CN103291251B - Coal reservoir fracture gas, water flow conductivity dynamic change simulating test device - Google Patents
Coal reservoir fracture gas, water flow conductivity dynamic change simulating test device Download PDFInfo
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Abstract
Coal reservoir fracture gas, water flow conductivity dynamic change simulating test device, comprise coal seam reservoirs water, gas feed system, coal reservoir fracture simulation system, water, gas separating and measuring system and data monitoring acquisition system; The outlet of coal seam reservoirs water, gas feed system is connected with the import of coal reservoir fracture simulation system, and the outlet of coal reservoir fracture simulation system is connected with water, gas separating and measuring system.The present invention can simulate stress state suffered by coal seam reservoirs, the change of different confined pressure, different mining stage, different crack length, Fracture Width, the lower coal reservoir fracture flow conductivity of crack combination is compared and tests accurately, for the formulation of coal bed gas well mining working system provides theoretical foundation.The mining process of simulation coal bed gas well, combine in different crack coal seam Zhong Shui in coal bed gas well mining process, gas, Path selection under the condition such as different pressures sentences knowledge, providing theory support for studying coal bed gas well gas production mechanism.
Description
Technical field
The invention belongs to coal bed gas safety production technique field, particularly relate to a kind of coal reservoir fracture gas, water flow conductivity dynamic change simulating test device.
Background technology
Coal bed gas is mainly composed with adsorbed state to be existed in coal seam reservoirs, and at present, ground coal bed gas mainly makes the pressure of coal seam reservoirs reduce by the water in pump drainage coal seam reservoirs, coal bed gas desorb output.The otherness of the flow distance of water, the selection in flow process path etc. in the crack combination of the size of coal reservoir fracture, length, different length, width, coal seam, all by the number of production water when affecting coal bed gas well mining, and the number of production water can affect the reduction amplitude of pressure within the scope of coal bed gas well aerogenesis to a certain extent, finally have impact on the gas production of coal bed gas well.
Coal seam reservoirs is in three dimensions, the output of water, the power suffered by crack in coal seam reservoirs, matrix of coal is increased, the part of coal reservoir fracture can be caused to close, the crack that part is closed, causes coal reservoir fracture flow conductivity to change.The change of crack flow conductivity, by the aquifer yield of coal bed gas well when affecting follow-up mining, finally have impact on the gas production of coal bed gas well.
During coal bed gas well mining, generally experiencing the three phases such as saturation water single-phase flow, unsaturated water single-phase flow, air-water two phase flow stage.During mining, the change of phase causes the change of the main control factor affecting coal bed gas well gas production.When the mining of coal bed gas well from only draining to gas, water simultaneously mining time, gas and water share coal reservoir fracture passage, gas output number, water flow out number etc. the difference difference that all will coal reservoir fracture be caused to close degree, these also can affect the gas production of coal bed gas well.
As fully visible, in the complexity of coal seam reservoirs crack combination own, mining process, the diversity of water flow Path selection, air water coupling are to the polytropy of Effect of Fissure, the otherness in water, gas source during mining, all by the change of crack flow conductivity when causing coal bed gas well mining, finally have impact on the gas production of coal bed gas well.Find out that the impact of these conditions on coal bed gas well is the basis optimizing coalbed methane reservoir reforming technology technology, the formulation of mining control working system.But at present, also do not have a kind of device of comparative maturity can carry out dynamic monitoring to the change of crack flow conductivity in mining process under different situations.Therefore, need a kind of equipment badly to simulate above-mentioned different situations, finally find out different cranny development degree, different produce the change of coal reservoir fracture flow conductivity and the impact on coal bed gas well gas production in the situation such as water, aerogenesis, to for coal bed gas well reservoir reconstruction process optimization, mining working system is formulated provides theoretical foundation.
Summary of the invention
Deficiency and defect in order to solve prior art existence that the present invention will solve, a kind of coal reservoir fracture gas, water flow conductivity dynamic change simulating test device are provided, this device can the change in crack causes in real simulation coal output layer gas mining process product water, aerogenesis difference, to for coal bed gas well reservoir reconstruction process optimization, mining working system is formulated provides theoretical foundation.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: coal reservoir fracture gas, water flow conductivity dynamic change simulating test device, comprise coal seam reservoirs water, gas feed system, coal reservoir fracture simulation system, water, gas separating and measuring system and data monitoring acquisition system; The outlet of coal seam reservoirs water, gas feed system is connected with the import of coal reservoir fracture simulation system, and the outlet of coal reservoir fracture simulation system is connected with water, gas separating and measuring system; Coal seam reservoirs water, gas feed system, coal reservoir fracture simulation system, water, gas separating and measuring system are connected by data wire 24 with data monitoring acquisition system respectively.
