CN219509608U - Rope coring three-layer pipe drilling tool suitable for loose complex stratum - Google Patents
Rope coring three-layer pipe drilling tool suitable for loose complex stratum Download PDFInfo
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- CN219509608U CN219509608U CN202320983079.9U CN202320983079U CN219509608U CN 219509608 U CN219509608 U CN 219509608U CN 202320983079 U CN202320983079 U CN 202320983079U CN 219509608 U CN219509608 U CN 219509608U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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Abstract
The utility model provides a rope coring three-layer pipe drilling tool suitable for loose and complex strata, which is used after the upper end of the rope coring drilling tool is connected with a rope coring drill rod of a drilling machine, and comprises a drilling pipe and a sampling inner pipe, wherein the upper end of the drilling pipe is coaxially connected with the rope coring drill rod; the sampling inner tube comprises a spearhead, a spring clip, a first hollow joint, a water pipe fitting, a second hollow joint, a single-action joint and a core pipe fitting which are sequentially connected from top to bottom; the core pipe fitting is rotationally connected with the second hollow joint through the single-acting joint; the outer diameters of the water pipe fitting, the second hollow joint, the single-action joint and the core pipe fitting are smaller than the inner diameter of the seat ring. The drilling tool solves the problems that when the existing rope core drilling tool drills into an earth surface unconsolidated formation, the water path structure of the existing rope core drilling tool easily causes the core to be continuously flushed in the drilling process, so that unconsolidated sand in the formation is dispersed and discharged, the obtained core is poor in undisturbed and insufficient in sampling rate, the existing core extracting and core drilling tool is good in core extracting effect, but low in operation efficiency and the like.
Description
Technical Field
The utility model relates to the technical field of rope coring drilling tools, in particular to a rope coring three-layer pipe drilling tool suitable for loose and complex strata.
Background
Drilling and coring difficulties in unconsolidated formations are one of the difficulties in the drilling industry. The current common drilling and coring methods include rope coring drilling technology and lifting and coring drilling technology. The two methods are matched with different core drilling tools. When the rope coring drilling technology is used, all drill rods are not lifted after drilling is finished, and a core can be obtained by only taking out a winch steel wire rope with a fisher for the core tube in the bottom drilling tool of the drill string, so that the drilling and coring efficiency is higher, but the core is poor in undisturbed and the core taking rate is lower when the loose stratum is drilled and cored. When the core-extracting drilling technology is used, after the drilling is finished, the drill rod is required to be completely extracted out of the hole, and the drill tool at the bottommost end of the drill rod string is lifted to the ground surface and opened to obtain the core, so that the core-extracting effect is good but the efficiency is low.
When the existing rope core drilling tool drills into an earth surface unconsolidated formation, the water path structure of the existing rope core drilling tool easily causes the core to be continuously washed in the drilling process, so that unconsolidated sand in the formation is scattered and discharged, and the problems of poor undisturbed obtained core, insufficient sampling rate and the like exist. The existing core drilling tool for extracting the drill has good core drilling effect, but has the problems of low operation efficiency and the like.
Disclosure of Invention
The utility model aims to provide a rope core three-layer pipe drilling tool suitable for loose and complex strata, which solves the problems that when the traditional rope core drilling tool drills into the loose strata on the earth surface, the water path structure of the traditional rope core drilling tool easily causes the continuous flushing of a rock core in the drilling process, loose sand in the strata is dispersed and discharged, so that the obtained rock core is poor in undisturbed and insufficient in sampling rate, and the traditional core extracting and drilling tool has good core extracting effect but low operation efficiency.
