CN109913193B - Pressure-reducing and injection-increasing agent for water injection well of low-permeability oil reservoir and preparation method thereof - Google Patents
Pressure-reducing and injection-increasing agent for water injection well of low-permeability oil reservoir and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of oilfield flooding development, and particularly relates to a pressure-reducing and injection-increasing agent for a low-permeability reservoir water injection well and a preparation method thereof; the blood pressure reducing and injection increasing agent comprises the following components in parts by weight: 50-55 parts of dehydroabietic surfactant, 7-11 parts of betaine amphoteric surfactant, 18-22 parts of cationic surfactant, 5-8 parts of cetyl alcohol and 100 parts of ethanol. The pressure-reducing injection-increasing agent can remove an oil film, wherein a cation component takes water as a transfer medium to form a molecular film on the surface of a rock, so that clay is stabilized, the wettability of the surface of the rock is improved, and the water injection friction and the capillary resistance are reduced, thereby achieving the purposes of reducing the water injection pressure, improving the water injection capacity of a low-permeability oil reservoir and improving the water drive efficiency.
Description
Technical Field
The invention belongs to the technical field of oilfield water injection development, and particularly relates to a pressure-reducing and injection-increasing agent for a low-permeability reservoir water injection well and a preparation method thereof.
Background
The low permeability reservoir development mode is mainly water flooding, but membrane-shaped or oil-drop-shaped residual oil still exists after the water flooding. The presence of these residual oils reduces the water phase percolation path, resulting in increased injection pressure, decreased injection capacity, and consequently, water flooding recovery. At present, the main approach for solving the development difficulty of low-permeability oil reservoirs is to reduce water injection pressure, and related inventions are disclosed.
In the chinese patent application with publication No. CN104892855, a surfactant PAFB for oil recovery in low permeability reservoir is disclosed, and trace PAFB can significantly increase the contact angle of water on the rock surface, improve the relative permeability of water phase, and reduce pressure and increase injection. CN106281288 discloses a pressure-reducing injection-increasing agent for a low permeability reservoir water injection well: 30-35% of dioctylalkyl dimethyl ammonium chloride, 3-7% of fluorocarbon surfactant, 3-5% of nonionic surfactant, 5-10% of ethylene diamine tetramethylene sodium phosphonate, 2-5% of dimethyl ketoxime and 38-57% of water; the pressure-reducing injection-increasing agent takes an aqueous solution as a transfer medium to deposit and form an ultrathin molecular film on the surface of rock, has the effects of changing the core wettability and preventing clay from swelling, can effectively prevent the influence of corrosion products, scaling, bacteria and the like of injected water on the formation porosity, and reduces the water injection pressure.
The Chinese invention with the publication number CN104371689 discloses a compound system mainly for reducing interfacial tension: 10 to 33 percent of amphoteric surfactant, 7 to 23 percent of nonionic surfactant, 1 to 4 percent of anionic surfactant and the balance of water, and can ensure that the oil-water interfacial tension reaches 10 in a short time-4mN/m or lower, can be used for reducing pressure and increasing injection and reducing viscosity of thick oil. In Chinese patent publications CN102965091, CN105154051, CN101538461 and CN106467732, a compound system mainly for reducing interfacial tension is disclosed, which has the effects of anti-swelling, sterilization and scale inhibition. CN102965091 discloses a pressure-reducing injection-increasing agent for ultra-low permeability oil field: A. gemini surfactant (cationic type) 0.0320% -0.0850%; B. 0.0060 to 0.0200 percent of nonionic surfactant (lauric acid diethanolamide); C. 0.0016 to 0.0050 percent of scale inhibitor (organic phosphonic acid scale inhibitor); D. 0.0004 to 0.002 percent of iron ion stabilizer (compound of hydroxycarboxylic acid and aminocarboxylic acid); E. the balance of water; has the advantages of anti-expansion, reducing the tension of oil-water interface and preventing CaCO3、BaSO4、Fe(OH)3Plugging the formation. CN105154051A surfactant composition for lowering blood pressure and increasing injection comprises: 0.05-0.2 part of amphoteric surfactant, 0.05-0.15 part of clay stabilizer, 0.005-0.012 part of antiscaling agent and 100 parts of water; by changing wettability, the oil-water interfacial tension is reduced to 10-1-10-2mN/m, and simultaneously can prevent clay swelling and inhibit the damage of carbonate precipitates such as calcium carbonate and the like to the stratum. CN101538461 provides a pressure-reducing injection-increasing agent for water injection well: lauric acid monoethanolamide: 30-42 parts; l-valine benzyl ester p-toluenesulfonate: 2.5-4.5 parts; c8-10 alkyl glucoside: 5.5-7.5 parts; sodium nitrite; 0.5-1.0 part; a vitamin A; : 0.5-1 part; fluorocarbon surfactant FN-2: 0.05-0.1 part; methanol: 25-35 parts; water: 15-35 parts; can reduce the oil-water interfacial tension, change the wettability of rock and inhibit the clay expansion. CN106467732 discloses a high temperature and high salt resistant hypotonic oil reservoir pressure-reducing injection-increasing active system and a preparation method thereof, wherein the active system comprises: a. 31-33 parts of composite alkylamido polyoxyethylene phosphate surfactant, 13-14 parts of bis-succinate disulfonate surfactant, 1.2-1.3 parts of composite organic alcohol substance, 5.5-5.7 parts of d-organic anti-swelling agent and the balance of e-water; can reduce the oil-water interfacial tension and improve the wettability of the surface of the rock pore.
