CN114251084B - Device and method for quickly and continuously measuring drilling gas flow while drilling - Google Patents
Device and method for quickly and continuously measuring drilling gas flow while drilling Download PDFInfo
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- CN114251084B CN114251084B CN202111388990.7A CN202111388990A CN114251084B CN 114251084 B CN114251084 B CN 114251084B CN 202111388990 A CN202111388990 A CN 202111388990A CN 114251084 B CN114251084 B CN 114251084B
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- 238000005553 drilling Methods 0.000 title claims abstract description 129
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000009471 action Effects 0.000 claims abstract description 37
- 239000012530 fluid Substances 0.000 claims description 51
- 238000005259 measurement Methods 0.000 claims description 20
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 14
- 238000007789 sealing Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 230000005484 gravity Effects 0.000 description 8
- 230000000903 blocking effect Effects 0.000 description 6
- 239000003245 coal Substances 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 6
- 239000002775 capsule Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/006—Accessories for drilling pipes, e.g. cleaners
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Remote Sensing (AREA)
- Mechanical Engineering (AREA)
- Sampling And Sample Adjustment (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention provides a device and a method for measuring drilling gas flow while drilling in rapid succession, wherein the device for measuring the drilling gas flow comprises: a drill pipe body and a first switch; the drill rod main body is in a hollow column shape, and a first switch, a cabin body and a gas flow measuring and positioning module are arranged at the hollow part of the drill rod main body; the wall of the drill rod main body is provided with a plurality of air holes, and a second switch is arranged at the position of each air hole on the outer surface of the drill rod main body; each air hole is communicated with an expansion bag, and the expansion bag is arranged in the cabin body; and the wall position of the drill rod main body corresponding to each expansion bag is provided with a through hole and a third switch, and each expansion bag can be contracted into the cabin body or expanded out of the drill rod main body through the corresponding through hole under the action of the corresponding second switch and third switch. The device for quickly and continuously measuring the gas flow of the drill hole while drilling has the advantages of simple structure, convenience in operation and capability of quickly and accurately measuring the gas flow.
Description
Technical Field
The invention belongs to the mine gas control technology, and particularly relates to a device for quickly and continuously measuring drilling gas flow while drilling.
Background
The reliable coal and gas outburst prediction method and the index are the basis of outburst prevention work, the continuous flow method is used as a dynamic prediction method, the measured index drilling gas flow can comprehensively reflect the ground stress, the gas pressure and the coal body strength in front of drilling so as to reflect the outburst risk in front of drilling, and the method and the index are used for predicting the outburst risk of the coal seam in front of the coal roadway tunneling working face.
The current equipment and method for measuring the gas flow of the drilling hole have the defects of complex equipment, multiple testing steps, complex operation, incapability of acquiring the gas flow in front of the drilling hole in real time, and the like, and if drilling rods with different functions are designed, the drilling rods are required to be connected according to a fixed sequence when in use, so that the drilling rods are not beneficial to underground quick connection, and meanwhile, a plurality of expansion hole sealers exist in the drilling hole when the flow is tested, so that the equipment loss is increased, and the drilling withdrawal time is increased. When the drilling hole is drilled to a certain position and the flow is required to be tested, the soft bag is manually sleeved on the drill rod sleeve, and the soft bag is taken down after the test is finished, so that the operation flow is increased. The defects cause the prior equipment for measuring the gas flow of the drilling hole to be unfavorable for technical application and equipment popularization.
In addition, the inventor also discovers that most of the prior equipment for measuring the gas flow of the drilling holes cannot effectively realize automatic sealing and unsealing of the drilling holes, and brings inconvenience to measurement.
Therefore, it is necessary to provide a device which is simple and easy to operate, can effectively realize automatic sealing and unsealing of the drilling hole, can monitor the gas flow in front of the drilling hole in real time, and provides device support for rapidly predicting the coal and gas outburst risk of the coal bed in front of the working face.
Disclosure of Invention
Therefore, an object of the present invention is to provide a device for measuring gas flow of a drilled hole while drilling, wherein an expansion bag can be contracted into a cabin body or expanded out of a drill rod main body to seal the drilled hole through a corresponding through hole under the action of a second switch and a third switch corresponding to the expansion bag, so as to realize automatic sealing and unsealing of the drilled hole; the first switch and the gas flow measuring and positioning module are combined, so that the gas flow can be measured rapidly and accurately; the whole device has simple structure and convenient operation.
The second aim of the invention is to provide a method for measuring the gas flow of a drilling hole in rapid succession while drilling.
To achieve the above object, an embodiment of a first aspect of the present invention provides a device for measuring a gas flow rate of a borehole while drilling, including: a drill pipe body and a first switch;
the drill rod main body is in a hollow column shape, and a first switch, a cabin body and a gas flow measuring and positioning module are arranged at the hollow part of the drill rod main body; the wall of the drill rod main body is provided with a plurality of air holes, and a second switch is arranged at the position of each air hole on the outer surface of the drill rod main body; each air hole is communicated with an expansion bag, and the expansion bag is arranged in the cabin body; each expansion bag is provided with a through hole and a third switch at the wall position of the drill rod main body corresponding to the expansion bag, and under the action of the second switch and the third switch corresponding to the expansion bag, the expansion bag can be contracted into the cabin body or expanded to the outside of the drill rod main body through the corresponding through holes to seal the drilling holes;
the first switch can open and close the hollow part of the drill rod main body under the action of fluid from the lower end of the hollow part of the drill rod.
