CN108868611A - Drilling method for correcting error and its deviation correcting device based on casing follow-up - Google Patents
Drilling method for correcting error and its deviation correcting device based on casing follow-up Download PDFInfo
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- CN108868611A CN108868611A CN201810833302.5A CN201810833302A CN108868611A CN 108868611 A CN108868611 A CN 108868611A CN 201810833302 A CN201810833302 A CN 201810833302A CN 108868611 A CN108868611 A CN 108868611A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/10—Correction of deflected boreholes
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Abstract
The present invention relates to earth drilling technical field of construction, disclose a kind of drilling method for correcting error and deviation correcting device based on casing follow-up.The present invention changes the amount of force that stratum in drilling process turns to selection face to casing end, by adjusting the front and back relative position between the adaptable casing of drill bit and outside to adjust the jacking direction of casing.The configuration of the present invention is simple, correction precision is high, and it is convenient to operate.
Description
Technical field
The present invention relates to earth drilling technical field of construction, more particularly to a kind of drilling correction side based on casing follow-up
Method and its deviation correcting device.
Background technique
Drilling is that one of the technique that the constructions such as surrounding rock consolidation, sealing are often related to is carried out in underground space construction.It is drilling
In the process, often due to the reasons such as geological conditions, bore process, borehole accuracy are difficult to ensure.When making a call to 20 meters or more of deep hole, bore
Bar easily generates direction change under self gravitation effect and the inhomogeneities and variability effect of country rock, causes drilling direction inclined
From design direction, hole quality is influenced, while will cause drilling rod and the increasing of drill hole inner wall frictional resistance, cause drilling difficult and damaging
Hurt drilling rod or drill bit.
In boring procedure when actual borehole track and design drilling track deviate when, frequently with drilling deviation correcting technology into
Row correction.At present in construction, the deviation correcting technology of most-often used casing follow-up is generally located on using the correction plate with wedge shape
Interior drilling rod front end adjusts the direction of wedge shape correction plate, directly jacking is rectified a deviation forward to realize, in certain situation by stopping rotating
There is down good rectifying effect.The disadvantage is that drilling tool can not rotate unearthed when correction, it is easy to cause unsmooth, the drilling machine torque that is unearthed
Increase that drill bit is caused to deform, increases equipment loss.
In the follow-up construction of non-casing, there are also the front ends that wedge shape correction plate is set up directly on to jacking drilling rod, rectify a deviation
When, clapboard direction is adjusted by rotation drilling rod and is rectified a deviation.
Above scheme is required to determine the direction of wedge shape correction plate before correction, and determines the direction needs of wedge shape correction plate
Installation is capable of measuring the sensor of tool angle, and is passed to tool angle outside hole by wired or wireless mode.
Summary of the invention
It is simple that the present invention provides a kind of structure, and correction precision is high, and it is convenient to operate, not will increase drilling tool loss based on casing
Drilling deviation correcting device and its method for correcting error.
The technical issues of solution is：Existing wedge shape correction plate is arranged in chisel edge, will lead to the unsmooth, drilling machine that is unearthed
Torque increases that drill bit is caused to deform, and increases equipment loss；And wedge shape correction plate direction must be determined by angular transducer.
In order to solve the above technical problems, the present invention adopts the following technical scheme that：
The present invention is based on the drilling method for correcting error of casing, opposite by adjusting the front and back between drill bit and the casing that outside is adapted
Position changes the amount of force that stratum in drilling process turns to selection face to casing end, to adjust the jacking direction of casing.
The present invention is based on the drilling method for correcting error of casing further to specifically include following situations：
For the actual borehole direction Y of drilling relative to design boring direction X, offset direction is the direction A, and the steering of casing is made to select face
Towards the direction the A side of drilling；
Situation one turns to selection surface rear end when drill bit is fully located at casing, and between chisel edge and steering selection surface rear end
Selection face earth layer in front is turned to when distance is greater than 1-1.5 times of sleeve outer, in drilling process to the active force in the selection face of steering
Maximum, maximum to the adjustment effect of dilling angle, the opposite direction deflection speed in drilling direction to the direction A is most fast；
Situation two turns to selection surface rear end and apart from turning to the sleeve outer for selecting 1-1.5 times of surface rear end from being located at when drill bit
Position move forward, gradually close to turn to selection face rear end when, drill bit to turn to selection face near stratum generate loosening, bore
It is gradually reduced into active force of the stratum in the process to the selection face of steering, the adjustment effect of dilling angle is gradually reduced, is crept into A
The deflection speed of the opposite direction in direction reduces；
Situation three turns to selection when drill bit gradually moves forward to flush or exceed with the selection face of steering from steering selection surface rear end
It is zero that stratum, which selects the active force in face to steering, when holding in front, in drilling process, turns to selection and faces the change of drilling direction not
Generation effect.
