CN111157073B - Method and system for measuring retention information of polymer solution in porous medium - Google Patents
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- 229920000642 polymer Polymers 0.000 title claims abstract description 220
- 230000014759 maintenance of location Effects 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims abstract description 71
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 170
- 239000011148 porous material Substances 0.000 claims abstract description 160
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims abstract description 59
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 59
- 239000011737 fluorine Substances 0.000 claims abstract description 59
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 56
- 239000012530 fluid Substances 0.000 claims abstract description 26
- 238000003556 assay Methods 0.000 claims abstract description 12
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- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 24
- 229910052753 mercury Inorganic materials 0.000 claims description 24
- 230000000717 retained effect Effects 0.000 claims description 22
- 238000006243 chemical reaction Methods 0.000 claims description 18
- 238000006073 displacement reaction Methods 0.000 claims description 17
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- 238000000655 nuclear magnetic resonance spectrum Methods 0.000 claims 1
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- OKIIEJOIXGHUKX-UHFFFAOYSA-L Cadmium iodide Inorganic materials [Cd+2].[I-].[I-] OKIIEJOIXGHUKX-UHFFFAOYSA-L 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
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- G01F22/00—Methods or apparatus for measuring volume of fluids or fluent solid material, not otherwise provided for
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N24/00—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects
- G01N24/08—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects by using nuclear magnetic resonance
- G01N24/081—Making measurements of geologic samples, e.g. measurements of moisture, pH, porosity, permeability, tortuosity or viscosity
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Abstract
The invention relates to the technical field of oilfield development and discloses a method and a system for determining retention information of a polymer solution in a porous medium. The assay method comprises: displacing saturated standard water in the porous medium by using fluorine oil, and measuring the bound water pore volume of the porous medium under the condition that the oil content of the first produced fluid is up to the preset percent oil content; displacing the fluorine oil by using a polymer solution until the retention of the polymer solution in the porous medium is saturated; displacing the polymer solution in the porous medium by using the fluorine oil, and measuring the sum of the pore volume of the bound water and the retention volume of the polymer solution in the porous medium under the condition that the polymer-containing rate of the second produced fluid is as low as the preset percentage polymer-containing rate; and determining the retention of the polymer solution in the porous medium based on the bound water pore volume and the sum of the bound water pore volume and the retention volume of the polymer solution. The invention can accurately carry out quantitative characterization on the retention of the polymer solution in the porous medium.
Description
Technical Field
The invention relates to the technical field of oilfield development, in particular to a method and a system for measuring retention information of a polymer solution in a porous medium.
Background
The chemical flooding technology for increasing the recovery ratio is the main technology for increasing the recovery ratio of crude oil in China, and the annual oil yield of the chemical flooding technology exceeds 1500 multiplied by 104Ton. Chemical flooding generally refers to polymer solution flooding, polymer solution/surfactant binary combination flooding, and polymer solution/surfactant/alkali ternary combination flooding, all of which contain water-soluble high-molecular polymer solutions. The polymer solution can increase the viscosity of a water phase, improve the oil-water fluidity ratio, and increase the seepage resistance of a displacement medium by the adsorption and retention of the polymer solution in a stratum, thereby enlarging the swept volume and relieving the heterogeneity of an oil reservoir. Thus, polymerizationThe determination of the adsorption retention of the solution in the reservoir, particularly the determination of the adsorption retention of the polymer solution in each pore throat size interval of rock pores, is an important problem for improving the recovery efficiency of chemical flooding and also an important basis for designing a chemical flooding scheme.
At present, the determination of the adsorption of a polymer solution through an indoor experiment is a main way for determining the adsorption condition of the polymer solution in a reservoir, and the determination of the indoor experiment mainly comprises a static adsorption test and a dynamic adsorption test. Static adsorption means adding a solid adsorbent into a certain amount of chemical agent solution with known concentration, and measuring the concentration change of the chemical agent solution after adsorption equilibrium; the dynamic adsorption means that the chemical agent solution is circulated in a closed system and passes through solid adsorption to reach adsorption equilibrium, and then the concentration change of the chemical agent solution is measured. In any of the above methods, the concentration change of the polymer solution before and after adsorption is measured, and the concentration measurement method of the polymer solution includes a starch-cadmium iodide detection method, a turbidity method, a viscosity method, a fluorescence spectrophotometry, a chromatography method, and the like. However, these methods all need to draw a standard curve, the testing process is complicated, and especially, the molecular morphology of the residual polymer solution after the polymer solutions of different types are sheared by the porous medium is different, so that the testing result is deviated, and the failure rate is high; meanwhile, the methods cannot quantitatively obtain the adsorption retention amount of the polymer solution in pore intervals with different sizes of the rock core, namely the retention position of the polymer solution cannot be determined.
Disclosure of Invention
The invention aims to provide a method and a system for measuring retention information of a polymer solution in a porous medium, which can simply and accurately carry out quantitative characterization on the adsorption retention of the polymer solution in the porous medium.
In order to achieve the above object, a first aspect of the present invention provides a method for measuring retention information of a polymer solution in a porous medium, the method comprising: displacing saturated standard water in the porous medium by using fluorine oil, and measuring the bound water pore volume of the porous medium under the condition that the oil content of first produced liquid obtained in the process of displacing the saturated standard water by using the fluorine oil is up to a preset percent oil content; displacing the fluorine oil with the polymer solution until the retention of the polymer solution in the porous medium reaches a saturated state; displacing the polymer solution retained in the porous medium with the fluorine oil, and measuring the sum of the bound water pore volume of the porous medium and the retention volume of the polymer solution in the porous medium in a state that the polymer-containing rate of a second produced fluid obtained in the process of displacing the polymer solution with the fluorine oil is as low as a preset percentage polymer-containing rate; and determining the hold up of the polymer solution in the porous medium based on the bound water pore volume of the porous medium and the sum of the bound water pore volume and the hold up volume of the polymer solution in the porous medium.