In summary, the currently disclosed patent mainly aims to reduce the oil-water interfacial tension, the capillary resistance is reduced after the oil-water interfacial tension is reduced, and oil drops blocked in the croup are easy to remove, but the reduction of the interfacial tension has no special effect on an oil film adhered to the wall surface of a rock, and on the other hand, finger advance is easy to form due to the reduction of the interfacial tension, and the removal of the film-shaped adhered oil is more difficult.
Disclosure of Invention
The invention mainly aims to solve the defects of the prior art, and one aim of the invention is to provide a pressure-reducing injection-increasing agent for a low-permeability oil reservoir water injection well, and the other aim of the invention is to provide a preparation method of the pressure-reducing injection-increasing agent for the low-permeability oil reservoir water injection well. The pressure-reducing injection-increasing agent can remove an oil film, wherein a cation component takes water as a transfer medium to form a molecular film on the surface of a rock, so that clay is stabilized, the wettability of the surface of the rock is improved, and the water injection friction and the capillary resistance are reduced, thereby achieving the purposes of reducing the water injection pressure, improving the water injection capacity of a low-permeability oil reservoir and improving the water drive efficiency.
One of the purposes of the invention can be realized by the following technical scheme:
a pressure-reducing and injection-increasing agent for a water injection well of a low-permeability oil reservoir comprises the following components in parts by weight: 50-55 parts of dehydroabietic surfactant, 7-11 parts of betaine amphoteric surfactant, 18-22 parts of cationic surfactant, 5-8 parts of cetyl alcohol and 100 parts of ethanol.
One of the purposes of the invention can be realized by the following technical scheme:
the structural formula of the dehydroabietic surfactant is shown as (I):
in the formula I, R1，R2，R3Independently selected from C1-C18 alkyl groups.
The preparation method of the dehydroabietic surfactant comprises the following steps:
(1) dissolving dehydroabietylamine in anhydrous ethanol with the weight of 1.5-2.0 times of that of the dehydroabietylamine, slowly adding bromoalkane, and then carrying out reflux reaction at the temperature of 80-90 ℃ for 20-26 hours;
(2) cooling to 25-35 ℃, adding iodoalkyl, stirring for 10-15 hours in the dark, and performing rotary evaporation to remove ethanol and unreacted alkane to obtain an intermediate product A;
(3) washing the intermediate product A with petroleum ether at 45-55 ℃ until the petroleum ether layer is colorless, dissolving the remainder in a certain amount of water, wherein the material ratio of the remainder to the water is 1g:0.8-1.2ml, then extracting and washing with diethyl ether for 3 times, and drying in vacuum to obtain the dehydroabietic quaternary ammonium salt;
(4) adding the dehydrogenated rosin quaternary ammonium salt into a 250mL three-neck flask filled with concentrated H2SO4 at the temperature of-10.5 to-9.5 ℃, stirring for 0.4 to 0.6 hour, then dropwise adding ice water, carrying out suction filtration, and washing with the ice water to obtain a washing product;
(5) putting the washing product into a three-neck flask, adding a sodium chloride solution which is 2-3 times of the weight of the washing product and accounts for 20 mass percent, refluxing and stirring for 0.4-0.6 h at 75-85 ℃, carrying out suction filtration, washing, and carrying out vacuum drying at 45-55 ℃ to obtain the washing product.
