CN108226310B - Method and device for evaluating foam regeneration capability in two-dimensional core displacement process - Google Patents
Method and device for evaluating foam regeneration capability in two-dimensional core displacement process Download PDFInfo
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- CN108226310B CN108226310B CN201611144858.0A CN201611144858A CN108226310B CN 108226310 B CN108226310 B CN 108226310B CN 201611144858 A CN201611144858 A CN 201611144858A CN 108226310 B CN108226310 B CN 108226310B
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Abstract
The invention provides a method and a device for evaluating foam regeneration capability in a two-dimensional core displacement process, wherein the device comprises the following steps: a plurality of equidistant sampling ports are offered to two-dimensional core model one side, and two-dimensional core model intussuseption is filled with the two-dimensional rock core of different particle diameters, and the sampler is used for collecting the rock core fluid of corresponding sampling port. One end of the two-dimensional core model is connected with a six-way valve, and the other end of the six-way valve is respectively connected with a crude oil intermediate container, a foaming agent intermediate container and N 2 The other end of the two-dimensional core model is connected with a back pressure valve which is respectively connected with N 2 The gas cylinder is connected with the produced liquid container, the CT scanner is connected with the two-dimensional core model and is used for scanning CT values of the two-dimensional core under different voltages and different conditions, the core is evaluated through the obtained CT values, the regeneration capacities of different positions and different moments of the foam are evaluated under the condition that the saturation of the fluid in the stratum is considered, and the true value of a reaction experiment can be truly obtained without applying numerical simulation.
Description
Technical Field
The invention relates to oil and gas field development engineering technology, in particular to a method and a device for evaluating foam regeneration capability in a two-dimensional core displacement process.
Background
The foaming agent can be continuously destroyed and regenerated in the core displacement process, the effective concentration can be reduced under the influence of formation fluid, a part of the foaming agent can be adsorbed on the rock surface, and the saturation of the fluid in the formation can influence the regeneration capability of foam in the formation. This greatly reduces the activity of the surfactant in the core, which directly affects the effectiveness of the surfactant flood and the foam flood. Thus, evaluating the foam regeneration capability during core displacement requires both obtaining an effective concentration of foaming agent and a three-phase saturation value at this profile.
The foam regeneration capacity was evaluated by measuring the foam volume and half-life of the resulting foamer solution by stirring it. The method is evaluated by collecting a certain volume of produced fluid, and is the performance of the foaming agent solution produced in a period of time, and the foam regeneration capability of different positions of the stratum cannot be obtained. And the presence of hydrocarbon water in the formation can affect the ability of the blowing agent to regenerate, which has to be considered. In addition, in 2012, in the paper "study and application of foam size and regeneration ability in pore Medium" published in Petroleum geology and engineering, volume 26, phase 1 ", the regeneration ability of several foaming agents was measured by self-assembled visual foam generating and transporting devices, and the foam regeneration ability was evaluated by the ability of foaming agents to generate foam at low concentration, blocking performance at low concentration and dilution ability against formation water, mainly by using the point that the foaming height was greatly affected by concentration, and the foaming volume of foaming agent produced liquid was used to evaluate the foam regeneration ability. In this method, the regeneration capacity of the foaming agent is related to the concentration of the foaming agent, but the liquid amount of the produced liquid is limited, and the produced liquid is produced in a period of time, so that the repeatability of the experimental result is poor, and the influence of factors such as temperature and the like is large.
In summary, most of the current methods for evaluating the foam regeneration capability in the core displacement process are numerical simulation or performing foaming capability and half-life on produced fluid by a stirring method, and thus the foam regeneration capability in the core displacement process cannot be truly and effectively evaluated.
Disclosure of Invention
The invention provides a method and a device for evaluating foam regeneration capability in a two-dimensional core displacement process, which are used for solving the problem that the conventional method for evaluating the foam regeneration capability in the core displacement process is mostly numerical simulation or foaming capability and half-life period of produced liquid by a stirring method cannot truly and effectively evaluate the foam regeneration capability in the core displacement process.