The present invention is based on the drilling method for correcting error of casing, and further, casing end is additionally provided with the maintenance face of steering, specifically
Including following situations：
When actual borehole direction Y relative to design boring direction X, offset direction be the direction B, make casing steering select facing towards
The direction B of drilling turns to and maintains facing towards the C direction contrary with B；
1., when drill bit is fully located at casing situation turns to selection surface rear end, and between chisel edge and steering selection surface rear end
When distance is greater than 1-1.5 times of sleeve outer, turns to selection face and steering maintenance face and completely attached to stratum, and turn to selection
Stratum at face is not disturbed by drill bit, and stratum is maximum to the active force in the selection face of steering in drilling process, turns to selection in face of side
To the adjustment effect of Y much larger than the maintenance face of steering, adjusts direction Y and be intended to the deflection of the direction C；
2., when drill bit situation turns to selection surface rear end and apart from turning to the sleeve outer for selecting 1-1.5 times of surface rear end from being located at
When position moves forward, gradually approaches the rear end in the selection face of steering, drill bit is to steering selection face place ground disturbance in drilling process
It incrementally increases, stratum is gradually reduced the active force in the selection face of steering, turns to maintenance face and completely attaches to always with stratum, turns to dimension
The deflection adjustment effect held in face of direction Y is gradually increased；
3., when drill bit gradually moves forward to flush or exceed with the selection face of steering from steering selection surface rear end situation turns to selection
When holding in front, drill bit directly takes the soil body near the selection face of steering out of when drilling, stratum to steering select the active force in face for
Zero, selection is turned in face of the change of drilling direction and does not generate effect, is turned to maintenance face and is completely attached to always with stratum, only turns to
Maintenance face adjusts direction Y and is intended to the deflection of the direction B.
Deviation correcting device of the present invention, the casing including drill bit and on the outside of drill bit；The elastic movement of drill bit facing sleeve；
The selection face of steering is provided at the front end nozzle of casing, the selection face of steering is located at the side of casing nozzle, and towards in casing
Mandrel direction.
Deviation correcting device of the present invention is further provided with correction plate on the side side wall of the front end nozzle of described sleeve pipe, entangles
The medial surface fitting of inclined plate one end is arranged on sleeve side walls, and the other end extends horizontally outward, stretches out the correction plate of casing nozzle
Medial surface formed turn to selection face.
Deviation correcting device of the present invention, further, the front end nozzle of described sleeve pipe are oblique nozzle, the steering selection face position
Below the tip that oblique nozzle forward extends out.
Deviation correcting device of the present invention, further, the tip of the oblique nozzle are provided with cambered plate, the fitting of cambered plate one end
Be arranged on casing wall, the other end extends horizontally outward, stretch out the cambered plate of oblique nozzle medial surface and oblique nozzle tip
Medial surface be collectively formed turn to selection face.
Deviation correcting device of the present invention, further, it is described turn to selection face along jacking direction, towards far from casing central axis
Direction is obliquely installed.
Deviation correcting device of the present invention is further additionally provided with the maintenance face of steering above the tip of the oblique nozzle, described
The maintenance face of steering is located above the selection face of steering, is obliquely installed along jacking direction, towards the central axial direction of casing.
Deviation correcting device of the present invention, further, the central axis of the casing edge of the oblique nozzle tip towards casing
Direction, obliquely outward formation maintain inclined plate, maintain the outside inclined-plane of inclined plate to turn to maintenance face, maintain to incline below inclined plate
It tiltedly is provided with selection baffle, selects the outside inclined-plane of baffle to turn to selection face；It selects baffle one end edge and turns to maintenance face
End face connection, the other end extends obliquely downward and pass through the inner sidewall connection of connecting plate and casing.