Preferably, before displacing the saturated standard water in the porous medium with the fluorine oil, the determination method further comprises: injecting standard water into the porous medium, and determining the pore volume of the porous medium when the standard water in the porous medium is saturated; measuring a third nuclear magnetic resonance image of the porous medium at saturation of the standard water in the porous medium; and determining the intensity of a nuclear magnetic resonance peak corresponding to a unit pore volume based on the pore volume of the porous medium and the third nuclear magnetic resonance map.
Preferably, before displacing the saturated standard water in the porous medium with the fluorine oil, the determination method further comprises: injecting standard water into the porous medium; applying preset confining pressure to a clamping device where the porous medium is located and continuously injecting the standard water when the standard water in the porous medium is saturated; measuring a fourth NMR chart of the porous medium after a preset time period; and determining the pore volume of the porous medium and the intensity of a nuclear magnetic resonance peak corresponding to the unit pore volume based on the fourth nuclear magnetic resonance image.
Preferably, said measuring the bound water pore volume of said porous medium comprises: measuring a first nuclear magnetic resonance image of the porous medium in a state where the oil content of the first produced fluid is up to a preset percent oil content; and determining a bound water pore volume of the porous medium based on the first nmr map and the intensity of the nmr peak corresponding to a unit pore volume. And, said measuring the sum of said bound water pore volume of said porous medium and the hold-up volume of said polymer solution in said porous medium comprises: measuring a second nmr plot of the porous medium at a polymer content of the second production fluid as low as a predetermined percentage polymer content; and determining the sum of the bound water pore volume of the porous medium and the hold-up volume of the polymer solution in the porous medium based on the second nmr map and the intensity of the nmr peak corresponding to unit pore volume.
Preferably, the assay method further comprises: determining first distribution information of the standard water in the porous medium within different transverse relaxation times based on the third nuclear magnetic resonance image or the fourth nuclear magnetic resonance image; determining second distribution information of the polymer solution in the porous medium within different transverse relaxation times based on the first nuclear magnetic resonance image and the second nuclear magnetic resonance image; and determining retention information of the polymer solution in the porous medium in different preset pore size intervals based on the first distribution information, the mercury intrusion curve of the porous medium and the second distribution information.
Preferably, the determining retention information of the polymer solution within the porous medium in different preset pore size intervals comprises: determining first cumulative distribution information of the standard water within the porous medium over different transverse relaxation times based on the first distribution information; determining second cumulative distribution information of mercury within the porous medium within different pore sizes based on the mercury intrusion curve; determining a conversion coefficient from a transverse relaxation time to a pore size based on the first cumulative distribution information and the second cumulative distribution information; and determining retention information of the polymer solution in the porous medium in different preset pore size intervals based on the determined conversion coefficient and the second distribution information.
Preferably, the determining a conversion factor from transverse relaxation time to pore size comprises: matching a peak pattern of the first cumulative distribution information and a peak pattern of the second cumulative distribution information to determine a conversion coefficient from a transverse relaxation time to a pore size.
Preferably, before displacing the fluorine oil with the polymer solution, the measuring method further comprises: and displacing the fluorine oil by using the standard water until the water content of a third produced liquid obtained in the process of displacing the fluorine oil by using the standard water reaches a state of preset percentage water content.
In a second aspect, the present invention provides an assay system for retention information of a polymer solution in a porous medium, the assay system comprising: the first measuring device is used for displacing saturated standard water in the porous medium by using fluorine oil, and measuring the bound water pore volume of the porous medium under the condition that the oil content of first produced liquid obtained in the process of displacing the saturated standard water by using the fluorine oil is up to a preset percent oil content; a first displacement device for displacing the fluorine oil with the polymer solution until a retention amount of the polymer solution in the porous medium reaches a saturated state; a second measuring device for displacing the polymer solution retained in the porous medium with the fluorine oil, and measuring a sum of the bound water pore volume of the porous medium and a retained volume of the polymer solution in the porous medium in a state where a polymer-containing rate of a second produced fluid obtained during the displacement of the polymer solution with the fluorine oil is as low as a preset percentage polymer-containing rate; and first determining means for determining the hold up of the polymer solution in the porous medium based on the bound water pore volume of the porous medium and the sum of the bound water pore volume and the hold up volume of the polymer solution in the porous medium.
Preferably, the assay system further comprises: second determining means for injecting standard water into the porous medium and determining a pore volume of the porous medium when the standard water in the porous medium reaches a saturated state; a third measuring device for measuring a third nuclear magnetic resonance image of the porous medium at a state where the standard water in the porous medium is saturated; and third determining means for determining the intensity of a nuclear magnetic resonance peak corresponding to a unit pore volume based on the pore volume of the porous medium and the third nuclear magnetic resonance map.
Preferably, the first measuring device includes: the first measurement module is used for measuring a first nuclear magnetic resonance image of the porous medium under the condition that the oil content of the first produced fluid is up to the preset percent oil content; and a first determination module for determining a bound water pore volume of the porous medium based on the first nuclear magnetic resonance map and an intensity of the nuclear magnetic resonance peak corresponding to a unit pore volume, and the second measurement device includes: a second measurement module for measuring a second NMR of the porous medium at a polymer content of the second production fluid as low as a predetermined percentage polymer content; and a second determination module for determining a sum of the bound water pore volume of the porous medium and a hold-up volume of the polymer solution in the porous medium based on the second nuclear magnetic resonance map and an intensity of the nuclear magnetic resonance peak corresponding to a unit pore volume.