The first aspect of the invention provides an evaluation device for foam regeneration capability in a two-dimensional core displacement process, which comprises the following components: the two-dimensional rock core model is characterized in that one side of the two-dimensional rock core model is provided with a plurality of equidistant sampling ports, and each sampling port is connected with one sampler; two-dimensional rock cores with different particle sizes can be filled in the two-dimensional rock core model; each sampler is used for collecting core fluid at the position of a corresponding sampling port;
one end of the two-dimensional core model is connected with a six-way valve, and the other end of the six-way valve is respectively connected with a crude oil intermediate container, a foaming agent intermediate container and N 2 A gas intermediate container; the other end of the two-dimensional core model is connected with a back pressure valve which is respectively connected with N 2 The gas cylinder is connected with the produced liquid container;
and the CT scanner is connected with the two-dimensional core model and is used for scanning CT values of the two-dimensional core under different voltages and different conditions.
In a specific implementation manner, a gap-shaped cavity with a distance smaller than that between the front side and the rear side of the two-dimensional core model is formed, and the gap-shaped cavity is used for filling core materials with different particle sizes when the two-dimensional core is evaluated.
In a specific implementation, the crude oil intermediate vessel, the foamer intermediate vessel, and the N 2 And the gas intermediate containers are respectively provided with a advection pump, and the advection pumps are used for inputting the fluid in the corresponding intermediate container into the two-dimensional core model through the six-way valve.
In a specific implementation, the crude oil intermediate vessel, the N 2 And pistons are arranged in the gas intermediate containers and the foaming agent intermediate containers, and a advection pump connected with each intermediate container can push the pistons to move so as to enable fluid in the containers to enter the two-dimensional core model.
In a specific implementation mode, each sampler comprises a stainless steel shell and a transparent glass liner, two ends of each sampler are respectively provided with a liquid inlet and a liquid outlet which are communicated with the transparent glass liner, the liquid inlet is connected with a corresponding sampling port on the two-dimensional core model through a pipeline, and the liquid outlet is connected with a valve.
In a specific implementation, the N 2 Gas intermediate containerThe foamer intermediate container, the crude oil intermediate container and the N 2 The gas cylinders are all connected with pressure gauges.
In a specific implementation, a foam generator is disposed between the foamer intermediate container and the six-way valve.
In a specific implementation, the N 2 And a gas flowmeter is arranged between the gas intermediate volume and the six-way valve.
The second aspect of the present invention provides a method for evaluating foam regeneration capability in a two-dimensional core displacement process, which is applied to the apparatus for evaluating foam regeneration capability in a core displacement process according to any one of the implementation manners of the first aspect, and the method includes:
step 1, fully drying a two-dimensional core in a two-dimensional core model, respectively scanning the dry core by using a CT scanner under two scanning voltages to obtain CT values of the two-dimensional core under two energies, and recording scanning positions and scanning conditions;
step 2, setting back pressure, vacuumizing a core of a two-dimensional core model, and then saturating sodium bromide solution, and scanning the two-dimensional core by using a CT scanner under the same two scanning voltages, scanning conditions and scanning positions as in the step 1 to obtain the CT value of the two-dimensional core of the fully saturated sodium bromide solution under two energies;
step 3, saturating crude oil to the two-dimensional core in the two-dimensional core model through a crude oil intermediate container until sodium bromide solution in the two-dimensional core is displaced to a bound water state by the crude oil;
step 4, N is added 2 N in gas intermediate container and foamer intermediate container 2 Generating foam by using gas and foaming agent solution through a foam generator, injecting the generated foam into the two-dimensional core, controlling the gas-liquid ratio to be 2:1, and scanning the two-dimensional core by using a CT scanner under the same two scanning voltages, scanning conditions and scanning positions as those of the step 1 to obtain CT values of the two-dimensional core in the foam seepage process under two energies;
step 5, opening all sampling ports of the two-dimensional core model, and allowing the solution to flow into corresponding samplers;
step 6, detecting and obtaining the foaming agent concentration of the solution in each sampler by adopting a high performance liquid chromatography;
step 7, calculating the saturation of the two-dimensional core by using the CT values of the two-dimensional core obtained in the step 1, the step 2 and the step 4 and respectively adopting saturation formulas of oil, gas and water;
and 8, analyzing the saturation of the obtained oil, gas and water to obtain the ratio of the saturation of the gas and the liquid, and if the ratio of the saturation of the gas and the liquid is smaller than 1:1 or the ratio of the saturation of the gas and the liquid is larger than 5:1, determining that the two-dimensional rock core cannot form stable foam, and the foam regeneration capacity is low in the two-dimensional rock core displacement process.
