CN115011319A - Three-phase foam system for temperature resistance, salt tolerance and oil displacement and preparation method and application thereof - Google Patents
Three-phase foam system for temperature resistance, salt tolerance and oil displacement and preparation method and application thereof Download PDFInfo
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- CN115011319A CN115011319A CN202210710457.6A CN202210710457A CN115011319A CN 115011319 A CN115011319 A CN 115011319A CN 202210710457 A CN202210710457 A CN 202210710457A CN 115011319 A CN115011319 A CN 115011319A
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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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- 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
- C09K8/594—Compositions used in combination with injected gas, e.g. CO2 orcarbonated gas
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Abstract
The invention provides a temperature-resistant salt-tolerant flooding three-phase foam system and a preparation method and application thereof. The three-phase foam system for oil displacement of the invention has the foam volume of 350mL generated by 100mL of foaming liquid through a Blender-Waring method under the conditions of 80 ℃, 100000mg/L NaCl and 500mg/L calcium and magnesium ion concentration, the half-life period is 34min, and the three-phase foam system for oil displacement is used in water flooding and CO flooding 2 After gas flooding, 0.5PV foam was injected and CO was added 2 The final oil recovery rate of the gas flooding is 70.78%, which is improved by 39.15% compared with the water flooding. In addition, the invention can still keep the foam stability for a long time under the high temperature condition, has good tolerance to calcium and magnesium ions, effectively reduces gas channeling, starts residual oil after water flooding and gas flooding, obviously improves the recovery ratio, and is suitable for secondary development of high-temperature and high-salinity conventional sandstone oil reservoirs.
Description
Technical Field
The invention relates to the technical field of oil field exploration, in particular to a temperature-resistant salt-tolerant oil displacement three-phase bubble system and a preparation method and application thereof.
Background
As more and more oil fields in China enter the middle and later development stages, the recovery ratio of water injection development is gradually reduced, and the water content of produced liquid is gradually increased. Foam injection is an anti-channeling method with remarkable effect, the anti-channeling mechanism of the method is mainly that the liquid flow steering effect is achieved through selective plugging of foam on a high-permeability zone, and meanwhile, the foam has high apparent viscosity and can effectively control the gas-oil fluidity ratio, so that the gas swept volume is improved to the maximum extent. However, foams themselves suffer from poor stability under reservoir conditions, and therefore most of the current research is focused on improving the stability of foams under severe conditions.
In order to solve the problem, researchers at home and abroad carry out a great deal of research, and various foam systems such as nanoparticle stable foam, organic amine stable foam, polymer stable foam, carboxymethyl cellulose stable foam and the like are proved to be applicable to the operation of improving the recovery ratio. However, the existing system is difficult to play a role in the oilfield field due to the limitations of price, no high temperature resistance, no salt tolerance and the like.
In view of the above, the invention provides a temperature-resistant salt-tolerant oil displacement three-phase foam system and a preparation method thereof, wherein raw materials are cheap and easy to obtain, and the three-phase foam system has a good effect under complex oil reservoir conditions.
Disclosure of Invention
The invention aims to provide a temperature-resistant salt-tolerant oil displacement three-phase bubble system, and a preparation method and application thereof, aiming at the defects in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the first purpose of the invention is to provide a temperature-resistant salt-tolerant oil displacement three-phase foam system which is prepared from 0.3-0.7 part by weight of anionic surfactant, 0.3-0.5 part by weight of zwitterionic surfactant, 3-7 parts by weight of solid-phase particles, 2-5 parts by weight of dispersant and 100 parts by weight of water, wherein the volume ratio of the gas to the oil displacement three-phase foam system is 1:1-4: 1.
Further, the anionic surfactant is one or two of alpha-olefin sodium sulfonate (AOS) and Sodium Dodecyl Benzene Sulfonate (SDBS).
Further, the zwitterionic surfactant is Cocamidopropyl Hydroxysultaine (CHSB).
Further, the solid-phase particles are fly ash.
