CN112143475B - High-mineralization-tolerance oil displacement foam system and preparation method thereof - Google Patents
High-mineralization-tolerance oil displacement foam system and preparation method thereof Download PDFInfo
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- CN112143475B CN112143475B CN202010978437.8A CN202010978437A CN112143475B CN 112143475 B CN112143475 B CN 112143475B CN 202010978437 A CN202010978437 A CN 202010978437A CN 112143475 B CN112143475 B CN 112143475B
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- 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 a high-mineralization-tolerance oil displacement foam system which comprises a foaming agent, a stabilizer and water, wherein the foaming agent comprises sodium benzenesulfonate, the stabilizer comprises modified black phosphorus nanosheets, and the water comprises ionized water. The oil displacement foam system has the advantages that the black phosphorus nanosheets are subjected to PEG modification, and the mineralization resistance of the polyethylene glycol serving as a nonionic polymer surfactant is utilized, so that the overall mineralization resistance of the oil displacement foam system is improved; the PEG is coated on the surface of the black phosphorus nanosheet to cover the oxidation site of the black phosphorus nanosheet, so that the black phosphorus nanosheet is prevented from being oxidized and decomposed by oxygen in the air, the black phosphorus nanosheet has long-term effectiveness, the stability of an oil displacement foam system is improved, and meanwhile, the PEG on the surface of the black phosphorus nanosheet has a hydrophilic group, so that the hydrophilicity of the black phosphorus nanosheet can be increased, the black phosphorus nanosheet becomes an amphiphilic nanosheet and is favorable for being adsorbed on a gas-liquid interface stable liquid film; the preparation method has the advantages of simple and controllable process, small reagent dosage, low cost and environmental friendliness.
Description
Technical Field
The invention relates to a foam system and a preparation method thereof, in particular to a high-mineralization-tolerance oil displacement foam system and a preparation method thereof.
Background
The oil fields of inland countries are mostly formed by land phase deposition, the problem of reservoir heterogeneity generally exists, and the use of various production increasing measures in long-term exploitation further increases the reservoir heterogeneity, so that the water drive recovery ratio is low; after some oil fields are subjected to long-term water-driving exploitation, a new dominant large pore is formed in the stratum, so that the injected water is easy to rush along the large pore after entering the stratum, the effective utilization rate of the injected water is further reduced, and residual oil in a low-permeability area can not be effectively driven out. The polymer flooding is used as a mature tertiary oil recovery technology, is widely applied to medium and high permeability reservoirs, obtains good oil displacement effect expectation, and cannot be effectively applied due to the fact that the polymer is difficult to inject in low permeability reservoirs due to high viscosity.
Disclosure of Invention
The invention aims to: the first purpose of the invention is to provide an oil displacement foam system with high mineralization tolerance and strong stability; the second purpose of the invention is to provide a preparation method of the oil displacement foam system.
The technical scheme is as follows: the high-mineralization-tolerance oil displacement foam system comprises a foaming agent, a stabilizer and water, wherein the foaming agent comprises sodium benzenesulfonate, the stabilizer comprises modified black phosphorus nanosheets, and the water comprises ionized water.
The components comprise 0.2 to 0.4 weight percent of sodium benzenesulfonate, 99.60 to 99.79 weight percent of ionized water and 0.002 to 0.006 weight percent of modified black phosphorus nanosheet by mass.
Preferably, the modified black phosphorus nanosheets comprise modified black phosphorus nanosheets modified by PEG, and PEG (polyethylene glycol) has a mineralization resistance property as a nonionic high-molecular surfactant.
Preferably, the size range of the modified black phosphorus nanoplatelets comprises 0.2-2 μm.
Preferably, the foaming agent is sodium benzenesulfonate of varying alkyl chain lengths, including 12 to 16 carbons in the alkyl chain length.
Preferably, the mineralization degree of the ionized water is 0-50000ppm, the ionized water is simulated formation ionized water and is prepared according to salt contained in corresponding oil reservoir formation water.
The preparation method of the hypersalinity tolerance oil displacement foam system comprises the following steps:
(1) dissolving the modified black phosphorus nanosheets in water to prepare nanosheet solution;
(2) dripping the nanosheet solution into ionized water to prepare a dispersion solution;
(3) adding sodium benzene sulfonate into the dispersion solution, and stirring for reaction to obtain a final product.
