CN209821099U - Multifunctional compact gas reservoir dynamic parameter joint measurement device based on nuclear magnetic resonance - Google Patents
Multifunctional compact gas reservoir dynamic parameter joint measurement device based on nuclear magnetic resonance Download PDFInfo
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- CN209821099U CN209821099U CN201920324812.XU CN201920324812U CN209821099U CN 209821099 U CN209821099 U CN 209821099U CN 201920324812 U CN201920324812 U CN 201920324812U CN 209821099 U CN209821099 U CN 209821099U
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Abstract
The utility model discloses a multi-functional compact gas reservoir dynamic parameter allies oneself with surveys device based on nuclear magnetic resonance, including capillary pressure electrical property allies oneself with the survey appearance, nuclear magnetic resonance appearance 10, electrode 22, LCR digital bridge 21, pressure collection station 20, temperature sensor 24 and data acquisition control cabinet 6, capillary pressure electrical property allies oneself with the survey appearance and includes high-pressure nitrogen gas storage tank 7, confined pressure pump 13 and the rock core holder 11 that is used for centre gripping rock specimen, high-pressure nitrogen gas storage tank 7 and confined pressure pump 13 are connected to rock core holder 11's one end, the tee bend is connected to the other end, soap film flowmeter 25 is connected to tee bend's one end, the other end extends to in the measuring flask 18 to connect liquid metering tank 16, gas flowmeter 14 through metering tube 17; the core holder is arranged in a measuring cavity of the nuclear magnetic resonance instrument 10; the two ends of the core holder are respectively connected with an LCR digital bridge 21 through electrodes 22, and are also connected with a pressure collector 20 and a temperature sensor 24. The utility model discloses the principle is reliable, and is easy and simple to handle, can obtain a plurality of rock core dynamic parameters in dense gas reservoir.
Description
Technical Field
The utility model relates to an oil gas field exploration and development field, concretely relates to multi-functional compact gas reservoir layer dynamic parameter allies oneself with surveys device based on nuclear magnetic resonance.
Background
In order to meet the increasing energy demand of world economy, the field of oil and gas exploration and development gradually enters the army of unconventional oil and gas resources, and great breakthrough is made. Compared with the conventional reservoir, the reservoir characteristics and the reservoir parameters of the dense gas are greatly different, the pore structure and the rock composition are more complex, the reservoir space is more diverse, and the heterogeneity is stronger. Therefore, the method can accurately test dynamic parameters such as the rock-electricity parameters, capillary pressure, irreducible water saturation, starting pressure gradient and the like of the compact gas reservoir in a laboratory, and has important significance for evaluating and developing the compact gas reservoir.
The common reservoir pore throat structure characterization technical means mainly comprise a casting body slice, a scanning electron microscope, a capillary pressure curve method (mercury intrusion technique), a nuclear magnetic resonance and micro-nano-CT scanning technique and the like. The casting body slice and the scanning electron microscope can only observe a certain two-dimensional section, and limited two-dimensional pore throat structure information is extracted through subsequent image processing. The capillary pressure curve method is most commonly used in mercury intrusion technique, and the conventional mercury intrusion technique can only give out different throat radiuses and volume distribution controlled by corresponding throats. The constant rate mercury intrusion technique is limited by mercury intrusion pressure, does not identify pores and throats with radii less than 0.119 μm, and also involves the use of toxic substances. The micro-nano-CT scanning method has the advantages of high scanning speed, large scanning coverage range and capability of providing quantitative parameters of the pore-throat structure, but the measurement method is complex and the cost is high.
The irreducible water saturation is one of important parameters for representing the physical properties of the reservoir, and as the porosity and the permeability of the compact gas reservoir become smaller, the complexity of a pore structure is enhanced, and the effect of the irreducible water saturation on evaluating the physical properties of the reservoir is more obvious. The laboratory typically uses unsteady gas flooding to obtain core irreducible water saturation. During the experiment, gas is injected into the rock sample saturated with water at a constant pressure, and the gas displaces water in the pores of the rock sample. Due to the heterogeneity of the micro-pore structure of the rock, part of water exists in the form of water film or liquid drops in the displacement process, and the water is still difficult to displace when the displacement pressure is increased. Thus, it is theorized that the water saturation in the rock sample at this time is the irreducible water saturation. According to the method, the gas saturation and the water saturation of the rock core can be calculated by recording the water yield, the gas yield and the pressure difference between two ends of the rock core along with the change of time, but the water saturation of the rock core cannot be accurately obtained in real time.
