CN113445951B - Clear water drilling coring method suitable for argillized interlayer stratum - Google Patents
Clear water drilling coring method suitable for argillized interlayer stratum Download PDFInfo
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- CN113445951B CN113445951B CN202110969822.0A CN202110969822A CN113445951B CN 113445951 B CN113445951 B CN 113445951B CN 202110969822 A CN202110969822 A CN 202110969822A CN 113445951 B CN113445951 B CN 113445951B
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- 238000005553 drilling Methods 0.000 title claims abstract description 65
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000011229 interlayer Substances 0.000 title claims abstract description 24
- 239000011435 rock Substances 0.000 claims abstract description 15
- 238000005507 spraying Methods 0.000 claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 238000005096 rolling process Methods 0.000 claims description 10
- 239000004576 sand Substances 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 230000015572 biosynthetic process Effects 0.000 claims description 9
- 238000005755 formation reaction Methods 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 6
- 239000000956 alloy Substances 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 239000002002 slurry Substances 0.000 abstract description 3
- 238000011010 flushing procedure Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 239000000126 substance Substances 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
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
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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
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
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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
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
-
- 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
-
- 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
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
-
- 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
- E21B25/10—Formed core retaining or severing means
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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 discloses a clear water drilling coring method suitable for a argillized interlayer stratum, which comprises the following steps: firstly, a drilling tool is put into a hole, the drilling speed is kept to be 150-450r/min, the drilling pressure is kept to be 5-15KN, the pump capacity is kept to be 70-150L/min, when the footage of the drilling tool reaches the length of a core liner tube, the drilling is stopped, and the drilling tool is lifted out of the hole; secondly, disassembling the rock core in a manual coring mode or a hydraulic coring mode; the former is as follows: (1) disassembling a side-spraying PDC drill bit, a reamer and a first short circuit of an outer pipe together (2) disassembling a jump ring seat and an inner pipe together, manually drawing out a liner pipe after a liner pipe (3) is exposed, and taking out a rock core; the latter is: (1) the method comprises the steps of disassembling the side-spraying PDC drill bit (2), disassembling an outer pipe, disassembling a hydraulic core-withdrawing joint together with the inner pipe, a liner pipe and a clamp spring seat by a reamer (3), disassembling a clamp spring seat (4), connecting a water pipe with the hydraulic core-withdrawing joint, and withdrawing a core from the inner pipe by using water pressure. The invention can improve the core-taking rate of the argillization interlayer and meet the requirement of core-taking quality, and the aim that the core-taking rate reaches more than 95 percent is achieved on the premise of not protecting slurry.
Description
Technical Field
The invention relates to the technical field of hydraulic engineering exploration drilling tools, in particular to a clear water drilling coring method suitable for argillized interlayer strata.
Background
The argillization interlayer is an interlayer which is formed by dislocation and crushing of an original thin layer argilliferous rock stratum in the original rock and formation of a loose structure, weak connection among grains and complete argillization under the long-term physical and chemical action of underground water. The existence of the steel wire rope brings serious threat to the stability of various rock mass projects. Thus, argillized interlayers are one of the necessary items in significant hydroelectric surveys. As the drilling operation process of the water conservancy and hydropower industry does not allow the use of slurry with the core protection effect, only clear water is allowed to be used as a drilling flushing fluid, and the coring difficulty is increased.
The existing common argillization interlayer clear water drilling core drill bit is of a single-action double-pipe structure, the single-action structure adopts a multi-group thrust bearing combination mode, core pipe vibration, core deviation and wall leaning are easy to generate, the single action of the core pipe is reduced, the cores are oppositely ground, and the like; secondly, the inner pipe is in a half-closed pipe form, and flushing fluid in an annular gap between the inner pipe and the outer pipe easily enters the inside of the half-closed pipe along the gap between the half-closed pipes to flush rocks; thirdly, the bottom of the drilling tool is provided with a reamer, so that the drilling tool is in a single-point stress state at the bottom of the hole, and the drilling tool at the bottom of the hole is easy to vibrate; fourthly, the drill bit selected by the conventional single-action double-pipe drilling tool has the problems that flushing liquid flows out of the drill bit after passing through a clamp spring seat and is easy to erode to enter the drill bit or a argillized base rock core in front of the drill bit; fifthly, when the clean water is used as flushing liquid, the powder carrying capacity is weaker, and the accidents of drill burying and drill sticking are easily caused when a conventional drilling tool is used for drilling a rock core.
