CN107686722A - A kind of oil resistant foam flooding finish and preparation method thereof, application - Google Patents
A kind of oil resistant foam flooding finish and preparation method thereof, application Download PDFInfo
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- CN107686722A CN107686722A CN201710592748.9A CN201710592748A CN107686722A CN 107686722 A CN107686722 A CN 107686722A CN 201710592748 A CN201710592748 A CN 201710592748A CN 107686722 A CN107686722 A CN 107686722A
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
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Abstract
The invention provides a kind of oil resistant foam flooding finish and preparation method thereof, application, on the basis of oil resistant foam flooding finish gross mass, the oil resistant foam flooding finish is made up of the raw material of following mass percent：Polymer 0.08%~0.15%, inorganic additive 0.2%~0.4%, anion surfactant 0.1%~0.3%, surplus are water.The oil resistant foam flooding finish of the present invention has the advantages of foaming capacity is strong, and grease resistance is good；Cost of material is low, safe, can avoid polluting stratum, more green；It is easy to operate applied to tertiary oil recovery, it can effectively strengthen the oil resistivity of air foam or nitrogen foam, usual foam all defoams when crude content is more than 30%, and for the foam of the invention when crude content is less than 50%, half-life period can be more than 60min.
Description
Technical field
The present invention relates to technical field of oilfield tertiary oil recovery, more particularly to the oil resistant that a kind of stability is good, shut-off capacity is high
Foam flooding finish and preparation method thereof, application.
Background technology
East China old filed majority has been enter into development late stage, and development contradiction is outstanding day by day, at present polymer flooding and binary
Drive is more ripe tertiary oil recovery technology, but the problem of be faced with high-quality three and adopt scarcity of resources, foam flooding is good due to its
Good sealing characteristics and the selectivity to profit, it is considered to be a rising tertiary oil recovery mode.Aerated fluid
Application study in oil field has the history of more than 50 years, as an important development direction in oil-gas field development.In recent years
Come, it is also very unripe although China Petroleum have accumulated some experiences in terms of aerated fluid application technology.
Foam flooding is resistance coefficient highest technology in the raising recovery ratio method tested at present.Aerated fluid have compared with
High apparent viscosity and preferable sealing characteristics, foam act not only as blocking agent, improve swept volume, improve water injection profile, it
It is also used as the oil displacement efficiency that oil displacement agent improves non-homogeneous pay.Foam by Jamin effect and is detained trapping production in the earth formation
Raw flow resistance, in the presence that the higher region foam of water saturation can be stablized, and larger resistance is produced, make to be subsequently implanted into
Fluid occurs liquid stream and turned, and expands swept volume, but runs into after residual oil because oil water interfacial tension is much smaller than gas-liquid surface tension force,
According to energy minimum principle, the surfactant molecule being distributed in originally on gas-liquid surface film can be transferred to oil-water interfaces, cause
Density of foaming agent on gas-liquid surface reduces, and the stability of bubble declines, and is difficult to form foam again.Therefore oil resistant is needed
The strong foaming system of property just can guarantee that the effect of foam flooding.
A kind of " foam flooding finish " is disclosed in Chinese patent literature, its notification number is CN102766448A, the invention
Foam flooding finish includes Alkylbenzensulfonate, tetrakis hydroxymetyl phosphonium sulfuric, surfactant, Tween-20 and water, has high surface
Activity, without outer adding assistant, it is possible to oil water interfacial tension is greatly lowered.But the invention is higher from cost of material, no
Easy industrialization.
The content of the invention
The present invention is in order to overcome the problem of existing foam flooding finish oil resistivity is poor, stability is low, there is provided a kind of stability
Good, the oil resistant foam flooding finish that shut-off capacity is high, green.
Present invention also offers a kind of preparation method of the simple oil resistant foam flooding finish of technique.
Another goal of the invention of the present invention is application of the oil resistant foam flooding finish in oil reservoir tertiary oil recovery.
To achieve these goals, the present invention uses following technical scheme：
A kind of oil resistant foam flooding finish, on the basis of oil resistant foam flooding finish gross mass, the oil resistant foam flooding finish is by following
The raw material of mass percent is made：Polymer 0.08%~0.15%, inorganic additive 0.2%~0.4%, anionic surface are lived
Property agent 0.1%~0.3%, surplus is water.
