CN102296950B - Hydraulic shearing type sampling drilling tool - Google Patents
Hydraulic shearing type sampling drilling tool Download PDFInfo
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- CN102296950B CN102296950B CN201110125583.7A CN201110125583A CN102296950B CN 102296950 B CN102296950 B CN 102296950B CN 201110125583 A CN201110125583 A CN 201110125583A CN 102296950 B CN102296950 B CN 102296950B
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Abstract
The invention relates to a hydraulic shearing type sampling drilling tool, which consists of an outer sampling pipe assembly and an inner sampling pipe assembly arranged in the outer sampling pipe assembly, wherein the outer sampling pipe assembly comprises an upper joint, an upper centralizer, an outer pipe joint, an outer sampling pipe, a lower centralizer and a drill bit which are sequentially arranged from top to bottom, the inner sampling pipe assembly comprises a suspension system, a guide system and a press-in sampling pipe assembly, the guide system and the press-in sampling pipe assembly are positioned below the suspension system, and the press-in sampling pipe assembly can slide up and down along the inner wall of the outer sampling pipe (30) and the guide system in a sealing manner. The hydraulic shearing type sampling drilling tool provided by the invention can effectively solve the sampling problem under the condition of soft stratum such as ocean and land water areas and the like and greatly improve the quality and sampling efficiency of samples.
Description
Technical field
The present invention relates to a kind of hydraulic shearing type sampling drilling tool, with exploring sample boring under the broken ground conditions such as Yu Haiyang and waters, land.Belong to geology, oil, seafari technical field.
Background technology
At present, along with resource exploration and scientific research need also rising of sampling workload under the broken ground conditions such as ， ocean and waters, land, the quality of sample has determined accuracy and the science of stratum and constituent analysis research thereof.
Conventional sampling mode mainly adopts swinging sampling, be that drilling equipment drives drilling rod and Sampling driller revolution, thereby sample is also extracted in cutting stratum, probe tube can be that monotubular can be also the bitubular, this method is mainly applicable to hard formation, for under broken ground condition, easily cause disturbance, the breakage of sample and come off, even occurring blank pipe phenomenon.
Also having a kind of method is the drilling tool that adopts mechanical pressuring method, its operating principle is by drilling equipment, drilling rod to be exerted pressure, drilling rod makes Sampling driller be pressed into broken ground to Sampling driller transmission of pressure again, but this method easily causes the phenomenons such as the bending of drilling rod even fractures, it only can be applied in shallow stratum simultaneously, in application, is very limited.
The problems such as existing various sampling instrument ubiquity sampling difficulty, efficiency under the broken ground conditions such as ocean and waters, land is low, sample is everlasting in the process of sampling and is disturbed simultaneously, is difficult to obtain high-quality sample.Another problem that traditional Sampling driller exists is exactly that time of Sampling driller dismounting sampling mechanism is long, efficiency is low.Therefore be necessary to invent a kind of novel Sampling driller, solve the deficiencies in the prior art, meet sampling requirement.
