CN215179511U - Simulation experiment system for flow field and temperature field of underground fluid - Google Patents

Abstract

The utility model discloses a fluid flow field and temperature field simulation experiment system underground, including artificial rock core, be provided with a plurality of first wells and a plurality of second wells on the artificial rock core, the entry end of first well is connected to first jar through valve and first filter, the exit end of second well is connected to the second jar through valve and second filter, artificial rock core is arranged in the temperature-controlled box, and artificial rock core is latticed on the surface and has arranged a plurality of electromagnetic probe and temperature probe. The utility model discloses flow field and temperature field in can real-time three-dimensional dynamic monitoring stratum are mainly applicable to the geothermal field and adopt the simulation of the development condition to the notes, the law that flows of fracturing fluid in the stratum when also being applicable to the displacement experiment simulation in oil gas field or simulation oil gas development.

Description

Simulation experiment system for flow field and temperature field of underground fluid

Technical Field

The utility model relates to a field such as geothermal energy development, oil gas field development, concretely relates to underground fluid flow field and temperature field simulation experiment system.

Background

The geothermal energy is a green, low-carbon and recyclable renewable resource and has the characteristics of large reserves, wide distribution, cleanness, environmental protection, good stability, high utilization coefficient and the like. The energy-saving and emission-reducing device has great potential for future energy supply and energy conservation and emission reduction, and is highly accepted and valued by various countries in the world. In the development and utilization of geothermal energy, the injection and production well group is generally utilized to develop and produce geothermal energy, and the principles of 'recharging raw water on the same layer' and 'fixed-production by a tank' are strictly followed. The distribution and change rule of the flow field between formation fluids and the distribution and change rule of the temperature field are important for researching the natural exploitation. At present, the research of a flow field and a temperature field for geothermal exploitation is mainly carried out by a numerical simulation or software simulation method, a small amount of experimental devices generally cannot realize visual observation, and the influence rule of factors such as injection and production well pattern types, inclined stratums and the like on the exploitation effect is not considered.

At present, most oil fields enter secondary oil recovery or even tertiary oil recovery, and along with the oil field recovery, the energy of an oil layer is continuously consumed, so that the pressure of the oil layer is continuously reduced, underground crude oil is greatly degassed, the viscosity is increased, the yield of the oil well is greatly reduced, even the production can be stopped, and a large amount of residual oil remained underground cannot be recovered. In order to improve the oil recovery efficiency, water flooding development is generally carried out, and in order to improve the water flooding development effect, a water flooding simulation research experiment is often required to be developed. In consideration of safety and cost factors, the existing water flooding experiment is generally carried out in a sand filling model, so that the change rules of a formation temperature field and a flow field in the water flooding development process are inconvenient to research and visually observe, therefore, the research and development of the model capable of accurately simulating the real formation have great significance for researching the water flooding effect and the change rules of the formation temperature field and the flow field in the water flooding development process, and further improving the oil recovery rate.

In the process of reservoir fracturing, the flowing direction of fracturing fluid, migration in stratum, flow field distribution and change rule are important for researching and representing the form of reservoir fractures and the reservoir fracturing transformation effect. At present, the commonly used method for tracing the fracturing fluid mainly comprises a method for tracing by using a tracer or by using trace elements or a method for detecting microseism, and the method has poor monitoring effect on some special formations. For example, coal rock reservoirs are soft, acoustic emission events are few when the reservoirs are broken, and micro-seismic detection effects are poor.

At present, the stratum structure is simulated by glass beads commonly used in the industry, the experimental error of the method is large, important parameters such as porosity, permeability and the like of a real stratum cannot be simulated, and therefore the generated flow field distribution and change rule research result error is large. The current simulation experiment system for the flow field and the temperature field of the underground fluid cannot monitor the dynamic change conditions of the flow field and the temperature field in the three-dimensional stratum in real time generally, cannot observe the change rule of the flow field and the temperature field visually, is low in experiment precision and brings inconvenience to experimental research.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an underground fluid flow field and temperature field simulation experiment system to overcome the problem that exists among the prior art, the utility model discloses flow field and the temperature field dynamic change condition in can the real-time supervision three-dimensional stratum is applicable to the simulation geothermal field and annotates and adopts the development process, is applicable to the flow field situation of change of fracturing fluid in the stratum in the displacement process of simulation oil gas field, the development of simulation oil gas.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides an underground fluid flow field and temperature field simulation experiment system, includes artificial rock core, be provided with a plurality of first wells and a plurality of second well on the artificial rock core, the entry end of first well is connected to the first jar that is equipped with salt solution or clear water through valve, first pump and first filter, the exit end of second well is connected to the second jar through valve, second pump and second filter, the artificial rock core is arranged in the accuse temperature case, and artificial rock core is latticed on the surface and has arranged a plurality of electromagnetic probe and temperature probe.

