CN102966304B - Mud retaining wall and air down-the-hole hammer drilling tool and drilling technology - Google Patents

Mud retaining wall and air down-the-hole hammer drilling tool and drilling technology Download PDF

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Publication number
CN102966304B
CN102966304B CN201210496011.4A CN201210496011A CN102966304B CN 102966304 B CN102966304 B CN 102966304B CN 201210496011 A CN201210496011 A CN 201210496011A CN 102966304 B CN102966304 B CN 102966304B
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drilling rod
drilling
air
intermediate layer
well
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CN102966304A (en
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殷琨
殷其雷
彭枧明
博坤
柳鹤
赵志强
甘心
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Jilin University
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Jilin University
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Abstract

The invention relates to a mud retaining wall and air down-the-hole hammer drilling tool and a drilling technology. The drilling tool is in a coaxial three-channel structure; an inner layer drilling rod is provided with a center channel; the inner layer drilling rod and a middle layer drilling rod form a second channel; the middle layer drilling rod and an outer layer drilling rod form a third channel; the three-channel drilling tool in the drilling process and a hole wall form a fourth channel for independent circulation of mud and compressed air; an outer pipe of the drilling tool adopts threaded connection; two layers of inner pipes are spliced; the connection strength is high; the sealing property is good; screwing and dismounting are facilitated. The compressed air drives a down-the-hole hammer to impact detritus, so that the hard rock drilling efficiency can be improved by more than ten times; the compressed air is closed and cycled in down-the-hole equipment and free from the influence of variations of well depth and confining pressure; the wind pressure and air supply are reduced greatly; the well mouth contamination is prevented; the energy-saving, environment-friendly and low-cost drilling is achieved; the mud drilling is used while the air drilling is used; the effective protection on the well wall is achieved; the adaptability to various complex formations is improved; and the drilling safety is ensured.

Description

Mud off air latent drift drilling tool and drilling technology
Technical field:
The present invention relates to a kind of for Exploration of Oil And Gas and exploitation, geothermal drilling and hydrological well drilling tool, the coaxial-type triple channel drilling tool of especially mud circulation retaining wall, the synchronization job of air air-hammer drilling and drilling technology.
Background technology:
In the medium caliber drilling engineerings such as Exploration of Oil And Gas and exploitation, geothermal drilling and hydrological well, when adopting conventional drilling method to bore chance ground consisting of hard rock, drilling efficiency sharply declines, drilling cost is caused to raise, wellbore construction cycle stretch-out, has become the technical barrier that drilling well circle is both at home and abroad urgently to be resolved hurrily at present.In the last few years, for improving drilling efficiency by a relatively large margin, carried out the research and apply of air latent drift drilling technology both at home and abroad, application practice shows, in ground consisting of hard rock drilling well, efficiency improves more than ten times, has achieved remarkable engineering effort at home and abroad.Due to employing is air latent drift direct circulation drilling technology, and when there being water in well depth increase, well, the confined pressure in shaft bottom also increases thereupon, and compressed-air actuated blast is increased, and compressed-air actuated volume is compressed.For keeping normally creeping into of air latent drift, constantly compressed-air actuated quantity delivered is increased with the increase of drilling depth, the need that increase of shaft bottom confined pressure, to supplement by the compressed air volume compressed, result in the huge increasing of compressed air require, supporting Air Compressor Equipment increasing number, and supercharger need be equipped with to improve blast.Cause air compressor machine, supercharger equipment investment be large, energy consumption is high, floor space is large, seriously polluted to environment, and effective mud well-flushing retaining wall technique cannot be used.When formation condition is more complicated, in well, comparatively large, the borehole wall stability of the water yield is poor, air drilling method is difficult to application and implements, and limits application and the popularization of air latent drift drilling technology.
Summary of the invention:
The object of the invention is for above-mentioned the deficiencies in the prior art, a kind of mud off air latent drift drilling tool is provided;
Another object of the present invention is to provide a kind of drilling technology of mud off air latent drift.
