CN103940962B - Underground coal mine waterfrac treatment experiments experiment room simulation system and method - Google Patents
Underground coal mine waterfrac treatment experiments experiment room simulation system and method Download PDFInfo
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- CN103940962B CN103940962B CN201410150621.8A CN201410150621A CN103940962B CN 103940962 B CN103940962 B CN 103940962B CN 201410150621 A CN201410150621 A CN 201410150621A CN 103940962 B CN103940962 B CN 103940962B
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Abstract
The invention discloses a kind of underground coal mine waterfrac treatment experiments experiment room simulation system and method, its system comprises electronic universal tester, waterfrac treatment condition simulation device, gas pressure systems, confined pressure hydraulic system, waterfrac treatment system and computing machine, waterfrac treatment condition simulation device helps simulation mechanism and lane to help surrounding environment simulation mechanism to form by lane, side simulation mechanism in lane comprises baffle plate, air permeable plate, coal petrography sample and top cutting ferrule pipe, side surrounding environment simulation mechanism in lane comprises base, cylinder barrel, cover, push-down head, first concave surface pressure head, first convex surface pressure head and piston, its method comprises step: one, assembling coal mine downhole hydraulic fracturing experiments laboratory analog system, two, coal supply rock sample loads axial compression, three, coal supply rock sample loads confined pressure, and four, coal supply rock sample loads gaseous tension, five, the coal petrography sample place of exposing in the cutting ferrule pipe of top carries out hydraulic fracturing experiments.The present invention can according to different mine shaft geology situation, and real simulation downhole hydraulic pressure break condition is stable and reliable for performance.
Description
Technical field
The invention belongs to underground coal mine waterfrac treatment technical field, be specifically related to a kind of underground coal mine waterfrac treatment experiments experiment room simulation system and method.
Background technology
After studying waterfrac treatment carried out to underground coal rock mass, the pressure of gas pumping and the situation of change of content, Chinese scholars has done many work place study, and summary is got up, and field hydraulic pressure break is divided into two kinds: one is aboveground hydraulic fracturing anti-reflection; Another kind is that downhole hydraulic pressure break improves gas pumping rate.Because the gas environment of the place at scene, existing machinery, down-hole and many experimental apparatuss limit the restriction into factors such as wells, work place study fails fully to study each factor affecting waterfrac treatment effect, therefore laboratory simulation hydraulic fracturing experiments is developed.But, mostly current laboratory simulation hydraulic fracturing experiments is the modeling effort axially pressure direction aboveground hydraulic fracturing anti-reflection of drilling, achieve the higher conclusion of many value and rule, and the factors such as simulation are difficult to because of down-hole pressure condition, relative with technique study simple and less to the downhole hydraulic fracturing experiments laboratory analog system along the punching of lane side.Nowadays, downhole hydraulic pressure break has become the important means improving gas pumping rate, and research axial compression, confined pressure, gaseous tension, bore direction angle, dip angle of hole, bit diameter, drillable length, the downhole hydraulic pressure break factor of boring, Hydraulic fracturing pressure and waterfrac treatment time etc. of whether cleaning have vital role to raising gas pumping rate.
Summary of the invention
Technical matters to be solved by this invention is for above-mentioned deficiency of the prior art, provide a kind of structure simple, realize convenient and use simple to operate, stable and reliable for performance, practical underground coal mine waterfrac treatment experiments experiment room simulation system.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of underground coal mine waterfrac treatment experiments experiment room simulation system, it is characterized in that: comprise electronic universal tester, waterfrac treatment condition simulation device, gas pressure systems, confined pressure hydraulic system, waterfrac treatment system and computing machine, described waterfrac treatment condition simulation device centering is placed on the base of electronic universal tester, and described electronic universal tester connects with computing machine;
Described waterfrac treatment condition simulation device helps simulation mechanism and lane to help surrounding environment simulation mechanism to form by lane, described lane side simulation mechanism comprises the baffle plate docked successively, air permeable plate, coal petrography sample and top cutting ferrule pipe, the outer wall of described top cutting ferrule pipe is provided with scale, described baffle plate, air permeable plate, it is an entirety that coal petrography sample and top cutting ferrule pipe are fastened by electrical adhesive tape, the first inlet channel is provided with in the middle part of described baffle plate, the second inlet channel be connected with the first inlet channel is provided with in the middle part of described air permeable plate, the surrounding described air permeable plate being positioned at the second inlet channel is provided with radial ventilative duct, described lane side surrounding environment simulation mechanism comprises base, be fixedly connected on the cylinder barrel of base top and be fixedly connected on the cover at cylinder barrel top, in the middle part of described cylinder barrel, sidewall has the lane side simulation mechanism patchhole inserted for lane side simulation mechanism, described base top middle position is provided with groove, push-down head is placed with in described groove, first concave surface pressure head is disposed with from top to bottom directly over described push-down head, first convex surface pressure head and piston, it is outside that described piston upwards passes cover, and the middle position of cover is provided with the through hole passed for piston, the upper surface of described piston is positioned at immediately below the pressure head of electronic universal tester, it is inner that described lane side simulation mechanism inserts cylinder barrel from described lane side simulation mechanism patchhole, and coal petrography sample is to being sitting between the upper surface of push-down head and the lower surface of first concave surface pressure head, top cutting ferrule pipe clamp closes and is connected in described lane side simulation mechanism patchhole, the gas access described base being provided with the 3rd inlet channel and being connected with the 3rd inlet channel, described push-down head is provided with the 4th inlet channel be connected with the 3rd inlet channel, described 4th inlet channel is connected with the first inlet channel by the first gas transport pipeline, described base is provided with the confined pressure liquid flow channel be connected with cylinder barrel inner space, described base sidepiece is provided with the confined pressure liquid entrance be connected with confined pressure liquid flow channel, and described cylinder barrel side is provided with exhausr port, described exhausr port is connected with exhausr port plug,
Described gas pressure systems comprises compression gas tank, and the gas outlet of described compression gas tank is connected with gas access by the second gas transport pipeline, and described second gas transport pipeline is provided with reduction valve and rain glass;
Described confined pressure hydraulic system comprises the confined pressure liquid inflow pipe that confined pressure liquid case is connected with confined pressure liquid case with one end, the other end of described confined pressure liquid inflow pipe is connected with confined pressure liquid entrance, described confined pressure liquid inflow pipe is connected with hydraulic pump and retaining valve, one section of confined pressure liquid inflow pipe between hydraulic pump and retaining valve is connected with confined pressure liquid run-down pipe, described confined pressure liquid run-down pipe is connected with confined pressure hydraulic coupling table and confined pressure liquid surplus valve, one section of confined pressure liquid inflow pipe between retaining valve and confined pressure liquid entrance is connected with confined pressure liquid recirculatory pipe, described confined pressure liquid recirculatory pipe is connected with confined pressure liquid reverse flow valve,
Described waterfrac treatment system comprises water tank, and described water tank, by hydraulic pipeline and the fastener for connection inserted when carrying out hydraulic fracturing experiments to coal petrography sample in the boring be arranged on coal petrography sample, described hydraulic pipeline is provided with water pump, water valve and water pressure gauge.