Further, an outlet of the first tank is connected to an inlet of a first filter, and an outlet of the first filter is connected to an inlet of the first well through a second valve, a first pump, a first flow meter, a first temperature meter, a first pressure meter, and a third valve in this order.

Further, a fourth valve, a second thermometer and a second pressure gauge are sequentially arranged between the outlet of the second well and the inlet of the second filter; and a second flowmeter, a second pump and a fifth valve are sequentially connected between the outlet of the second filter and the inlet of the second tank.

Further, the second pump and the fifth valve are connected to the inlet of the first tank through a pipeline, and a seventh valve is arranged on the pipeline.

Further, the bottom of the first tank and the bottom of the second tank are provided with a first valve and a sixth valve, respectively.

Further, the artificial core is supported by a support and can rotate to different inclination angles through the support.

Further, the artificial rock core is in a cuboid shape.

Further, when one first well is adopted, one, two, three or four second wells are adopted; when the first well is two, the second well is two or three.

Further, when one first well is adopted, and one second well is adopted, the wellbore bottom parts of the first well and the second well are respectively positioned in the center of the left half part and the center of the right half part of the cuboid artificial core; when the first well adopts one, the second well adopts two, three or four, the bottom of the shaft of the first well is positioned at the central position of the cuboid artificial rock core, and the second wells are uniformly distributed around the first well.

Compared with the prior art, the utility model discloses following profitable technological effect has:

the utility model discloses utilize conductivity method, temperature monitoring mode, the seepage flow field and the temperature field change law of fluid in the stratum in the real stratum of monitoring. Use artificial rock core to simulate the condition in real stratum, through the quantity of particle diameter, cement and the water of adjustment sand, come the approximate reservoir important parameter such as porosity and permeability that simulates in the real stratum for the flow field that produces, temperature field distribution and the relevant research result of change law can be the same with real stratum or similar, the utility model discloses can be in real time three-dimensional dynamic monitoring stratum flow field and temperature field, mainly be applicable to the simulation of geothermal field to the injection and production condition, be applicable to the displacement in simulation oil gas field, simulate the seepage flow condition of fracturing fluid in the stratum in unconventional oil gas development.

Further, the utility model discloses a thermometer, manometer, flowmeter control the solution temperature, pressure, the flow of pouring into, the seepage flow condition in the true simulation stratum.

Furthermore, the artificial core is supported by the support, and can rotate through the support, so that the inclination angle is adjusted, and the formation inclination angle is simulated.

Further, through changing the cloth hole mode, the utility model discloses can simulate "one notes one and adopt", also can simulate "one notes two adopt", "one notes three adopt", "one notes four adopt", also can adopt "two notes two adopt", "two notes three adopt", "many notes are adopted more" notes annotate the mode of adopting such as adopt.

Drawings

FIG. 1 is a schematic diagram of the system of the present invention;

FIG. 2 is a distribution diagram of an electromagnetic probe on an artificial core;

FIG. 3 is a distribution diagram of a temperature probe on an artificial core;

FIG. 4 is a top view of an artificial core during one-injection and two-extraction;

FIG. 5 is a top view of an artificial core during one-injection and three-mining;

fig. 6 is a top view of the artificial core during one-injection-four-mining.

The system comprises a first valve 1, a first tank 2, a first filter 3, a second valve 4, a first pump 5, a first flowmeter 6, a first thermometer 7, a first pressure gauge 8, a third valve 9, a first well 10, a second well 11, a fourth valve 12, a second thermometer 13, a second pressure gauge 14, a second filter 15, a second flowmeter 16, a second pump 17, a fifth valve 18, a second tank 19, a sixth valve 20, a seventh valve 21, an artificial core 22, a bracket 23, an electromagnetic probe 24 and a temperature probe 25.