The embodiment of the utility model is realized by the following technical scheme: the rope coring three-layer pipe drilling tool suitable for loose and complex stratum is characterized by comprising a drilling pipe and a sampling inner pipe, wherein the upper end of the drilling pipe is connected with a rope coring drill rod of a drilling machine and then used, the upper end of the drilling pipe is coaxially connected with the rope coring drill rod, and the sampling inner pipe is coaxially arranged in the drilling pipe;
the sampling inner pipe comprises a spearhead, a spring clip, a first hollow joint, a water pipe fitting, a second hollow joint, a single-action joint and a core pipe fitting which are sequentially connected from top to bottom; the core pipe fitting is rotationally connected with the second hollow joint through the single-acting joint;
the inner wall of the drilling pipe is provided with an annular step groove, and the spring clip can be abutted with the top end of the step groove after being opened; a seat ring is integrally arranged in the drilling pipe and positioned below the step groove, and the bottom of the first hollow joint is abutted with the top of the seat ring;
the water pipe fitting is used for precipitating partial fixed impurities in drilling fluid; the outer diameters of the water pipe fitting, the second hollow joint, the single-action joint and the core pipe fitting are smaller than the inner diameter of the seat ring.
Further, the device further comprises a connecting pipe, the spearhead is embedded in the upper section of the connecting pipe, the spring clip is arranged in the middle section of the connecting pipe, a plurality of first through holes are formed in the lower section of the connecting pipe in a surrounding mode, and the lower end of the connecting pipe is communicated with the first hollow joint.
Further, the water pipe piece comprises an outer water pipe and an inner water pipe, the upper end of the outer water pipe is communicated with the first hollow joint, and the lower end of the outer water pipe is in threaded connection with the second hollow joint;
the inner water pipe and the outer water pipe are coaxially arranged, and an annular sedimentation cavity is reserved between the inner water pipe and the outer water pipe; the upper end of the inner water pipe is sealed, a plurality of second through holes are formed around the upper end of the inner water pipe, and the lower end of the inner water pipe is communicated with the inner cavity of the second hollow joint;
the second hollow joint is communicated with the single-acting joint through a short pipe, and a plurality of third through holes are formed in the short pipe in a surrounding mode.
Further, the single-acting joint comprises a connecting shaft, a first pushing bearing, a sliding sleeve, a second pushing bearing and a nut, wherein the axis of the connecting shaft is hollow, the upper end of the connecting shaft is communicated with the short pipe, and the lower end of the connecting shaft is communicated with the core pipe fitting;
the middle part of the connecting shaft is integrally provided with an outer baffle ring, the part of the connecting shaft below the outer baffle ring is sequentially sleeved with the first pushing bearing, the sliding sleeve and the second pushing bearing from top to bottom, and the lower end of the connecting shaft is in threaded connection with the nut;
the sliding sleeve is in clearance fit with the connecting shaft, and the sliding sleeve is connected with the core pipe fitting.
Further, the core pipe fitting comprises an inner core pipe and an outer core pipe, the inner core pipe is coaxially arranged inside the outer core pipe, the inner core pipe is in clearance fit with the outer core pipe, and the inner core pipe and the outer core pipe are in threaded connection with the sliding sleeve.
Further, the drilling pipe comprises a spring blocking head, a drilling outer pipe, a reamer and a drill bit which are sequentially connected from top to bottom;
the stepped groove and the seat ring are both located in the drilling outer tube.
Further, the inner diameter of the drill bit is the same as the inner diameter of the inner core tube.
Further, the inner core tube is formed by splicing two semi-closed tubes, and the two semi-closed tubes are symmetrical relative to the axis of the inner core tube.
The technical scheme of the embodiment of the utility model has at least the following advantages and beneficial effects:
1. during drilling and sampling, the upper side and the lower side of the sliding sleeve are respectively connected with the connecting shaft in a rotating manner through the first pushing bearing and the second pushing bearing, meanwhile, the core pipe fitting is in threaded connection with the sliding sleeve, and then the core pipe fitting can be kept relatively static with the core when the connecting shaft rotates along with the short pipe above, the second hollow joint, the water pipe fitting, the first hollow joint, the spring clamp, the spearhead and the drilling pipe, so that the core pipe fitting can be prevented from relatively rotating with the core, damage to the core of loose geology is avoided, and further, a good sampling effect can be achieved on the loose and complex geology.