Above-mentioned underground coal mine waterfrac treatment experiments experiment room simulation system, is characterized in that: between described base and push-down head, between base and cylinder barrel, between cylinder barrel and cover, between first concave surface pressure head and first convex surface pressure head, push up between cutting ferrule pipe and cylinder barrel and between cover and piston and be provided with O-ring seal.
Above-mentioned underground coal mine waterfrac treatment experiments experiment room simulation system, it is characterized in that: described cylinder barrel is fixedly connected on base top by the first bolt, described cover is fixedly connected on cylinder barrel top by the second bolt.
Above-mentioned underground coal mine waterfrac treatment experiments experiment room simulation system, it is characterized in that: the shape of described cylinder barrel outline, the shape of push-down head outline, the shape of coal petrography sample outline, the shape of top cutting ferrule pipe outline and the shape of first concave surface pressure head bottom outline are cuboid, the length of described coal petrography sample is equal with the length of the length of push-down head and first concave surface pressure head bottom, the described width of coal petrography sample and the width of push-down head, the width of top cutting ferrule pipe outline is equal with the width of first concave surface pressure head bottom, the height of described coal petrography sample is equal with the height of top cutting ferrule pipe outline.
Above-mentioned underground coal mine waterfrac treatment experiments experiment room simulation system, it is characterized in that: one end of described first gas transport pipeline is connected with the first inlet channel by the first rapid-acting coupling, the other end of described first gas transport pipeline is connected with the 4th inlet channel by the second rapid-acting coupling.
Present invention also offers the underground coal mine waterfrac treatment experiments experiment room analogy method that a kind of method step is simple, realize conveniently can simulating truly gas self content and pressure in stress situation suffered by underground coal mine coal and rock and underground coal mine coal and rock, it is characterized in that the method comprises the following steps:
Step one, assembling coal mine downhole hydraulic fracturing experiments laboratory analog system, its detailed process is:
Step 101, the baffle plate docked successively, air permeable plate, coal petrography sample and top cutting ferrule pipe to be fastened by electrical adhesive tape be one overall, is combined into lane side simulation mechanism;
Step 102, push-down head to be placed in described groove, and the 4th inlet channel is connected with the 3rd inlet channel, and one end of the first gas transport pipeline is connected on the 4th inlet channel;
Step 103, cylinder barrel is fixedly connected on base top;
Step 104, the one end described lane side simulation mechanism with baffle plate are inserted in described lane side simulation mechanism patchhole, and by observing the scale be arranged on the card sleeve outer wall of top, are made coal petrography sample to being sitting on the upper surface of push-down head;
Step 105, the other end of the first gas transport pipeline is connected on the first inlet channel;
Step 106, first concave surface pressure head aligned be positioned over coal petrography sample upper surface on, and place first convex surface pressure head at the top of first concave surface pressure head;
Step 107, by piston through being arranged in the through hole of cover middle position, and cover is fixedly connected on cylinder barrel top, ensures the center of piston and the central alignment of first convex surface pressure head simultaneously;
Step 108, the second gas transport pipeline is connected on gas access;
Step 109, confined pressure liquid inflow pipe is connected on confined pressure liquid entrance;
Step 1010, electronic universal tester to be connected with computing machine, and the waterfrac treatment condition simulation device centering of step 101 ~ step 107 having been assembled is placed on the base of electronic universal tester, and the upper surface of piston is made to be positioned at immediately below the pressure head of described electronic universal tester;
Step 2, coal supply rock sample load axial compression: on computers, open mounted electronic universal tester software in advance, operation electronic universal tester software startup electronic universal tester, and the pressure head setting electronic universal tester presses down speed parameter and the pressure parameter of piston, the pressure head of electronic universal tester presses down piston, until the pressure parameter be presented in electronic universal tester software reaches the pressure parameter of setting according to the speed parameter of setting;
Step 3, coal supply rock sample load confined pressure: take off the exhausr port plug be connected on exhausr port, open exhausr port, open the feed liquor switch of confined pressure liquid surplus valve, open described confined pressure hydraulic system, confined pressure liquid in confined pressure liquid case warp after the second hydraulic pump pressurization flows in cylinder barrel by confined pressure liquid inflow pipe and confined pressure liquid entrance, when exhausr port has confined pressure liquid to flow out, exhausr port plug is connected on exhausr port, closes exhausr port;
Step 4, coal supply rock sample load gaseous tension: the switch opening reduction valve, open described gas pressure systems, through being entered in the first inlet channel and the second inlet channel by the gentle body entrance of the second gas transport pipeline after gas in compression gas tank is reduced pressure by reduction valve, and enter in bleeder vent road;
Step 5, the coal petrography sample place of exposing in the cutting ferrule pipe of top carry out hydraulic fracturing experiments, and its detailed process is as follows:
Step 501, be the coal petrography sample that exposes in the cutting ferrule pipe of top of the electrical drilling machine of d is got position angle is α, inclination angle is β, length is the boring of L with bit diameter;
Step 502, in described boring, insert steel pipe;
Step 503, carry out sealing of hole with encapsulant to described boring, sealed borehole length is n; Wherein, n<L;
Step 504, hydraulic pipeline is connected on steel pipe;
Step 505, open water valve, open described waterfrac treatment system, through being entered in steel pipe by hydraulic pipeline after the water in water tank is pressurizeed by water pump, and getting on coal petrography sample, waterfrac treatment being carried out to coal petrography sample, coal petrography sample defines the crack of inner filling water;
After step 506, pressure break time period t, close water valve, close described waterfrac treatment system, disconnected by the hydraulic pipeline be connected on steel pipe, the water in described crack flows out gradually;
Step 507, after the water in described crack drains, measure steel pipe with gas pressure measurement instrument and expose the gaseous tension P of port, and measure with gas concentration measurement instrument the gas concentration φ that steel pipe exposes port;
Step 508, the pressure head recording the electronic universal tester set in described step 2 press down the pressure parameter of piston, confined pressure in the step 3 that record confined pressure hydraulic coupling table shows, gaseous tension in the step 4 that record rain glass shows, the position angle of the diameter d and boring that record drill bit in described step 501 is α, inclination angle is β and length L, Hydraulic fracturing pressure in the step 505 that record water pressure gauge shows, record the pressure break time period t in described step 506, and record in described step 507 the gaseous tension P and gas concentration φ that measure and obtain.
