CN114479815B - Alkoxy silane polyether, composition and application thereof - Google Patents
Alkoxy silane polyether, composition and application thereof Download PDFInfo
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- CN114479815B CN114479815B CN202011165666.4A CN202011165666A CN114479815B CN 114479815 B CN114479815 B CN 114479815B CN 202011165666 A CN202011165666 A CN 202011165666A CN 114479815 B CN114479815 B CN 114479815B
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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
- 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
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Abstract
The invention discloses an alkoxy silane polyether, which is characterized in that the molecular general formula of the alkoxy silane polyether is shown as a formula (I); in the formula (I), R 1 、R 2 、R 3 And R 4 Selected from hydrogen, alkyl or alkenyl; poly is selected fromWherein m is the number of oxyethylene groups and the value range of m is 0-10; n is the number of oxypropylene groups, and the value range of n is 0-10; x is the number of oxybutylene groups, and the value range of x is 0-10; when m is 0, n and x are not 0 at the same time; when m is not 0, x is not 0 either; most preferably x is other than 0. The invention also discloses a polyether composition containing the alkoxy silane, and a preparation method and application thereof.
Description
Technical Field
The invention relates to an alkoxysilane polyether and a composition containing the alkoxysilane polyether, which can modify the surface of an oil reservoir stratum from water wetting to neutral wetting or obviously reduce water injection pressure.
Background
Water flooding is a major means of supplementing energy to formations during oilfield development to enhance oilfield recovery. After the oil field is put into development, the energy of the oil layer is continuously consumed along with the increase of the exploitation time, so that the pressure of the oil layer is continuously reduced, the underground crude oil is largely degassed, the viscosity is increased, the oil well yield is greatly reduced, even the blowout and the production stop are caused, and a large amount of dead oil remains in the underground and cannot be exploited. In order to compensate for the underground defect caused by crude oil extraction, maintain or increase the oil layer pressure, realize the high and stable yield of the oil field, obtain higher recovery ratio, the oil field must be injected with water. The level of the water injection well management technology determines the quality of the oil field development effect and also determines the length of the oil field development life.
Due to long-term water injection, the wettability of the near-wellbore zones of many oil wells is changed into strong water wetting, and the pressure of water injection is higher and higher, so that water injection is more and more difficult. A wide range of underinjection occurs in some oil fields. The average production of the under-injected well group at the under-injected interval is lower than the average production level of the water flooding due to the poor physical property of the reservoir. The underinjection is mainly distributed in the middle-high pressure injection water layer. The main cause of the undernote: firstly, the reservoir of the main underinjected block belongs to a low-hole and low-permeability reservoir, the pore throat belongs to a middle-hole thin throat, the water injection flow resistance is high, the water injection pressure is close to the stratum fracture pressure, and the pressure increasing and injection increasing space is small; secondly, the reservoir clay mineral component content is high, and the water sensitivity leads to the aggravation of underfilling.
Basic studies have shown that the specific interaction of a strongly hydrophilic surface with water molecules results in the arrangement of water molecules adjacent to the surface being different from bulk water, which has a much greater viscosity. The pore size of the reservoir stratum is mostly in the order of a few microns, and the water ratio near the surface is high, so that the flow resistance of water in the water-wet pores of the bulk phase is much higher than that of water in the water-wet pores of the bulk phase, and the flow resistance of water in the water-wet pores of the neutral phase or the oil-wet phase is much lower. In order to improve water flooding, technical means are required to adjust formation wettability in near wellbore zones to neutral wetting or oil wetting.
Many oil companies and researchers have developed a technique for modifying the surface of a formation with hydrophobic nanoparticles in order to modify the wettability of near wellbore zones to neutral or oil wet. (1) The Russian 'bubble Lei Xier' drag reduction injection-increasing technology is to dissolve hydrophobic nano particles in organic carrying agents such as diesel oil and inject the hydrophobic nano particles into a stratum, and the nano particles are adsorbed and deposited on the surface of the stratum, so that the injection pressure can be effectively reduced. (2) The hydrophobic nano particles of the Henan university development series are injected and dissolved in organic carrying agent or water, and the hydrophobic nano particles are deposited and adsorbed on the surface of the stratum after being injected into the stratum, so that the water injection pressure can be effectively reduced. (3) The southwest petroleum university utilizes hexamethyldisiloxane to modify hydrophilic nano particles to obtain hydrophobic nano particles, then the hydrophobic nano particles are dissolved in an organic carrying agent, and a surfactant is used for dispersing in water to obtain the water-based nano depressurization and injection increase. The core experimental result shows that the composite material has the performance of reducing pressure and increasing injection. (4) Hydrophobic nano particles are directly dispersed in water by using a surfactant at northeast petroleum university, and a rock core experiment shows that the nano particles have the performance of reducing pressure and increasing injection. This technique is typically used to prepare hydrophobic nanoparticles, initially dispersed with an organic solvent, injected into near wellbore zones to modify formation wettability, and to improve safety and reduce costs, aqueous emulsions are used to disperse the nanoparticles.
