CN105092790A - Coal reservoir fracturing physical simulation device and simulation method based on solvent extraction - Google Patents
Coal reservoir fracturing physical simulation device and simulation method based on solvent extraction Download PDFInfo
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- CN105092790A CN105092790A CN201510488825.7A CN201510488825A CN105092790A CN 105092790 A CN105092790 A CN 105092790A CN 201510488825 A CN201510488825 A CN 201510488825A CN 105092790 A CN105092790 A CN 105092790A
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Abstract
The invention discloses a coal reservoir fracturing physical simulation device and simulation method based on solvent extraction. The device comprises a vacuum sample tank provided with an end cap. A heater is arranged on the outer surface of the vacuum sample tank. An input port of the vacuum sample tank is connected with the output end of an injection system through a pipeline. The pipeline between the injection system and the vacuum sample tank is sequentially provided with a pressure pump and an injection valve. The injection system comprises a gas tank, a solvent tank and a mineral water tank. The input port of the vacuum sample tank is connected with a recycling system through a pipeline provided with a recycling valve and a gas-liquid separator. The recycling system comprises a recycling gas tank and a recycling liquid tank. The vacuum sample tank is further connected with a vacuum pump. By means of the physical simulation device and simulation method, action of organic and/or inorganic solvents on coal and expanding situations of pores and fractures can be simulated after the organic and/or inorganic solvents serve as fracturing liquid to be pressed into the coal under the real reservoir conditions, and bases are provided for subsequent research of coal samples and extraction liquid. Meanwhile, a new thought is provided for the fracturing development technology of coal reservoirs.
Description
Technical field
The present invention relates to coal seam reservoirs physical property and improve field, particularly relate to a kind of physical simulating device based on solvent-extracted coal seam reservoirs pressure break and analogy method.
Background technology
Solvent extraction is also one of current of paramount importance texture of coal research method the earliest, and the much main understanding about texture of coal and concept are obtained by solvent extraction.It is generally acknowledged, the solvent extraction of coal is permeated by sovent diffusion, and---process that crosslink bond fracture---coal network structure is opened---organic matter dissolves is carried out.At present, still paid attention to widely by the research method of solvent extraction acquisition texture of coal information and applied.In coal chemistry research, by solvent extraction, what utilize solvent to have awards-is discharged mutually by coal small molecular by electronic capability, and the subject and object reaching texture of coal is separated, with supposition and checking coal texture model and the impact of the character on coal thereof.By extracting step by step, small molecular phase is progressively separated from macromolecular network structure, to the analysis of solvend in different solvents and insolubles, the foundation and the checking that can be texture of coal model on the one hand provide a large amount of foundation, and extract small molecular quantity also represent the stability of coal physicochemical property to a certain extent on the other hand.
Gas in coal seam mainly exists with ADSORPTION STATE, due to the complicacy of coal seam reservoirs porous dehiscence gap and the hypo-osmoticity of reservoir, in current coal-seam gas Ground Developing practice, often adopts the reservoir such as waterfrac treatment, acid fracturing enhancements, to increase the perviousness of reservoir.Although a large amount of experiments and research have been done in the solvent extraction of researchist to coal both at home and abroad, be mainly used in the research of coal chemistry and texture of coal, even but of the fracturing fluid for organic solvent extraction proportioning method is not directly used in the analogue experiment installation and research method that improve reservoir conditions.In view of in current cbm development process, the simple method relying on conventional hydraulic pressure break and gas drive, the effect obtained is not remarkable, needs badly and seeks new reservoir reinforcement process measure, to improve reservoir properties, thus increases coal bed gas well production capacity.
Summary of the invention
The object of this invention is to provide a kind of physical simulating device based on solvent-extracted coal seam reservoirs pressure break and analogy method, can Reality simulation reservoir conditions be organic injects coal seam reservoirs with inorganic solvent as fracturing liquid, by utilizing the small molecular phase in organic solvent stripping coal reservoir, or utilize inorganic solvent to dissolve mineral matter in coal, also organic mixed solvent of different ratio or inorganic mixed solvent can be injected coal body, or organic and inorganic solvent are combined, as inorganic acid solution is pressed into coal body as spearhead, again organic solvent is pressed into as sand-carrying agent, hole fissurity and the gas penetration potential of coal body is fully changed with this, the spread scenarios in recycling utility appliance Real-Time Monitoring coal mesopore crack, and the gas penetration potential of coal is detected by gas injection, to simulate the anti-reflection process of reservoir strengthening, for the fracturing developing technology of coal-seam gas provides new thinking.