The synergetical principle of oil resistant foam flooding finish each component formula of the present invention is as follows：Polymer：Foam can be increased
Thickness of liquid film, and then strengthen the stability of foam, but polymer concentration it is excessive when, the foam ability of expanding foam solution can be influenceed,
The absorption of foaming agent in the earth formation can be lowered simultaneously, controlled preferable in 0.08%~0.15% effect；Inorganic additive：
Can be moisturized sub cohesive force, increased the oil-water interfaces of foaming agent solution, reduced air water surface tension, the two more adjunction
Closely, the stability of foam is improved；Anion surfactant：The main reason for foam oil resistivity difference is due to oil water interfacial tension
Much smaller than air water surface tension, after foam meets oil, surfactant can shift from oil-water interfaces to air water surface automatically, cause to steep
Foam bad stability, approached using oil water interfacial tension and air water surface tension, or the anionic surface in the same order of magnitude
The foaming capacity of activating agent is preferable.Inorganic additive in inventive formulation system compounds with the anion surfactant
Afterwards, the oil-water interfaces of foaming agent solution can effectively be increased, so as to reduce air water surface tension.
Preferably, the polymer is partially hydrolyzed polyacrylamide (PHPA), the molecule of the partially hydrolyzed polyacrylamide (PHPA)
Measure as 1000~2000.
Partially hydrolyzed polyacrylamide (PHPA) used in the present invention is the polymeric system with viscoelasticity, it is possible to increase the displacement of reservoir oil is imitated
Rate, the mechanism of reduction residual oil saturation are acted on based on viscoelastic fluid " draw, drag ", with the increasing of relative molecular mass
Add, system viscosity reduced rate constantly reduces, preferable from the partially hydrolyzed polyacrylamide (PHPA) effect that molecular weight is 1000~2000.
In addition, the defects of can effectively overcoming traditional oil displacement agent to be polluted using alkali to stratum from partially hydrolyzed polyacrylamide (PHPA),
Therefore the oil resistant foam flooding finish of the present invention obtains safe, more green.
Preferably, the inorganic additive is disodium hydrogen phosphate.
Preferably, the anion surfactant is selected from lauryl sodium sulfate, dodecyl sodium sulfate, dodecane
Base benzene sulfonic acid sodium salt, low molecule petroleum sulfonate, alpha-alkene sulfonate, polyoxyethylene alkyl ether sulfuric acid ester salt, polyoxypropylene alkyl
One or more in ether sulfuric acid ester salt, fatty acid soaps, spent pulping liquor concentrate, sulfurous acid alcohol effluent.Above-mentioned anion
The oil water interfacial tension of surfactant approaches with air water surface tension, or in the same order of magnitude, and foaming capacity is good,
Therefore preferable oil resistant foaming agent can be used as.
Disodium hydrogen phosphate is with after described anion surfactant compounding, can effectively increase profit circle of foaming agent solution
Face, air water surface tension is reduced, while disodium hydrogen phosphate is green, and stratum will not be damaged, and cost is low, has
Certain price advantage.
A kind of preparation method of oil resistant foam flooding finish, comprises the following steps：
(1) raw material is weighed according to said ratio, the polymer mother liquor that configuration volumetric concentration is 4500~5000mg/L, stand 2~
4h is stand-by；
(2) polymer mother liquor in appropriate step (1) is measured, is diluted to the polymer mesh that volumetric concentration is 800~1500mg/L
Liquid；When the concentration of polymer is excessive, the foam ability of expanding foam solution can be influenceed, controls and has in the range of 800~1500mg/L
There is preferable foaming capacity, while the absorption of foaming agent in the earth formation can be lowered, it is green；
(3) inorganic additive is first added in the polymer purpose liquid into step (2), then adds anion surfactant, with 100
2~3h is stirred under~200r/min speed normal temperature, oil resistant foam flooding finish is made.
The process regulation of the preparation method of oil resistant foam flooding finish of the present invention follows the following mechanism of action：With polymerization
The increase of objects system concentration and relative molecular mass, the oil displacement efficiency of system improve；High concentration, super high molecular weight polymer system
Viscosity reduced with the increase of time of repose, influence of 45 DEG C of ageing times to system viscosity is gradually reduced.The present invention does not have
Directly polymer purpose liquid of the configuration with aimed concn, but use and first configure highly concentrated polymer mother liquor, during by one section
Between standing after be diluted after use, the stability enhancing of obtained oil resistant foam flooding finish can be made, performance is good, prevents old
Change, so as to have higher oil displacement efficiency.
A kind of application of oil resistant foam flooding finish, it is 30~60 DEG C for temperature, formation water salinity is less than 5000mg/L,
Permeability is 800md~5000md oil reservoir tertiary oil recovery.