Preferably, the fourth determining means is configured to determine first distribution information of the standard water in the porous medium within different transverse relaxation times based on the third nuclear magnetic resonance image or the fourth nuclear magnetic resonance image; fifth determining means for determining second distribution information of the polymer solution within the porous medium within different transverse relaxation times based on the first nmr chart and the second nmr chart; and a sixth determining device, configured to determine retention information of the polymer solution in different preset pore size intervals in the porous medium based on the first distribution information, the mercury intrusion curve of the porous medium, and the second distribution information.
Through the technical scheme, in the process of creatively adopting the fluorine oil to displace the saturated standard water, the pore volume of the bound water of the porous medium is measured when the oil content of the produced fluid is increased to the preset percentage oil content; then measuring the sum of the bound water pore volume of the porous medium and the polymer solution retention volume in the porous medium when the polymer-containing rate of the production fluid is reduced to a preset percentage polymer-containing rate during the process of displacing the polymer solution retained in the porous medium with the fluoro-oil after displacing the fluoro-oil with the polymer solution and the polymer solution is saturated in the porous medium; and finally determining the retention of the polymer solution in the porous medium. Therefore, the method breaks through the traditional thought that the retention of the polymer solution in the porous medium is reversely pushed by measuring the concentration of the polymer solution in the produced liquid, and directly detects the adsorption retention volume of the polymer solution in the porous medium by taking the porous medium as a research target, so that the quantitative characterization of the adsorption retention of the polymer solution in the porous medium can be simply and accurately carried out.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart of a method for determining retention information of a polymer solution in a porous medium according to an embodiment of the present invention;
FIG. 2 is a diagram of an apparatus for determining retention information of a polymer solution in a porous medium according to an embodiment of the present invention;
FIG. 3 is a nuclear magnetic resonance image of a core at various displacement stages provided by an embodiment of the present disclosure;
FIG. 4 is a flow chart providing quantitative characterization of retention information of a polymer solution in different pore size intervals of a porous medium according to one embodiment of the present invention;
FIG. 5 is a graph illustrating the distribution and cumulative distribution of saturated standard water in a core with different transverse relaxation times, according to an embodiment of the present invention;
FIG. 6 is a graph of mercury distribution and cumulative distribution in different pore sizes in a core according to an embodiment of the present invention;
FIG. 7 is a NMR chart of a polymer solution retained in a core according to an embodiment of the invention; and
fig. 8 is a structural diagram of a system for measuring retention information of a polymer solution in a porous medium according to an embodiment of the present invention.
Description of the reference numerals
10 first measuring device 20 first displacement device
30 second measuring means 40 first determining means
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Fig. 1 is a flowchart of a method for determining retention information of a polymer solution in a porous medium according to an embodiment of the present invention. The porous medium can be a natural core (which may be referred to as a core herein for short) with characteristic parameters matched with the permeability and/or porosity of a formation of an experimental purpose, and the core can be subjected to oil washing treatment by using an extraction device in advance and dried to remove crude oil and moisture in the porous medium. And performing nuclear magnetic resonance scanning on the rock core to obtain a nuclear magnetic resonance image of the rock core (which can be used as a background interference image of a subsequent nuclear magnetic spectrum).
As shown in FIG. 1, the method for determining retention information of a polymer solution in a porous medium may include steps S101 to S105.
Step S101, displacing saturated standard water in the porous medium by using fluorine oil, and measuring the bound water pore volume of the porous medium under the condition that the oil content of first produced liquid obtained in the process of displacing the saturated standard water by using the fluorine oil is up to a preset percentage oil content.
In an embodiment, before performing step S101, the determining method may further include: injecting standard water into the porous medium, and determining the pore volume of the porous medium when the standard water in the porous medium is saturated; measuring a third nuclear magnetic resonance image of the porous medium at saturation of the standard water in the porous medium; and determining the intensity of a nuclear magnetic resonance peak corresponding to a unit pore volume based on the pore volume of the porous medium and the third nuclear magnetic resonance map.
Specifically, after the core is weighed to be dry, the core is placed in an intermediate container (not shown), and a certain amount of standard water (for example, distilled water for simulating the mineralization of formation water, hereinafter, referred to simply as distilled water) is added into the intermediate container; and then, after the core is vacuumized for 2 hours by using a vacuum pump (standard water in the core reaches a saturated state), weighing the wet weight of the core, and thus obtaining the saturated water volume (or the pore volume of the core) of the core according to the difference between the dry weight and the wet weight of the core. Then, as shown in fig. 2, a core with saturated standard water may be placed in the core holder 6 and scanned with the nmr scanner 5 to obtain a corresponding nmr chart. Finally, the signal amplitude (i.e., intensity) of the formants in the nmr can be divided by the pore volume of the core to obtain the intensity of the nmr peak per volume of the pore volume.
In another embodiment, before performing step S101, the determining method may further include: injecting standard water into the porous medium; applying preset confining pressure to a clamping device where the porous medium is located and continuously injecting the standard water when the standard water in the porous medium is saturated; measuring a fourth NMR chart of the porous medium after a preset time period; and determining the pore volume of the porous medium and the intensity of a nuclear magnetic resonance peak corresponding to the unit pore volume based on the fourth nuclear magnetic resonance image.