The present invention adopts following technical proposals:
Based on the physical simulating device of solvent-extracted coal seam reservoirs pressure break, comprise the vacuum sample tank being provided with end cap, vacuum sample tank outside surface is provided with well heater, the input port of vacuum sample tank connects the output terminal of injected system by pipeline, the pipeline between injected system and vacuum sample tank is disposed with forcing pump and fillup valve; Described injected system comprises gas pot, solvent tank and mineralising water pot, and the delivery outlet of vacuum sample tank is connected recovery system by being provided with recovery valve with the pipeline of gas-liquid separator, and described recovery system comprises gas recovery tank and withdrawal liquid tank; Vacuum sample tank is also connected with vacuum pump.
Described vacuum sample tank two ends are provided with acoustic emission inductor, and vacuum sample tank is externally connected to Acoustic radiating instrument.
Pipeline between described forcing pump and fillup valve is also provided with over-pressure safety device.
Pipeline between described fillup valve and vacuum sample tank is also provided with tensimeter.
Described forcing pump adopts pressure flow adjustable pressure pump.
Described forcing pump has constant voltage pressurization and constant current pressurization function, and the rated pressure of forcing pump is greater than 20MPa.
Described well heater adopts annular infrared heater, and annular infrared heater is around being arranged on vacuum sample tank outside surface.
Described end cap is threaded with vacuum sample tank, is provided with packoff between end cap and vacuum sample tank, and packoff adopts rubber seal; Described pipeline adopts high-strength press solenoid.
Utilize the analogy method of carrying out based on the physical simulating device of solvent-extracted coal seam reservoirs pressure break in claim 1 to 8 described in any one, comprise the following steps:
A: contrived experiment scheme, obtains the temperature of true coal seam reservoirs, pressure and property of water-bearing data, and according to the experiment effect intending obtaining, pressure needed for slective extraction liquid kind, concentration and pressure break;
B: the end cap opening vacuum sample tank, puts into vacuum sample tank by the column in simulation area or granular coal sample, then closes the end cap of vacuum sample tank;
C: start vacuum pump by inner for vacuum sample tank extracting vacuum;
D: start acoustic emission inductor and Acoustic radiating instrument, monitors the hole change caused because of the effect of pressure break extract real-time dynamicly;
E: open fillup valve and starting pressure pump, injects gas and mineralized water according to the pressure of the true coal seam reservoirs recorded and the property of water-bearing, the pressure of coal seam reservoirs and the property of water-bearing under Reality simulation state;
F: start annular infrared heater, carries out homogeneous heating to vacuum sample tank;
G: when the temperature and pressure in vacuum sample pot reaches after design temperature and pressure, starting pressure pump also injects the extract configured according to experimental program again, when reaching experimental program set pressure, closing presure pump and fillup valve;
H: close acoustic emission inductor and Acoustic radiating instrument, extracts acoustic emission data;
I: require to leave standstill according to experimental program until arrive setting-up time;
J: open recovery valve, and the gas and the liquid that start that gas-liquid separator reclaims generation in vacuum sample tank, the gas of recovery and liquid are stored in gas recovery tank and withdrawal liquid tank respectively; K: open the end cap of vacuum sample tank and take out coal sample, then opens gas recovery tank and withdrawal liquid tank takes out the gas and liquid that store.
In described steps A, extract adopts organic solvent and/or inorganic solvent; During use, select the one in following several scheme:
(1) adopt organic solvent separately, utilize organic solvent to be pressed into coal sample as fracturing liquid, weaken the intermolecular association bonding force in texture of coal cross-linked network, by small molecular phase stripping;
(2) adopt inorganic solvent separately, utilize the acidization of the mineral acid in inorganic solvent to be dissolved by the mineral matter in coal;
(3) organic mixed solvent of different ratio or inorganic mixed solvent is selected, to strengthen mixed solvent to the expansion in coal mesopore crack and anti-reflection action effect in press-in coal sample;
(4), after first utilizing the mineral acid in inorganic solvent to carry out acidification, recycling organic solvent carries out organic extraction; Or first organic solvent is pressed into, and then utilizes the mineral acid in inorganic solvent to carry out acidification, coal mesopore crack is expanded and anti-reflection effect thoroughly.