Optionally, the method further comprises:
and 9, if the ratio of the gas-liquid saturation is between 1:1 and 5:1, detecting the concentration of the foaming agent obtained by the fluid in the sampler by using a high performance liquid chromatography, preparing a foaming agent solution, adding crude oil with corresponding saturation into the foaming agent solution, stirring and foaming, and simulating a foam regeneration process under stratum conditions.
Step 10, under the same two scanning voltages and scanning conditions as in step 1, scanning the core by adopting a CT scanner at different moments and different positions of two-dimensional core displacement to obtain a CT value of the two-dimensional core, and calculating the corresponding saturation of the two-dimensional core under each condition by adopting an oil, gas and water saturation formula;
and 11, sampling fluid in the core at different moments of the two-dimensional core displacement to obtain the activity of the foaming agent at different moments at different positions in the two-dimensional core displacement process.
Optionally, the concentration of the sodium bromide solution ranges from 4wt% to 8wt%.
According to the method and the device for evaluating the foam regeneration capability in the two-dimensional core displacement process, the three-phase fluid saturation in the two-dimensional core displacement process is obtained through the CT dual-energy synchronous scanning method, the effective concentration of the foaming agent can be detected on the solution sample in the sampler by utilizing the high-performance liquid chromatography, the foaming agent solution with the corresponding effective concentration is prepared, the foaming capability of the foaming agent solution under different oil saturation conditions is evaluated through the stirring method, and then the foam regeneration capability in the two-dimensional core displacement process is evaluated. The invention evaluates the regeneration capability of the foam at different positions and different moments under the condition of considering the saturation of the fluid in the stratum, does not apply numerical simulation, and can truly reflect the experimental true value.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it will be obvious that the drawings in the following description are some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
FIG. 1 is a schematic structural diagram of an evaluation device for foam regeneration capability in a two-dimensional core displacement process;
FIG. 2 is a flowchart of an embodiment of a method for evaluating foam regeneration capability in a two-dimensional core displacement process according to the present invention;
fig. 3 is a flowchart of a second embodiment of a method for evaluating foam regeneration capability in a two-dimensional core displacement process.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 is a schematic structural diagram of an evaluation device for foam regeneration capability in a two-dimensional core displacement process, and as shown in fig. 1, the evaluation device for foam regeneration capability in a core displacement process comprises:
the two-dimensional core model 9, wherein a plurality of sampling ports 8 with equal intervals are formed in one side of the two-dimensional core model 9, and each sampling port 8 is connected with one sampler 10; two-dimensional rock cores with different particle sizes can be filled in the two-dimensional rock core model 9; each sampler 10 is used for collecting core fluid at the position of the corresponding sampling port 8;
one end of the two-dimensional core model 9 is connected with a six-way valve 7, and the other end of the six-way valve 7 is respectively connected with the crude oil intermediate container 2, the foaming agent intermediate container 3 and N 2 A gas intermediate container 4; the other end of the two-dimensional core model 9 is connected with a back pressure valve 11, and the back pressure valve 11 is respectively connected with N 2 The gas cylinder 13 is connected with the produced fluid container 12;
and the CT scanner 14 is connected with the two-dimensional core model 9 and is used for scanning CT values of the two-dimensional core under different voltages and different conditions.
