CN114541967A - Pneumatic gravel coring bit and pneumatic gravel coring method - Google Patents
Pneumatic gravel coring bit and pneumatic gravel coring method Download PDFInfo
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- CN114541967A CN114541967A CN202210069905.9A CN202210069905A CN114541967A CN 114541967 A CN114541967 A CN 114541967A CN 202210069905 A CN202210069905 A CN 202210069905A CN 114541967 A CN114541967 A CN 114541967A
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- diameter part
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000011435 rock Substances 0.000 claims abstract description 33
- 238000009434 installation Methods 0.000 claims abstract description 12
- 238000007789 sealing Methods 0.000 claims description 21
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 18
- 230000000903 blocking effect Effects 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 229910052742 iron Inorganic materials 0.000 claims description 9
- 239000002390 adhesive tape Substances 0.000 claims description 6
- 238000005553 drilling Methods 0.000 abstract description 14
- 238000005520 cutting process Methods 0.000 description 13
- 239000007789 gas Substances 0.000 description 9
- 230000008569 process Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 6
- 238000009527 percussion Methods 0.000 description 6
- 239000012530 fluid Substances 0.000 description 4
- 230000006378 damage Effects 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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Classifications
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- 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
- E21B10/00—Drill bits
- E21B10/02—Core bits
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- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/16—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using gaseous fluids
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- 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
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
-
- 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
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/06—Down-hole impacting means, e.g. hammers
- E21B4/14—Fluid operated hammers
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to the technical field of geological drilling, in particular to a pneumatic gravel coring bit and a pneumatic gravel coring method, wherein the pneumatic gravel coring bit comprises an upper bit connector, an inner pipe, an outer pipe and a bit, and the upper bit connector comprises a first large diameter part and a first small diameter part which are fixedly installed together from top to bottom; the latter step is as follows: (1) and connecting the pneumatic impactor with the drill bit upper joint through the impactor joint. The pneumatic hammer drill bit has the advantages that the structure is reasonable and compact, the conception is ingenious, the pneumatic impactor is driven by the airflow generated by the air compressor to act on the upper joint of the drill bit, the impact force generated by the pneumatic impactor crushes rock samples such as gravels and the like, the rock samples enter the inner pipe and are gathered to form a rock core, the impact airflow sequentially enters the upper air outlet hole and the annular cavity along the installation blind hole and is discharged from the lower air outlet hole to be blown to the bottom of the well forcibly, and therefore residual residues at the bottom of the well return to the ground along with the airflow; through setting up two detachable fixed mounting's half close the pipe together, be convenient for take out the core from the inner tube, have reliable, stable and get effectual characteristics of core.
Description
Technical Field
The invention relates to the technical field of geological drilling, in particular to a pneumatic gravel coring bit and a pneumatic gravel coring method.
Background
Core is got in drilling is a commonly used technical means of carrying out geological survey, and the performance of drill bit directly influences the cost and the efficiency of getting core work, and along with constantly improving to geological survey requirement, the stratum of surveying is more and more complicated, and when carrying out core is got in drilling, in order to reduce the influence of broken topography surface rock and soil to the rock core sample, in actual production process, often adopt the twin-drum to get core in drilling. The general double-barrel drill consists of a main drill bit and a protective drill bit, wherein the main drill bit is positioned inside the protective drill bit, and the main drill bit is protected by the protective drill bit, so that the influence of the crushed surface rock on core sampling is reduced.
The core is a first original complete material obtained in the exploration and development processes of petroleum and natural gas (energy sources such as coal bed gas, shale gas and the like), and a scheme can be provided for formulating an effective reasonable scheme, accurately calculating the oil gas reserves and formulating yield-increasing measures through a large amount of analysis and research on the core. In each stage of exploration and development of oil and gas fields (energy sources such as coal bed gas, shale gas and the like), in order to find out the properties of oil and gas storage layers or to check the development effect of the oil and gas fields from stratum contrast of a large area, evaluate and improve the development scheme of the oil and gas fields, any research step cannot be observed and researched on the rock core. Several important links of drilling coring: (1) forming a core: crushing the rock at the bottom of the well in an annular drilling mode; (2) protecting the core: when drilling and coring, the formed core is protected, and the phenomenon that the circulating drilling fluid erodes the core and the mechanical collision of the rotation of the drill column damages the core is avoided; (3) taking out the core: after a certain length of core is drilled (usually a single long bottom, also can be long barrel core up to tens of meters or even hundreds of meters), the core is cut from the bottom of the formed core and clamped, and the core is lifted to the ground along with the drill bit when the drill bit is pulled out. The three links are required to be well done when the core is drilled and cored, and any link is not properly processed, so that the core with the required quantity (length) cannot be obtained, and the core cannot be taken out due to failure of coring in serious cases.
