CN105863596B - Underground coal mine ultrasonic wave and the compound fracturing coal body analogue experiment method of hydraulic fracturing - Google Patents

Underground coal mine ultrasonic wave and the compound fracturing coal body analogue experiment method of hydraulic fracturing Download PDF

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Publication number
CN105863596B
CN105863596B CN201610294713.2A CN201610294713A CN105863596B CN 105863596 B CN105863596 B CN 105863596B CN 201610294713 A CN201610294713 A CN 201610294713A CN 105863596 B CN105863596 B CN 105863596B
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China
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fracturing
coal
ultrasonic wave
seal groove
hydraulic fracturing
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CN201610294713.2A
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Chinese (zh)
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CN105863596A (en
Inventor
翟成
汤宗情
秦雷
徐吉钊
武世亮
仲超
孙勇
于国卿
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中国矿业大学
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25Methods for stimulating production
    • E21B43/26Methods for stimulating production by forming crevices or fractures
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B49/00Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells

Abstract

The invention discloses a kind of underground coal mine ultrasonic wave and the compound fracturing coal body simulator of hydraulic fracturing and method, including three axis pressue devices of closing, the compound fracturing device of ultrasonic wave hydraulic fracturing, pumping gas injection device and monitoring device;The compound fracturing device of ultrasonic wave hydraulic fracturing includes ultrasonic wave fracturing equipment and hydraulic fracturing equipment, and the pumping gas injection device includes vacuum pump and the gas gas injection bottle with pressure gauge;Coal sample is placed in the three axis pressue device, ultrasonic wave fracturing equipment and hydraulic fracturing equipment are connected by the compound fracturing device of ultrasonic wave hydraulic fracturing with the coal sample in three axis pressue devices of closing respectively by H-shaped steel pipe;Vacuum pump in the pumping gas injection device and the gas gas injection bottle with pressure gauge are connected respectively with the coal sample in three axis pressue devices of closing;The monitoring device is connected with the coal sample in three axis pressue devices of closing.The present invention can be with true and accurate simulation underground coal mine ultrasonic wave and the compound fracturing coal body process of hydraulic fracturing.