Specifically, the core is placed in an intermediate container (not shown), and a certain amount of standard water (e.g., distilled water) is added to the intermediate container; followed by 2 hours of vacuum pumping (standard water in the core reaches saturation). Next, a core with saturated standard water may be placed in the core holder 6, a confining pressure is applied to the core holder 6 by a confining pressure pump (not shown), the constant flow pump 1 is turned on and the standard water is injected into the core through the piston container 2 to make the saturated water distribution in the core more uniform, and the core is scanned by the nuclear magnetic resonance scanner 5 to obtain a corresponding nuclear magnetic resonance image. The background interference map may then be subtracted from the nmr map to obtain an effective nmr map (e.g., the nmr map corresponding to saturated water in fig. 3), and the envelope of the signal amplitude (i.e., intensity) and transverse relaxation time of the effective nmr map is calculated, which is the pore volume of the core (which is closer to the actual pore volume). Finally, the intensity of the formants in the effective NMR chart is divided by the pore volume of the core to obtain the intensity of the NMR peak per unit volume of the pore volume.
For step S101, measuring the bound water pore volume of the porous medium may comprise: measuring a first nuclear magnetic resonance image of the porous medium in a state where the oil content of the first produced fluid is up to a preset percent oil content; and determining a bound water pore volume of the porous medium based on the first nmr map and the intensity of the nmr peak corresponding to a unit pore volume.
Specifically, the fluorine oil is injected into the rock core entering the rock core holder 6 by using the constant flow pump 1 through the piston container 2, and when the real-time oil content of the produced fluid injected into the measuring cylinder 3 is detected to be 96% or more, the fluorine oil in the rock core reaches a saturated state. The water displaced in the process is the saturated fluorine oil amount in the rock core, and the water retained in the rock core at the moment is the rock core bound water. And simultaneously scanning the rock core to obtain a corresponding nuclear magnetic resonance image. Since the fluorine oil can shield oil phase signals, the acquired nuclear magnetic resonance image is a water phase signal image (namely a rock core bound water signal). Then, the nmr can be subtracted from the background interference pattern to obtain an effective nmr of the core-bound water (e.g., the nmr corresponding to saturated oil in fig. 3), and the intensity of the formants in the effective nmr of the core-bound water is divided by the nmr of the pore volume per unit volume to obtain the bound water pore volume.
And S102, displacing the fluorine oil by using the polymer solution until the retention of the polymer solution in the porous medium reaches a saturated state.
Before performing step S102, the measuring method may further include: and displacing the fluorine oil by using the standard water until the water content of a third produced liquid obtained in the process of displacing the fluorine oil by using the standard water reaches a state of preset percentage water content.
Specifically, distilled water is injected into the rock core through the piston container 2 by using the constant flow pump 1 to carry out a water flooding process, the whole process is continued until the injected distilled water can reach the pore volume of 3 rock cores (namely 3 PV), the real-time water content of the produced liquid injected into the measuring cylinder 3 is detected to be close to 95% or more (approximately in a water saturation state), and then the injection of the distilled water is controlled to be stopped by the control device 4. And simultaneously scanning the core to obtain a corresponding nuclear magnetic resonance image, and subtracting the background interference image from the nuclear magnetic resonance image to obtain an effective nuclear magnetic resonance image (such as the nuclear magnetic resonance image corresponding to water flooding in fig. 3) after water flooding of the fluorine oil. In addition, the water flooding recovery can also be calculated from the amount of oil displaced.
Since the distilled water cannot completely displace the fluorine oil in the core, the fluorine oil remaining in the core is displaced by the polymer solution in step S102, so that the recovery rate of crude oil can be increased. Specifically, a polymer solution is injected into the core by using a constant flow pump 1 and a piston container 2 to perform a polymer solution flooding process, the whole process is continued until the injected polymer solution reaches the pore volume (namely 2 PV) of 2 cores, at the moment, the polymer solution reaches a saturated state of adsorption and retention in the core, and then the injection of the polymer solution is controlled to stop by a control device 4. And simultaneously scanning the rock core to obtain a corresponding nuclear magnetic resonance image, subtracting the background interference image from the nuclear magnetic resonance image to obtain an effective nuclear magnetic resonance image (such as the nuclear magnetic resonance image corresponding to the polymer flooding in figure 3) after the polymer flooding of the fluorine oil, and calculating the recovery ratio improved by the polymer solution according to the newly-expelled oil quantity.
Step S103, displacing the polymer solution retained in the porous medium by using the fluorine oil, and measuring the sum of the bound water pore volume of the porous medium and the retained volume of the polymer solution in the porous medium under the condition that the polymer-containing rate of a second produced fluid obtained in the process of displacing the polymer solution by using the fluorine oil is as low as a preset percentage polymer-containing rate.
For step S103, measuring the sum of the bound water pore volume of the porous medium and the hold-up volume of polymer solution in the porous medium may comprise: measuring a second nmr plot of the porous medium at a polymer content of the second production fluid as low as a predetermined percentage polymer content; and determining the sum of the bound water pore volume of the porous medium and the hold-up volume of the polymer solution in the porous medium based on the second nmr map and the intensity of the nmr peak corresponding to unit pore volume.