Chinese patent publication No. CN206158642U discloses a core extraction drill bit for geological exploration, which comprises: the drill rod comprises an outer cylinder and an inner cylinder which are coaxially and rotatably connected, and the drill bit is connected to the lower end of the outer cylinder; a cavity for containing a rock core is formed in the inner barrel, the lower end of the cavity is open, the open end of the cavity is a tapered cavity with a large upper end and a small lower end, the diameter of the large end of the tapered cavity is larger than that of the upper end of the cavity, a clasping ring is coaxially arranged in the tapered cavity, the outer peripheral wall of the clasping ring is also a conical surface and is matched with the cavity wall of the tapered cavity, and a plurality of annular convex edges are arranged on the inner peripheral wall of the clasping ring; the circular cutting device sets up the up end of drill bit with between the lower terminal surface of inner tube, the circular cutting device includes the circular cutting knife and is used for setting up the mount pad of circular cutting knife, the circular cutting knife with the mount pad is cyclic annular, the mount pad with urceolus fixed connection, the inner wall of mount pad is big-end-up's conical surface, the periphery wall of circular cutting knife also is the conical surface, with the inner wall adaptation of mount pad, the circular cutting knife includes rubber friction portion and sets up the cutting part of rubber friction portion lower extreme, the internal diameter of rubber friction portion is greater than the internal diameter of cutting part, the internal diameter of cutting part is greater than hold the internal diameter of ring tightly. It forms the ring grooving through the circular cutting device in advance at the lower extreme of core, has reduced the structural strength of core in circular cutting groove department, pulling force when having reduced the intercepting core, and the core is along the fracture of circular cutting groove, and the fracture is controllable, protects the integrality of core, prevents equipment damage simultaneously, has prolonged life.
Chinese patent publication No. CN214660036U discloses a coring bit, which includes a guide tube, a valve body, a spring, a support ring, a connecting tube and a bit; the support ring is arranged in the guide pipe and is in threaded connection with the guide pipe; the valve body comprises a main body and a flange piston circumferentially formed on the outer side surface of the top of the main body; the main body is axially provided with a first through hole; the spring is positioned in the guide pipe and sleeved on the main body; two ends of the spring are respectively connected with the flange piston and the support ring; a second through hole is formed in the side wall of the guide pipe; the second through hole is positioned above the support ring; the main body is slidably arranged in the support ring in a penetrating manner and used for driving the flange piston to move up and down the second through hole; the axial thread of the connecting pipe is arranged at the bottom of the guide pipe; the drill bit is arranged at the bottom of the connecting pipe; the coring bit further comprises a water diversion cap movably arranged inside the connecting pipe. The water diversion cap is adopted to protect the rock core from being directly washed by flushing fluid, and the rock core moves upwards along with the rock core under the action of buoyancy. Through the second through-hole, supply the flush fluid to discharge when first through-hole seals to cut off the washing out destruction effect of flush fluid to the rock core before carrying to bore, and form certain negative pressure in the connecting pipe, be favorable to preventing that the rock core from droing at the in-process of carrying to bore, improve the rock core and take the rate. Simultaneously, make each part of coring bit unpack apart more easily through connecting pipe and stand pipe threaded connection and support ring and stand pipe threaded connection, and then make the rock core take out more easily.
At present, due to the limitation of technical requirements, a water supply device is required to be arranged in the use of a core drill bit used in geological exploration, and cement slurry plays roles of cooling, lubricating and discharging powder in the drilling process, so that the smooth drilling is ensured, but due to the limitation of objective conditions, the core drilling can not be finished in a region without a water source; in addition, the existing core bit has the problem that the core is not easy to take out after the core is drilled and cored.
Disclosure of Invention
The invention provides a pneumatic gravel coring bit and a pneumatic gravel coring method, overcomes the defects of the prior art, can effectively solve the problem that the existing coring bit cannot carry out the coring operation without a water source, and can further solve the problem that the existing coring bit is difficult to take out a rock core after the completion of drilling and coring.
