CN110618071A - Gas phase critical filling pressure measuring device and method - Google Patents
Gas phase critical filling pressure measuring device and method Download PDFInfo
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- CN110618071A CN110618071A CN201910841444.0A CN201910841444A CN110618071A CN 110618071 A CN110618071 A CN 110618071A CN 201910841444 A CN201910841444 A CN 201910841444A CN 110618071 A CN110618071 A CN 110618071A
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000002347 injection Methods 0.000 claims abstract description 62
- 239000007924 injection Substances 0.000 claims abstract description 62
- 238000005481 NMR spectroscopy Methods 0.000 claims abstract description 55
- 239000011435 rock Substances 0.000 claims abstract description 35
- 238000012544 monitoring process Methods 0.000 claims abstract description 30
- 230000008859 change Effects 0.000 claims abstract description 10
- 239000012071 phase Substances 0.000 claims description 56
- 238000005259 measurement Methods 0.000 claims description 13
- 238000001228 spectrum Methods 0.000 claims description 13
- 239000012530 fluid Substances 0.000 claims description 9
- 239000011555 saturated liquid Substances 0.000 claims description 5
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 4
- 229910052731 fluorine Inorganic materials 0.000 claims description 4
- 239000011737 fluorine Substances 0.000 claims description 4
- 238000000691 measurement method Methods 0.000 claims 5
- 239000012808 vapor phase Substances 0.000 claims 1
- 239000007789 gas Substances 0.000 description 90
- 230000008569 process Effects 0.000 description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- 239000007788 liquid Substances 0.000 description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 230000035699 permeability Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000012153 distilled water Substances 0.000 description 3
- 239000008398 formation water Substances 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
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- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
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- 238000002592 echocardiography Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L7/00—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements
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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
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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Abstract
The invention provides a device and a method for measuring gas phase critical filling pressure, wherein the device comprises: the device comprises a gas injection device, an intermediate container, a pressure sensor, a monitoring module rock core holder and a nuclear magnetic resonance instrument; wherein: the nuclear magnetic resonance instrument is arranged close to the rock core holder and used for monitoring a nuclear magnetic resonance signal of the rock core to be detected; the gas injection device is connected with one end of the intermediate container through a first pipeline and is used for injecting gas into the intermediate container at a preset flow rate; the other end of the middle container is connected with the core holder through a second pipeline and used for injecting gas into a core to be detected of the core holder, and the pressure sensor is connected to the second pipeline; the monitoring module is electrically connected with the pressure sensor and is used for monitoring the change relation of the injection pressure of the core to be detected along with time in real time. The method and the device can effectively and accurately measure the gas-phase critical filling pressure and can solve the problem that the existing gas-phase critical filling pressure measuring method and means are lacked.
Description
Technical Field
The invention relates to the field of petroleum development, in particular to a core parameter measuring technology, and specifically relates to a device and a method for measuring gas phase critical filling pressure.
Background
The migration of natural gas into reservoirs in low-permeability rocks, gas-driven oil production, natural gas underground gas storage reservoirs and the like all involve the process of gas-driven liquid phase fluid flow, the process is influenced by rock medium capillary force and starting pressure, gas can drive liquid phase flow only when reaching a specific pressure value, and the specific pressure value is called as gas phase critical filling pressure. Accurate measurement of the critical filling pressure of the gas phase is crucial to the evaluation of the seepage potential of natural gas in a low-permeability medium and is also a necessary premise for making a reasonable oil gas development scheme. Liu Jie, etc. in the text of Experimental research on relationship between physical properties of extended low-porosity low-permeability sandstone groups in the region of Jing of the Baedos basin and the critical injection pressure of petroleum, a method for measuring the near-injection pressure by using an RLC (radio Link control) bridge is provided, but when oil gas begins to enter a rock core, resistance is insensitive to the change of saturation, so that the measurement error is large. A critical filling pressure measuring device and method (application No. 201910285310.5) determines the oil phase critical filling pressure by using a calibration idea, and the gas phase is compressible fluid unlike the oil phase, so the patent is not suitable for measuring the gas phase critical filling pressure. Therefore, no effective method or means is available for measuring the gas-phase critical filling pressure at present.