Deviation correcting device of the present invention, further, the area for turning to selection face are greater than the area in the maintenance face of steering.
Deviation correcting device of the present invention, further, the angle between the selection baffle and cannula center axis, which is greater than, to be maintained
Angle between inclined plate and cannula center axis.
The present invention is based on the drilling deviation correcting devices of casing compared with prior art, has the advantages that：
Present invention drilling deviation correcting device structure is simple, angle control structure is arranged in casing front end, by adjusting drill bit and casing
Front and back relative positional relationship, to adjust the angle the amount of force of control structure, to realize correction to boring direction, nothing
It need to stop creeping into, will not influence unearthed, the jacking resistance at drill bit position will not be increased suddenly, not will cause drill bit or casing
Deformation, do not need yet measurement drill bit tool angle.
Present invention drilling deviation correcting device monitors actual drilling direction in real time and adjusts drill bit after discovery drilling direction offset
It is flexible, change the soil body to be cut or stratum to the amount of force in the steering selection face in angle control structure, and then change and turn
To selection face and the controlling extent maintained in face of deflection direction is turned to, operates convenient and efficient, correction precision is high.
When the oblique nozzle of the present invention is cammed surface, cambered plate is set above long mouth end, the selection face of steering can be increased
Practical function area, and the intensity at set pipe range mouth end can be increased, avoid it from damaging or deform in jack-in process.
The present invention drills, and method for correcting error is simple to operation, and flexibly, applied widely, controllability is strong, avoids traditional
The method that correction is realized by tube enormously simplifies the process of correction, it is ensured that the normal deslagging during rectifying a deviation, simultaneously
Avoid the loss to correction to drilling tool.
The drilling deviation correcting device to of the invention based on casing and its method for correcting error are described further with reference to the accompanying drawing.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the drilling deviation correcting device of embodiment 1；
Fig. 2 is the cannula structure schematic diagram in embodiment 2；
Fig. 3 is the drilling correction process schematic of embodiment 2；
Fig. 4 is the structural schematic diagram of the drilling deviation correcting device of embodiment 3；
Fig. 5 is the drilling correction process schematic of embodiment 3.
Appended drawing reference：
1- drill bit；2- casing；3- turns to selection face；31- correction plate；32- cambered plate；4- turns to maintenance face；41- maintains inclined plate；
42- selects baffle；43- connecting plate.
Specific embodiment
Embodiment 1
According to somewhere soil layer hole to be drilled and soil analysis, soil property is layer of sand；According to existing engineering construction experience, clearly by
Arenaceous stratum influences, and boring direction is easier to deflect to a direction, then using drilling deviation correcting device described in the present embodiment, choosing
It is drilled with screw conveyor drilling rod according to following method for correcting error.
As shown in Figure 1, including drill bit 1 the present invention is based on the drilling deviation correcting device of casing follow-up, and it is located at 1 outside of drill bit
Casing 2, the size of the caliber of casing 2 and drill bit 1 is adapted, the elastic movement of 1 facing sleeve of drill bit 2；The front end of casing 2
It is provided at nozzle and turns to selection face 3, turned to selection face 3 and be located at the side of 2 nozzle of casing, and towards the central axis of casing 2
Direction, the caliber of casing 2 and the size of drill bit 1 are adapted.
In the present embodiment, drill bit 1 is fixedly connected by drilling rod with telescopic oil cylinder, and tail end and the top-pushing mechanism of casing 2 are fixed
Connection, telescopic oil cylinder are arranged at top-pushing mechanism rear；Drill bit 1 and the common jacking forward under the promotion of top-pushing mechanism of casing 2 are bored
First 1 under the action of telescopic oil cylinder 2 stretching motion of facing sleeve, adjust drill bit 1 and casing 2 relative position.
The front end nozzle of casing 2 is conventional flat mouth nozzle, and correction plate 31 is provided on the side wall of one side, plate 31 of rectifying a deviation
Inner surface be arranged in cambered surface, the medial surface fitting of correction 31 one end of plate is arranged on 2 side wall of casing, and setting is in inner sidewall or outer
On side wall, the other end extends horizontally outward, and the medial surface for stretching out the correction plate 31 of 2 nozzle of casing, which is formed, turns to selection face 3.
The corresponding central angle of plate 31 of rectifying a deviation is no more than 60 °.