The nano particles are utilized to modify the wettability of the near-wellbore zone from strong water wetting to neutral wetting or oil wetting, so that obvious effects are achieved, the injection pressure is obviously reduced in some oil reservoirs, and the underinjection is improved. However, modifying the formation with nanoparticles has certain drawbacks: 1) Is applicable to only a few formation conditions; 2) There is a potential risk of plugging the formation; 3) The degree of lowering the injection pressure is lower; 4) The nano particles are not connected with the stratum by chemical bonds, and the durability of the coating is not strong. These disadvantages are directly linked to this technical feature. Wang Fei et al (science bulletins, 2009, 14) show that modifying the surface of a formation from water wet to neutral wet or oil wet can significantly reduce water injection resistance only when the pore diameter is less than 5 microns, but not significantly above 5 microns. While the concentration of the nanoparticles is usually 0.1wt% when the nanoparticles are dispersed in the emulsion, if the nanoparticles are to be prevented from forming a complete coating in 2 μm pores, the nanoparticles should have a diameter of less than 2 nm, and should be well dispersed in the aqueous emulsion, uniformly spread on the surface of the water-wet stratum, and be bonded to the stratum in a chemically bonding manner. This is difficult to achieve in practice. If the aqueous emulsion obtained by injecting the nanoparticles in large quantities is at risk of blocking the formation pores, high demands are made on the specific operations on site. According to the experimental results reported at present, the adopted nano particles are usually more than tens of nanometers, the preparation concentration is about 0.1%wt, and the core experimental results show that the injection pressure can be reduced to a certain extent, but the core experimental results are only applicable to the range with narrower pore range.
Because the water injection well after water flooding generally has the problem of being converted into strong water wetting due to the wettability of the near-wellbore zone, the enhanced oil recovery effect can be obviously improved if the problem can be solved. The existing technology for modifying stratum by nano particles has some defects, so the technology is not popularized and applied yet. Although other techniques exist, such as using active water instead of purified wastewater to reduce the resistance to seepage, the cost of injection increases by 15-30 yuan/m 3 Has no economic application value. At present, an effective injection increasing means for a low-permeability underinjected well is lacking.
Disclosure of Invention
Aiming at developing the technology of the composition containing the alkoxy silane polyether, the invention can modify the wettability of the oil reservoir stratum from water wet to neutral wet or oil wet to obviously reduce the water injection pressure of an oil well, has the advantages of simple operation, obvious effect, environmental protection and low cost, and can obviously improve the water injection condition of a hypotonic underinjected well and improve the water flooding development effect.
The invention aims to solve the technical problems that the nanoparticle modification technology for reducing pressure and increasing injection in the prior art has narrow application range, unobvious effect improvement and complex operation, and provides an alkoxysilane polyether composition which comprises alkoxysilane polyether, alkali, organic salt and inorganic salt.
The second technical problem to be solved by the invention is to provide a preparation method of the alkoxysilane polyether composition corresponding to one of the technical problems to be solved.
The third object of the present invention is to provide an application of a polyether composition containing alkoxysilane corresponding to one of the objects.
In order to solve one of the above technical problems, a first aspect of the present invention provides an alkoxysilane polyether, which is characterized in that the molecular general formula of the alkoxysilane polyether is:
in the formula (I), R 1 、R 2 、R 3 And R 4 Selected from hydrogen, alkyl or alkenyl;
poly is selected from
Wherein m is the number of oxyethylene groups and the value range of m is 0-10; n is the number of oxypropylene groups, and the value range of n is 0-10; x is the number of oxybutylene groups, and the value range of x is 0-10; when m is 0, n and x are not 0 at the same time; when m is not 0, x is not 0 either; most preferably x is other than 0.