Described coal seam reservoirs water, gas feed system comprises methane gas cylinder 1, water tank 2, first water pipe 21, first tracheae 22, gas-water mixer 7 and current equalizer 8, the gas outlet of methane gas cylinder 1 is connected with the import of gas-water mixer 7 by the first tracheae 22, the delivery port of water tank 2 is connected with the import of gas-water mixer 7 by the first water pipe 21, and the first water pipe 21 is provided with the first valve 3a successively along water (flow) direction, injection pump 4 and first flow sensing gauge 6a, the first tracheae 22 is provided with the second valve 3b successively along airflow direction, first air compressor 5a and the second flow sensing gauge 6b, gas-water mixer 7 extend in current equalizer 8 by the first air water pipe 23, the import department of gas-water mixer 7 is provided with the 5th valve 3e, first air water pipe 23 is provided with the 6th valve 3f, the outlet of the first air water pipe 23 is provided with nozzle 9, gas-water mixer 7 is provided with the first pressure sensing meter 10a, and current equalizer 8 is provided with the second pressure sensing meter 10b, the first valve 3a, second valve 3b, 5th valve 3e, first flow sensing gauge 6a, second flow sensing gauge 6b, first pressure sensing meter 10a is connected with data monitoring acquisition system respectively by described data wire 24 with the second pressure sensing meter 10b.
Described first water pipe 21 is connected with the first air water pipe 23 by the second water pipe 25 in the exit of first flow sensing gauge 6a, second water pipe 25 is provided with the 3rd valve 3c, first tracheae 22 is connected with the first air water pipe 23 by the second tracheae 26 in the exit of the second flow sensing gauge 6b, and the second tracheae 26 is provided with the 4th valve 3d.
Described coal reservoir fracture simulation system comprises the second air water pipe 27, base 14, pole 12, clamping device 15, fixed mechanism 13, crack pipe mold 11 and provide the confined pressure mechanism of confined pressure for crack pipe mold 11 outside, second air water pipe 27 two ends are connected with the outlet of current equalizer 8 and the import of crack pipe mold 11 respectively, second air water pipe 27 is provided with the 7th valve 3g and the 3rd pressure sensing meter 10c, pole 12 is vertically located on base 14, crack pipe mold 11 is located on pole 12 by clamping device 15, adjacent two bases 14 are connected to one by fixed mechanism 13, 7th valve 3g is connected with data monitoring acquisition system respectively by described data wire 24 with the 3rd pressure sensing meter 10c.
Described crack pipe mold 11 comprises body 28, linearly or the bending of body 28, be provided with the crack pipe 29 be connected with the second air water pipe 27 in body 28, be filled with proppant in crack pipe 29, the cavity formed between body 28 with crack pipe 29 is connected with confined pressure mechanism.
Described confined pressure mechanism comprises helium gas cylinder 16 and the 3rd tracheae 30, the two ends of the 3rd tracheae 30 are connected with the gas outlet of helium gas cylinder 16 and cavity respectively, 3rd tracheae 30 is provided with the 8th valve 3h, the second air compressor 5b and the 4th pressure sensing meter 10d successively along airflow direction, and the 4th pressure sensing meter 10d is connected with data monitoring acquisition system by described data wire 24.
Described pole 12 is provided with jack 31 from top to bottom, clamping device 15 comprises the first grip block 32 and the second grip block 33 removably connected by screw 34, there is between first grip block 32 and the second grip block 33 row and be provided with for the two ends of clamping hole 35, second grip block 33 clamping crack pipe mold 11 inserted link 36 extend in jack 31.
Described fixed mechanism comprises two screw rods 37 being located at two outermost four pole 12 outsides of base 14, phase the same side of two screw rods 37 connects respectively by the pressing plate 38 that a piece is located on screw rod 37, and screw rod 37 is provided with the nut 39 for clam member 38.
Described water, gas separating and measuring system comprises the 3rd air water pipe 40, moisture trap 17, air bag 18 and water bottle 19, the two ends of the 3rd air water pipe 40 are connected with the outlet of crack pipe mold 11 and the import of moisture trap 17 respectively, 3rd air water pipe 40 is provided with the 5th pressure sensing meter 10e and the 9th valve 3i, the 4th tracheae 41 is provided with between the gas outlet of moisture trap 17 and the air inlet port of air bag 18, 4th tracheae 41 is provided with the 3rd flow sensing meter 6c and the tenth valve 3j, the 3rd water pipe 42 is provided with between the delivery port of moisture trap 17 and the water inlet of water bottle 19, 3rd water pipe 42 is provided with the 4th flow sensing meter 6d and the 11 valve 3k, 5th pressure sensing meter 10e, 3rd flow sensing meter 6c is connected with data monitoring acquisition system respectively by described data wire 24 with the 4th flow sensing meter 6d.