The object of the invention is to be achieved through the following technical solutions:
Mud off air latent drift drilling tool, drilling tool is coaxial-type triple channel structure, internal layer drilling rod 5 is provided with central passage 20, the ring gap passage formed between internal layer drilling rod 5 and intermediate layer drilling rod 4 is second layer passage, the outer shroud clearance channel formed between intermediate layer drilling rod 4 and outer drilling rod 3 is third layer passage, in drilling well, triple channel drilling tool defines borehole wall outer shroud clearance channel 21 in well and between hole wall, defines four fluid passages in drilling process altogether.
Described coaxial-type triple channel drilling tool, be connected by the upper end of screw thread with outer drilling rod 3 by outer drilling rod top connection 1, outer drilling rod 3 lower end is connected by the upper end of screw thread with outer drilling rod lower contact 7, the lower end of outer drilling rod lower contact 7 is connected by the upper end of screw thread with down-hole hammer top connection 8, down-hole hammer outer tube 13 upper end is connected by the lower end of screw thread with its top connection 8, and down-hole hammer outer tube 13 lower end is threaded connection spline housing 18, intermediate layer drilling rod 4 and internal layer drilling rod 5 are separately fixed in outer drilling rod 3, be inserting mode between the two intermediate layer drilling rods 4 be connected during unloading drilling rod in drilling well and two internal layer drilling rods 5 to connect, drilling rod top connection 2 lower end, intermediate layer is connected with intermediate layer drilling rod 4 upper end by screw thread, intermediate layer drilling rod 4 lower end is connected with drilling rod lower contact 6 upper end, intermediate layer by screw thread, drilling rod lower contact 6 lower end, intermediate layer and down-hole hammer top connection 8 are socket connection, it is interior and fixing that core barrel 9 inserts inner casing upper end cover 10, inner casing upper end cover 10 is contained in the upper surface of inner casing 11, inner casing 11, spacer 14 and lining 16 are contained in the inner cylinder face of outer shell 12 successively, piston 15 is loaded in inner casing 11 and lining 16, drill bit 19 inserts in the spline of spline housing 18 with spline, be stuck in the annular groove on drill bit 19 top with semicircle card 17, restriction drill bit skids off downwards along spline, realize the axial location of drill bit 19.
Mud circulation retaining wall air latent drift drilling technology, comprises the following steps:
Drilling tool in a, connecting well, comprise air latent drift and drill bit and coaxial-type triple channel drilling rod, coaxial-type triple channel drilling tool constitutes three fluid passages mutually closed, both the endoporus central passage 20 of drilling tool internal layer drilling rod 5, the ring gap passage be made up of intermediate layer drilling rod 4 and internal layer drilling rod 5, the outer shroud clearance channel be made up of with intermediate layer drilling rod 4 outer drilling rod 3, constitutes borehole wall outer shroud clearance channel between outer drilling rod 3 and the borehole wall, form four fluid passages altogether;
In b, drilling process, every two fluid passages form a kind of fluid is carried out independent loops fluid passage by ground to shaft bottom, therefore the fluid passage that two supply compressed air and mud two kinds of dynamic medium independent loops is respectively had in well, the power cycle medium of two kinds of different fluid is used, the slurry fluid dynamic medium both supplied by slush pump and the compressed air fluid dynamic medium supplied by air compressor in drilling process;
The outer shroud clearance channel that the compressed air exported by air compressor in c, drilling well is formed with intermediate layer drilling rod 4 through outer drilling rod 3, enter in air latent drift and drive down-hole hammer work, the high frequency high energy impact power produced, directly acts on drill bit, realizes creeping into the efficient detritus of bottom rock;
The ring gap passage that waste gas after d, the work of driving down-hole hammer is formed with internal layer drilling rod 5 via the intermediate layer drilling rod 4 that down-hole hammer inner passage enters triple channel drilling tool, exhausts gases in air.The circulation of compressed air in well is in closed state completely with work, in independent loops system, not with contact in well and UNICOM, make compressed air not be subject to the impact of borehole fluid confined pressure and fluctuation;
E, while air air-hammer drilling, the endoporus central passage 20 of the coaxial-type triple channel drilling tool of the mud fluid exported by slush pump in well enters shaft bottom, carry rock dust after cooling drill bit ball tooth and landwaste drains into well head along the borehole wall outer shroud clearance channel between outer drilling rod 3 and the borehole wall, enter surface mud pond.