Disclosure of Invention
In order to solve the problems, the invention provides a clear water drilling and coring method suitable for a argillized interlayer stratum, which can specifically adopt the following technical scheme:
the invention relates to a clear water drilling coring method suitable for a argillized interlayer stratum, which comprises the following steps of:
step one, when the working condition of a argillization interlayer stratum is met, a drilling tool is put into a hole, the drilling speed is kept to be 150-450r/min, the drilling pressure is kept to be 5-15KN, the pump capacity is kept to be 70-150L/min, when the drilling tool reaches the length of a core liner, the drilling is stopped, and the drilling tool is lifted out of the hole;
the drilling tool comprises an open powder taking pipe, a drill rod joint, a sand setting sleeve, a four-purpose joint, an outer pipe, a reamer and a side-jet PDC drill bit which are sequentially connected, wherein the four-purpose joint is provided with an upper end inner cavity and a lower end inner cavity, a first water hole communicated with the sand setting sleeve and the outer pipe is formed in the bottom of the upper end inner cavity, a first one-way valve is arranged in the upper end inner cavity and connected with a filter core pipe positioned in the sand setting sleeve, a single-action pair is arranged in the lower end inner cavity, the other end of the single-action pair is connected with an adjusting assembly with a second water hole and a second one-way valve, the lower end of the adjusting assembly is connected with an inner pipe through a hydraulic core withdrawing joint, a liner pipe is arranged in the inner pipe, and a clamp spring seat connected with the side-jet PDC drill bit in a clamping mode is arranged at the lower end of the inner pipe;
secondly, detaching the core from the drilling tool in a manual coring mode or a hydraulic coring mode;
the manual coring method comprises the following steps: (1) disassembling a side-spraying PDC drill bit, a reamer and a first short circuit of an outer pipe together; (2) disassembling the clamp spring seat and the inner pipe together to expose the liner pipe; (3) manually drawing out the liner tube and taking out the core;
the hydraulic coring method comprises the following steps: (1) disassembling the side-spraying PDC drill bit; (2) disassembling the outer pipe and the reamer; (3) the hydraulic core-withdrawing joint, the inner pipe, the liner pipe and the clamp spring seat are disassembled together; (4) disassembling the clamp spring seat; (5) the water pipe is connected with the hydraulic core withdrawing joint, and the core is withdrawn from the inner pipe by using the water pressure.
And a plurality of longitudinally arranged hard alloy strips are embedded and welded on the outer wall of the four-way joint, and the maximum outer diameter of each hard alloy strip is consistent with that of the reamer.
The single action pair comprises a mandrel and a rotating assembly connected with the mandrel, the rotating assembly is symmetrically arranged at two ends of the mandrel, each rotating assembly comprises a sleeve used for connecting a lower end inner cavity of a four-purpose joint or the upper end of an adjusting assembly, the sleeve is arranged on the mandrel in a penetrating mode, a rolling bearing and a pressure bearing are arranged between the sleeve and the mandrel, an oil filling hole between the rolling bearing and the pressure bearing is formed in the sleeve, one end, close to the rolling bearing, of the sleeve is fixed through a nut, and one end, close to the pressure bearing, of the sleeve is fixed through an end cover.
The adjusting assembly comprises an adjusting bolt, a threaded inner cavity used for connecting a single acting pair is formed in the upper end of the adjusting bolt, a vertical cavity with a downward opening is formed in the lower end of the adjusting bolt, the vertical cavity and the horizontal cavity are formed in the middle of the adjusting bolt, the second water hole is communicated, the second one-way valve is installed on the inner side of the vertical cavity, and a threaded joint and a threaded positioning piece are sleeved on the outer side of the vertical cavity.
The outer pipe is formed by connecting a first main pipe and a first short joint in a threaded manner.
The inner pipe is formed by connecting a second main pipe with a second short joint in a threaded manner.
The liner tube is a semi-closed tube connected through snap fasteners.
The side-spraying PDC drill bit comprises a reducing steel pipe, a third water hole is formed in the reducing position of the reducing steel pipe in the vertical direction, and a PDC composite sheet is arranged at the front end of the reducing steel pipe and close to the third water hole.