The present invention is based on solvent-extracted principle, by the process of solvent good for proportioning simulation reservoir hydrfracturing, inject coal columnar samples.Adopt infrared heating device simulation reservoir temperature, utilize the moisture situation that gas pot carrys out the gaseous tension of Reality simulation reservoir, mineralising water pot carrys out Reality simulation reservoir by the mineralized water that proportioning is good, realize the simulation of reservoir fracturing, and the expansion of porous dehiscence slot sytem by means of acoustic emission device Real-Time Monitoring reservoir, thus realize the application of solvent extraction method in reservoir strengthening.The present invention more effectively can change hole, the fissure system of reservoir, and reduces surface energy, reaches the adsorptive power improved reservoir properties and reduce coal, thus greatly improves the ability of coal-seam gas desorb, diffusion, seepage flow.Solvent extraction is strengthened with reservoir and is effectively combined by the present invention, can to realize under true reservoir conditions behind extract press-in coal seam with the mass exchange of coal body, and effective improvement of reservoir properties, for the physical simulation of follow-up reservoir fracturing technology provides technical support, anti-reflection this scientific research theory of coal body is realized to solution extraction and moves towards this revolutionary character of engineer applied from laboratory and play a pivotal role.The present invention also has that structure is simple, cost is low and easy to operate advantage.
Accompanying drawing explanation
Fig. 1 is the structural representation of the physical simulating device based on solvent-extracted coal seam reservoirs pressure break of the present invention;
Fig. 2 is the process flow diagram of the analogy method of the physical simulating device based on solvent-extracted coal seam reservoirs pressure break of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is done with detailed description:
As shown in Figure 1, physical simulating device based on solvent-extracted coal seam reservoirs pressure break of the present invention, comprise the vacuum sample tank 1 being provided with end cap, end cap is threaded with vacuum sample tank 1, and be provided with packoff between end cap and vacuum sample tank 1, packoff can adopt rubber seal, for ensureing the impermeability that vacuum sample tank 1 is good.Vacuum sample tank 1 outside surface is provided with well heater, and well heater can adopt annular infrared heater 2, and annular infrared heater 2, around being arranged on vacuum sample tank 1 outside surface, can ensure the homogeneous heating to vacuum sample tank 1.Vacuum sample tank 1 two ends are provided with acoustic emission inductor, and vacuum sample tank 1 is externally connected to Acoustic radiating instrument, and Acoustic radiating instrument is for monitoring the dynamic change of the porous dehiscence slot sytem in coal seam.
The input port of vacuum sample tank 1 connects the output terminal of injected system by pipeline, the pipeline between injected system and vacuum sample tank 1 is disposed with forcing pump 3, over-pressure safety device 4, fillup valve 5 and tensimeter 6.Gas in injected system and liquid inject in vacuum sample tank 1 for generation of pressure by forcing pump 3, forcing pump 3 can adopt pressure flow adjustable pressure pump 3, there is constant voltage pressurization and constant current pressurization function, the rated pressure of forcing pump 3 is greater than 20Mpa, with satisfied simulation deep layer, ultra-deep layer reservoir pressure experiment demand.Over-pressure safety device 4 can promote security performance of the present invention, avoids causing potential safety hazard because pressure is excessive, and fillup valve 5 is for controlling the break-make of pipeline, and tensimeter 6 is convenient to experimenter and is observed pressure in pipeline at any time.
Described injected system comprises gas pot 7, solvent tank 8 and mineralising water pot 9, and the delivery outlet of vacuum sample tank 1 is connected recovery system by being provided with recovery valve 10 with the pipeline of gas-liquid separator 11, and recovery system comprises gas recovery tank 12 and withdrawal liquid tank 13.Recovery valve 10 is for controlling the break-make of pipeline, and the gas produced in vacuum sample tank 1 can be separated with liquid by gas-liquid separator 11, and is delivered to respectively in gas recovery tank 12 and withdrawal liquid tank 13.The middle part of vacuum sample tank 1 is also connected with vacuum pump 14, for realizing the vacuum state in vacuum sample tank 1, avoids composition of air to the interference of experiment.
In the present invention, the pipeline of use is high-strength press solenoid, is stressed and is greater than 20Mpa, with satisfied simulation deep layer, ultra-deep layer reservoir pressure experiment demand.Vacuum sample tank 1 is cylindrical, and the diameter of vacuum sample tank 1 is 150mm, long 300mm.