In a specific implementation of the device, a gap-shaped cavity with a smaller distance is formed between the front side and the rear side of the two-dimensional core model 9, and the gap-shaped cavity is used for filling core materials with different particle sizes when the two-dimensional core is evaluated, namely, the core materials pass through the cavity to be limited into a two-dimensional plane.
Specifically, two ends of the inlet end and the outlet end of the shell of the two-dimensional core model 9 are respectively provided with a threaded interface, and the inlet end of the shell is connected with the six-way valve 7 through the threaded interfaces; the outlet section of the housing is connected to the back pressure valve 11 by a threaded connection.
The crude oil intermediate vessel 2, the foaming agent intermediate vessel 3 and the N 2 The gas intermediate containers 4 are respectively provided with a advection pump 1, and the advection pumps 1 are used for inputting the fluid in the corresponding intermediate container into the two-dimensional core model 9 through the six-way valve 7.
Preferably, the crude oil intermediate container 2, the N 2 Pistons are arranged in the gas intermediate container 4 and the foaming agent intermediate container 3, and a advection pump 1 connected with each intermediate container can push the pistons to move so as to enable fluid in the container to enter the two-dimensional core model 9.
In specific implementation, each sampler 10 comprises a stainless steel shell and a transparent glass liner, two ends of each sampler 10 are respectively provided with a liquid inlet and a liquid outlet which are communicated with the transparent glass liner, the liquid inlet is connected with a corresponding sampling port 8 on the two-dimensional core model 9 through a pipeline, and the liquid outlet is connected with a valve.
To control the pressure of the fluid input, the N 2 Gas intermediate vessel 4, foaming agent intermediate vessel 3, crude oil intermediate vessel 2 and N 2 The gas cylinders 13 are connected with pressure gauges P.
In order to be able to foam the foaming agent sufficiently, a foam generator 6 is arranged between the foaming agent intermediate container 3 and the six-way valve 7.
And, in order to control the input condition of the fluid, the N is 2 A gas flow meter 5 is arranged between the gas intermediate volume 4 and the six-way valve 7.
In the above-mentioned scheme, the two-dimensional core model 9 includes a planar cavity with a smaller thickness, that is, a slit-shaped cavity with a smaller distance between the front and rear opposite sides, where quartz sand with different particle diameters can be filled to form a layer of core to be evaluated with a smaller thickness, for example: the cavity of the two-dimensional core model 9 can be rectangular or square. As shown in fig. 1, one side of the two-dimensional core model 9 is provided with equidistant sampling ports 8, each sampling port 8 is connected with a corresponding sampler 10 for collecting core fluid at the position, then a high performance liquid chromatography (High Performance Liquid Chromatography, HPLC) is used for detecting the effective concentration of a foaming agent for a solution sample in the sampler 10, foaming agent solutions with the corresponding effective concentration are prepared, the foaming capability of the foaming agent solutions under different oil saturation conditions is evaluated by a stirring method, and then the foam regeneration capability in the two-dimensional core displacement process is evaluated. One end of the two-dimensional core model 9 is connected with a six-way valve 7, saturated water, saturated oil and foam are respectively driven into the two-dimensional core by the advection pump 1 through the intermediate container 2, the intermediate container 3 and the intermediate container 4, and the other end of the two-dimensional core is provided with a back pressure valve 11 and produced liquid 12. Crude oil intermediate container 2, foamer intermediate container 3 and N 2 All in the gas intermediate container 4A piston with a volume of 1L is provided, and the connected advection pump 1 can push the piston to move so as to enable fluid to enter the two-dimensional core model 9. The two-dimensional core model 9 comprises a top surface and a side surface, wherein a plurality of equidistant sampling ports 8 are formed in the side surface of the two-dimensional core model 9, the sampling ports 8 are communicated with a core in the two-dimensional core model 9, and each sampling port 8 is respectively connected with a sampler 10 through a pipeline with a valve.