According to the device for measuring the gas flow of the drilling hole rapidly and continuously while drilling, the expansion bag can be contracted into the cabin body or expanded to the outside of the drill rod main body to seal the drilling hole through the corresponding through holes under the action of the second switch and the third switch corresponding to the expansion bag, so that the automatic sealing and unsealing of the drilling hole are realized; the first switch and the gas flow measuring and positioning module are combined, so that the gas flow can be measured rapidly and accurately; the whole device has simple structure and convenient operation.
In addition, the device for measuring the gas flow of the drilling while drilling in quick succession according to the embodiment of the invention can also have the following additional technical characteristics:
in one embodiment of the present invention, the first switch, the plurality of air holes, the cabin, and the gas flow measuring and positioning module are disposed from top to bottom.
In one embodiment of the invention, the number of tanks is 1.
In one embodiment of the invention, the fluid is a wind current.
In one embodiment of the invention, the second switch is a solenoid valve.
In one embodiment of the invention, the first switch is a hinge switch.
In one embodiment of the invention, the hinge switch comprises a fixed sheet arranged on the inner wall of the drill rod main body and two first baffle sheets positioned above the fixed sheet; the two first baffle plates are symmetrically arranged in the hollow part of the drill rod main body, and in a natural state, the two first baffle plates are perpendicular to the wall of the drill rod main body and form an integral baffle plate capable of shielding the cross section of the hollow part of the whole drill rod main body; the lower surfaces of the two first baffle plates, which are close to one side of the inner wall of the drill rod main body, are rotationally connected with the fixing plate through hinges.
In one embodiment of the invention, the gas flow measurement and positioning module comprises a flow sensor, a concentration sensor, a position sensor, a battery and a signal transmitting module.
In one embodiment of the invention, the second switch is a spring switch, which comprises a shell, a second baffle and a first elastic piece; the shell is provided with a slotted hole from the bottom to the top and is arranged on the drill rod main body; one end of the second baffle plate is rotationally connected with the inner bottom of the shell, and the other end extends out of the slotted hole; one side of the second baffle plate far away from the slot hole is connected with the inside of the shell through the first elastic piece, and the second baffle plate can rotate in the slot hole towards the direction close to and far away from the bottom of the shell, so that the air hole is closed and opened.
In one embodiment of the invention, the first elastic member is a spring or a spring cord.
In one embodiment of the invention, the number of the cabins is equal to the number of the expansion bags, and the positions are in one-to-one correspondence; an expansion bag is arranged in each cabin body.
In one embodiment of the invention, the number of tanks is at least 2.
In one embodiment of the invention, a hollow slot is arranged above each through hole on the wall of the drill rod main body, and the hollow slot, the through holes and the corresponding cabin are communicated; a third switch is arranged in each hollow slot, and the third switch can move upwards or downwards in the hollow slot and the through hole below the hollow slot, so that the cabin body is in an open or closed state.
In one embodiment of the invention, the third switch comprises a hatch, a paddle and a second elastic member; the upper end of the hatch cover is positioned in the hollow slot position, and the top of the hatch cover is fixedly connected with the top of the hollow slot position through a second elastic piece; the lower end of the hatch cover extends into the through hole, and a certain interval is reserved between the bottom of the hatch cover and the bottom of the through hole; a poking plate is arranged at the position of the lower end of the hatch cover in the through hole, and one end of the poking plate extends out of the outer surface of the wall of the drill rod main body; the cabin cover can move upwards or downwards in the hollow groove and the through hole to open and close the cabin body.
In one embodiment of the invention, the hatch cover is contacted with the inner wall of the hollow groove position where the hatch cover is positioned through a smooth surface or a gap is reserved between the hatch cover and the inner wall of the hollow groove position.
In one embodiment of the invention, the hatch is sheet metal.
In one embodiment of the invention, the paddle is disposed perpendicular to the hatch, which is disposed parallel to the drill pipe body.
In one embodiment of the invention, the second elastic member is a spring or bungee cord;
in one embodiment of the invention, the plurality of pods are evenly distributed within the hollow portion of the drill pipe body along the circumference of the drill pipe.
To achieve the above object, according to a second aspect of the present invention, there is provided a method for measuring a gas flow rate of a borehole while drilling based on the apparatus as described above, comprising the steps of:
s100: in the drilling process, the position of a drill rod is monitored in real time through a gas flow measurement and positioning module, the pressure of fluid in a drilled hole is kept unchanged before the drill rod reaches a designed position, a second switch closes an air hole, a third switch closes a cabin under the action of the fluid, and the first switch is opened;
s200: stopping drilling and reducing the pressure of drilling fluid after reaching a designed position, opening an air hole by a second switch, opening a cabin by a third switch under the action of the fluid, closing a first switch, enabling the fluid to enter an expansion bag along the air hole, expanding the expansion bag and popping out the cabin, completely closing a gap between the drilling hole and a drill rod, and forming a closed space inside the drill rod;
s300: stay for a period of time by the drill rod, and measure the gas flow in the drill hole through the gas flow measuring and positioning module;
s400: after the measurement is completed, the pressure of drilling fluid is further reduced to 0, the expansion bag is exhausted and contracted under the action of pressure difference to retract the cabin, the pressure of drilling wind flow is increased to the pressure value in the step S100, and the next round of drilling and gas flow measurement work is performed;
and/or when the second switch is a spring switch, the closing of the air hole by the second switch in step S100 and the opening of the air hole by the second switch in step S200 are both performed under the action of fluid.