Described data monitoring acquisition system is the computer 20 being provided with data monitoring collection analysis software.
The water of discharging and gas in coal seam reservoirs and country rock when coal seam reservoirs water in the present invention, the effect of gas feed system are simulation coal bed gas well minings, provide water and gas in coal reservoir fracture simulation system.Coal reservoir fracture simulation system can simulate the coal petrography crack form in reservoir under the crack combination condition such as different size, different length, different directions, different filled sections.The effect of water, gas separating and measuring system is separated with gas by the water flowed out in the pipe mold of crack, and test out the flow of crack Guan Zhongqi and water.The main computer being provided with data acquisition software of data monitoring acquisition system forms, Main Function is that the data such as pressure, flow, time of real time record in each system are transferred to computer, can analyze according to data, draw the change of crack flow conductivity under different situations.
The complexity etc. that instant invention overcomes Crack change in the diversity of coal seam reservoirs crack form own, coal bed gas well mining process causes accurately obtaining the aerogenesis contribution of these changes on coal bed gas well and the problem of impact.The present invention can simulate stress state suffered by coal seam reservoirs, the change of different confined pressure, different mining stage, different crack length, Fracture Width, the lower coal reservoir fracture flow conductivity of crack combination is compared and tests accurately, for coal bed gas well mining working system provides theoretical foundation.The mining process of simulation coal bed gas well, combine in different crack coal seam Zhong Shui in coal bed gas well mining process, gas, Path selection under the condition such as different pressures sentences knowledge, providing theory support for studying coal bed gas well gas production mechanism.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of the embodiment one of crack pipe mold in the present invention;
Fig. 3 is the structural representation of the embodiment two of crack pipe mold in the present invention;
Fig. 4 is the structural representation of the embodiment one of crack pipe in the present invention;
Fig. 5 is the structural representation of the embodiment two of crack pipe in the present invention;
Fig. 6 is the structural representation of clamping device in the present invention;
Fig. 7 is the structural representation of base in the present invention, pole and fixed mechanism 13;
Fig. 8 is the A-A direction view of base and pole in Fig. 7;
Fig. 9 is the top view of Fig. 7.
Detailed description of the invention
As shown in Fig. 1 ~ Fig. 9, coal reservoir fracture gas of the present invention, water flow conductivity dynamic change simulating test device, comprise coal seam reservoirs water, gas feed system, coal reservoir fracture simulation system, water, gas separating and measuring system and data monitoring acquisition system; The outlet of coal seam reservoirs water, gas feed system is connected with the import of coal reservoir fracture simulation system, and the outlet of coal reservoir fracture simulation system is connected with water, gas separating and measuring system; Coal seam reservoirs water, gas feed system, coal reservoir fracture simulation system, water, gas separating and measuring system pass through the dotted line in data wire 24(Fig. 1 with data monitoring acquisition system respectively) be connected.
Coal seam reservoirs water, gas feed system comprises methane gas cylinder 1, water tank 2, first water pipe 21, first tracheae 22, gas-water mixer 7 and current equalizer 8, the gas outlet of methane gas cylinder 1 is connected with the import of gas-water mixer 7 by the first tracheae 22, the delivery port of water tank 2 is connected with the import of gas-water mixer 7 by the first water pipe 21, and the first water pipe 21 is provided with the first valve 3a successively along water (flow) direction, injection pump 4 and first flow sensing gauge 6a, the first tracheae 22 is provided with the second valve 3b successively along airflow direction, first air compressor 5a and the second flow sensing gauge 6b, gas-water mixer 7 extend in current equalizer 8 by the first air water pipe 23, the import department of gas-water mixer 7 is provided with the 5th valve 3e, first air water pipe 23 is provided with the 6th valve 3f, the outlet of the first air water pipe 23 is provided with nozzle 9, gas-water mixer 7 is provided with the first pressure sensing meter 10a, and current equalizer 8 is provided with the second pressure sensing meter 10b, the first valve 3a, second valve 3b, 5th valve 3e, first flow sensing gauge 6a, second flow sensing gauge 6b, first pressure sensing meter 10a is connected with data monitoring acquisition system respectively by described data wire 24 with the second pressure sensing meter 10b.