Summary of the invention
The object of the invention is the defect for above-mentioned prior art, provide a kind of and can effectively solve the sampling difficult problem under the broken ground conditions such as ocean and waters, land and significantly improve the quality of sample and the hydraulic shearing type sampling drilling tool of sampling efficiency.The technical scheme that the present invention takes is for achieving the above object: a kind of hydraulic shearing type sampling drilling tool, by the sampling inner tube assembly that samples outer pipe assembly and be arranged in the outer pipe assembly of described sampling, formed, the outer pipe assembly of described sampling comprises: top connection, upper centralizer, outer tube joint, sampling outer tube, lower centralizer and drill bit, wherein, described top connection, described upper centralizer, described outer tube joint, described sampling outer tube, described lower centralizer is from top to bottom arranged in order with described drill bit and adjacent each part is connected by screw thread, in described upper centralizer, be provided with seat ring, in described lower centralizer, be provided with centering ring, the upper end of described top connection is connected with described drill rod thread, described sampling inner tube assembly comprises: have spear-head, water supply connector, the suspension of hanging ring, water out adapter, wherein, the bottom of described spear-head is connected with the top of described water supply connector, the bottom of described water supply connector be threaded with the top of described water out adapter and by described hanging ring sandwiched be fixed on the upper end of described water out adapter, described hanging ring coordinates with seat ring, the guidance system with guide piston bar and guiding damper piston, described guide piston bar is connected with described guiding damper piston, on described guide piston bar, has gathering sill, and be pressed into probe tube assembly, the described probe tube assembly that is pressed into comprises suspension shear joint, there is a tubular suspension joint that can form the inner convex platform of suspension strut face lower end, there is the T shape adapter sleeve of a flange upper end, lock ring one, lock ring two, seal nipple, fast assembly and disassembly mechanism, sampling inner tube, sampling shoe, wherein, described shear joint bottom is threaded with described suspension joint, the flange of described adapter sleeve is suspended on the inner convex platform of described suspension joint, described lock ring one and described lock ring two spiral locks are pressed in the bottom of described suspension joint tightly, the bottom of described adapter sleeve is threaded with the upper end of described seal nipple, the lower end of described seal nipple is connected with described fast assembly and disassembly mechanism top, the top of described sampling inner tube is connected in the below of described fast assembly and disassembly mechanism by inner pipe joint, bottom is connected with the top of described sampling shoe, in described sampling inner tube assembly, described guidance system and described in be pressed into the below that probe tube assembly is positioned at described suspension, the described probe tube assembly that is pressed into can slide along sampling outer tube wall and described guidance system upper-lower seal, described sampling inner tube assembly is by described suspension, described guiding flexible coupling, described seat ring and described centering ring coordinate and locate with the outer pipe assembly of described sampling.Described fast assembly and disassembly mechanism comprises: guiding flexible coupling, and described guiding flexible coupling top is provided with along its axially extended location outside keyway, and bottom is provided with locating piece; Location locknut; Location locking key; And inner pipe joint, described inner pipe joint upper inner be provided with along strong groove in its axially extended location and with described location in strong groove connect the suspension groove of ring-type, the locking key of described location engages with described location outside keyway in described guiding flexible coupling and the described location internal keyway on described inner pipe joint, described locating piece in described guiding flexible coupling engages with the described suspension groove on described inner pipe joint, described location locknut is connected with the locking key of described location, and is threaded with described guiding flexible coupling.In described guiding flexible coupling, there is shrinkage pool, be pressed into sampling and time coordinate with described guiding damper piston being pressed into probe tube assembly.In described sampling inner tube, be provided with pressure relief vent.In described guiding flexible coupling, be provided with feather key, match with the gathering sill on described guide piston bar.One or more shear pins will be pressed into probe tube assembly and be connected with suspension.Quantity and the structure of described shear pin are adjusted according to formation characteristics, and preferably, described shear pin quantity is 1 to 3.
The invention has the beneficial effects as follows that becoming machinery is pressurised into hydraulic pressurization, be pressed into probe tube assembly to be pressed at a high speed stratum, improve sample taking rate, sampling inner tube assembly is realized single action with the outer pipe assembly of sampling, prevent that sample is received disturbance in sampling process, improved the quality of sample.Be pressed into probe tube assembly with guidance system and sampling outer pipe assembly location and coordinate accurately.By adjusting quantity and the structural parameters of shear pin, applicable Different Strata characteristic.Utilize rope salvaging device directly to reclaim sampling inner tube assembly simultaneously, shortened the time of sample to ground, adopt fast assembly and disassembly mechanism can effectively improve the speed of sampling mechanism dismounting, significantly improved the efficiency of sample boring.
Accompanying drawing explanation
Fig. 1 is the structural representation of hydraulic shearing type sampling drilling tool.
Fig. 2 is the phantom drawing before fast assembly and disassembly mechanism assembling.
Fig. 3 is the phantom drawing after fast assembly and disassembly mechanism assembling.
Wherein 1, top connection; 2, spear-head; 3, elastic cylindrical pin; 4, water supply connector; 5, hanging ring; 6, water out adapter; 7, seat ring; 8, upper centralizer; 9, shear joint; 10, shear pin; 11, suspension joint; 12, guide piston bar; 13, elastic cylindrical pin; 14, outer tube joint; 15, adapter sleeve; 16, lock ring one; 17, lock ring two; 18, seal nipple; 19, sealing ring; 20, feather key; 21, guiding flexible coupling; 22, location outside keyway; 23, location locknut; 24, location locking key; 25, locating piece; 26, inner pipe joint; 27, pressure relief vent; 28, sampling inner tube; 29, gathering sill; 30, sampling outer tube; 31, centering ring; 32, lower centralizer; 33, sealing ring; 34, guiding damper piston; 35, jump ring; 36, sampling shoe; 37, drill bit; 38, location internal keyway; 39, suspension groove.