In the above technical scheme, the molecular general formula of the alkoxysilane polyether is preferably:
in the formula (II), R 1 、R 2 、R 3 And R 4 Selected from hydrogen or alkyl;
m is the number of oxyethylene groups, and the value range of m is 0-5;
n is the number of oxypropylene groups, and the value range of n is 3-10;
x is the number of oxybutylene groups and has a value ranging from 0 to 10.
In a preferred embodiment of the above aspect of the present invention, R 1 Preferably C4-8 alkyl, more preferably C2-4 straight chain alkyl.
At the bookIn a preferred embodiment of the above aspect of the invention, R 2 Preferably C4-8 alkyl, more preferably C2-4 straight chain alkyl.
In a preferred embodiment of the above aspect of the present invention, R 3 Preferably C4-8 alkyl, more preferably C2-4 straight chain alkyl.
In a preferred embodiment of the above aspect of the present invention, R 4 Preferably C4-8 alkyl, more preferably C2-4 straight chain alkyl.
The second aspect of the invention provides an alkoxysilane-containing polyether composition comprising, in parts by mass:
0.05-5 parts of alkoxy silane polyether;
0.0001-5 parts of alkali;
0.0001-5 parts of organic acid;
0.05-5 parts of organic salt;
0.05-5 parts of inorganic salt; and
97-80 parts of water.
In a preferred embodiment of the above-described aspect of the present invention, the base is at least one selected from the group consisting of sodium hydroxide, potassium hydroxide, lithium hydroxide, rubidium hydroxide, cesium hydroxide, magnesium hydroxide, calcium hydroxide, ammonia and urea.
In a preferred embodiment of the above technical solution of the present invention, the organic acid is at least one selected from formic acid, acetic acid, citric acid, oxalic acid and malic acid.
In a preferred embodiment of the above-described embodiment of the present invention, the amount of the base added to the formulated solution is 0.0001% (wt) to 5% (wt), more preferably 0.001% (wt) to 1% (wt) with respect to the total mass of the solution.
In a preferred embodiment of the above-described technical scheme of the present invention, the organic acid is added to the formulated solution in an amount of 0.0001% (wt) to 5% (wt), more preferably 0.001% (wt) to 1% (wt) relative to the total mass of the solution.
In a preferred embodiment of the above-described technical solution of the present invention, the organic salt is at least one selected from the group consisting of citrate, malate, acetate, formate, and the like of an alkali metal or an alkaline earth metal; more preferably at least one selected from the group consisting of sodium citrate, potassium citrate, magnesium citrate, calcium citrate, ammonium citrate, sodium acetate, potassium acetate, magnesium acetate, calcium acetate, ammonium acetate, sodium formate, potassium formate and ammonium formate.
In a preferred embodiment of the above-described technical aspect of the present invention, the inorganic salt is at least one selected from halides, sulfates, nitrates, or phosphates of alkali metals or alkaline earth metals; more preferably at least one selected from sodium chloride, potassium chloride, magnesium chloride, sodium bromide, potassium bromide, magnesium bromide, sodium sulfate, potassium sulfate, magnesium sulfate, sodium phosphate and potassium phosphate, still more preferably at least one selected from sodium chloride, potassium chloride, magnesium chloride or sodium sulfate, most preferably at least one selected from sodium chloride, magnesium chloride or sodium sulfate.
In a preferred embodiment of the above technical solution of the present invention, the alkoxysilane polyether composition preferably further includes, in parts by mass: (4) 98-80 parts of water; the water may be fresh water, brine, or formation water, and more preferably water having a mineralization degree of 0 to 250000 mg/L.
In a preferred embodiment of the above-mentioned technical solution of the present invention, the alkoxysilane polyether composition may be a composition obtained by uniformly mixing an alkoxysilane polyether, an organic salt and an inorganic salt, or may be a concentrate, a paste or a solution obtained by uniformly mixing the three with water.
In a third aspect of the present invention, the present invention also provides a method for preparing an alkoxysilane-containing polyether aqueous solution, comprising the steps of:
s1, dissolving alkali in deionized water, tap water or field water of an oil/gas field at normal temperature;
s2, dissolving alkoxy silane polyether in alkaline water, uniformly stirring, and standing at normal temperature for 2 hours;
and S3, adding inorganic salt into the aqueous solution of the surfactant in a solid or aqueous solution form, directly adding organic acid into the mixed solution after uniform mixing, and uniformly stirring to obtain the environment-friendly aqueous solution of the wettability modifier.