Disclosure of Invention
The embodiment of the invention provides a measuring device and a method for effectively and accurately measuring the gas-phase critical filling pressure, which can solve the problem that the existing gas-phase critical filling pressure measuring method and means are lacked and are used for measuring the critical filling pressure when gas displaces liquid. The invention can quickly and accurately measure the critical filling pressure of the gas phase, and the error of the measurement result is very small compared with the actual value.
In one aspect, an embodiment of the present invention provides a device for measuring a gas-phase critical filling pressure, including: the device comprises a gas injection device, an intermediate container, a pressure sensor, a monitoring module, a rock core holder and a nuclear magnetic resonance instrument; wherein:
the nuclear magnetic resonance instrument is arranged close to the rock core holder and used for monitoring a nuclear magnetic resonance signal of the rock core to be detected;
the gas injection device is connected with one end of the intermediate container through a first pipeline and is used for injecting gas into the intermediate container at a preset flow rate;
the other end of the middle container is connected with the core holder through a second pipeline and used for injecting gas into a core to be detected of the core holder, and the pressure sensor is connected to the second pipeline;
the monitoring module is electrically connected with the pressure sensor and is used for monitoring the change relation of the injection pressure of the core to be detected along with time in real time.
In one embodiment, the measuring device further comprises an annular pressure pump, and the annular pressure pump is connected with the core holder through a third pipeline.
In an embodiment, the measuring device further includes a pressure gauge disposed on the third pipe.
In one embodiment, a gas injection apparatus comprises: gas injection bottle and gas mass flow meter, wherein:
the gas injection bottle is connected with one end of the intermediate container through a first pipeline;
the gas mass flow meter is arranged on the first pipeline.
In another aspect, an embodiment of the present invention provides a method for measuring a critical filling pressure of a gas phase, where the method includes:
filling saturated liquid of a rock core to be detected into a rock core holder;
injecting gas into the core to be tested through the intermediate container at a preset flow rate by using a gas injection device;
measuring a nuclear magnetic resonance signal of the rock core to be measured by a nuclear magnetic resonance instrument;
the monitoring module records the pressure monitored by the pressure sensor in real time to obtain the injection pressure of the rock core to be detected;
and the monitoring module determines the gas-phase critical filling pressure of the rock core to be detected according to the nuclear magnetic resonance signal and the pressure monitored by the pressure sensor.
In one embodiment, the method for measuring the critical filling pressure of the gas phase further comprises: and increasing confining pressure of the core to be measured by using a ring pressure pump and ring pressure fluid.
In one embodiment, the annular pressure fluid is a fluorine oil.
In one embodiment, the nuclear magnetic resonance signals include: transverse relaxation spectrum T2.
In one embodiment, the monitoring module determines the gas-phase critical filling pressure of the core to be measured according to the nuclear magnetic resonance signal and the pressure monitored by the pressure sensor, and includes:
calculating an accumulated value of the transverse relaxation spectrum T2;
and determining the injection pressure of the corresponding core to be detected when the accumulated value is reduced, wherein the injection pressure of the corresponding core to be detected is the gas-phase critical filling pressure.
In one embodiment, the measuring of the nmr signal of the core to be measured by the nmr apparatus includes:
and measuring a nuclear magnetic resonance signal of the gas injection end of the rock core to be measured by the nuclear magnetic resonance instrument.
In one embodiment, the nuclear magnetic resonance apparatus measures a nuclear magnetic resonance signal of a core to be measured, and further includes: and measuring the nuclear magnetic resonance signal of the rock core to be measured at preset time intervals by using the nuclear magnetic resonance instrument.
From the above description, the present invention provides a device and a method for measuring a gas phase critical filling pressure, which can determine the critical filling pressure when gas phase displaces liquid in a low-permeability core by using the change of nuclear magnetic resonance signals of the core during the gas injection process. In conclusion, the gas-phase critical filling pressure can be measured quickly and accurately, and the error of the measurement result is small compared with the actual value.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a gas phase critical filling pressure measuring device according to an embodiment of the present invention;
FIG. 2 is another schematic diagram of a gas phase critical filling pressure measuring device according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating a method for measuring critical filling pressure of a gas phase according to an embodiment of the present invention;
FIG. 4 is a flow chart illustrating step 500 of a method for measuring critical filling pressure of a gas phase according to an embodiment of the present invention;
FIG. 5 is a graph of accumulated NMR signal and injection pressure over time for an example embodiment of the present invention;
fig. 6 is a schematic flow chart of an embodiment of the method for measuring the critical filling pressure of the gas phase according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a specific implementation manner of a gas-phase critical filling pressure measuring device, and referring to fig. 1, the device specifically comprises the following components: the gas injection device comprises a gas injection device 1, an intermediate container 2, a pressure sensor 3, a monitoring module 4, a rock core holder 5 and a nuclear magnetic resonance instrument.