Detailed Description

In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Referring to fig. 1, an experimental system for simulating a flow field and a temperature field of a subsurface fluid comprises: the system comprises a first valve 1, a first tank 2, a first filter 3, a second valve 4, a first pump 5, a first flowmeter 6, a first thermometer 7, a first pressure gauge 8, a third valve 9, a first well 10, a second well 11, a fourth valve 12, a second thermometer 13, a second pressure gauge 14, a second filter 15, a second flowmeter 16, a second pump 17, a fifth valve 18, a second tank 19, a sixth valve 20, a seventh valve 21, an artificial core 22, a bracket 23, an electromagnetic probe 24 and a temperature probe 25.

In the experimental system, a first valve 1, a first tank 2, a first filter 3, a second valve 4, a first pump 5, a first flowmeter 6, a first thermometer 7, a first pressure gauge 8, a third valve 9, and a first well 10 are connected in sequence by a pipeline.

In the test system, a second well 11, a fourth valve 12, a second thermometer 13, a second pressure gauge 14, a second filter 15, a second flowmeter 16, a second pump 17, a fifth valve 18, a second tank 19, and a sixth valve 20 are connected in sequence by pipelines.

In the test system, the first valve 1 is a sampling valve, and the sixth valve 20 is a sampling valve.

The artificial rock core 22 is designed into a cuboid shape, the side length proportion of each artificial rock core is set according to the experimental scale, and the wells of the first well 10 and the second well 11 are recommended to be respectively designed to be positioned at the centers of the left semi-cuboid and the right semi-cuboid. In addition, during the experiment, the artificial core 22 was placed in a temperature controlled box to simulate the true formation temperature.

In the experimental system, the first tank 2 is connected between the second pump 17 and the fifth valve 18 through a line via a seventh valve 21.

In the experimental system, the artificial rock core 22 is supported by the support 23, and the artificial rock core 22 can rotate by the support 23, so that the inclination angle is adjusted and the formation inclination angle is simulated.

In the experimental system, a plurality of grid-shaped electromagnetic probes 24 are arranged on the top surface (other 5 surfaces can also be arranged) of the artificial rock core 22, and the density can be flexibly and practically according to experimental requirements. The fluid field monitored by the electromagnetic probe 24 is three-dimensional, and the electromagnetic probe 24 is made of copper or silver.

In the experimental system, a plurality of temperature probes 25 are arranged on the surface of the artificial rock core 22 in a grid-like manner; the temperature probe 25 has a plurality of temperature sensors so that the temperature field monitored is three-dimensional.

The following introduces the functions of the key parts of the present invention as follows:

(1) the first valve 1 is a sampling valve and is used for extracting or emptying and cleaning a sample in the first tank 2; the sixth valve 20 is a sampling valve to extract or purge the sample in the second tank 19.

(2) The first tank 2 is filled with a salt solution (such as a NaCl solution) or clear water for simulating formation water.

(3) Two layers of screens with different sizes are arranged inside the first filter 3 and the second filter 15, the first layer of screen has larger pores to isolate large granular impurities, and the second layer of screen has smaller pores to isolate small granular impurities.

(4) The first flow meter 6 and the second flow meter 16 select appropriate ranges according to the experiment.

(5) The first thermometer 7 is used to monitor the temperature entering the artificial core 22. A first pressure gauge 8 monitors the pressure of the injected artificial core 22.

(6) The artificial core 22 is supported by a bracket 23, and the artificial core 22 can rotate through the bracket 23 to adjust the inclination angle and simulate the formation inclination angle.

(7) A second thermometer 13 monitors the second well 11 outlet temperature and a second pressure gauge 14 monitors the second well 11 outlet pressure.

(8) After passing through the second well 11 and the second pump 17, the salt solution or the clean water is returned to the first tank 2 through the seventh valve 21, so that the salt solution or the clean water is circulated in the experimental system.

(9) The electromagnetic probes 24 and the temperature probes 25 are arranged in a grid shape on the surface of the cuboid, as shown in fig. 2 and 3.

(10) The experimental system can simulate 'one injection and one extraction', also can simulate 'one injection and two extractions', 'one injection and three extractions', 'one injection and four extractions', and has the well arrangement mode shown in figures 4, 5 and 6. Injection-production modes such as 'two-injection two-production' and 'two-injection three-production' can also be adopted, and the injection-production modes are all one mode of a multi-injection multi-production mode.