Preferably, in the step (3), the stirring comprises magnetic stirring, and the magnetic stirring time is 5-10 min.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages:
(1) through PEG modification of the black phosphorus nanosheets, the mineralization resistance of the polyethylene glycol serving as a nonionic polymer surfactant is utilized, and the overall mineralization resistance of the oil displacement foam system is improved.
(2) The PEG is coated on the surface of the black phosphorus nanosheet to cover the oxidation site of the black phosphorus nanosheet, so that the black phosphorus nanosheet is prevented from being oxidized and decomposed by oxygen in the air, the black phosphorus nanosheet has long-term effectiveness, and the stability of an oil displacement foam system is improved.
(3) PEG on the surface of the black phosphorus nanosheet has a hydrophilic group, so that the hydrophilicity of the black phosphorus nanosheet can be increased, the black phosphorus nanosheet becomes an amphiphilic nanosheet, and the black phosphorus nanosheet is favorable for being adsorbed on a gas-liquid interface to stabilize a liquid film.
(4) The preparation method has the advantages of simple and controllable process, small reagent dosage, low cost and environmental friendliness.
Drawings
FIG. 1 is a transmission electron micrograph of a modified black phosphorus nanoplate used in a foam system of the present invention;
FIG. 2 is a graph of concentration of modified black phosphorus nanoplates versus foam volume for the foam system of the present invention;
FIG. 3 is a graph of the addition-liquid separation half-life of a foam system modified black phosphorus nanosheet of the present invention;
FIG. 4 is a graph of the amount of black phosphorus nanoplate modified by the foam system of the present invention versus the half-life of the foam;
FIG. 5 is a graph of mineralization of the foam system versus the foaming volume of the foam system of the present invention;
FIG. 6 is a graph of degree of mineralization of the foam system versus half-life of the eluent of the foam system in accordance with the present invention;
FIG. 7 is a graph of mineralization of the foam system versus foam half-life of the foam system of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
The inventor researches and discovers that the foam fluid has the characteristics of strong injectability, selective plugging, high plugging without low plugging, water plugging without oil plugging, and is very suitable for plugging profile control exploitation of low-permeability heterogeneous oil reservoirs. Indoor and mine field experiments prove that the foam fluid has higher resistance factors in the porous medium, can realize the plugging of a high-permeability area in a heterogeneous oil reservoir, improves the integral heterogeneity of a stratum and achieves the aim of improving the recovery ratio. The foamability and stability of a conventional liquid-phase foam system are mainly determined by the performance of a selected foaming agent, and under the condition of high temperature of an oil reservoir and the existence of high-salinity formation water, the foam is extremely easy to break, the plugging and oil displacement capacity is reduced, the plugging strength is limited, the plugging effective period is short, and the mine field profile control effect is not ideal. Accordingly, high stability foam systems have become the focus of research and development by researchers.
With the continuous progress of nanotechnology and material research, nanoparticle-stabilized foam systems are receiving great attention from researchers. The nano particles are distributed on the gas/liquid film interface of the foam through irreversible adsorption, and a multi-layer or net-shaped structure is formed between liquid films, so that the possibility of liquid film breakage can be greatly reduced, and the stability of the foam is greatly improved. Recently, black phosphorus nano-materials are favored by researchers, which are very similar to graphene in performance and structure, exhibit a lamellar network structure, and are widely used for drug-loading and photothermal therapy due to their excellent photothermal properties and modifiability. The invention finds other purposes of the black phosphorus nanosheet, and the black phosphorus nanosheet modified by PEG modification has the effect of stabilizing foam under high mineralization.
As shown in figure 1, the modified black phosphorus nanosheet selected by the invention is irregular and flaky, and the size distribution is concentrated in 0.2-2 μm.
Taking out blocky black phosphorus crystals stored in argon, lightly crushing, weighing 60mg of black phosphorus powder, placing the black phosphorus powder in 100ml of deoxygenated deionized water, then placing the deoxygenated deionized water and the black phosphorus in a beaker, carrying out ice bath ultrasonic crushing, continuously carrying out ultrasonic crushing for 12 hours, selecting 900w of power, carrying out frequency of 19-23 HZ, and keeping the temperature below 4 ℃. After the ultrasonic crushing is finished, transferring the obtained black phosphorus solution into a centrifuge tube, centrifuging for 15min at the rotating speed of 1500rmp, removing large-size black phosphorus which is not fully stripped, carefully collecting supernatant, then placing the supernatant into the centrifuge tube, centrifuging for 20min at the rotating speed of 7800rmp, removing the supernatant, dissolving the centrifuged black phosphorus nanosheet in de-ionized water for use, and placing the de-ionized black phosphorus nanosheet in a vacuum dryer for low-temperature storage.
