CN104763338A - Hole expanding device, pull-back hole expanding assembly and hole expanding drilling method thereof - Google Patents

Hole expanding device, pull-back hole expanding assembly and hole expanding drilling method thereof Download PDF

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Publication number
CN104763338A
CN104763338A CN201510098453.7A CN201510098453A CN104763338A CN 104763338 A CN104763338 A CN 104763338A CN 201510098453 A CN201510098453 A CN 201510098453A CN 104763338 A CN104763338 A CN 104763338A
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China
Prior art keywords
reamer
drill
hole
hole expanding
reaming
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CN201510098453.7A
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Chinese (zh)
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CN104763338B (en
Inventor
霍宇翔
温继伟
马永红
韦猛
袁进科
姜杰
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Chengdu Univeristy of Technology
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Chengdu Univeristy of Technology
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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00Special methods or apparatus for drilling
    • E21B7/28Enlarging drilled holes, e.g. by counterboring
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00Drill bits
    • E21B10/26Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00Drill bits
    • E21B10/60Drill bits characterised by conduits or nozzles for drilling fluids
    • E21B10/61Drill bits characterised by conduits or nozzles for drilling fluids characterised by the nozzle structure
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00Special methods or apparatus for drilling
    • E21B7/18Drilling by liquid or gas jets, with or without entrained pellets

Abstract

The invention relates to a hole expanding device. The hole expanding device comprises a centrally-through drill bit body; a plurality of cutting units which are uniformly distributed at the outer side of the drill bit body are circumferentially arranged in the middle part of the drill bit body; a through hole is formed between adjacent cutting units; a cavitating jet nozzle is fixedly embedded at an outlet end of the at least one through hole. A pull-back hole expanding assembly comprises an impacter, a liquid sealing joint and the hole expanding device, wherein one end of the hole expanding device is in sealing connection with the impacter through threads and while the other end of the hole expanding device is in sealing connection with the liquid sealing joint through the threads. According to the pull-back hole expanding assembly, the hole expanding drilling by the efficient rotating cutting and rock crushing manner under the combination of a torsional impacter and the hole expanding device, or the hole expanding drilling by the impacting rotating and rock crushing manner under the combination of a hydraulic impacter and the hole expanding device, and the multi-process hole expanding drilling method coupled with the cavitating jet sprayed through the cavitating jet at a fast speed to assist the rock crushing can be synchronously achieved while paving a non-excavation pipeline for performing pull-back hole expanding; therefore, the working efficiency of paving a non-excavation pipeline for performing pull-back hole expanding can be effectively increased.

Description

A kind of reamer and pull back reaming assembly and reaming drilling method thereof
Technical field
To pull back when the present invention relates to pipeline installation in non-excavating construction the equipment in reaming stage, particularly relate to a kind of reamer and pull back reaming assembly and reaming drilling method thereof.
Background technology
No-excavation construction method is when not excavating earth surface, utilize the technological means of Geological Engineering, to the practical new technology of a kind of high-tech that various underground pipeline and cable detect, check, lay, repair or change, be called TT (Trenchless Technology) or No-Dig abroad.To carry out under highway crossing, railway, building, river, crops and vegetation protection district, paleovolcanic structure district etc. do not allow the condition maybe can not the excavated supplying water/laying of petroleum gas/gas flue/pipeline such as cable, communication line, reparation and replacing can be widely used in, there is advantages such as not affecting traffic, not welding, short construction period, integrated construction cost is low, social benefit is remarkable.