Specifically, the fluorine oil is injected into the core by using the constant flow pump 1 through the piston container 2 to perform the oil-flooding polymer solution process, the whole process is continued to the pore volume (2 PV) of 2 cores into which the fluorine oil is injected, at this time, the real-time polymer content of the produced fluid injected into the measuring cylinder 3 is detected to be close to 5% or less (approximately no polymer solution exists), and then the injection of the fluorine oil is controlled to be stopped by the control device 4. Simultaneously scanning the rock core to obtain a nuclear magnetic resonance image of the rock core retaining the polymer solution; the nmr of the core with the polymer solution retained therein may then be subtracted from the background interference map to obtain an effective nmr of the core with the polymer solution retained therein (e.g., the nmr corresponding to oil flooding in fig. 3), and the intensity of the formant in the effective nmr is divided by the nmr of the pore volume per unit volume to obtain the sum of the bound water pore volume and the retained volume of the polymer solution in the core.
Step S104, determining the retention amount of the polymer solution in the porous medium based on the bound water pore volume of the porous medium and the sum of the bound water pore volume and the retention volume of the polymer solution in the porous medium.
Specifically, the retention volume of the polymer solution in the rock core can be obtained by subtracting the bound water pore volume from the sum of the bound water pore volume and the retention volume of the polymer solution in the rock core, and then the retention amount of the polymer solution in the rock core can be obtained by calculating according to the retention volume of the polymer solution in the rock core and the concentration of the polymer solution.
Specifically, the polymer solution used in Daqing oil field industrialization is taken as an example to test the retention amount and the retention position in the displacement process. A common polymer solution (the concentration is 2000mg/L) is selected for the experiment, the natural core is a cylindrical core with the gas permeability of 758mD, the diameter of 2.5cm and the length of 4.5cm, the porosity of the cylindrical core is 23.4%, and the dry weight of the cylindrical core is 41.2 g. The nuclear magnetic scanning of the background and the five online displacement scans are sequentially performed according to the above determination method, and the nuclear magnetic signal spectrum (with the background interference image subtracted) of each displacement stage is obtained, as shown in fig. 2.
The signal quantity corresponding to the unit volume can be calculated through the pore volume (or the saturated standard water volume) of the core and the signal amplitude of nuclear magnetic resonance in a saturated water state, and the signal amplitude corresponding to 1ml of water in the test is 45031. The oil saturation, water flooding recovery, and polymer flooding recovery of the core can also be obtained from the change in signal for each displacement phase, as shown in table 1. For the recovery ratio calculated by using the signal amplitude change and the recovery ratio calculated by measuring cylinder weighing, the goodness of fit of the two is higher.
TABLE 1 comparison of recovery ratio of nuclear magnetic calculations and displacement measurements
The signal value corresponding to the oil-displacing polymer and the signal value corresponding to the saturated oil were subtracted, and the volume of the polymer solution retained was calculated to be 1.83 ml. Since the concentration of the polymer solution was 2000mg/L, the mass of the polymer retained by adsorption was 3.66 mg. The mass of polymer retained was divided by the mass of the core, and the retention ratio of the polymer in the core was calculated to be 0.089 mg/g. Therefore, the method can simply, quickly and accurately test the adsorption retention of the polymer in the rock core, directly takes the rock core as a research object, does not need to carry out a large amount of polymer concentration tests, and is not influenced by the polymer type and the test environment (for example, not influenced by the transparency, concentration, temperature and pH value of a polymer solution).
In addition to determining the retention of the polymer solution in the core, the present invention can also quantitatively determine retention information (hold up to fraction or hold up) of the polymer solution in different pore size intervals of the core.
The method for determining retention information of the polymer solution in the porous medium may further include: and quantitatively representing retention information of the polymer solution in different pore size intervals of the porous medium based on nuclear magnetic resonance images and mercury intrusion curves of different displacement stages. Specifically, as shown in fig. 4, the information for quantitatively characterizing the retention of the polymer solution in different pore size intervals of the porous medium may include: step S401, determining first distribution information of the standard water in the porous medium in different transverse relaxation times based on the third nuclear magnetic resonance image or the fourth nuclear magnetic resonance image; step S402, determining second distribution information of the polymer solution in the porous medium in different transverse relaxation times based on the first nuclear magnetic resonance image and the second nuclear magnetic resonance image; and step S403, determining retention information of the polymer solution in the porous medium in different preset pore size intervals based on the first distribution information, the mercury intrusion curve of the porous medium and the second distribution information.
For step S401, the abscissa (i.e., transverse relaxation time) of the nmr is infinitely subdivided, and the ratio of the infinitesimal area corresponding to each transverse relaxation time to the envelope area (pore volume of the core) of the nmr chart is the distribution frequency (i.e., distribution ratio) of the standard water at each transverse relaxation time (or within the infinitesimal interval corresponding thereto), as shown by a curve a in fig. 5.
For step S402, the first nmr map may be subtracted from the second nmr map to obtain an nmr map (as shown in fig. 7) of the polymer solution retained in the porous medium (e.g., core), and then the distribution frequency (i.e., the distribution ratio) of the polymer solution in each transverse relaxation time (or its corresponding infinite interval) may be obtained by a process similar to step S401 (not shown).
Since the process of acquiring the mercury intrusion curve (the distribution frequency of mercury in different pore sizes of the porous medium) of the porous medium is not the main improvement point of the present invention (only used for acquiring the conversion coefficient), it is not described herein again. Curve a in fig. 6 shows the mercury intrusion curve of the core.
Next, in step S403, a conversion coefficient C between two parameters, namely, the transverse relaxation time and the pore size, may be determined according to the first distribution information and the mercury intrusion curve of the porous medium, and then the transverse relaxation time in the second distribution information is converted into the pore size according to the conversion coefficient C, so as to obtain the retention information of the polymer solution in different preset pore size intervals of the porous medium. The preset pore size interval can be divided according to actual needs.