First water pipe 21 is connected with the first air water pipe 23 by the second water pipe 25 in the exit of first flow sensing gauge 6a, second water pipe 25 is provided with the 3rd valve 3c, first tracheae 22 is connected with the first air water pipe 23 by the second tracheae 26 in the exit of the second flow sensing gauge 6b, and the second tracheae 26 is provided with the 4th valve 3d.Water or methane gas can be made so directly not to enter into current equalizer 8 by gas-water mixer 7.
Coal seam reservoirs water, gas feed system are mainly used to provide different flow in coal reservoir fracture simulation system, the water under different pressures, different in flow rate condition and gas.
Methane gas cylinder 1 is mainly used to provide methane gas; Water tank 2 is used to provide water source, and water tank 2 is cuboids, and length is respectively 2m × 1m × 1m; First air compressor 5a and injection pump 4 are respectively by the water injected gas water mixer 7 in the gas in methane gas cylinder 1 and water tank 2.The fluid chemical field that first tracheae 22 and the first water pipe 21 mainly enter by gas-water mixer 7 is even.
Current equalizer 8 is the easy device of designed, designed, for rectangular shape, length, width and height are respectively 300mm × 200mm × 200mm, import is in the position, middle, top of current equalizer 8, at current equalizer 8, inner import department is provided with nozzle 9, it is rectangle bottom nozzle 9, size is 180mm × 60mm, the effect of nozzle 9 mainly will enter into the fluid spray of current equalizer 8 in the bottom of current equalizer 8, export the position, middle in current equalizer 8 bottom, outlet opening is two rows, totally 10, 10 crack pipe molds can be connected, distance between outlet opening is 30mm, pore size is 15mm, current equalizer 8 is provided with the second pressure sensing meter 10b, the pressure drawing current equalizer 8 inside can be tested, the Main Function of current equalizer 8 is by water, air-flow body is evenly distributed in each crack pipe mold 11.
Coal reservoir fracture simulation system comprises the second air water pipe 27, base 14, pole 12, clamping device 15, fixed mechanism 13, crack pipe mold 11 and provide the confined pressure mechanism of confined pressure for crack pipe mold 11 outside, second air water pipe 27 two ends are connected with the outlet of current equalizer 8 and the import of crack pipe mold 11 respectively, second air water pipe 27 is provided with the 7th valve 3g and the 3rd pressure sensing meter 10c, pole 12 is vertically located on base 14, crack pipe mold 11 is located on pole 12 by clamping device 15, adjacent two bases 14 are connected to one by fixed mechanism 13, 7th valve 3g is connected with data monitoring acquisition system respectively by described data wire 24 with the 3rd pressure sensing meter 10c.
Crack pipe mold 11 comprises body 28, linearly or the bending of body 28, the crack pipe 29 be connected with the second air water pipe 27 is provided with in body 28, proppant is filled with in crack pipe 29, proppant is made up of quartz sand, walnut shell, glass marble etc., and the cavity formed between body 28 with crack pipe 29 is connected with confined pressure mechanism.
Confined pressure mechanism comprises helium gas cylinder 16 and the 3rd tracheae 30, the two ends of the 3rd tracheae 30 are connected with the gas outlet of helium gas cylinder 16 and cavity respectively, 3rd tracheae 30 is provided with the 8th valve 3h, the second air compressor 5b and the 4th pressure sensing meter 10d successively along airflow direction, and the 4th pressure sensing meter 10d is connected with data monitoring acquisition system by described data wire 24.
Pole 12 is provided with jack 31 from top to bottom, clamping device 15 comprises the first grip block 32 and the second grip block 33 removably connected by screw 34, there is between first grip block 32 and the second grip block 33 row and be provided with for the two ends of clamping hole 35, second grip block 33 clamping crack pipe mold 11 inserted link 36 extend in jack 31.
Phase the same side that fixed mechanism comprises two screw rods, 37, two screw rods 37 being located at two outermost four pole 12 outsides of base 14 connects respectively by the pressing plate 38 that a piece is located on screw rod 37, and screw rod 37 is provided with the nut 39 for clam member 38.
Coal reservoir fracture simulation system is mainly used to the coal petrography crack under different directions under Reality simulation reservoir conditions, different length, different size cracks combination condition.