Under normal circumstances, first Technology of Directional Drilling is adopted to creep into a pilot hole, be less than the pipeline to be laid of reamer subsequently at the large diameter reamer of rear end changing-over of drill string and diameter, while reaming of pulling back, pipeline together drawn in boring, complete the pipelaying work under no-dig technique condition.For carry out in Rock And Soil no-dig technique condition underground pipelines lay pull back reaming time, at present conventional reamer (or being called reaming bit) comprises paddle reaming bit, helical counterbore drill bit, groove-like reaming bit, cutter reaming bit, shaft-like reaming bit, two-way spindle reaming bit, particle size drilling tool shape reaming bit, cutting ring shape reamer are first-class, and they are mainly using carbide alloy as the cutting element of drill bit; The reaming drilling method of current employing, mainly to rely on rig to drive drilling tool pivotal mode to carry out ream operation, the Cutting Rock ability of the reaming drilling efficiency that the method obtains and existing reamer is all limited.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of reamer and pulls back reaming assembly and reaming drilling method thereof, solves the deficiencies in the prior art.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of reamer, and it comprises the drill body of through, and the middle part of described drill body is circumferentially provided with multiple cutting unit be evenly distributed on outside described drill body; Be provided with for the continuous skewed through hole having mud jacking liquid to discharge circulated by described drill body inside between adjacent described cutting unit; The port of export build-in of a described through hole is had at least to have Cavitation jet nozzle; Described cutting unit comprises cutting element, steel body and impregnated with diamond bar; Described steel body is fixed on the periphery outside described drill body; Described cutting element build-in is on described steel body; Described impregnated with diamond bar is arranged on the outside of described steel body.
The invention has the beneficial effects as follows: between the cutting unit that every two circumferences are adjacent, be provided with a Cavitation jet nozzle, the continuous flushing liquor circulated can the cavitation jet of forming energy Relatively centralized after Cavitation jet nozzle outlet at a high speed (being greater than 40m/s) ejection under the effect of certain pump pressure (being greater than 10MPa), can effectively realize the cutting of Rock And Soil broken by assisted machining unit, thus the operating efficiency that lifting reaming is crept into.
Further: described Cavitation jet nozzle and described through hole one-body molded, or described Cavitation jet nozzle by the fixed form build-in of screw thread, welding or interference fit in described through hole port of export place.
Further: the middle part of described Cavitation jet nozzle inner chamber is provided with shoulder hole, and the port of export of described Cavitation jet nozzle is provided with horn mouth.
Further: the angle between the axis of described through hole and the axis of described drill body is 30 ° to 60 °.
Further: the inner position on the lower side of described drill body is provided with the bottom liquid islocation plate for intercepting central passage; One end of described drill body is provided with the screw thread for connecting impactor; The other end of described drill body is provided with the screw thread for being connected with transfer gear, drill string or finished product pipeline.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: one is pulled back reaming assembly, and it comprises impactor, sealing liquid joint and above-mentioned reamer; One end of described reamer is connected by thread seal with between described impactor, and the other end of described reamer is connected by thread seal with described sealing liquid joint.
The invention has the beneficial effects as follows: utilize the present invention implement in Rock And Soil no-dig technique condition underground pipelines lay pull back reaming time, the efficient revolution Cutting Rock formula reaming that simultaneously can realize torsion impact device associating reamer is crept into, or the impact rotating detritus formula reaming of hydraulic impacter associating reamer is crept into, the Alternative reaming drilling method of simultaneously assisting detritus to be coupled with cavitation jet spray at a high speed from Cavitation jet nozzle, can effectively promote the present invention implement in Rock And Soil the laying of no-dig technique condition underground pipelines pull back reaming time operating efficiency.
Further: described impactor is torsion impact device or hydraulic impacter.
Further: the middle part of described sealing liquid joint inner chamber is provided with has mud jacking liquid and the middle part liquid islocation plate also upwards can accumulated in the central passage inner product accumulation of energy of reamer for shutoff.
Further: described sealing liquid joint is provided with the screw thread for being connected with transfer gear, drill string or finished product pipeline away from one end of described reamer.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of reaming drilling method of reaming assembly of pulling back, its use above-mentioned pull back reaming assembly time, need to provide in reamer constantly circulate in direct circulation mode have mud jacking liquid; Described slurries are low solid phase or unfixed phase slurry.
The invention has the beneficial effects as follows: utilize the present invention implement in Rock And Soil no-dig technique condition underground pipelines lay pull back reaming time, the efficient revolution Cutting Rock formula reaming that simultaneously can realize torsion impact device associating reamer is crept into, or the impact rotating detritus formula reaming of hydraulic impacter associating reamer is crept into, the Alternative reaming drilling method of simultaneously assisting detritus to be coupled with cavitation jet spray at a high speed from Cavitation jet nozzle, can effectively promote the present invention implement in Rock And Soil the laying of no-dig technique condition underground pipelines pull back reaming time operating efficiency.