(11) In the experimental system, the influencing factors mainly include the discharge capacity and temperature of the salt solution or clear water injection or discharge, the porosity and permeability of the artificial rock core 22 and the temperature of the temperature control box. The change of the porosity and permeability of the artificial core 22 functions to change the porosity and permeability of the artificial core 22 by changing the particle size of sand and the mixing ratio of sand, cement and water. When the above-mentioned influence factors are changed, the subsequent comparison experiment is carried out in the same way.

The following is presented in conjunction with the embodiments of the present invention:

the following cases are divided into 3 types and are introduced respectively: geothermal development, fracturing fluid monitoring and water flooding experiment simulation.

1. When simulating geothermal development, the experimental procedure was as follows:

(1) preparation before experiment:

preparing a rock sample: designing an artificial rock core, selecting sand and cement with proper particle size and material according to experimental requirements, adjusting the proportion of the sand, the cement and water, and simulating main parameters such as target stratum permeability, porosity and the like;

a connecting device: as shown in fig. 1, connecting all the components, designing two wells for the artificial core 22, arranging an electromagnetic probe 24 and a temperature probe 25, adding a salt solution or clear water into the first tank 2, placing the artificial core 22 in a temperature control box, and heating the artificial core 22 to an experimental target temperature;

(2) pumping salt solution or clear water: opening a second valve 4 and a third valve 9, pumping the salt solution or the clean water in the first tank 2 into the artificial rock core 22 through a first pump 5, removing internal impurities from the salt solution or the clean water through a first filter 3, metering the flow through a first flow meter 6, and recording the temperature and the pressure of the pumped salt solution or the clean water through a first thermometer 7 and a first pressure gauge 8;

extracting salt solution or clear water: when pumping the salt solution or the clear water, opening the fourth valve 12 and the fifth valve 18, pumping the salt solution or the clear water injected into the artificial rock core 22 into a second tank 19 through a second pump 17, and monitoring the temperature and the pressure of the salt solution or the clear water through a second thermometer 13 and a second pressure gauge 14; the second filter 15 filters the extracted particulate matters in the salt solution or clear water, and the second flowmeter 16 records the extraction flow;

(3) a circulating system: the fifth valve 18 is closed, the seventh valve 21 is opened, and the salt solution or the clean water is reinjected into the first tank 2 through the seventh valve 21;

(4) data monitoring: the experimental data monitored by the electromagnetic probe 24 and the temperature probe 25 are processed by a computer, and the change rule of the simulated flow field and the temperature field is monitored;

(5) and (4) finishing the test: after the experiment is finished, discharging the salt solution or the clean water through the first valve 1 and the sixth valve 20;

(6) the experimental system can simulate 'one injection and one extraction', also can simulate 'one injection and two extractions', 'one injection and three extractions', 'one injection and four extractions', and has the well arrangement mode shown in figures 4, 5 and 6. Injection-production modes such as 'two-injection two-production' and 'two-injection three-production' can also be adopted, and the injection-production modes are all one mode of a multi-injection multi-production mode;

2. when simulating the water flooding experiment, the experimental steps are as follows

Firstly, manufacturing an artificial core 22 according to the requirements of permeability, porosity and the like of a stratum required by an experiment, arranging an electromagnetic probe 24 and a temperature probe 25 according to a net structure, adjusting the number of the probes according to the requirement of the experiment, placing the probes in a temperature control box, and heating the artificial core 22 to an experiment target temperature; secondly, filling the first tank 2 with oil, and injecting the oil into the pores of the artificial rock core through a first pump 5 until the oil is saturated; thirdly, filling the first tank 2 with water, opening the first valve 4 and the first pump 5 to inject the water into the artificial core 22, simultaneously opening the second pump 17 to pump out oil or water in the artificial core 22, and monitoring a temperature field and a flow field formed in the artificial core through the arranged temperature probe 25 and the electromagnetic probe 24;

the oil used in the water flooding experiment of the utility model can be replaced by kerosene or crude oil.

In the experimental system, the influencing factors are mainly the discharge capacity and temperature of water injection or extraction, the porosity and permeability of the artificial core 22 and the temperature of the temperature control box. The change of the porosity and permeability of the artificial core 22 functions to change the porosity and permeability of the artificial core 22 by changing the particle size of sand and the mixing ratio of sand, cement and water. When the above-mentioned influence factors are changed, the subsequent comparison experiment is carried out in the same way.