2. The inner core tube is formed by splicing the two semi-closed tubes, the two semi-closed tubes are symmetrical about the axis of the inner core tube, and when a sample collected by the core tube is extracted, the two semi-closed tubes are taken out of the outer core tube only, the two semi-closed tubes are relatively disassembled, and an inner core is collected, so that extrusion and damage to the sampled core are avoided to the greatest extent.
3. After the core pipe fitting is filled with core samples, the core pipe fitting is put into the core drill rod from the rope through the fisher and is connected with the fisher spearhead in a self-locking manner, the spring clamp is contracted in the process of lifting the fisher spearhead upwards, the core pipe fitting is separated from the step groove, the whole sampling inner pipe is taken out, core sampling is finally achieved, the sampling speed is high, the efficiency is high, the samples are complete, and the sampling effect is good.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of the internal structure of a rope cored three-layer pipe drilling tool for loose and complex strata provided by the utility model;
FIG. 2 is an enlarged schematic view of the structure A in FIG. 1;
FIG. 3 is an enlarged schematic view of the structure at B in FIG. 1;
FIG. 4 is a schematic view of the inner core tube of the rope cored three-layer tube drilling tool for loose and complex strata;
icon: 1. drilling pipe, 11, step groove, 12, spring clip stop, 13, drilling outer pipe, 14, reamer, 15, drill bit, 16, seat ring, 2, fishing spear, 3, spring clip, 4, first hollow joint, 5, water pipe piece, 51, outer water pipe, 52, inner water pipe, 521, second through hole, 53, sedimentation chamber, 6, second hollow joint, 7, single action joint, 71, connecting shaft, 72, first push bearing, 73, sliding sleeve, 74, second push bearing, 75, nut, 76, outer stop ring, 8, core pipe, 81, inner core pipe, 811, semi-closed pipe, 82, outer core pipe, 9, connecting pipe, 91, first through hole, 10, short pipe, 101, third through hole.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1 to 4, the present embodiment provides a rope coring three-layer pipe drilling tool suitable for loose and complex strata, the upper end of which is connected with a rope coring drill rod of a drilling machine for use, and the rope coring three-layer pipe drilling tool comprises a drilling pipe 1 and a sampling inner pipe, the upper end of the drilling pipe 1 is coaxially connected with the rope coring drill rod, and further the drilling pipe 1 rotates along with the rope coring drill rod of the drilling machine, and the sampling inner pipe is coaxially arranged in the drilling pipe 1; the drilling pipe 1 comprises a spring blocking head 12, a drilling outer pipe 13, a reamer 14 and a drill bit 15 which are sequentially connected from top to bottom; during concrete implementation, the upper end of the spring blocking head 12 is connected with a rope coring drill rod, the lower end of the spring blocking head 12 is in threaded connection with a drilling outer pipe 13, the drilling outer pipe 13 is in threaded connection with a reamer 14, the reamer 14 is used for enlarging drilling holes, the whole drilling fluid is convenient to flow in and out, the drill bit 15 is in threaded connection with the lower end of the reamer 14, the drill bit 15 is hollow, the drill bit 15 is used for annular drilling, and core soil samples entering the drill bit 15 are collected.
1-3, the sampling inner tube comprises a spearhead 2, a spring clip 3, a first hollow joint 4, a water pipe fitting 5, a second hollow joint 6, a single-action joint 7 and a core pipe fitting 8 which are sequentially connected from top to bottom; the core pipe fitting 8 is rotationally connected with the second hollow joint 6 through the single-action joint 7, and the core pipe fitting 8 is used for collecting a sampling core; furthermore, the spearhead 2, the bullet clamp 3, the first hollow joint 4, the water pipe fitting 5 and the second hollow joint 6 rotate along with the drilling pipe 1, the core pipe fitting 8 is kept static with the core through the single-action joint 7, and further the core can be better collected, the core of a loose and complex stratum can be sampled, the state of the core can be kept stable to the greatest extent, and the sampling effect is good.
