CN201794583U - Well completion evaluation experiment device for coal bed methane cave - Google Patents
Well completion evaluation experiment device for coal bed methane cave Download PDFInfo
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- CN201794583U CN201794583U CN2010205077312U CN201020507731U CN201794583U CN 201794583 U CN201794583 U CN 201794583U CN 2010205077312 U CN2010205077312 U CN 2010205077312U CN 201020507731 U CN201020507731 U CN 201020507731U CN 201794583 U CN201794583 U CN 201794583U
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Abstract
The utility model discloses a well completion evaluation experiment device for a coal bed methane cave. The device comprises a square coal rock model arranged in a framework, the bottom surface of the coal rock model is provided with an upwards extended simulation shaft, the top surface of the coal rock model is provided with a plurality of downwards extended pressure testing holes, the outer side of the coal rock model is provided with a sealed rubber sleeve, pressing plates are fixedly arranged on the outer side of the rubber sleeve and six lateral surfaces of the corresponding coal rock model, through holes are formed on the upper and lower pressing plates and the rubber sleeve corresponding to the simulation shaft and the pressure testing holes, and a pressure testing pipe with a pressure sensor is arranged in each pressure testing hole; three servo pressurization oil cylinders are arranged in three directions of the space of the outer side of the coal rock model; and a communicating device is hermetically arranged on the lower pressing plate and conducted with the simulation shaft, the upper part of the communicating device is provided with an air inlet pipe, a water inlet pipe and a pressure testing pipe with a pressure sensor, the lower part of the communicating device is provided with an electric ball valve, the lower end of the electric ball valve is connected with a pressure release pipe, and the bottom of the pressure release pipe is correspondingly provided with a coal dust collecting trough.
Description
Technical field
The utility model is about a kind of completion experimental system for simulating, relates in particular to a kind of coal bed gas cave completion evaluation experimental facilities.
Background technology
Meridian oil company in 1986 begins to use bore hole cave completion technique at U.S.'s san juan basin, target coal seam is caved in form the cave to enlarge well, after the completion of cave the methane output of coal bed gas well be fracturing behind the perforation completion 3-20 doubly, and cost is lower than MHF, up to the present, san juan basin has more than 4000 mouthful of coal bed gas well, and wherein 1/3 is the cave completion, and cave completion cumulative gas accounts for 76% of whole basin gas production.
Compare with the coal bed gas cave completion of the U.S., owing to the reason that is subjected on equipment and the understanding, the coal bed gas cave completion of China does not also have really to realize the stress fluctuation of bottom pressure excitement or inside, coal seam, the micro-crack of cave far-end is not subjected to periodically opening property and shearing force function influence at all, so final effect is all undesirable.Therefore need and make aspect such as cave technology and further investigate in coal bed gas cave completion increasing yield, to form the coal bed gas cave completion theory and technology of China's independent intellectual property right.
The on-the-spot cave of coal bed gas well completion, be that coal bed gas well dynamically injects/discharges and makes cave technology, discharge capacity with the 43.5-56.6 cubic meters per minute, in 1-6 hour, the mixture of air or air and water is injected the coal bed gas well pit shaft, make well head pressure reach 10Mpa, throw open the ground hydraulic operated valve then, fast discharging pit shaft internal pressure, excitation well tube wall surface coal seam caves in to enlarge well, repeat to inject and build the pressure and discharge stress-relief process, produce one and stablize the cave in pit shaft, successfully the cave completion after has strengthened the exposed area in coal seam, increased the stratum flow conductivity, the injection of high-pressure fluid and stress-relief process, what produced opens the property crack and induces shear crack, the reservoir that can effectively be communicated with pit shaft and not injure, produce the self-supporting crack of a plurality of directions, do not have the crack of connection before having connected in the reservoir, thereby improved the permeability of wellbore reservoir greatly, reach the purpose of volume increase.
But, because it is huge to carry out the expense investment of coal bed gas cave completion field trial, length consuming time, the risk cost height, do not have fast, repeatedly, the ability of many stratum experiments, related experiment DATA REASONING and gather very difficulty, even and cave completion success, its increasing yield also is difficult to explain and analyze that therefore, China is considerably less to the increasing yield and the process research of coal bed gas cave completion.
The inventor proposes a kind of coal bed gas cave completion evaluation experimental facilities at the defective of prior art, effectively simulates cave completion process thus, thereby draws the increasing yield of cave completion.
The utility model content
The purpose of this utility model is to provide a kind of coal bed gas cave completion evaluation experimental facilities, in order to simulation cave completion process, thereby draws the increasing yield of cave completion.