The sampler 10 comprises a cylindrical stainless steel shell and a transparent glass liner, wherein two ends of the sampler 10 are respectively provided with a liquid inlet and a liquid outlet which are communicated with the transparent glass liner, the liquid inlet is connected with the two-dimensional core sampling port 8 through a pipeline, and one end of the liquid outlet is connected with a valve. Crude oil intermediate container 2, foamer intermediate container 3, N 2 Gas intermediate container 4 and N 2 The gas cylinders 13 are connected with pressure gauges, and the measuring range of the pressure gauges is 16MPa.
According to the device for evaluating the foam regeneration capacity in the two-dimensional core displacement process, each sampling port is connected with a corresponding sampler and used for collecting core fluid at the position, then the high-performance liquid chromatography is used for detecting the effective concentration of the foaming agent on the solution sample in the sampler, foaming agent solutions with the corresponding effective concentration are prepared, the foaming capacity of the foaming agent solutions under different oil saturation conditions is evaluated through a stirring method, and then the foam regeneration capacity in the two-dimensional core displacement process is evaluated.
Fig. 2 is a flowchart of an embodiment of a method for evaluating foam regeneration capability in a two-dimensional core displacement process, and as shown in fig. 2, the method is mainly applied to an apparatus for evaluating foam regeneration capability in a two-dimensional core displacement process shown in fig. 1, and specifically comprises the following implementation steps:
and step 1, fully drying a two-dimensional core in a two-dimensional core model, respectively scanning the dry core by using a CT scanner under two scanning voltages to obtain CT values of the two-dimensional core under two energies, and recording scanning positions and scanning conditions.
In this step, the core to be evaluated is put into a two-dimensional core model in advance and dried, and then CT scan is performed according to two preset voltages, for example: and (3) scanning the dry core under two scanning voltages of 60kV and 100kV respectively to obtain CT values of the dry core under two energies, and recording scanning positions and scanning conditions.
And 2, setting back pressure, vacuumizing the core of the two-dimensional core model, and then, saturating the sodium bromide solution, and scanning the two-dimensional core by using a CT scanner under the same two scanning voltages, scanning conditions and scanning positions as in the step 1 to obtain the CT value of the two-dimensional core of the fully saturated sodium bromide solution under two energies.
In this step, the back pressure can be configured, in a specific implementation manner, after the back pressure of 2MPa is set, the core of the two-dimensional core model 9 is vacuumized and then saturated with sodium bromide solution, the concentration of the sodium bromide solution is 6wt%, and the core is scanned under the same two scanning voltages, scanning conditions and scanning positions as in the step 1, so as to obtain the core CT value of the fully saturated sodium bromide solution under two energies.
Preferably, the concentration of the sodium bromide solution ranges from 4wt% to 8wt%.
And 3, saturating the crude oil to the two-dimensional core in the two-dimensional core model through a crude oil intermediate container until the sodium bromide solution in the two-dimensional core is displaced to a bound water state by the crude oil.
Step 4, N is added 2 N in gas intermediate container and foamer intermediate container 2 The gas and foaming agent solution generate foam through a foam generator, the generated foam is injected into the two-dimensional core, the gas-liquid ratio is controlled to be 2:1, and under the same two scanning voltages, scanning conditions and scanning positions as those of the step 1, a CT scanner is used for scanning the two-dimensional core, so that CT values of the two-dimensional core in the foam seepage process under two energies are obtained.