The specific embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.
Hydraulic shearing type sampling drilling tool of the present invention shown in Fig. 1, consists of the sampling inner tube assembly that samples outer pipe assembly and be arranged in the outer pipe assembly of described sampling.
As shown in Figure 1, the outer pipe assembly of sampling of the present invention comprises top connection 1, upper centralizer 8, outer tube joint 14, sampling outer tube 30, lower centralizer 32 and the drill bit 37 being arranged in order from top to bottom, above-mentioned each component parts is tubulose, and adjacent each part interconnects by screw thread.Upper centralizer 8 and lower centralizer 32 inwalls respectively have a step supporting surface, on step supporting surface in upper centralizer 8, seat ring 7 is set, on step supporting surface in lower centralizer 32, centering ring 31 is set, for locating below the sampling inner tube assembly of describing in detail, the upper end of top connection 1 is connected with drill rod thread.
Sampling inner tube assembly of the present invention comprises suspension, guidance system and is pressed into probe tube assembly.This suspension has spear-head (2), water supply connector (4), hanging ring (5), water out adapter (6).This guidance system consists of guide piston bar 12 and guiding damper piston 34.This is pressed into probe tube assembly and comprises that suspension shear joint 9, lower end have a tubular suspension joint 11, upper end that can form the inner convex platform of suspension strut face to have T shape adapter sleeve 15, lock ring 1, lock ring 2 17, seal nipple 18, fast assembly and disassembly mechanism, sampling inner tube 28 and the sampling shoe 36 of a flange.In this sampling inner tube assembly, this guidance system and be pressed into probe tube assembly and be positioned at this suspension below, this be pressed into probe tube assembly can along sampling outer tube 30 inwalls and this guidance system upper-lower seal slide.
The bottom of spear-head 2 is connected with the top of water supply connector 4 by elastic cylindrical pin 3, and the bottom of water supply connector 4 is threaded with the top of water out adapter 6, and by hanging ring 5 sandwiched be fixed on the upper end of water out adapter 6.In water supply connector 4 and water out adapter 6, be provided with water inlet and delivery port, water supply connector 4 and water out adapter 6 internal communication.Hanging ring 5 coordinates with seat ring 7, realizes and the location that samples outer pipe assembly, and forms close encapsulation chamber.Water out adapter 6 connects as one by elastic cylindrical pin 13 and guide piston bar 12, and is connected with shear joint 9 by shear pin 10.On guide piston bar 12, be provided with gathering sill 29, guide piston bar 12 belows are connected with guiding damper piston 34 by screw thread, on guiding damper piston 34, are provided with sealing ring 33, realize and sample the sealing between inner tube 28 and coordinate guiding.
Shear joint 9 bottoms are threaded with suspension joint 11, the flange of adapter sleeve 15 is suspended on the inner convex platform of suspension joint 11 and connects to realize hanging, and tight with the spiral shell padlock of lock ring 2 17 by lock ring 1, adapter sleeve 15 bottom is threaded with seal nipple 18 upper end, sealing ring 19 is installed on seal nipple 18, outside forms and coordinates guiding and sealing with outer tube joint 14, and inside forms and coordinates guiding and sealing with guide piston bar 12.Seal nipple 18 lower end interconnects by screw thread with guiding flexible coupling 21, in guiding flexible coupling 21, feather key 20 is installed, feather key 20 matches with the gathering sill 28 on guide piston bar 12, realize location and guide function, be pressed into probe tube assembly and can prolong guide piston bar 12 down slidings.