The purpose of this utility model is to realize like this, a kind of coal bed gas cave completion evaluation experimental facilities, described evaluation experimental device by square coal petrography model and grasping system thereof, three servo loading systems, gas-liquid pressurization injected systems, collect metering systems and the monitoring treatment systems constitute; This square coal petrography model and grasping system thereof are arranged in the framework, this square coal petrography model and grasping system thereof comprise a square coal petrography model, this coal petrography model bottom surface is provided with a upwardly extending simulation wellbore hole, coal petrography model end face is provided with the pressure tap of a plurality of downward extensions, the coal petrography model outside is provided with seal rubber sleeve, on six sides of the gum cover outside and corresponding coal petrography model, be fixed with pressing plate, position corresponding with simulation wellbore hole and pressure tap on described upper and lower side guide and gum cover is respectively equipped with open-work, is provided with the piezometer tube of band pressure sensor in each pressure tap; Described three servo loading systems comprise three servo pressurization oil cylinders, and these three oil cylinders are arranged on three directions in space in the coal petrography model outside and to the coal petrography model and exert pressure; Gas-liquid pressurization injected system comprise that sealing is arranged on down on the side guide and with the linker of simulation wellbore hole conducting, this linker top is provided with the piezometer tube of air inlet pipe, water inlet pipe and band pressure sensor, the linker bottom is provided with an electrical ball valve, this electrical ball valve lower end is connected with a relief tube, and this relief tube bottom correspondence is provided with a coal powder collection tank.
In a better embodiment of the present utility model, described coal petrography model end face is provided with four pressure taps.
In a better embodiment of the present utility model, the importer of each oil cylinder that pressurizes is to installing a servo valve respectively, is used for the switch and the oil inlet quantity of accurate by-pass valve control.
In a better embodiment of the present utility model, described each servo pressurization oil cylinder is provided with power sensor and displacement transducer, and each servo pressurization oil cylinder is connected with the total digital controller of its action of control.
In a better embodiment of the present utility model, described air inlet pipe is connected with the air pressure pressurized cylinder with first hydraulic pressure by first passage, described water inlet pipe is connected with the air pressure pressurized cylinder with second hydraulic pressure by second channel, these two pressurized cylinder are by a driven by servomotor, this first hydraulic pressure and air pressure pressurized cylinder are communicated with gas bomb and fluid reservoir by first selector switch, and this second hydraulic pressure and air pressure pressurized cylinder are communicated with gas bomb and fluid reservoir by second selector switch; Described first passage is provided with first one way valve of unidirectional conducting air inlet pipe, and described second channel is provided with second one way valve of unidirectional conducting water inlet pipe.
In a better embodiment of the present utility model, described square coal petrography model is that cutting forms on raw coal; Square coal petrography model is of a size of 300mm * 300mm * 300mm; Described simulation wellbore hole diameter is 30mm, and the degree of depth is 200mm; The diameter of described each pressure tap is 6mm, and drilling depth is 160mm.
In a better embodiment of the present utility model, described simulation wellbore hole is positioned at the center of coal petrography model bottom surface and upwards vertical extent setting, described each pressure tap correspondence be arranged on simulation wellbore hole around.
In a better embodiment of the present utility model, described relief tube diameter is 30mm, 25mm, 20mm, 15mm, 10mm or 5mm.
Coal bed gas of the present utility model cave completion evaluation experimental facilities, can be under laboratory experiment simulated formation pressure the forming process in cave in the bulk coal petrography, thereby understand the mechanism of cave completion, by the cave measurement of the pore pressure at diverse location place on every side, before the analysis cave forms, in the speleogenesis and cave forms the back pore pressure response of coal petrography on every side, understand the growth and the disturbance in crack around the coal petrography in the completion process of cave, by the infiltrative mensuration of coal petrography around the cave, experiment back, cave, analyze the cave completion to the infiltrative improvement effect of coal petrography, thereby can be than the possible cause of more comprehensive evaluation cave completion volume increase, for well-completing process design in on-the-spot cave provides new way.Coal bed gas of the present utility model cave completion evaluation experimental facilities, have low cost, low-risk, simulation different reservoir environment, reusability, both can analyze the increasing yield of cave completion, can provide guidance for the on-the-spot technological design of coal bed gas cave completion again.
Description of drawings
The following drawings only is intended to the utility model done and schematically illustrates and explain, does not limit scope of the present utility model.Wherein,
Fig. 1: be the structural representation of the utility model coal bed gas cave completion evaluation experimental facilities.
Fig. 2: be a-a cross-sectional schematic among Fig. 1.
