; N-80 steel disc 90 DEG C of static etch rate are less than 2g/ (m
2* h); 90 DEG C of Dynamic Corrosion speed are less than 10g/ (m
2* h).
Example 2. Carbonate Reservoir nanometer displacement agent NDAca
Feature: dissolve corrosion carbonatite; Froth quality is high.Tensio-active agent mainly uses negatively charged ion and nonionic surface active agent.
Formula: solvent+5% ~ 30% potential acid+10% ~ 30% intermediate wet agent of 10% ~ 40% foam+10% ~ 20% imbibition agent+10% ~ 30% dissolved carbon Carbonate Rocks.
The catalogue that 0.5% preparation of nano oil-displacing agent NDA prepares is designated as: circulate 20 minutes through truck-mounted blender, liquid distributing vehicle or high-duty pump, froth quality 30% ~ 75%; Transformation period 0.5min ~ 2min; The dissolution rate of the rock such as dissolve clays mineral (kaolinite, sodium bentonite, illite, chlorite), quartz, calcite, rhombspar, feldspar, conglomerate, sandstone, siltstone, Sandy Silt, coal dust, grouan is greater than 1%; The corrosion rate of the rock such as corrosion clay mineral (kaolinite, sodium bentonite, illite, chlorite), quartz, calcite, rhombspar, feldspar, conglomerate, sandstone, siltstone, Sandy Silt, coal dust, grouan is greater than 1%; Nanoporous seam expands 20%-100%; Anti-dilative 70% ~ 150%; Level of residue 0mg/L ~ 200mg/L; Resistance coefficient R
fbe greater than 10; Residual resistance factor RR
fbe greater than 6; Imbibition oil displacement efficiency 5% ~ 20%; Amott-Harvey wetting index-0.3 ~ 0.5; Moisten contact angle 60 ° ~ 105 °; Ultra-low penetration core permeability improves 5% ~ 300%; Thief zone core flooding test efficiency improves 5% ~ 20%.Ultra-low penetration core flooding test efficiency improves 5% ~ 25%; Water sensitive index-0.01 ~-10; Acid-sensitive index-0.01 ~-10; N-80 steel disc 90 DEG C of static etch rate are less than 2g/ (m
2* h); 90 DEG C of Dynamic Corrosion speed are less than 10g/ (m
2* h).
Example 3. shale oil oil reservoir nanometer displacement agent NDAsh
Feature: dissolve corrosion shale, imbibition, wettability are good.
The catalogue that 0.5% preparation of nano oil-displacing agent NDA prepares is designated as: circulate 20 minutes through truck-mounted blender, liquid distributing vehicle or high-duty pump, froth quality 30% ~ 70%; Transformation period 0.5min ~ 2min; The dissolution rate of the rock such as dissolve clays mineral (kaolinite, sodium bentonite, illite, chlorite), quartz, calcite, rhombspar, feldspar, conglomerate, sandstone, siltstone, Sandy Silt, coal dust, grouan is greater than 1%; The corrosion rate of the rock such as corrosion clay mineral (kaolinite, sodium bentonite, illite, chlorite), quartz, calcite, rhombspar, feldspar, conglomerate, sandstone, siltstone, Sandy Silt, coal dust, grouan is greater than 1%; Nanoporous seam expands 20%-100%; Anti-dilative 70% ~ 150%; Level of residue 0mg/L ~ 200mg/L; Imbibition oil displacement efficiency 5% ~ 20%; Amott-Harvey wetting index-0.3 ~ 0.5; Moisten contact angle 60 ° ~ 105 °; Ultra-low penetration core permeability improves 5% ~ 300%; Thief zone core flooding test efficiency improves 5% ~ 20%.Ultra-low penetration core flooding test efficiency improves 5% ~ 25%; Water sensitive index-0.01 ~-10; Acid-sensitive index-0.01 ~-10; N-80 steel disc 90 DEG C of static etch rate are less than 2g/ (m
2* h); 90 DEG C of Dynamic Corrosion speed are less than 10g/ (m
2* h).
Claims (9)
1. the compound method of nanometer displacement agent NDA, is characterized in that filling a prescription: solvent+5% ~ 30% potential acid+10% ~ 30% intermediate wet agent of rock is dissolved in 10% ~ 40% foam+10% ~ 30% dissolve polymer solvent+10% ~ 20% imbibition agent+10% ~ 30%.This formula ultimate principle is: remove the blocking that polymer injection is formed, foam air profile control reduces the seepage velocity of high seepage hole seam, suppress out high seepage hole slotted wall face and in surplus oil in low seepage hole seam, micron is displaced in imbibition, the partial adsorbates oil of nanoporous seam, lead solvent simultaneously, potential acid, neutral lubricant enters nanoaperture, solvent, cementing matter in potential acid dissolve corrosion nanoporous seam and slotted wall face, hole, can expand by nanoporous seam, again can nanoporous seam to become neutral water partially moistening wet, adsorbed oil desorb during nanoporous is stitched, improve the desorption rate of adsorbed oil simultaneously, velocity of diffusion, seepage velocity, improve surplus oil flow conductivity, the adsorbed oil of real realization both in suitability for industrialized production oil reservoir basement rock, again can industrialization extraction high seepage hole slotted wall face, in surplus oil in low seepage hole seam, increasing the storage is increased production.