In a low-permeability compact gas reservoir, gas seepage easily generates unique seepage characteristics different from those of a medium-high permeability gas detection reservoir, deviates from Darcy's law, shows low-speed non-Darcy seepage characteristics, and has a starting pressure gradient, so that the method has an important guiding effect on exploitation of the low-permeability compact gas reservoir. The low-speed non-Darcy seepage experiment is generally used for researching the low-speed flow behavior of the core and the existence of starting pressure by obtaining a relation curve of flow and pressure gradient. The test requires lower displacement pressures and fine and precise pressure regulation. When the low-speed Darcy seepage behavior of the core under the irreducible water saturation is solved, the saturated core needs to be displaced to the irreducible water saturation, and then the low-speed Darcy experiment is carried out, so that the process consumes time.
The traditional test equipment for testing a capillary pressure curve, a gas-water relative permeability curve and a low-speed non-Darcy seepage curve in a laboratory is single, and each dynamic parameter needs to be measured separately, so that the core needs to be loaded and unloaded by confining pressure for multiple times, the operations can influence the structure of the core, the pore structure of the core is changed, the closure of micro cracks or the fracture of the core can be more likely to be caused, and the aims of accurately knowing the stratum and guiding the development of an oil reservoir can not be fulfilled; meanwhile, the reservoir parameters need to be tested by a plurality of instruments individually, which is time-consuming.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a multi-functional compact gas reservoir dynamic parameter allies oneself with surveys device based on nuclear magnetic resonance, the device principle is reliable, and is easy and simple to handle, can obtain a plurality of rock core dynamic parameters in compact gas reservoir through the device: the method comprises the steps of simultaneously measuring the resistivity of a rock core, capillary pressure, pore throat distribution and a gas-water relative permeability curve by adopting a semi-permeable partition plate method and an unsteady gas-water phase permeability test method, then testing the low permeability characteristic and starting pressure gradient of the rock core through a conventional low-speed non-Darcy permeability test, and measuring the water saturation and pore throat distribution of a rock sample in real time by combining nuclear magnetic resonance technical equipment in the test, thereby obtaining a plurality of rock core dynamic parameters of a compact gas reservoir.
In order to achieve the above technical objects, the present invention provides the following technical solutions.
A multifunctional compact gas reservoir dynamic parameter joint measurement device based on nuclear magnetic resonance comprises a capillary pressure electric joint measurement instrument, a nuclear magnetic resonance instrument and a data acquisition console. Capillary pressure electric connection tester includes high-pressure nitrogen gas storage tank, confined pressure pump and is used for adorning the rock core holder of rock specimen, high-pressure nitrogen gas storage tank and confined pressure pump all are connected with rock core holder one end through the pipeline, the pipeline that the other end of rock core holder is connected extends to the measuring flask of placing on weighing device in through tee bend one end, and measuring flask outlet end pipeline is connected with metering tube and flowmeter.
The core holder is placed in a measuring cavity of the nuclear magnetic resonance apparatus, a first valve and a first pressure controller are arranged on a pipeline between the high-pressure nitrogen storage tank and the pressure regulating system, a second valve and a second pressure controller are arranged on a pipeline between the confining pressure pump and the core holder, a third valve and a pressure collecting system are arranged on a pipeline between the core holder and the measuring bottle, a fourth valve is arranged on a pipeline between the measuring bottle and the metering pipe, and a fifth valve is arranged between the fourth valve and the soap film flowmeter; and a sixth valve is arranged on a pipeline between the liquid metering tank and the gas flowmeter.
The two ends of the rock core holder are respectively connected with an LCR digital bridge used for measuring the resistance of the rock sample through an electrode, and the first pressure controller, the second pressure controller, the pressure acquisition system, the LCR digital bridge and the nuclear magnetic resonance instrument are all connected with a data acquisition console.