As shown in Figures 2 and 3, guiding flexible coupling 21 forms fast assembly and disassembly mechanism with location locknut 23, location locking key 24, inner pipe joint 26.Guiding flexible coupling 21 tops are provided with along its outside keyway 22， bottom, axially extended location and are provided with locating piece 25.Inner pipe joint 26 tops are provided with along the ring-type suspension groove 39 of being good for groove 38 in its axially extended location and connecting with the interior strong groove 38 in location.Boss in the locking key 24 of location matches with the groove in the locknut 23 of location, and guiding flexible coupling 21 is threaded with location locknut 23.Inner pipe joint 26 is connected with the locating piece 25 in guiding flexible coupling 21 by the location internal keyway 38 of its inside, location outside keyway 22 in flexible coupling 21 and the location internal keyway 38 on inner pipe joint 26 match with guiding in location locking key 24, realize being connected of lead flexible coupling 21 and inner pipe joint 26.The locating piece 25 of flexible coupling 21 of leading during installation enters the location internal keyway 38 of inner pipe joint 26 inside, internal keyway 38 bottoms, arrival location rotate inner pipe joint 26 afterwards to be entered locating piece 25 and locates in the suspension groove 39 of internal keyway 38 perforations, the location internal keyway 38 of inner pipe joint 26 aligns with the location outside keyway 22 in guiding flexible coupling 21 simultaneously, location locknut 23 drives location locking key 24 to enter location internal keyway 38, until location locknut 23 and guiding flexible coupling 21 lockings connect as one inner pipe joint 26 and guiding flexible coupling 21.
Before starting to creep into, sampling inner tube assembly can be installed on earth's surface or deck outside sampling in pipe assembly, and cooperation puts in place, also can be outside sampling at the bottom of pipe assembly Xia Dao hole after, at the bottom of rendering to hole by drilling rod centre bore on Zai Cong earth's surface or deck, by hanging ring 5 and the outer pipe assembly of sampling, realize location, and form annular seal space.
When starting to sample work, increase the pressure of drilling fluid, drilling fluid is entered in Sampling driller by drilling rod centre bore, by the water inlet in water supply connector 4, enter, by the inner hollow in water supply connector 4, be partly passed to water out adapter 6, and entered in the annular seal space between sampling inner tube assembly and the outer pipe assembly of sampling by delivery port, due to the sealing ring 19 on seal nipple 18, hanging ring 5 on inner tube assembly has formed annular seal space with the seat ring 7 on outer pipe assembly, therefore pressure constantly raises, seal nipple 18 is applied to downward pressure, along with being elevated to, pressure cuts off shear pin 10, now being pressed into probe tube assembly slides along guide piston bar 12, be pressed into probe tube assembly to be pressed at a high speed stratum, coordinating between feather key 20 and gathering sill 24 prevents from being pressed into probe tube assembly and turns round in sampling process, avoid sample to be disturbed.When being pressed into probe tube assembly and sliding into the below of guide piston bar 12, boss on guiding damper piston 34 enters the inside shrinkage pool of guiding flexible coupling 21, cause internal flow compression, produce thrust upwards, play buffering and the effect of locating, avoid drilling tool to be subject to large impact, the former fluids such as drilling fluid that are enclosed in inner tube inside can flow to outside sampling inner tube 28 by pressure relief vent 27, prevent that the pressure being pressed between probe tube assembly and guidance system from sharply rising, damage drilling tool.
Be pressed into probe tube assembly and complete and be pressed into after sampling work, the power-equipments such as rig drive the outer pipe assembly of sampling and on drill bit 37 rotary drillings, now sample inner tube assembly not turn round, avoid the sample in inner tube to be disturbed.In the time of at the bottom of hole is arrived in the outer pipe assembly rotary drilling of sampling, stop creeping into.At the bottom of utilizing wire line coring winch, from aperture, rope salvaging device is rendered to hole in drilling rod, automatically catch spear-head 2, by being suspended on, guiding is pressed into probe tube assembly on damper piston 34 and its inner sample proposes on earth's surface or deck in the lump.Now pass through fast assembly and disassembly mechanism, unclamp location locknut 23, drive location locking key 24 to skid off the location internal keyway 38 on inner pipe joint 26, now rotate inner pipe joint 26 until the locating piece 25 of guiding in flexible coupling 21 skids off suspension groove 39 on inner pipe joint 26 to location internal keyway 38, locating piece 25 can exit location internal keyway 38, replaceable sampling inner tube 28 parts such as grade.