One of the technical schemes of the invention is realized by the following measures: a pneumatic gravel coring bit comprises an upper bit connector, an inner tube, an outer tube and a bit, wherein the upper bit connector comprises a first large-diameter part and a first small-diameter part which are sequentially and fixedly installed together from top to bottom, the outer diameter of the first large-diameter part is larger than that of the first small-diameter part, the outer side of the lower end of the first small-diameter part is fixedly provided with the inner tube, the inner tube comprises two detachable semi-closed tubes which are fixedly installed together, and the outer side of the lower end of the first large-diameter part is fixedly provided with the outer tube which is positioned on the outer side of the inner tube; the drill bit comprises a second large diameter part and a second small diameter part which are fixedly installed together from top to bottom in sequence, the inner diameter of the second large diameter part is larger than that of the second small diameter part, the outer side of the lower end of the inner pipe is fixedly installed with the inner side of the upper end of the second small diameter part, and the inner side of the lower end of the outer pipe is fixedly installed with the outer side of the upper end of the second large diameter part; an annular cavity is arranged between the outer pipe and the inner pipe, an installation blind hole with an upward opening is formed in the upper end of the drill bit upper joint, at least two upper air outlet holes capable of communicating the annular cavity with the installation blind hole are formed in the drill bit upper joint, and at least two lower air outlet holes capable of communicating with the annular cavity are formed in the outer side of the lower portion of the drill bit.
The following is a further optimization or/and improvement of one of the above-mentioned technical solutions of the invention:
the pneumatic impactor and the impactor joint can be further included, the impactor joint with the upper end located above the drill bit upper joint is fixedly installed in the installation blind hole, and the upper end of the impactor joint is installed in the pneumatic impactor.
The inner pipe can also comprise a fixing adhesive tape, at least two fixing ring grooves are arranged on the outer side of the inner pipe at intervals from top to bottom, and the fixing adhesive tape is wound in each fixing ring groove.
Eight upper air outlets can be uniformly distributed on the drill bit upper joint along the circumference at intervals, and eight lower air outlets are uniformly distributed on the outer side of the lower part of the drill bit along the circumference at intervals; each upper air outlet is inclined with a high inside and a low outside, and each lower air outlet is inclined with a high inside and a low outside.
The above-mentioned still can include the sealing washer, and the interval is equipped with at least one sealed annular from top to bottom between first minor diameter portion and the inner tube, all is equipped with the sealing washer in every sealed annular.
The drill bit further comprises a sealing gasket, a limiting ring table is arranged on the inner side of the lower end of the drill bit, and the sealing gasket is arranged on the inner side of the second small-diameter part corresponding to the position between the upper side of the limiting ring table and the lower end of the inner tube.
The inner pipe may further comprise an air blocking iron sheet, an air hole which is communicated with the inside and the outside is arranged on the outer side of the upper part of the inner pipe corresponding to the position below the first small diameter part, the air blocking iron sheet is arranged on the outer side of the inner pipe corresponding to the position of the air hole, and the inner side of the upper end of the air blocking iron sheet is fixed with the outer side of the inner pipe at a corresponding position.
The second technical scheme of the invention is realized by the following measures: a pneumatic gravel coring method using the pneumatic gravel coring bit comprises the following steps:
(1) connecting a pneumatic impactor with an upper joint of the drill bit through an impactor joint;
(2) the air flow generated by the air compressor drives the pneumatic impactor to act on the upper joint of the drill bit;
(3) the rock samples such as gravel and the like are crushed by the impact force generated by the pneumatic impactor, and the crushed rock samples such as gravel and the like enter the inner pipe to be gathered to form a rock core;
(4) the impact airflow sequentially enters the upper air outlet hole and the ring cavity along the mounting blind hole and is discharged from the lower air outlet hole to blow the bottom of the shaft;
(5) residual residues at the bottom of the well return to the ground along with airflow, so that the core taking operation without a water source is realized;
(6) two detachable half-closed pipes fixedly installed together are disassembled into two halves, so that the core in the inner pipe can be taken out quickly.
The pneumatic hammer drill bit has the advantages that the structure is reasonable and compact, the conception is ingenious, the pneumatic impactor is driven by the airflow generated by the air compressor to act on the upper joint of the drill bit, the impact force generated by the pneumatic impactor crushes rock samples such as gravels and the like, the rock samples enter the inner pipe and are gathered to form a rock core, the impact airflow sequentially enters the upper air outlet hole and the annular cavity along the installation blind hole and is discharged from the lower air outlet hole to be blown to the bottom of the well forcibly, and therefore residual residues at the bottom of the well return to the ground along with the airflow; through setting up two detachable fixed mounting's half-closed pipe together, take out the rock core from the inner tube after the coring operation of being convenient for, have reliable, stable and get effectual characteristics of core.