Embodiment 2
Stratum is sand-pebble layer, according to existing engineering construction experience, is clearly influenced by sand-pebble layer, horizontal drilling side
To being easier to upward deflect, down-hole hammer tup is selected, the distinctive points on deviation correcting device are：
As shown in Fig. 2, the oblique nozzle of 2 front end of casing, tip is provided with cambered plate 32, and the fitting setting of 32 one end of cambered plate exists
On 2 wall of casing, the other end extends horizontally outward, stretches out the interior of the medial surface of the cambered plate 32 of oblique nozzle and oblique nozzle tip
Side, which is collectively formed, turns to selection face 3.
The corresponding central angle of cambered plate 32 is no more than 60 °.
The deviation correcting device that embodiment 1 and embodiment 2 are recorded, is applied in the drilling method for correcting error to follow up the present invention is based on casing
In, by adjusting drill bit and the relative position being arranged between the casing on the outside of drill bit, change drill bit to stratum or the cutting soil body
Perturbation action, thus change stratum or cut the soil body to casing end steering selection face active force, adjust deviation correcting device
Jacking angle.
First according to stratum soil analysis and micro-judgment, determine that the actual borehole direction Y of drilling drills relative to design
Direction X can be deviated to the direction A, be adjusted the direction of deviation correcting device, make steering A direction of the selection face 3 towards drilling of casing, such as
Shown in Fig. 3；
Such as：When setting horizontal drilling, it is known that drilling be easy upwards inclination, then by the short mouth end of casing be placed in drilling just on
Side, long mouth end is placed in the underface of drilling；
Following several situations are specifically included in drilling process：
Situation one, when drill bit 1 be fully located at casing 2 turn to 3 rear end of selection face and 1 front end of drill bit and turn to 3 rear end of selection face it
Between distance when being greater than 1-1.5 times of 2 outer diameter of casing, 1 position of drill bit absolutely not disturbs the soil body at steering selection face 3
Effect, and turn to selection face 3 and contacted completely with stratum always, therefore turn to stratum at selection face 3 in drilling process and steering is selected
The active force for selecting face 3 is maximum, opposite direction deflection speed from drilling direction to A direction also maximum to the adjustment effect of dilling angle
It is most fast.
It is mentioned herein that " the distance between 1 front end of drill bit and steering 3 rear end of selection face are greater than outside 1-1.5 times of casing 2
The distance of diameter " is the perturbation action for having fully considered drill bit 1 and having generated in drilling process to the ground layer soil body in front of drilling, meeting
The neighbouring soil body is set to generate loosening, even if there are no the soil disturbance regions of jacking to front for drill bit 1, but the soil body pair loosened
The resistance that jacking device generates has reduced, and by the multiple authentication to various embodiments structure of the present invention, determines in drill bit 1
It is effective soil disturbance region in the range of 2 outer diameter of casing of 1-1.5 times of front end.
Situation two turns to 3 rear end of selection face and apart from the set of 1-1.5 times of 3 rear end of the selection face of steering from being located at when drill bit 1
The position of 2 outer diameter of pipe moves forward, gradually close to the rear end for turning to selection face 3 when, drill bit 1 is gradually to turning near selection face 3
Stratum form a degree of loosening, stratum is turned at selection face 3 in drilling process to turning to the active force in selection face 3 gradually
Reduce, the adjustment effect of dilling angle is gradually reduced, creeps into the deflection speed of the opposite direction in the direction A and reduce.
Situation three turns to selection face when drill bit gradually moves forward to flush or exceed with nozzle from steering selection surface rear end
When front end, drill bit 1 directly takes the soil body turned near selection face 3 out of when drilling, turns to the contact in selection face 3 with the cutting soil body
Area is zero, and it is zero that stratum, which selects the active force in face to steering, in drilling process, turns to selection and faces the change of drilling direction not
Generation effect.
The flexible adjustment of drill bit 1 is carried out according to the adjusting trend of above-mentioned active force for the actual deflection situation of drilling,
It realizes the correction of drilling direction, completes drilling.
Embodiment 3
When certain stratum hole to be drilled and complex soil structure, for example layer of sand；Then entangled using drilling described in the present embodiment
Deflection device selects three wings drill bit to drill according to following method for correcting error.