In a third aspect of the invention, the invention also provides an alkoxysilane polyether composition or the use of the alkoxysilane-containing polyether composition in oil recovery in an oilfield.
Among the above technical schemes, the preferable scheme is: the temperature of the application is preferably 15 ℃ to 100 ℃; in the aqueous solution of the alkoxysilane-containing polyether composition, the concentration of the aqueous solution of the alkoxysilane-containing polyether composition is preferably 0.05% by weight to 2% by weight based on the mass of the aqueous solution of the alkoxysilane-containing polyether composition.
In the above technical solution, the aqueous solution of the alkoxysilane-containing polyether composition is insensitive to water quality and can be tap water, river water, brine, field water of oil field, clear water, sewage and other water sources well known to those skilled in the art; is especially suitable for oil reservoir stratum water. The prepared aqueous solution containing the alkoxysilane polyether composition is injected into a stratum at normal temperature, and then the water injection operation can be carried out by closing the well and opening the well after closing the well for 0.5 to 10 days.
The wettability of the pore surfaces in porous media has a great influence on the flow resistance of water, with wettability in the micro-and nano-scale pores being a major factor affecting water flow. Typically, the water flow resistance is greater in water-wet pores and less in neutral-wet or oil-wet pores. The aqueous solution of the alkoxysilane-containing polyether composition can be smoothly injected into the pores of a water-wet stratum, a neutral-wet or oil-wet coating is formed on the surfaces of the pores, and the flow resistance and injection pressure of injected water are obviously reduced. The aqueous solution of the alkoxysilane-containing polyether composition prepared by the invention only contains alkoxysilane polyether, alkali, organic salt and inorganic salt, does not contain aromatic ring structure, and is easy to biodegrade. The alkoxy silane polyether has the advantages of easily available raw materials, mature synthetic route, lower cost of final products and the like. The aqueous solution of the alkoxysilane polyether composition obtained by the invention is suitable for changing the wettability of the near-wellbore zone of a water injection well (modifying the water-wet surface into neutral wetting or oil wetting) and reducing the injection pressure.
Effects of the invention
The alkoxysilane polyether composition aqueous solution prepared by the invention can modify the near well zone of the water injection well of the Henan oilfield from water wetting to neutral wetting, the injection pressure is reduced by 30%, and a better technical effect is obtained.
Drawings
Fig. 1 is a graph of core injection pressure change for comparative example 1.
Detailed Description
The present invention will be further described in detail with reference to examples, but the scope of the present invention is not limited to the scope of the examples.
The endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and are understood to encompass values approaching those ranges or values. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.
Example 1
40mg of NaOH is dissolved in 989 ml of tap water, 10 g of trimethoxypolyoxypropylene ether group (n=6, m=0, x=0) silane is added, the mixture is stirred uniformly and then kept stand for 2 hours at normal temperature, finally citric acid is added to adjust the pH of the aqueous solution to 9.5, and the mixture is stirred uniformly for standby.
50ml of the aqueous composition solution was placed in a 100ml screw reagent bottle, and after placing a slide glass, the sealed blue-cap reagent bottle was placed in an oven at 60℃for 2 days. Taking out the soaked glass slide, washing with deionized water, and drying at 110 ℃ for later use. The contact angle of the slide before and after the immersion treatment was measured with Kruss DSA 100 and measured at 35 ° and 83 °, respectively. It can be seen that the slide surface changed from water wet to neutral wet after the trimethoxypolyoxypropylene ether (n=6) silane composition aqueous solution treatment.
Injecting simulated water into the core at a rate of 0.05ml/min0.05 mD), generally with increasing water injection, the injection pressure rises rapidly, gradually decreases and remains stable at 1.3MPa after the injection pressure reaches a maximum of 1.6MPa, then the aqueous solution of the formulated composition is injected, stopped after 1.1PV injection, and the core is kept at 60 ℃ for 2 days before and after closing the shut-off valve. The core was then injected with simulated water at 2PV and the injection pressure of the simulated water was reduced to 1.0MPa. Experimental results show that the treatment of the aqueous solution of the composition can effectively reduce the injection pressure.