The method for measuring the gas flow of the drilling while drilling quickly and continuously according to the embodiment of the invention has basically the same advantages as the device for measuring the gas flow of the drilling while drilling quickly and continuously compared with the prior art, and is not repeated herein.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic cross-sectional view of an apparatus for measuring gas flow in a borehole while drilling in rapid succession according to one embodiment of the invention.
Fig. 2 is a schematic diagram of an apparatus for measuring a gas flow rate of a borehole while drilling according to an embodiment of the present invention in an operating state when the first switch is turned on, the second switch is turned off, and the third switch is turned off (i.e., a schematic diagram of a state of step S100 in a method for measuring a gas flow rate of a borehole while drilling).
Fig. 3 is a schematic diagram of an operating state of the apparatus for measuring a drilling gas flow while drilling according to an embodiment of the present invention when the first switch is turned off, the second switch is turned on, and the third switch is turned on (i.e., a schematic diagram of a state of step S200 in the method for measuring a drilling gas flow while drilling).
Fig. 4 is another schematic working state diagram of the apparatus for measuring the gas flow rate of the drilling while drilling according to an embodiment of the present invention when the first switch is turned off, the second switch is turned off, and the third switch is turned off (i.e., the state diagram of the expansion bladder retracting cabin in step S400 in the method for measuring the gas flow rate of the drilling while drilling).
Fig. 5 is a schematic diagram of the structure of a second switch of the apparatus for measuring gas flow in a borehole while drilling according to one embodiment of the present invention using a spring switch.
Fig. 6 is a schematic diagram of a structure of a device for measuring a gas flow rate of a borehole while drilling according to an embodiment of the present invention when a first switch is opened.
Reference numerals:
1-a drill rod main body; 2-drill pipe body wall; 3-cabin body; 4-expanding the pouch; 5-connecting the air path; 6-a second switch; 601-a second baffle; 602-a first elastic member; 603-a housing; 6031-first sub-housing; 6032-second sub-housing; 604-rotating the base; 605-a gasket; 606-slots; 7-a hatch cover; 8-shifting sheets; 9-a first switch; 901-a first baffle; 902-fixing sheets; 903-hinge; 10-a gas flow measuring and positioning module; 11-air holes; 12-a hollow groove position; 13-through holes; 14-limiting plates; 15-drilling holes; 16-a second elastic member.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The device for measuring the gas flow rate of the drilling gas while drilling and the method for measuring the gas flow rate of the drilling gas while drilling according to the embodiment of the invention are described below with reference to the accompanying drawings.
FIG. 1 is a schematic cross-sectional view of an apparatus for measuring gas flow in a borehole while drilling in rapid succession according to one embodiment of the invention.
As shown in fig. 1, a device for measuring drilling gas flow while drilling according to an embodiment of the present invention includes: a drill rod body 1 and a first switch 9; the drill rod main body 1 is in a hollow column shape, and a first switch 9, a cabin 3 and a gas flow measuring and positioning module 10 are arranged at the hollow part of the drill rod main body 1; a plurality of air holes 11 are formed in the drill rod main body wall 2, and a second switch 6 is arranged at the position of each air hole 11 positioned on the outer surface of the drill rod main body 1; each air hole 11 is communicated with an expansion bag 4, and the expansion bag 4 is arranged in the cabin 3; a through hole 13 and a third switch are arranged at the position of the wall 2 of the drill rod main body corresponding to each expansion bag 4, and each expansion bag 4 can be contracted into the cabin 3 or expanded out of the drill rod main body 1 to seal the drilling hole 15 through the corresponding through hole 13 under the action of the corresponding second switch 6 and third switch; the first switch 9 can open and close the hollow of the drill rod body 1 by fluid from the lower end of the hollow of the drill rod.
It will be appreciated that the hollow cylinder may be a hollow cylinder or a hollow prism, preferably a hollow cylinder. The capsule 2 is provided for receiving the inflation bladder, and thus is a housing, which may be particularly a housing having a shape of a shell, such as a semi-cylindrical shell, the cylindrical surface of which corresponds to the radius of the cylindrical surface of the inner surface of the hollow portion of the drill rod body. In an alternative embodiment, the capsule employs a metal shell, such as an iron shell, welded to the drill pipe body wall.
The expansion bag 4 is a bag with certain elasticity and strength, and can completely fill the gap between the drill rod main body and the drill hole after the expansion bag is completely expanded, so as to form a closed environment.
According to the device for measuring the gas flow of the drilling hole rapidly and continuously while drilling, the expansion bag can be contracted into the cabin body or expanded to the outside of the drill rod main body to seal the drilling hole through the corresponding through holes under the action of the second switch and the third switch corresponding to the expansion bag, so that the automatic sealing and unsealing of the drilling hole are realized; the first switch and the gas flow measuring and positioning module are combined, so that the gas flow can be measured rapidly and accurately; the whole device has simple structure and convenient operation.
In some embodiments, as shown in fig. 1, the first switch 9, the plurality of air holes 11, the cabin 3, and the gas flow measurement and positioning module 10 are disposed from top to bottom, and a space is left between two adjacent air holes.
In some embodiments, the fluid is a wind flow, but is not limited to a wind flow, a water flow, and the like.