Accompanying drawing explanation
Fig. 1-1 pulls back when being and connecting torsion impact device the threedimensional model schematic diagram of reaming assembly integral;
Fig. 1-2 pulls back when being and connecting hydraulic impacter the threedimensional model schematic diagram of reaming assembly integral;
Fig. 2-1 pulls back when being and connecting torsion impact device the threedimensional model schematic diagram that each isolation of components of reaming assembly comes;
Fig. 2-2 pulls back when being and connecting hydraulic impacter the threedimensional model schematic diagram that each isolation of components of reaming assembly comes;
Fig. 3-1 is that the threedimensional model axle of reamer body part measures intention;
Fig. 3-2 is the threedimensional model elevation of reamer body part;
Fig. 3-3 is the threedimensional model sectional view of reamer body part;
Fig. 3-4 is the threedimensional model sectional view of reamer body part in the second embodiment;
Fig. 4-1 is that the threedimensional model axle of Cavitation jet nozzle measures intention;
Fig. 4-2 is the threedimensional model sectional view of Cavitation jet nozzle;
Fig. 5-1 forms complete reamer threedimensional model axle to measure intention after build-in Cavitation jet nozzle;
Fig. 5-2 forms complete reamer threedimensional model sectional view after build-in Cavitation jet nozzle;
Fig. 5-3 is the reamer threedimensional model sectional view forming the second complete embodiment after build-in Cavitation jet nozzle;
Fig. 6-1 is that the threedimensional model axle of sealing liquid joint measures intention;
Fig. 6-2 is the threedimensional model sectional view of sealing liquid joint;
Fig. 7 is the threedimensional model sectional view after reamer is connected with sealing liquid joint.
In accompanying drawing, the parts representated by each label are as follows:
1, torsion impact device; 2, hydraulic impacter 3, reamer; 4, sealing liquid joint; 31, upper end connecting thread; 32, cutting unit; 321, cutting element; 322, steel body; 323, impregnated with diamond bar; 33, through hole; 34, lower end connecting thread; 35, Cavitation jet nozzle; 351, liquid flow inlet; 352, fluid outlet; 36, bottom liquid islocation plate; 41, upper screw thread; 42, middle part liquid islocation plate; 43, lower screw thread.
Detailed description of the invention
Be described principle of the present invention and feature below in conjunction with accompanying drawing, example, only for explaining the present invention, is not intended to limit scope of the present invention.
First embodiment:
As shown in Fig. 3-1, Fig. 3-2, Fig. 3-3, Fig. 5-1, Fig. 5-2, reamer 3 is the main tool of cutting the kata-rocks soil body, it comprises the drill body of through, and the middle part of described drill body is circumferentially provided with multiple cutting unit 32 be evenly distributed on outside described drill body; The skewed through hole 33 having mud jacking liquid to discharge for constantly being circulated described drill body inside is provided with between adjacent described cutting unit 32, one end of described through hole 33 is communicated with the central passage of described drill body inside, and the other end of described through hole 33 is communicated with the outside of described drill body; Cutting unit 32 and through hole 33 are circumferentially distributed on described drill body.Described in several, the port of export build-in of through hole 33 has Cavitation jet nozzle 35, for Cavitation jet nozzle 35 mentioned in the present invention, is not limited to the structure of Cavitation jet nozzle, also can uses other nozzle arrangements that can produce high-pressure spray and patterns.The top of drill body is provided with upper end connecting thread 31, and bottom is provided with lower end connecting thread 34.
As shown in figure 3-1, cutting unit 32 is the primary structures cutting Rock And Soil arround broken hole wall, it is by cutting element 321, steel body 322 and impregnated with diamond bar 323 are formed, described steel body 322 is fixed on the periphery outside described drill body, cutting element 321 build-in forms the main body of cutting unit in steel body 322, due to when normal reaming is crept into, rig provides clockwise rotary torque usually, thus drilling tool pivotal direction when the arrangement mode of the cutting element 321 of the present invention's employing depends on that reaming is crept into, namely the front (cutting face) of cutting element 321 is towards should be consistent with the pivotal direction of rig.Impregnated with diamond bar 323 is mounted in the gauge of outside for holing of steel body 322.The described cutting element 321 that the present invention adopts adopts PDC material to make, but is not limited to this, and other material being suitable for cutting the kata-rocks soil body such as CBN, Si Lawujiqi, TSP, PCD also can be adopted to make.Described steel body 322 and described drill body that the present invention simultaneously adopts can adopt integrated formed structure.