Weighing 100mg of polyethylene glycol powder, placing the polyethylene glycol powder into 100mL of black phosphorus nanosheet solution, wherein the concentration of the black phosphorus nanosheets is 500 mug/mL, and carrying out low-temperature ultrasonic treatment on the mixed solution for 30min and then violently stirring for reacting for 4 h. Then the obtained mixed solution is transferred into a centrifuge tube, and is centrifuged for 20min at the rotating speed of 7800rmp to remove the excessive polyethylene glycol, and the mixture is washed twice by deionized water. And finally, dissolving the obtained PEG modified black phosphorus nanosheet in deionized water, and storing in a vacuum drier.
Example 1
The modified black phosphorus nanosheet solution is dripped into simulated formation ionic water (the degree of mineralization is 10000ppm), then 0.3g of sodium dodecyl benzene sulfonate is added, and magnetic stirring is carried out for 10min, so as to prepare a foaming system formula with the foaming agent concentration of 0.3 wt% and the modified black phosphorus nanosheet concentration of 0.002 wt%. Foaming was then carried out by the Waring-Blender method with stirring at 30 ℃ and 2700rmp for 3min, and the foaming volume, half-life of the eluent and half-life of the foam were recorded.
Example 2
The modified black phosphorus nanosheet solution is dripped into simulated formation ionic water (the degree of mineralization is 10000ppm), then 0.3g of sodium dodecyl benzene sulfonate is added, and magnetic stirring is carried out for 10min, so as to prepare a foaming system formula with the foaming agent concentration of 0.3 wt% and the modified black phosphorus nanosheet concentration of 0.003 wt%. Foaming was then carried out by the Waring-Blender method with stirring at 30 ℃ and 2700rmp for 3min, and the foaming volume, half-life of the eluent and half-life of the foam were recorded.
Example 3
The modified black phosphorus nanosheet solution is dripped into simulated formation ionic water (the degree of mineralization is 10000ppm), then 0.3g of sodium dodecyl benzene sulfonate is added, and magnetic stirring is carried out for 10min, so as to prepare a foaming system formula with the foaming agent concentration of 0.3 wt% and the modified black phosphorus nanosheet concentration of 0.004 wt%. Foaming was then carried out by the Waring-Blender method with stirring at 30 ℃ under 2700rmp for 3min, and then the foaming volume, the half-life of the eluent and the half-life of the foam were recorded.
Example 4
The modified black phosphorus nanosheet solution is dripped into simulated formation ionic water (the degree of mineralization is 10000ppm), then 0.3g of sodium dodecyl benzene sulfonate is added, and magnetic stirring is carried out for 10min, so as to prepare a foaming system formula with the foaming agent concentration of 0.3 wt% and the modified black phosphorus nanosheet concentration of 0.006 wt%. Foaming was then carried out by the Waring-Blender method with stirring at 30 ℃ under 2700rmp for 3min, and then the foaming volume, the half-life of the eluent and the half-life of the foam were recorded.
Example 5
The modified black phosphorus nanosheet solution is dripped into simulated formation ionic water (the degree of mineralization is 10000ppm), then 0.4g of sodium tetradecyl benzene sulfonate is added, and magnetic stirring is carried out for 10min, so that a foaming system formula with the foaming agent concentration of 0.4 wt% and the modified black phosphorus nanosheet concentration of 0.004 wt% is prepared. Foaming was then carried out by the Waring-Blender method with stirring at 30 ℃ under 2700rmp for 3min, and then the foaming volume, the half-life of the eluent and the half-life of the foam were recorded.
Example 6
The modified black phosphorus nanosheet solution is dripped into simulated formation ionic water (the degree of mineralization is 10000ppm), then 0.2g of sodium hexadecylbenzene sulfonate is added, and magnetic stirring is carried out for 10min, so as to prepare a foaming system formula with the foaming agent concentration of 0.2 wt% and the modified black phosphorus nanosheet concentration of 0.002 wt%. Foaming was then carried out by the Waring-Blender method with stirring at 30 ℃ and 2700rmp for 3min, and the foaming volume, half-life of the eluent and half-life of the foam were recorded.