In the preparation method of the dehydroabietylamine surfactant, the molar ratio of dehydroabietylamine to bromoalkyl to iodoalkyl in the steps (1) and (2) is 1:1: 2; the dehydrogenated rosin quaternary ammonium salt and concentrated H in the step (4)2SO4And the material-liquid ratio of dropwise adding ice water is 1g: 5-7 mL: 14-18 mL.
The general formula of the alkyl bromide is R3Br, and the general formula of the alkyl iodide is R1I or R2I; r3 is one of C1-C18 alkyl, and R1 and R2 are one of C1-C18 alkyl.
R3 is one of C8-C16 alkyl, R1 and R2 are methyl alkyl.
The betaine type amphoteric surfactant is composed of dodecyl dimethyl hydroxypropyl phosphate betaine and cocamidopropyl betaine according to the weight ratio of 1: 0.8-2.
The cationic surfactant is polyoxyethylene quaternary ammonium salt.
The second purpose of the invention can be realized by the following technical scheme:
the preparation method of the pressure-reducing and injection-increasing agent for the water injection well of the low-permeability oil reservoir comprises the steps of dissolving cetyl alcohol in ethanol, then adding a dehydroabietylamine surfactant and a betaine-type amphoteric surfactant, and mixing and stirring uniformly; adding cationic surfactant, and stirring.
The invention also discloses a use method of the blood pressure reducing and injection increasing agent, which is diluted by water when in use:
1) separate injection: when the rock wall of the reservoir is adhered with a high-pressure water injection well group or a single well of an oil film, the current situation can meet the injection allocation requirement, and the high-pressure water injection well group or the single well is directly extruded into the pressure-reducing injection-increasing agent.
2) Compound pressure reduction and injection increase: the low-permeability high-pressure water injection well with insufficient or no water absorption capacity is injected with the pressure-reducing injection-increasing agent in the invention while implementing acidification and injection-increasing, so as to realize pressure-reducing and injection-increasing cooperatively.
3) Continuous injection: the pressure-reducing injection-increasing agent is continuously injected with water injection at the concentration of 0.1 percent, so that the water injection pressure can be reduced, and the recovery ratio can be improved.
Compared with the prior art, the invention has the following advantages:
(1) green and environment-friendly: the rosin amine surfactant as the main component belongs to a green surfactant, the raw material is rosin and belongs to a natural product, the synthesized surfactant generally has good ecological performance, meets the requirement of 'raw material greening' of the 'green' surfactant, and the rosin resource belongs to a renewable raw material, the annual output of China is about 50 ten thousand tons, is the first in the world, reasonably develops and utilizes the rosin resource, and has excellent economic benefit and social benefit for China.
(2) The effect of reducing blood pressure and increasing injection is good: the pressure-reducing injection-increasing agent disclosed by the invention can remove an oil film boundary layer through emulsification solubilization, wherein a cationic component takes water as a transfer medium to form a molecular film on the surface of a rock, so that clay is stabilized, the wettability of the rock is improved, and the water injection friction and capillary resistance are reduced.
Detailed Description
The present invention is not intended to be limited to the following examples, which are intended to be illustrative only, and the invention is not intended to be limited to the following examples, wherein dodecyl dimethyl hydroxypropyl phosphate betaine and cocamidopropyl betaine, both available from Shanghai Shengxuan, Biochemical industries, are used.
Example 1A pressure-reducing and injection-increasing agent for a water injection well of a low permeability reservoir
Comprises the following components in parts by weight: 50 parts of dehydroabietic surfactant, 4 parts of dodecyl dimethyl hydroxypropyl phosphate betaine, 5 parts of cocamidopropyl betaine, 18 parts of polyoxyethylene quaternary ammonium salt, 5 parts of cetyl alcohol and 100 parts of ethanol;
the structural formula of the dehydroabietic surfactant is as follows:
in the formula I, R1And R2Is methyl alkyl, R3Is dodecyl.