Further, the dispersing agent is sodium soil.
Further, the gas is carbon dioxide.
The second purpose of the invention is to provide a preparation method of the three-phase foam system for temperature resistance, salt tolerance and oil displacement, which comprises the following steps:
step S1, pouring a certain amount of deionized water into a beaker, adding inorganic salt into the beaker, and preparing simulated formation water;
step S2, placing the beaker on a magnetic stirrer, setting a first preset rotating speed, adding a certain amount of anionic surfactant into the beaker in the step S1, and stirring until the anionic surfactant is completely dissolved;
step S3, adding a certain amount of zwitterionic surfactant into the solution obtained in step S2, and stirring until the zwitterionic surfactant is completely dissolved;
step S4, adding a certain amount of dispersant into the mixture obtained in step S3, and stirring the mixture to fully suspend the mixture;
step S5, adding a certain amount of solid phase particles into the mixture obtained in the step S4, and stirring the mixture to fully suspend the mixture to obtain foaming liquid;
step S6, sealing the stirred foaming liquid with a preservative film, and aging in a thermostat;
and step S7, transferring the aged foaming liquid to a high-speed stirrer, setting a second preset rotating speed, introducing carbon dioxide into the high-speed stirrer for 10min, setting the rotating speed to be 8000r/min, and stirring for 2min to obtain the three-phase foam system for oil displacement.
Further, the first preset rotating speed is 350 r/min-400 r/min, and the second preset rotating speed is 6000 r/min-8000 r/min.
Further, the aging time in the step S6 is 48-60 h.
The third purpose of the invention is to provide the three-phase foam system solution for oil displacement for preparing the foam profile control and flooding agent for the oil field.
Compared with the prior art, the technical scheme provided by the invention has the beneficial effects that:
(1) hair brushThe three-phase foam system for oil displacement is characterized in that the volume of foam generated by 100mL of foaming liquid through a Blender-Waring method is 350mL under the conditions of 80 ℃, 100000mg/L NaCl and 500mg/L calcium and magnesium ion concentration, the half-life period is 34min, and the three-phase foam system for oil displacement is used for water flooding and CO flooding 2 After gas flooding, 0.5PV foam was injected and CO was added 2 The final oil recovery rate of the gas flooding is increased by 39.15 percent compared with that of the water flooding, and is 70.78 percent. In addition, the invention can still keep foam stability for a long time under the condition of high temperature, has good tolerance to calcium and magnesium ions, effectively reduces gas channeling, starts residual oil after water drive and gas drive, can keep foam stability when the concentration of sodium ions is lower than 150000mg/L, the concentration of calcium and magnesium ions is lower than 5000mg/L and the temperature is lower than 120 ℃, obviously improves the recovery ratio, and is suitable for secondary development of high-temperature and high-salinity conventional sandstone oil reservoirs.
(2) The three-phase foam system for oil displacement provided by the invention forms a gas-liquid-solid three-phase foam system by introducing the solid-phase particle fly ash, can plug a high-water-content and high-permeability area, enables a displacement fluid to be transferred into a low-permeability and high-oil-content area which is not reached before, and can be used for secondary development after water flooding and gas flooding of a conventional sandstone oil reservoir. The anionic surfactant in the three-phase foam system for oil displacement and the positively charged fly ash particles can generate a synergistic effect. Part of the anionic surfactant is adsorbed on the surface of the fly ash particles, so that the hydrophobicity of the fly ash particles is enhanced, and the fly ash particles are arranged on a gas-liquid interface instead of entering a liquid phase, thereby enhancing the stability of foam. The fly ash has poor suspension property and is easy to settle after being dispersed in a solution, so that sodium soil is required to be added into the system as a dispersing agent. The sodic soil is electronegative, the fly ash is electropositive, the sodic soil and the fly ash are easy to attract, and the sodic soil is attached to fly ash particles, so that the density of the particles is reduced, the suspension property is enhanced, the particles can be kept stable for a longer time, and the performance of three-phase foam is improved.