In the absence of any external field, the nuclear magnetic moments in the core to be measured are randomly and freely aligned. Under the influence of a strong, uniform magnetic field, the spin system is polarized, and the nuclear magnetic moments are realigned and oriented along the magnetic field. At the same time, the nuclei also have orbital moments of momentum, surrounding like a gyroscope, and the direction of the magnetic field precesses with frequency and is proportional to the magnetic field strength. In the polarized magnetic field, if an alternating magnetic field is added in the direction perpendicular to the magnetic field, and the frequency of the alternating magnetic field is also the precession frequency of protons (hydrogen nuclei), a resonance absorption phenomenon occurs, that is, a nuclear magnetic moment in a low energy state transitions to a high energy state by absorbing energy provided by the alternating magnetic field, which is called nuclear magnetic resonance.
The nuclear magnetic resonance instrument 6 is arranged near the rock core holder 5 and used for monitoring nuclear magnetic resonance signals of the rock core to be detected.
In one embodiment, the distance may be set within a set distance range from the core holder, and the set distance range may be 1-20cm, but the invention is not limited thereto.
The gas injection apparatus 1 is connected to one end of the intermediate container 2 through a pipe 7 for injecting gas into the intermediate container 2 at a predetermined flow rate.
Preferably, the gas may be nitrogen; the capacity of the intermediate container may be 5000 ml; the magnetic field intensity of the nuclear magnetic resonance apparatus is 0.23T, and the corresponding hydrogen nuclear resonance frequency is 10.11 MHz; echo time 150 mus, number of scans 16, echo interval 1 mus, number of echoes 2048.
In an embodiment, see fig. 2, the gas injection device 1 can also be replaced by a micro-advection pump 1', it should be noted that in this embodiment, the intermediate container 2 needs to be vertically arranged and filled with a liquid which occupies a certain proportion of the internal volume of the intermediate container 2, and the rest of the intermediate container is filled with a gas, preferably, the liquid can be distilled water or other non-compressible liquid; the gas may be nitrogen. The preset flow rate may be 0.5 ml/min. The micro advection pump 1' injects distilled water into the middle part 2 at a preset flow rate, and the distilled water drives the gas above the middle container 2 to enter the core to be tested. Preferably, the micro-advection pump 1' adopts an ISCO pulseless high-pressure plunger pump.
The other end of the middle container 2 is connected with the core holder 5 through a pipeline 8 and used for injecting gas into a core to be measured of the core holder 5, and the pressure sensor 3 is connected to a second pipeline 8 and used for measuring the pressure of the core to be measured in the core holder 5 in real time.
In one embodiment, the gas injection apparatus 1 may be connected directly to the core holder 5 by piping, i.e., the intermediate container 2 is omitted.
In one embodiment, the measuring device further comprises an annular pressure pump 9, the annular pressure pump 9 is connected with the core holder 5 through a pipeline 10, and a pressure gauge 11 is further arranged on the pipeline 10 and used for simulating a formation pressure environment. Preferably, fluorine oil is used as confining pressure fluid to avoid nuclear magnetic resonance signal interference of confining pressure fluid.
In one embodiment, the gas injection apparatus 1 includes: gas injection bottle 12 and gas mass flow meter 13, wherein:
the gas injection bottle 12 is connected with one end of the intermediate container 2 through a pipeline 7; the gas mass flow meter 13 is provided on the pipe 7.
The gas mass flowmeter adopts the thermal sensing type measurement, the flow is measured according to the molecular mass taken away by the split molecules, and the measurement result cannot be influenced by the change of the gas temperature and the gas pressure.
From the above description, the present invention provides a gas phase critical filling pressure measuring device, which determines the critical filling pressure when gas phase replaces liquid in a low permeability core by using the change of nuclear magnetic resonance signals of the core during the gas injection process. In conclusion, the gas-phase critical filling pressure can be measured quickly and accurately, and the error of the measurement result is small compared with the actual value.