Specifically, the following formula (1) represents the transverse relaxation time T2Relation to specific surface area S/V of pores:
1/T2＝ρ2S/V， (1)
where ρ is2Is the interfacial relaxation coefficient, which is related to the composition of the porous media and the surface properties of the pores.
The following formula (2) represents the relationship between the specific surface area S/V of the pores and the pore size r:
S/V＝Fs/r， (2)
wherein, FsIs a shape factor that varies with the pore model; r is the radius of the pore.
From the above equations (1) and (2), the following equation (3) can be obtained:
order to
Equation (3) can be modified to equation (4):
T2＝C×r， (4)
for a core, the interfacial relaxation coefficient ρ2And shape factor FsIs a constant and therefore C is also a constant. That is, the conversion between the two parameters of transverse relaxation time and pore size can be achieved by the conversion coefficient C.
For step S403, the determining retention information of the polymer solution in the porous medium in different preset pore size intervals comprises: determining first cumulative distribution information of the standard water within the porous medium over different transverse relaxation times based on the first distribution information; determining second cumulative distribution information of mercury within the porous medium within different pore sizes based on the mercury intrusion curve; determining a conversion coefficient from a transverse relaxation time to a pore size based on the first cumulative distribution information and the second cumulative distribution information; and determining retention information of the polymer solution in the porous medium in different preset pore size intervals based on the determined conversion coefficient and the second distribution information. Therefore, the method can accurately perform regional quantitative characterization on the adsorption retention of the polymer solution in the porous medium.
Since mercury is difficult to enter all fine pores even by using a method for measuring a pore structure by high-pressure mercury intrusion, and a large pore part is taken a trade off in mercury intrusion curve calculation, it is difficult to match two cumulative distribution curves in the whole region, mainly to match the degree of matching of the two curves in the large pore part (at a formant), and to pay attention to the fitting of the peak part. Specifically, the determining a conversion factor from transverse relaxation time to pore size may include: matching a peak pattern of the first cumulative distribution information and a peak pattern of the second cumulative distribution information to determine a conversion coefficient from a transverse relaxation time to a pore size.
Specifically, the corresponding cumulative distribution curve (as shown by curve B in fig. 5) is first determined from the distribution curves of standard water in the porous medium (as shown by curve a in fig. 5) over different transverse relaxation times, and similarly determined from the distribution curves of mercury in the porous medium (as shown by curve a in fig. 6) over different pore sizes (as shown by curve B in fig. 6). Next, the cumulative distribution curve B in fig. 5 and the peak pattern of the cumulative distribution curve B in fig. 6 are matched, and the value of C is continuously modified by, for example, the least square method to perform error calculation so that the two cumulative distribution curves coincide as much as possible, thereby determining the value of C (C ═ 7.1). Then, the distribution curves of the polymer solution in the porous medium in different transverse relaxation times are converted into the distribution curves of the polymer solution in the porous medium in different pore sizes through the conversion coefficient C, and the retention ratio (relative content) or retention (absolute content) in different preset pore size intervals is determined according to the converted distribution curves, as shown in table 2.
TABLE 2 retention of polymer solutions in different pores
The method can accurately obtain the retention amount and the retained pore space of the polymer solution in the porous medium, and provides a basis for the design of the dosage of the polymer solution displacement agent. And the seepage rule of the polymer solution in the porous medium can be researched by comparing the adsorption retention amounts of different polymer solutions according to the structural performance of the polymer solution.
In conclusion, in the process of displacing saturated standard water by using the fluorine oil, the pore volume of the bound water of the porous medium is measured when the oil content of the produced fluid is increased to the preset percentage oil content; then measuring the sum of the bound water pore volume of the porous medium and the polymer solution retention volume in the porous medium when the polymer-containing rate of the production fluid is reduced to a preset percentage polymer-containing rate during the process of displacing the polymer solution retained in the porous medium with the fluoro-oil after displacing the fluoro-oil with the polymer solution and the polymer solution is saturated in the porous medium; and finally determining the retention of the polymer solution in the porous medium. Therefore, the method breaks through the traditional thought that the retention of the polymer solution in the porous medium is reversely pushed by measuring the concentration of the polymer solution in the produced liquid, and directly detects the adsorption retention volume of the polymer solution in the porous medium by taking the porous medium as a research target, so that the quantitative characterization of the adsorption retention of the polymer solution in the porous medium can be simply and accurately carried out.
Fig. 8 is a structural diagram of a system for measuring retention information of a polymer solution in a porous medium according to an embodiment of the present invention. As shown in fig. 8, the assay system may include: the first measuring device 10 is used for displacing saturated standard water in the porous medium by using fluorine oil, and measuring the bound water pore volume of the porous medium under the condition that the oil content of first produced liquid obtained in the process of displacing the saturated standard water by using the fluorine oil is up to a preset percent oil content; a first displacement device 20 for displacing the fluorine oil with the polymer solution until a retention amount of the polymer solution in the porous medium reaches a saturated state; a second measuring device 30 for displacing the polymer solution retained in the porous medium with the fluorine oil, and measuring a sum of the bound water pore volume of the porous medium and a retained volume of the polymer solution in the porous medium in a state where a polymer-containing rate of a second produced fluid obtained during the displacement of the polymer solution with the fluorine oil is as low as a preset percentage polymer-containing rate; and first determining means 40 for determining the hold up of said polymer solution in said porous medium based on the sum of said bound water pore volume of said porous medium and its hold up volume with said polymer solution in said porous medium.