The preparation method of the dehydroabietic surfactant comprises the following steps:
(1) dissolving dehydroabietylamine in absolute ethyl alcohol with the weight 1.8 times of that of the dehydroabietylamine, slowly adding bromododecane, and then carrying out reflux reaction at the temperature of 85 ℃ for 24 hours;
(2) cooling to 30 ℃, adding methyl iodide, stirring for 12 hours in a dark place, and performing rotary evaporation to remove ethanol and unreacted alkane to obtain an intermediate product A;
(3) washing the intermediate product A with 50 ℃ petroleum ether until the petroleum ether layer is colorless, dissolving the remainder in a certain amount of water, wherein the material ratio of the remainder to the water is 1g to 1ml, then extracting and washing with diethyl ether for 3 times, and drying in vacuum to obtain dehydrorosin quaternary ammonium salt;
(4) adding dehydrogenated rosin quaternary ammonium salt into concentrated H at-10 deg.c2SO4Stirring the 250mL three-neck flask for 0.5 hour, then dropwise adding ice water, carrying out suction filtration, and washing with the ice water to obtain a washing product;
(5) putting the washing product into a three-neck flask, adding a sodium chloride solution which is 2 times of the weight of the washing product and accounts for 20 mass percent, refluxing and stirring for 0.5 hour at 80 ℃, performing suction filtration, washing, and performing vacuum drying at 50 ℃ to obtain the washing product;
in the steps (1) and (2), the molar ratio of dehydroabietylamine, bromododecane and methyl iodide is 1:1: 2; the dehydrogenated rosin quaternary ammonium salt and concentrated H in the step (4)2SO4The feed-liquid ratio of the dropwise added ice water was 1g:6mL:16 mL.
The preparation method comprises the following steps: dissolving cetyl alcohol in ethanol, adding dehydroabietylamine surfactant and betaine amphoteric surfactant, mixing and stirring; adding cationic surfactant, and stirring.
Example 2A pressure-reducing and injection-increasing agent for a water injection well of a low permeability reservoir
Comprises the following components in parts by weight: 52 parts of dehydroabietic surfactant, 3 parts of dodecyl dimethyl hydroxypropyl phosphate betaine, 4 parts of cocamidopropyl betaine, 22 parts of polyoxyethylene quaternary ammonium salt, 8 parts of cetyl alcohol and 100 parts of ethanol;
the structural formula of the dehydroabietic surfactant is as follows:
in the formula I, R1And R2Is methyl alkyl, R3Is an octyl group.
The preparation method of the dehydroabietic surfactant comprises the following steps:
(1) dissolving dehydroabietylamine in absolute ethyl alcohol with the weight 1.5 times of that of the dehydroabietylamine, slowly adding bromooctane, and then carrying out reflux reaction at the temperature of 80 ℃ for 26 hours;
(2) cooling to 35 ℃, adding methyl iodide, stirring for 10 hours in a dark place, and performing rotary evaporation to remove ethanol and unreacted alkane to obtain an intermediate product A;
(3) washing the intermediate product A with 55 ℃ petroleum ether until the petroleum ether layer is colorless, dissolving the remainder in a certain amount of water, wherein the material ratio of the remainder to the water is 1g to 1.2ml, then extracting and washing with diethyl ether for 3 times, and drying in vacuum to obtain the dehydroabietic quaternary ammonium salt;
(4) adding dehydrogenated rosin quaternary ammonium salt into concentrated H at-10.5 deg.c2SO4Stirring the 250mL three-neck flask for 0.6 h, then dropwise adding ice water, carrying out suction filtration, and washing with the ice water to obtain a washing product;
(5) putting the washing product into a three-neck flask, adding a sodium chloride solution which is 3 times of the weight of the washing product and accounts for 20 mass percent, refluxing and stirring for 0.6 hour at 85 ℃, performing suction filtration, washing, and performing vacuum drying at 45 ℃ to obtain the washing product;
in the steps (1) and (2), the molar ratio of the dehydroabietylamine to the bromooctane to the methyl iodide is 1:1: 2; the dehydrogenated rosin quaternary ammonium salt and concentrated H in the step (4)2SO4The ratio of the feed solution to the dropwise added ice water was 1g:5mL:14 mL.
The preparation method is similar to example 1.