In some embodiments, the first switch 9 is a hinge switch. As shown in fig. 6, the hinge switch comprises a fixing piece 902 installed on the inner wall of the drill rod main body and two first blocking pieces 901 positioned above the fixing piece 902; the two first baffle plates 901 are symmetrically installed in the hollow part of the drill rod main body 1, and in a natural state, the two first baffle plates 901 are in a vertical state with the drill rod main body, and form an integral baffle plate capable of shielding the cross section of the hollow part of the whole drill rod main body (can be understood as shielding the whole cross section of the hollow part in the whole drill rod main body 1 as shown in fig. 3 and 4), a closed space is formed in the drill rod main body, and when the acting force of drilling fluid is large, the two first baffle plates 901 of the pushing hinge switch move upwards, and fluid can carry drill cuttings to pass through the hollow part of the drill rod main body 1. The lower surfaces of the two first baffle plates 901, which are close to the inner wall of the drill rod main body, are rotationally connected with the fixing plates 902 through hinges 903. The hinge is a common hinge, that is, a structure that two metal sheets with a plurality of mounting holes are connected together through a rotating shaft.
Optionally, both the first blocking plates 901 are made of metal, such as iron plates or steel plates. The fixing piece is fixed on the inner wall of the hollow part of the drill rod main body 1 through a rivet. The fixing piece can be two independent thin plates respectively used for installing the two first baffle plates, or can be an integral thin plate used for uniformly connecting the two first baffle plates.
It will be appreciated that each first stop 901 has a shape and size corresponding to half the cross-sectional area of the hollow portion of the drill pipe body 1, such as a semi-cylindrical shape when the hollow portion of the drill pipe body is cylindrical, and a radius corresponding to the radius of the hollow portion. In order to enable the two first baffles to open under the action of fluid or form an integral closed borehole inside in a natural state, the two first baffles are in smooth contact with the wall of the drill rod main body.
In some embodiments, the gas flow measurement and positioning module 10 includes a flow sensor, a concentration sensor, a position sensor, a battery, and a signal emitting module. The flow sensor, the concentration sensor and the position sensor are all electrically connected with the battery through cables, and the flow sensor, the concentration sensor and the position sensor are all connected with the signal transmitting module through wireless connection or 5G signals, and the signal transmitting module is connected with the field control system through wireless connection or 5G signals. In the embodiment of the invention, the flow sensor, the concentration sensor, the position sensor and the signal transmitting module can all adopt the conventional flow sensor, the gas concentration sensor, the position sensor and the signal transmitting module. It will be appreciated that, in order to avoid the influence of the internal environment of the well, a protective cover needs to be installed outside the gas flow measurement and positioning module 10, and the protective cover is in sealing connection with the inner wall of the hollow part of the drill rod main body, for example, the protective cover adopts a metal net shell such as iron or aluminum alloy, and is in sealing and fixed connection with the inner wall of the hollow part of the drill rod main body through bolts, sealing gaskets and the like.
In some embodiments, the second switch 6 is mounted on the outer surface of the drill rod body at a position above the air hole.
In some embodiments, the second switch 6 is a solenoid valve, such as a mining explosion-proof solenoid valve or the like. When the second switch adopts an electromagnetic valve, the second switch is connected with the field control system through wireless connection or 5G signal connection.
In other embodiments, the second switch 6 is a spring switch, as shown in fig. 5, which includes a housing 603, a second blocking piece 601, and a first elastic member 602; the shell 603 is provided with a slotted hole 606 from bottom to top, and the shell 603 is arranged on the drill rod main body 1; one end of the second baffle 601 is rotatably connected with the inner bottom of the shell 603, and the other end extends out of the slotted hole 606; the side of the second baffle 601 away from the slot 606 is connected with the shell 603 through the first elastic piece 602, and the second baffle 601 can rotate in the slot 606 towards the direction of approaching and separating from the bottom of the shell 603, so as to close and open the air hole 11.
It can be understood that when no other external force exists, the second baffle can be relatively fixed in the shell and the slot under the tensile force of the first elastic piece; when the pressure from the side of the first elastic piece is larger than the tensile force of the first elastic piece, the second baffle piece can rotate and move in the slot hole in the direction away from the first elastic piece and close to the bottom of the shell.
Alternatively, the second blocking piece 601 is a metal piece having a certain hardness, such as an iron piece, a steel piece, or the like. It will be appreciated that the second spacer material may be selected to have a certain degree of stiffness to ensure that it will not buckle or break under the action of fluid (e.g. wind pressure) to ensure that it will act to close and open the air holes in the drill pipe under the action of fluid. At the same time, the second baffle can not be too thick or too thin, so that the material is wasted too thick, the baffle is not easy to act under the fluid, and the baffle is too thin and easy to bend, so that the thickness of the second baffle 601 is 5-10mm optionally. The width and the length of the second baffle are designed according to the size of the open air hole on the drill rod, so that the open air hole on the drill rod can be covered, and meanwhile, the size of the slot hole is also required to be considered, so that the second baffle can rotate in the slot hole.
Optionally, the second blocking piece 601 is rotatably connected to the inner bottom of the housing 603 through a rotating base 604. Specifically, the rotating base is welded at the bottom of the shell, a first through hole is formed in the rotating base, an inserting rod is arranged in the first through hole, the diameter of the inserting rod is smaller than that of the first through hole, two ends of the inserting rod extend out of the first through hole and are inserted into the insertion holes at the lower end of the second baffle, and the inserting rod is fastened through nuts. Therefore, the second baffle plate can be connected with the rotating base in a rotating way, and meanwhile, under the combined action of the first elastic piece, the second baffle plate is relatively fixed. Preferably, the rotating base may be divided into a first sub-rotating base and a second sub-rotating base, and the connection manner between the first sub-rotating base and the second baffle is similar to that when the rotating base is the whole.