Above-mentioned method, is characterized in that: also adopt boring cleaning fluid to clean described boring before described step 502.
Above-mentioned method, is characterized in that: in described step 102 before being placed on by push-down head in described groove, first in groove, puts into O-ring seal; In described step 103 before cylinder barrel is fixedly connected on base top, first put into O-ring seal in base top; In described step 104 before the one end described lane side simulation mechanism with baffle plate is inserted in described lane side simulation mechanism patchhole, first in described lane side simulation mechanism patchhole, put into O-ring seal; In described step 106 before first convex surface pressure head is placed on the top of first concave surface pressure head, first in first concave surface pressure head, put into O-ring seal; In described step 107 by piston through the through hole being arranged on cover middle position in before, first in the through hole being arranged on cover middle position, put into O-ring seal; In described step 107 before cover is fixedly connected on cylinder barrel top, first put into O-ring seal at cylinder barrel top.
Above-mentioned method, is characterized in that: in described step 103, cylinder barrel being fixedly connected on base top is employing second bolt; In described step 107, cover being fixedly connected on cylinder barrel top is employing the 3rd bolt.
Above-mentioned method, it is characterized in that: the speed parameter that the pressure head of the electronic universal tester set in described step 2 presses down piston is 0.4mm/min ~ 0.6mm/min, the pressure parameter that the pressure head of the electronic universal tester set in described step 2 presses down piston is 3MPa ~ 5MPa.
The present invention compared with prior art has the following advantages:
1, the structure of underground coal mine waterfrac treatment experiments experiment room of the present invention simulation system is simple, and it is convenient to realize, and uses simple to operate.
2, the method step of underground coal mine waterfrac treatment experiments experiment room of the present invention analogy method is simple, and it is convenient to realize.
3, the present invention can realize the adjustment to axial compression and confined pressure, according to the terrestrial stress size of different mine coal rock mass, can simulate terrestrial stress situation suffered by underground coal mine coal and rock truly.
4, the present invention can realize the adjustment of gaseous tension size, can according to the gas reserves of different mine and pressure, and real simulation goes out gas self content and pressure in underground coal mine coal and rock.
5, the present invention can measure raw coal (rock sample namely directly taked from mine) anti-reflection situation of its gas after downhole hydraulic pressure break.
6, the present invention can provide data for engineering technical personnel, axial compression (namely the pressure head of electronic universal tester presses down the pressure parameter of piston), the diameter d of confined pressure, gaseous tension, drill bit, the azimuth angle alpha of boring, the angle of inclination beta of boring, the length L of boring, Hydraulic fracturing pressure and pressure break time period t is studied to the affecting laws of effluent air pressure P and gas concentration φ after the waterfrac treatment of coal petrography sample for engineering technical personnel, and then the method for the effluent air concentration φ that is improved, and final raising gas pumping rate.
7, of the present invention to realize cost low, stable and reliable for performance, practical, is convenient to promote the use of.
In sum, the present invention realizes conveniently, can according to different mine shaft geology situation, waterfrac treatment condition under simulation well truly, the parameters such as axial compression, confined pressure, gaseous tension can be measured on the impact of downhole hydraulic pressure break antireflective effect and rule, stable and reliable for performance, contribute to improving gas pumping rate, be convenient to promote the use of.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the structural representation of waterfrac treatment condition simulation device of the present invention.
Description of reference numerals:
1-baffle plate; 2-air permeable plate; 3-coal petrography sample;
4-top cutting ferrule pipe; 5-the first inlet channel; 6-the second inlet channel;
7-ventilative duct; 8-base; 9-cylinder barrel;
10-cover; 11-push-down head; 12-first convex surface pressure head;
13-piston; 14-the three inlet channel; 15-gas access;
16-the four inlet channel; 17-the first gas transport pipeline;
18-confined pressure liquid flow channel; 19-confined pressure liquid entrance; 20-exhausr port;
21-exhausr port plug; 22-compression gas tank; 23-the second gas transport pipeline;
24-reduction valve; 25-rain glass; 26-confined pressure liquid case;
27-confined pressure liquid inflow pipe; 28-hydraulic pump; 29-confined pressure liquid run-down pipe;
30-confined pressure hydraulic coupling table; 31-confined pressure liquid surplus valve; 32-confined pressure liquid recirculatory pipe;
33-confined pressure liquid reverse flow valve; 34-water tank; 35-hydraulic pipeline;
36-water pump; 37-water valve; 38-water pressure gauge;
39-first concave surface pressure head; 40-electronic universal tester;
41-waterfrac treatment condition simulation device; 42-computing machine;
43-retaining valve; 44-O-ring seal; 45-the first bolt;
46-the second bolt; 47-steel pipe.