Fig. 3: be b-b cross-sectional schematic among Fig. 1.
Fig. 4: be the structural representation of square coal petrography model and grasping system thereof in the utility model.
Fig. 5: be the structural representation of gas-liquid pressurization injected system in the utility model and collection metering system.
Fig. 6 A: be the structural representation of gum cover in the utility model.
Fig. 6 B: the box structure schematic diagram that cuts out for gum cover bottom surface in Fig. 6 A.
Fig. 7: the structural representation that is connected with pressing plate for linker in the utility model.
The specific embodiment
Understand for technical characterictic of the present utility model, purpose and effect being had more clearly, now contrast the description of drawings specific embodiment of the present utility model.
As Fig. 1-shown in Figure 7, the utility model proposes a kind of coal bed gas cave completion evaluation experimental facilities 100, described evaluation experimental device 100 by square coal petrography model and grasping system thereof 1, three servo loading systems 2, gas-liquid pressurization injected systems 3, collect metering system 4 and monitoring treatment system 5 constitutes; This square coal petrography model and grasping system 1 thereof are arranged in the framework 6, this square coal petrography model and grasping system 1 thereof comprise a square coal petrography model 11, these coal petrography model 11 bottom surfaces are provided with a upwardly extending simulation wellbore hole 111, coal petrography model 11 end faces are provided with the pressure tap 112 of a plurality of downward extensions, coal petrography model 11 outsides are provided with seal rubber sleeve 12, on six sides of gum cover 12 outsides and corresponding coal petrography model 11, be fixed with pressing plate 13, on described, position corresponding with simulation wellbore hole 111 and pressure tap 112 on following side guide 13 and the gum cover 12 is respectively equipped with open-work, is provided with the piezometer tube 51 of band pressure sensor in each pressure tap 112; As Fig. 1, Fig. 2, shown in Figure 3, described three servo loading systems 2 comprise three servo pressurization oil cylinders 21,22 and 23, and these three oil cylinders are arranged on three directions in space in coal petrography model 11 outsides and to coal petrography model 11 and exert pressure; Gas-liquid pressurization injected system 3 comprise that sealing is arranged on down on the open-work of side guide 13 and with the linker 31 of simulation wellbore hole 111 conductings, as shown in Figure 7, these linker 31 tops are provided with the piezometer tube 52 of air inlet pipe 311, water inlet pipe 312 and band pressure sensor, linker 31 bottoms are provided with an electrical ball valve 41, these electrical ball valve 41 lower ends are connected with a relief tube 42, and these relief tube 42 bottom correspondences are provided with a coal powder collection tank 43.
Coal bed gas of the present utility model cave completion evaluation experimental facilities, can be under laboratory experiment simulated formation pressure the forming process in cave in the bulk coal petrography, thereby understand the mechanism of cave completion, by the cave measurement of the pore pressure at diverse location place on every side, before the analysis cave forms, in the speleogenesis and cave forms the back pressure-responsive of coal petrography on every side, understand the growth and the disturbance in crack around the coal petrography in the completion process of cave, by the infiltrative mensuration of coal petrography around the cave, experiment back, cave, analyze the cave completion to the infiltrative improvement effect of coal petrography, thereby can be than the possible cause of more comprehensive evaluation cave completion volume increase, for well-completing process design in on-the-spot cave provides new way.
In the present embodiment, described square coal petrography model 11 is that cutting forms on raw coal; Square coal petrography model 11 is of a size of 300mm * 300mm * 300mm; Described simulation wellbore hole 111 diameters are 30mm, and the degree of depth is 200mm; The diameter of described each pressure tap 112 is 6mm, and drilling depth is 160mm.Described simulation wellbore hole 111 is positioned at the center of coal petrography model 11 bottom surfaces and upwards vertical extent setting, described each pressure tap 112 correspondence be arranged on simulation wellbore hole 111 around (as shown in Figure 2).
In the present embodiment, described coal petrography model 11 end faces are provided with four pressure taps 112, piezometer tube 51 is inserted respectively in each pressure tap 112, the epoxide-resin glue sealing is injected in gap between piezometer tube 51 outside wall surface and the pressure tap 112, piezometer tube 51 adopts the stainless steel tube of diameter 3mm, the open-work of piezometer tube 51 about by diameter 10mm corresponding on the top board 13 passes outside the pressing plate 13, connect a pressure sensor on each piezometer tube 51, constitute four sensor pressure tap A, B, C, D, be used for gathering the pressure data of each pressure tap, the pressure sensor other end links to each other with data acquisition board on the computer.