As shown in figure 4, including drill bit 1 the present invention is based on the drilling deviation correcting device of casing follow-up, and it is arranged outside drill bit 1
The casing 2 of side, the caliber of casing 2 and the size of drill bit 1 are adapted, the elastic movement of 1 facing sleeve of drill bit 2, the pipe of casing 2
The size of diameter and drill bit 1 is adapted；It is provided at the front end nozzle of casing 2 and turns to selection face 3 and steering maintenance face 4, turn to choosing
Select the side that face 3 is located at 2 nozzle of casing, and towards the central axial direction of casing 2；Selection face 3 is turned to along jacking direction, Xiang Yuan
Central axial direction from casing 2 is obliquely installed, and is directly contacted with the soil body of the oblique inside in jacking direction；Maintenance face 4 is turned to be located at
3 top of the selection face of steering, is obliquely installed along jacking direction, towards the central axial direction of casing 2, with the oblique outside in jacking direction
The soil body directly contacts.In the present embodiment, drill bit 1 is fixedly connected by drilling rod with telescopic oil cylinder, the tail end and top-pushing mechanism of casing 2
It is fixedly connected, telescopic oil cylinder is arranged on top-pushing mechanism；Drill bit 1 and the common jacking forward under the promotion of top-pushing mechanism of casing 2,
2 stretching motion of facing sleeve under the action of telescopic oil cylinder of drill bit 1 adjusts the relative position of drill bit 1 and casing 2.
The central axial direction of casing edge towards the casing 2 of oblique nozzle tip tilts and extends outward to form maintenance tiltedly
Plate 41, maintaining the outside inclined-plane of inclined plate 41 is to turn to maintenance face 4, and the angle between maintenance inclined plate 41 and 2 central axis of casing is not
More than 3 °, central angle corresponding to inclined plate 41 is maintained to be not less than 15 °；The inclined downward of inclined plate 41 is maintained to be provided with selection baffle
42, the outside inclined-plane of baffle 42 is selected to turn to selection face 3；It selects 42 one end edge of baffle and turns to the end face company in maintenance face 4
It connects, the other end extends obliquely downward and passes through connecting plate 43 and connect with the inner sidewall of casing 2, and connecting plate 43 is obliquely installed；Selection
8 ° -30 ° of angle between 2 central axis of baffle 42 and casing are advisable, and select the angle between baffle 42 and 2 central axis of casing
Greater than the angle maintained between inclined plate 41 and 2 central axis of casing, or the area in selection face 3 is turned to greater than steering maintenance face 4
Area.
The present invention is based on the method for correcting error of the drilling deviation correcting device of casing follow-up, by adjusting drill bit and are located on the outside of drill bit
Casing between relative position, change stratum to casing end steering selection face 3 active force, thus change steering selection
Face 3 and 4 active force relative size of maintenance face is turned to, and then adjusting sleeve tube top is into angle.
The deviation correcting device recorded in embodiment 3 is applied in the drilling method for correcting error to follow up the present invention is based on casing, is such as schemed
It is specific as follows shown in 5.
When actual borehole direction Y is relative to design boring direction X, meeting is deviated to the direction B, and the steering of casing 2 be made to select face 3
Towards the direction B, maintenance face 4 is turned to towards the C direction contrary with B；
Such as：When setting horizontal drilling, it is known that drill bit is easy up and down in boring procedure, then by the short mouth end of casing and long mouth
End is placed in the underface and surface of drilling.
Following several situations are specifically included in drilling process：
Situation 1., when drill bit 1 be fully located at casing 2 turn to 3 rear end of selection face, and 1 front end of drill bit and turn to 3 rear end of selection face it
Between distance when being greater than 1-1.5 times of 2 outer diameter of casing, turn to selection face 3 and turn to maintenance face 4 with stratum full contact, and
It turns to the stratum at selection face 3 not disturbed by drill bit 1, stratum is maximum to the active force for turning to selection face 3 in drilling process, turns to
Selection face 3, much larger than maintenance face 4 is turned to, adjusts direction Y and is intended to the deflection of the direction C to the adjustment effect of direction Y.