As shown in fig. 1, the inner wall of the drilling pipe 1 is provided with an annular step groove 11, the step groove 11 and a seat ring 16 are both positioned in the drilling outer pipe 13, and the spring clip 3 can be abutted with the top end of the step groove 11 after being opened; a seat ring 16 is integrally arranged below the step groove 11 in the drilling pipe 1, and the bottom of the first hollow joint 4 is abutted with the top of the seat ring 16; when drilling and sampling are carried out, the drilling pipe 1 is abutted with the spring clamp 3 through the step groove, the whole sampling inner pipe is driven to move, and then final transmission acts on the core pipe fitting 8, so that the core pipe fitting 8 synchronously advances along with the drilling pipe 1, and core sampling is achieved; simultaneously, the bottom of the first hollow joint 4 is abutted with the seat ring 16, so that the whole sampling inner pipe can be prevented from penetrating out of the drilling pipe 1, and further the position limitation of the whole sampling inner pipe is realized.
More specifically, the water pipe fitting 5 is used for partially fixing impurities in the precipitation drilling fluid; the outer diameters of the water pipe fitting 5, the second hollow joint 6, the single-action joint 7 and the core pipe fitting 8 are smaller than the inner diameter of the seat ring 16.
When the core pipe fitting 8 is filled with core samples, the core pipe fitting 8 is put into the core drilling rod through the fisher and is connected with the spearhead 2 in a self-locking manner, the spearhead 2 is retracted in the lifting process, the spring clamp 3 is separated from the step groove 11, the whole sampling inner pipe is taken out, core sampling is finally achieved, the sampling speed is high, the efficiency is high, the samples are complete, and the sampling effect is good.
As shown in fig. 1, the fishing spearhead 2 is embedded in the upper section of the connecting pipe 9, the spring clip 3 is arranged in the middle section of the connecting pipe 9, a vertical hole is formed in the middle section of the rock connecting pipe 9, the spring clip 3 can be conveniently opened and closed, a plurality of first through holes 91 are formed in the lower section of the connecting pipe 9 in a surrounding mode, and the lower end of the connecting pipe 9 is communicated with the first hollow joint 4.
As shown in fig. 1-3, the water pipe fitting 5 comprises an outer water pipe 51 and an inner water pipe 52, the upper end of the outer water pipe 51 is communicated with the first hollow joint 4, and the lower end of the outer water pipe 51 is in threaded connection with the second hollow joint 6;
the inner water pipe 52 and the outer water pipe 51 are coaxially arranged, and an annular sedimentation cavity 53 is reserved between the inner water pipe 52 and the outer water pipe 51; the upper end of the inner water pipe 52 is sealed, a plurality of second through holes 521 are formed around the upper end of the inner water pipe 52, and the lower end of the inner water pipe 52 is communicated with the inner cavity of the second hollow joint 6;
the second hollow joint 6 is communicated with the single-acting joint 7 through a short pipe 10, and a plurality of third through holes 101 are formed in the short pipe 10 in a surrounding mode.
In particular, during drilling, as indicated by the small arrows in fig. 1, the drilling fluid flows from the inside of the rope coring rod 1 into the snap-in head 12 and then into the drilling outer tube 13, and further, the drilling fluid flows from the first through hole 91 of the connecting tube 9 into the connecting tube 9 and then into the outer tube 51 through the first hollow joint 4, after the outer tube 51 is filled, the drilling fluid flows from the second through hole 521 on the inner tube 52 into the cavity of the inner tube 52, part of the solid impurities in the drilling fluid are deposited in the deposition cavity 53 between the outer tube 51 and the inner tube 52, the drilling fluid flows from the inner tube 52 into the short tube 10 through the second hollow joint 6, flows from the third through hole 101 on the short tube 10 into the cavity between the single-action joint 7 and the drilling outer tube 13, flows from the space between the core tube 8 and the drilling tube 1 to the drill bit 15, and then flows from the inner cavity of the drill bit 15 back to the ground from the outside of the drill bit 15.