Embodiment
As depicted in figs. 1 and 2, underground coal mine waterfrac treatment experiments experiment room of the present invention simulation system, comprise electronic universal tester 40, waterfrac treatment condition simulation device 41, gas pressure systems, confined pressure hydraulic system, waterfrac treatment system and computing machine 42, described waterfrac treatment condition simulation device 41 centering is placed on the base of electronic universal tester 40, and described electronic universal tester 40 connects with computing machine 42;
Described waterfrac treatment condition simulation device 41 helps simulation mechanism and lane to help surrounding environment simulation mechanism to form by lane, described lane side simulation mechanism comprises the baffle plate 1 docked successively, air permeable plate 2, coal petrography sample 3 and top cutting ferrule pipe 4, the outer wall of described top cutting ferrule pipe 4 is provided with scale, described baffle plate 1, air permeable plate 2, it is an entirety that coal petrography sample 3 and top cutting ferrule pipe 4 are fastened by electrical adhesive tape, the first inlet channel 5 is provided with in the middle part of described baffle plate 1, the second inlet channel 6 be connected with the first inlet channel 5 is provided with in the middle part of described air permeable plate 2, the surrounding described air permeable plate 2 being positioned at the second inlet channel 6 is provided with radial ventilative duct 7, described lane side surrounding environment simulation mechanism comprises base 8, be fixedly connected on the cylinder barrel 9 at base 8 top and be fixedly connected on the cover 10 at cylinder barrel 9 top, in the middle part of described cylinder barrel 9, sidewall has the lane side simulation mechanism patchhole inserted for lane side simulation mechanism, described base 8 crown center position is provided with groove, push-down head 11 is placed with in described groove, first concave surface pressure head 39 is disposed with from top to bottom directly over described push-down head 11, first convex surface pressure head 12 and piston 13, it is outside that described piston 13 upwards passes cover 10, and the middle position of cover 10 is provided with the through hole passed for piston 13, the upper surface of described piston 13 is positioned at immediately below the pressure head of electronic universal tester 40, it is inner that described lane side simulation mechanism inserts cylinder barrel 9 from described lane side simulation mechanism patchhole, and coal petrography sample 3 is to being sitting between the upper surface of push-down head 11 and the lower surface of first concave surface pressure head 39, top cutting ferrule pipe 4 is connected together in described lane side simulation mechanism patchhole, the gas access 15 described base 8 being provided with the 3rd inlet channel 14 and being connected with the 3rd inlet channel 14, described push-down head 11 is provided with the 4th inlet channel 16 be connected with the 3rd inlet channel 14, described 4th inlet channel 16 is connected with the first inlet channel 5 by the first gas transport pipeline 17, described base 8 is provided with the confined pressure liquid flow channel 18 be connected with cylinder barrel 9 inner space, described base 8 sidepiece is provided with the confined pressure liquid entrance 19 be connected with confined pressure liquid flow channel 18, described cylinder barrel 9 side is provided with exhausr port 20, and described exhausr port 20 is connected with exhausr port plug 21,
Described gas pressure systems comprises compression gas tank 22, and the gas outlet of described compression gas tank 22 is connected with gas access 15 by the second gas transport pipeline 23, and described second gas transport pipeline 23 is provided with reduction valve 24 and rain glass 25;
Described confined pressure hydraulic system comprises the confined pressure liquid inflow pipe 27 that confined pressure liquid case 26 is connected with confined pressure liquid case 26 with one end, the other end of described confined pressure liquid inflow pipe 27 is connected with confined pressure liquid entrance 19, described confined pressure liquid inflow pipe 27 is connected with hydraulic pump 28 and retaining valve 43, one section of confined pressure liquid inflow pipe 27 between hydraulic pump 28 and retaining valve 43 is connected with confined pressure liquid run-down pipe 29, described confined pressure liquid run-down pipe 29 is connected with confined pressure hydraulic coupling table 30 and confined pressure liquid surplus valve 31, one section of confined pressure liquid inflow pipe 27 between retaining valve 43 and confined pressure liquid entrance 19 is connected with confined pressure liquid recirculatory pipe 32, described confined pressure liquid recirculatory pipe 32 is connected with confined pressure liquid reverse flow valve 33,
Described waterfrac treatment system comprises water tank 34, described water tank 34 is connected with the steel pipe 47 inserted in the boring be arranged on coal petrography sample 3 when carrying out hydraulic fracturing experiments to coal petrography sample 3 by hydraulic pipeline 35, described hydraulic pipeline 35 is provided with water pump 36, water valve 37 and water pressure gauge 38.
As shown in Figure 2, in the present embodiment, between described base 8 and push-down head 11, between base 8 and cylinder barrel 9, between cylinder barrel 9 and cover 10, between first concave surface pressure head 39 and first convex surface pressure head 12, push up between cutting ferrule pipe 4 and cylinder barrel 9 and between cover 10 and piston 13 and be provided with O-ring seal 44.Described cylinder barrel 9 is fixedly connected on base 8 top by the first bolt 45, and described cover 10 is fixedly connected on cylinder barrel 9 top by the second bolt 46.
As shown in Figure 2, in the present embodiment, the shape of described cylinder barrel 9 outline, the shape of push-down head 11 outline, the shape of coal petrography sample 3 outline, the shape of top cutting ferrule pipe 4 outline and the shape of first concave surface pressure head 39 bottom outline are cuboid, the length of described coal petrography sample 3 is equal with the length of the length of push-down head 11 and first concave surface pressure head 39 bottom, the width of described coal petrography sample 3 and the width of push-down head 11, the width of top cutting ferrule pipe 4 outline is equal with the width of first concave surface pressure head 39 bottom, the height of described coal petrography sample 3 is equal with the height of top cutting ferrule pipe 4 outline.