Therefore, the present invention has the advantages that：
(1) oil resistant foam flooding finish of the invention has the advantages of foaming capacity is strong, and grease resistance is good；
(2) oil resistant foam flooding finish cost of material of the invention is low, safe, can avoid polluting stratum, more green
Colour circle is protected；
(3) oil resistant foam flooding finish of the invention can be applied to tertiary oil recovery, easy to operate, can effectively strengthen air foam or
The oil resistivity of nitrogen foam, usual foam all defoam when crude content is more than 30%, and the foam of the invention contains in crude oil
When amount is less than 50%, half-life period can be more than 60min.
Embodiment
Below by specific embodiment, technical scheme is described in further detail.
In the present invention, if not refering in particular to, all devices and raw material are commercially available or the industry is conventional, following
Method in embodiment, it is this area conventional method unless otherwise instructed.
Embodiment 1
(1) raw material is weighed according to following proportionings：0.08% partially hydrolyzed polyacrylamide (PHPA) (molecular weight is 1000~2000),
0.2% disodium hydrogen phosphate, 0.1% polyoxyethylene alkyl ether sulfuric acid ester salt, surplus is water；Configuring volumetric concentration is
4500mg/L polymer mother liquor, it is stand-by to stand 2h；
(2) polymer mother liquor in appropriate step (1) is measured, is diluted to the polymer purpose liquid that volumetric concentration is 800mg/L；
(3) disodium hydrogen phosphate is first added in the polymer purpose liquid into step (2), then adds polyoxyethylene alkyl ether sulfuric acid ester
Salt, to stir 2h under 100r/min speed normal temperature, oil resistant foam flooding finish is made.
It is 30 DEG C, formation water salinity 3000mg/L that the oil resistant foam flooding finish of the present embodiment is used for into temperature, permeability
For 800md oil reservoir tertiary oil recovery：Oil resistant foam flooding finish 100mL is taken, above-mentioned crude oil 100mL is added, is stirred in warring
Mix in device, 1000r/min, stir 1min, at room temperature, measure foam volume is 298mL, half-life period 61min.
Embodiment 2
(1) raw material is weighed according to following proportionings：0.15% partially hydrolyzed polyacrylamide (PHPA) (molecular weight is 1000~2000),
0.4% disodium hydrogen phosphate, 0.3% anion surfactant (alpha-alkene sulfonate 0.05%, polyoxyethylene alkyl ether sulphur
Sour fat salt 0.01%, polyoxypropylene alkyl ether sulfuric acid ester salt 0.08%, fatty acid soaps 0.02%, spent pulping liquor concentrate
0.05%th, sulfurous acid alcohol effluent 0.09%), surplus is water；The polymer mother liquor that volumetric concentration is 5000mg/L is configured, is stood
4h is stand-by；
(2) polymer mother liquor in appropriate step (1) is measured, is diluted to the polymer purpose liquid that volumetric concentration is 1500mg/L；
(3) disodium hydrogen phosphate is first added in the polymer purpose liquid into step (2), then adds polyoxyethylene alkyl ether sulfuric acid ester
Salt, to stir 3h under 200r/min speed normal temperature, oil resistant foam flooding finish is made.
It is 60 DEG C, formation water salinity 4000mg/L that the oil resistant foam flooding finish of the present embodiment is used for into temperature, permeability
For 5000md oil reservoir tertiary oil recovery：Oil resistant foam flooding finish 100mL is taken, above-mentioned crude oil 100mL is added, in warring
In agitator, 1000r/min, 1min is stirred, at room temperature, measure foam volume is 300mL, half-life period 65min.
Embodiment 3
(1) raw material is weighed according to following proportionings：0.1% partially hydrolyzed polyacrylamide (PHPA) (molecular weight is 1000~2000),
0.3% disodium hydrogen phosphate, 0.2% anion surfactant (dodecyl sodium sulfate 0.08%, DBSA
Sodium 0.025%, low molecule petroleum sulfonate 0.075%, fatty acid soaps 0.02%), surplus is water；Configuring volumetric concentration is
4600mg/L polymer mother liquor, it is stand-by to stand 3h；
(2) polymer mother liquor in appropriate step (1) is measured, is diluted to the polymer purpose liquid that volumetric concentration is 1000mg/L；
(3) disodium hydrogen phosphate is first added in the polymer purpose liquid into step (2), then adds polyoxyethylene alkyl ether sulfuric acid ester
Salt, to stir 2.5h under 150r/min speed normal temperature, oil resistant foam flooding finish is made.