Preferably, the assay system further comprises: second determining means (not shown) for injecting standard water into the porous medium and determining a pore volume of the porous medium when the standard water in the porous medium reaches a saturated state; a third measuring device (not shown) for measuring a third nuclear magnetic resonance image of the porous medium at a state where the standard water in the porous medium is saturated; and third determining means (not shown) for determining the intensity of a nuclear magnetic resonance peak corresponding to a unit pore volume based on the pore volume of the porous medium and the third nuclear magnetic resonance map.
Preferably, the first measuring device includes: the first measurement module is used for measuring a first nuclear magnetic resonance image of the porous medium under the condition that the oil content of the first produced fluid is up to the preset percent oil content; and a first determination module for determining a bound water pore volume of the porous medium based on the first nuclear magnetic resonance map and an intensity of the nuclear magnetic resonance peak corresponding to a unit pore volume, and the second measurement device includes: a second measurement module for measuring a second NMR of the porous medium at a polymer content of the second production fluid as low as a predetermined percentage polymer content; and a second determination module for determining a sum of the bound water pore volume of the porous medium and a hold-up volume of the polymer solution in the porous medium based on the second nuclear magnetic resonance map and an intensity of the nuclear magnetic resonance peak corresponding to a unit pore volume.
Preferably, the assay system further comprises: fourth determining means for determining first distribution information of the standard water in the porous medium within different transverse relaxation times based on the third nuclear magnetic resonance image or the fourth nuclear magnetic resonance image; a fifth determining device for determining second distribution information of the polymer solution in the porous medium in different transverse relaxation times based on the first nuclear magnetic resonance image and the second nuclear magnetic resonance image; and a sixth determining device, configured to determine distribution information of the polymer solution in different preset pore size intervals in the porous medium based on the first distribution information, the mercury intrusion curve of the porous medium, and the second distribution information.
The sixth determining means includes: a third determination module for determining first cumulative distribution information of the standard water within the porous medium over different transverse relaxation times based on the first distribution information; a fourth determination module for determining second cumulative distribution information of mercury within the porous medium within different pore sizes based on the mercury intrusion curve; a fifth determination module, configured to determine a conversion coefficient from a transverse relaxation time to a pore size based on the first cumulative distribution information and the second cumulative distribution information; and a sixth determining module, configured to determine retention information of the polymer solution in the porous medium in different preset pore size intervals based on the determined conversion coefficient and the second distribution information.
Preferably, the assay system further comprises: and the second displacement device (not shown) is used for displacing the fluorine oil by adopting the standard water until the water content of third produced liquid obtained in the process of displacing the fluorine oil by adopting the standard water reaches the state of preset percentage water content.
Preferably, the assay system further comprises: a first injection means (not shown) for injecting standard water into the porous medium; confining pressure applying means (not shown) for applying a preset confining pressure to the holding means where the porous medium is located, when the standard water in the porous medium is saturated; second injection means (not shown) for continuously injecting the standard water; a fourth measuring device (not shown) for measuring a fourth nuclear magnetic resonance image of the porous medium after a preset period of time; and fourth determining means (not shown) for determining the pore volume of the porous medium and the intensity of a nuclear magnetic resonance peak corresponding to a unit pore volume based on the fourth nuclear magnetic resonance map.
For specific details and advantages of the system for determining retention information of a polymer solution in a porous medium provided by the present invention, reference may be made to the above description of the method for determining retention information of a polymer solution in a porous medium, and further description thereof is omitted here.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. A method for determining retention information of a polymer solution in a porous medium, the method comprising:
displacing saturated standard water in the porous medium by using fluorine oil, and measuring the bound water pore volume of the porous medium under the condition that the oil content of first produced liquid obtained in the process of displacing the saturated standard water by using the fluorine oil is up to a preset percent oil content;
displacing the fluorine oil with the polymer solution until the retention of the polymer solution in the porous medium reaches a saturated state;
displacing the polymer solution retained in the porous medium with the fluorine oil, and measuring the sum of the bound water pore volume of the porous medium and the retention volume of the polymer solution in the porous medium in a state that the polymer-containing rate of a second produced fluid obtained in the process of displacing the polymer solution with the fluorine oil is as low as a preset percentage polymer-containing rate; and
determining the hold up of the polymer solution in the porous medium based on the bound water pore volume of the porous medium and the sum of the bound water pore volume and the hold up volume of the polymer solution in the porous medium,
wherein said measuring bound water pore volume of said porous medium comprises:
measuring a first nuclear magnetic resonance image of the porous medium in a state where the oil content of the first produced fluid is up to a preset percent oil content; and
determining a bound water pore volume of the porous media based on the first NMR chart and an intensity of NMR peaks corresponding to unit pore volume, an
Wherein said measuring the sum of said bound water pore volume of said porous medium and the hold-up volume of said polymer solution in said porous medium comprises:
measuring a second nmr plot of the porous medium at a polymer content of the second production fluid as low as a predetermined percentage polymer content; and
determining a sum of the bound water pore volume of the porous medium and a hold-up volume of the polymer solution in the porous medium based on the second NMR chart and an intensity of a NMR peak corresponding to a unit pore volume.
2. The method for determining retention information of a polymer solution in a porous medium according to claim 1, wherein before the saturated standard water in the porous medium is displaced with the fluorine oil, the method for determining further comprises:
injecting standard water into the porous medium, and determining the pore volume of the porous medium when the standard water in the porous medium is saturated;
measuring a third nuclear magnetic resonance image of the porous medium at saturation of the standard water in the porous medium; and
determining an intensity of the nuclear magnetic resonance peak corresponding to a unit pore volume based on the pore volume of the porous medium and the third nuclear magnetic resonance map.