Crack pipe mold 11 is made up of body 28 and crack pipe 29 etc.The body 28 of crack pipe mold 11 is made up of pmma material, organic glass has high voltage bearing feature, modulus of elasticity 3 first grip block about 32Pa, close with the modulus of elasticity of coal, body 28 diameter is 30mm, length has 100mm, 200mm, 300mm, 400mm, 500mm, the specification that 600mm is different, if Fig. 2 is linear crack pipe mold 11, simultaneously in order to simulate bending crack, some bodys 28 bend 30 °, 45 °, 60 °, the different angles such as 90 °, be illustrated in figure 3 the crack pipe mold 11 of flexure type, body 28 wall thickness is 10mm, body 28 sidewall upper has an aperture to be the circular hole of 5mm, circular hole is connected with confined pressure, can by circular hole to injecting gas in the cavity between body 28 and crack pipe 29, utilize the pressure of gas to simulate the pressure of crack pipe 29 outside, crack pipe 29 is evenly arranged in body 28, the crack pipe 29 of 16 same apertures and length is had in each crack pipe mold 11, arrange in crack pipe mold 11 that the reason of 16 crack pipes 29 is: when the aperture of crack pipe 29 is less, fluid flow in crack pipe 29 is also less, the fluid flow use traffic sensing gauge of Single fracture pipe 29 is not easy test, so the crack pipe 29 that in crack pipe mold 11, layout 16 is identical, the flow of Single fracture pipe 29 is drawn by the flow tested in whole crack pipe mold 11, the entrance point of body 28 and the port of export have one with the annulus in 16 holes, annulus is in the inside of body 28, crack pipe 29 is located in the hole of annulus and connects as one, then the fluid entering body 28 is entering into 16 crack pipes 29.Crack pipe mold 11 import and outlet are separately installed with the 3rd pressure sensing meter 10c and the 4th pressure sensing meter 10d, can monitor the pressure of crack pipe mold 11 import and outlet, and be transferred to data monitoring acquisition system.
Crack pipe 29 is also made up of pmma material, is located at body 28 inner.Crack pipe 29 wall thickness is 2mm, the aperture of some crack pipes 29 is identical (as shown in Figure 4), aperture has the specification that 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm are different respectively, the aperture of some crack pipe 29 inside is changes (as shown in Figure 5), can be combined according to different length ratios by the crack pipe 29 of two or more different pore sizes, but the total length of crack pipe 29 is constant, crack pipe 29 total length has the specification that 80mm, 180mm, 280mm, 380mm, 480mm, 580mm are different respectively.Corresponding with body 28, some crack pipes 29 are also bending, and the different angles such as bending 30 °, 45 °, 60 °, 90 °, combine with body 28, simulate bending crack respectively.The internal diameter size of crack pipe 29 can be used for simulating the opening width in coal petrography crack, the varying aperture of same crack pipe 29 simulates the change of cracks aperture, the bending change of simulating a fracture strike of crack pipe 29, the length of crack pipe 29 is used for simulating the length in crack, different crack pipe molds 11 is combined by fixed mechanism, can simulate whole coal petrography Fracture Networks.Quartz sand or the proppant such as walnut shell or glass marble can be placed in crack pipe 29, simulate the supporting role of different proppants to coal petrography crack.
Second air compressor 5b is mainly used to injecting gas in the cavity between body 28 and crack pipe 29, utilizes the gas pressure injected as the pressure of crack pipe 29 outside, is used for simulating the confined pressure of outside, crack.
The effect of base 14, pole 12, clamping device 15 and fixed mechanism 13 is fixed together according to different angles by the crack pipe mold 11 of different size length.
Base 14 is cuboid steel plate, length, width and height are respectively 600mm × 100mm × 10mm, row's pole 12 is arranged in base 14 middle, and totally 5, pole 12 is vertically welded on base 14, distance between two poles 12 is 100mm, pole 12 is the steel pipe of external diameter 20mm, wall thickness 5mm, and pole 12 is long is 700mm, the tube wall of pole 12 side just there is the jack 31 of an aperture 12mm every 25mm, the inserted link 36 at the two ends of the second grip block 33 can be inserted in the jack 31 of different pole 12.