As shown in Fig. 3-3, through hole 33 is laid between two adjacent cutting units 32 equably, and in the through shape inclined hole of 30 ° to 60 °, the number of through hole 33 is consistent with the number of cutting unit 32.
As shown in Fig. 4-1, Fig. 4-2, the middle part of Cavitation jet nozzle 35 inner chamber is provided with shoulder hole, and the port of export of Cavitation jet nozzle 35 is provided with horn mouth.Cavitation jet nozzle 35 by the mode build-in of screw thread, welding or interference fit in the port of export place of through hole 33, also can described Cavitation jet nozzle 35 one-body molded with described through hole 33.The number of Cavitation jet nozzle 35 is consistent with the number of through hole 33.Rig provide a whole set of drilling tool rotary torque and pull back reaming the pressure of the drill time, reamer 3 turn round at a high speed and cuts Rock And Soil arround broken hole wall and realizes reaming and creep under the drive of drill string, while the mud jacking liquid that has that constantly circulates in direct circulation mode (preferably adopt low solid phase or unfixed phase slurry.Wherein, the low solids mud: refer to clay content (by weight) < 10%, or refer to the mud of clay content (by volume) < 4%; Unfixed phase slurry: refer to and do not add clay, only by the dispersion of organic high molecular polymer and water mixed preparing.) flow into its inner chamber from the liquid flow inlet 351 of some Cavitation jet nozzle 35, and form cavitation jet by the ejection of fluid outlet 352 high speed, can to will be broken hole wall arround Rock And Soil carry out the fragmentation of (in advance) erosion in advance, carry out reaming creep into realize auxiliary reamer 3, effectively can promote the operating efficiency carrying out when reaming is crept into Rock And Soil.
As shown in Fig. 1-1, Fig. 1-2, Fig. 2-1, Fig. 2-2, the invention still further relates to one to pull back reaming assembly, according to contrary with the direction that reaming creeps into will be implemented, successively by torsion impact device 1 or hydraulic impacter 2, above-mentioned reamer 3 (adopting the reamer 3 of the first embodiment), and sealing liquid joint 4 forms, connected by thread seal between them, when using the reaming of pulling back in the invention process non-excavation laying pipeline construction process to creep into, slurries adopt the mode of direct circulation.Particularly, the top of reamer 3 is connected with torsion impact device 1 or hydraulic impacter 2 by upper end connecting thread 31.
If connect torsion impact device 1 to implement no-dig technique pipe installation reaming of pulling back and creep into, then torsion impact device 1 can be the additional impact twisting force that a whole set of drilling tool continues to provide consistent with drilling tool gyratory directions, its upper end is connected with drill string by screw thread, lower end is connected with reamer 3 by screw thread, so just can pull back in process that reaming creeps into and make reamer 3 when being provided by rig power to drive a whole set of drilling tool to turn round and reaming of pulling back is crept into implementing no-dig technique pipe installation, be continuously it and extra additional impact twisting force is provided, not only effectively can strengthen the revolution Cutting Rock effect of reamer 3, in addition the power consumption of rig can also be reduced.
If connect hydraulic impacter 2 to implement no-dig technique pipe installation reaming of pulling back and creep into, then hydraulic impacter 2 can be the reciprocating impact load that a whole set of drilling tool provides axial, its upper end is connected with drill string by screw thread, lower end is connected with reamer 3 by screw thread, so just mode can be crept into implementing the no-dig technique pipe installation reaming realizing impact rotating detritus in process that reaming creeps into of pulling back, can make effectively to be promoted the reaming drilling efficiency of pulling back of rock, also can play the effect of drill pipe release simultaneously to a certain extent.