As shown in Figure 2, in the present embodiment, one end of described first gas transport pipeline 17 is connected with the first inlet channel 5 by the first rapid-acting coupling, and the other end of described first gas transport pipeline 17 is connected with the 4th inlet channel 16 by the second rapid-acting coupling.
Underground coal mine waterfrac treatment experiments experiment room of the present invention analogy method, comprises the following steps:
Step one, assembling coal mine downhole hydraulic fracturing experiments laboratory analog system, its detailed process is:
Step 101, the baffle plate 1 docked successively, air permeable plate 2, coal petrography sample 3 and top cutting ferrule pipe 4 to be fastened by electrical adhesive tape be one overall, is combined into lane side simulation mechanism;
Step 102, push-down head 11 to be placed in described groove, and the 4th inlet channel 16 is connected with the 3rd inlet channel 14, and one end of the first gas transport pipeline 17 is connected on the 4th inlet channel 16;
Step 103, cylinder barrel 9 is fixedly connected on base 8 top;
Step 104, the one end described lane side simulation mechanism with baffle plate 1 are inserted in described lane side simulation mechanism patchhole, and by observing the scale be arranged on cutting ferrule pipe 4 outer wall of top, are made coal petrography sample 3 to being sitting on the upper surface of push-down head 11; During concrete enforcement, the distance that known seat 8 center to cylinder barrel 9 has the side, side of lane side simulation mechanism patchhole is l
1, and the half of the length of known coal petrography sample 3 is l
2, by formula l=l
1-l
2just can calculate the distance l that side to cylinder barrel 9 that top cutting ferrule pipe 4 stretches into cylinder barrel 9 inside has the side, side of lane side simulation mechanism patchhole, and this distance l can be arranged on the scale pushed up on cutting ferrule pipe 4 outer wall and learn by observing;
Step 105, the other end of the first gas transport pipeline 17 is connected on the first inlet channel 5;
Step 106, first concave surface pressure head 39 aligned be positioned over coal petrography sample 3 upper surface on, and place first convex surface pressure head 12 at the top of first concave surface pressure head 39;
Step 107, by piston 13 through being arranged in the through hole of cover 10 middle position, and cover 10 is fixedly connected on cylinder barrel 9 top, ensures the center of piston 13 and the central alignment of first convex surface pressure head 12 simultaneously;
Step 108, the second gas transport pipeline 23 is connected on gas access 15;
Step 109, confined pressure liquid inflow pipe 27 is connected on confined pressure liquid entrance 19;
Step 1010, electronic universal tester 40 to be connected with computing machine 42, and waterfrac treatment condition simulation device 41 centering of step 101 ~ step 107 having been assembled is placed on the base of electronic universal tester 40, and the upper surface of piston 13 is made to be positioned at immediately below the pressure head of described electronic universal tester 40;
Step 2, coal supply rock sample 3 load axial compression: on computing machine 42, open mounted electronic universal tester software in advance, operation electronic universal tester software startup electronic universal tester 40, and the pressure head setting electronic universal tester 40 presses down speed parameter and the pressure parameter of piston 13, the pressure head of electronic universal tester 40 presses down piston 13, until the pressure parameter be presented in electronic universal tester software reaches the pressure parameter of setting according to the speed parameter of setting;
Step 3, coal supply rock sample 3 load confined pressure: take off the exhausr port plug 21 be connected on exhausr port 20, open exhausr port 20, open the feed liquor switch of confined pressure liquid surplus valve 31, open described confined pressure hydraulic system, confined pressure liquid in confined pressure liquid case 26 warp after the second hydraulic pump 37 pressurizes flows in cylinder barrel 9 by confined pressure liquid inflow pipe 27 and confined pressure liquid entrance 19, when exhausr port 20 has confined pressure liquid to flow out, exhausr port plug 21 is connected on exhausr port 20, closes exhausr port 20;
Pressed down the pressure parameter of piston 13 by the pressure head arranging different electronic universal testers 40 in step 2, the adjustment to axial compression can be realized; By operating confined pressure liquid surplus valve 31 in step 3, the adjustment to confined pressure can be realized; And then according to the terrestrial stress size of different mine coal rock mass, terrestrial stress situation suffered by underground coal mine coal and rock can be simulated truly.
Step 4, coal supply rock sample 3 load gaseous tension: the switch opening reduction valve 24, open described gas pressure systems, through being entered in the first inlet channel 5 and the second inlet channel 6 by the second gas transport pipeline 23 and gas access 15 after gas in compression gas tank 22 is reduced pressure by reduction valve 24, and enter in bleeder vent road 7;
By operating reduction valve 24 in step 4, the adjustment to gaseous tension size can be realized, can according to the gas reserves of different mine and pressure, real simulation goes out gas self content and pressure in underground coal mine coal and rock.