(3) The preparation method provided by the invention has the advantages of mild technical conditions, simplicity, feasibility, environmental friendliness and wide market development potential.
Drawings
FIG. 1 is a schematic diagram of the principle of improving foam stability by fly ash;
FIG. 2 is a diagram showing the influence of sodium soil on the suspension property of fly ash; obviously, the settling time of the fly ash suspension added with the sodium soil is delayed by 3 hours, the particle size of the fly ash is micron-sized, the suspension property is poor, and the sodium soil is selected as a suspending agent to be attached to the fly ash particles, so that the settling time of the suspension can be effectively delayed.
FIG. 3 is core displacement experimental data; in the foam flooding stage, the water content is reduced, the injection pressure is increased, and the recovery ratio is increased, which shows that the invention can play a role in adjusting the injection profile, increasing the injection pressure and increasing the recovery ratio; the crude oil recovery efficiency is improved by 39.15 percent compared with that of water drive under the conditions of 80 ℃, the NaCl concentration of 100000mg/L and the calcium and magnesium ion concentration of 500 mg/L;
FIG. 4 is a graph comparing the foam properties of the three-phase foam system for flooding prepared in examples 1-4; obviously, in different embodiments, the temperature, the mineralization degree and the formula content are different, the obtained foams have different properties, the time corresponding to the volume of the separation liquid of 50mL is the half-life period of the separation liquid, and the half-lives of the foams corresponding to the embodiments 1 to 4 are respectively 34min, 31min, 25min and 19 min;
fig. 5 is a schematic diagram of a core displacement experimental apparatus.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in further detail below with reference to specific examples and accompanying drawings.
Examples 1-4 determination of crude oil recovery Using core Displacement experiments
A schematic diagram of the core displacement experimental device is shown in fig. 5, and the specific test steps are as follows:
(1) the cores used (heterogeneous cores with permeability 200mD/1600 mD) were evacuated and then saturated with formation water.
(2) The incubator is heated to the experimental temperature, the back pressure at the tail end is made to be atmospheric pressure, and the ring pressure is set to be 5 MPa.
(3) The cores were saturated with oil and aged in an incubator for 12 h.
(4) Water-driven 1PV, CO 2 Flooding 0.5PV, foam flooding 0.5PV, subsequent CO 2 Drive 0.5 PV.
(5) And the foam driving adopts a foam generator to foam, and the foam is generated and then injected into the rock core.
(6) Water flooding, CO in sequence 2 Flooding, foam flooding, and subsequent CO 2 And (5) driving. And recording the pressure and the oil production at each moment, and the water production until the test is finished.
Example 1
Step S1, pouring a certain amount of deionized water into a beaker, adding inorganic salt into the beaker, and preparing 100000mg/L of NaCl and inorganic salt solution with calcium and magnesium ion concentration of 500 mg/L;
step S2, placing the beaker on a magnetic stirrer, setting the rotating speed to be 350r/min, adding 0.5 part by mass of an anionic surfactant AOS into the beaker, and stirring for 30min until the anionic surfactant AOS is completely dissolved;
step S3, adding 0.3 part by mass of zwitterionic surfactant CHSB into a beaker, and stirring for 30min until complete dissolution;
step S4, adding 2.5 parts by mass of dispersant sodium soil into a beaker, and stirring for 30min to enable the mixture to be fully suspended;
step S5, adding 5 parts by mass of solid-phase particle fly ash into a beaker, and stirring for 30min to enable the solid-phase particle fly ash to be fully suspended;
step S6, sealing the stirred foaming liquid with a preservative film, placing the sealed foaming liquid in a thermostat, and aging for 48 hours at 80 ℃;
step S7, transferring the aged foaming liquid to a high-speed stirrer, and introducing CO into the high-speed stirrer 2 Gas is used for 10min, the set rotating speed is 8000r/min, and the stirring time is 2 min.