In this step, N 2 The gas and the foaming agent solution generate foam through a foam generator 6, the generated foam is injected into a two-dimensional core model 9, the pumping speed of the foaming agent solution is controlled through a advection pump 1, and N is controlled through a gas flowmeter 5 2 The flow rate of the gas is such that the gas-liquid ratio of the injected foam is 2:1, and the gas-liquid ratio is controlled by the same two scanning voltages, scanning conditions and scanning positions as those in the step 1And scanning the core to obtain core CT values in the foam seepage process under two energies.
And 5, opening all sampling ports of the two-dimensional core model, and allowing the solution to flow into corresponding samplers.
And 6, detecting and obtaining the foaming agent concentration of the solution in each sampler by adopting a high performance liquid chromatography.
In this step, the valve before the sampler 10 is closed, the solution in the sampler 10 is poured into a sample bottle, and after the foamer solution is separated from the crude oil, the foamer concentration of the fluid in the sampler 10 is detected by HPLC.
And 7, calculating the saturation of the two-dimensional core by using the CT values of the two-dimensional core obtained in the steps 1, 2 and 4 and respectively adopting saturation formulas of oil, gas and water.
And 8, analyzing the saturation of the obtained oil, gas and water to obtain the ratio of the saturation of the gas and the liquid, and if the ratio of the saturation of the gas and the liquid is smaller than 1:1 or the ratio of the saturation of the gas and the liquid is larger than 5:1, determining that the two-dimensional rock core cannot form stable foam, and the foam regeneration capacity is low in the two-dimensional rock core displacement process.
In the step, the three-phase saturation is analyzed, if the ratio of the gas-liquid saturation is smaller than 1:1 or larger than 5:1, stable foam cannot be formed, the foam regeneration capability is poor in the core displacement process, and the evaluation of the foam regeneration capability in the two-dimensional core (namely, the two-dimensional core) displacement process is completed.
According to the method for evaluating the foam regeneration capability in the two-dimensional core displacement process, the three-phase fluid saturation in the core displacement process is obtained through the CT dual-energy synchronous scanning method, foam can be formed under the action of the foaming agent only when the gas phase saturation is within a certain range, the effective concentration of the foaming agent can be detected on a solution sample in a sampler by utilizing the high performance liquid chromatography, foaming agent solutions with the corresponding effective concentration are prepared, the foaming capability of the foaming agent solutions under different oil saturation conditions is evaluated through the stirring method, and then the foam regeneration capability in the core displacement process is evaluated. The regeneration capability of the foam at different positions and different moments is evaluated under the condition of considering the saturation of the fluid in the stratum, numerical simulation is not applied, less assumption is provided, and the true value of the experiment can be truly reflected.
Fig. 3 is a flowchart of a second embodiment of a method for evaluating foam regeneration capability in a two-dimensional core displacement process. As shown in fig. 3, on the basis of the first embodiment, if the ratio of the gas-liquid saturation is between 1:1 and 5:1, the analysis process needs to be continued, that is, the method further includes the following steps:
and 9, if the ratio of the gas-liquid saturation is between 1:1 and 5:1, detecting the concentration of the foaming agent obtained by the fluid in the sampler by using a high performance liquid chromatography, preparing a foaming agent solution, adding crude oil with corresponding saturation into the foaming agent solution, stirring and foaming, and simulating a foam regeneration process under stratum conditions.
And step 10, under the same two scanning voltages and scanning conditions as in the step 1, scanning the core by adopting a CT scanner at different moments and different positions of two-dimensional core displacement to obtain a CT value of the two-dimensional core, and calculating the corresponding saturation of the two-dimensional core under each condition by adopting an oil, gas and water saturation formula.
And 11, sampling fluid in the core at different moments of the two-dimensional core displacement to obtain the activity of the foaming agent at different moments at different positions in the two-dimensional core displacement process.
In both of the above examples, the concentration of the sodium bromide solution ranged from 4wt% to 8wt%.