Optionally, for ease of installation on the drill pipe body, the second switch of the present embodiment further includes a spacer 605 disposed at the bottom of the housing 603. The gasket can be integrally fixed at the bottom of the shell, the edge of the gasket extends out of the reserved mounting hole of the shell, or the gasket can be formed by a plurality of sub gaskets which are provided with reserved mounting hole positions and are fixed at the outer side of the bottom of the shell. Preferably, the gasket is divided into four sub gaskets, the four sub gaskets are respectively fixed (can be welded or connected by bolts) at the outer sides of four corners of the bottom of the shell, the four sub gaskets and the bottom of the shell are positioned in the same plane, each sub gasket is provided with a reserved mounting hole site, and the second switch can be fixed on the drill rod main body by inserting rivets of the reserved mounting hole sites when in use.
Alternatively, the first resilient member 602 is a spring or a spring cord, preferably a spring.
Optionally, for easy disassembly and maintenance, the housing 603 is formed by detachably connecting a first sub-housing 6031 and a second sub-housing 6032 that are symmetrical to each other, and a specific manner of detachable connection may be bolting, snapping, or the like.
Alternatively, the slot 606 has an L-shaped longitudinal section, and more specifically, the slot 606 extends from the bottom of the housing 603 to a position on the top of the housing 603 where the second blocking piece 601 can pass through.
Optionally, a metal ring (such as an iron ring) for connecting with the first elastic member 602 is welded on the second baffle 601, and a metal ring (such as an iron ring) for connecting with the first elastic member 602 is welded in the housing 603, and when the first elastic member 602 selects a spring, two ends of the spring are respectively connected with the second baffle and the metal ring of the housing, so that the spring has a certain tensile force.
When the second switch is a spring switch, the washer 605 is fixed on the drill rod main body wall 2 by rivets, so that the whole second switch is mounted on the drill rod main body. When the pressure (such as airflow pressure) of the fluid entering the drill hole is greater than the tensile force of the first elastic piece 602, the second baffle 601 rotates and moves from the top of the shell 603 to the bottom of the shell 603 in the slot 606 under the action of the fluid pressure, that is, the second baffle 601 moves towards the air hole direction, so as to cover the air hole 11 on the drill rod main body wall, and cover and close the air hole 11 on the drill rod main body wall 2; when the fluid pressure is reduced to be smaller than the tensile force of the first elastic member 602, the second baffle 601 is acted on the side far away from the drill rod main body wall 2 by the tensile force of the first elastic member 602, that is, far away from the air hole 11, the air hole 11 is opened, the fluid enters the expansion bladder 4, and the expansion bladder 4 expands.
It will be appreciated that the number of vents, the number of inflatable bladders, the number of second switches, the number of through holes and the number of third switches are all comparable.
It will be appreciated that in embodiments of the invention, the number of pods may be 1 or more. When the cabin number is 1, along the whole setting of drilling rod main part inner wall circumference, each inflation bag is all placed in this cabin, just every inflation bag corresponds an gas pocket, second switch, through-hole and third switch respectively, and each inflation bag inflation seals the space between drilling and the drilling rod together outside the drilling rod main part. When the number of the cabins is more than 2, the number of the cabins 3 is equal to the number of the expansion bags 4, and the positions are in one-to-one correspondence; an expansion bag 4 is arranged in each cabin 3. At this time, each expansion bag corresponds to an air hole, a second switch, a through hole, a third switch and a cabin body respectively.
When the number of the cabin bodies 3 is equal to that of the expansion bags 4, a hollow slot 12 is arranged above each through hole 13 on the drill rod main body wall 2, and the hollow slot 12, the through holes 13 and the cabin bodies 3 corresponding to the hollow slot 12 are communicated; a third switch is arranged in each hollow slot 12, and the third switch can move upwards or downwards in the hollow slot 12 and the through hole 13 below the hollow slot, so that the cabin 3 is in an open or closed state.
It is understood that the hollow slot can be regarded as a blind hole in the drill pipe body wall from the top end face of the through hole upwards.
In the embodiment of the present invention, the third switch structure is not limited as long as it can realize the function of opening and closing the cabin by moving upward or downward in the hollow slot and the through hole 13 therebelow. A preferred third switch structure may be: the third switch comprises a hatch 7, a poking piece 8 and a second elastic piece 16; the upper end of the hatch cover 7 is positioned in the hollow slot 12, and the top of the hatch cover is fixedly connected with the top of the hollow slot 12 through a second elastic piece 16; the lower end of the hatch cover 7 extends into the through hole 13, and a certain interval is reserved between the bottom of the hatch cover and the bottom of the through hole 13; the lower end of the hatch cover 7 is provided with a poking piece 8 at a position in the through hole 13, and one end of the poking piece 8 extends out of the outer surface of the drill rod main body wall 2; the hatch 7 can move upwards or downwards in the hollow slot 12 and the through hole 13 to open and close the hatch 3.
It will be appreciated that a certain distance is left between the bottom of the hatch and the bottom of the through hole, indicating that the pulling force of the second elastic member is greater than the gravity of the hatch. Let the second elastic member pull force be F 1 The gravity of the hatch cover is G, the tension of the second elastic piece is larger than the gravity G of the hatch cover, and the hatch cover is provided with the second elasticityThe elastic member is fixed in the hollow groove of the wall of the drill rod main body under the action of the tensile force, and when the acting force of the fluid is larger than the tensile force F of the second elastic member in the drilling process 1 When the gravity G of the cabin cover is added, the fluid presses the poking piece, the cabin cover moves downwards to cover the cabin body, the expansion bag cannot be ejected in the cabin body, and when the acting force of the fluid is smaller than the pulling force F of the second elastic piece 1 When the sum of the gravity G of the hatch is taken up, the hatch is sprung upwards and the expansion bladder can be sprung out of the hatch to fill the space between the borehole 15 and the drill rod body 1.