In the present embodiment, because pressure tap 112 is not or not the center of square coal petrography model 11, when loading three axial compression stress, piezometer tube 51 necessarily has relative displacement with pressing plate 13, so its diameter of a plurality of open-works that is drilled with on the top board 13 is about 10mm, mainly be that pressing plate is outer to be connected with pressure sensor for the union of piezometer tube 51 is passed, during simultaneously for 11 distortion (relative displacement) of square coal petrography model, pressing plate 13 can not cut piezometer tube 51 yet.
Further, 21,22,23 pairs of square coal petrography models of described each servo pressurization oil cylinder, 11 servo loading three axial different compressive stress, servo pressurization oil cylinder 21 is level (X) pressurization oil cylinder, servo pressurization oil cylinder 22 is level (Y) pressurization oil cylinder, and these two pressurization oil cylinders 21,22 are mainly used to the compressive stress of servo loading horizontal direction; Servo pressurization oil cylinder 23 is vertical pressurization oil cylinder, is mainly used to load vertical compressive stress; The pressurization oil cylinder of three directions needs three digital EDC220 controllers come SERVO CONTROL, is used for compressed oil oil supply cylinder to three directions by a servo oil sources.The importer of each oil cylinder that pressurizes to, one servo valve all is installed, be used for the switch and the oil inlet quantity of accurate by-pass valve control, above three pressurization oil cylinders strong sensor and displacement transducer are installed all, the also continuous strong amplifier of power sensor, displacement transducer, displacement amplifier, be mainly used to the signal of displacement enlargement sensor and power sensor, make the power and the displacement data that obtain more accurate, thereby realize accurate control afterburning to the pressurization oil cylinder and stroke, thereby guarantee that coal petrography model 11 can be not crushed in the servo plus-pressure load process.In the present embodiment, come all digital EDC220 controllers of programme-control and collect data, output pattern, curve by a microcomputer.
In the present embodiment, described each pressing plate 13 outside also can be provided with an increased pressure board 14, and the face of exerting oneself of servo pressurization oil cylinder is pasting increased pressure board 14 (as Fig. 1, Fig. 2 and shown in Figure 3).
In the present embodiment, square coal petrography model and grasping system thereof are the cores of coal bed gas cave completion evaluation experimental facilities, this model structure both can realize the evaluation of cave completion, can realize the simulation test of fracturing again, and such design has realized the multi-functional of equipment; The sealing of model when described pressing plate 13 and gum cover 12 are mainly used to guarantee to load three axial anisotropy compressive stress.The experiment of normal triaxial pressure break, the general sealing problem that does not relate to sample inside, perhaps the sample internal pressurization is not generally considered the pressure problem that leaks outside, and coal bed gas cave completion evaluation experimental facilities is mainly used to simulate the mechanism process of gasser cave completion, the parameter of test cave completion, analyze the mechanism of cave completion, draw the compliance of cave completion, matching reservoir conditions and increasing yield, because test medium is a coal petrography, belong to the fracture development body, to in the coal petrography during simulation wellbore hole supercharging, in order to realize whole experiment purpose, must guarantee that the pit shaft internal pressure does not leak outside, six face upward pressures of coal and rock are the wall string not, therefore, the model integral sealing is designed to whole experimental system key of success place.
In the present embodiment, described gum cover 12 is that one cube of silica gel housing is (as Fig. 6 A, shown in Fig. 6 B), its undersized is in the size of square coal petrography model 11, when square coal petrography model 11 is put into described gum cover 12, earlier the hexahedron gum cover bottom surface of integral body is cut the square 121 of 260mm * 260mm, then square coal petrography model 11 is put into gum cover 12, afterwards the square 121 that cuts is attached to again bottom (remaking suitable seal), open the described open-work 122 of a diameter 40mm in the middle of the square 121 again, open-work 122 is used for making simulation wellbore hole 111 conductings in linker 31.Because the size of gum cover 12 is than square coal petrography model 11 smaller (being cube housing of length of side 295mm), gum cover 12 can be close on the coal petrography model 11, can guarantee that like this coal petrography model 11 and outside are isolated fully, six outer block pressur plates 13 of gum cover can be so that the very high pressure (more than the 20MPa) of gum cover 12 sealings, because 11 on pressing plate 13 and coal petrography model are by gum cover transmission pressure, so gum cover is compressed, on a face of coal petrography model 11, just can not produce flowing of pressure like this.
As shown in Figure 4, in the present embodiment, be respectively equipped with pressing plate fixed block 131 on described two adjacent pressing plates 13, when pressing plate 13 is installed, connect adjacent pressing plate fixed block 131, be used for folk prescription, make the pressing plate of installation be unlikely to scatter to fixation clip 13 by bolt.