Example 3A pressure-reducing and injection-increasing agent for a water injection well of a low permeability reservoir
Comprises the following components in parts by weight: 55 parts of dehydroabietic surfactant, 5 parts of dodecyl dimethyl hydroxypropyl phosphate betaine, 6 parts of cocamidopropyl betaine, 18 parts of polyoxyethylene quaternary ammonium salt, 8 parts of cetyl alcohol and 100 parts of ethanol;
the structural formula of the dehydroabietic surfactant is as follows:
in the formula I, R1And R2Is methyl alkyl, R3Is hexadecyl.
The preparation method of the dehydroabietic surfactant comprises the following steps:
(1) dissolving dehydroabietylamine in absolute ethyl alcohol with the weight 2.0 times of that of the dehydroabietylamine, slowly adding bromohexadecane, and then carrying out reflux reaction at the temperature of 90 ℃ for 20 hours;
(2) cooling to 25 ℃, adding methyl iodide, stirring for 15 hours in a dark place, and performing rotary evaporation to remove ethanol and unreacted alkane to obtain an intermediate product A;
(3) washing the intermediate product A with 45 ℃ petroleum ether until the petroleum ether layer is colorless, dissolving the remainder in a certain amount of water, wherein the material ratio of the remainder to the water is 1g to 0.8ml, then extracting and washing with ether for 3 times, and drying in vacuum to obtain dehydroabietic quaternary ammonium salt;
(4) adding dehydrogenated rosin quaternary ammonium salt into concentrated H at-9.5 deg.c2SO4Stirring the 250mL three-neck flask for 0.4 hour, then dropwise adding ice water, carrying out suction filtration, and washing with the ice water to obtain a washing product;
(5) putting the washing product into a three-neck flask, adding a sodium chloride solution which is 3 times of the weight of the washing product and accounts for 20 mass percent, refluxing and stirring for 0.6 hour at 75 ℃, performing suction filtration, washing, and performing vacuum drying at 55 ℃ to obtain the washing product;
in the steps (1) and (2), the molar ratio of dehydroabietylamine, bromohexadecane and methyl iodide is 1:1: 2; in the step (4)The dehydrogenated rosin quaternary ammonium salt and the concentrated H2SO4The feed-liquid ratio of the dropwise added ice water was 1g:7mL:18 mL.
The preparation method is similar to example 1.
Example 4A pressure-reducing and injection-increasing agent for a water injection well of a low permeability reservoir
Comprises the following components in parts by weight: 53 parts of dehydroabietic surfactant, 5 parts of dodecyl dimethyl hydroxypropyl phosphate betaine, 4 parts of cocamidopropyl betaine, 19 parts of polyoxyethylene quaternary ammonium salt, 6 parts of cetyl alcohol and 100 parts of ethanol;
the structural formula of the dehydroabietic surfactant is as follows:
in the formula I, R1And R2Is octadecyl, R3Is methyl.
The difference in the preparation method of the dehydroabietic surfactant from example 1 is: replacing bromododecane with methyl bromide; methyl iodide was replaced with octadecyl iodide, otherwise as in example 1;
the preparation method is similar to example 1.
Example 5A pressure-reducing and injection-increasing agent for a water injection well of a low permeability reservoir
Comprises the following components in parts by weight: 52 parts of dehydroabietic surfactant, 3 parts of dodecyl dimethyl hydroxypropyl phosphate betaine, 6 parts of cocamidopropyl betaine, 18 parts of polyoxyethylene quaternary ammonium salt, 7 parts of cetyl alcohol and 100 parts of ethanol;
the structural formula of the dehydroabietic surfactant is as follows:
in the formula I, R1And R2Is nonanyl, R3Is octadecyl.
The difference in the preparation method of the dehydroabietic surfactant from example 1 is: replacing bromododecane with bromooctadecane; methyl iodide was replaced with nonane iodide, otherwise as in example 1;
the preparation method is similar to example 1.
Test example 1 surface tension, solubilizing ability, wettability changing ability, anti-swelling ability and emulsion dispersing ability test
(1) Surface tension test: the surface tension of the pressure-reducing injection-increasing agent was measured at room temperature using a K100 surface tension meter.