In the above two embodiments, the saturation of the two-dimensional core needs to be calculated according to the CT value of the two-dimensional core and by adopting the saturation formulas of oil, gas and water, and the specific calculation mode is provided in this scheme:
the saturation calculation formula of oil, gas and water is as follows:
the saturation formula of water is:
the saturation formula of the oil is:
the saturation formula of the gas:
wherein S is g Is the saturation of the gas; s is S w Is the saturation of water; s is S o Is the saturation of the oil; CT (computed tomography) E1dry Is E 1 CT value of dry core under energy; CT (computed tomography) E2dry Is E 2 CT value of dry core under energy; CT (computed tomography) E1waterwet Is E 1 Rock CT value of fully saturated water under energy; CT (computed tomography) E2waterwet Is E 2 Rock CT value of fully saturated water under energy; CT (computed tomography) E1g Is E 1 CT value of gas under energy CT E2g Is E 2 CT value of the gas under energy; CT (computed tomography) E1w Is E 1 CT value of energy launch; CT (computed tomography) E2w Is E 2 CT value of energy launch; CT (computed tomography) E1o Is E 1 CT value of oil under energy; CT (computed tomography) E2o Is E 2 CT value of oil under energy; and the above formula satisfies S g +S w +S o ＝1。
The corresponding saturation of the two-dimensional core under each condition can be calculated through the formula, and then the foam regeneration capability of the two-dimensional core is evaluated.
According to the method provided by the first embodiment and the second embodiment, the three-phase fluid saturation in the two-dimensional core displacement process is obtained through the CT dual-energy synchronous scanning method, foam formation is only possible under the action of a foaming agent within a certain range, the effective concentration of the foaming agent can be detected on a solution sample in a sampler by utilizing the high performance liquid chromatography, foaming agent solutions with the corresponding effective concentration are prepared, the foaming capability of the foaming agent solutions under different oil saturation conditions is evaluated through a stirring method, further the foam regeneration capability in the two-dimensional core displacement process is evaluated, the influence of the saturation of the fluid on the foaming agent performance and the foam regeneration capability in the core displacement process is considered, and the foam regeneration capability in the core displacement process can be truly and effectively evaluated.
Those of ordinary skill in the art will appreciate that: all or part of the steps for implementing the method embodiments described above may be performed by hardware associated with program instructions. The foregoing program may be stored in a computer readable storage medium. The program, when executed, performs steps including the method embodiments described above; and the aforementioned storage medium includes: read-only memory (ROM), RAM, flash memory, hard disk, solid state disk, magnetic tape, floppy disk, optical disk, and any combination thereof.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (7)
1. An evaluation device of foam regeneration ability in two-dimensional rock core displacement process, which is characterized by comprising:
the two-dimensional rock core model is characterized in that one side of the two-dimensional rock core model is provided with a plurality of equidistant sampling ports, and each sampling port is connected with one sampler; two-dimensional rock cores with different particle sizes can be filled in the two-dimensional rock core model; each sampler is used for collecting core fluid at the position of a corresponding sampling port;
one end of the two-dimensional core model is connected with a six-way valve, and the other end of the six-way valve is respectively connected with a crude oil intermediate container, a foaming agent intermediate container and N 2 A gas intermediate container; the other end of the two-dimensional core model is connected with a back pressure valve which is respectively connected with N 2 The gas cylinder is connected with the produced liquid container; a foam generator is arranged between the foaming agent intermediate container and the six-way valve;
the crude oil intermediate vessel, the foamer intermediate vessel, and the N 2 The gas intermediate containers are respectively provided with a advection pump, and the advection pumps are used for inputting the fluid in the corresponding intermediate container into the two-dimensional core model through the six-way valve;
and the CT scanner is connected with the two-dimensional core model and is used for scanning CT values of the two-dimensional core under different voltages and different conditions.
2. The apparatus of claim 1, wherein the crude intermediate vessel, the N 2 And pistons are arranged in the gas intermediate containers and the foaming agent intermediate containers, and a advection pump connected with each intermediate container can push the pistons to move so as to enable fluid in the containers to enter the two-dimensional core model.