In the present embodiment, linker 31 main effects are to connect air inlet pipeline and feed liquor pipeline, discharging simulation wellbore hole 111 gas inside or liquid, and the ickings that produces in the release cyclic process that builds the pressure; The pressure sensor that piezometer tube 52 on the linker connects constitutes the pressure tap E (as shown in Figure 7) to simulation wellbore hole 111 outlets.
As shown in Figure 5, described air inlet pipe 311 is connected with air pressure pressurized cylinder 331 with first hydraulic pressure by first passage 321, described water inlet pipe 312 is connected with air pressure pressurized cylinder 332 with second hydraulic pressure by second channel 322, these two pressurized cylinder 331 and 332 are driven by a servomotor 34, this first hydraulic pressure and air pressure pressurized cylinder 331 are communicated with gas bomb 36 and fluid reservoir 37 by first selector switch 351, and this second hydraulic pressure and air pressure pressurized cylinder 332 are communicated with gas bomb 36 and fluid reservoir 37 by second selector switch 352; Described first passage 321 is provided with first one way valve 381 of unidirectional conducting air inlet pipe, and described second channel 322 is provided with second one way valve 382 of unidirectional conducting water inlet pipe.
In the present embodiment, gas bomb 36 (for nitrogen cylinder) and fluid reservoir 37 are mainly the pressurization injected system source of the gas and liquid source are provided, be connected with 332 with air pressure pressurized cylinder 331 with hydraulic pressure, make hydraulic pressure and air pressure pressurized cylinder Compressed Gas or liquid supercharging by servomotor 34 and ball-screw 39, gas after the supercharging or liquid, by one way valve, enter air inlet pipe and/or water inlet pipe, be injected in the simulation wellbore hole 111 through linker 31 again.
In the present embodiment, electrical ball valve 41 back, linker bottom can connect the relief tube 42 of different-diameter, change release speed by the diameter that changes relief tube 42, thereby produce different making the cave effect and increase production arousal effect.In the present embodiment, described relief tube diameter can be 30mm, 25mm, 20mm, 15mm, 10mm or 5mm.Ickings that caves in out in the release cyclic process and fluid are collected by coal powder collection tank 43 after being derived by relief tube 42, are collected by coal powder collection box (not shown) more at last.Coal powder collection box bottom surface is the conical surface, and the centre preserves water, and conical surface upper end is placed with big coal particle and collects box, and the lower end is the dust collection box, puts the coal dust of all collections into the drying baker oven dry and weighs, and realizes accurate measurement.
Below experimentation of the present utility model is made description:
One, experiment purpose: draw by pressure testing and to annotate nitrogen supercharging, release circulation coal petrography sample produces the pressure in initial cave---thresholding pressure; Produce the process stablize cave and reach incentive action coal petrography.
Two, experiment primary condition: the coal petrography sample face cleat direction of installation is parallel to maximum horizontal principal stress direction (horizontal X pressurization oil cylinder compression aspect or horizontal Y pressurization oil cylinder compression aspect), coal petrography sample label is M1, the diameter 30mm of relief tube on the linker, the minimum level main stress bar loads 5MPa, maximum horizontal principal stress loads 7MPa, and vertical stress loads 11MPa; Perhaps maximum horizontal principal stress and minimum level main stress bar load 5MPa, and vertical stress loads 11MPa.
Three, experimental procedure:
(0) the coal petrography sample is installed in the model system,, loads the anisotropy compressive stress for the coal petrography model sample of experiment usefulness by three servo loading systems.
(1) whether the pressure of the pressure sensor on 5 pressure sensing point A of inspection, B, C, D, the E is 0, after determining all to be 0, begins experiment.
(2) carry out gas injection to build the pressure/release circulation before, open gas-liquid pressurization injected system was injected 0.3MPa in 2 seconds nitrogen (pressure that makes simulation wellbore hole is 0.3MPa).
When (3) gas injection begins, start 5 pressure sensors simultaneously, write down the pressure data of each pressure sensing point.
(4) when gas pressure reaches 0.3MPa in the simulation wellbore hole, close gas-liquid pressurization injected system, the pressure of observing 5 pressure sensing points changes, and checks the tightness of whole device.If E point (surveying the pressure in the simulation wellbore hole) pressure drops to certain value and tends towards stability then, illustrate that under low pressure tightness is normal.After a period of stabilisation, open the electrical ball valve on the linker, the beginning release is 0 o'clock all up to the pressure data of 5 pressure sensors, closes electrical ball valve, begins to carry out gas injection and builds the pressure/the release circulation experiment.
