CN108868611B - Borehole deviation rectifying method and device based on casing follow-up - Google Patents
Borehole deviation rectifying method and device based on casing follow-up Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 52
- 238000005553 drilling Methods 0.000 claims abstract description 104
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- 239000002689 soil Substances 0.000 claims description 23
- 230000000694 effects Effects 0.000 claims description 16
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
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- E21B7/10—Correction of deflected boreholes
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Abstract
The invention relates to the technical field of underground drilling construction, and discloses a drilling deviation rectifying method and a deviation rectifying device based on casing follow-up. The invention changes the acting force of stratum to the sleeve end turning selection surface in the drilling process by adjusting the front and back relative positions between the drill bit and the sleeve matched with the outer side so as to adjust the jacking direction of the sleeve. The invention has simple structure, high deviation rectifying precision and convenient operation.
Description
Technical Field
The invention relates to the technical field of underground drilling construction, in particular to a drilling deviation rectifying method and a deviation rectifying device based on casing follow-up.
Background
Drilling is one of the processes commonly involved in the construction of surrounding rock reinforcement, water stop and the like in the construction of underground space. In the drilling process, the drilling precision is difficult to ensure due to geological conditions, drilling process and the like. When a deep hole with the depth of more than 20 meters is drilled, the direction of the drill rod is easy to change under the action of self gravity and the non-uniformity and the variability of surrounding rocks, so that the drilling direction deviates from the design direction, the hole forming quality is influenced, and meanwhile, the frictional resistance between the drill rod and the inner wall of a drilled hole is increased, so that the drilling difficulty is caused, and the drill rod or a drill bit is damaged.
In the drilling process, when the actual drilling track deviates from the designed drilling track, a drilling deviation rectifying technology is often adopted for rectifying deviation. In the current construction, the most frequently used casing follow-up deviation rectifying technology is to adopt a deviation rectifying plate with a wedge shape, the front end of a drill rod is generally arranged to be rectified by stopping rotation, adjusting the direction of the wedge-shaped deviation rectifying plate and directly jacking forwards to realize deviation rectification, and the deviation rectifying device has a good deviation rectifying effect under certain conditions. The method has the defects that the drilling tool cannot rotate to produce soil during deviation correction, so that the soil is not smooth, the torque of the drilling machine is increased, the drill bit is deformed, and the equipment loss is increased.
In the non-casing follow-up construction, the wedge-shaped deviation rectifying plate is directly arranged at the front end of the jacking drill rod, and when the deviation is rectified, the orientation of the wedge-shaped deviation rectifying plate is adjusted by rotating the drill rod to rectify the deviation.
The direction of the wedge-shaped deviation correcting plate needs to be determined before deviation correction, a sensor capable of measuring the tool angle needs to be installed for determining the direction of the wedge-shaped deviation correcting plate, and the tool angle is transmitted out of the hole in a wired or wireless mode.
Disclosure of Invention
The invention provides a casing-based drilling hole deviation rectifying device and a deviation rectifying method thereof, which have the advantages of simple structure, high deviation rectifying precision, convenience in operation and no increase of drilling tool loss.
The technical problem to be solved is that: the existing wedge-shaped deviation correcting plate is arranged at the front end of the drill bit, so that the existing wedge-shaped deviation correcting plate can cause unsmooth soil emergence and increase the torque of a drilling machine, thereby causing the deformation of the drill bit and increasing the equipment loss; and the wedge-shaped deviation correction plate direction must be determined by means of an angle sensor.
In order to solve the technical problems, the invention adopts the following technical scheme:
the casing-based borehole deviation rectifying method changes the acting force of the stratum on the casing end steering selection surface in the drilling process by adjusting the front and back relative positions between the drill bit and the casing which is matched with the outer side, so as to adjust the jacking direction of the casing.