As shown in Figure 2, analogy method of carrying out based on solvent-extracted coal seam reservoirs pressure break physical simulating device of the present invention, comprises the following steps:
A: contrived experiment scheme, obtains the temperature of true coal seam reservoirs, pressure and property of water-bearing data, and according to the experiment effect intending obtaining, pressure needed for slective extraction liquid kind, concentration and pressure break;
B: the end cap opening vacuum sample tank 1, puts into vacuum sample tank 1 by the column in simulation area or granular coal sample, then closes the end cap of vacuum sample tank 1, to ensure the impermeability that vacuum sample tank 1 is good;
C: start vacuum pump 14 by inner for vacuum sample tank 1 extracting vacuum, avoids composition of air to the interference of experiment;
D: start acoustic emission inductor and Acoustic radiating instrument, monitors the hole change caused because of the effect of pressure break extract real-time dynamicly;
E: open fillup valve 5 starting pressure pump 3, injects gas and mineralized water, for pressure and the property of water-bearing of coal seam reservoirs under Reality simulation state according to the pressure of the true coal seam reservoirs recorded and moisture gas-bearing property;
F: start annular infrared heater, carries out homogeneous heating, to simulate reservoir temperature to vacuum sample tank 1;
G: when the temperature and pressure in vacuum sample pot 1 reaches after design temperature and pressure, starting pressure pump 3 also injects the extract configured according to experimental program again, extract can select inorganic or organic solvent, when reaching experimental program set pressure, and closing presure pump 3 and fillup valve 5;
H: close acoustic emission inductor and Acoustic radiating instrument, extracts acoustic emission data, so that later stage research;
I: require to leave standstill according to experimental program until arrive setting-up time;
J: open recovery valve 10, and the gas and the liquid that start that gas-liquid separator 11 reclaims generation in vacuum sample tank 1, the gas of recovery and liquid are stored in gas recovery tank 12 and withdrawal liquid tank 13 respectively; K: open the end cap of vacuum sample tank 1 and take out coal sample, then opens gas recovery tank 12 and withdrawal liquid tank 13 takes out the gas and liquid that store, provides basis to the research of follow-up coal sample and extract.
After completing above-mentioned steps, next step experimental test and analysis can be carried out according to coal sample method of testing and gas composition analysis method and extract relevant test method.
In described steps A, extract can adopt organic solvent and/or inorganic solvent;
When using extract in step G, the one in following several scheme can be selected:
(1) adopt organic solvent separately, utilize organic solvent to be pressed into coal sample as fracturing liquid, weaken the intermolecular association bonding force in texture of coal cross-linked network, by small molecular phase stripping;
(2) adopt inorganic solvent separately, utilize the acidization of the mineral acid in inorganic solvent to be dissolved by the mineral matter in coal;
(3) organic mixed solvent of different ratio or inorganic mixed solvent is selected, to strengthen mixed solvent to the expansion in coal mesopore crack and anti-reflection action effect in press-in coal sample;
(4), after first utilizing the mineral acid in inorganic solvent to carry out acidification, recycling organic solvent carries out organic extraction; Or first organic solvent is pressed into, and then utilizes the mineral acid in inorganic solvent to carry out acidification, coal mesopore crack is expanded and anti-reflection effect thoroughly.
It should be noted that; above-mentioned specific embodiment is only exemplary; under above-mentioned instruction of the present invention, those skilled in the art can carry out various improvement and distortion on the basis of above-described embodiment, and these improve or distortion all drops in protection scope of the present invention.It will be understood by those skilled in the art that specific descriptions are above to explain object of the present invention, not for limiting the present invention.Protection scope of the present invention is by claim and equivalents thereof.
Claims (10)
1. based on the physical simulating device of solvent-extracted coal seam reservoirs pressure break, it is characterized in that: comprise the vacuum sample tank being provided with end cap, vacuum sample tank outside surface is provided with well heater, the input port of vacuum sample tank connects the output terminal of injected system by pipeline, the pipeline between injected system and vacuum sample tank is disposed with forcing pump and fillup valve; Described injected system comprises gas pot, solvent tank and mineralising water pot, and the delivery outlet of vacuum sample tank is connected recovery system by being provided with recovery valve with the pipeline of gas-liquid separator, and described recovery system comprises gas recovery tank and withdrawal liquid tank; Vacuum sample tank is also connected with vacuum pump.