Drawings
FIG. 1 is a schematic sectional view of the preferred embodiment of the present invention.
Fig. 2 is an enlarged schematic view of fig. 1 at a.
Fig. 3 is an enlarged schematic view of fig. 1 at B.
The codes in the figures are respectively: 1 is first major diameter portion, 2 is first minor diameter portion, 3 is second major diameter portion, 4 is second minor diameter portion, 5 is the outer tube, 6 is the inner tube, 7 is the installation blind hole, 8 is last venthole, 9 is lower venthole, 10 is the annular cavity, 11 is pneumatic impactor, 12 is the impactor joint, 13 is the fixed sticky tape, 14 is the sealing washer, 15 is sealed the pad, 16 is the air blocking iron sheet, 17 is the air vent, 18 is spacing ring platform.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention.
In the present invention, for convenience of description, the description of the relative positional relationship of the components is described according to the layout pattern of fig. 1 of the specification, such as: the positional relationship of front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of fig. 1 of the specification.
The invention is further described with reference to the following examples and figures:
as shown in fig. 1, 2 and 3, the pneumatic gravel coring bit comprises an upper bit joint, an inner tube 6, an outer tube 5 and a bit, wherein the upper bit joint comprises a first large diameter part 1 and a first small diameter part 2 which are sequentially and fixedly installed together from top to bottom, the outer diameter of the first large diameter part 1 is larger than that of the first small diameter part 2, the inner tube 6 is fixedly installed on the outer side of the lower end of the first small diameter part 2, the inner tube 6 comprises two detachable semi-closed tubes which are fixedly installed together, and the outer tube 5 positioned on the outer side of the inner tube 6 is fixedly installed on the outer side of the lower end of the first large diameter part 1; the drill comprises a second large-diameter part 3 and a second small-diameter part 4 which are fixedly installed together from top to bottom in sequence, the inner diameter of the second large-diameter part 3 is larger than that of the second small-diameter part 4, the outer side of the lower end of an inner pipe 6 is fixedly installed with the inner side of the upper end of the second small-diameter part 4, and the inner side of the lower end of an outer pipe 5 is fixedly installed with the outer side of the upper end of the second large-diameter part 3; an annular cavity 10 is arranged between the outer tube 5 and the inner tube 6, an installation blind hole 7 with an upward opening is formed in the upper end of the drill bit upper joint, at least two upper air outlets 8 capable of communicating the annular cavity 10 with the installation blind hole 7 are formed in the drill bit upper joint, and at least two lower air outlets 9 capable of communicating with the annular cavity 10 are formed in the outer side of the lower portion of the drill bit. In the using process, the upper end of the pneumatic core drill bit is provided with a known pneumatic impact device, such as a pneumatic impact hammer, the pneumatic impact device is driven by airflow generated by an air compressor to act on an upper joint of the drill bit, rock samples such as gravels and the like are crushed by impact force generated by the pneumatic impact device, the rock samples enter an inner tube 6 and are gathered to form a rock core, the impact airflow sequentially enters an upper air outlet hole 8 and an annular cavity 10 along an installation blind hole 7 and is discharged from a lower air outlet hole 9 to blow a bottom hole forcibly, so that residual bottom hole residues are returned to the ground along with the airflow, and the problem that the existing core drill bit cannot perform core taking operation without a water source is effectively solved; through setting up two detachable fixed mounting half-closed pipes together, get out the core from inner tube 6 after getting the core operation, effectively solved current core bit and had the problem that is difficult for taking out the core after accomplishing the drilling and getting the core.
The pneumatic gravel core drill bit can be further optimized or/and improved according to actual needs:
as shown in the attached drawings 1, 2 and 3, the pneumatic percussion mechanism further comprises a pneumatic percussion mechanism 11 and a percussion mechanism joint 12, the percussion mechanism joint 12 with the upper end positioned above the drill bit upper joint is fixedly arranged in the mounting blind hole 7, and the upper end of the percussion mechanism joint 12 is arranged in the pneumatic percussion mechanism 11. In use, the pneumatic impactor 11 is arranged to be conveniently mounted with the bit upper connector.
As shown in the attached drawings 1, 2 and 3, the inner pipe comprises a fixing adhesive tape 13, at least two fixing ring grooves are arranged on the outer side of the inner pipe 6 at intervals from top to bottom, and the fixing adhesive tape 13 is wound in each fixing ring groove. In the use process, through the arrangement, the two half pipes can be conveniently and fixedly installed together in a detachable mode.