3. When simulating fracturing fluid monitoring, the experimental procedures were as follows:

firstly, manufacturing an artificial core 22 according to the requirements of permeability, porosity and the like of a stratum required by an experiment, arranging an electromagnetic probe 24 and a temperature probe 25 according to a net structure, adjusting the number of the probes according to the requirement of the experiment, placing the probes in a temperature control box, and heating the artificial core 22 to an experiment target temperature; next, the first tank 2 is filled with fracturing fluid, the second valve 4 and the first pump 5 are opened to inject the fracturing fluid into the artificial core 22, and a temperature field and a flow field formed in the artificial core are monitored by the deployed temperature probe 25 and the deployed electromagnetic probe 24.

In the experimental system, the influencing factors are mainly the type of fracturing fluid, the injection or discharge displacement and the temperature, the porosity and the permeability of the artificial rock core 22 and the temperature of the temperature control box. The change of the porosity and permeability of the artificial core 22 functions to change the porosity and permeability of the artificial core 22 by changing the particle size of sand and the mixing ratio of sand, cement and water. When the above-mentioned influence factors are changed, the subsequent comparison experiment is carried out in the same way.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be considered as the protection scope of the present invention.

Claims (9)

1. The utility model provides an underground fluid flow field and temperature field simulation experiment system, its characterized in that, includes artificial rock core (22), be provided with a plurality of first wells (10) and a plurality of second well (11) on artificial rock core (22), the entry end of first well (10) is connected to first jar (2) that are equipped with salt solution or clear water through valve, first pump (5) and first filter (3), the exit end of second well (11) is connected to second jar (19) through valve, second pump (17) and second filter (15), artificial rock core (22) are arranged in the temperature-controlled box, and artificial rock core (22) are latticed on the surface and have been arranged a plurality of electromagnetic probe (24) and temperature probe (25).

2. A subsurface fluid flow and temperature field simulation experiment system according to claim 1, characterized in that the outlet of the first tank (2) is connected to the inlet of a first filter (3), and the outlet of the first filter (3) is connected to the inlet of a first well (10) sequentially through a second valve (4), a first pump (5), a first flow meter (6), a first temperature meter (7), a first pressure gauge (8) and a third valve (9).

3. A simulation experiment system for a subsurface fluid flow field and a temperature field according to claim 1, wherein a fourth valve (12), a second thermometer (13) and a second pressure gauge (14) are sequentially arranged between the outlet of the second well (11) and the inlet of the second filter (15); and a second flowmeter (16), a second pump (17) and a fifth valve (18) are sequentially connected between the outlet of the second filter (15) and the inlet of the second tank (19).

4. A subsurface fluid flow and temperature field simulation experiment system according to claim 3, characterized in that the second pump (17) and the fifth valve (18) are connected to the inlet of the first tank (2) by a pipeline, and a seventh valve (21) is arranged on the pipeline.

5. A subsurface fluid flow and temperature field simulation experiment system according to claim 1, characterized in that the bottom of the first tank (2) and the bottom of the second tank (19) are provided with a first valve (1) and a sixth valve (20), respectively.

6. A subsurface fluid flow and temperature field simulation experiment system according to claim 1, characterized in that the artificial core (22) is supported by a bracket (23), and the artificial core (22) can be rotated to different inclination angles by the bracket (23).

7. The subsurface fluid flow field and temperature field simulation experiment system according to claim 1, wherein the artificial core (22) is cuboid in shape.

8. A subsurface fluid flow and temperature field simulation experiment system according to claim 7, characterized in that when one is used for the first well (10), one, two, three or four are used for the second well (11); when two first wells (10) are used, two or three second wells (11) are used.

9. A subsurface fluid flow and temperature field simulation experiment system according to claim 8, characterized in that when one first well (10) and one second well (11) are used, the borehole bottom of the first well (10) and the second well (11) are respectively located at the center of the left half and the center of the right half of the cuboid artificial core (22); when one first well (10) is adopted, and two, three or four second wells (11) are adopted, the bottom of the well bore of the first well (10) is positioned at the central position of the cuboid artificial rock core (22), and the second wells are uniformly distributed around the first well (10).

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