The invention relates to a casing-based borehole deviation rectifying method, which further comprises the following conditions:
the actual drilling direction Y of the drill hole is opposite to the designed drilling direction X, the deviation direction is the direction A, and the steering selection surface of the sleeve is made to face to one side of the direction A of the drill hole;
in the first situation, when the drill bit is completely positioned at the rear end of the casing steering selection surface, and the distance between the front end of the drill bit and the rear end of the steering selection surface is more than 1-1.5 times of the outer diameter of the casing, the acting force of the stratum in front of the steering selection surface on the steering selection surface is the largest in the drilling process, the adjusting effect on the drilling angle is the largest, and the reverse deflection speed in the drilling direction A is the fastest;
when the drill bit moves forwards from the position, which is located at the rear end of the steering selection surface and is 1-1.5 times of the outer diameter of the sleeve pipe away from the rear end of the steering selection surface, and gradually approaches the rear end of the steering selection surface, the drill bit loosens the stratum near the steering selection surface, the acting force of the stratum on the steering selection surface is gradually reduced in the drilling process, the adjusting effect on the drilling angle is gradually reduced, and the deflection speed in the direction opposite to the drilling direction A is reduced;
and thirdly, when the drill bit moves forward from the rear end of the steering selection surface to be flush with the steering selection surface or exceed the front end of the steering selection surface, the acting force of the stratum on the steering selection surface is zero in the drilling process, and the steering selection surface does not have an effect on the change of the drilling direction.
The invention relates to a casing-based borehole deviation rectifying method, and further, a casing end is also provided with a steering maintaining surface, which specifically comprises the following conditions:
when the actual drilling direction Y is opposite to the designed drilling direction X, the deviation direction is the direction B, the steering selection surface of the sleeve is made to face the direction B of the drilling hole, and the steering maintaining surface is made to face the direction C opposite to the direction B;
①, when the drill bit is completely located at the rear end of the casing steering selection surface and the distance between the front end of the drill bit and the rear end of the steering selection surface is larger than 1-1.5 times of the casing outer diameter, the steering selection surface and the steering maintaining surface are completely contacted with the stratum, the stratum at the steering selection surface is not disturbed by the drill bit, the acting force of the stratum on the steering selection surface is the largest in the drilling process, the adjusting effect of the steering selection surface on the direction Y is far greater than that of the steering maintaining surface, and the adjusting direction Y tends to deflect in the direction C;
②, when the drill bit moves forward from the position of the casing outer diameter which is at the rear end of the steering selection surface and is 1-1.5 times of the rear end of the steering selection surface and approaches the rear end of the steering selection surface, the disturbance of the drill bit to the stratum at the steering selection surface is increased gradually in the drilling process, the acting force of the stratum to the steering selection surface is reduced gradually, the steering maintenance surface is always in full contact with the stratum, and the deflection regulation effect of the steering maintenance surface in the direction Y is increased gradually;
when the drill bit moves forward from the rear end of the steering selection surface to be flush with the steering selection surface or exceed the front end of the steering selection surface, ③, the drill bit directly brings out soil near the steering selection surface during drilling, the acting force of the stratum on the steering selection surface is zero, the steering selection surface does not act on the change of the drilling direction, the steering maintenance surface is always in full contact with the stratum, and only the adjusting direction Y of the steering maintenance surface tends to deflect in the direction B.
The deviation correcting device comprises a drill bit and a sleeve positioned on the outer side of the drill bit; the drill bit moves back and forth relative to the sleeve in a telescopic way; the front end pipe orifice of the sleeve is provided with a steering selection surface, and the steering selection surface is positioned on one side of the pipe orifice of the sleeve and faces to the central shaft direction of the sleeve.
The deviation correcting device is characterized in that a deviation correcting plate is arranged on the side wall of one side of the pipe orifice at the front end of the sleeve, the inner side surface of one end of the deviation correcting plate is attached to the side wall of the sleeve, the other end of the deviation correcting plate extends outwards horizontally, and the inner side surface of the deviation correcting plate extending out of the pipe orifice of the sleeve forms a steering selection surface.
The deviation correcting device is characterized in that the pipe orifice at the front end of the sleeve is an inclined pipe orifice, and the steering selection surface is positioned below the tip part of the inclined pipe orifice extending forwards.
The deviation correcting device is characterized in that the tip of the oblique pipe orifice is provided with an arc panel, one end of the arc panel is attached to the wall of the sleeve, the other end of the arc panel extends outwards horizontally, and the inner side surface of the arc panel extending out of the oblique pipe orifice and the inner side surface of the tip of the oblique pipe orifice form a steering selection surface together.
The deviation correcting device is characterized in that the steering selection surface is arranged in an inclined mode along the jacking direction and towards the direction far away from the central axis of the sleeve.
The deviation correcting device is characterized in that a steering maintaining surface is further arranged above the tip of the oblique pipe orifice, is positioned above the steering selection surface and is obliquely arranged along the jacking direction and towards the central axis direction of the sleeve.