Step 5, coal petrography sample 3 place of exposing in top cutting ferrule pipe 4 carry out hydraulic fracturing experiments, and its detailed process is as follows:
Step 501, be the coal petrography sample 3 that exposes in top cutting ferrule pipe 4 of the electrical drilling machine of d is got position angle is α, inclination angle is β, length is the boring of L with bit diameter;
Step 502, in described boring, insert steel pipe 47; During concrete enforcement, the length of steel pipe 47 is slightly less than the length L of boring, and the diameter of steel pipe 47 is slightly less than the diameter of boring, i.e. the diameter d of drill bit;
Step 503, carry out sealing of hole with encapsulant to described boring, sealed borehole length is n; Wherein, n<L; During concrete enforcement, described encapsulant is epoxide-resin glue;
Step 504, hydraulic pipeline 35 is connected on steel pipe 47;
Step 505, open water valve 37, opening described waterfrac treatment system, through being entered in steel pipe 47 by hydraulic pipeline 35 after the water in water tank 34 is pressurizeed by water pump 36, and getting on coal petrography sample 3, waterfrac treatment is carried out to coal petrography sample 3, coal petrography sample 3 defines the crack of inner filling water;
After step 506, pressure break time period t, close water valve 37, close described waterfrac treatment system, disconnected by the hydraulic pipeline 35 be connected on steel pipe 47, the water in described crack flows out gradually;
Step 507, after the water in described crack drains, measure steel pipe 47 with gas pressure measurement instrument and expose the gaseous tension P of port, and measure with gas concentration measurement instrument the gas concentration φ that steel pipe 47 exposes port;
Step 508, the pressure head recording the electronic universal tester 40 set in described step 2 presses down the pressure parameter of piston 13, confined pressure in the step 3 of display on record confined pressure hydraulic coupling table 30, gaseous tension in the step 4 of display on record rain glass 25, the position angle of the diameter d and boring that record drill bit in described step 501 is α, inclination angle is β and length L, Hydraulic fracturing pressure in the step 505 of display on record water pressure gauge 38, record the pressure break time period t in described step 506, and record in described step 507 the gaseous tension P and gas concentration φ that measure and obtain.Engineering technical personnel are supplied to by recording the data obtained above, engineering technical personnel can study axial compression (namely the pressure head of electronic universal tester 40 presses down the pressure parameter of piston 13), the diameter d of confined pressure, gaseous tension, drill bit, the azimuth angle alpha of boring, the angle of inclination beta of boring, the length L of boring, Hydraulic fracturing pressure and pressure break time period t to effluent air pressure P and gas concentration φ after coal petrography sample 3 waterfrac treatment, and then the method for the effluent air concentration φ that is improved, and final raising gas pumping rate.
In the present embodiment, boring cleaning fluid before described step 502, is also adopted to clean described boring.During concrete enforcement, described boring cleaning fluid is acetone or alcohol.By cleaning described boring, can also examine whether to clean the impact of boring on effluent air pressure P and gas concentration φ after coal petrography sample 3 waterfrac treatment for engineering technical personnel.
In the present embodiment, in described step 102 before being placed in described groove by push-down head 11, first in groove, put into O-ring seal 44; In described step 103 before cylinder barrel 9 is fixedly connected on base 8 top, first put into O-ring seal 44 at base 8 top; In described step 104 before the one end described lane side simulation mechanism with baffle plate 1 is inserted in described lane side simulation mechanism patchhole, first in described lane side simulation mechanism patchhole, put into O-ring seal 44; In described step 106 before first convex surface pressure head 12 is placed on the top of first concave surface pressure head 39, first in first concave surface pressure head 39, put into O-ring seal 44; In described step 107 by piston 13 through the through hole being arranged on cover 10 middle position in before, first in the through hole being arranged on cover 10 middle position, put into O-ring seal 44; In described step 107 before cover 10 is fixedly connected on cylinder barrel 9 top, first put into O-ring seal 44 at cylinder barrel 9 top.In described step 103, cylinder barrel 9 being fixedly connected on base 8 top is employing second bolt 45; In described step 107, cover 10 being fixedly connected on cylinder barrel 9 top is employing the 3rd bolt 46.
In the present embodiment, the speed parameter that the pressure head of the electronic universal tester 40 set in described step 2 presses down piston 13 is 0.4mm/min ~ 0.6mm/min, and the pressure parameter that the pressure head of the electronic universal tester 40 set in described step 2 presses down piston 13 is 3MPa ~ 5MPa.
The above; it is only preferred embodiment of the present invention; not the present invention is imposed any restrictions, every above embodiment is done according to the technology of the present invention essence any simple modification, change and equivalent structure change, all still belong in the protection domain of technical solution of the present invention.
Claims (10)
1. a underground coal mine waterfrac treatment experiments experiment room simulation system, it is characterized in that: comprise electronic universal tester (40), waterfrac treatment condition simulation device (41), gas pressure systems, confined pressure hydraulic system, waterfrac treatment system and computing machine (42), described waterfrac treatment condition simulation device (41) centering is placed on the base of electronic universal tester (40), and described electronic universal tester (40) connects with computing machine (42);
Described waterfrac treatment condition simulation device (41) helps simulation mechanism and lane to help surrounding environment simulation mechanism to form by lane, described lane side simulation mechanism comprises the baffle plate (1) docked successively, air permeable plate (2), coal petrography sample (3) and top cutting ferrule pipe (4), the outer wall of described top cutting ferrule pipe (4) is provided with scale, described baffle plate (1), air permeable plate (2), it is an entirety that coal petrography sample (3) and top cutting ferrule pipe (4) are fastened by electrical adhesive tape, described baffle plate (1) middle part is provided with the first inlet channel (5), described air permeable plate (2) middle part is provided with the second inlet channel (6) be connected with the first inlet channel (5), the surrounding described air permeable plate (2) being positioned at the second inlet channel (6) is provided with radial ventilative duct (7), described lane side surrounding environment simulation mechanism comprises base (8), be fixedly connected on the cylinder barrel (9) at base (8) top and be fixedly connected on the cover (10) at cylinder barrel (9) top, described cylinder barrel (9) middle part sidewall has the lane side simulation mechanism patchhole inserted for lane side simulation mechanism, described base (8) crown center position is provided with groove, push-down head (11) is placed with in described