As shown in fig. 1 and 3, the single-acting joint 7 comprises a connecting shaft 71, a first pushing bearing 72, a sliding sleeve 73, a second pushing bearing 74 and a nut 75, wherein the axis of the connecting shaft 71 is hollow, the upper end of the connecting shaft 71 is communicated with the short pipe 10, and the lower end of the connecting shaft 71 is communicated with the core pipe fitting 8;
in specific implementation, an outer baffle ring 76 is integrally arranged in the middle of the connecting shaft 71, a first pushing bearing 72, a sliding sleeve 73 and a second pushing bearing 74 are sleeved on the part of the connecting shaft 71 below the outer baffle ring 76 from top to bottom in sequence, and a nut 75 is connected to the lower end of the connecting shaft 71 through threads; washers are sandwiched between the first push bearing 72 and the outer retainer 76 and the sliding sleeve 73, and washers are sandwiched between the second push bearing 74 and the sliding sleeve 73 and the nut 75.
More specifically, the sliding sleeve 73 is in clearance fit with the connecting shaft 71, and the sliding sleeve 73 is connected with the core pipe fitting 8. And then the upper and lower both sides of sliding sleeve 73 are connected with connecting axle 71 through first incremental launching bearing 72 and second incremental launching bearing 74 rotation respectively, and simultaneously rock core pipe fitting 8 and sliding sleeve 73 threaded connection, and then rock core pipe fitting 8 is at connecting axle 71 along with the nozzle stub 10 of top, second hollow joint 6, water pipe fitting 5, first hollow joint 4, bullet card 3, drag for spearhead 2 and when drilling pipe 1 rotates, rock core pipe fitting 8 can keep relative static with the rock core, and then avoid producing relative rotation with the rock core, avoid producing the destruction to the rock core of loose geology, and then to loose complex geology, can have better sample effect.
More specifically, as shown in fig. 1-4, the core pipe 8 includes an inner core pipe 81 and an outer core pipe 82, the inner core pipe 81 is coaxially disposed inside the outer core pipe 82, the inner core pipe 81 and the outer core pipe 82 are in clearance fit, and the outer core pipe 82 can limit and protect the inner core pipe 81, and meanwhile, both the inner core pipe 81 and the outer core pipe 82 are in threaded connection with the sliding sleeve 73.
In specific implementation, the inner core tube 81 is formed by splicing two semi-closed tubes 811, the two semi-closed tubes 811 are symmetrical about the axis of the inner core tube 81, and when the sample collected by the core tube 8 is extracted, only the two semi-closed tubes 811 need to be taken out from the outer core tube 82, the two semi-closed tubes are relatively disassembled, and the inner core is collected, so that extrusion and damage to the core are avoided to the greatest extent. The inner diameter of the drill bit 15 is the same as the inner diameter of the inner core tube 81.
The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (8)
1. The rope coring three-layer pipe drilling tool is suitable for loose and complex stratum, and the upper end of the rope coring three-layer pipe drilling tool is connected with a rope coring drill rod of a drilling machine and is used, and is characterized by comprising a drilling pipe (1) and a sampling inner pipe, wherein the upper end of the drilling pipe (1) is coaxially connected with the rope coring drill rod, and the sampling inner pipe is coaxially arranged in the drilling pipe (1);
the sampling inner tube comprises a spearhead (2), a spring clip (3), a first hollow joint (4), a water pipe fitting (5), a second hollow joint (6), a single-action joint (7) and a core pipe fitting (8) which are sequentially connected from top to bottom; the core pipe fitting (8) is rotationally connected with the second hollow joint (6) through the single-action joint (7);
an annular step groove (11) is formed in the inner wall of the drilling pipe (1), and the spring clip (3) can be abutted to the top end of the step groove (11) after being opened; a seat ring (16) is integrally arranged below the step groove (11) in the drilling pipe (1), and the bottom of the first hollow joint (4) is abutted with the top of the seat ring (16);
the water pipe fitting (5) is used for partially fixing impurities in the precipitation drilling fluid; the outer diameters of the water pipe fitting (5), the second hollow joint (6), the single-action joint (7) and the core pipe fitting (8) are smaller than the inner diameter of the seat ring (16).