Example 7
The modified black phosphorus nanosheet solution is dripped into simulated formation ionic water (with the mineralization degree of 20000ppm), then 0.3g of sodium dodecyl benzene sulfonate is added, and magnetic stirring is carried out for 10min, so as to prepare the foaming system formula with the foaming agent concentration of 0.3 wt% and the modified black phosphorus nanosheet concentration of 0.004 wt%. Foaming was then carried out by the Waring-Blender method with stirring at 30 ℃ and 2700rmp for 3min, and the foaming volume, half-life of the eluent and half-life of the foam were recorded.
Example 8
The modified black phosphorus nanosheet solution is dripped into simulated formation ionic water (with the mineralization degree of 50000ppm), then 0.3g of sodium dodecyl benzene sulfonate is added, and magnetic stirring is carried out for 10min, so as to prepare a foaming system formula with the foaming agent concentration of 0.3 wt% and the modified black phosphorus nanosheet concentration of 0.004 wt%. Foaming was then carried out by the Waring-Blender method with stirring at 30 ℃ under 2700rmp for 3min, and then the foaming volume, the half-life of the eluent and the half-life of the foam were recorded.
As can be seen from fig. 2, fig. 3 and fig. 4, in the foam performance of the formula system, with the increase of the concentration of the modified black phosphorus nanosheet, more nanosheets are adsorbed on the liquid film at the gas-liquid interface, and the strength of the liquid film is improved, so that the bubble volume and the foam stability are both increased, and especially the half-life period of the foam is obviously increased.
As can be seen from fig. 5, 6 and 7, the foaming and foam stabilizing performances of the foam system with the foaming agent concentration of 0.3% and the modified black phosphorus nanosheet concentration of 0.004% in water with different mineralization degrees are less, the reduction of the foaming volume along with the increase of the mineralization degree is small, and the half-life period of the liquid precipitation and the half-life period of the foam are less affected, which indicates that the formula system has a better mineralization resistance effect after the modified black phosphorus nanosheet is added.
Claims (8)
1. A high mineralization tolerance oil displacement foam system comprises a foaming agent, a stabilizer and water, and is characterized in that the foaming agent comprises sodium benzenesulfonate, the stabilizer comprises modified black phosphorus nanosheets, and the water comprises ionized water; the modified black phosphorus nanosheet comprises a PEG-modified black phosphorus nanosheet.
2. The highly mineralized tolerant flooding foam system according to claim 1, comprising sodium benzenesulfonate 0.2-0.4 wt%, ionized water 99.60-99.79wt%, and modified black phosphorus nanosheets 0.002-0.006 wt%, by mass.
3. The hypersaline tolerance flooding foam system of claim 1 or 2 wherein the size range of the modified black phosphorus nanoplates comprises 0.2-2 μ ι η.
4. The hypersaline tolerant flooding foam system of claim 1 or 2 wherein the alkyl chain length of the sodium benzenesulfonate comprises 12-16 carbons.
5. The hypersaline tolerance flooding foam system of claim 1 or 2 wherein the degree of mineralization of the ionized water comprises 0-50000 ppm.
6. A method for preparing the highly mineralization tolerant flooding foam system of claim 1, comprising the steps of:
(1) dissolving the modified black phosphorus nanosheets in water to prepare nanosheet solution;
(2) dripping the nanosheet solution into ionized water to prepare a dispersion solution;
(3) and adding sodium benzenesulfonate into the dispersion solution, and stirring for reaction to obtain the final product.
7. The method of claim 6, wherein the stirring in step (3) comprises magnetic stirring.
8. The method for preparing the highly mineralization-resistant flooding foam system according to claim 7, wherein the magnetic stirring time is 5-10 min.
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| CN102746841A (en) * | 2012-06-29 | 2012-10-24 | 中国石油大学(华东) | Nanoparticle-added composite foam system used for oil and gas field and preparation method thereof |
| CN109401742A (en) * | 2018-11-02 | 2019-03-01 | 中国石油大学(华东) | A kind of heat-resistant salt-resistant foam profile system being formulated by highly mineralized formation brines |
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| CN102746841A (en) * | 2012-06-29 | 2012-10-24 | 中国石油大学(华东) | Nanoparticle-added composite foam system used for oil and gas field and preparation method thereof |
| CN109401742A (en) * | 2018-11-02 | 2019-03-01 | 中国石油大学(华东) | A kind of heat-resistant salt-resistant foam profile system being formulated by highly mineralized formation brines |
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