Beneficial effect: high frequency, the high energy impact energy of (1) air latent drift creep in impact rotating detritus mode, make bottom rock realize volume detritus, can make the more current conventional drilling method of hard rock drilling efficiency improve more than ten times; (2) compressed air realizes closed circulation in triple channel drilling tool, and not by the impact of confined pressure change in well depth increase, well etc., blast and air consumption significantly reduce, and Air Compressor Equipment quantity reduces, and fuel consumption is significantly saved, and realizes energy-conserving and environment-protective and low cost drilling well; (3) recover again while air drilling to use mud off, realize the available protecting to the borehole wall, the compliance of various complex stratum condition is strengthened, is beneficial to the wide popularization and application of this technology; (4) drilling tool adopts coaxial-type connected mode, and bonding strength is high, and unloading is convenient, rapid, good airproof performance; (5) compressed air closed circulation avoids the dust pollution of existing air drilling, is beneficial to environmental protection.When in drilling process, upper and lower two triple channel drilling rods connect, only need the outer drilling rod lower contact 7 of triple channel drilling rod above unloading and the screw thread of the outer drilling rod top connection 1 of triple channel drilling rod below, be socket connection mode between the intermediate layer drilling rod 4 of two drilling rods and internal layer drilling rod 5, intermediate layer drilling rod 4 automatically completes with 5, internal layer drilling rod and is connected.Adopt this kind of connected mode, unscrewing of drill rod is convenient, fast, reliable, and the good airproof performance of drilling rod, low cost of manufacture, the unloading mode of drilling rod is identical with common drilling rod.
Accompanying drawing illustrates:
Accompanying drawing 1 is mud off air latent drift drilling tool structure figure
Accompanying drawing 2 is Figure 1A-A, B-B sectional drawing
Accompanying drawing 3 is mud circulation retaining wall air latent drift drilling technology schematic diagram
1 outer drilling rod top connection; 2 intermediate layer drilling rod top connections; 3 outer drilling rods; 4 intermediate layer drilling rods; 5 internal layer drilling rods; 6 intermediate layer drilling rod lower contacts; 7 outer drilling rod lower contacts; 8 down-hole hammer top connections; 9 core barrels; 10 inner casing upper end covers; 11 inner casings; 12 outer shells; 13 outer tubes; 14 spacers; 15 pistons; 16 linings; 17 semicircle cards; 18 spline housings; 19 drill bits; 20 central passages; 21 borehole wall outer shroud clearance channel.
Detailed description of the invention:
Be described in further detail below in conjunction with drawings and Examples:
Mud off air latent drift drilling tool, drilling tool is coaxial-type triple channel structure, internal layer drilling rod 5 is provided with central passage 20, the ring gap passage formed between internal layer drilling rod 5 and intermediate layer drilling rod 4 is second layer passage, the outer shroud clearance channel formed between intermediate layer drilling rod 4 and outer drilling rod 3 is third layer passage, in drilling well, triple channel drilling tool defines borehole wall outer shroud clearance channel 21 in well and between hole wall, defines four fluid passages in drilling process altogether.
Described coaxial-type triple channel drilling tool, be connected by the upper end of screw thread with outer drilling rod 3 by outer drilling rod top connection 1, outer drilling rod 3 lower end is connected by the upper end of screw thread with outer drilling rod lower contact 7, the lower end of outer drilling rod lower contact 7 is connected by the upper end of screw thread with down-hole hammer top connection 8, down-hole hammer outer tube 13 upper end is connected by the lower end of screw thread with its top connection 8, and down-hole hammer outer tube 13 lower end is threaded connection spline housing 18, intermediate layer drilling rod 4 and internal layer drilling rod 5 are separately fixed in outer drilling rod 3, socket connection is between the two internal layer drilling rods 5 be connected in the two intermediate layer drilling rods 4 be connected in drilling well and drilling well, intermediate layer drilling rod top connection 2 is connected with intermediate layer drilling rod 4 upper end by screw thread, intermediate layer drilling rod 4 lower end is connected with drilling rod lower contact 6 upper end, intermediate layer by screw thread, drilling rod lower contact 6 lower end, intermediate layer and down-hole hammer top connection 8 are socket connection, it is interior and fixing that core barrel 9 inserts inner casing upper end cover 10, inner casing upper end cover 10 is contained in the upper surface of inner casing 11, inner casing 11, spacer 14 and lining 16 are contained in the inner cylinder face of outer shell 12 successively, piston 15 is loaded in inner casing 11 and lining 16, drill bit 19 inserts in the spline of spline housing 18 with spline, be stuck in the annular groove on drill bit 19 top with semicircle card 17, restriction drill bit skids off downwards along spline, realize the axial location of drill bit 19.