3. The method for determining retention information of a polymer solution in a porous medium according to claim 2, wherein before displacing saturated standard water in the porous medium with a fluorine oil, the method further comprises:
injecting standard water into the porous medium;
applying preset confining pressure to a clamping device where the porous medium is located and continuously injecting the standard water when the standard water in the porous medium is saturated;
measuring a fourth NMR chart of the porous medium after a preset time period; and
determining the pore volume of the porous medium and the intensity of the nuclear magnetic resonance peak corresponding to the unit pore volume based on the fourth nuclear magnetic resonance map.
4. The method for determining retention information of a polymer solution in a porous medium according to claim 3, further comprising:
determining first distribution information of the standard water in the porous medium within different transverse relaxation times based on the third nuclear magnetic resonance image or the fourth nuclear magnetic resonance image;
determining second distribution information of the polymer solution in the porous medium within different transverse relaxation times based on the first nuclear magnetic resonance image and the second nuclear magnetic resonance image; and
and determining retention information of the polymer solution in the porous medium in different preset pore size intervals based on the first distribution information, the mercury intrusion curve of the porous medium and the second distribution information.
5. The method for determining retention information of a polymer solution in a porous medium according to claim 4, wherein the determining retention information of the polymer solution in different preset pore size intervals in the porous medium comprises:
determining first cumulative distribution information of the standard water within the porous medium over different transverse relaxation times based on the first distribution information;
determining second cumulative distribution information of mercury within the porous medium within different pore sizes based on the mercury intrusion curve;
determining a conversion coefficient from a transverse relaxation time to a pore size based on the first cumulative distribution information and the second cumulative distribution information; and
determining retention information of the polymer solution within different preset pore size intervals within the porous medium based on the determined conversion coefficient and the second distribution information.
6. A method for determining retention information of a polymer solution in a porous medium according to claim 5, wherein the determining a conversion coefficient for converting a transverse relaxation time into a pore size comprises:
matching a peak pattern of the first cumulative distribution information and a peak pattern of the second cumulative distribution information to determine a conversion coefficient from a transverse relaxation time to a pore size.
7. The method for determining retention information of a polymer solution in a porous medium according to claim 1, wherein before displacing the fluorine oil with the polymer solution, the method for determining further comprises:
and displacing the fluorine oil by using the standard water until the water content of a third produced liquid obtained in the process of displacing the fluorine oil by using the standard water reaches a state of preset percentage water content.
8. An assay system for retention information of a polymer solution in a porous medium, the assay system comprising:
the first measuring device is used for displacing saturated standard water in the porous medium by using fluorine oil, and measuring the bound water pore volume of the porous medium under the condition that the oil content of first produced liquid obtained in the process of displacing the saturated standard water by using the fluorine oil is up to a preset percent oil content;
a first displacement device for displacing the fluorine oil with the polymer solution until a retention amount of the polymer solution in the porous medium reaches a saturated state;
a second measuring device for displacing the polymer solution retained in the porous medium with the fluorine oil, and measuring a sum of the bound water pore volume of the porous medium and a retained volume of the polymer solution in the porous medium in a state where a polymer-containing rate of a second produced fluid obtained during the displacement of the polymer solution with the fluorine oil is as low as a preset percentage polymer-containing rate; and
first determining means for determining the hold up of the polymer solution in the porous medium based on the bound water pore volume of the porous medium and the sum thereof and the hold up volume of the polymer solution in the porous medium,
wherein the first measuring device comprises:
the first measurement module is used for measuring a first nuclear magnetic resonance image of the porous medium under the condition that the oil content of the first produced fluid is up to the preset percent oil content; and
a first determination module to determine a bound water pore volume of the porous media based on the first NMR map and an intensity of an NMR peak corresponding to a unit pore volume, an
Wherein the second measuring device comprises:
a second measurement module for measuring a second NMR of the porous medium at a polymer content of the second production fluid as low as a predetermined percentage polymer content; and
a second determination module to determine a sum of the bound water pore volume of the porous media and a hold-up volume of the polymer solution in the porous media based on the second nuclear magnetic resonance map and an intensity of a nuclear magnetic resonance peak corresponding to a unit pore volume.
9. A system for determining retention information of a polymer solution in a porous medium according to claim 8, further comprising:
second determining means for injecting standard water into the porous medium and determining a pore volume of the porous medium when the standard water in the porous medium reaches a saturated state;
a third measuring device for measuring a third nuclear magnetic resonance image of the porous medium at a state where the standard water in the porous medium is saturated; and
third determining means for determining the intensity of the nuclear magnetic resonance peak corresponding to a unit pore volume based on the pore volume of the porous medium and the third nuclear magnetic resonance map.
10. A system for determining retention information of a polymer solution in a porous medium according to claim 9, further comprising:
fourth determining means for determining first distribution information of the standard water in the porous medium within different transverse relaxation times based on the third nuclear magnetic resonance image or the fourth nuclear magnetic resonance image;
fifth determining means for determining second distribution information of the polymer solution within the porous medium within different transverse relaxation times based on the first nmr chart and the second nmr chart; and
a sixth determining device, configured to determine retention information of the polymer solution in different preset pore size intervals in the porous medium based on the first distribution information, the mercury intrusion curve of the porous medium, and the second distribution information,
the fourth nmr map is obtained by:
injecting standard water into the porous medium before displacing saturated standard water in the porous medium with fluoro-oil;
applying preset confining pressure to a clamping device where the porous medium is located and continuously injecting the standard water when the standard water in the porous medium is saturated; and
measuring the fourth NMR spectrum of the porous medium after a preset period of time.
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