(2) Solubilization experiment
Adding 25ml of the pressure-reducing and injection-increasing agent in the embodiment into 8 100ml volumetric flasks, adding 0ml, 0.05ml, 0.10ml, 0.15ml, 0.20ml, 0.30ml, 0.40ml and 0.50ml of toluene respectively, diluting the mixture to full scale with deionized water, keeping the temperature in a constant-temperature water bath at 50 ℃ for 0.5h, and measuring the absorbance of the solution at 500nm wavelength by using an ultraviolet spectrophotometer at the constant temperature of 50 ℃; and (3) plotting the absorbance against the volume of the added toluene, wherein the number of milliliters corresponding to the turning point is the volume of the toluene solubilized by the surfactant solution.
Solubilizing power A of pressure-reducing injection-increasing agentM(ml/ml) calculated according to formula (1):
in formula (1):
AM-solubilization capacity, ml/ml;
V1-milliliters, ml, of toluene corresponding to the turning point;
V0-volume of the pressure-reducing injection-increasing agent, ml;
c-concentration of the pressure-reducing injection-increasing agent,%.
(3) Wettability test
Testing by adopting a Washburn method; the steps are as follows: the 100-120 mesh quartz sand is cleaned, dried to constant weight at 105 ℃ and placed in a dryer for standby. Preparing the decompression injection-increasing agent solution with different concentrations, weighing clean quartz sand, pouring the quartz sand into the solution with a liquid-solid ratio of 50:7, uniformly stirring, placing the bottle into an air oscillator for oscillation for 48 hours, taking out the quartz sand and drying. Weighing 6g of treated quartz sand, filling the quartz sand into a sand filling pipe twice, uniformly vibrating and compacting the quartz sand, and ensuring that the filling height of the sand filling pipe is the same each time so as to ensure that the stacking density of the sand is constant. Note that: before filling sand, the pipe wall of the sand filling pipe is pre-wetted with liquid to be measured and dried, so that the liquid can stably rise along the pipe wall of the sand filling pipe. And placing the sand filling pipe on the bracket and keeping the sand filling pipe vertical to the ground, and recording the height H of the rising liquid level and the corresponding time t when the sand filling pipe just contacts the liquid level. The wetting angle was calculated as follows.
H2＝k(cosθ)t (2)
(4) Anti-swelling experiment
Weighing 3 parts of 1g (accurate to 0.01g) of bentonite, filling the bentonite into three centrifugal tubes, respectively adding a decompression injection increasing agent solution, distilled water and kerosene to 20mL of scales, fully shaking up, standing for 2h, centrifuging, and reading out the volume V of the swelled bentonite1、V2And V0. The anti-swelling rate is calculated according to the formula (3):
examples 1-5 were tested using the method described above and the results are shown in table 1:
TABLE 1 surface tension, solubilization ability, wettability-changing ability of pressure-reducing injection-increasing agent
As can be seen from Table 1, the pressure-reducing injection-increasing agent disclosed by the invention has good surface tension, solubilization capacity, wettability-changing capacity and anti-swelling effect.
(5) Ability to emulsify and disperse oil
150ml of the pressure-reducing injection-increasing agent of each of examples 1 to 5 was added to 5g of crude oil, and the crude oil was dispersed after stirring with a glass rod, which indicates that the pressure-reducing injection-increasing agent disclosed in the present invention can well emulsify the crude oil.
(6) Effect of field application
1. High 36-32 wells: g5 one-off water injection well, 2013.8 throwing injection, oil pressure 29.1MPa when normal water injection, water injection difficulty. Fracturing injection increasing after overhaul in 2016 (9 months), starting at 2016.11.26, oil pressure at 24.0MPa and daily injection at 20m3. Cumulative injection of 523m fracturing fluid in fracturing construction396m of waste water3A large amount of fracturing fluid is left in the stratum, and acidification, the pressure-reducing injection-increasing agent and biological enzyme (for removing the residual glue pollution of the fracturing fluid) composite injection-increasing construction are adopted; 2016.12.4 start the injection, the oil pressure is 13.1MPa, the daily water injection is 20m3Until 2017.10.20 is effective.