Mud circulation retaining wall air latent drift drilling technology, comprises the following steps:
Drilling tool in a, connecting well, comprise air latent drift and drill bit and coaxial-type triple channel drilling rod, coaxial-type triple channel drilling tool constitutes three fluid passages mutually closed, both the endoporus central passage 20 of drilling tool internal layer drilling rod 5, the ring gap passage be made up of intermediate layer drilling rod 4 and internal layer drilling rod 5, the outer shroud clearance channel be made up of with intermediate layer drilling rod 4 outer drilling rod 3, constitutes borehole wall outer shroud clearance channel, totally four fluid passages between outer drilling rod 3 and the borehole wall;
In b, drilling process, every two fluid passages form a kind of fluid is carried out independent loops fluid passage by ground to shaft bottom, therefore the fluid passage that two supply compressed air and mud two kinds of dynamic medium independent loops is respectively had in well, the power cycle medium of two kinds of different fluid is used, the slurry power medium both supplied by slush pump and the compressed air fluid dynamic medium supplied by air compressor in drilling process;
The outer shroud clearance channel that the compressed air exported by air compressor in c, drilling well is formed with intermediate layer drilling rod 4 through outer drilling rod 3, enter in air latent drift and drive down-hole hammer work, the high frequency high energy impact power produced, directly acts on drill bit, realizes creeping into the efficient detritus of bottom rock;
D, drive down-hole hammer work after the waste gas ring gap passage formed with intermediate layer drilling rod 4 and internal layer drilling rod 5 that enters triple channel drilling tool via down-hole hammer inner passage, exhaust gases in air.The circulation of compressed air in well is in closed state completely with work, in independent loops system, not with contact in well and UNICOM, make compressed air not be subject to the impact of borehole fluid confined pressure;
E, while air air-hammer drilling, the endoporus central passage 20 of the coaxial-type triple channel drilling tool of the mud fluid exported by slush pump in well enters shaft bottom, carry rock dust after cooling drill bit ball tooth and landwaste drains into well head along the borehole wall outer shroud clearance channel between outer drilling rod 3 and the borehole wall, enter surface mud pond.
A kind of mud off circulation that the present invention proposes, air latent drift high speed drilling type drilling technology and coaxial-type triple channel drilling tool.Drilling tool is coaxial-type triple channel structure, as shown in Figure 1: the three layers of tube wall being constituted coaxial-type triple channel drilling rod by outer drilling rod 3, intermediate layer drilling rod 4 and internal layer drilling rod 5, define three passages of fluid, both the endoporus central passage 20 of drilling tool, the ring gap passage be made up of intermediate layer drilling rod 4 and internal layer drilling rod 5, the outer shroud clearance channel that is made up of with intermediate layer drilling rod 4 outer drilling rod 3.In drilling well, triple channel drilling tool defines again a borehole wall outer shroud clearance channel in well and between the borehole wall, therefore triple channel drilling tool altogether defines four fluid passages in drilling process, both drilling tool central passage, ring gap passage, outer shroud clearance channel and borehole wall outer shroud clearance channel.Except the air latent drift in shaft bottom and drill bit, coaxial-type triple channel drilling tool is also made up of many coaxial-type triple channel drilling rods, and in drilling well, the quantity of triple channel drilling rod is determined by well depth, is connected between triple channel drilling rod with screw thread.The connected mode of coaxial-type triple channel drilling tool: the outer drilling rod lower contact 7 of a triple channel drilling rod is above connected by screw thread with the outer drilling rod top connection 1 of the triple channel drilling rod of below; The intermediate layer drilling rod 4 of triple channel drilling rod and internal layer drilling rod 5 are separately fixed in outer drilling rod 3, socket connection is between the two internal layer drilling rods 5 be connected in the two intermediate layer drilling rods 4 be connected in drilling well and drilling well, intermediate layer drilling rod top connection 2 is connected with intermediate layer drilling rod 4 upper end by screw thread, intermediate layer drilling rod 4 lower end is connected with drilling rod lower contact 6 upper end, intermediate layer by screw thread, and drilling rod lower contact 6 lower end, intermediate layer and down-hole hammer top connection 8 are socket connection.In drilling process during unloading drilling rod, only need the outer drilling rod lower contact 7 of unloading top triple channel drilling rod and the screw thread of the outer drilling rod top connection 1 of bottom triple channel drilling rod, intermediate layer drilling rod 4 automatically completes with 5, internal layer drilling rod and is connected.Adopt this kind of connected mode, unscrewing of drill rod is convenient, fast, reliable, and the good airproof performance of drilling rod, low cost of manufacture, and the unloading mode of drilling rod is identical with common drilling rod.