(5) open gas-liquid pressurization injected system, nitrogen injection fast makes the gas pressure in the simulation wellbore hole reach 4.5MPa in the time of 20-60 second.
When (6) gas injection begins, start 5 pressure sensors simultaneously, write down the pressure data of each pressure sensing point.
When (7) gas pressure reaches 4.5Mpa in the simulation wellbore hole, keep boost pressure constant, the pressure of observing 5 pressure sensors changes, and when the pressure of 5 pressure sensors all be 4.5MPa, perhaps 5 pressure sensor pressure was equal and during near 4.5Mpa.
(8) with diameter be the relief tube fast pressure relief of 30mm, the pressure change dynamics data of each pressure sensing point in the record stress-relief process.
(9) by the coal powder collection box, collect the ickings that ejects in the stress-relief process, comprise the ickings of being stained with sticking ickings in the release pipeline and being ejected into the tank the inside, the ickings of collecting is dried, weighed.(annotate: the density of coal is generally got 1434Kg/m
3), thereby estimate the volume that produces eye.Closing electrical ball valve, reinstalled the release pipeline, the coal powder collection tank is replaced by the equivalent clear water, is that a next gas injection/release circulation is prepared.
(10) if the ickings amount that ejects is considerably less, specifically be less than 30～50g, perhaps during release, do not occur a pressure curve that the range of decrease is bigger among pressure sensing point A, B, C, the D, then illustrate not produce the cave in the simulation wellbore hole or do not reach the primary condition that produces the cave.
(11) repeat above-mentioned steps (1)-(10) gas injection to build the pressure/release circulation 5 times, the primary condition of determining to produce the cave therewith pressure state cycle-index down it doesn't matter, and record pressure change dynamics data of each pressure sensing point at every turn.
(12) when deduction does not produce initial cave, the injection pressure of each nitrogen increases 0.5MPa, repeats above-mentioned steps (1)-(11), experience shows that different coal petrographys is under the identical stress condition, same diameter relief tube fast pressure relief has a thresholding pressure that produces initial cave.
(13) injection pressure reaches thresholding pressure in experimentation, will produce initial cave in the simulation wellbore hole during fast pressure relief, and criterion specifically greater than the 40-50 gram, perhaps occurs significantly drawdown curve for vomiting ickings among pressure sensing point A, B, C, the D.
(14) collect the ickings that ejects in the stress-relief process, comprise the ickings of being stained with sticking ickings in the release pipeline and being ejected into the tank the inside, the ickings of collecting is dried, weighed.Reinstalled the release pipeline, the coal powder collection tank has been changed quantitative clear water, for injecting gas boosting/release circulation is next time prepared.
(15) beginning is under the condition of thresholding pressure at maximum pressure, repeating step (1)-(10), carrying out another takes turns gas injection and builds the pressure/the release circulation, quick nitrogen injection, setting the nitrogen injection rate is that 20-60 is pressurized to thresholding pressure in second, keep this pressure then, treat that 5 pressure sensor pressure equal thresholding pressure or tend towards stability to approach thresholding pressure.
(16) the relief tube fast pressure relief that is 30mm with a diameter, the data of each pressure spot in the record stress-relief process, and the ickings weight that ejects.Clean release pipeline and coal powder collection tank.
(17) keep this condition constant, repeating step (15) and (16) up to the ickings amount that ejects seldom specifically are less than 20-50g, can regard as and form stable cave, generally circulate just can reach the condition of stablizing the cave 5-10 time.
(18) after the cave is stablized in formation, adopt the X ray CT scanner, scanning has formed the coal petrography sample M1 that stablizes the cave, observes the growth direction in cave and the growth direction in crack.
(19) behind the CT scan, M1 cuts open with the coal petrography sample, cuts perpendicular to the simulation wellbore hole horizontal direction, observes coal petrography sample interior cave and grows direction and concrete fracture development direction.
(20) get the minor diameter coal heart (diameter 25mm) from forming the coal petrography sample M1 that stablizes the cave, drill through the coal heart of adjacent position, cave of face cleat direction and adjacent coal sample wall, numbering M1-FX0 and M1-FX1 along face cleat direction and end hugger direction respectively; The coal heart of adjacent position, cave of end hugger direction and adjacent coal sample wall, numbering M1-BX0 and M1-BX1; The nearly cave of 0 representative, 1 represents near wall.
(21) the getting minor diameter coal heart is carried out permeability determination experiment, measure its permeability, and get coal heart permeability experimental data with raw coal scar hugger that does not carry out the cave experiment and end hugger direction and contrast.