It will be appreciated that there are a variety of implementations in which the hatch can be moved up or down within the hollow slot and through hole, such as: in some embodiments, the hatch 7 is contacted with the inner wall of the hollow slot 12 where the hatch is positioned through a smooth surface; in other embodiments, a gap is reserved between the hatch cover 7 and the inner wall of the hollow slot 12 where the hatch cover is positioned; etc. The shape and size of the hatch cover are equal to those of the hatch body, or the shape and size of the hatch cover are equal to those of the hatch body, the size of the hatch cover is slightly larger than that of the hatch body on one side of the hatch body, for example, when one side of the hatch body is semi-cylindrical, the hatch cover is also preferably semi-cylindrical, and the two hatch covers are coaxially arranged, and the cylindrical height and the arc length of the hatch cover are equal to or slightly larger than those of the hatch body.
In some embodiments, the hatch 7 is a metal sheet with a certain thickness, such as a steel sheet or an iron sheet, etc., and the thickness is preferably capable of sliding up and down in the hollow slot.
In some embodiments, in order to maximize the surface of the paddle with the fluid in the borehole, the paddle 8 is positioned perpendicular to the hatch 7, and the hatch 7 is positioned parallel to the drill pipe body 1. In addition, preferably, in order to limit the position where the poking plate drives the hatch cover to move downwards under the action of fluid, a limiting plate 14 is arranged on the outer surface of the drill rod main body wall 2, the upper surface of the limiting plate 14 is flush with the bottom of the through hole 13, and the limiting plate 14 corresponds to the upper and lower positions of the poking plate 8. More preferably, the lower surface of the poking piece 8 is provided with a groove, and the upper surface of the limiting plate 14 is provided with a protrusion which is clamped with the groove. It can be understood that, considering that the fluid pressure is smaller, the poking plate drives the cabin cover to move upwards, so that the clamping of the groove and the bulge belongs to the natural contact clamping but is not locked.
In some embodiments, the second elastic member 16 is a spring or bungee cord, preferably a spring.
In some embodiments, each cabin 3 is provided with a cabin air hole, one end of the cabin air hole is communicated with the air hole 11 of the drill rod main body wall 2 through the communication air passage 5, and the other end of the cabin air hole is communicated with an air inlet and outlet of the expansion bag 4 in the cabin 3.
In some embodiments, the plurality of pods 3 are evenly distributed within the hollow portion of the drill pipe body 1 along the circumference of the drill pipe. The number of the capsule bodies 3 can be set according to the requirement, so long as the gap between the drill rod main body and the drill hole can be sealed when the expansion bag is expanded. However, considering the factors of simple structure, low cost, small influence on the strength of the drill rod main body, the number of the cabins 3 is preferably 2. Alternatively, in order to allow the expansion bladder to expand out of the capsule as quickly as possible, the gap between the drill rod body and the borehole is sealed, the height of the through hole 13 being comparable to the height of the capsule 3, and preferably the width.
The working principle of the third switch is as follows: in the normal drilling process, when the fluid pressure in the drilling hole is larger than the tensile force of the second elastic piece 16, the poking piece 8 drives the hatch cover 7 to move downwards under the action of the fluid pressure, and the hatch cover 7 closes the hatch body 3; when the drilling is carried out to the measuring position, the fluid pressure is reduced and is smaller than the second elastic piece 16, the hatch cover 7 is pulled upwards under the action of the pulling force of the second elastic piece 16, the hatch body 3 is in an open state, the expansion bag 4 is opened and expanded to the outside of the hatch body 3 under the action of wind flow, and the gap between the drilling hole 15 and the drill rod main body 1 is filled.
When the device for measuring the gas flow of the drill hole while drilling rapidly and continuously according to the embodiment of the invention works, fluid entering the drill hole is taken as wind flow, as shown in fig. 2, the wind flow of the drill hole is pressed in along the gap between the drill hole 15 and the drill rod main body 1, and the drill cuttings are discharged from the hollow part of the drill rod main body, when the pressure of the wind flow of the drill hole is p 1 When the gas filling machine is in use, the second switch 6 and the hatch cover 7 are closed under the action of wind pressure, the first switch 9 is opened under the action of wind pressure, and at the moment, the gas cannot enter the expansion bag 4, so that drilling is performed normally. As shown in fig. 3, when the drill rod body 1 reaches a specified position, the drilling wind is loweredPressure of the stream to p 2 The second switch 6 and the hatch cover 7 are opened, gas enters the expansion bag 4 along a gas passage, the expansion bag 4 expands and pops out from the hatch body 3, a gap between the drill rod main body 1 and the drilling hole 15 is closed, meanwhile, the first switch 9 is closed, a closed space is formed, gas in front of drilling enters the hollow part of the drill rod main body, gas flow data are measured and transmitted through a flow sensor in the gas flow measuring and positioning module 10, and gas concentration data are measured and transmitted through a concentration sensor in the gas flow measuring and positioning module 10. As shown in fig. 4, after the measurement is completed, the pressure of the drilling wind flow is continuously reduced to 0, the gas in the expansion bag 4 is discharged to the outside under the action of the pressure difference, the expansion bag 4 is contracted into the cabin 3, and then the wind flow is increased to p 1 The hatch cover 7 and the second switch 6 are closed again, the first switch 9 is opened again, and a new round of drilling measurement work is started. In the whole working process, the position of the drill rod main body entering the drill hole is monitored in real time through a position sensor of the gas flow measuring and positioning module 10.