The invention solves the difficult problem that common drilling tool sampling is difficult under the broken ground conditions such as ocean, waters, land, taking rate is low and sample quality is poor, its advantage is to adopt hydraulic pressurization, changed the problem of using machinery pressurization easily to cause drill pipe buckling even to fracture, be pressed into probe tube assembly to be pressed at a high speed stratum, avoid sample disturbance, improve sampling efficiency and sample quality, improved the safety that drilling tool uses simultaneously.By adjusting quantity and the structural parameters of shear pin, can adapt to Different Strata characteristic.And the application of wire line coring structure and fast assembly and disassembly mechanism has improved the replacing efficiency of sampling mechanism, has significantly improved the efficiency of sample boring.
Be more than preferred embodiment of the present invention, all changes of doing according to technical solution of the present invention, when the function producing does not exceed the scope of technical solution of the present invention, all belong to protection scope of the present invention.
Claims (7)
1. a hydraulic shearing type sampling drilling tool, is characterized in that, by the sampling inner tube assembly that samples outer pipe assembly and be arranged in the outer pipe assembly of described sampling, formed,
The outer pipe assembly of described sampling comprises: top connection (1), upper centralizer (8), outer tube joint (14), sampling outer tube (30), lower centralizer (32) and drill bit (37), wherein, described top connection (1), described upper centralizer (8), described outer tube joint (14), described sampling outer tube (30), described lower centralizer (32) is from top to bottom arranged in order with described drill bit (37) and adjacent each part is connected by screw thread, in described upper centralizer (8), be provided with seat ring (7), in described lower centralizer (32), be provided with centering ring (31), the upper end of described top connection (1) is connected with drill rod thread,
Described sampling inner tube assembly comprises: have spear-head (2), water supply connector (4), the suspension of hanging ring (5), water out adapter (6), wherein, the bottom of described spear-head (2) is connected with the top of described water supply connector (4), the bottom of described water supply connector (4) be threaded with the top of described water out adapter (6) and by described hanging ring (5) sandwiched be fixed on the upper end of described water out adapter (6), described hanging ring (5) coordinates with seat ring (7), the guidance system with guide piston bar (12) and guiding damper piston (34), described guide piston bar (12) is connected with described guiding damper piston (34), on described guide piston bar (12), has gathering sill, and be pressed into probe tube assembly, the described probe tube assembly that is pressed into comprises suspension shear joint (9), there is a tubular suspension joint (11) that can form the inner convex platform of suspension strut face lower end, there is the T shape adapter sleeve (15) of a flange upper end, lock ring one (16), lock ring two (17), seal nipple (18), fast assembly and disassembly mechanism, sampling inner tube (28), sampling shoe (36), wherein, described shear joint (9) bottom is threaded with described suspension joint (11), the flange of described adapter sleeve (15) is suspended on the inner convex platform of described suspension joint (11), described lock ring one (16) and described lock ring two (17) spiral locks are pressed in the bottom of described suspension joint (11) tightly, the bottom of described adapter sleeve (15) is threaded with the upper end of described seal nipple (18), the lower end of described seal nipple (18) is connected with described fast assembly and disassembly mechanism top, the top of described sampling inner tube (28) is connected in the below of described fast assembly and disassembly mechanism by inner pipe joint (26), bottom is connected with the top of described sampling shoe (36), in described sampling inner tube assembly, described guidance system and described in be pressed into the below that probe tube assembly is positioned at described suspension, the described probe tube assembly that is pressed into can slide along sampling outer tube (30) inwall and described guidance system upper-lower seal,
Described sampling inner tube assembly is coordinated and is located by the outer pipe assembly of described suspension, described guiding flexible coupling (21), described seat ring (7) and described centering ring (31) and described sampling.
2. hydraulic shearing type sampling drilling tool according to claim 1, it is characterized in that, described fast assembly and disassembly mechanism comprises: guiding flexible coupling (21), and described guiding flexible coupling (21) top is provided with along its axially extended location outside keyway (22), and bottom is provided with locating piece (25), location locknut (23), location locking key (24), and inner pipe joint (26), described inner pipe joint (26) upper inner is provided with along its axially extended location internal keyway (38) and with location internal keyway (38) and connects the suspension groove (39) of ring-type, described location locking key (24) engages with described location outside keyway (22) in described guiding flexible coupling (21) and the location internal keyway (38) on described inner pipe joint (26), locating piece (25) in described guiding flexible coupling (21) engages with the described suspension groove (39) on described inner pipe joint (26), described location locknut (23) is connected with described location locking key (24), and be threaded with described guiding flexible coupling (21).