Compared with the prior art, the utility model discloses following beneficial effect has:
(1) the device can reduce the damage to the rock core by experiment, only carries out loading and unloading of confining pressure once on the rock core, and avoids the influence of multiple times of confining pressure loading and unloading on the structure of the rock core;
(2) the device can test multiple dynamic parameters, adopts the combination of a semi-permeable partition plate method, a gas flowmeter, a soap film flowmeter and a nuclear magnetic resonance instrument, applies certain confining pressure and displacement pressure to a saturated rock sample through a high-pressure nitrogen cylinder and a confining pressure pump, and can measure the rock core resistance and the T resistance under different water saturation degrees in the displacement process through an LCR digital electric bridge and the nuclear magnetic resonance instrument2Spectrum and capillary pressure; the gas flow meter can measure the gas production rate in the displacement process in real time, and when no water flows out, the soap film flow meter can measure the relation between the gas flow rate and the pressure gradient in the displacement process;
(3) the data acquisition console passes through the core resistance and T2The spectrum and capillary pressure can monitor the whole measuring device, and the resistivity, capillary pressure and pore radius of the rock sample under different water saturation degrees are measured in real time, so that the pore throat distribution and the oil-gas saturation degree of the rock sample are effectively evaluated and analyzed.
Drawings
FIG. 1 is a schematic diagram of a multifunctional compact gas reservoir dynamic parameter joint measurement device based on nuclear magnetic resonance.
In the figure, 1, a first valve; 2. a second valve; 3. a third valve; 4. a fourth valve; 5. a fifth valve; 6. A data acquisition console; 7. a high pressure nitrogen storage tank; 8. a first pressure controller; 9. a second pressure controller; 10 nuclear magnetic resonance apparatus; 11. a core holder; 12. a hydrophilic separator; 13. a confining pressure pump; 14. a gas flow meter; 15. a sixth valve; 16. a liquid metering tank; 17. a metering tube; 18. measuring the bottle; 19. an electronic balance; 20. a pressure collector; 21. An LCR digital bridge; 22. an electrode; 23. a time controller; 24. a temperature sensor; 25. soap film flow meter.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and the present invention is not limited to the embodiments as long as various changes are defined in the appended claims and the spirit and content of the technical solution of the present invention.
See fig. 1.
The multifunctional compact gas reservoir dynamic parameter joint measurement device based on nuclear magnetic resonance comprises a capillary pressure electric joint measurement instrument, a nuclear magnetic resonance instrument 10, an electrode 22, an LCR digital bridge 21, a pressure collector 20, a temperature sensor 24 and a data acquisition control console 6, wherein the capillary pressure electric joint measurement instrument comprises a high-pressure nitrogen storage tank 7, a confining pressure pump 13 and a rock core holder 11 for holding a rock sample, one end of the rock core holder 11 is connected with the high-pressure nitrogen storage tank 7 and the confining pressure pump 13, the other end of the rock core holder 11 is connected with a tee joint, one end of the tee joint is connected with a soap film flowmeter 25, and the other end of the tee joint extends into a measurement bottle 18 placed on an electronic balance 19 and is connected with a liquid metering tank 16 and a gas flowmeter 14 through a metering pipe 17.
The core holder 11 is placed in a measuring cavity of the nuclear magnetic resonance instrument 10, a rock sample is filled in the core holder 11, and a first valve 1 and a first pressure controller 8 are arranged on a pipeline between the high-pressure nitrogen storage tank 7 and the core holder 11; a second valve 2 and a second pressure controller 9 are arranged on a pipeline between the confining pressure pump 13 and the core holder 11; a third valve 3 is arranged on a pipeline between the core holder 11 and the measuring bottle 18; a fourth valve 4 is arranged on a pipeline between the measuring bottle 18 and the measuring pipe 17; a fifth valve 5 is arranged on a pipeline between the third valve 3 and the soap film flowmeter 25; a sixth valve 15 is provided in the conduit between the liquid metering tank 16 and the gas flow meter 14.
The two ends of the core holder 11 are respectively connected with an LCR digital bridge 21 for measuring the resistance of the rock sample through electrodes 22, and the core holder 11 is also connected with a pressure collector 20 and a temperature sensor 24.
The first pressure controller 8, the second pressure controller 9, the LCR digital bridge 21, the nuclear magnetic resonance instrument 10, the electronic balance 19, the pressure collector 20 and the temperature sensor 24 are all connected with the data acquisition console 6.
The electronic balance 19 can obtain the water drained from the rock sample according to the weight difference value measured when the rock sample is in the adjacent saturated water state, and the water saturation of the rock sample can be rapidly calculated according to the mass of the drained water.