The deviation correcting device is characterized in that the edge of the sleeve at the tip of the oblique pipe orifice extends outwards in an oblique manner towards the direction of the central axis of the sleeve to form a maintaining inclined plate, the outer inclined surface of the maintaining inclined plate is a steering maintaining surface, a selecting baffle plate is obliquely arranged below the maintaining inclined plate, and the outer inclined surface of the selecting baffle plate is a steering selecting surface; one end edge of the selective baffle is connected with the end face of the steering maintaining face, and the other end of the selective baffle extends downwards in an inclined mode and is connected with the inner side wall of the sleeve through a connecting plate.
Further, the area of the steering selection surface is larger than that of the steering maintaining surface.
In the deviation correcting device, an included angle between the selection baffle and the central axis of the sleeve is larger than an included angle between the maintaining inclined plate and the central axis of the sleeve.
Compared with the prior art, the drilling hole deviation correcting device based on the sleeve has the following beneficial effects:
the drilling deviation correcting device is simple in structure, the angle control structure is arranged at the front end of the sleeve, and the acting force of the angle control structure is adjusted by adjusting the front-back relative position relation of the drill bit and the sleeve, so that the deviation correction of the drilling direction is realized, the drilling does not need to be stopped, the unearthing is not influenced, the jacking resistance of the drill bit part does not need to be suddenly increased, the deformation of the drill bit or the sleeve is not caused, and the tool angle of the drill bit does not need to be measured.
The drilling deviation correcting device monitors the actual drilling direction in real time, adjusts the extension of the drill bit after the deviation of the drilling direction is found, changes the acting force of the soil body or the stratum to be cut on the steering selection surface in the angle control structure, further changes the control degree of the steering selection surface and the steering maintaining surface on the deflection direction, and has the advantages of convenient and efficient operation and high deviation correcting precision.
When the inclined pipe orifice is the inclined wedge surface, the arc panel is arranged above the long orifice end, so that the actual action area of the steering selection surface can be increased, the strength of the long orifice end of the sleeve can be increased, and the sleeve is prevented from being damaged or deformed in the jacking process.
The drilling hole deviation rectifying method is simple and easy to operate, flexible, wide in application range and strong in controllability, avoids the traditional method for rectifying deviation through pipe rotation, greatly simplifies the deviation rectifying process, ensures normal slag discharge in the deviation rectifying process, and avoids the loss of a drilling tool caused by deviation rectification.
The casing-based borehole deviation correcting device and the deviation correcting method thereof of the present invention will be further described with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic structural diagram of a borehole deviation correcting device according to embodiment 1;
FIG. 2 is a schematic view of a structure of a socket according to embodiment 2;
FIG. 3 is a schematic view of a borehole deviation rectifying process in embodiment 2;
FIG. 4 is a schematic structural diagram of a deviation correcting device for drilling according to embodiment 3;
fig. 5 is a schematic diagram of a drilling deviation rectifying process in embodiment 3.
Reference numerals:
1-a drill bit; 2-a sleeve; 3-a steering selection surface; 31-a deviation rectifying plate; 32-arc panel; 4-a steering-maintaining surface; 41-maintaining inclined plates; 42-select baffles; 43-connecting plate.
Detailed Description
Example 1
According to the analysis of soil layers and soil texture of a certain place to be drilled, the soil texture is a sand layer; according to the existing engineering construction experience, the influence of sandy strata is clear, and the drilling direction is easy to deflect towards one direction, so that the drilling deviation correcting device is adopted, a spiral unearthed drill rod is selected, and drilling is carried out according to the deviation correcting method.
As shown in figure 1, the drilling deviation correcting device based on casing follow-up comprises a drill bit 1 and a casing 2 positioned outside the drill bit 1, wherein the pipe diameter of the casing 2 is adapted to the size of the drill bit 1, and the drill bit 1 moves back and forth relative to the casing 2 in a telescopic manner; the front end orifice of the sleeve 2 is provided with a steering selection surface 3, the steering selection surface 3 is positioned on one side of the orifice of the sleeve 2 and faces the direction of the central axis of the sleeve 2, and the pipe diameter of the sleeve 2 is adapted to the size of the drill bit 1.
In the embodiment, a drill bit 1 is fixedly connected with a telescopic oil cylinder through a drill rod, the tail end of a sleeve 2 is fixedly connected with a pushing mechanism, and the telescopic oil cylinder is arranged behind the pushing mechanism; the drill bit 1 and the sleeve 2 are pushed forward together under the pushing of the pushing mechanism, the drill bit 1 moves relative to the sleeve 2 in a telescopic mode under the action of the telescopic oil cylinder, and the relative position of the drill bit 1 and the sleeve 2 is adjusted.