Example 2
40mg of NaOH is dissolved in 989 ml of tap water, 10 g of trimethoxypolyoxypropylene ether group (n=8, m=0, x=0) silane is added, the mixture is stirred uniformly and then kept stand for 2 hours at normal temperature, finally citric acid is added to adjust the pH of the aqueous solution to 9.5, and the mixture is stirred uniformly for standby.
50ml of the aqueous composition solution was placed in a 100ml screw reagent bottle, and after placing a slide glass, the sealed blue-cap reagent bottle was placed in an oven at 60℃for 2 days. Taking out the soaked glass slide, washing with deionized water, and drying at 110 ℃ for later use. The contact angle of the slide before and after the immersion treatment was measured with Kruss DSA 100 and measured at 35 ° and 83 °, respectively. It can be seen that the slide surface changed from water wet to neutral wet after the trimethoxypolyoxypropylene ether (n=6) silane composition aqueous solution treatment.
Injecting simulated water into the core at a rate of 0.05ml/min0.05 mD), generally with increasing water injection, the injection pressure rises rapidly, gradually decreases and remains stable at 1.4MPa after the injection pressure reaches a maximum of 1.6MPa, then the aqueous solution of the formulated composition is injected, stopped after 1.1PV injection, and the core is kept at 60 ℃ for 2 days before and after closing the shut-off valve. The core was then injected with simulated water at 2PV and the injection pressure of the simulated water was reduced to 1.05MPa. Experimental results show that the treatment of the aqueous solution of the composition can effectively reduce the injection pressure.
Example 3
40mg of NaOH is dissolved in 989 ml of tap water, 10 g of trimethoxy polyoxyethylene ether (m=3) polyoxypropylene ether (n=8) polyoxybutylene ether (x=4) silane is added, the mixture is stirred uniformly and then is kept stand for 2 hours at normal temperature, finally citric acid is added to adjust the PH of the aqueous solution to 9.5, and the mixture is stirred uniformly for standby.
50ml of the aqueous composition solution was placed in a 100ml screw reagent bottle, and after placing a slide glass, the sealed blue-cap reagent bottle was placed in an oven at 60℃for 2 days. Taking out the soaked glass slide, washing with deionized water, and drying at 110 ℃ for later use. The contact angle of the slide before and after the immersion treatment was measured with Kruss DSA 100 and was 35 ° and 90 °, respectively. It can be seen that the slide surface changed from water wet to neutral wet after the trimethoxypolyoxypropylene ether (n=6) silane composition aqueous solution treatment.
Injecting simulated water into the core at a rate of 0.05ml/min0.05 mD), generally with increasing water injection, the injection pressure rises rapidly, gradually decreases and remains stable at 1.35MPa after the injection pressure reaches a maximum of 1.7MPa, then the aqueous solution of the formulated composition is injected, stopped after 1.1PV injection, and the core is kept at 60 ℃ for 2 days before and after closing the shut-off valve. The core was then injected with simulated water at 2PV and the injection pressure of the simulated water was reduced to 0.9MPa. Experimental results demonstrate that treatment of the aqueous composition is effective in reducing injection pressure.
Example 4
40mg of NaOH is dissolved in 989 ml of tap water, 10 g of trimethoxy polyoxyethylene ether (m=5) polyoxybutylene ether (x=8, n=0) silane is added, the mixture is stirred uniformly and then kept stand for 2 hours at normal temperature, finally citric acid is added to adjust the pH of the aqueous solution to 9.5, and the mixture is stirred uniformly for standby.
50ml of the aqueous composition solution was placed in a 100ml screw reagent bottle, and after placing a slide glass, the sealed blue-cap reagent bottle was placed in an oven at 60℃for 2 days. Taking out the soaked glass slide, washing with deionized water, and drying at 110 ℃ for later use. The contact angles of the slides before and after the soak treatment were measured with Kruss DSA 100 and were 35 ° and 94 °, respectively. It can be seen that the slide surface changed from water wet to neutral wet after the treatment with an aqueous solution of trimethoxy data oxovinylether (m=5) polyoxybutenylether (x=8) silane composition.
Injecting simulated water into the core at a rate of 0.05ml/min0.05 mD), generally with increasing water injection, the injection pressure rises rapidly, gradually decreases and remains stable at 1.38MPa after the injection pressure reaches a maximum of 1.65MPa, then the aqueous solution of the formulated composition is injected, stopped after 1.1PV injection, and the core is kept at 60 ℃ for 2 days before and after closing the shut-off valve. The core was then injected with simulated water at 2PV and the injection pressure of the simulated water was reduced to 0.92MPa. Experimental results demonstrate that treatment of the aqueous composition is effective in reducing injection pressure.