The clear water drilling coring method suitable for the argillized interlayer stratum provided by the invention uses the specially designed drilling tool, can improve the argillized interlayer coring rate and meet the coring quality requirement in the argillized interlayer stratum drilling construction, and realizes the aim of adopting the core rate of more than 95% on the premise of not protecting slurry. Compared with the prior art, it has following advantage:
1) Due to the combined design of the open type powder taking pipe and the sand setting pipe, the probability of the problems of drill burying and drill clamping caused by insufficient powder carrying capacity of clear water in the drilling process can be effectively reduced;
2) The side-jetting PDC drill bit is designed, so that the scouring of clear water to a rock core is remarkably reduced, and the side-jetting PDC drill bit can be applied to a argillization interlayer stratum and other weak and easily-eroded strata;
3) The four-purpose catcher of the reaming structure is arranged at the upper end of the drilling tool and is used in combination with the reamer at the lower end of the drilling tool, so that the stress structure of the drilling tool in the hole is changed, and the stability and the pilot performance of the drilling tool are improved;
4) The core inner tube and the single-acting mechanism have the advantages that the core inner tube and the single-acting mechanism are in the same core degree and single-acting performance are improved by adopting the single-acting structure consisting of the thrust bearing and the rolling bearing;
5) The drilling tool adopts a three-layer tube structure consisting of an outer tube, an inner tube and a liner tube, wherein the inner tube adopts a full tube structure, so that the erosion effect of flushing fluid in an annular gap between the inner tube and the outer tube on a rock core in a conventional single-action double-tube structure (the inner tube is a half-closed tube mechanism) can be effectively avoided; meanwhile, the lower ends of the outer pipe and the inner pipe of the drilling tool are respectively provided with a short circuit, so that a mechanical core discharging mode can be adopted, the working procedure of disassembling a core is reduced, and the construction efficiency is improved;
6) The upper rock stratum and the lower rock stratum of the argillization interlayer rock core have certain strength, and the mode that the clamp spring is clamped to break the rock core is selected, so that the argillization interlayer can be protected.
Drawings
Fig. 1 is a schematic view of the structure of the drilling tool of the present invention.
Fig. 2 is a schematic structural view of the four-way joint of fig. 1.
Fig. 3 is a schematic structural view of the single acting pair in fig. 1.
Fig. 4 is a schematic view of the structure of the adjustment assembly of fig. 1.
FIG. 5 is a schematic structural diagram of the side-jet PDC bit of FIG. 1.
Fig. 6 is a schematic view of the structure of the tube of fig. 1.
Fig. 7 is a schematic view of the structure of the inner tube of fig. 1.
Figure 8 is a schematic view of the liner of figure 1.
Detailed Description
The following describes embodiments of the present invention in detail with reference to the accompanying drawings, which are implemented on the premise of the technical solution of the present invention, and give detailed implementation manners and specific construction processes, but the scope of the present invention is not limited to the following embodiments.
As shown in fig. 1-8, the method for coring in clear water suitable for argillaceous interbedded formations of the present invention comprises the following steps:
step one, when the working condition of a argillization interlayer stratum is met, a drilling tool is put into a hole, the drilling speed is kept to be 150-450r/min, the drilling pressure is kept to be 5-15KN, the pump capacity is kept to be 70-150L/min, when the drilling tool reaches the length of a core liner, the drilling is stopped, and the drilling tool is lifted out of the hole;
the drilling tool comprises an open powder taking pipe 1, a drill rod joint 2, a sand setting casing pipe 3, a four-purpose joint 4, an outer pipe 5, a reamer 6 and a side-spraying PDC drill bit 7 which are sequentially connected in a threaded manner, wherein the four-purpose joint 4 is provided with an upper end inner cavity and a lower end inner cavity, a first water hole 401 communicated with the sand setting casing pipe 3 and the outer pipe 5 is formed in the bottom of the upper end inner cavity, a first check valve 402 is installed in the upper end inner cavity, the first check valve 402 is connected with a filter core pipe 403 located in the sand setting casing pipe 3, a single-action pair 8 is connected in the lower end inner cavity in a threaded manner, an adjusting component 9, a hydraulic core withdrawing joint 10 and an inner pipe 11 are sequentially connected in a threaded manner to the other end of the single-action pair 8, a liner pipe 12 is sleeved in the inner pipe 11, and a clamp spring seat 13 connected with the side-spraying PDC drill bit in a clamped manner is connected to the lower end of the inner pipe 11.
A plurality of longitudinally arranged cemented carbide strips 404 are bonded to the outer wall of the four-way joint 4, and the maximum outer diameter of the cemented carbide strips 404 coincides with the maximum outer diameter of the reamer 6.