The lower contact 7 of coaxial-type triple channel drilling rod is with the top connection 8 of the hollow type down-hole hammer that is threaded, and hollow type down-hole hammer is made up of down-hole hammer top connection 8, core barrel 9, inner casing upper end cover 10, inner casing 11, outer shell 12, outer tube 13, spacer 14, piston 15, lining 16, semicircle card 17, spline housing 18 and drill bit 19 etc.Down-hole hammer top connection 8 and spline housing 18 are all connected with the screw thread of screw thread with outer tube 13 2 end, part 9 to 17 is assemblied in outer tube 13: it is interior and fixing that core barrel 9 inserts inner casing upper end cover 10, inner casing upper end cover 10 is contained in the upper surface of inner casing 11, inner casing 11, spacer 14 and lining 16 are contained in the inner cylinder face of outer shell 12 successively, piston 15 is loaded in inner casing 11 and lining 16, and high-frequency reciprocating motion within it.Drill bit 19 inserts in the spline of spline housing 18 with spline, is stuck in the annular groove on drill bit 19 top with semicircle card 17, and restriction drill bit skids off downwards along spline, realizes the axial location of drill bit 19.
Four fluid passages are formed in well altogether in drilling process, two passages are used for mud circulation, both mud was inputted by central passage, and the endoporus central passage 20 through drill bit 19 is discharged by the outage bottom drill bit, and the outer shroud clearance channel 21 entered between drilling tool and the borehole wall drains into outside well.Other two passages are used for compressed-air actuated enclosed circulation, the outer shroud clearance channel that the compressed air of air compressor supply is made up of outer drilling rod 3 and intermediate layer drilling rod 4 inputs, axial admission straight hole in down-hole hammer top connection enters in the cylinder of down-hole hammer, promote the motion of piston 15 high-frequency reciprocating, drill bit 19 is produced to the percussion of high frequency high energy, realize creeping into the efficient detritus of shaft bottom hard formation.Waste gas after work enters the annular channel between outer tube 13 and outer shell 12, inclined hole again on the left of down-hole hammer top connection 8 enters the ring gap passage that intermediate layer drilling rod 4 and internal layer drilling rod 5 form and drains in the air outside well, completes the closed circulation of compressed air in well.The closed circulation of compressed air in well solves from principle that compressed air strengthens with well depth in drilling process, shaft bottom confined pressure increases compressed-air actuated impact, fundamentally solves that compressed air volume is compressed, blast raises, needs constantly to increase the technical barrier of compressed air require and pressure in drilling well.Mud circulating system and compressed air system mutually close, synchronization job, independent loops work.The efficient detritus drilling well of air latent drift is implemented in drilling well; compressed air is not by the impact of confined pressure change in well; significantly reduce investment and the energy consumption of compressed air quantity delivered and Air Compressor Equipment; mud circulation can be realized again simultaneously; protection sidewall safety; adapt to the application of various stratum, expand the application of air drilling.In view of this, the present invention can implement compressed air closed circulation, the efficient detritus of hollow type air latent drift creeps into the new drilling combined together with drilling mud retaining wall three kinds of drilling technologies.