An embodiment of the present invention provides a specific implementation of a method for measuring a critical filling pressure of a gas phase, and referring to fig. 3, the method specifically includes the following steps:
step 100: and filling the core to be measured with saturated liquid into the core holder.
And (3) vacuumizing and pressurizing the core to be tested to obtain saturated liquid, and then loading the saturated liquid into the core holder, wherein the liquid can be formation water in the stratum where the core to be tested is located.
It will be appreciated that before the start of the operation of measuring the critical filling pressure of the gas phase, the tightness of the measuring device should be checked, in particular: opening a gas injection bottle, installing a stainless steel cylinder into the core holder, opening a monitoring module and a pressure sensor, pressurizing a measuring device to a preset value, closing the gas injection bottle, and checking whether the pressure is attenuated or not through the pressure sensor and the monitoring module; in a specific example, the preset value may be 10 MPa.
Step 200: and injecting gas into the rock core to be tested through the intermediate container at a preset flow rate by using a gas injection device.
And opening an air injection bottle in the air injection device, and injecting the gas into the rock core to be tested at a certain flow rate through a gas mass flowmeter. It will be appreciated that the smaller the injection flow, the more accurate the gas phase critical fill pressure is achieved.
Step 300: and measuring the nuclear magnetic resonance signal of the rock core to be measured by the nuclear magnetic resonance instrument.
The nmr measures nmr signals of the core to be measured at preset time intervals, and preferably, the nmr signals may be transverse relaxation spectra T2.
Step 400: and the monitoring module records the pressure monitored by the pressure sensor in real time to obtain the injection pressure of the core to be detected.
It is understood that the monitoring module records the pressure of the pressure sensor as a function of time at preset sampling time intervals, which may be 2s in one specific example, and the monitoring module may be a computer.
Step 500: and the monitoring module determines the gas-phase critical filling pressure of the rock core to be detected according to the nuclear magnetic resonance signal and the pressure monitored by the pressure sensor.
It can be understood that when gas is injected into the core to be measured, the nmr signal of the core to be measured by the nmr changes, and the pressure of the core to be measured monitored by the pressure sensor is the critical filling pressure of the gas phase.
From the above description, the present invention provides a method for measuring critical filling pressure of gas phase, which utilizes the change of nuclear magnetic resonance signal during the gas injection process of the core to determine the critical filling pressure when the gas phase replaces the liquid in the low permeability core. In conclusion, the gas-phase critical filling pressure can be measured quickly and accurately, and the error of the measurement result is small compared with the actual value.
In one embodiment, the method for measuring the critical filling pressure of the gas phase further comprises: and increasing confining pressure of the core to be measured by using a ring pressure pump.
In one embodiment, referring to fig. 4, step 500 includes:
step 501: and calculating an accumulated value of the transverse relaxation spectrum T2.
The transverse relaxation process is a process of exchanging energy with each other by the same kind of core, and due to the complexity of the pore structure of the core and the diversity of pore fluids and their occurrence states, the relaxation process will be a result of multiple component contributions with different relaxation times. Can be expressed by a multi-exponential function: when the formation is saturated with water and the echo spacing is relatively small, the T2 spectrum corresponds well to the distribution of rock pore sizes.
Step 502: and determining the injection pressure of the corresponding core to be detected when the accumulated value is reduced, wherein the injection pressure of the corresponding core to be detected is the gas-phase critical filling pressure.
And determining the moment when the accumulated transverse relaxation spectrum T2 begins to decrease, wherein the injection pressure corresponding to the moment is the critical filling pressure of the gas phase.
In one embodiment, the measuring of the nmr signal of the core to be measured by the nmr apparatus includes: and measuring a nuclear magnetic resonance signal of the gas injection end of the rock core to be measured by the nuclear magnetic resonance instrument.
It can be appreciated that to improve measurement accuracy, the nmr measurement machine only scans the gas injection end of the core in the core holder.
In one embodiment, the nuclear magnetic resonance apparatus measures a nuclear magnetic resonance signal of a core to be measured, and further includes: and measuring the nuclear magnetic resonance signal of the rock core to be measured at preset time intervals by using the nuclear magnetic resonance instrument. Preferably, the preset time interval may be 3 minutes.
From the above description, the present invention provides a method for measuring critical filling pressure of gas phase, which utilizes the change of nuclear magnetic resonance signal during the gas injection process of the core to determine the critical filling pressure when the gas phase replaces the liquid in the low permeability core. In conclusion, the gas-phase critical filling pressure can be measured quickly and accurately, and the error of the measurement result is small compared with the actual value.