3. hydraulic shearing type sampling drilling tool according to claim 2, is characterized in that, in described guiding flexible coupling (21), has shrinkage pool, is pressed into sampling and time coordinates with described guiding damper piston (34) being pressed into probe tube assembly.
4. hydraulic shearing type sampling drilling tool according to claim 3, is characterized in that, in described sampling inner tube (28), is provided with pressure relief vent.
5. hydraulic shearing type sampling drilling tool according to claim 4, is characterized in that, is provided with feather key (20) in described guiding flexible coupling (21), matches with the gathering sill on described guide piston bar (12).
6. hydraulic shearing type sampling drilling tool according to claim 5, is characterized in that, one or more shear pins (10) will be pressed into probe tube assembly and be connected with suspension.
7. hydraulic shearing type sampling drilling tool according to claim 6, is characterized in that, described shear pin quantity is 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110125583.7A CN102296950B (en) | 2011-05-16 | 2011-05-16 | Hydraulic shearing type sampling drilling tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110125583.7A CN102296950B (en) | 2011-05-16 | 2011-05-16 | Hydraulic shearing type sampling drilling tool |
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| Publication Number | Publication Date |
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| CN102296950A CN102296950A (en) | 2011-12-28 |
| CN102296950B true CN102296950B (en) | 2014-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110125583.7A Expired - Fee Related CN102296950B (en) | 2011-05-16 | 2011-05-16 | Hydraulic shearing type sampling drilling tool |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102661147B (en) * | 2012-05-25 | 2014-12-31 | 北京探矿工程研究所 | Advanced telescopic sampling drilling tool |
| CN110397422B (en) * | 2019-07-10 | 2021-10-29 | 东北石油大学 | Counting mechanism for underground sliding sleeve opening and closing device |
| CN112855133B (en) * | 2019-11-27 | 2022-06-03 | 中国石油天然气股份有限公司 | Oil testing pipe column and oil testing method |
| CN112112590B (en) * | 2020-09-08 | 2024-07-05 | 中国地质科学院勘探技术研究所 | Rope core drilling tool suitable for ocean drilling and technological method |
| CN112112588B (en) * | 2020-09-08 | 2024-05-14 | 中国地质科学院勘探技术研究所 | Press-in type rope coring drilling tool and coring process method thereof |
| CN112901100A (en) * | 2021-03-11 | 2021-06-04 | 广州海洋地质调查局 | Split type static-pressure slurry coring tool and method |
| CN114183080B (en) * | 2021-12-08 | 2024-03-22 | 中国矿业大学 | Forward and reverse rotation automatic disassembly drill rod capable of transmitting large torque and operation method |
| CN116818410B (en) * | 2023-07-12 | 2023-12-08 | 浙江华东岩土勘察设计研究院有限公司 | Water area rope salvaging type geological sample sampling device and working method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU541026A1 (en) * | 1971-01-05 | 1976-12-30 | Азербайджанский политехнический институт им.Ч.Ильдрыма | Depth sampler |
| US4002213A (en) * | 1974-03-01 | 1977-01-11 | Tigre Tierra, Inc. | Down-the-hole motor for rotary drill rod and process for drilling using the same |
| BE1011266A3 (en) * | 1997-07-08 | 1999-07-06 | Dresser Ind | Core. |
| CN201050318Y (en) * | 2007-05-22 | 2008-04-23 | 辽河石油勘探局 | Loose ground closed core-picking tool |
| CN201095966Y (en) * | 2007-10-19 | 2008-08-06 | 新疆石油管理局钻井工艺研究院 | Coal gas rope coring tool |
| CN201372754Y (en) * | 2009-03-24 | 2009-12-30 | 武汉金地探矿机械有限公司 | Jet-type reverse rope coring drilling tool |
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2011
- 2011-05-16 CN CN201110125583.7A patent/CN102296950B/en not_active Expired - Fee Related
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