2., according to compound method according to claim 1, it is characterized in that the nanometer displacement agent NDA of nanoporous seam is built in the water-soluble preparation by general principle, general objective, rock composition, profit composition, permeability grade, formation temperature, reservoir pressure, execution conditions, base-material.Nanometer displacement agent NDA prepare for extremely strong, system component and the consumption of nanometer displacement agent NDA have relativity.Preparation of nano oil-displacing agent NDA general principle is that froth quality is high, long half time, nanoporous seam amplification degree is maximum, anti-dilative is maximum, level of residue is minimum, resistance coefficient R
fgreatly, residual resistance factor RR
fgreatly, the viscosity of polyacrylamide reduces maximum, imbibition oil displacement efficiency is high, displacement oil displacement efficiency is high, Amott-Harvey wetting index is middle sex index, moisten contact angle is neutral angle, ultra-low penetration core permeability improves maximum, ultra-low penetration rock core displacement resistance-reducing yield is maximum, Thief zone core flooding test efficiency improves large, ultra-low penetration core flooding test efficiency improves large, water sensitive index is negative value, acid-sensitive index is negative value, Jia Min resistance reduces large, water seal resistance reduces large, hollow billet resistance drop low drop-out is large, static etch rate is little, Dynamic Corrosion speed is little.The catalogue that 0.5% nanometer displacement agent NDA prepares is designated as: circulate 20 minutes through truck-mounted blender, liquid distributing vehicle or high-duty pump, froth quality 30% ~ 70%; Transformation period 0.5min ~ 2min; The dissolution rate dissolving the rock such as corrosion clay mineral (kaolinite, sodium bentonite, illite, chlorite), quartz, calcite, rhombspar, feldspar, conglomerate, sandstone, siltstone, Sandy Silt, coal dust, grouan is greater than 1%; Nanoporous seam expands 20%-100%; Anti-dilative 70% ~ 150%; Level of residue 0mg/L ~ 200mg/L; Resistance coefficient R
fbe greater than 10; Residual resistance factor RR
fbe greater than 6; The viscosity drop of 0.3%250 ten thousand molecular weight polyacrylamide is to below 4mPa.s; Imbibition oil displacement efficiency 5% ~ 20%; Amott-Harvey wetting index-0.3 ~ 0.5; Moisten contact angle 60 ° ~ 105 °; Ultra-low penetration core permeability improves 5% ~ 300%; Thief zone core flooding test efficiency improves 5% ~ 20%.Ultra-low penetration core flooding test efficiency improves 5% ~ 25%; Water sensitive index-0.01 ~-10; Acid-sensitive index-0.01 ~-10; N-80 steel disc 90 DEG C of static etch rate are less than 2g/ (m
2* h); 90 DEG C of Dynamic Corrosion speed are less than 10g/ (m
2* h).
3., according to the compound method described in claim 1-2, it is characterized in that dissolve polymer, remove the blocking of polymer flooding formation.The base-material of dissolve polymer: the relative molecular mass such as Organic Alcohol, aldehyde, ether, phenol, ketone, ester, nitrogenous compound, sulfocompound, polyfunctional group, amine, acid, foam is less than 500 and solvent soluble in water.The system component of nanometer displacement agent NDA and consumption, according to the general principle of preparation of nano oil-displacing agent NDA and general objective, with lithological composition, formation temperature, reservoir pressure, execution conditions change, have relativity.By the viscosity drop of 0.3%250 ten thousand molecular weight polyacrylamide to the target adjustment system component of below 4mPa.s and consumption.