Description

Underground coal mine ultrasonic wave and the compound fracturing coal body analogue experiment method of hydraulic fracturing
Technical field
The present invention relates to a kind of ultrasonic waves and the experimental simulation device of the compound fracturing coal body of hydraulic fracturing, particularly a kind of coal Ore deposit downhole ultrasonic and the compound fracturing coal body simulator of hydraulic fracturing and method.
Background technology
Gas be China's coal-mine Frequent Accidents and it is serious the main reason for, as Coal Exploitation is deep and the increase of well yield, Gas emission is increasing, and Gas Outburst and gas explosion more and more become the most important difficulty that restriction safety of coal mines efficiently produces Topic.At present, gas pumping is to solve one of maximally efficient measure of Gas Disaster.China's complex geologic conditions, coal-bed gas pressure Power is high and mostly low air permeability coal seam, with adopting deep increase, currently used hydraulic fracturing, hydraulic slotted liner technique and presplit blasting etc. The coverage of measure can be restricted, and can not form large-scale fracture network using coal body after monotechnics measure, gas is taken out It is low to adopt efficiency, extracting result unobvious sometimes.
Ultrasonic technology as a kind of emerging technology pollution-free, efficiency is high, penetration capacity is strong, be widely used in life and Industrial every field.Research, which shows that ultrasonic wave has, reduces coal rock strength, excitation coal body fracturing and the work for promoting gasresolution With hydraulic fracturing has the advantages that technological process is simple, technically reliable, coverage is wide, together as traditional coal body fracturing means When hydraulic fracturing after the rise of coal seam moisture content, be conducive to expand ultrasonic propagation radius, and ultrasonic wave is conducive to mitigate waterpower pressure Water-blocking effect after splitting, ultrasonic wave, as emerging coal seam fracturing technology, have ultrasonic wave with the compound fracturing coal body of hydraulic fracturing With the two-fold advantage in hydraulic fracturing coal seam.
Laboratory is less to the research of ultrasonic wave and the compound fracturing coal body of hydraulic fracturing at present, and set of experimental provision is also not It is perfect.Theory analysis and numerical simulation are there are many desirabilities it is assumed that too big with down-hole coal bed actual occurrence status difference;Directly Connecing underground coal mine experiment, not only cost is huge, and dangerous high, each coal mine gas pressure, coal quality, stress state are also single , contingency probability is too big.Therefore, in order to more deeply probe into the mechanism and shadow of ultrasonic wave and the compound fracturing coal body of hydraulic fracturing The factor of sound designs a kind of underground coal mine ultrasonic wave and the compound fracturing coal body simulator of hydraulic fracturing, and carries out corresponding simulation Experiment is just particularly important.
The content of the invention
Goal of the invention:In order to overcome technical deficiency in the prior art, the present invention provides a kind of underground coal mine ultrasound Ripple and the compound fracturing coal body simulator of hydraulic fracturing and method, real simulation underground coal mine ultrasonic wave and the compound cause of hydraulic fracturing Split coal body process.
Technical solution:To achieve the above object, technical scheme is as follows:
Underground coal mine ultrasonic wave and the compound fracturing coal body simulator of hydraulic fracturing including three axis pressue devices of closing, surpass The compound fracturing device of sound wave hydraulic fracturing, pumping gas injection device and monitoring device;The compound cause of ultrasonic wave hydraulic fracturing Splitting device includes ultrasonic wave fracturing equipment and hydraulic fracturing equipment, and the pumping gas injection device includes vacuum pump and with pressure The gas gas injection bottle of table;Coal sample is placed in the three axis pressue device, the compound fracturing device of ultrasonic wave hydraulic fracturing leads to H-shaped steel pipe is crossed to be connected ultrasonic wave fracturing equipment and hydraulic fracturing equipment with the coal sample in three axis pressue devices of closing respectively;Institute The vacuum pump in pumping gas injection device and the gas gas injection bottle with pressure gauge are stated respectively with closing in three axis pressue devices Coal sample connects;The monitoring device is connected with the coal sample in three axis pressue devices of closing.
Further technical solution, three axis pressue devices of the closing include seal groove and sealing cover, the seal groove Thickness of slab is used to be welded for the steel plate of 17cm;The seal groove and sealing cover are bolted composition inner space by eight and are The square of length of side 45cm;There are three through hole, respectively upper hole, mesoporous and lower opening for the one side brill of the seal groove;Three through holes Center apart from seal groove distance from bottom is respectively respectively from top to bottom 26cm, 16cm and 6cm, aperture be respectively from top to bottom 1cm, 3cm and 1cm, three through holes are respectively intended to be attached across monitoring device, the compound fracturing device of ultrasonic wave hydraulic fracturing and pumping Gas gas injection device.