The volume of 100mL of foam generated by the foaming solution through the Blender-Waring method is 350mL, the half life period is 34min, and the foam is subjected to water flooding and CO flooding 2 After gas flooding, 0.5PV foam was injected and CO was added 2 The final oil recovery rate of the gas flooding is 70.78%, which is improved by 39.15% compared with the water flooding.
Example 2
Step S1, pouring a certain amount of deionized water into a beaker, adding inorganic salt into the beaker according to actual requirements, and preparing an inorganic salt solution of 150000mg/L NaCl;
step S2, placing the beaker on a magnetic stirrer, setting the rotating speed to be 350r/min, adding 0.5 part by mass of an anionic surfactant SDBS into the beaker, and stirring for 30min until the anionic surfactant SDBS is completely dissolved;
step S3, adding 0.3 part by mass of zwitterionic surfactant CHSB into a beaker, and stirring for 30min until complete dissolution;
step S4, adding 2.5 parts by mass of dispersant sodium soil into a beaker, and stirring for 30min to enable the mixture to be fully suspended;
step S5, adding 5 parts by mass of solid-phase particle fly ash into a beaker, and stirring for 30min to enable the solid-phase particle fly ash to be fully suspended;
step S6, sealing the stirred foaming liquid with a preservative film, placing the sealed foaming liquid in a thermostat, and aging for 48 hours at 80 ℃;
step S7, transferring the aged foaming liquid to a high-speed stirrer, and introducing CO into the high-speed stirrer 2 Gas is used for 10min, the set rotating speed is 8000r/min, and the stirring time is 2 min.
The volume of 100mL of foam generated by the Blender-Waring method is 330mL, the half-life period is 31min, and the foam is driven by water and subjected to CO 2 After gas flooding, 0.5PV foam was injected and CO was added 2 The final oil recovery rate of the gas flooding is 36.67 percent, which is improved by 36.67 percent compared with the water flooding.
Example 3
Step S1, pouring a certain amount of deionized water into a beaker, adding inorganic salt into the beaker according to actual requirements, and preparing a solution with the concentration of calcium and magnesium ions being 5000 mg/L;
step S2, placing the beaker on a magnetic stirrer, setting the rotating speed to be 350r/min, adding 0.5 part by mass of an anionic surfactant AOS into the beaker, and stirring for 30min until the anionic surfactant AOS is completely dissolved;
step S3, adding 0.3 part by mass of zwitterionic surfactant CHSB into a beaker, and stirring for 30min until complete dissolution;
step S4, adding 2.5 parts by mass of dispersant sodium soil into a beaker, and stirring for 30min to enable the mixture to be fully suspended;
step S5, adding 5 parts by mass of solid-phase particle fly ash into a beaker, and stirring for 30min to enable the solid-phase particle fly ash to be fully suspended;
step S6, sealing the stirred foaming liquid with a preservative film, and aging in a thermostat at 80 ℃ for 48 h;
step S7, the aged foaming liquid is mixedTransferring to a high-speed stirrer, and introducing CO 2 Gas is used for 10min, the set rotating speed is 8000r/min, and the stirring time is 2 min.
The volume of 100mL of foam generated by the Blender-Waring method is 310mL, the half-life period is 25min, and the foam is driven by water and subjected to CO 2 After gas flooding, 0.5PV foam was injected and CO was added 2 The final oil recovery rate of the gas flooding is 63.66 percent, which is 32.52 percent higher than that of the water flooding.