groove, first concave surface pressure head (39) is disposed with from top to bottom directly over described push-down head (11), first convex surface pressure head (12) and piston (13), it is outside that described piston (13) upwards passes cover (10), and the middle position of cover (10) is provided with the through hole passed for piston (13), the upper surface of described piston (13) is positioned at immediately below the pressure head of electronic universal tester (40), it is inner that described lane side simulation mechanism inserts cylinder barrel (9) from described lane side simulation mechanism patchhole, and coal petrography sample (3) is to being sitting between the upper surface of push-down head (11) and the lower surface of first concave surface pressure head (39), top cutting ferrule pipe (4) is connected together in described lane side simulation mechanism patchhole, the gas access (15) described base (8) being provided with the 3rd inlet channel (14) and being connected with the 3rd inlet channel (14), described push-down head (11) is provided with the 4th inlet channel (16) be connected with the 3rd inlet channel (14), described 4th inlet channel (16) is connected with the first inlet channel (5) by the first gas transport pipeline (17), described base (8) is provided with the confined pressure liquid flow channel (18) be connected with cylinder barrel (9) inner space, described base (8) sidepiece is provided with the confined pressure liquid entrance (19) be connected with confined pressure liquid flow channel (18), described cylinder barrel (9) side is provided with exhausr port (20), described exhausr port (20) is connected with exhausr port plug (21),
Described gas pressure systems comprises compression gas tank (22), the gas outlet of described compression gas tank (22) is connected with gas access (15) by the second gas transport pipeline (23), and described second gas transport pipeline (23) is provided with reduction valve (24) and rain glass (25);
Described confined pressure hydraulic system comprises the confined pressure liquid inflow pipe (27) that confined pressure liquid case (26) is connected with confined pressure liquid case (26) with one end, the other end of described confined pressure liquid inflow pipe (27) is connected with confined pressure liquid entrance (19), described confined pressure liquid inflow pipe (27) is connected with hydraulic pump (28) and retaining valve (43), be positioned on one section of confined pressure liquid inflow pipe (27) between hydraulic pump (28) and retaining valve (43) and be connected with confined pressure liquid run-down pipe (29), described confined pressure liquid run-down pipe (29) is connected with confined pressure hydraulic coupling table (30) and confined pressure liquid surplus valve (31), be positioned on one section of confined pressure liquid inflow pipe (27) between retaining valve (43) and confined pressure liquid entrance (19) and be connected with confined pressure liquid recirculatory pipe (32), described confined pressure liquid recirculatory pipe (32) is connected with confined pressure liquid reverse flow valve (33),
Described waterfrac treatment system comprises water tank (34), described water tank (34) is connected with the steel pipe (47) inserted when carrying out hydraulic fracturing experiments to coal petrography sample (3) in the boring that is arranged on coal petrography sample (3) by hydraulic pipeline (35), described hydraulic pipeline (35) is provided with water pump (36), water valve (37) and water pressure gauge (38).
2. according to underground coal mine waterfrac treatment experiments experiment room according to claim 1 simulation system, it is characterized in that: between described base (8) and push-down head (11), between base (8) and cylinder barrel (9), between cylinder barrel (9) and cover (10), between first concave surface pressure head (39) and first convex surface pressure head (12), push up between cutting ferrule pipe (4) and cylinder barrel (9) and between cover (10) and piston (13) and be provided with O-ring seal (44).
3. according to underground coal mine waterfrac treatment experiments experiment room according to claim 1 simulation system, it is characterized in that: described cylinder barrel (9) is fixedly connected on base (8) top by the first bolt (45), described cover (10) is fixedly connected on cylinder barrel (9) top by the second bolt (46).
4. according to underground coal mine waterfrac treatment experiments experiment room according to claim 1 simulation system, it is characterized in that: the shape of described cylinder barrel (9) outline, the shape of push-down head (11) outline, the shape of coal petrography sample (3) outline, the shape of top cutting ferrule pipe (4) outline and the shape of first concave surface pressure head (39) bottom outline are cuboid, the length of described coal petrography sample (3) is equal with the length of the length of push-down head (11) and first concave surface pressure head (39) bottom, the width of described coal petrography sample (3) and the width of push-down head (11), the width of top cutting ferrule pipe (4) outline is equal with the width of first concave surface pressure head (39) bottom, the height of described coal petrography sample (3) is equal with the height of top cutting ferrule pipe (4) outline.
5. according to underground coal mine waterfrac treatment experiments experiment room according to claim 1 simulation system, it is characterized in that: one end of described first gas transport pipeline (17) is connected with the first inlet channel (5) by the first rapid-acting coupling, the other end of described first gas transport pipeline (17) is connected with the 4th inlet channel (16) by the second rapid-acting coupling.
6. utilize simulation system as claimed in claim 1 to carry out a method for underground coal mine waterfrac treatment experiments experiment room simulation, it is characterized in that the method comprises the following steps:
Step one, assembling coal mine downhole hydraulic fracturing experiments laboratory analog system, its detailed process is:
Step 101, to be fastened by electrical adhesive tape in the baffle plate docked successively (1), air permeable plate (2), coal petrography sample (3) and top cutting ferrule pipe (4) be one overall, is combined into lane side simulation mechanism;
Step 102, push-down head (11) is placed in described groove, and the 4th inlet channel (16) is connected with the 3rd inlet channel (14), and one end of the first gas transport pipeline (17) is connected on the 4th inlet channel (16);
Step 103, cylinder barrel (9) is fixedly connected on base (8) top;
Step 104, the one end described lane side simulation mechanism with baffle plate (1) are inserted in described lane side simulation mechanism patchhole, and be arranged on the scale on cutting ferrule pipe (4) outer wall of top by observation, make coal petrography sample (3) to being sitting on the upper surface of push-down head (11);
Step 105, the other end of the first gas transport pipeline (17) is connected on the first inlet channel (5);
Step 106, first concave surface pressure head (39) aligned be positioned over coal petrography sample (3) upper surface on, and place first convex surface pressure head (12) at the top of first concave surface pressure head (39);
Step 107, by piston (13) through being arranged in the through hole of cover (10) middle position, and cover (10) is fixedly connected on cylinder barrel (9) top, ensure the center of piston (13) and the central alignment of first convex surface pressure head (12) simultaneously;