The metering tube 17, liquid metering tank 16, gas flow meter 14 can obtain the gas displacement water yield by discharging the volume of water.
The soap film flow meter 25 obtains the flow rate of gas through the core by measuring the time it takes for a volume.
The first pressure controller 8 and the second pressure controller 9 can be pressure sensors with model numbers PT124G-128, the data acquisition console 6 can be a computer, and can also be a control chip with model number TMS320DSC 2X.
The high-pressure nitrogen storage tank 7 is matched with the first valve 1 and used for providing displacement pressure for the core holder 11, the first pressure controller 8 is used for collecting pressure on a corresponding pipeline, and the data collection control console 6 judges whether the displacement pressure provided for the core holder 11 reaches a set value or not according to collected pressure data.
The confining pressure pump 13 is matched with the second valve 2 to provide confining pressure for the core holder 11, the second pressure control is used for collecting pressure on corresponding pipelines, and the data collection control console 6 judges whether the confining pressure provided for the core holder 11 reaches a set value or not through collected pressure data.
When the pipeline connected with the measuring bottle 18 has no water flowing out, the rock sample is in a saturated water state, the pressure acquired by the first pressure controller 1 is capillary pressure, the LCR digital bridge 21 and the nuclear magnetic resonance instrument 10 can upload the acquired data to the data acquisition console 6 at any time, the data acquisition console 6 can record the capillary pressure, the resistance acquired by the LCR digital bridge 21 and the T of the nuclear magnetic resonance instrument 10 at the moment once at each set time, and when the rock sample is in the saturated water state, the data acquisition console 6 needs to record the capillary pressure, the resistance acquired by the LCR digital bridge 21 and the T of the nuclear magnetic resonance instrument 10 at the moment2Spectrum and temperature of the rock sample.
During the implementation, the hydrophilic baffle 12 with the contact of rock specimen both ends has been placed at the both ends of the sealed chamber of the inside rock specimen of placing of this scheme preferred rock core holder 11, can avoid gaseous entering rock specimen after setting up hydrophilic baffle 12 before the capillary pressure of breaching certain throat to guarantee the accuracy of each measured data in the testing process.
During implementation, the pressure collector 20 connected with the data acquisition control console 6 is arranged between the measuring bottle 18 and the third valve 3, and whether water flows out of a rock sample can be judged through pressure signals collected by the pressure collector, so that the calculation inaccuracy of subsequent rock electrical parameters caused by errors in manual observation is avoided.
In implementation, when the rock sample is not in a saturated water state, the fourth valve 4 connected with the metering pipe 17 is opened, and the liquid metering pipe and the gas flowmeter meter the gas production in the testing process; when the rock sample is in a saturated water state, the soap film flowmeter connected with the valve five 5 can measure the flow speed of the gas.
In implementation, the multifunctional compact gas reservoir dynamic parameter joint measurement device preferably based on nuclear magnetic resonance in the scheme further comprises a time controller 23 which is respectively connected with the nuclear magnetic resonance instrument 10, the LCR digital bridge 21 and the data acquisition console 6; after the time controller 23 is set, the nuclear magnetic resonance apparatus 10 and the LCR digital bridge 21 can be controlled by the time controller 23 to upload the acquired data at set intervals.
The measuring device provided by the scheme adopts a semi-permeable partition plate method, an unsteady gas-water phase permeability test method, a conventional low-speed non-Darcy seepage test method and nuclear magnetic resonance technical equipment to measure the resistivity, capillary pressure and pore throat distribution of the rock sample under different water saturation degrees in real time, and can measure the saturation degree of bound water and the starting pressure gradient at the same time.
The resistivity of the rock sample is measured by a semi-permeable partition method, formation water is firstly prepared to saturate the rock sample, certain confining pressure and displacement pressure are applied to the rock sample through a high-pressure nitrogen cylinder 7 and a confining pressure pump 13, and the core resistance and the T resistance under 100 percent saturation condition before displacement and different water saturation degrees in the displacement process are recorded through an LCR digital electric bridge 21 and a nuclear magnetic resonance instrument 102And (4) spectrum and capillary pressure to obtain the pore radius and the resistivity under different water saturation degrees and the relative permeability of gas and water under different water saturation degrees. Then, under the water saturation, the starting pressure and the starting pressure gradient are obtained, and a certain time (half an hour) is set by the time controller 23 in the processReal-time monitoring is carried out, and the whole experimental device is monitored through a data acquisition device, so that the pore throat distribution, the oil-gas saturation and the productivity of the rock sample are effectively evaluated and analyzed.