To further illustrate the present solution, the present invention also provides a specific application example of the method for measuring the critical filling pressure of the gas phase, referring to fig. 1, fig. 5 and fig. 6. Specific application examples of the method for measuring the critical filling pressure specifically include the following:
it is understood that each measurement data in the gas phase critical filling pressure measurement method is a data point in fig. 5, but is specifically shown as a line in the figure because there are many data points in fig. 5.
S0: and measuring core parameters.
Measuring basic parameters of the rock core: length 2.52cm, diameter 2.519cm, gas permeability 0.5mD, porosity 12.6%.
S1: and detecting the tightness of the measuring device of the gas-phase critical filling pressure.
Opening the gas injection bottle 12, loading a stainless steel cylinder into the core holder 5, opening the monitoring module 4 and the pressure sensor 3, pressurizing the measuring device to 10MPa, stopping injecting the gas bottle 12, checking whether the pressure is attenuated or not through the pressure sensor 3 and the monitoring module 4, opening a valve after the checking is finished, and unloading the pressure of the measuring device.
S2: the core was saturated with formation water and placed in the core holder.
And vacuumizing the core, pressurizing and saturating formation water, and then loading the core into a core holder, wherein in specific implementation, after vacuumizing the core sample for 48 hours, the core sample is saturated for 12 hours under the pressure of 25 MPa.
S3: and simulating the formation pressure environment of the core.
And starting the annular pressure pump 9 and pressurizing the core to 8.5Mpa through the fluorine oil and the pressure gauge 11.
S4: nitrogen gas was injected into the core.
The gas injection bottle 12 was opened and nitrogen gas was injected into the core through the intermediate container 2 at a flow rate of 0.5ml/min through the gas mass flow meter 13.
S5: and measuring transverse relaxation spectrum T2 data of a nitrogen injection end of the core.
The nmr was turned on and transverse relaxation spectrum T2 data from the nitrogen injection end of the core (to one-fourth of the core) was measured at 3 minute intervals.
S6: the injection pressure of the core was measured.
And starting the monitoring module 4 and the pressure sensor 3, and monitoring and recording the injection pressure value of the core at a time interval of 30 seconds.
S7: and calculating an accumulated value of the transverse relaxation spectrum T2.
S8: the gas phase critical filling pressure of the core is determined.
And determining the injection pressure of the corresponding core when the accumulated value of the transverse relaxation spectrum T2 is reduced, wherein the injection pressure of the corresponding core is the gas-phase critical filling pressure, and referring to FIG. 5, when the accumulated value of the transverse relaxation spectrum T2 starts to be reduced (180min), the nitrogen injection pressure corresponding to the core at the time is 0.442Mpa (point A in the graph), and then the gas-phase critical filling pressure of the core is 0.422 Mpa.
From the above description, the present invention provides a method for measuring critical filling pressure of gas phase, which utilizes the change of nuclear magnetic resonance signal during the gas injection process of the core to determine the critical filling pressure when the gas phase replaces the liquid in the low permeability core. In conclusion, the gas-phase critical filling pressure can be measured quickly and accurately, and the error of the measurement result is small compared with the actual value.
The foregoing description has been directed to specific embodiments of this disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results.
Although embodiments of the present description provide method steps as described in embodiments or flowcharts, more or fewer steps may be included based on conventional or non-inventive means. The order of steps recited in the embodiments is merely one manner of performing the steps in a multitude of orders and does not represent the only order of execution. When an actual apparatus or end product executes, it may execute sequentially or in parallel (e.g., parallel processors or multi-threaded environments, or even distributed data processing environments) according to the method shown in the embodiment or the figures. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the presence of additional identical or equivalent elements in a process, method, article, or apparatus that comprises the recited elements is not excluded.
The above description is only an example of the embodiments of the present disclosure, and is not intended to limit the embodiments of the present disclosure. Various modifications and variations to the embodiments described herein will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present specification should be included in the scope of the claims of the embodiments of the present specification.