4., according to the compound method described in claim 1-3, it is characterized in that adopting foam and air to reduce the seepage velocity of high seepage hole seam.Foam-type is selected according to the electrostatic property of rock.General nonionic foam or zwitter-ion foam.The rock stratum negatively charged ion foam of positively charged; Electronegative rock stratum positively charged ion foam.By the formula rate of permeability grade determination foam.Formula rate=a* permeability grade+the b of foam.First determine that the minimum and maximum formula rate of foam substitutes into and obtain a, b, calculated the formula rate of foam by above formula.The base-material of whipping agent: positively charged ion whipping agent mainly C
8~ C
25glycosyl (chlorination, sulfuric acid, carbonic acid, phosphoric acid) quaternary ammonium salt; Nonionic lather agent has C
8~ C
25alkyl dimethylamine oxides is pressed, C
8~ C
25alkyl glycoside; Zwitter-ion whipping agent has C
8~ C
25alkyl dimethyl betaine, cocamidopropyl propyl amide hydroxy sulfo lycine, Cocamidopropyl ammonium oxide; Anion foaming agent has α-rare base sodium sulfonate, lauryl alcohol amber monoesters sodium sulfonate, Coconut Fatty Acid Monoethanolamide sulfosuccinic acid monoesters sodium sulfonate, coconut monoethanolamide mono sulfosuccinates.The foams object that 0.5% preparation of nano oil-displacing agent NDA prepares is: circulate 20 minutes through truck-mounted blender, liquid distributing vehicle or high-duty pump, froth quality 30% ~ 70%; Transformation period 0.5min ~ 2min.According to target adjustment system component and consumption.(referring to declaring patent: the acidic group visco-elasticity cleaning foam fracturing liquid compound method of building nanoporous seam).
5., according to the compound method described in claim 1-4, it is characterized in that imbibition agent is easy to enter nanoporous and stitches and expand nanoaperture; The base-material of imbibition agent: Repone K, potassium sulfate, polyoxyethylene, alcohol ether sulphates salt, alkyl sodium sulfonate, sodium alkyl sulfate, sec-octyl alcohol Soxylat A 25-7, polyoxyethylene (propylene) alkyl ethoxylated sulfuric acid, polyoxyethylene (propylene) alkyl alcohol ether sulphonate, alkylaryl oxyethyl group sulfonate phenol, alkylaryl sulphonate, alkylaryl oxyethyl group sulfonate, sulfate, alkyl glycoside, sulfonated petro-leum, Gemini surface active agent FOS, sodium lignosulfonate, Sodium dodecylbenzene sulfonate, glycerol.The imbibition target that 0.5% preparation of nano oil-displacing agent NDA prepares is: circulate 20 minutes through truck-mounted blender, liquid distributing vehicle or high-duty pump, imbibition 20 hours oil displacement efficiencies 5% ~ 20%.According to target adjustment system component and consumption.
6., according to the compound method described in claim 1-5, the solvent that it is characterized in that dissolving rock expands nanoporous seam.Dissolve the base-material of the solvent of rock: the relative molecular masses such as hydrocarbon, halohydrocarbon, alcohol, phenol, ether, ketone, ester, nitrogenous compound, sulfocompound, polyfunctional group, tensio-active agent are less than 500 and solvent soluble in water.It is characterized in that the performance of filling a prescription has: the rock such as dissolve clays mineral (kaolinite, sodium bentonite, illite, chlorite), quartz, calcite, rhombspar, feldspar, conglomerate, sandstone, siltstone, Sandy Silt, coal dust, grouan.The solubilized target that 0.5% preparation of nano oil-displacing agent NDA prepares (non-foam) is: circulate 20 minutes through truck-mounted blender, liquid distributing vehicle or high-duty pump, the dissolution rate of the rock such as dissolve clays mineral (kaolinite, sodium bentonite, illite, chlorite), quartz, calcite, rhombspar, feldspar, conglomerate, sandstone, siltstone, Sandy Silt, coal dust, grouan is greater than 1%; Nanoporous seam expands 10%-30%; Rate of permeation improves 1% ~ 10%; Water sensitive index-0.1 ~-10; Acid-sensitive index-0.1 ~-10; Jia Min resistance reduces by 2% ~ 15%; Water seal resistance reduces by 2% ~ 15%; Hollow billet resistance reduces by 2% ~ 15%; Anti-dilative 70% ~ 150%.It is characterized in that filling a prescription the composition of solvent and consumption according to the dissolving principle of preparation of nano oil-displacing agent NDA and solubilized target, with lithological composition, formation temperature, reservoir pressure, execution conditions change, there is relativity.