The single-acting pair 8 comprises a mandrel 801 and two rotating assemblies connected with the mandrel 801, the rotating assemblies are symmetrically arranged at two ends of the mandrel 801, each rotating assembly comprises a sleeve 802 which is screwed in an inner cavity at the lower end of the four-way joint 4 or an inner cavity at the upper end of the adjusting assembly 9, the sleeve 802 penetrates through the mandrel 801, a rolling bearing 803 and a pressure bearing 804 are arranged between the sleeve 802 and the mandrel 801, an oil filling hole 805 which is located between the rolling bearing 803 and the pressure bearing 804 is formed in the sleeve 802, one end, close to the rolling bearing 803, of the sleeve 802 is fixed through a nut 806 and a gasket 807, one end, close to the pressure bearing 804, of the sleeve 802 is fixed through an end cover 808, and an oil seal 809 is arranged between the end cover 808 and the mandrel 801.
The adjusting assembly 9 comprises an adjusting bolt 901, a thread inner cavity used for connecting the single acting pair 8 is formed in the upper end of the adjusting bolt 901, a vertical cavity with a downward opening is formed in the lower end of the adjusting bolt 901, the vertical cavity is communicated with a second water hole 902 formed in the middle of the adjusting bolt 901 in a horizontal mode, a second one-way valve 903 is installed on the inner side of the vertical cavity, and a threaded connector 904 and a thread positioning piece 905 are sleeved on the outer side of the vertical cavity.
The outer pipe 5 is formed by screwing a first main pipe 501 and a first short joint 502; the inner pipe 11 is formed by screwing a second main pipe 111 and a second short joint 112; liner 12 is a semi-closed tube connected by snap fasteners.
The side-spraying PDC drill bit 7 comprises a reducing steel pipe 701, a third water hole 702 is formed in the reducing position of the reducing steel pipe 701 in the vertical direction, and a plurality of PDC composite sheets 703 are uniformly embedded at the front end of the reducing steel pipe 701 and the position close to the third water hole 702.
Secondly, disassembling the core from the drilling tool in a manual core taking mode or a hydraulic core taking mode:
the manual coring method comprises the following steps: (1) disassembling the side-jetting PDC drill bit 7, the reamer 6 and the first short joint 502 of the outer pipe 5; (2) disassembling the clamp spring seat 13 and the inner pipe 11 together to expose the liner pipe 12; (3) the liner 12 is manually withdrawn and the core removed.
The hydraulic coring method comprises the following steps: (1) disassembling the side-spraying PDC drill bit 7; (2) the outer pipe 5 and the reamer 6 are disassembled; (3) the hydraulic core-removing joint 10, the inner pipe 11, the liner pipe 12 and the clamp spring seat 13 are detached together; (4) disassembling the clamp spring seat 13; (5) the water pipe is connected with a hydraulic core withdrawing joint 10, and the core is withdrawn from the inner pipe 11 by using the water pressure.
It should be noted that in the description of the present invention, terms of orientation or positional relationship such as "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Claims (8)
1. A clear water drilling coring method suitable for argillization interlayer stratum is characterized by comprising the following steps: the method comprises the following steps:
step one, when the working condition of a argillization interlayer stratum is met, a drilling tool is put into a hole, the drilling speed is kept to be 150-450r/min, the drilling pressure is kept to be 5-15KN, the pump capacity is kept to be 70-150L/min, when the drilling tool reaches the length of a core liner, the drilling is stopped, and the drilling tool is lifted out of the hole;
the drilling tool comprises an open powder taking pipe, a drill rod joint, a sand setting sleeve, a four-purpose joint, an outer pipe, a reamer and a side-jet PDC drill bit which are sequentially connected, wherein the four-purpose joint is provided with an upper end inner cavity and a lower end inner cavity, a first water hole communicated with the sand setting sleeve and the outer pipe is formed in the bottom of the upper end inner cavity, a first one-way valve is arranged in the upper end inner cavity and connected with a filter core pipe positioned in the sand setting sleeve, a single-action pair is arranged in the lower end inner cavity, the other end of the single-action pair is connected with an adjusting assembly with a second water hole and a second one-way valve, the lower end of the adjusting assembly is connected with an inner pipe through a hydraulic core withdrawing joint, a liner pipe is arranged in the inner pipe, and a clamp spring seat connected with the side-jet PDC drill bit in a clamping mode is arranged at the lower end of the inner pipe;
secondly, detaching the rock core from the drilling tool in a manual coring mode or a hydraulic coring mode;
the manual coring method comprises the following steps: (1) disassembling a side-spraying PDC drill bit, a reamer and a first short circuit of an outer pipe together; (2) disassembling the clamp spring seat and the inner pipe together to expose the liner pipe; (3) manually drawing out the liner tube and taking out the core;
the hydraulic coring method comprises the following steps: (1) disassembling the side-spraying PDC drill bit; (2) disassembling the outer pipe and the reamer; (3) the hydraulic core-withdrawing joint, the inner pipe, the liner pipe and the clamp spring seat are disassembled together; (4) disassembling the clamp spring seat; (5) the water pipe is connected with the hydraulic core withdrawing joint, and the core is withdrawn from the inner pipe by using water pressure.