The method for measuring the gas flow of the drilling holes while drilling quickly and continuously, which is provided by the embodiment of the invention, is based on the device for measuring the gas flow of the drilling holes while drilling quickly and continuously, and comprises the following steps:
s100: in the drilling process, the position of a drill rod is monitored in real time through a gas flow measurement and positioning module 10, the pressure of fluid in a drill hole 15 is kept unchanged before the drill rod reaches a design position, a second switch 6 closes an air hole 11, a third switch closes a cabin 3 under the action of the fluid, and a first switch 9 is opened;
s200: stopping drilling and reducing the pressure of the fluid in the drilling hole 15 after reaching the designed position, opening the air hole 11 by the second switch 6, opening the cabin 3 by the third switch under the action of the fluid, closing the first switch 9, allowing the fluid to enter the expansion bag 4 along the air hole 11, expanding the expansion bag 4 and popping out the cabin 3, completely closing the gap between the drilling hole 15 and the drill rod, and forming a closed space in the drill rod;
s300: the drill rod stays for a period of time, and the gas flow in the drill hole 15 is measured through the gas flow measuring and positioning module 10;
s400: after the measurement is completed, the pressure of the fluid in the drilling hole 15 is further reduced to 0, the expansion bag 4 is exhausted and contracted under the action of the pressure difference to retract the cabin body 3, the pressure of the wind flow in the drilling hole 15 is increased to the pressure value in the step S100, and the next round of drilling and the measurement of the gas flow are performed.
In some embodiments, when the second switch 6 is a spring switch, the closing of the air hole 11 by the second switch 6 in step S100 and the opening of the air hole 11 by the second switch 6 in step S200 are both performed under the action of fluid.
Taking the situation that fluid in a borehole is wind current as an example, the method for measuring the gas flow of the borehole while drilling in the embodiment of the invention is based on the device for measuring the gas flow of the borehole while drilling in rapid succession, wherein the second switch adopts a spring switch, the first elastic piece and the second elastic piece both adopt springs, and the method for measuring the gas flow of the borehole specifically comprises the following steps:
1) As shown in fig. 2, the position of the drill rod main body is monitored in real time by a position sensor in the gas flow measuring and positioning module 10 during drilling, and the pressure of the wind flow in the drill hole 15 is kept p before the designed position is reached 1 Unchanged, wherein the force of the wind flow acting on the third switch blade 8 is greater than the tension force F of the second elastic member 16 1 And the sum of the gravity G of the hatch cover 7, the hatch cover 7 moves downwards to cover the hatch body 3; while the force of the wind flow acting on the second flap 601 of the second switch 6 is greater than the tension force F of the first elastic member 602 2 The second baffle 601 covers the air hole 11 on the drill rod main body wall 2; the force of the wind flow acting on the first flap 901 of the first switch 9 is greater than the weight of the first flap 901 of the first switch 9, the first switch 9 being open.
2) As shown in FIG. 3, drilling is stopped and the pressure of the drilling wind stream is adjusted to p after the design position is reached 2 Wherein p is 1 >p 2 The force of the wind flow acting on the pulling piece 8 of the third switch is smaller than the pulling force F of the second elastic piece 16 1 And the sum of gravity G of the hatch cover 7, the hatch cover 7 is sprung upwards, and the hatch body 3 is opened; at the same time, the acting force of the wind flow on the second baffle 601 of the second switch 6 is smaller than the tensile force F of the first elastic piece 602 2 The air hole 11 on the drill rod main body wall 2 is opened, and the air flow enters the expansion bag along the air hole 114, expanding the expansion bag 4 and ejecting the cabin 3 to completely close the gap between the drill hole 15 and the drill rod main body 1; the acting force of the wind flow on the first baffle 901 of the first switch 9 is smaller than the gravity of the first baffle 901 of the first switch 9, the first switch 9 is closed, and a closed space is formed inside the hollow part of the drill rod main body 1.
3) The drill rod body 1 stays for a period of time and the gas flow in the borehole 15 is measured by means of a flow sensor in the gas flow measuring and positioning module 10.
4) After the measurement is completed, the pressure of the drilling wind flow is further reduced to 0, the expansion bag 4 is exhausted and contracted under the action of pressure difference to retract the cabin body 3, and the pressure of the drilling wind flow is increased to p 1 And carrying out the next round of drilling and gas flow measurement.