Example 5
40mg of NaOH is dissolved in 989 ml of tap water, 10 g of triethoxy polyoxyethylene ether (m=5) polyoxybutylene ether (x=10, n=0) silane is added, the mixture is stirred uniformly and then kept stand for 2 hours at normal temperature, finally citric acid is added to adjust the pH of the aqueous solution to 9.5, and the mixture is stirred uniformly for standby.
50ml of the aqueous composition solution was placed in a 100ml screw reagent bottle, and after placing a slide glass, the sealed blue-cap reagent bottle was placed in an oven at 60℃for 2 days. Taking out the soaked glass slide, washing with deionized water, and drying at 110 ℃ for later use. The contact angle of the slide before and after the immersion treatment was measured with Kruss DSA 100 and the contact angle measurements were 35 ° and 96 °, respectively. It can be seen that the slide surface changed from water wet to neutral wet after the treatment with an aqueous solution of trimethoxy data oxovinylether (m=5) polyoxybutenylether (x=8) silane composition.
Injecting simulated water into the core at a rate of 0.05ml/min0.05 mD), generally with increasing amount of injected water, the injection pressure rises rapidly, gradually decreases and remains stable at 1.32 after the injection pressure reaches a maximum of 1.6MPaAnd (3) injecting the prepared composition aqueous solution under the pressure of Mpa, stopping after injecting the composition aqueous solution into the pressure of 1.1PV, closing the front and rear stop valves of the rock core, and preserving the heat for 2 days at 60 ℃. The core was then injected with simulated water at 2PV and the injection pressure of the simulated water was reduced to 0.83MPa. Experimental results demonstrate that treatment of the aqueous composition is effective in reducing injection pressure.
Example 6
40mg of NaOH is dissolved in 989 ml of tap water, 10 g of triethoxy polyoxyethylene ether (m=2) polyoxypropylene ether (n=6) polyoxybutylene ether (x=3) silane is added, the mixture is stirred uniformly and then is kept stand for 2 hours at normal temperature, finally citric acid is added to adjust the PH of the aqueous solution to 9.5, and the mixture is stirred uniformly for standby.
50ml of the aqueous composition solution was placed in a 100ml screw reagent bottle, and after placing a slide glass, the sealed blue-cap reagent bottle was placed in an oven at 60℃for 2 days. Taking out the soaked glass slide, washing with deionized water, and drying at 110 ℃ for later use. The contact angles of the slides before and after the soak treatment were measured with Kruss DSA 100 and were 35 ° and 94 °, respectively. It can be seen that the slide surface changed from water wet to neutral wet after the treatment with the aqueous solution of the triethoxy polyoxyethylene ether (m=2) polyoxypropylene ether (n=6) polyoxybutylene ether (x=3) silane composition.
Injecting simulated water into the core at a rate of 0.05ml/min0.05 mD), generally with increasing water injection, the injection pressure rises rapidly, gradually decreases and remains stable at 1.25MPa after the injection pressure reaches a maximum of 1.5MPa, then the aqueous solution of the formulated composition is injected, stopped after 1.1PV injection, and the core is kept at 60 ℃ for 2 days before and after closing the shut-off valve. The core was then injected with simulated water at 2PV and the injection pressure of the simulated water was reduced to 0.97MPa. Experimental results demonstrate that treatment of the aqueous composition is effective in reducing injection pressure.
Example 7
40mg of NaOH is dissolved in 989 ml of tap water, 10 g of triethoxy polyoxyethylene ether (m=2) polyoxypropylene ether (n=6) polyoxybutylene ether (x=3) silane is added, the mixture is stirred uniformly and then is kept stand for 2 hours at normal temperature, finally citric acid is added to adjust the PH of the aqueous solution to 9.5, and the mixture is stirred uniformly for standby.
50ml of the aqueous composition solution was placed in a 100ml screw reagent bottle, and after placing a slide glass, the sealed blue-cap reagent bottle was placed in an oven at 60℃for 2 days. Taking out the soaked glass slide, washing with deionized water, and drying at 110 ℃ for later use. The contact angles of the slides before and after the soak treatment were measured with Kruss DSA 100 and were 35 ° and 94 °, respectively. It can be seen that the slide surface changed from water wet to neutral wet after the treatment with the aqueous solution of the triethoxy polyoxyethylene ether (m=2) polyoxypropylene ether (n=6) polyoxybutylene ether (x=3) silane composition.