Clamping device 15 is primarily of the first grip block 32 and second grip block 33 two parts composition, as shown in Figure 6, crack pipe mold 11 can be fixed in the clamping hole 35 between the first grip block 32 and the second grip block 33 by clamping device 15, first grip block 32 and the second grip block 33 are fixed together by screw 34, first grip block 32 be long for 550mm, wide be 20mm, thick be the steel disc of 5mm, steel disc there is a jaws every 50mm, in the middle of two jaws, has diameter to be the hole of 5mm; Second grip block 33 mid portion is identical with the first grip block 32, and it is 30mm that two ends are welded with long respectively, and diameter is the inserted link 36 of 10mm, and inserted link 36 can be inserted in the jack 31 of diameter 12mm on pole 12.Be the hole of 5mm by the diameter between the first grip block 32 and the second grip block 33, with screw 34 by the first grip block 32 part and the second grip block 33 part by being fixed together, one or more cracks pipe mold 11 is placed in clamping hole 35, thus is fixed together with clamping device 15.Generally, crack pipe mold 11 needs two clamping devices 15 to fix, then different clamping device 15 two ends can be inserted in the eyelet of different base 14 upper rack posts 12, be inserted in by the inserted link 36 at the two ends by the second grip block 33 angle that different jack 31 li adjusts crack pipe mold 11.
Fixed mechanism 13 Main Function is fixed together by two bases 14, forms primarily of two panels pressing plate 38 and two screw rods 37, and pressing plate 38 is long is 600mm, and wide is 20mm, and thick is 10mm, and 50mm place, pressing plate 38 two ends has an aperture to be the hole of 12mm; Screw rod 37 is long is 600mm, and diameter is 10mm, screw rod 37 has screw thread, is clipped in the middle by two bases 14 with two panels pressing plate 38, and two screw rods 37 are inserted in the socket at pressing plate 38 two ends respectively, fastening by nut 39.
Water, gas separating and measuring system comprises the 3rd air water pipe 40, moisture trap 17, air bag 18 and water bottle 19, the two ends of the 3rd air water pipe 40 are connected with the outlet of crack pipe mold 11 and the import of moisture trap 17 respectively, 3rd air water pipe 40 is provided with the 5th pressure sensing meter 10e and the 9th valve 3i, the 4th tracheae 41 is provided with between the gas outlet of moisture trap 17 and the air inlet port of air bag 18, 4th tracheae 41 is provided with the 3rd flow sensing meter 6c and the tenth valve 3j, the 3rd water pipe 42 is provided with between the delivery port of moisture trap 17 and the water inlet of water bottle 19, 3rd water pipe 42 is provided with the 4th flow sensing meter 6d and the 11 valve 3k, 5th pressure sensing meter 10e, 3rd flow sensing meter 6c is connected with data monitoring acquisition system respectively by described data wire 24 with the 4th flow sensing meter 6d.
The effect of aqueous vapor separating and measuring system is that the aqueous vapor that flowed out by crack pipe mold 11 is separated, and tests give vent to anger and the flow of water.Moisture trap 17 Main Function is by the gas-water separation of output in crack pipe mold 11.3rd flow sensing meter 6c and the 4th flow sensing meter 6d is arranged on the 4th tracheae 41 after gas-water separation and the 3rd water pipe 42 respectively, is used for measuring the flow of gas and water after gas-water separation.Air bag 18 is used for receiving the gas of output, and water bottle 19 is used for receiving the water of output.
Data monitoring acquisition system forms primarily of the computer 20 that is provided with data monitoring collection analysis software.
Computer 20 is connected with some pressure sensors in each system, flow transmitter, Main Function is in data monitoring acquisition system by data acquisitions such as the pressure of real time record, flow, times, online display in real time can be carried out on the one hand to the data collected, the data analysis process that can will collect on the one hand, analytical calculation show that Single fracture and whole reservoir fracture network produce water gas deliverability and produce the change of water gas deliverability.
The present invention, when working use, can carry out according to following experimental procedure:
(1) experimental facilities is connected
Experimentally arrange, select pore footpath, different crack, the crack pipe mold 11 of different length, differently curved degree, and proppant (quartz sand, walnut shell, glass marble) is put into the crack pipe 29 of crack pipe mold 11, different crack pipe molds 11 is adjusted to different angles (depicting schematic diagram when only having a kind of crack pipe mold 11 in Fig. 1), by base 14, pole 12, clamping device 15 and fixed mechanism 13, crack pipe mold 11 is fixed up.According to experimental facilities schematic diagram 1, system components is assembled.
(2) airtight test
The tightness of the experimental facilities after connection is checked.
(3) experiment test
A. initial crack flow conductivity test
The air pressure of crack pipe mold 11 is set, the stress be used for suffered by Reality simulation reservoir.Then pass into high-pressure helium, by test traffic and pressure, the flow conductivity of every root crack pipe 29 is calculated.Design formulas is:
In formula:
k gas for gas phase permeability, m
2;
p 1 for inlet pressure, MPa;
p 2 for outlet pressure, can atmospheric pressure be designated as herein, 0.101MPa,
q gas for gas flow, m
3/ s;
μ gas for gas viscosity, mPas;
lfor crack length of tube, m;
afor crack pipe cross-sectional area, m
2.