Mud circulation retaining wall air latent drift well drilling tool and technological principle are shown in Fig. 1, Fig. 2, Fig. 3, and in well, tool part comprises air latent drift and drill bit and coaxial-type triple channel drilling rod; Ground tool part is mainly triple channel air water tap.Coaxial-type triple channel drilling tool constitutes three fluid passages mutually closed, both endoporus central passages 20 of drilling tool internal layer drilling rod 5; The ring gap passage be made up of intermediate layer drilling rod 4 and internal layer drilling rod 5; The outer shroud clearance channel be made up of with intermediate layer drilling rod 4 outer drilling rod 3; The 4th fluid passage, both borehole wall outer shroud clearance channel is constituted between coaxial triple channel drilling tool and the borehole wall.Four fluid passages in drilling process, every two fluid passages form a kind of fluid the is carried out independent loops fluid passage mutually closed by ground to shaft bottom, and therefore have the fluid passage that two supply compressed air and mud two kinds of fluid dynamic medium independent loops respectively in well.Power cycle medium, the slurry power medium both supplied by slush pump and the compressed air fluid dynamic medium supplied by air compressor of two kinds of different fluid is used in drilling process.
Mud circulation retaining wall air latent drift drilling technology principle is as shown in Figure 3: the gas inlet rubber tube of the compressed air exported by air compressor in drilling well on the right side of triple channel air water tap, enter an annular channel of triple channel air water tap, again through outer shroud clearance channel that the outer drilling rod 3 of triple channel drilling tool is formed with intermediate layer drilling rod 4, enter in air latent drift and drive down-hole hammer pistons work, the high frequency high energy impact power produced directly acts on drill bit, realizes creeping into the efficient detritus of bottom rock.Drive the ring gap passage that the waste gas after down-hole hammer work is formed with internal layer drilling rod 5 via the intermediate layer drilling rod 4 that down-hole hammer inner passage enters triple channel drilling tool, again through another annular channel of triple channel air water tap, exhausted gases in air by the exhaust hose on the left of triple channel air water tap.The circulation of compressed air in well is in closed state completely with work, in independent loops system, not with contact in well and UNICOM, make compressed air not by the impact of borehole fluid confined pressure, considerably reduce compressed-air actuated wind pressure of work, and air latent drift is in all the time not by the steady-working state of ectocine.While air air-hammer drilling, the mud fluid exported by slush pump enters triple channel drilling tool by the bend pipe at triple channel air water tap top, the central passage of the endoporus central passage 20 of the coaxial-type triple channel drilling tool in well, air latent drift and drill bit drains into shaft bottom, cooling drill bit ball tooth, carry rock dust and landwaste that drill bit gets out, drain into well head along the borehole wall outer shroud clearance channel between triple channel drilling tool and the borehole wall, enter the mud pit on ground.
In drilling process, the compressed air circulating system and mud circulating system form two independently hydrodynamic circulation systems: the compressed air circulating system completes the driving to air latent drift; produce the impact energy of high frequency high energy; the more conventional gear wheel drilling efficiency of the drilling efficiency of hard rock can be made to improve more than ten times; increase substantially drilling engineering efficiency; reduce drilling cost; shorten the drilling engineering cycle, and avoid the dust pollution of regular air drilling well, be beneficial to environmental protection.Synchronous applications mud circulating system while air air-hammer drilling, makes full use of mud fluid effect in drilling well, reliably cools drill bit; get rid of the landwaste and rock dust that get out, in balance well, the pressure on stratum, protects the safety of the borehole wall effectively; lubrication drilling tool, reduces pivotal resistance etc.Mud circulation retaining wall air latent drift drilling technology achieves Alternative drilling well new technology: merged that air latent drift is efficient, fast, low cost detritus creeps into; The circulation of compressed air well inner sealing significantly reduces blast, the stable effective work of protection down-hole hammer; Mud circulation protection sidewall safety, cooling drill bit, gets rid of the multiple advanced drilling technologies such as rock dust bits and is integrated, realize a kind of Alternative drilling well new technology.