2., when drill bit 1 situation turns to 3 rear end of selection face and apart from the set of 1-1.5 times of 3 rear end of the selection face of steering from being located at
When the position of 2 outer diameter of pipe moves forward, gradually approaches the rear end for turning to selection face 3, drill bit is to steering selection face 3 in drilling process
Place's ground disturbance incrementally increases, and stratum is gradually reduced the active force for turning to selection face 3, and it is complete with stratum always to turn to maintenance face 4
Full connected turns to maintenance face 4 and is gradually increased to the deflection adjustment effect of direction Y.
3., when drill bit 1 is gradually moved forward to from steering 3 rear end of selection face situation flushes or exceeds with the selection face of steering 3
When turning to 3 front end of selection face, drill bit 1 directly takes the soil body turned near selection face 3 out of when drilling, and stratum is to the selection face of steering
3 active force is zero, turns to selection face 3 and does not generate effect to the change of drilling direction, it is complete with stratum always to turn to maintenance face 4
Contact, only steering maintenance face 4 adjust direction Y and are intended to the deflection of the direction B.
The flexible adjustment of drill bit is carried out according to the adjusting trend of above-mentioned active force for the actual deflection situation of drilling, it is real
The correction of existing drilling direction, completes drilling.
Embodiment described above only describe the preferred embodiments of the invention, not to model of the invention
It encloses and is defined, without departing from the spirit of the design of the present invention, those of ordinary skill in the art are to technical side of the invention
The various changes and improvements that case is made should all be fallen into the protection scope that claims of the present invention determines.
Claims (12)
1. the present invention is based on the drilling method for correcting error of casing follow-up, it is characterised in that：By adjusting drill bit（1）It is adapted with outside
Casing（2）Between front and back relative position, change drilling process in stratum to casing（2）End turns to selection face（3）Work
Firmly size, to adjust casing（2）Jacking direction.
2. the drilling method for correcting error according to claim 1 based on casing follow-up, it is characterised in that：Specifically include following feelings
Condition：
The actual borehole direction Y of drilling is the direction A relative to design boring direction X, offset direction, makes casing（2）Steering choosing
Select face（3）Towards the direction the A side of drilling；
Situation one works as drill bit（1）It is fully located at casing（2）The selection face of steering（3）Rear end, and drill bit（1）Front end and steering select
Face（3）The distance between rear end is greater than 1-1.5 times of casing（2）When outer diameter, selection face is turned in drilling process（3）Earth layer in front
To the selection face of steering（3）Active force it is maximum, opposite direction from drilling direction to A direction maximum to the adjustment effect of dilling angle
Deflection speed is most fast；
Situation two works as drill bit（1）Selection face is turned to from being located at（3）Rear end and apart from turn to selection face（3）1-1.5 times of rear end
Casing（2）The position of outer diameter moves forward, gradually close to the selection face of steering（3）Rear end when, drill bit（1）To the selection face of steering
（3）Neighbouring stratum generates loosening, and stratum is to the selection face of steering in drilling process（3）Active force gradually reduce, to drilling angle
The adjustment effect of degree is gradually reduced, and is crept into the deflection speed of the opposite direction in the direction A and is reduced；
Situation three works as drill bit（1）From the selection face of steering（3）Rear end gradually moves forward to and the selection face of steering（3）It flushes or surpasses
Selection face is turned to out（3）When front end, stratum is to the selection face of steering in drilling process（3）Active force be zero, turn to selection face（3）
Effect is not generated to the change of drilling direction.
3. the drilling method for correcting error according to claim 1 based on casing follow-up, it is characterised in that：Casing（2）End is also
It is provided with the maintenance face of steering（4）, specifically include following situations：
When actual borehole direction Y is relative to design boring direction X, offset direction is the direction B, makes casing（2）Steering select face
（3）Towards the direction B of drilling, maintenance face is turned to（4）Towards the C direction contrary with B；
Situation 1., work as drill bit（1）It is fully located at casing（2）The selection face of steering（3）Rear end, and drill bit（1）Front end and steering select
Face（3）The distance between rear end is greater than 1-1.5 times of casing（2）When outer diameter, selection face is turned to（3）With the maintenance face of steering（4）?