2. Nanbao 43-X4820 wells: 2012.3.1 transferring, 2016.4.20 starting after operation, oil pressure 30MPa, daily injection 50m3Average practice 34m3And the water injection is difficult, the connection with the production horizons of the oil wells NP43-X4828 and NP43-X4822 is good, and the two oil wells have low pressure and low yield and serious insufficient liquid supply. 2016.12.22 days continuously injecting 0.1% of the pressure-reducing and injection-increasing system of the invention for 2 months, the daily injection amount is 34m3Rise to 50m3The pressure is reduced from 30MPa to 23.4MPa, the daily liquid and oil production of the oil well NP43-X4828 is steadily increased, and the oil well NP is effective until 2017.10.12.
Claims (6)
1. The pressure-reducing and injection-increasing agent for the water injection well of the low-permeability oil reservoir is characterized by comprising the following components in parts by weight: 50-55 parts of dehydroabietic surfactant, 7-11 parts of betaine amphoteric surfactant, 18-22 parts of cationic surfactant, 5-8 parts of cetyl alcohol and 100 parts of ethanol;
the structural formula of the dehydroabietic surfactant is shown as a formula I:
formula IIn, R1，R2，R3Independently selected from C1-C18 alkyl;
the dehydroabietic surfactant is prepared by the following steps:
(1) dissolving dehydroabietylamine in absolute ethyl alcohol with the weight of 1.5-2.0 times of that of the dehydroabietylamine, slowly adding bromoalkane, and performing reflux reaction at the temperature of 80-90 ℃ for 20-26 hours;
(2) cooling to 25-35 ℃, adding alkyl iodide, stirring for 10-15 hours in a dark place, and performing rotary evaporation to remove ethanol and unreacted alkane to obtain an intermediate product A;
(3) washing the intermediate product A with petroleum ether at 45-55 ℃ until a petroleum ether layer is colorless, dissolving residues in a certain amount of water, wherein the material ratio of the residues to the water is 1g:0.8-1.2ml, then extracting and washing with diethyl ether for 3 times, and performing vacuum drying to obtain the dehydrorosin quaternary ammonium salt;
(4) at the temperature of-10.5 to-9.5 ℃, adding dehydrogenated rosin quaternary ammonium salt into the solution containing concentrated H2SO4Stirring the 250mL three-neck flask for 0.4-0.6 h, then dropwise adding ice water, carrying out suction filtration, and washing with the ice water to obtain a washing product;
(5) putting the washing product into a three-neck flask, adding a sodium chloride solution which is 2-3 times of the weight of the washing product and accounts for 20% of the weight of the washing product, refluxing and stirring for 0.4-0.6 h at 75-85 ℃, performing suction filtration, washing, and performing vacuum drying at 45-55 ℃ to obtain the washing product;
the bromoalkane has a general formula of R3Br, alkyl iodide of the formula R1I or R2I；R3Is one of C1-C18 alkyl, R1And R2Is one of C1-C18 alkyl.
2. The low permeability reservoir water injection well pressure-reducing and injection-increasing agent of claim 1, wherein the preparation method of the dehydroabietylamine surfactant comprises the steps of preparing dehydroabietylamine, bromoalkane and iodoalkane at a molar ratio of 1:1: 2; the dehydrogenated rosin quaternary ammonium salt and the concentrated H2SO4And the material-liquid ratio of dropwise adding ice water is 1g: 5-7 mL: 14-18 mL.
3. According toThe low permeability reservoir water injection well pressure-reducing and injection-increasing agent of claim 1, wherein R is R3Is one of C8-C16 alkyl, R1，R2Is a methyl group.
4. The pressure-reducing and injection-increasing agent for the water injection well of the low-permeability oil reservoir of claim 1, wherein the betaine-type amphoteric surfactant is composed of dodecyl dimethyl hydroxypropyl phosphate betaine and cocamidopropyl betaine according to a weight ratio of 1: 0.8-2.
5. The low permeability reservoir water injection well pressure-reducing and injection-increasing agent of claim 1, wherein the cationic surfactant is polyoxyethylene quaternary ammonium salt.
6. A preparation method of the low permeability oil reservoir water injection well pressure-reducing and injection-increasing agent is characterized in that cetyl alcohol is dissolved in ethanol, and then a dehydroabietylamine surfactant and a betaine amphoteric surfactant are added, mixed and stirred uniformly; adding the cationic surfactant, and uniformly stirring to obtain the product.
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| CN110656914B (en) * | 2019-10-14 | 2021-09-14 | 四川瑞冬科技有限公司 | Method for reducing pressure and increasing injection of low-permeability oil reservoir |
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