As shown in attached figures 1, 2 and 3, eight upper air outlets 8 are uniformly distributed on the upper joint of the drill bit at intervals along the circumference, and eight lower air outlets 9 are uniformly distributed on the outer side of the lower part of the drill bit at intervals along the circumference; each upper air outlet 8 is inclined with a high inside and a low outside, and each lower air outlet 9 is inclined with a high inside and a low outside. In the use process, the arrangement is convenient for enhancing the slag discharging effect of the invention.
As shown in fig. 1, 2 and 3, the sealing device further includes a sealing ring 14, at least one sealing ring groove is formed between the first small diameter portion 2 and the inner tube 6 at an interval from top to bottom, and a sealing ring 14 is arranged in each sealing ring groove. In the use, through setting up sealing washer 14, avoid compressed air to get into in the inner tube 6, influence the sediment effect.
As shown in fig. 1, 2 and 3, the drill bit further comprises a sealing gasket 15, a limit ring table 18 is arranged on the inner side of the lower end of the drill bit, and the sealing gasket 15 is arranged on the inner side of the second small diameter part 4 corresponding to the position between the upper side of the limit ring table 18 and the lower end of the inner tube 6. In the use, through setting up sealed 15, avoid compressed air to get into in the inner tube 6, influence the sediment effect.
As shown in fig. 1, 2 and 3, the air blocking device further comprises an air blocking sheet 16, an air vent 17 which is through inside and outside is arranged on the outer side of the upper portion of the inner tube 6 corresponding to the position below the first small diameter portion 2, the air blocking sheet 16 is arranged on the outer side of the inner tube 6 corresponding to the position of the air vent 17, and the inner side of the upper end of the air blocking sheet 16 is fixed with the outer side of the inner tube 6 together at a corresponding position. In the use process, the vent hole 17 is arranged to prevent the annular cavity 10 from being pressed back after the lower air outlet hole 9 is blocked; by arranging the air blocking iron sheet 16 to block the vent hole 17, after the annular cavity 10 is suppressed, air can only enter the vent hole 17 from a gap between the inner pipe 6 and the lower side of the air blocking iron sheet 16.
As shown in fig. 1, 2 and 3, the pneumatic gravel coring method using the pneumatic gravel coring bit comprises the following steps:
(1) connecting a pneumatic impactor 11 with an upper drill bit joint through an impactor joint 12;
(2) the air flow generated by the air compressor drives the pneumatic impactor 11 to act on the upper joint of the drill bit;
(3) rock samples such as gravels are crushed by impact force generated by the pneumatic impactor 11, and the crushed rock samples such as the gravels enter the inner pipe 6 to be gathered to form a rock core;
(4) the impact air flow sequentially enters the upper air outlet hole 8 and the annular cavity along the installation blind hole 7 and is discharged out of the forced blow shaft bottom from the lower air outlet hole 9;
(5) residual residues at the bottom of the well return to the ground along with airflow, so that the core taking operation without a water source is realized;
(6) two detachable half-closed pipes fixedly arranged together are disassembled into two halves, so that the core in the inner pipe 6 can be taken out quickly.
In the using process, the device and the method not only effectively solve the problem that the existing coring bit cannot carry out the core taking operation without water source, but also further solve the problem that the existing coring bit is difficult to take out the core after the core taking operation is finished.
The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect, and unnecessary technical features can be increased or decreased according to actual needs to meet the requirements of different situations.
Claims (10)
1. A pneumatic gravel coring bit is characterized by comprising an upper bit connector, an inner tube, an outer tube and a bit, wherein the upper bit connector comprises a first large-diameter part and a first small-diameter part which are sequentially and fixedly installed together from top to bottom, the outer diameter of the first large-diameter part is larger than that of the first small-diameter part, the inner tube is fixedly installed on the outer side of the lower end of the first small-diameter part, the inner tube comprises two detachable semi-closed tubes which are fixedly installed together, and the outer tube positioned on the outer side of the inner tube is fixedly installed on the outer side of the lower end of the first large-diameter part; the drill bit comprises a second large diameter part and a second small diameter part which are fixedly installed together from top to bottom in sequence, the inner diameter of the second large diameter part is larger than that of the second small diameter part, the outer side of the lower end of the inner pipe is fixedly installed with the inner side of the upper end of the second small diameter part, and the inner side of the lower end of the outer pipe is fixedly installed with the outer side of the upper end of the second large diameter part; an annular cavity is arranged between the outer pipe and the inner pipe, an installation blind hole with an upward opening is formed in the upper end of the drill bit upper joint, at least two upper air outlet holes capable of communicating the annular cavity with the installation blind hole are formed in the drill bit upper joint, and at least two lower air outlet holes capable of communicating with the annular cavity are formed in the outer side of the lower portion of the drill bit.