Claims (11)
1. A device for measuring a critical vapor phase fill pressure, comprising: the device comprises a gas injection device (1), an intermediate container (2), a pressure sensor (3), a monitoring module (4), a rock core holder (5) and a nuclear magnetic resonance instrument (6); wherein:
the nuclear magnetic resonance instrument (6) is arranged close to the rock core holder (5) and is used for monitoring a nuclear magnetic resonance signal of the rock core to be detected;
the gas injection device (1) is connected with one end of the intermediate container (2) through a first pipeline (7) and is used for injecting gas into the intermediate container (2) at a preset flow rate;
the other end of the middle container (2) is connected with the core holder (5) through a second pipeline (8) and is used for injecting the gas into a core to be detected of the core holder (5), and the pressure sensor (3) is connected to the second pipeline (8);
the monitoring module (4) is electrically connected with the pressure sensor (3) and is used for monitoring the change relation of the injection pressure of the core to be detected along with time in real time.
2. Measuring device according to claim 1, characterized in that the measuring device further comprises an annular pressure pump (9), which annular pressure pump (9) is connected to the core holder (5) via a third conduit (10).
3. The measuring device according to claim 1, characterized in that it further comprises a pressure gauge (11), said pressure gauge (11) being arranged on the third conduit (10).
4. The measuring device according to claim 1, characterized in that the gas injection device (1) comprises: gas injection bottle (12) and gas mass flow meter (13), wherein:
the gas injection bottle (12) is connected with one end of the intermediate container (2) through the first pipeline (7);
the gas mass flow meter (13) is arranged on the first pipeline (7).
5. A method of measuring a critical vapor filling pressure applied to the apparatus for measuring a critical vapor filling pressure according to claim 1, comprising:
filling the core to be detected with saturated liquid into the core holder (5);
injecting the gas into the core to be tested through the intermediate container (2) at a preset flow rate by using the gas injection device (1);
the nuclear magnetic resonance instrument (6) measures a nuclear magnetic resonance signal of the rock core to be measured;
the monitoring module (4) records the pressure monitored by the pressure sensor in real time to obtain the injection pressure of the core to be detected;
and the monitoring module (4) determines the gas-phase critical filling pressure of the core to be detected according to the nuclear magnetic resonance signal and the pressure monitored by the pressure sensor (3).
6. The measurement method according to claim 5, further comprising: and increasing the confining pressure of the core to be measured by utilizing a ring pressure pump (9) and ring pressure fluid.
7. The method of measurement according to claim 6, wherein the annular pressure fluid is a fluorine oil.
8. The measurement method according to claim 5, wherein the nuclear magnetic resonance signal includes: transverse relaxation spectrum T2.
9. The measurement method according to claim 8, wherein the determining, by the monitoring module (4), the gas-phase critical filling pressure of the core to be measured according to the nuclear magnetic resonance signal and the pressure monitored by the pressure sensor (3) comprises:
calculating an accumulated value of the transverse relaxation spectrum T2;
and determining the injection pressure of the corresponding to-be-detected rock core when the accumulated value is reduced, wherein the injection pressure of the corresponding to-be-detected rock core is the gas-phase critical filling pressure.
10. The measurement method according to claim 5, wherein the NMR instrument (6) measures NMR signals of the core under test, comprising:
and the nuclear magnetic resonance instrument (6) measures a nuclear magnetic resonance signal of the gas injection end of the rock core to be detected.
11. The measurement method according to claim 5, wherein the nuclear magnetic resonance instrument (6) measures the nuclear magnetic resonance signal of the core under test, further comprising: and the nuclear magnetic resonance instrument (6) measures nuclear magnetic resonance signals of the rock core to be measured at preset time intervals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910841444.0A CN110618071A (en) | 2019-09-06 | 2019-09-06 | Gas phase critical filling pressure measuring device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910841444.0A CN110618071A (en) | 2019-09-06 | 2019-09-06 | Gas phase critical filling pressure measuring device and method |
Publications (1)
| Publication Number | Publication Date |
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| CN110618071A true CN110618071A (en) | 2019-12-27 |
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| CN113607622A (en) * | 2021-08-04 | 2021-11-05 | 西南石油大学 | Experimental device and method for testing turbulence influence in water flooding process through double pipes |
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| CN113607622A (en) * | 2021-08-04 | 2021-11-05 | 西南石油大学 | Experimental device and method for testing turbulence influence in water flooding process through double pipes |
| CN113607622B (en) * | 2021-08-04 | 2023-09-05 | 西南石油大学 | Experimental device and method for testing turbulence influence in water flooding process through double pipes |
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Application publication date: 20191227 |