Injecting simulated water into the core at a rate of 0.05ml/min0.01 mD), generally with increasing water injection, the injection pressure rises rapidly, gradually decreases and remains stable at 1.8MPa after the injection pressure reaches a maximum of 2.3MPa, then the aqueous solution of the formulated composition is injected, stopped after 1.1PV injection, and the core is kept at 60 ℃ for 2 days before and after closing the shut-off valve. The core was then injected with simulated water at 2PV and the injection pressure of the simulated water was reduced to 1.2MPa. Experimental results demonstrate that treatment of the aqueous composition is effective in reducing injection pressure.
Example 8
40mg of NaOH is dissolved in 989 ml of tap water, 10 g of triethoxy polyoxyethylene ether (m=2) polyoxypropylene ether (n=6) polyoxybutylene ether (x=3) silane is added, the mixture is stirred uniformly and then is kept stand for 2 hours at normal temperature, finally citric acid is added to adjust the PH of the aqueous solution to 9.5, and the mixture is stirred uniformly for standby.
50ml of the aqueous composition solution was placed in a 100ml screw reagent bottle, and after placing a slide glass, the sealed blue-cap reagent bottle was placed in an oven at 60℃for 2 days. Taking out the soaked glass slide, washing with deionized water, and drying at 110 ℃ for later use. The contact angles of the slides before and after the soak treatment were measured with Kruss DSA 100 and were 35 ° and 94 °, respectively. It can be seen that the slide surface changed from water wet to neutral wet after the treatment with the aqueous solution of the triethoxy polyoxyethylene ether (m=2) polyoxypropylene ether (n=6) polyoxybutylene ether (x=3) silane composition.
Injecting simulated water into the core at a rate of 0.05ml/min0.05 mD), generally with increasing water injection, the injection pressure rises rapidly, gradually decreases and remains stable at 2.4MPa after the injection pressure reaches a maximum of 2.7MPa, then the aqueous solution of the formulated composition is injected, stopped after 1.1PV injection, and the core is kept at 60 ℃ for 2 days before and after closing the shut-off valve. The core was then injected with simulated water at 2PV and the injection pressure of the simulated water was reduced to 1.7MPa. Experimental results demonstrate that treatment of the aqueous composition is effective in reducing injection pressure.
Example 9
40mg of NaOH is dissolved in 989 ml of tap water, 10 g of triethoxy polyoxyethylene ether (m=2) polyoxypropylene ether (n=6) polyoxybutylene ether (x=3) silane is added, the mixture is stirred uniformly and then is kept stand for 2 hours at normal temperature, finally citric acid is added to adjust the PH of the aqueous solution to 9.5, and the mixture is stirred uniformly for standby.
50ml of the aqueous composition solution was placed in a 100ml screw reagent bottle, and after placing a slide glass, the sealed blue-cap reagent bottle was placed in an oven at 60℃for 2 days. Taking out the soaked glass slide, washing with deionized water, and drying at 110 ℃ for later use. The contact angles of the slides before and after the soak treatment were measured with Kruss DSA 100 and were 35 ° and 94 °, respectively. It can be seen that the slide surface changed from water wet to neutral wet after the treatment with the aqueous solution of the triethoxy polyoxyethylene ether (m=2) polyoxypropylene ether (n=6) polyoxybutylene ether (x=3) silane composition.
Injecting simulated water into the core at a rate of 0.05ml/min0.07 mD), generally with increasing water injection, the injection pressure rises rapidly, gradually decreases and remains stable at 1.7MPa after the injection pressure reaches a maximum of 2.5MPa, then the aqueous solution of the formulated composition is injected, and stopped after 1.1PV injection, and shut-offThe shut-off valves were kept at 60℃for 2 days before and after closing the core. The core was then injected with simulated water at 2PV and the injection pressure of the simulated water was reduced to 1.1MPa. Experimental results demonstrate that treatment of the aqueous composition is effective in reducing injection pressure.