As shown in Fig. 6-1, Fig. 6-2, Fig. 7, sealing liquid joint 4 is the parts connecting reamer 3 and transfer gear, drill string (or finished product pipeline), and it forms primarily of upper screw thread 41, middle part liquid islocation plate 42 and lower screw thread 43.Its top is connected with the lower end connecting thread 34 of reamer 3 by upper screw thread 41; Middle part is middle part liquid islocation plate 42, for shutoff implement no-dig technique pipe installation pull back constantly circulate in a whole set of drilling tool when reaming is crept into have mud jacking liquid, enable mud jacking liquid continuous savings energy upwards accumulating in the central passage of reamer 3, thus mud jacking liquid is flowed in Cavitation jet nozzle 35 along some through holes 33 form cavitation jet; Bottom is connected with transfer gear, drill string (or finished product pipeline) etc. by lower screw thread 43, if transfer gears etc. are not adopt the mode be threaded, then by connecting a suitable switch transition joint for connecting transfer gear etc. at lower screw thread 43 place.
The whole series pull back the revolution of reaming assembly with the power resources of reaming of pulling back in the rig being placed on earth's surface, if what connect is torsion impact device 1, then flow into torsion impact device 1 by the mud jacking liquid that has of slush pump pumping along drill string central passage, drive the work of torsion impact device 1 to provide to continue and the additional impact twisting force consistent with drilling tool gyratory directions, can be reamer 3 is being provided power to drive a whole set of drilling tool to turn round and while reaming of pulling back creeps into by rig, be continuously it and extra additional impact twisting force is provided, not only effectively can strengthen the revolution Cutting Rock effect of reamer 3, the power consumption of rig can also be reduced simultaneously, if what connect is hydraulic impacter 2, then flow into hydraulic impacter 2 by the mud jacking liquid that has of slush pump pumping along drill string central passage, the block stamp of hydraulic impacter 2 is driven to move back and forth vertically, thus constantly apply shock loading in the upper end of reamer 3, creep into realize carrying out reaming to rock arround hole wall in the mode of impact rotating detritus, can make effectively to be promoted the reaming drilling efficiency of rock, also can play the effect of drill pipe release simultaneously to a certain extent.
Rig drives a whole set of reaming assembly of pulling back turn round at a high speed and apply the pressure of the drill be suitable for when reaming is crept into of pulling back, and the reaming that the some cutting elements 321 be now laid on reamer 3 Rock And Soil constantly turned round arround the broken hole wall of cutting realizes under revolution Cutting Rock mode is crept into.Mud jacking liquid is had to flow to the central passage of reamer 3 until intercepted by middle part liquid islocation plate 42 after arriving at sealing liquid joint 4, what constantly circulate has the constantly savings energy also upwards accumulation in the central passage of reamer 3 of mud jacking liquid simultaneously, its inner chamber is flowed into from the liquid flow inlet 351 of some Cavitation jet nozzle 35 along some through holes 33, and form cavitation jet by the ejection of fluid outlet 352 high speed, (in advance) erosion in advance can be carried out broken to the Rock And Soil arround hole wall, carry out reaming creep into realize auxiliary reamer, effectively can promote no-dig technique pipe installation to pull back the operating efficiency of reaming when creeping into.
Be integrated with torsion impact device 1 provide additional impact torsion or hydraulic impacter 2 to provide the effect of reciprocating impact load under reamer 3, the reaming of pulling back that both can realize turning round efficiently under Cutting Rock mode is crept into, the reaming of pulling back that also can realize under impact rotating detritus mode is crept into, be aided with cavitation jet advanced (in advance) erosion fragmentation to Rock And Soil arround hole wall simultaneously, namely the Alternative that the present invention can realize under the effect of being coupled of above-mentioned various ways is simultaneously pulled back reaming drilling method, with this understanding, along with reaming of pulling back constantly is carried out with creeping into, be connected to the transfer gear at sealing liquid joint 4 rear portion, drill strings (or finished product pipeline) etc. are by simultaneously along with rig drives a whole set of the present invention reaming of pulling back creep into and complete the pipe installation under no-dig technique condition along the drilling track be drilled to.