2. The method for coring in a muddy interlayer formation by drilling with clean water as claimed in claim 1, wherein: and a plurality of longitudinally arranged hard alloy strips are embedded and welded on the outer wall of the four-way joint, and the maximum outer diameter of each hard alloy strip is consistent with that of the reamer.
3. The clean water drilling and coring method suitable for argillaceous interbedded formations according to claim 1, wherein: the single action pair comprises a mandrel and a rotating assembly connected with the mandrel, the rotating assembly is symmetrically arranged at two ends of the mandrel, each rotating assembly comprises a sleeve used for connecting a lower end inner cavity of a four-purpose joint or the upper end of an adjusting assembly, the sleeve is arranged on the mandrel in a penetrating mode, a rolling bearing and a pressure bearing are arranged between the sleeve and the mandrel, an oil filling hole between the rolling bearing and the pressure bearing is formed in the sleeve, one end, close to the rolling bearing, of the sleeve is fixed through a nut, and one end, close to the pressure bearing, of the sleeve is fixed through an end cover.
4. The clean water drilling and coring method suitable for argillaceous interbedded formations according to claim 1, wherein: the adjusting assembly comprises an adjusting bolt, a threaded inner cavity used for connecting a single acting pair is formed in the upper end of the adjusting bolt, a vertical cavity with a downward opening is formed in the lower end of the adjusting bolt, the vertical cavity and the horizontal cavity are formed in the middle of the adjusting bolt, the second water hole is communicated, the second one-way valve is installed on the inner side of the vertical cavity, and a threaded joint and a threaded positioning piece are sleeved on the outer side of the vertical cavity.
5. The method for coring in a muddy interlayer formation by drilling with clean water as claimed in claim 1, wherein: the outer pipe is formed by connecting a first main pipe and a first short joint in a threaded manner.
6. The clean water drilling and coring method suitable for argillaceous interbedded formations according to claim 1, wherein: the inner pipe is formed by connecting a second main pipe with a second short joint in a threaded manner.
7. The clean water drilling and coring method suitable for argillaceous interbedded formations according to claim 6, wherein: the liner tube is a semi-closed tube connected through snap fasteners.
8. The method for coring in a muddy interlayer formation by drilling with clean water as claimed in claim 1, wherein: the side-spraying PDC drill bit comprises a reducing steel pipe, a third water hole is formed in the reducing position of the reducing steel pipe in the vertical direction, and a PDC composite sheet is arranged at the front end of the reducing steel pipe and close to the third water hole.
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| CN202110969822.0A CN113445951B (en) | 2021-08-23 | 2021-08-23 | Clear water drilling coring method suitable for argillized interlayer stratum |
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| CN202110969822.0A CN113445951B (en) | 2021-08-23 | 2021-08-23 | Clear water drilling coring method suitable for argillized interlayer stratum |
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| CN114562226B (en) * | 2022-02-28 | 2024-03-12 | 中国铁建重工集团股份有限公司 | Coring inner tube |
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2021
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| JPH11256974A (en) * | 1998-03-09 | 1999-09-21 | Nlc:Kk | Core barrel for extracting rock-core, drill rod and swivel joint |
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| CN203145879U (en) * | 2013-03-07 | 2013-08-21 | 中国地质科学院探矿工艺研究所 | Combined core drilling tool for improving core drilling effect of broken stratum |
| CN104295232A (en) * | 2014-10-26 | 2015-01-21 | 江苏省南京工程高等职业学校 | Single-action double-pipe coring overburden drill tool for air down-the-hole hammer |
| CN204476329U (en) * | 2015-02-02 | 2015-07-15 | 陕西铁道工程勘察有限公司 | A kind of basement rock triple pipe core bit |
| CN205936410U (en) * | 2016-08-23 | 2017-02-08 | 唐山市金石超硬材料有限公司 | Doublestage single action three -layer pipe diamond drill |
| CN207829835U (en) * | 2018-01-22 | 2018-09-07 | 河北省地矿局第七地质大队 | The triple moving coupling-pipe drilling tools of 91 single actions |
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