Further technical solution, two orthogonal sides of the seal groove are respectively equipped with a distance rod and lead to Hole, the sealing cover are set there are one thrust rod through-hole, distance rod are respectively arranged in three thrust rod through-holes, positioned at sealing One end of corresponding three distance rods is vertically connected with thrust plate inside slot, and the thrust plate is long 30cm, width 30cm, thickness 3cm Cuboid bloom, the thrust plate is close to squeezing action with coal sample;The distance rod is respectively between seal groove and sealing cover It is sealed by rubber ring, the rubber ring is embedded in the slot that seal groove and sealing cover steel wall mill out in advance.
The experimental method of underground coal mine ultrasonic wave and the compound fracturing coal body simulator of hydraulic fracturing, comprises the following steps:
S1:According to the difference of the measuring apparatus needed for experiment, in the one side cutting for the square coal sample that the length of side is 30cm, carve Using cutting face center as the center of circle after the completion of slot, an a diameter of 3cm is bored, depth is the drilling of 15cm;
S2:The probe and electric wire of monitoring device needed for testing are embedded in the slot carved in advance, are by length 15cm, H-shaped steel pipe one end that outer diameter is 3cm are inserted into drilling, and insertion depth 5cm uses anchoring adhesive between H-shaped steel pipe and coal wall The ultrasonic transducer for connecting live wire is sent into drilling, by engraving between ultrasonic transducer and H-shaped steel pipe inner wall by sealing Empty steel loop connection keeps there is gap between ultrasonic transducer and H-shaped steel pipe;
S3:The coal sample for connecting monitoring device is placed in seal groove, H-shaped steel pipe is aligned with the mesoporous of seal groove to be inserted Enter, until coal sample wall surface is bonded with seal groove internal face, the electric wire of monitoring device passes through sealing needed for experiment measurement Upper hole on slot is pierced by, and is sealed between electric wire and hole wall by anchoring adhesive;
S4:Sealing cover and seal groove are linked together using bolt, push 3 distance rods to coal sample, it after finishing will envelope It closes three axis pressue devices to be placed on triaxial pressure machine, 3 distance rods are corresponding with 3 press rods of triaxial pressure machine, realize coal Three axis of sample pressurizes;
S5:Using vacuum pump by lower opening to closing three axis pressue devices in vacuumize 12 it is small when, experimental difference It is filled with the gas of different volumes into three axis pressue devices of closing by lower opening using the gas gas injection bottle with pressure gauge, fills gas Air valve is closed after finishing, adjusts triaxial pressure machine and coal sample is caused to reach the triaxial stress needed for experiment;
S6:Difference according to experiment selects suitable mode using ultrasonic wave fracturing equipment and hydraulic fracturing equipment to coal sample Compound fracturing is carried out, and passes through monitoring device and gathers experimental data in real time.
Advantageous effect:The present invention is surpassed based on ultrasonic wave and a kind of underground coal mine of the compound fracturing coal body technology of hydraulic fracturing Sound wave and the compound fracturing coal body simulator of hydraulic fracturing and method, wherein:Ultrasonic wave is made with the compound fracturing coal body of hydraulic fracturing For a kind of new coal seam fracturing technology, have that speed of application is fast, energy density is big, coverage is wide, adaptation hard coal seam operation The advantages that, it is to solve the problems, such as one of maximally efficient measure of the hard low-air-permeability coal-bed gas extraction in China at present.It is of the invention first The a set of perfect ultrasonic wave of the simulation true occurrence status of underground coal mine Gas-bearing Coal Seams of secondary design and hydraulic fracturing compound cause Split coal body analogue experiment installation and application method.
The present invention uses the experimental method real simulation of analog simulation down-hole coal bed ambient stress and gas bearing situation, Compared with theory analysis and numerical simulation, closer to down-hole coal bed time of day, reliability, science and the essence of experimental data True property higher;Compared with field measurement, influenced by external force it is smaller, cost it is relatively low and meanwhile experiment can by adjust triaxial pressure and watt This pressure simulation different coal, adaptability are more extensive.Distance rod is sealed by the way of rubber ring is inlayed in sealing channel steel wall groove milling Gap between steel wall, voltage endurance capability higher, sealing effect are more preferable;Using H-shaped steel pipe connect respectively hydraulic fracturing equipment and Ultrasonic wave fracturing equipment has saved material and construction time while ensureing that two fracturing systems run well.
Description of the drawings
Fig. 1 is underground coal mine ultrasonic wave and the compound fracturing coal body simulator schematic diagram of hydraulic fracturing;
Fig. 2 is the front view of seal groove in Fig. 1;
Fig. 3 is the top view of seal groove in Fig. 1;
Fig. 4 is the top view of sealing cover in Fig. 1;
Fig. 5 is the front view of sealing cover in Fig. 1;
Fig. 6 is each instrument layout and connection diagram in main borehole in Fig. 1.
Specific embodiment
The present invention is further described below in conjunction with the accompanying drawings.