(referring to the clean dissolving pressure break liquid making method declaring patent dissolving petrographic formation nanoporous seam.)。
7., according to the compound method described in claim 1-6, it is characterized in that potential acid is built in fine and close basement rock, expansion nanoporous seam, micron openings seam, improve adsorbed oil desorption rate.The base-material of potential acid: low-carbon alcohol, urotropine, water soluble salt of ammonia, organic amine; Catalyzer Cr
2o
3, V
2o
5, MoO
3, Pa, Al
2o
3, acetate, propionic salt, vitriol.Stratum under formation conditions, is generated mineral acid hydrochloric acid, hydrofluoric acid, sulfuric acid, phosphoric acid, carbonic acid as wisdom Reaktionsofen by these potential acidic group material and a small amount of catalyzer; Organic acid formic acid, acetic acid, butyric acid, propionic acid etc.The potential acid-soluble erosion target that 0.5% preparation of nano oil-displacing agent NDA prepares (non-foam) is: under formation temperature and pressure, after 20 hours, the corrosion rate of the rock such as corrosion clay mineral (kaolinite, sodium bentonite, illite, chlorite), quartz, calcite, rhombspar, feldspar, conglomerate, sandstone, siltstone, Sandy Silt, coal dust, grouan is greater than 1%; Nanoporous seam expands 10%-20%; Rate of permeation improves 1% ~ 10%.It is characterized in that filling a prescription the composition of potential acid and consumption according to the corrosion principle of preparation of nano oil-displacing agent NDA and corrosion target, with lithological composition, formation temperature, reservoir pressure, execution conditions change, there is relativity.
(referring to declaring patent: the stratum self-generating building nanoporous seam cleans potential sour compound method.)。
8. according to the compound method described in claim 1-7, it is characterized in that wetting agent changes the wettability of rock, rock is become the inclined water-wet of intermediate wet, make adsorbed oil depart from rock wall, dispersed oil droplets is collected and is concentrated into oil stream.The base-material of wetting agent: C
16~ C
22single long-chain (chlorination, sulfuric acid, carbonic acid, phosphoric acid) quaternary ammonium salt, C
16~ C
22two long-chain (chlorination, sulfuric acid, carbonic acid, phosphoric acid) quaternary ammonium salt, C
16~ C
22three long-chains (chlorination, sulfuric acid, carbonic acid, phosphoric acid) quaternary ammonium salt, tetrahydroglyoxaline (chlorination, sulfuric acid, carbonic acid, phosphoric acid) quaternary ammonium salt, pyridine (chlorination, sulfuric acid, carbonic acid, phosphoric acid) quaternary ammonium salt, polyxyethylated alkylphenol, fatty alcohol-polyoxyethylene ether, disecoctylmaleate sodium sulfonate, ethylene glycol monomethyl ether, 1,2-dibutyl naphthalene-6-sodium sulfonate, white oil.The wetting target that 0.5% preparation of nano oil-displacing agent NDA prepares is: Amott-Harvey wetting index-0.3 ~ 0.5; Moisten contact angle 60 ° ~ 105 °.It is characterized in that the composition of formulation humectant and consumption are according to the wetting principle of preparation of nano oil-displacing agent NDA and wetting target, with lithological composition, formation temperature, reservoir pressure, execution conditions change, have relativity.
9., according to the compound method described in claim 1-8, it is characterized in that adopting the optimum injection method of nanometer displacement agent.First, first the nanometer reservoir reconstruction of oil and water well is carried out respectively: clean fracturing liquid (see declaring patent: the clean dissolving pressure break liquid making method dissolving petrographic formation nanoporous seam), clean retarded acid (see declaring patent: the clean retarded acid compound method of rock nanoporous seam do not built by replace tubes post) and the stratum self-generating of dissolving of note cleans potential acid (see declaring patent: the stratum self-generating building nanoporous seam cleans potential sour compound method), injection rate 300m
3~ 2000m
3; The second, then at water injection well note nanometer displacement agent.Turn to target to improve the maximum optimum of recovery ratio, note nanometer displacement agent best Variable Composition (0.1% ~ 1%) variable-flow slug formula is injected.3rd, must district of the company of accomplishing nanometer reservoir reconstruction in flakes, connect district and use the continuous displacement of reservoir oil of nanometer displacement agent in flakes, guarantee that adsorbed oil entirety improves volume desorption rate, guarantee overall surplus oil extraction.4th, composition, the consumption of the formula of each slug formula must adapt to actual needs, change in good time.
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| CN111607372A (en) * | 2020-05-26 | 2020-09-01 | 新疆新易通石油科技有限公司 | Biological nano preparation for thickened oil recovery and preparation method and application thereof |
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| CN107216863A (en) * | 2017-06-01 | 2017-09-29 | 中国石油天然气股份有限公司勘探开发研究院廊坊分院 | A kind of imbibition agent recovered the oil applied to low-permeability oil deposit imbibition and preparation method thereof |
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| CN110157404B (en) * | 2019-05-30 | 2020-11-13 | 东北石油大学 | Ecological environment-friendly oil field displacement of reservoir oil system |
| CN111607372A (en) * | 2020-05-26 | 2020-09-01 | 新疆新易通石油科技有限公司 | Biological nano preparation for thickened oil recovery and preparation method and application thereof |
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| CN112102487A (en) * | 2020-09-17 | 2020-12-18 | 西南石油大学 | Unconventional reservoir three-dimensional permeability determination method based on multiple mixed fractal |
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