From the above mentioned, the utility model utilization coal bed gas cave completion evaluation experimental facilities, can and make aspects such as cave technology and further investigate in coal bed gas cave completion increasing yield, to form the coal bed gas cave completion theory and technology of China's independent intellectual property right, the well-completing process investment of on-the-spot cave is huge, length consuming time, the risk cost height, do not have fast, repeatedly, the ability of many stratum experiment, experimental data are very difficult gathers, even and the success of cave completion, its increasing yield also is difficult to explain and analyze.And the utility model coal bed gas cave completion evaluation experimental facilities, have low cost, low-risk, simulation different reservoir environment, reusability, promptly can analyze the increasing yield of cave completion, can provide guidance for the on-the-spot technological design of coal bed gas cave completion again.
The above only is the schematic specific embodiment of the utility model, is not in order to limit scope of the present utility model.Any those skilled in the art, equivalent variations of having done under the prerequisite that does not break away from design of the present utility model and principle and modification all should belong to the scope that the utility model is protected.
Claims (8)
1. coal bed gas cave completion evaluation experimental facilities is characterized in that: described evaluation experimental device by square coal petrography model and grasping system thereof, three servo loading systems, gas-liquid pressurization injected systems, collect metering systems and the monitoring treatment systems constitute; This square coal petrography model and grasping system thereof are arranged in the framework, this square coal petrography model and grasping system thereof comprise a square coal petrography model, this coal petrography model bottom surface is provided with a upwardly extending simulation wellbore hole, coal petrography model end face is provided with the pressure tap of a plurality of downward extensions, the coal petrography model outside is provided with seal rubber sleeve, on six sides of the gum cover outside and corresponding coal petrography model, be fixed with pressing plate, position corresponding with simulation wellbore hole and pressure tap on described upper and lower side guide and gum cover is respectively equipped with open-work, is provided with the piezometer tube of band pressure sensor in each pressure tap; Described three servo loading systems comprise three servo pressurization oil cylinders, and these three oil cylinders are arranged on three directions in space in the coal petrography model outside and to the coal petrography model and exert pressure; Gas-liquid pressurization injected system comprise that sealing is arranged on down on the side guide and with the linker of simulation wellbore hole conducting, this linker top is provided with the piezometer tube of air inlet pipe, water inlet pipe and band pressure sensor, the linker bottom is provided with an electrical ball valve, this electrical ball valve lower end is connected with a relief tube, and this relief tube bottom correspondence is provided with a coal powder collection tank.
2. coal bed gas as claimed in claim 1 cave completion evaluation experimental facilities is characterized in that: described coal petrography model end face is provided with four pressure taps.
3. coal bed gas as claimed in claim 1 cave completion evaluation experimental facilities is characterized in that: the importer of each oil cylinder that pressurizes is to installing a servo valve respectively, is used for the switch and the oil inlet quantity of accurate by-pass valve control.
4. coal bed gas as claimed in claim 1 cave completion evaluation experimental facilities is characterized in that: described each servo pressurization oil cylinder is provided with power sensor and displacement transducer, and each servo pressurization oil cylinder is connected with the total digital controller of its action of control.
5. coal bed gas as claimed in claim 1 cave completion evaluation experimental facilities, it is characterized in that: described air inlet pipe is connected with the air pressure pressurized cylinder with first hydraulic pressure by first passage, described water inlet pipe is connected with the air pressure pressurized cylinder with second hydraulic pressure by second channel, these two pressurized cylinder are by a driven by servomotor, this first hydraulic pressure and air pressure pressurized cylinder are communicated with gas bomb and fluid reservoir by first selector switch, and this second hydraulic pressure and air pressure pressurized cylinder are communicated with gas bomb and fluid reservoir by second selector switch; Described first passage is provided with first one way valve of unidirectional conducting air inlet pipe, and described second channel is provided with second one way valve of unidirectional conducting water inlet pipe.
6. coal bed gas as claimed in claim 1 cave completion evaluation experimental facilities is characterized in that: described square coal petrography model is that cutting forms on raw coal; Square coal petrography model is of a size of 300mm * 300mm * 300mm; Described simulation wellbore hole diameter is 30mm, and the degree of depth is 200mm; The diameter of described each pressure tap is 6mm, and drilling depth is 160mm.
7. coal bed gas as claimed in claim 6 cave completion evaluation experimental facilities is characterized in that: described simulation wellbore hole is positioned at the center of coal petrography model bottom surface and upwards vertical extent setting, described each pressure tap correspondence be arranged on simulation wellbore hole around.