Comparative example 1
Yue Yuanzhou et al (development of novel Water-based nano-polysilicone injection-enhancing Agents [ M ]]And (3) filling: the research of southwest petroleum university, 2014) shows that modifying the core with the hydrophobic nanoparticle aqueous emulsion injection enhancer can reduce the flow resistance of injected water to some extent. When simulated water is injected into the core at the rate of 0.05ml/min0.073 mD), as shown in fig. 1, the injection pressure rapidly rises, the displacement pressure reaches 1.61MPa maximum when the injection amount is about 1.2PV, then gradually decreases and stably maintains about 1.38MPa, the water flooding pressure is 10PV, the water flooding steady pressure is 1.37MPa, then the nano injection increasing agent with the concentration of 0.01% is injected, the injection pressure starts to decrease with the increase of the injection amount, the displacement pressure decreases to 1.15MPa after the injection of 2PV injection increasing agent, and the pressure decreases by 0.22MPa. Standing and adsorbing for 24 hours, transferring formation water, and slowly rising the displacement pressure, wherein the surfactant on the hole wall is possibly washed down and reduced, and the pressure is kept around 1.162Mpa after short fluctuation. The resistance to water flow is reduced under the action of the medicament. The rate of renting is obviously lower than that of the patent of the invention.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (13)
1. An alkoxysilane polyether composition comprising, in parts by weight:
0.05-5 parts of alkoxy silane polyether;
0.0001-5 parts of alkali;
0.0001-5 parts of organic acid;
0.05-5 parts of organic salt; and
0.05-5 parts of inorganic salt;
the molecular general formula of the alkoxysilane polyether is:
in the formula (I), R 1 、R 2 、R 3 And R 4 Selected from hydrogen, alkyl or alkenyl; poly is selected from
Wherein m is the number of oxyethylene groups and the value range of m is 0-10; n is the number of oxypropylene groups, and the value range of n is 0-10; x is the number of oxybutylene groups, and the value range of x is 0-10; when m is 0, n and x are not 0 at the same time; when m is not 0, x is not 0 either.
2. The composition of claim 1, wherein x is other than 0.
3. The composition of claim 1 or 2, wherein the alkoxysilane polyether has the molecular formula:
in the formula (II), R 1 、R 2 、R 3 And R 4 Selected from hydrogen or alkyl;
m is the number of oxyethylene groups, and the value range of m is 0-5;
n is the number of oxypropylene groups, and the value range of n is 3-10;
x is the number of oxybutylene groups and has a value ranging from 0 to 10.
4. The alkoxysilane polyether composition of claim 3 wherein R 1 Is C4-8 alkyl.
5. The alkoxysilane polyether composition of claim 3 wherein R 2 Is C4-8 alkyl.
6. The alkoxysilane polyether composition of claim 3 wherein R 3 Is C4-8 alkyl.
7. The alkoxysilane polyether composition of claim 3 wherein R 4 Is C4-8 alkyl.
8. The alkoxysilane polyether composition of claim 1 wherein said R 1 、R 2 And R 3 Selected from hydrogen, C4-10 alkyl or C4-10 alkenyl; r is R 4 Selected from hydrogen, C4-10 alkyl or C4-10 alkenyl.
9. The alkoxysilane polyether composition according to claim 8, wherein said base is at least one selected from the group consisting of sodium hydroxide, potassium hydroxide, lithium hydroxide, rubidium hydroxide, cesium hydroxide, magnesium hydroxide, calcium hydroxide, ammonia, and urea.
10. The alkoxysilane polyether composition according to claim 8, wherein said organic acid is at least one selected from the group consisting of formic acid, acetic acid, citric acid, oxalic acid and malic acid.
11. The alkoxysilane polyether composition according to claim 8, wherein said organic salt is at least one selected from the group consisting of citrate, malate, acetate, formate and oxalate of an alkali metal or alkaline earth metal.
12. The alkoxysilane polyether composition according to claim 8, wherein said inorganic salt is at least one selected from the group consisting of sodium chloride, potassium chloride, magnesium chloride, sodium bromide, potassium bromide, magnesium bromide, sodium sulfate, potassium sulfate, magnesium sulfate, sodium phosphate and potassium phosphate.
13. Use of an alkoxysilane polyether composition according to any one of claims 1 to 12 in oil recovery in an oilfield.
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| CN110385086A (en) * | 2019-08-05 | 2019-10-29 | 江苏广成化工有限公司 | Aqueous, environmental protective multifunctional nano block wetting agent and preparation method thereof |
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