The front end mouth of pipe of sleeve 2 is conventional flat mouthful mouth of pipe, is provided with the board 31 of rectifying on the lateral wall of its one side, and the internal surface of the board 31 of rectifying is the cambered surface setting, and the medial surface laminating of the board 31 one end of rectifying sets up on the 2 lateral walls of sleeve, sets up all can on inside wall or lateral wall, and the other end level extends outwards, and the medial surface that stretches out the orificial board 31 of rectifying of sleeve 2 forms and turns to selection face 3.
The central angle of the deviation-correcting plate 31 is not more than 60 degrees.
Example 2
The stratum is the sandy cobble stratum, according to existing engineering construction experience, has definitely influenced by the sandy cobble stratum, and the horizontal drilling direction is upwards deflected more easily, chooses the down-the-hole hammer tup for use, and the last difference of deviation correcting device lies in:
as shown in fig. 2, the tip of the oblique nozzle at the front end of the casing 2 is provided with an arc panel 32, one end of the arc panel 32 is attached to the wall of the casing 2, the other end extends horizontally outwards, and the inner side surface of the arc panel 32 extending out of the oblique nozzle and the inner side surface of the tip of the oblique nozzle form a turning selection surface 3 together.
The arcuate panels 32 correspond to a central angle of no more than 60.
The deviation correcting devices described in embodiments 1 and 2 are applied to the casing following-based borehole deviation correcting method of the present invention, and the disturbance effect of the drill bit on the formation or the cutting soil is changed by adjusting the relative position between the drill bit and the casing arranged outside the drill bit, so as to change the acting force of the formation or the cutting soil on the steering selection surface of the casing end, and adjust the jacking angle of the deviation correcting device.
Firstly, determining that the actual drilling direction Y of a drill hole can deviate towards the direction A relative to the designed drilling direction X according to stratum soil texture analysis and empirical judgment, and adjusting the direction of a deviation correcting device to enable a steering selection surface 3 of a sleeve to face towards the direction A of the drill hole, as shown in figure 3;
for example: when a horizontal drill hole is drilled, if the drill hole is known to be easy to incline upwards, the short-end of the sleeve is arranged right above the drill hole, and the long-end is arranged right below the drill hole;
the drilling process specifically comprises the following conditions:
in the first situation, when the drill bit 1 is completely positioned at the rear end of the steering selection surface 3 of the casing 2, and the distance between the front end of the drill bit 1 and the rear end of the steering selection surface 3 is more than 1-1.5 times of the outer diameter of the casing 2, the position of the drill bit 1 has no disturbance effect on soil at the steering selection surface 3, and the steering selection surface 3 is completely contacted with the stratum all the time, so that the action force of the stratum at the steering selection surface 3 on the steering selection surface 3 is the largest in the drilling process, the adjustment effect on the drilling angle is the largest, and the reverse deflection speed of the drilling direction to the direction A is the fastest.
The distance that the distance between the front end of the drill bit 1 and the rear end of the steering selection surface 3 is larger than the outer diameter of the casing 2 by 1-1.5 times is a distance which fully considers the disturbance effect of the drill bit 1 on the soil mass of the stratum in front of the drill bit in the drilling process and can loosen the soil mass nearby, and even if the drill bit 1 is not jacked into the soil mass disturbance area in front, the resistance of the loosened soil mass on jacking equipment is reduced.
And secondly, when the drill bit 1 moves forwards from the position, which is located at the rear end of the steering selection surface 3 and is 1-1.5 times of the outer diameter of the sleeve 2 away from the rear end of the steering selection surface 3, to gradually approach the rear end of the steering selection surface 3, the drill bit 1 gradually loosens the stratum near the steering selection surface 3 to a certain degree, the acting force of the stratum at the steering selection surface 3 on the steering selection surface 3 is gradually reduced in the drilling process, the adjusting effect on the drilling angle is gradually reduced, and the deflection speed of the drilling in the direction opposite to the direction A is reduced.