It is completely attached to stratum, turns to selection face（3）The stratum at place is not by drill bit（1）It disturbs, stratum selects steering in drilling process
Face（3）Active force it is maximum, and turn to selection face（3）The maintenance face of steering is much larger than to the adjustment effect of direction Y（4）, adjusting side
It is intended to the direction C to Y to deflect；
Situation 2., work as drill bit（1）Selection face is turned to from being located at（3）Rear end and apart from turn to selection face（3）1-1.5 times of rear end
Casing（2）The position of outer diameter moves forward, gradually close to the selection face of steering（3）Rear end when, drill bit is to steering in drilling process
Selection face（3）Place's ground disturbance incrementally increases, and stratum is to the selection face of steering（3）Active force be gradually reduced, turn to maintenance face（4）
Always it is completely attached to stratum, turns to maintenance face（4）The deflection adjustment effect of direction Y is gradually increased；
Situation 3., work as drill bit（1）From the selection face of steering（3）Rear end gradually moves forward to and the selection face of steering（3）It flushes or surpasses
Selection face is turned to out（3）When front end, drill bit when drilling（1）By the selection face of steering（3）The neighbouring soil body is directly taken out of, stratum to turn
To selection face（3）Active force be zero, turn to selection face（3）Effect is not generated to the change of drilling direction, turns to maintenance face（4）
Always it is completely attached to stratum, only steering maintenance face（4）It adjusts direction Y and is intended to the deflection of the direction B.
4. deviation correcting device used in the drilling method for correcting error based on casing follow-up described in claim 1-3 any one,
It is characterized in that：Including drill bit（1）Be located at drill bit（1）The casing in outside（2）；Drill bit（1）Facing sleeve（2）Elastic fortune
It is dynamic；Casing（2）Front end nozzle at be provided with turn to selection face（3）, turn to selection face（3）Positioned at casing（2）The side of nozzle,
And towards casing（2）Central axis direction.
5. deviation correcting device according to claim 4, it is characterised in that：Described sleeve pipe（2）Front end nozzle side side wall
On be provided with correction plate（31）, plate of rectifying a deviation（31）The medial surface fitting of one end is arranged in casing（2）On side wall, other end horizontal direction
Casing is stretched out in outer extension（2）The correction plate of nozzle（31）Medial surface formed turn to selection face（3）.
6. deviation correcting device according to claim 4, it is characterised in that：Described sleeve pipe（2）Front end nozzle be oblique nozzle,
The steering selection face（3）Below the tip that oblique nozzle forward extends out.
7. deviation correcting device according to claim 6, it is characterised in that：The tip of the oblique nozzle is provided with cambered plate
（32）, cambered plate（32）One end fitting is arranged in casing（2）On tube wall, the other end extends horizontally outward, stretches out oblique nozzle
Cambered plate（32）Medial surface and oblique nozzle tip medial surface be collectively formed turn to selection face（3）.
8. deviation correcting device according to claim 6, it is characterised in that：The steering selection face（3）Along jacking direction, towards remote
From casing（2）Central axial direction be obliquely installed.
9. deviation correcting device according to claim 8, it is characterised in that：It is additionally provided with and turns above the tip of the oblique nozzle
To the face of maintenance（4）, the steering maintenance face（4）Positioned at the selection face of steering（3）Top, along jacking direction, towards casing（2）In
Heart axis direction is obliquely installed.
10. deviation correcting device according to claim 9, it is characterised in that：The casing of the oblique nozzle tip（2）Edge court
To casing（2）Central axial direction, obliquely outward formation maintain inclined plate（41）, maintain inclined plate（41）Outside inclined-plane be
The maintenance face of steering（4）, maintain inclined plate（41）Inclined downward be provided with selection baffle（42）, select baffle（42）Outside inclined-plane
To turn to selection face（3）；Select baffle（42）One end edge and steering maintenance face（4）End face connection, the other end is diagonally downward
Extend and passes through connecting plate（43）With casing（2）Inner sidewall connection.
11. deviation correcting device according to claim 9, it is characterised in that：The steering selection face（3）Area be greater than turn to
Maintenance face（4）Area.
12. deviation correcting device according to claim 10, it is characterised in that：The selection baffle（42）With casing（2）Center
Angle between axis, which is greater than, maintains inclined plate（41）With casing（2）Angle between central axis.
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| CN201810833302.5A CN108868611B (en) | 2018-07-26 | 2018-07-26 | Borehole deviation rectifying method and device based on casing follow-up |
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| CN108868611B (en) | 2020-04-03 |
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