B. the test of initial water phase permeability enters the liquid of certain pressure by infusion, tests its flow and pressure, utilizes formula below to draw water phase permeability.
In formula:
k water for water phase permeability, mD;
p 1 for inlet pressure, MPa;
p 2 for outlet pressure, atmospheric pressure can be designated as herein, 0.101MPa;
q water for the flow of water, m
3/ s;
μ water for the viscosity of water, mPas;
lfor crack length of tube, m;
afor crack pipe cross-sectional area, m
2.
C. mixing wastewater with air phase permeability test under different gas, water pressure
Gas, water mixing, by arranging pressure, must to give vent to anger, gas phase relative permeability and aqueous phase relative permeability under water mixed phase.
D. saturation water stage crack flow conductivity test in mining process
Simulate the change of effective stress suffered by reservoir in saturation water process by arranging different confined pressures, water phase permeability under different confined pressure is tested.Method of testing as before
E. gas, the test of water two phase flow stage crack flow conductivity in mining process
By arranging, different confined pressures is gentle, water blend pressure and flow, simulate the change of gas production and aquifer yield in mining process, and the permeability test carried out under different confined pressure, different gas, water blend pressure and different flow, draw the change of gas in mining process, water two phase flow stage crack flow conductivity.
Concrete test is, first open the 8th valve 3h of helium gas cylinder 16, gases at high pressure are injected to the outside of crack pipe 29 in crack pipe mold 11 by the second air compressor 5b, serve as the confined pressure of crack pipe 29 outside, the gas pressure injected in different crack pipe molds 11 is identical, when reaching design pressure, stop injecting.
Then by computer 20, open the first valve 3a of water tank 2, the second valve 3b of methane gas cylinder 1 and air water gaseous mixture front end the 5th valve 3e, in gas-water mixer 7, certain volume gas and water is injected by the first tracheae 22 and the first water pipe 21, when in gas-water mixer 7, pressure reaches design pressure, close above-mentioned valve, stop injecting.
Then, open the 6th valve 3f of the tenth valve 3j of air bag 18 front portion, the 9th valve 3i of water bottle 19 front portion, the 7th valve 3g of crack pipe mold 11 and current equalizer 8 front portion, start to carry out experiment test.
And then different confined pressures is set, repeat above-mentioned steps, until reach the data of test.
F. the flow conductivity test under the combination of different cracks
The combination of crack pipe 29 can be changed, or add varigrained proppant in crack pipe 29, form different crack combinations, repeat said process and test.
(4) experimental result process
According to the data gathered, carry out analyzing and processing, calculate the change at different confined pressure, different gas production, different aquifer yield, the crack flow conductivity in different mining stage of Single fracture and whole Fracture Networks.
(5) equipment Removal and arrangement
After having tested, remove and arrange each several part experimental facilities.
Claims (7)
1. coal reservoir fracture gas, water flow conductivity dynamic change simulating test device, is characterized in that: comprise coal seam reservoirs water, gas feed system, coal reservoir fracture simulation system, water, gas separating and measuring system and data monitoring acquisition system; The outlet of coal seam reservoirs water, gas feed system is connected with the import of coal reservoir fracture simulation system, and the outlet of coal reservoir fracture simulation system is connected with water, gas separating and measuring system; Coal seam reservoirs water, gas feed system, coal reservoir fracture simulation system, water, gas separating and measuring system are connected by data wire (24) with data monitoring acquisition system respectively;
Described coal seam reservoirs water, gas feed system comprises methane gas cylinder (1), water tank (2), first water pipe (21), first tracheae (22), gas-water mixer (7) and current equalizer (8), the gas outlet of methane gas cylinder (1) is connected with the import of gas-water mixer (7) by the first tracheae (22), the delivery port of water tank (2) is connected with the import of gas-water mixer (7) by the first water pipe (21), first water pipe (21) is provided with the first valve (3a) successively along water (flow) direction, injection pump (4) and first flow sensing gauge (6a), first tracheae (22) is provided with the second valve (3b) successively along airflow direction, first air compressor (5a) and the second flow sensing gauge (6b), gas-water mixer (7) extend in current equalizer (8) by the first air water pipe (23), the import department of gas-water mixer (7) is provided with the 5th valve (3e), first air water pipe (23) is provided with the 6th valve (3f), the outlet of the first air water pipe (23) is provided with nozzle (9), gas-water mixer (7) is provided with the first pressure sensing meter (10a), current equalizer (8) is provided with the second pressure sensing meter (10b), first valve (3a), second valve (3b), 5th valve (3e), first flow sensing gauge (6a), second flow sensing gauge (6b), first pressure sensing meter (10a) is connected with data monitoring acquisition system respectively by described data wire (24) with the second pressure sensing meter (10b),