8. coal bed gas as claimed in claim 6 cave completion evaluation experimental facilities is characterized in that: described relief tube diameter is 30mm, 25mm, 20mm, 15mm, 10mm or 5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205077312U CN201794583U (en) | 2010-08-27 | 2010-08-27 | Well completion evaluation experiment device for coal bed methane cave |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102373919A (en) * | 2010-08-27 | 2012-03-14 | 中国石油大学(北京) | Experimental apparatus for evaluating coalbed methane cave well completion |
| CN102519768A (en) * | 2011-12-21 | 2012-06-27 | 中联煤层气有限责任公司 | Rock sample sealing structure used for three dimensional permeability determination |
| CN102680647A (en) * | 2012-04-20 | 2012-09-19 | 天地科技股份有限公司 | Coal-rock mass grouting reinforcement test bed and test method |
| CN103195401A (en) * | 2013-04-01 | 2013-07-10 | 中国矿业大学 | Coal reservoir yield increasing transforming experiment device under stratum conditions |
| CN103883302A (en) * | 2014-03-31 | 2014-06-25 | 中国矿业大学 | Method for manufacturing physical simulation test parts of coal-bed gas well hydraulic fractures |
| CN106124380A (en) * | 2016-06-22 | 2016-11-16 | 太原理工大学 | A kind of similarity simulation experiment is measured the device and method of coal column breathability |
| CN108533173A (en) * | 2018-04-18 | 2018-09-14 | 中煤科工集团西安研究院有限公司 | Gas medium power makes cave coal dust and returns row's mechanism simulation experimental provision and method |
| WO2020087861A1 (en) * | 2018-10-29 | 2020-05-07 | 中国矿业大学 | Coalbed methane horizontal well hole collapse de-stressed mining simulation test method |
| WO2020087860A1 (en) * | 2018-10-29 | 2020-05-07 | 中国矿业大学 | Coalbed methane horizontal well hole collapse pressure relief mining simulation test system |
| CN111472729A (en) * | 2020-03-27 | 2020-07-31 | 中国科学院广州能源研究所 | Natural gas hydrate cave well completion evaluation testing device and method |
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| CN102373919A (en) * | 2010-08-27 | 2012-03-14 | 中国石油大学(北京) | Experimental apparatus for evaluating coalbed methane cave well completion |
| CN102373919B (en) * | 2010-08-27 | 2014-03-26 | 中国石油大学(北京) | Experimental apparatus for evaluating coalbed methane cave well completion |
| CN102519768A (en) * | 2011-12-21 | 2012-06-27 | 中联煤层气有限责任公司 | Rock sample sealing structure used for three dimensional permeability determination |
| CN102680647B (en) * | 2012-04-20 | 2015-07-22 | 天地科技股份有限公司 | Coal-rock mass grouting reinforcement test bed and test method |
| CN102680647A (en) * | 2012-04-20 | 2012-09-19 | 天地科技股份有限公司 | Coal-rock mass grouting reinforcement test bed and test method |
| CN103195401A (en) * | 2013-04-01 | 2013-07-10 | 中国矿业大学 | Coal reservoir yield increasing transforming experiment device under stratum conditions |
| CN103883302A (en) * | 2014-03-31 | 2014-06-25 | 中国矿业大学 | Method for manufacturing physical simulation test parts of coal-bed gas well hydraulic fractures |
| CN106124380A (en) * | 2016-06-22 | 2016-11-16 | 太原理工大学 | A kind of similarity simulation experiment is measured the device and method of coal column breathability |
| CN106124380B (en) * | 2016-06-22 | 2019-01-15 | 太原理工大学 | The device and method of coal column gas permeability is measured in a kind of similarity simulation experiment |
| CN108533173A (en) * | 2018-04-18 | 2018-09-14 | 中煤科工集团西安研究院有限公司 | Gas medium power makes cave coal dust and returns row's mechanism simulation experimental provision and method |
| WO2020087861A1 (en) * | 2018-10-29 | 2020-05-07 | 中国矿业大学 | Coalbed methane horizontal well hole collapse de-stressed mining simulation test method |
| WO2020087860A1 (en) * | 2018-10-29 | 2020-05-07 | 中国矿业大学 | Coalbed methane horizontal well hole collapse pressure relief mining simulation test system |
| CN111472729A (en) * | 2020-03-27 | 2020-07-31 | 中国科学院广州能源研究所 | Natural gas hydrate cave well completion evaluation testing device and method |
| CN111472729B (en) * | 2020-03-27 | 2021-07-16 | 中国科学院广州能源研究所 | Evaluation and test method for natural gas hydrate cave well completion |
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