Such as Fig. 1, underground coal mine ultrasonic wave and the compound fracturing coal body simulator of hydraulic fracturing, including closing three axis pressurization dress It puts, the compound fracturing device 4 of ultrasonic wave hydraulic fracturing, pumping gas injection device 5 and monitoring device 3;The ultrasonic water forces Splitting compound fracturing device 4 includes ultrasonic wave fracturing equipment 4-1 and hydraulic fracturing equipment 4-2, and the pumping gas injection device 5 includes true The empty aspiration pump 5-2 and gas gas injection bottle 5-1 with pressure gauge;Coal sample 10, the ultrasound are placed in the three axis pressue device The compound fracturing device 4 of ripple hydraulic fracturing is distinguished ultrasonic wave fracturing equipment 4-1 and hydraulic fracturing equipment 4-2 by H-shaped steel pipe 18 It is connected with the coal sample 10 in three axis pressue devices of closing, the H-shaped steel pipe 18 of crossing is filled by rubber ring 8-1 and closing three axis pressurization Put sealing;Vacuum pump 5-2 in the pumping gas injection device 5 and gas gas injection bottle 5-1 with pressure gauge respectively with closing Coal sample 10 in three axis pressue devices connects;The monitoring device 3 is connected with the coal sample 10 in three axis pressue devices of closing.
Such as Fig. 2-5, three axis pressue devices of the closing include seal groove 1 and sealing cover 2, and the seal groove 1 uses plate Thickness is that the steel plate of 17cm is welded;The seal groove 1 and sealing cover 2 connect and compose inner space as side by eight bolts 16 The square of long 45cm;There are three through hole, respectively upper hole 9-1, mesoporous 9-2 and lower opening 9-3 for the one side brill of the seal groove 1; Three through hole centers apart from 1 distance from bottom of seal groove are respectively respectively from top to bottom 26cm, 16cm and 6cm, and aperture is from top to bottom Respectively 1cm, 3cm and 1cm, three through holes are respectively intended to be attached across monitoring device 3, the compound cause of ultrasonic wave hydraulic fracturing Split device 4 and pumping gas injection device 5.Two orthogonal sides of the seal groove 1 are respectively equipped with a thrust rod through-hole, The sealing cover 2 is set there are one thrust rod through-hole, distance rod 6 is respectively arranged in three thrust rod through-holes, positioned at sealing One end of corresponding three distance rods 6 in the inside of slot 1 is vertically connected with thrust plate 11, the thrust plate 11 is long 30cm, width 30cm, The cuboid bloom of thick 3cm, the thrust plate 11 are close to squeezing action with coal sample 10;The distance rod 11 respectively with seal groove 1 It is sealed between sealing cover 2 by rubber ring 8-1, the rubber ring 8-1 is embedded in the 2 advance milling of steel wall of seal groove 1 and sealing cover In the slot gone out.
Such as Fig. 1 and 6, the experimental method of underground coal mine ultrasonic wave and the compound fracturing coal body simulator of hydraulic fracturing, including Following steps:
S1:It is the one side cutting of the square coal sample 10 of 30cm in the length of side according to the difference of the measuring apparatus needed for experiment, Using cutting face center as the center of circle after the completion of cutting, an a diameter of 3cm is bored, depth is the drilling 21 of 15cm;
S2:The probe and electric wire of monitoring device 3 needed for testing are embedded in the slot carved in advance, are by length 15cm, 18 one end of H-shaped steel pipe that outer diameter is 3cm are inserted into drilling 21, and insertion depth 5cm is used between H-shaped steel pipe 18 and coal wall Anchoring adhesive 17 seals, and the ultrasonic transducer 20 for connecting live wire is sent into drilling 21, ultrasonic transducer 20 and H-shaped steel pipe It is connected between 18 inner walls by hollow out steel loop 19, keeps mutual gap between ultrasonic transducer 20 and H-shaped steel pipe 18;
S3:The coal sample 10 for connecting monitoring device 3 is placed in seal groove 1, in H-shaped steel pipe 18 and seal groove 1 Hole 9-2 alignment insertions, until 10 wall surface of coal sample is bonded with 1 internal face of seal groove, monitoring device 3 needed for experiment measurement Electric wire be pierced by by the upper hole 9-1 on seal groove, sealed between electric wire and hole wall by anchoring adhesive;
S4:Sealing cover 2 and seal groove 1 are linked together using bolt 16, push 3 distance rods 6 to coal sample 10, is completed Three axis pressue devices of closing are placed on triaxial pressure machine afterwards, 3 distance rods 6 are corresponding with 3 press rods of triaxial pressure machine, Realize the pressurization of three axis of coal sample;
S5:Using vacuum pump 5-2 by lower opening 9-3 to closing three axis pressue devices in vacuumize 12 it is small when, according to experiment Different different volumes are filled with into three axis pressue devices of closing by lower opening 9-3 using the gas gas injection bottle 5-1 with pressure gauge Gas, fill and air valve 12 closed after the completion of gas, adjust triaxial pressure machine and coal sample is caused to reach the triaxial stress needed for experiment;
S6:Difference according to experiment selects suitable mode using ultrasonic wave fracturing equipment and hydraulic fracturing equipment 4 to coal Sample carries out compound fracturing, and passes through the acquisition experimental data in real time of monitoring device 3.
The above is only the preferred embodiment of the present invention, it should be pointed out that:For the ordinary skill people of the art For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should It is considered as protection scope of the present invention.