2. the physical simulating device based on solvent-extracted coal seam reservoirs pressure break according to claim 1, is characterized in that: described vacuum sample tank two ends are provided with acoustic emission inductor, and vacuum sample tank is externally connected to Acoustic radiating instrument.
3. the physical simulating device based on solvent-extracted coal seam reservoirs pressure break according to claim 1, is characterized in that: the pipeline between described forcing pump and fillup valve is also provided with over-pressure safety device.
4. the physical simulating device based on solvent-extracted coal seam reservoirs pressure break according to claim 1, is characterized in that: the pipeline between described fillup valve and vacuum sample tank is also provided with tensimeter.
5. the physical simulating device based on solvent-extracted coal seam reservoirs pressure break according to claim 1, is characterized in that: described forcing pump adopts pressure flow adjustable pressure pump.
6. the physical simulating device based on solvent-extracted coal seam reservoirs pressure break according to claim 1, is characterized in that: described forcing pump has constant voltage pressurization and constant current pressurization function, and the rated pressure of forcing pump is greater than 20MPa.
7. the physical simulating device based on solvent-extracted coal seam reservoirs pressure break according to claim 1, is characterized in that: described well heater adopts annular infrared heater, and annular infrared heater is around being arranged on vacuum sample tank outside surface.
8. the physical simulating device based on solvent-extracted coal seam reservoirs pressure break according to claim 1, it is characterized in that: described end cap is threaded with vacuum sample tank, be provided with packoff between end cap and vacuum sample tank, packoff adopts rubber seal; Described pipeline adopts high-strength press solenoid.
9. utilize the analogy method of carrying out based on the physical simulating device of solvent-extracted coal seam reservoirs pressure break in claim 1 to 8 described in any one, it is characterized in that, comprise the following steps:
A: contrived experiment scheme, obtains the temperature of true coal seam reservoirs, pressure and property of water-bearing data, and according to the experiment effect intending obtaining, pressure needed for slective extraction liquid kind, concentration and pressure break;
B: the end cap opening vacuum sample tank, puts into vacuum sample tank by the column in simulation area or granular coal sample, then closes the end cap of vacuum sample tank;
C: start vacuum pump by inner for vacuum sample tank extracting vacuum;
D: start acoustic emission inductor and Acoustic radiating instrument, monitors the hole change caused because of the effect of pressure break extract real-time dynamicly;
E: open fillup valve and starting pressure pump, injects gas and mineralized water according to the pressure of the true coal seam reservoirs recorded and the property of water-bearing, the pressure of coal seam reservoirs and the property of water-bearing under Reality simulation state;
F: start annular infrared heater, carries out homogeneous heating to vacuum sample tank;
G: when the temperature and pressure in vacuum sample pot reaches after design temperature and pressure, starting pressure pump also injects the extract configured according to experimental program again, when reaching experimental program set pressure, closing presure pump and fillup valve;
H: close acoustic emission inductor and Acoustic radiating instrument, extracts acoustic emission data;
I: require to leave standstill according to experimental program until arrive setting-up time;
J: open recovery valve, and the gas and the liquid that start that gas-liquid separator reclaims generation in vacuum sample tank, the gas of recovery and liquid are stored in gas recovery tank and withdrawal liquid tank respectively; K: open the end cap of vacuum sample tank and take out coal sample, then opens gas recovery tank and withdrawal liquid tank takes out the gas and liquid that store.
10. analogy method of carrying out based on the physical simulating device of solvent-extracted coal seam reservoirs pressure break according to claim 9, is characterized in that: in described steps A, and extract adopts organic solvent and/or inorganic solvent; When injecting extract in step G, select the one in following several scheme:
(1) adopt organic solvent separately, utilize organic solvent to be pressed into coal sample as fracturing liquid, weaken the intermolecular association bonding force in texture of coal cross-linked network, by small molecular phase stripping;
(2) adopt inorganic solvent separately, utilize the acidization of the mineral acid in inorganic solvent to be dissolved by the mineral matter in coal;
(3) organic mixed solvent of different ratio or inorganic mixed solvent is selected, to strengthen mixed solvent to the expansion in coal mesopore crack and anti-reflection action effect in press-in coal sample;
(4), after first utilizing the mineral acid in inorganic solvent to carry out acidification, recycling organic solvent carries out organic extraction; Or first organic solvent is pressed into, and then utilizes the mineral acid in inorganic solvent to carry out acidification, coal mesopore crack is expanded and anti-reflection effect up hill and dale.
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2015
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