3. The device of claim 1, wherein each sampler comprises a stainless steel shell and a transparent glass liner, two ends of each sampler are respectively provided with a liquid inlet and a liquid outlet which are communicated with the transparent glass liner, the liquid inlet is connected with a corresponding sampling port on the two-dimensional core model through a pipeline, and the liquid outlet is connected with a valve.
4. A device according to any one of claims 1 to 3, wherein N 2 Gas intermediate vessel, said foamer intermediate vessel, said crude oil intermediate vessel, and said N 2 The gas cylinders are all connected with pressure gauges.
5. A device according to any one of claims 1 to 3, wherein said N 2 And a gas flowmeter is arranged between the gas intermediate volume and the six-way valve.
6. A method for evaluating foam regeneration capability in a two-dimensional core displacement process, which is applied to the device for evaluating foam regeneration capability in a two-dimensional core displacement process as claimed in any one of claims 1 to 5, the method comprising:
step 1, fully drying a two-dimensional core in a two-dimensional core model, respectively scanning the dry core by using a CT scanner under two scanning voltages to obtain CT values of the two-dimensional core under two energies, and recording scanning positions and scanning conditions;
step 2, setting back pressure, vacuumizing a core of a two-dimensional core model, and then saturating sodium bromide solution, and scanning the two-dimensional core by using a CT scanner under the same two scanning voltages, scanning conditions and scanning positions as in the step 1 to obtain the CT value of the two-dimensional core of the fully saturated sodium bromide solution under two energies;
step 3, saturating crude oil to the two-dimensional core in the two-dimensional core model through a crude oil intermediate container until sodium bromide solution in the two-dimensional core is displaced to a bound water state by the crude oil;
step 4, N is added 2 N in gas intermediate container and foamer intermediate container 2 Generating foam by using gas and foaming agent solution through a foam generator, injecting the generated foam into the two-dimensional core, controlling the gas-liquid ratio to be 2:1, and scanning the two-dimensional core by using a CT scanner under the same two scanning voltages, scanning conditions and scanning positions as those of the step 1 to obtain CT values of the two-dimensional core in the foam seepage process under two energies;
step 5, opening all sampling ports of the two-dimensional core model, and allowing the solution to flow into corresponding samplers;
step 6, detecting and obtaining the foaming agent concentration of the solution in each sampler by adopting a high performance liquid chromatography;
step 7, calculating the saturation of the two-dimensional core by using the CT values of the two-dimensional core obtained in the step 1, the step 2 and the step 4 and respectively adopting saturation formulas of oil, gas and water;
and 8, analyzing the saturation of the obtained oil, gas and water to obtain the ratio of the saturation of the gas and the liquid, and if the ratio of the saturation of the gas and the liquid is smaller than 1:1 or the ratio of the saturation of the gas and the liquid is larger than 5:1, determining that the two-dimensional rock core cannot form stable foam, and the foam regeneration capacity is low in the two-dimensional rock core displacement process.
7. The method of claim 6, wherein the method further comprises:
step 9, if the ratio of the gas-liquid saturation is between 1:1 and 5:1, detecting the concentration of the foaming agent obtained by the fluid in the sampler by using a high performance liquid chromatography, preparing a foaming agent solution, adding crude oil with corresponding saturation into the foaming agent solution, stirring and foaming, and simulating a foam regeneration process under stratum conditions;
step 10, under the same two scanning voltages and scanning conditions as in step 1, scanning the core by adopting a CT scanner at different moments and different positions of two-dimensional core displacement to obtain a CT value of the two-dimensional core, and calculating the corresponding saturation of the two-dimensional core under each condition by adopting an oil, gas and water saturation formula;
and 11, sampling fluid in the core at different moments of the two-dimensional core displacement to obtain the activity of the foaming agent at different moments at different positions in the two-dimensional core displacement process.
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