2. The rope coring three-layer pipe drilling tool suitable for loose complex strata according to claim 1, further comprising a connecting pipe (9), wherein the spearhead (2) is embedded in the upper section of the connecting pipe (9), the spring clip (3) is arranged in the middle section of the connecting pipe (9), a plurality of first through holes (91) are formed in the lower section of the connecting pipe (9) in a surrounding mode, and the lower end of the connecting pipe (9) is communicated with the first hollow joint (4).
3. A rope coring three-layer pipe drilling tool adapted for loose complex formations according to claim 2, wherein the water pipe (5) comprises an outer water pipe (51) and an inner water pipe (52), the upper end of the outer water pipe (51) being in communication with the first hollow joint (4), the lower end of the outer water pipe (51) being in threaded connection with the second hollow joint (6);
the inner water pipe (52) and the outer water pipe (51) are coaxially arranged, and an annular sedimentation cavity (53) is reserved between the inner water pipe (52) and the outer water pipe (51); the upper end of the inner water pipe (52) is sealed, a plurality of second through holes (521) are formed around the upper end of the inner water pipe (52), and the lower end of the inner water pipe (52) is communicated with the inner cavity of the second hollow joint (6);
the second hollow joint (6) is communicated with the single-acting joint (7) through a short pipe (10), and a plurality of third through holes (101) are formed in the short pipe (10) in a surrounding mode.
4. A rope coring three-layer pipe drilling tool suitable for loose complex formations according to claim 3, characterized in that the single action joint (7) comprises a connecting shaft (71), a first pushing bearing (72), a sliding sleeve (73), a second pushing bearing (74) and a nut (75), the axis of the connecting shaft (71) is hollow, the upper end of the connecting shaft (71) is communicated with the short pipe (10), and the lower end of the connecting shaft (71) is communicated with the core pipe (8);
an outer baffle ring (76) is integrally arranged in the middle of the connecting shaft (71), the first pushing bearing (72), the sliding sleeve (73) and the second pushing bearing (74) are sequentially sleeved on the part, below the outer baffle ring (76), of the connecting shaft (71), and the lower end of the connecting shaft (71) is in threaded connection with the nut (75);
the sliding sleeve (73) is in clearance fit with the connecting shaft (71), and the sliding sleeve (73) is connected with the core pipe fitting (8).
5. The rope coring three-layer pipe drilling tool suitable for loose complex formations according to claim 4, wherein the core pipe (8) comprises an inner core pipe (81) and an outer core pipe (82), the inner core pipe (81) is coaxially arranged inside the outer core pipe (82), the inner core pipe (81) and the outer core pipe (82) are in clearance fit, and the inner core pipe (81) and the outer core pipe (82) are both in threaded connection with the sliding sleeve (73).
6. A rope coring three-layer pipe drilling tool for loose complex formations according to claim 5, wherein the drilling pipe (1) comprises a snap-in head (12), a drilling outer pipe (13), a reamer (14) and a drill bit (15) connected in sequence from top to bottom;
the step groove (11) and the seat ring (16) are both positioned in the drilling outer tube (13).
7. A rope core three layer pipe drilling tool for loose complex formations according to claim 6, characterized in that the inner diameter of the drill bit (15) is the same as the inner diameter of the inner core pipe (81).
8. A rope coring three-layer pipe drilling tool for loose complex formations according to claim 7, characterized in that the inner core pipe (81) is formed by two half-pipes (811) spliced together, the two half-pipes (811) being symmetrical with respect to the axis of the inner core pipe (81).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320983079.9U CN219509608U (en) | 2023-04-26 | 2023-04-26 | Rope coring three-layer pipe drilling tool suitable for loose complex stratum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320983079.9U CN219509608U (en) | 2023-04-26 | 2023-04-26 | Rope coring three-layer pipe drilling tool suitable for loose complex stratum |
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| Publication Number | Publication Date |
|---|---|
| CN219509608U true CN219509608U (en) | 2023-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320983079.9U Active CN219509608U (en) | 2023-04-26 | 2023-04-26 | Rope coring three-layer pipe drilling tool suitable for loose complex stratum |
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| Country | Link |
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| CN (1) | CN219509608U (en) |
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2023
- 2023-04-26 CN CN202320983079.9U patent/CN219509608U/en active Active
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