2. The pneumatic gravel core drill bit of claim 1, further comprising a pneumatic impactor and an impactor joint, wherein the impactor joint with the upper end positioned above the bit upper joint is fixedly arranged in the mounting blind hole, and the upper end of the impactor joint is arranged in the pneumatic impactor.
3. The pneumatic gravel core drill bit according to claim 1 or 2, further comprising a fixing adhesive tape, wherein at least two fixing ring grooves are arranged on the outer side of the inner pipe at intervals up and down, and the fixing adhesive tape is wound in each fixing ring groove.
4. The pneumatic gravel coring bit of claim 1 or 2, wherein eight upper air outlets are uniformly distributed on the upper joint of the bit at intervals along the circumference, and eight lower air outlets are uniformly distributed on the outer side of the lower part of the bit at intervals along the circumference; each upper air outlet is inclined with a high inside and a low outside, and each lower air outlet is inclined with a high inside and a low outside.
5. The pneumatic gravel coring bit of claim 3, wherein eight upper air outlets are circumferentially and uniformly distributed on the upper joint of the bit, and eight lower air outlets are circumferentially and uniformly distributed on the outer side of the lower part of the bit; each upper air outlet is inclined with a high inside and a low outside, and each lower air outlet is inclined with a high inside and a low outside.
6. The pneumatic gravel core bit of claim 1, 2 or 5, further comprising a sealing ring, wherein at least one sealing ring groove is arranged between the first small diameter part and the inner pipe at intervals up and down, and a sealing ring is arranged in each sealing ring groove.
7. The pneumatic gravel core bit of claim 3 or 4, further comprising a sealing ring, wherein at least one sealing ring groove is arranged between the first small diameter part and the inner pipe at intervals up and down, and a sealing ring is arranged in each sealing ring groove.
8. A pneumatic gravel coring bit according to claim 1, 2, 3, 4, 5, 6 or 7, further comprising a seal gasket, wherein a stop ring table is provided on the inner side of the lower end of the bit, and a seal gasket is provided on the inner side of the second small diameter portion corresponding to a position between the upper side of the stop ring table and the lower end of the inner tube.
9. The pneumatic gravel core drill bit according to claim 1, 2, 3, 4, 5, 6, 7 or 8, further comprising a gas blocking iron sheet, wherein the outer side of the upper part of the inner tube corresponding to the position below the first small diameter part is provided with a through air hole, the outer side of the inner tube corresponding to the position of the air hole is provided with the gas blocking iron sheet, and the inner side of the upper end of the gas blocking iron sheet is fixed with the corresponding position of the outer side of the inner tube.
10. A pneumatic gravel coring method of the pneumatic gravel coring bit of any one of claims 2 to 9, comprising the steps of:
(1) connecting a pneumatic impactor with an upper joint of the drill bit through an impactor joint;
(2) the air flow generated by the air compressor drives the pneumatic impactor to act on the upper joint of the drill bit;
(3) the rock samples such as gravel and the like are crushed by the impact force generated by the pneumatic impactor, and the crushed rock samples such as gravel and the like enter the inner pipe to be gathered to form a rock core;
(4) the impact airflow sequentially enters the upper air outlet hole and the ring cavity along the mounting blind hole and is discharged from the lower air outlet hole to blow the bottom of the shaft;
(5) residual residues at the bottom of the well return to the ground along with airflow, so that the core taking operation without a water source is realized;
(6) two detachable half-closed pipes fixedly installed together are disassembled into two halves, so that the core in the inner pipe can be taken out quickly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210069905.9A CN114541967A (en) | 2022-01-21 | 2022-01-21 | Pneumatic gravel coring bit and pneumatic gravel coring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210069905.9A CN114541967A (en) | 2022-01-21 | 2022-01-21 | Pneumatic gravel coring bit and pneumatic gravel coring method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114541967A true CN114541967A (en) | 2022-05-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210069905.9A Pending CN114541967A (en) | 2022-01-21 | 2022-01-21 | Pneumatic gravel coring bit and pneumatic gravel coring method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114541967A (en) |
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- 2022-01-21 CN CN202210069905.9A patent/CN114541967A/en active Pending
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