It is 40 DEG C, formation water salinity 4500mg/L that the oil resistant foam flooding finish of the present embodiment is used for into temperature, permeability
For 2000md oil reservoir tertiary oil recovery：Oil resistant foam flooding finish 100mL is taken, adds above-mentioned crude oil 100mL, is stirred in warring
In device, 1000r/min, 1min is stirred, at room temperature, measure foam volume is 320mL, half-life period 77min.
Embodiment 4
(1) raw material is weighed according to following proportionings：0.12% partially hydrolyzed polyacrylamide (PHPA) (molecular weight is 1000~2000),
0.35% disodium hydrogen phosphate, 0.25% anion surfactant (lauryl sodium sulfate, dodecyl sodium sulfate, ten
Dialkyl benzene sulfonic acids sodium, low molecule petroleum sulfonate, alpha-alkene sulfonate, polyoxyethylene alkyl ether sulfuric acid ester salt, polyoxypropylene
Alkyl ether sulfate fat salt, fatty acid soaps, spent pulping liquor concentrate, sulfurous acid alcohol effluent), surplus is water；Configure volumetric concentration
For 4800mg/L polymer mother liquor, it is stand-by to stand 2.5h；
(2) polymer mother liquor in appropriate step (1) is measured, is diluted to the polymer purpose liquid that volumetric concentration is 1200mg/L；
(3) disodium hydrogen phosphate is first added in the polymer purpose liquid into step (2), then adds polyoxyethylene alkyl ether sulfuric acid ester
Salt, to stir 1.5h under 180r/min speed normal temperature, oil resistant foam flooding finish is made.
It is 50 DEG C, formation water salinity 3500mg/L that the oil resistant foam flooding finish of the present embodiment is used for into temperature, permeability
For 4000md oil reservoir tertiary oil recovery：Oil resistant foam flooding finish 100mL is taken, adds above-mentioned crude oil 100mL, is stirred in warring
In device, 1000r/min, 1min is stirred, at room temperature, measure foam volume is 320mL, half-life period 74min.
Comparative example
A kind of usual foam oil displacement agent, on the basis of foam flooding finish gross mass, it is mixed by the raw material of following mass percent
Compounding is made：Anion surfactant 0.25% (fluorine-carbon sufactant), partially hydrolyzed polyacrylamide (PHPA) (molecule
Measure as 1000~2000, concentration 1200mg/L) 0.12%, surplus is water.
It is 50 DEG C, formation water salinity 3500mg/L that the usual foam oil displacement agent of this comparative example is used for into temperature, permeability
For 4000md oil reservoir tertiary oil recovery：Oil resistant foam flooding finish 100mL is taken, adds above-mentioned crude oil 100mL, is stirred in warring
In device, 1000r/min, 1min is stirred, at room temperature, measure half-life period is 3.5min.
Oil resistivity test, under the conditions of different oil-containings, foaming system are carried out to embodiment 1-4 and the oil displacement agent of comparative example
The half-life period measurement result of caused resistance factor and output foam in rock core, evaluate the fuel tolerance capability of foam.
Continuous mode is：
Step 1：The fill out sand tube or rock core (permeability 800-10000mD) that 1m is grown, and crude oil and water are put into insulating box,
Can be 30-50 DEG C of scope by the temperature setting of insulating box, constant temperature places 4h.According to volume it is 1 by crude oil and water:1 ratio note
Enter into the fill out sand tube or rock core of 1m length, reach poised state, pressure P when record balances, porous media oil saturation is
50%；
Step 2：Configure foaming agent water solution, be put into the same constant temperature 4h of insulating box, by air or nitrogen and foaming agent solution according to
Volume ratio is 1:1 is injected into the 10cm of 1m porous medias front end connection rock core or fill out sand tube (foam maker) simultaneously, has treated
After the foam generation of even stabilization (or after pressure is constant), foam maker is connected with the porous media that oil saturation is 50%, i.e.,
Foam is injected into the porous media of oil-containing, records pressure change；
Step 3：It is after pressure stabilisation, pressure PfCalculate resistance factor, resistance factor PfWith P ratio, if the ratio is big
In 20, then prove that foam has preferable oil resistivity；The foam 5ml of port of export output is collected simultaneously, and record output foam partly declines
Phase, experimental result are shown in Table 1.
The fuel tolerance capability measurement result of the different oil displacement agent output foams of table 1.
| Oil displacement agent | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Comparative example |
| Resistance factor | 25 | 22 | 28 | 30 | 3 |
| Half-life period, min | 61 | 65 | 77 | 74 | 3.5 |
Embodiment 1-4 oil resistant foam flooding finish drives relative to the usual foam of comparative example it can be seen from the measurement result of table 1
Finish output foam has preferable oil resistivity, can make have preferable stability during foam flooding, the energy under the conditions of oil-containing
Form effective shut-off capacity.