Example 4:
step S1, pouring a certain amount of deionized water into a beaker, adding inorganic salt into the beaker according to actual requirements, and preparing 100000mg/L NaCl inorganic salt solution with calcium and magnesium ion concentration of 500 mg/L;
step S2, placing the beaker on a magnetic stirrer, setting the rotating speed to be 350r/min, adding 0.5 part by mass of an anionic surfactant AOS into the beaker, and stirring for 30min until the anionic surfactant AOS is completely dissolved;
step S3, adding 0.3 part by mass of zwitterionic surfactant CHSB into a beaker, and stirring for 30min until complete dissolution;
step S4, adding 2.5 parts by mass of dispersant sodium soil into a beaker, and stirring for 30min to enable the mixture to be fully suspended;
step S5, adding 5 parts by mass of solid-phase particle fly ash into a beaker, and stirring for 30min to enable the solid-phase particle fly ash to be fully suspended;
step S6, sealing the stirred foaming liquid with a preservative film, placing the sealed foaming liquid in a thermostat, and aging for 48 hours at 120 ℃;
step S7, transferring the aged foaming liquid to a high-speed stirrer, and introducing CO into the high-speed stirrer 2 Gas is used for 10min, the set rotating speed is 8000r/min, and the stirring time is 2 min.
The volume of 100mL foam generated by the Blender-Waring method of 100mL foaming solution is 320mL, the half-life period is 19min, and the foaming solution is applied to water flooding and CO 2 After gas flooding, 0.5PV foam was injected and CO was added 2 The final oil recovery rate of gas flooding is 60.82%, which is 28.37% higher than that of water flooding.
The embodiments and features of the embodiments described herein above may be combined with each other without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The three-phase foam system for temperature resistance, salt tolerance and oil displacement is characterized by being prepared from 0.3-0.7 part by weight of anionic surfactant, 0.3-0.5 part by weight of zwitterionic surfactant, 3-7 parts by weight of solid-phase particles, 2-5 parts by weight of dispersant and 100 parts by weight of water, wherein the volume ratio of the gas to the three-phase foam system for oil displacement is 1:1-4: 1.
2. The temperature-resistant salt-tolerant oil displacement three-phase foam system of claim 1, wherein the anionic surfactant is one or two of sodium alpha-olefin sulfonate and sodium dodecyl benzene sulfonate.
3. The temperature-resistant, salt-tolerant, and oil-displacing three-phase foam system of claim 1, wherein the zwitterionic surfactant is cocamidopropyl hydroxysultaine.
4. The temperature-resistant, salt-tolerant and oil-displacing three-phase foam system of claim 1, wherein the solid phase particles are fly ash.
5. The temperature-resistant, salt-tolerant and oil-displacing three-phase foam system of claim 1, wherein the dispersant is sodium soil.
6. The temperature-resistant, salt-tolerant and oil-displacing three-phase foam system of claim 1, wherein the gas is carbon dioxide.
7. The preparation method of the three-phase foam system for temperature resistance, salt tolerance and oil displacement according to any one of claims 1 to 6, characterized by comprising the following steps:
s1, pouring a certain amount of deionized water into a container, adding inorganic salt into the container, and preparing simulated formation water;
s2, placing the container on a magnetic stirrer, setting a first preset rotating speed, adding a certain amount of anionic surfactant into the container, and stirring until the anionic surfactant is completely dissolved;
s3, adding a certain amount of zwitterionic surfactant into the container, and stirring until the zwitterionic surfactant is completely dissolved;
s4, adding a certain amount of dispersant into the container, and stirring to fully suspend the dispersant;
s5, adding a certain amount of solid-phase particles into the container, and stirring to fully suspend the solid-phase particles to obtain foaming liquid;
s6, sealing the stirred foaming liquid with a preservative film, and aging in a thermostat;
and S7, transferring the aged foaming liquid to a high-speed stirrer, setting a second preset rotating speed, introducing carbon dioxide into the high-speed stirrer for 10min, setting the rotating speed to be 8000r/min, and stirring for 2min to obtain the foam material.
8. The method of claim 7, wherein the first predetermined rotational speed is 350r/min to 400r/min and the second predetermined rotational speed is 6000r/min to 8000 r/min.
9. The method of claim 7, wherein the aging time in step S6 is 48 to 60 hours.
10. The use of the three-phase foam system for flooding according to any one of claims 1 to 6, wherein the three-phase foam system solution for flooding is used for preparing an oilfield foam profile control agent.
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