Step 108, the second gas transport pipeline (23) is connected on gas access (15);
Step 109, confined pressure liquid inflow pipe (27) is connected on confined pressure liquid entrance (19);
Step 1010, electronic universal tester (40) to be connected with computing machine (42), and waterfrac treatment condition simulation device (41) centering of step 101 ~ step 107 having been assembled is placed on the base of electronic universal tester (40), and the upper surface of piston (13) is made to be positioned at immediately below the pressure head of described electronic universal tester (40);
Step 2, coal supply rock sample (3) load axial compression: on computing machine (42), open mounted electronic universal tester software in advance, operation electronic universal tester software startup electronic universal tester (40), and the pressure head setting electronic universal tester (40) presses down speed parameter and the pressure parameter of piston (13), the pressure head of electronic universal tester (40) presses down piston (13), until the pressure parameter be presented in electronic universal tester software reaches the pressure parameter of setting according to the speed parameter of setting;
Step 3, coal supply rock sample (3) loads confined pressure: take off the exhausr port plug (21) be connected on exhausr port (20), open exhausr port (20), open the feed liquor switch of confined pressure liquid surplus valve (31), open described confined pressure hydraulic system, confined pressure liquid in confined pressure liquid case (26) warp after the second hydraulic pump (37) pressurization flows in cylinder barrel (9) by confined pressure liquid inflow pipe (27) and confined pressure liquid entrance (19), when exhausr port (20) has confined pressure liquid to flow out, exhausr port plug (21) is connected on exhausr port (20), close exhausr port (20),
Step 4, coal supply rock sample (3) load gaseous tension: the switch opening reduction valve (24), open described gas pressure systems, gas in compression gas tank (22) is entered in the first inlet channel (5) and the second inlet channel (6) by the second gas transport pipeline (23) and gas access (15) by warp after reduction valve (24) decompression, and enters in bleeder vent road (7);
Step 5, coal petrography sample (3) place of exposing in top cutting ferrule pipe (4) carry out hydraulic fracturing experiments, and its detailed process is as follows:
Step 501, be the coal petrography sample (3) that exposes in top cutting ferrule pipe (4) of the electrical drilling machine of d is got position angle is α, inclination angle is β, length is the boring of L with bit diameter;
Step 502, in described boring, insert steel pipe (47);
Step 503, carry out sealing of hole with encapsulant to described boring, sealed borehole length is n; Wherein, n<L;
Step 504, hydraulic pipeline (35) is connected on steel pipe (47);
Step 505, open water valve (37), open described waterfrac treatment system, water in water tank (34) enters in steel pipe (47) by warp after water pump (36) pressurization by hydraulic pipeline (35), and get on coal petrography sample (3), waterfrac treatment is carried out to coal petrography sample (3), coal petrography sample (3) defines the crack of inner filling water;
After step 506, pressure break time period t, close water valve (37), close described waterfrac treatment system, the hydraulic pipeline (35) that will be connected on steel pipe (47) disconnects, and the water in described crack flows out gradually;
Step 507, after the water in described crack drains, measure steel pipe (47) with gas pressure measurement instrument and expose the gaseous tension P of port, and measure with gas concentration measurement instrument the gas concentration φ that steel pipe (47) exposes port;
Step 508, the pressure head recording the electronic universal tester (40) set in described step 2 presses down the pressure parameter of piston (13), confined pressure in the step 3 of the upper display of record confined pressure hydraulic coupling table (30), gaseous tension in the step 4 of the upper display of record rain glass (25), the position angle of the diameter d and boring that record drill bit in described step 501 is α, inclination angle is β and length L, Hydraulic fracturing pressure in the step 505 of the upper display of record water pressure gauge (38), record the pressure break time period t in described step 506, and record in described step 507 the gaseous tension P and gas concentration φ that measure and obtain.
7. in accordance with the method for claim 6, it is characterized in that: before described step 502, also adopt boring cleaning fluid to clean described boring.
8. in accordance with the method for claim 6, it is characterized in that: in described step 102 before push-down head (11) is placed in described groove, first in groove, put into O-ring seal (44); In described step 103 before cylinder barrel (9) is fixedly connected on base (8) top, first put into O-ring seal (44) at base (8) top; In described step 104 before the one end described lane side simulation mechanism with baffle plate (1) is inserted in described lane side simulation mechanism patchhole, first in described lane side simulation mechanism patchhole, put into O-ring seal (44); In described step 106 before first convex surface pressure head (12) is placed on the top of first concave surface pressure head (39), first in first concave surface pressure head (39), put into O-ring seal (44); In described step 107 by piston (13) through the through hole being arranged on cover (10) middle position in before, first in the through hole being arranged on cover (10) middle position, put into O-ring seal (44); In described step 107 before cover (10) is fixedly connected on cylinder barrel (9) top, first put into O-ring seal (44) at cylinder barrel (9) top.
9. in accordance with the method for claim 6, it is characterized in that: cylinder barrel (9) being fixedly connected on base (8) top in described step 103 is employing second bolt (45); Cover (10) being fixedly connected on cylinder barrel (9) top in described step 107 is employing the 3rd bolt (46).
10. in accordance with the method for claim 6, it is characterized in that: the speed parameter that the pressure head of the electronic universal tester (40) set in described step 2 presses down piston (13) is 0.4mm/min ~ 0.6mm/min, the pressure parameter that the pressure head of the electronic universal tester set in described step 2 (40) presses down piston (13) is 3MPa ~ 5MPa.
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| CN104764666B (en) * | 2015-04-04 | 2017-12-29 | 西安科技大学 | Low-and high-frequency ballistics and the test integrated experimental bench of frequency synthesis |
| CN105114049A (en) * | 2015-09-17 | 2015-12-02 | 中国石油大学(北京) | Experimental device for simulating hydrofracture action mechanism in steam assisted gravity drainage (SAGD) process |
| CN105332683B (en) * | 2015-11-16 | 2017-07-21 | 中国石油大学(北京) | Fracturing experiments device and method |
| CN105628507B (en) * | 2016-02-05 | 2018-07-03 | 四川大学 | The device of realization hydraulic fracturing experiments and rock sample and method in conventional rock mechanics experiment machine |
| CN105804747B (en) * | 2016-03-14 | 2018-02-27 | 西安科技大学 | A kind of ultra-thin coal seam waterpower bores the mining method that pops |
| CN107748241B (en) * | 2017-10-25 | 2020-04-21 | 辽宁工程技术大学 | Comprehensive simulation test device for hydraulic fracturing and gas outburst |
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