Claims (1)

1. underground coal mine ultrasonic wave and the compound fracturing coal body analogue experiment method of hydraulic fracturing, which is characterized in that the experiment side For method using underground coal mine ultrasonic wave and the compound fracturing coal body simulator of hydraulic fracturing, which includes closing three axis pressurization dress It puts, the compound fracturing device of ultrasonic wave hydraulic fracturing (4), pumping gas injection device (5) and monitoring device (3);The ultrasonic wave The compound fracturing device of hydraulic fracturing (4) includes ultrasonic wave fracturing equipment (4-1) and hydraulic fracturing equipment (4-2), the pumping note Device of air (5) includes vacuum pump (5-2) and the gas gas injection bottle (5-1) with pressure gauge;It is put in the three axis pressue device It is equipped with coal sample (10), the compound fracturing device of ultrasonic wave hydraulic fracturing (4) is by H-shaped steel pipe (18) by ultrasonic wave fracturing equipment (4-1) and hydraulic fracturing equipment (4-2) are connected respectively with the coal sample (10) in three axis pressue devices of closing;The pumping gas injection dress The vacuum pump (5-2) in (5) and the gas gas injection bottle (5-1) with pressure gauge are put respectively with closing in three axis pressue devices Coal sample (10) connects;The monitoring device (3) is connected with the coal sample (10) in three axis pressue devices of closing;
It is described closing three axis pressue devices include seal groove (1) and sealing cover (2), the seal groove (1) use thickness for The steel plate of 17cm is welded;The seal groove (1) and sealing cover (2) connect and compose inner space by eight bolts (16) and are The square of length of side 45cm;The one side of the seal groove (1) is bored there are three through hole, respectively upper hole (9-1), mesoporous (9-2) and Lower opening (9-3);Three through hole centers are respectively from top to bottom 26cm, 16cm and 6cm with the distance of seal groove (1) bottom, aperture From top to bottom be respectively 1cm, 3cm and 1cm, monitoring device (3), the compound fracturing device of ultrasonic wave hydraulic fracturing (4) and take out Gas gas injection device (5) is attached across three through holes respectively from top to bottom;
Two orthogonal sides of the seal groove (1) are respectively equipped with a thrust rod through-hole, and the sealing cover (2) is equipped with One thrust rod through-hole is respectively arranged with distance rod (6), seal groove (1) internal corresponding three in three thrust rod through-holes One end vertical connection thrust plate (11) of a distance rod (6), the thrust plate (11) for long 30cm, width 30cm, thickness 3cm it is rectangular Body bloom, the thrust plate (11) are close to squeezing action with coal sample (10);The distance rod (6) and seal groove (1) and sealing cover (2) sealed between by rubber ring (8-1), the rubber ring (8-1) is embedded in seal groove (1) and sealing cover (2) steel wall is advance In the slot milled out;
Experimental method comprises the following steps:
S1:According to the difference of the measuring apparatus needed for experiment, in the one side cutting for the square coal sample (10) that the length of side is 30cm, carve Using cutting face center as the center of circle after the completion of slot, construct an a diameter of 3cm, and depth is the drilling (21) of 15cm;
S2:The probe and electric wire of monitoring device (3) needed for testing are embedded in the slot carved in advance, are by length 15cm, outer diameter are in H-shaped steel pipe (18) the insertion drilling (21) of 3cm, and insertion depth 5cm, H-shaped steel pipe (18) is between coal wall It is sealed, the ultrasonic transducer (20) for connecting live wire is sent into drilling (21), ultrasonic transducer with anchoring adhesive (17) (20) it is connected between H-shaped steel pipe (18) inner wall by hollow out steel loop (19), keeps ultrasonic transducer (20) and H-shaped steel pipe (18) there are gaps between;
S3:The coal sample (10) for connecting monitoring device (3) is placed in seal groove (1), H-shaped steel pipe (18) and seal groove (1) mesoporous (9-2) alignment insertion, until coal sample (10) wall surface is bonded with seal groove (1) internal face, needed for experiment measurement The electric wire of monitoring device (3) is pierced by by the upper hole (9-1) on seal groove, close by anchoring adhesive between electric wire and hole wall Envelope;
S4:Sealing cover (2) and seal groove (1) are linked together using bolt (16), push 3 distance rods (6) to coal sample (10), three axis pressue devices of closing are placed on triaxial pressure machine after finishing, 3 of 3 distance rods (6) and triaxial pressure machine Press rods correspond to, and realize the pressurization of three axis of coal sample;
S5:Using vacuum pump (5-2) by lower opening (9-3) to closing three axis pressue devices in vacuumize 12 it is small when, according to experiment Different difference is filled with into three axis pressue devices of closing by lower opening (9-3) using the gas gas injection bottles (5-1) with pressure gauge The gas of volume fills gas and closes air valve (12) after finishing, adjusts triaxial pressure machine and coal sample is caused to reach three axis needed for experiment Stress;
S6:According to the difference of experiment, select suitable mode using ultrasonic wave fracturing equipment and hydraulic fracturing equipment (4) to coal sample Compound fracturing is carried out, and passes through monitoring device (3) and gathers experimental data in real time.
CN201610294713.2A 2016-05-05 2016-05-05 Underground coal mine ultrasonic wave and the compound fracturing coal body analogue experiment method of hydraulic fracturing CN105863596B (en)

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CN109323974A (en) * 2018-12-18 2019-02-12 重庆大学 A kind of experimental method of the controllable shock wave fracturing coal seam with gas of multi- scenarios method
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