Described first water pipe (21) is connected with the first air water pipe (23) by the second water pipe (25) in the exit of first flow sensing gauge (6a), second water pipe (25) is provided with the 3rd valve (3c), first tracheae (22) is connected with the first air water pipe (23) by the second tracheae (26) in the exit of the second flow sensing gauge (6b), and the second tracheae (26) is provided with the 4th valve (3d);
Described coal reservoir fracture simulation system comprises the second air water pipe (27), base (14), pole (12), clamping device (15), fixed mechanism (13), crack pipe mold (11) and provide the confined pressure mechanism of confined pressure for crack pipe mold (11) outside, second air water pipe (27) two ends are connected with the outlet of current equalizer (8) and the import of crack pipe mold (11) respectively, second air water pipe (27) is provided with the 7th valve (3g) and the 3rd pressure sensing meter (10c), pole (12) is vertically located on base (14), crack pipe mold (11) is located on pole (12) by clamping device (15), adjacent two bases (14) are connected to one by fixed mechanism (13), 7th valve (3g) is connected with data monitoring acquisition system respectively by described data wire (24) with the 3rd pressure sensing meter (10c).
2. coal reservoir fracture gas according to claim 1, water flow conductivity dynamic change simulating test device, it is characterized in that: described crack pipe mold (11) comprises body (28), linearly or the bending of body (28), be provided with the crack be connected with the second air water pipe (27) in body (28) to manage (29), be filled with proppant in crack pipe (29), body (28) is managed the cavity formed between (29) and is connected with confined pressure mechanism with crack.
3. coal reservoir fracture gas according to claim 2, water flow conductivity dynamic change simulating test device, it is characterized in that: described confined pressure mechanism comprises helium gas cylinder (16) and the 3rd tracheae (30), the two ends of the 3rd tracheae (30) are connected with the gas outlet of helium gas cylinder (16) and cavity respectively, 3rd tracheae (30) is provided with the 8th valve (3h) successively along airflow direction, second air compressor (5b) and the 4th pressure sensing meter (10d), 4th pressure sensing meter (10d) is connected with data monitoring acquisition system by described data wire (24).
4. coal reservoir fracture gas according to claim 1, water flow conductivity dynamic change simulating test device, it is characterized in that: described pole (12) is provided with jack (31) from top to bottom, clamping device (15) comprises the first grip block (32) and the second grip block (33) that are removably connected by screw (34), have a row between first grip block (32) and the second grip block (33) for clamping the clamping hole (35) of crack pipe mold (11), the two ends of the second grip block (33) are provided with the inserted link (36) extend in jack (31).
5. coal reservoir fracture gas according to claim 4, water flow conductivity dynamic change simulating test device, it is characterized in that: described fixed mechanism comprises two screw rods (37) being located at two outermost four poles (12) outsides of base (14), phase the same side of two screw rods (37) connects respectively by the pressing plate (38) that a piece is located on screw rod (37), and screw rod (37) is provided with the nut (39) for clam member (38).
6. coal reservoir fracture gas according to claim 1, water flow conductivity dynamic change simulating test device, it is characterized in that: described water, gas separating and measuring system comprises the 3rd air water pipe (40), moisture trap (17), air bag (18) and water bottle (19), the two ends of the 3rd air water pipe (40) are connected with the outlet of crack pipe mold (11) and the import of moisture trap (17) respectively, 3rd air water pipe (40) is provided with the 5th pressure sensing meter (10e) and the 9th valve (3i), the 4th tracheae (41) is provided with between the gas outlet of moisture trap (17) and the air inlet port of air bag (18), 4th tracheae (41) is provided with the 3rd flow sensing meter (6c) and the tenth valve (3j), the 3rd water pipe (42) is provided with between the delivery port of moisture trap (17) and the water inlet of water bottle (19), 3rd water pipe (42) is provided with the 4th flow sensing meter (6d) and the 11 valve (3k), 5th pressure sensing meter (10e), 3rd flow sensing meter (6c) is connected with data monitoring acquisition system respectively by described data wire (24) with the 4th flow sensing meter (6d).
7. coal reservoir fracture gas according to claim 1, water flow conductivity dynamic change simulating test device, is characterized in that: described data monitoring acquisition system is the computer (20) being provided with data monitoring collection analysis software.
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