Claims (2)

1. a mud off air latent drift drilling tool, drilling tool is coaxial-type triple channel structure, internal layer drilling rod (5) is provided with central passage (20), the ring gap passage formed between internal layer drilling rod (5) and intermediate layer drilling rod (4) is second layer passage, the outer shroud clearance channel formed between intermediate layer drilling rod (4) and outer drilling rod (3) is third layer passage, in drilling well, triple channel drilling tool defines borehole wall outer shroud clearance channel (21) in well and between hole wall, four fluid passages are defined altogether in drilling process, it is characterized in that, described coaxial-type triple channel drilling tool, be connected by the upper end of screw thread with outer drilling rod (3) by outer drilling rod top connection (1), outer drilling rod (3) lower end is connected by the upper end of screw thread with outer drilling rod lower contact (7), the lower end of outer drilling rod lower contact (7) is connected with down-hole hammer top connection (8) upper end by screw thread, down-hole hammer outer tube (13) upper end is connected with its top connection (8) lower end by screw thread, down-hole hammer outer tube (13) lower end is threaded connection spline housing (18), intermediate layer drilling rod (4) and internal layer drilling rod (5) are separately fixed in outer drilling rod (3), intermediate layer drilling rod top connection (2) is connected with intermediate layer drilling rod (4) upper end by screw thread, intermediate layer drilling rod (4) lower end is connected with drilling rod lower contact (6) upper end, intermediate layer by screw thread, drilling rod lower contact (6) lower end, intermediate layer and down-hole hammer top connection (8) are socket connection, it is interior and fixing that core barrel (9) inserts inner casing upper end cover (10), the connected mode of coaxial-type triple channel drilling tool in drilling well: the outer drilling rod lower contact (7) of a triple channel drilling rod is connected with screw thread with the outer drilling rod top connection (1) of a triple channel drilling rod below above, above intermediate layer drilling rod (4) and the internal layer drilling rod (5) of a triple channel drilling rod and the intermediate layer drilling rod (4) of a triple channel drilling rod below be inserting mode between internal layer drilling rod (5) and be connected, inner casing upper end cover (10) is contained in the upper surface of inner casing (11), inner casing (11), spacer (14) and lining (16) are contained in the inner cylinder face of outer shell (12) successively, piston (15) is loaded in inner casing (11) and lining (16), drill bit (19) inserts in the spline of spline housing (18) with spline, be stuck in the annular groove on drill bit (19) top with semicircle card (17), restriction drill bit skids off downwards along spline, realize the axial location of drill bit (19).
2. a mud circulation retaining wall air latent drift drilling technology, is characterized in that, comprise the following steps:
Drilling tool in a, connecting well, comprise air latent drift and drill bit and coaxial-type triple channel drilling rod, coaxial-type triple channel drilling tool constitutes three fluid passages mutually closed, both the endoporus central passage (20) of drilling tool internal layer drilling rod (5), the ring gap passage be made up of intermediate layer drilling rod (4) and internal layer drilling rod (5), the outer shroud clearance channel be made up of outer drilling rod (3) and intermediate layer drilling rod (4), borehole wall outer shroud clearance channel (21) is constituted, totally four fluid passages between outer drilling rod (3) and the borehole wall;
In b, drilling process, every two fluid passages form a kind of fluid is carried out independent loops fluid passage by ground to shaft bottom, therefore the fluid passage that two supply compressed air and mud two kinds of dynamic medium independent loops is respectively had in well, the power cycle medium of two kinds of different fluid is used, the slurry power medium both supplied by slush pump and the compressed air fluid dynamic medium supplied by air compressor in drilling process;
The outer shroud clearance channel that the compressed air exported by air compressor in c, drilling well is formed through outer drilling rod (3) and intermediate layer drilling rod (4), enter in air latent drift and drive down-hole hammer work, the high frequency high energy impact power produced, directly act on drill bit, realize creeping into the efficient detritus of bottom rock;
The ring gap passage that waste gas after d, the work of driving down-hole hammer enters triple channel drilling tool intermediate layer drilling rod (4) via down-hole hammer inner passage is formed with internal layer drilling rod (5), exhaust gases in air, the circulation of compressed air in well is in closed state completely with work, in independent loops system, not with contact in well and UNICOM, make compressed air by the impact of borehole fluid confined pressure;
E, while air air-hammer drilling, the endoporus central passage (20) of the coaxial-type triple channel drilling tool of the mud fluid exported by slush pump in well enters shaft bottom, carry rock dust after cooling drill bit ball tooth and landwaste drains into well head along the borehole wall outer shroud clearance channel (21) between outer drilling rod (3) and the borehole wall, enter surface mud pond.
CN201210496011.4A 2012-11-28 2012-11-28 Mud retaining wall and air down-the-hole hammer drilling tool and drilling technology Expired - Fee Related CN102966304B (en)

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