The oil resistant foam flooding finish of the present invention has the advantages of foaming capacity is strong, and grease resistance is good；Cost of material is low, security
Height, it can avoid polluting stratum, it is more green；It is easy to operate applied to tertiary oil recovery, it can effectively strengthen air
The oil resistivity of foam or nitrogen foam, usual foam all defoam when crude content is more than 30%, and the foam of the invention exists
When crude content is less than 50%, half-life period can be more than 60min.
Presently preferred embodiments of the present invention is the foregoing is only, any formal limitation not is made to the present invention, not surpassed
There are other variants and remodeling on the premise of going out the technical scheme described in claim.
Claims (6)
- A kind of 1. oil resistant foam flooding finish, it is characterised in that on the basis of oil resistant foam flooding finish gross mass, the resistance to oil whip Oil displacement agent is made up of the raw material of following mass percent：Polymer 0.08%~0.15%, inorganic additive 0.2%~0.4%, Anion surfactant 0.1%~0.3%, surplus are water.
- 2. a kind of oil resistant foam flooding finish according to claim 1, it is characterised in that the polymer gathers for partial hydrolysis Acrylamide, the molecular weight of the partially hydrolyzed polyacrylamide (PHPA) is 1000~2000.
- 3. a kind of oil resistant foam flooding finish according to claim 1, it is characterised in that the inorganic additive is phosphoric acid hydrogen Disodium.
- A kind of 4. oil resistant foam flooding finish according to claim 1, it is characterised in that the anion surfactant choosing From lauryl sodium sulfate, dodecyl sodium sulfate, neopelex, low molecule petroleum sulfonate, alpha-olefin sulfonic acid Salt, polyoxyethylene alkyl ether sulfuric acid ester salt, polyoxypropylene alkyl ether sulfuric acid ester salt, fatty acid soaps, spent pulping liquor concentrate, sulfurous One or more in sour alcohol effluent.
- A kind of 5. preparation method of oil resistant foam flooding finish as described in Claims 1 to 4 is any, it is characterised in that including with Lower step：(1) raw material is weighed according to said ratio, the polymer mother liquor that configuration volumetric concentration is 4500~5000mg/L, stand 2~ 4h is stand-by；(2) polymer mother liquor in appropriate step (1) is measured, is diluted to the polymer mesh that volumetric concentration is 800~1500mg/L Liquid；(3) inorganic additive is first added in the polymer purpose liquid into step (2), then adds anion surfactant, with 100 2~3h is stirred under~200r/min speed normal temperature, oil resistant foam flooding finish is made.
- 6. the application of a kind of oil resistant foam flooding finish as described in Claims 1 to 4 is any, it is characterised in that be for temperature 30~60 DEG C, formation water salinity is less than 5000mg/L, and permeability is 800md~5000md oil reservoir tertiary oil recovery.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110144202A (en) * | 2019-06-14 | 2019-08-20 | 长江大学 | A kind of long-acting foam of high temperature and pressure transfer drive and preparation method thereof |
| CN110699057A (en) * | 2019-09-27 | 2020-01-17 | 中国石油化工股份有限公司 | Temperature-resistant high-strength foam system with synergistic lamellar nano-particles and preparation method thereof |
| CN111088026A (en) * | 2019-11-20 | 2020-05-01 | 中国石油天然气股份有限公司 | Foaming agent and preparation method and application thereof |
| CN113216917A (en) * | 2021-06-17 | 2021-08-06 | 中国石油大学(华东) | Method for controlling nitrogen channeling in oil reservoir nitrogen injection huff-puff exploitation process |
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| CN106753307A (en) * | 2016-11-10 | 2017-05-31 | 东北石油大学 | A kind of heat-resistant salt-resistant blowing agent system and preparation method for heavy crude reservoir thermal recovery |
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| CN110699057A (en) * | 2019-09-27 | 2020-01-17 | 中国石油化工股份有限公司 | Temperature-resistant high-strength foam system with synergistic lamellar nano-particles and preparation method thereof |
| CN111088026A (en) * | 2019-11-20 | 2020-05-01 | 中国石油天然气股份有限公司 | Foaming agent and preparation method and application thereof |
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| CN113216917A (en) * | 2021-06-17 | 2021-08-06 | 中国石油大学(华东) | Method for controlling nitrogen channeling in oil reservoir nitrogen injection huff-puff exploitation process |
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Application publication date: 20180213 |