Second embodiment:
As shown in Fig. 3-4, Fig. 5-3, for the present invention's another kind of non-excavation laying pipeline reamer structural representation, reamer 3 overall structure in second embodiment is substantially identical with the reamer 3 in the first embodiment, difference is, the inner position on the lower side of drill body is provided with the bottom liquid islocation plate 36 for intercepting its central passage.Like this when using the reamer 3 of the present embodiment, without the need to external sealing liquid joint 4, directly connect transfer gear, drill string (or finished product pipeline) etc. by lower end connecting thread 34.
According to the second embodiment, present invention also offers the another kind of reaming assembly of pulling back laid for no-dig technique condition underground pipelines, it comprises impactor and reamer 3 (adopting the reamer 3 of the second embodiment); Be tightly connected by upper end connecting thread 31 between one end of described reamer 3 and described impactor, the other end of described reamer 3 connects transfer gear, drill string (or finished product pipeline) etc. by lower end connecting thread 34.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. a reamer, is characterized in that: the drill body comprising through, and the middle part of described drill body is circumferentially provided with multiple cutting unit be evenly distributed on outside described drill body; Be provided with for the continuous skewed through hole having mud jacking liquid to discharge circulated by described drill body inside between adjacent described cutting unit; The port of export build-in of a described through hole is had at least to have Cavitation jet nozzle;
Described cutting unit comprises cutting element, steel body and impregnated with diamond bar; Described steel body is fixed on the periphery outside described drill body; Described cutting element build-in is on described steel body; Described impregnated with diamond bar is arranged on the outside of described steel body.
2. a kind of reamer according to claim 1, is characterized in that: described Cavitation jet nozzle and described through hole one-body molded, or described Cavitation jet nozzle by the fixed form build-in of screw thread, welding or interference fit in described through hole port of export place.
3. a kind of reamer according to claim 1, is characterized in that: the middle part of described Cavitation jet nozzle inner chamber is provided with shoulder hole, and the port of export of described Cavitation jet nozzle is provided with horn mouth.
4. a kind of reamer according to claim 1, is characterized in that: the angle between the axis of described through hole and the axis of described drill body is 30 ° to 60 °.
5. a kind of reamer according to any one of Claims 1-4, is characterized in that: the inner position on the lower side of described drill body is provided with the bottom liquid islocation plate for intercepting its central passage; One end of described drill body is provided with the screw thread for connecting impactor; The other end of described drill body is provided with the screw thread for being connected with transfer gear, drill string or finished product pipeline.
6. to pull back a reaming assembly, it is characterized in that: comprise impactor, sealing liquid joint and the reamer as described in any one of Claims 1-4; One end of described reamer is connected by thread seal with between described impactor, and the other end of described reamer is connected by thread seal with described sealing liquid joint.
7. one is pulled back reaming assembly according to claim 6, it is characterized in that: described impactor is torsion impact device or hydraulic impacter.
8. one is pulled back reaming assembly according to claim 6, it is characterized in that: being provided with in the middle part of the inner chamber of described sealing liquid joint has mud jacking liquid for shutoff and can in the central passage inner product accumulation of energy of reamer and the middle part liquid islocation plate upwards accumulated.
9. one is pulled back reaming assembly according to claim 6, it is characterized in that: described sealing liquid joint is provided with the screw thread for being connected with transfer gear, drill string or finished product pipeline away from one end of described reamer.
10. to pull back the reaming drilling method of reaming assembly, it is characterized in that: use when to pull back reaming assembly described in any one of claim 6 to 9, need to provide in reamer constantly circulate in direct circulation mode have mud jacking liquid; Described slurries are low solid phase or unfixed phase slurry.
CN201510098453.7A 2015-03-05 2015-03-05 One kind is pulled back reaming assembly and its reaming drilling method Active CN104763338B (en)

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CN111535742A (en) * 2020-05-12 2020-08-14 中建六局水利水电建设集团有限公司 Low-resistance directional drilling and crossing construction method for PE pipeline

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CN111535742A (en) * 2020-05-12 2020-08-14 中建六局水利水电建设集团有限公司 Low-resistance directional drilling and crossing construction method for PE pipeline

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