In summary, according to the device for quickly and continuously measuring the gas flow of the drill hole while drilling, disclosed by the embodiment of the invention, the expansion and contraction of the expansion bag can be automatically completed by controlling the opening and closing states of the valves of the pressure control valves of the fluid in the drill hole, so that the automatic hole sealing and unsealing of the gap between the drill rod main body and the drill hole are realized, the gas flow is measured, and the problems that the drill hole is not easy to seal and the gas flow is not easy to measure in the drilling process are solved. The whole device is simple and easy to operate, and the gas flow measured by the device is accurate.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (8)
1. A device for measuring gas flow in a borehole in rapid succession while drilling, comprising: a drill pipe body and a first switch;
the drill rod main body is in a hollow column shape, and a first switch, a cabin body and a gas flow measuring and positioning module are arranged at the hollow part of the drill rod main body; the wall of the drill rod main body is provided with a plurality of air holes, and a second switch is arranged at the position of each air hole on the outer surface of the drill rod main body; each air hole is communicated with an expansion bag, and the expansion bag is arranged in the cabin body; each expansion bag is provided with a through hole and a third switch at the wall position of the drill rod main body corresponding to the expansion bag, and under the action of the second switch and the third switch corresponding to the expansion bag, the expansion bag can be contracted into the cabin body or expanded to the outside of the drill rod main body through the corresponding through holes to seal the drilling holes;
the first switch can open and close the hollow part of the drill rod main body under the action of fluid from the lower end of the hollow part of the drill rod;
the first switch, the plurality of air holes, the cabin body and the gas flow measuring and positioning module are arranged from top to bottom;
the second switch is a spring switch, and the second switch opens or closes the corresponding air hole under the action of the fluid;
the number of the cabin bodies is equal to that of the expansion bags, and the positions of the cabin bodies are in one-to-one correspondence; an expansion bag is arranged in each cabin body; the number of the cabins is at least 2;
a hollow slot is arranged above each through hole in the wall of the drill rod main body, and the hollow slot, the through holes and the corresponding cabin are communicated; and a third switch is arranged in each hollow slot, and can move upwards or downwards in the hollow slot and the through hole below the hollow slot under the action of the fluid, so that the cabin body is in an open or closed state.
2. The apparatus for measuring gas flow in a borehole in rapid succession while drilling of claim 1, wherein the fluid is a wind stream.
3. The device for measuring the gas flow rate of a drilled hole while drilling in rapid succession according to claim 1 or 2, characterized in that the first switch is a hinge switch;
and/or the hinge switch comprises a fixed sheet arranged on the inner wall of the drill rod main body and two first baffle sheets positioned above the fixed sheet; the two first baffle plates are symmetrically arranged in the hollow part of the drill rod main body, and in a natural state, the two first baffle plates are perpendicular to the wall of the drill rod main body and form an integral baffle plate capable of shielding the cross section of the hollow part of the whole drill rod main body; the lower surfaces of the two first baffle plates, which are close to one side of the inner wall of the drill rod main body, are rotationally connected with the fixing plate through hinges.
4. The apparatus for rapid and continuous measurement while drilling of gas flow according to claim 1, wherein the gas flow measurement and positioning module comprises a flow sensor, a concentration sensor, a position sensor, a battery and a signal transmitting module.
5. The device for measuring gas flow rate of a borehole in rapid succession while drilling of claim 1, wherein the second switch comprises a housing, a second baffle and a first elastic member; the shell is provided with a slotted hole from the bottom to the top and is arranged on the drill rod main body; one end of the second baffle plate is rotationally connected with the inner bottom of the shell, and the other end extends out of the slotted hole; one side of the second baffle plate far away from the slot hole is connected with the inside of the shell through the first elastic piece, and the second baffle plate can rotate in the slot hole towards the direction close to and far away from the bottom of the shell to close and open the air hole;
and/or the first elastic element is a spring or a spring cord.
6. The device for measuring gas flow in a borehole in rapid succession while drilling of claim 1, wherein the third switch comprises a hatch, a paddle and a second elastic member; the upper end of the hatch cover is positioned in the hollow slot position, and the top of the hatch cover is fixedly connected with the top of the hollow slot position through a second elastic piece; the lower end of the hatch cover extends into the through hole, and a certain interval is reserved between the bottom of the hatch cover and the bottom of the through hole; a poking plate is arranged at the position of the lower end of the hatch cover in the through hole, and one end of the poking plate extends out of the outer surface of the wall of the drill rod main body; the cabin cover can move upwards or downwards in the hollow groove and the through hole to open and close the cabin body.
7. The device for quickly and continuously measuring the gas flow rate of a drilled hole while drilling according to claim 6, wherein the hatch cover is contacted with the inner wall of the hollow slot position where the hatch cover is positioned through a smooth surface or a gap is reserved between the hatch cover and the inner wall of the hollow slot position;
and/or the hatch cover is a sheet metal.
And/or the poking piece is arranged vertically with the hatch cover, and the hatch cover is arranged in parallel with the drill rod main body;
and/or the second elastic piece is a spring or elastic rope;
and/or the plurality of cabins are uniformly distributed in the hollow part of the drill rod main body along the circumferential direction of the drill rod.
8. A method for measuring a borehole gas flow rate in rapid succession while drilling based on a device according to any one of claims 1 to 7, comprising the steps of:
s100: in the drilling process, the position of a drill rod is monitored in real time through a gas flow measurement and positioning module, the pressure of fluid in a drilled hole is kept unchanged before the drill rod reaches a designed position, a second switch closes an air hole, a third switch closes a cabin under the action of the fluid, and the first switch is opened;
s200: stopping drilling and reducing the pressure of drilling fluid after reaching a designed position, opening an air hole by a second switch, opening a cabin by a third switch under the action of the fluid, closing a first switch, enabling the fluid to enter an expansion bag along the air hole, expanding the expansion bag and popping out the cabin, completely closing a gap between the drilling hole and a drill rod, and forming a closed space inside the drill rod;
s300: stay for a period of time by the drill rod, and measure the gas flow in the drill hole through the gas flow measuring and positioning module;
s400: after the measurement is completed, the pressure of drilling fluid is further reduced to 0, the expansion bag is exhausted and contracted under the action of pressure difference to retract the cabin, the pressure of drilling wind flow is increased to the pressure value in the step S100, and the next round of drilling and gas flow measurement work is performed;
the closing of the air hole by the second switch in step S100 and the opening of the air hole by the second switch in step S200 are both performed under the action of fluid.
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