Claims (3)
1. The multifunctional compact gas reservoir dynamic parameter joint measurement device based on nuclear magnetic resonance comprises a capillary pressure electric joint measurement instrument, a nuclear magnetic resonance instrument (10), an electrode (22), an LCR digital bridge (21), a pressure collector (20), a temperature sensor (24) and a data acquisition console (6), wherein the capillary pressure electric joint measurement instrument comprises a high-pressure nitrogen storage tank (7), a confining pressure pump (13) and a rock core holder (11), and is characterized in that one end of the rock core holder (11) is connected with the high-pressure nitrogen storage tank (7) and the confining pressure pump (13), the other end of the rock core holder (11) is connected with a tee joint, one end of the tee joint is connected with a soap film flowmeter (25), and the other end of the tee joint extends into a measurement bottle (18) placed on an electronic balance (19), and is connected with a liquid metering tank (16) and a gas flowmeter (14) through a metering pipe (17); the rock core holder (11) filled with the rock sample is placed in a measuring cavity of a nuclear magnetic resonance instrument (10), and a first pressure controller (8) is arranged on a pipeline between the high-pressure nitrogen storage tank (7) and the rock core holder (11); a second pressure controller (9) is arranged on a pipeline between the confining pressure pump (13) and the core holder (11); two ends of the core holder (11) are respectively connected with an LCR digital bridge (21) through electrodes (22), and the core holder is also connected with a pressure collector (20) and a temperature sensor (24); the first pressure controller (8), the second pressure controller (9), the LCR digital bridge (21), the nuclear magnetic resonance instrument (10), the electronic balance (19), the pressure collector (20) and the temperature sensor (24) are all connected with the data acquisition console (6).
2. The multifunctional compact gas reservoir dynamic parameter simultaneous measurement device based on nuclear magnetic resonance as claimed in claim 1, characterized in that hydrophilic baffles (12) are arranged at two ends of a sealed cavity for placing rock samples in the core holder (11).
3. The nuclear magnetic resonance-based multifunctional compact gas reservoir dynamic parameter simultaneous measurement device is characterized by further comprising a time controller (23) which is respectively connected with the nuclear magnetic resonance instrument (10), the LCR digital bridge (21) and the data acquisition console (6).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108827853A (en) * | 2018-05-22 | 2018-11-16 | 西南石油大学 | Compact reservoir rock electrical measurement and measurement method based on nuclear magnetic resonance |
| CN112881472A (en) * | 2021-01-18 | 2021-06-01 | 克拉玛依市昂科能源科技有限公司 | Method and device for rock sample resistivity and nuclear magnetic resonance joint measurement in fluid displacement process |
| CN113970508A (en) * | 2020-08-18 | 2022-01-25 | 中国石油天然气股份有限公司 | Multifunctional core flow test platform |
-
2019
- 2019-03-14 CN CN201920324812.XU patent/CN209821099U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108827853A (en) * | 2018-05-22 | 2018-11-16 | 西南石油大学 | Compact reservoir rock electrical measurement and measurement method based on nuclear magnetic resonance |
| CN108827853B (en) * | 2018-05-22 | 2024-02-06 | 西南石油大学 | Nuclear magnetic resonance-based tight reservoir rock electric measurement device and measurement method |
| CN113970508A (en) * | 2020-08-18 | 2022-01-25 | 中国石油天然气股份有限公司 | Multifunctional core flow test platform |
| CN113970508B (en) * | 2020-08-18 | 2024-05-28 | 中国石油天然气股份有限公司 | Multifunctional rock core flow test platform |
| CN112881472A (en) * | 2021-01-18 | 2021-06-01 | 克拉玛依市昂科能源科技有限公司 | Method and device for rock sample resistivity and nuclear magnetic resonance joint measurement in fluid displacement process |
| CN112881472B (en) * | 2021-01-18 | 2021-12-14 | 克拉玛依市昂科能源科技有限公司 | Method and device for rock sample resistivity and nuclear magnetic resonance joint measurement in fluid displacement process |
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