And thirdly, when the drill bit moves forward from the rear end of the steering selection surface to be flush with the pipe orifice or exceed the front end of the steering selection surface, the soil body near the steering selection surface 3 is directly taken out by the drill bit 1 during drilling, the contact area of the steering selection surface 3 and the cutting soil body is zero, the acting force of the stratum on the steering selection surface is zero during drilling, and the steering selection surface does not have an effect on the change of the drilling direction.
And aiming at the actual deflection condition of drilling, the drill bit 1 is adjusted in a telescopic mode according to the adjustment trend of the acting force, so that the deviation correction of the drilling direction is realized, and the drilling is completed.
Example 3
When the stratum and the soil structure to be drilled are complex, such as a sand layer; the drilling deviation correcting device of the embodiment is adopted, a three-wing drill bit is selected, and drilling is carried out according to the deviation correcting method.
As shown in fig. 4, the casing following-based borehole deviation correcting device of the present invention includes a drill bit 1 and a casing 2 disposed outside the drill bit 1, wherein the pipe diameter of the casing 2 is adapted to the size of the drill bit 1, the drill bit 1 is telescopic forward and backward relative to the casing 2, and the pipe diameter of the casing 2 is adapted to the size of the drill bit 1; a pipe orifice at the front end of the sleeve 2 is provided with a steering selection surface 3 and a steering maintaining surface 4, and the steering selection surface 3 is positioned on one side of the pipe orifice of the sleeve 2 and faces to the direction of the central axis of the sleeve 2; the steering selection surface 3 is obliquely arranged along the jacking direction and in the direction far away from the central axis of the casing 2 and is in direct contact with the soil body on the oblique inner side of the jacking direction; the steering maintaining surface 4 is positioned above the steering selecting surface 3, is obliquely arranged along the jacking direction and towards the central axis direction of the casing 2, and is directly contacted with soil on the oblique outer side of the jacking direction. In the embodiment, a drill bit 1 is fixedly connected with a telescopic oil cylinder through a drill rod, the tail end of a sleeve 2 is fixedly connected with a pushing mechanism, and the telescopic oil cylinder is arranged on the pushing mechanism; the drill bit 1 and the sleeve 2 are pushed forward together under the pushing of the pushing mechanism, the drill bit 1 moves relative to the sleeve 2 in a telescopic mode under the action of the telescopic oil cylinder, and the relative position of the drill bit 1 and the sleeve 2 is adjusted.
The edge of the sleeve at the tip of the oblique pipe orifice inclines towards the central axis direction of the sleeve 2 and extends outwards to form a maintaining inclined plate 41, the outer inclined surface of the maintaining inclined plate 41 is a steering maintaining surface 4, the included angle between the maintaining inclined plate 41 and the central axis of the sleeve 2 is not more than 3 degrees, and the central angle corresponding to the maintaining inclined plate 41 is not less than 15 degrees; a selection baffle 42 is obliquely arranged below the maintaining inclined plate 41, and the outer inclined surface of the selection baffle 42 is a steering selection surface 3; one end edge of the selective baffle 42 is connected with the end surface of the steering maintaining surface 4, the other end extends downwards in an inclined way and is connected with the inner side wall of the sleeve 2 through a connecting plate 43, and the connecting plate 43 is arranged in an inclined way; the included angle between the baffle plate 42 and the central axis of the sleeve 2 is preferably selected to be 8-30 degrees, the included angle between the baffle plate 42 and the central axis of the sleeve 2 is selected to be larger than the included angle between the maintaining inclined plate 41 and the central axis of the sleeve 2, or the area of the turning selecting surface 3 is larger than the area of the turning maintaining surface 4.
According to the deviation rectifying method of the drilling deviation rectifying device based on casing follow-up, the relative position between the drill bit and the casing positioned on the outer side of the drill bit is adjusted, the acting force of the stratum on the steering selection surface 3 of the casing end is changed, the relative size of the acting force of the steering selection surface 3 and the steering maintaining surface 4 is changed, and the jacking angle of the casing is adjusted.
The deviation correcting device described in embodiment 3 is applied to the casing following based borehole deviation correcting method of the present invention, as shown in fig. 5, specifically as follows.
When the actual drilling direction Y is opposite to the designed drilling direction X, the actual drilling direction Y deviates to the direction B, so that the steering selection surface 3 of the sleeve 2 faces to the direction B, and the steering maintaining surface 4 faces to the direction C opposite to the direction B;
for example: when horizontal drilling is performed, the short-mouth end and the long-mouth end of the sleeve are arranged right below and above the drilled hole, knowing that a drill bit is easy to overlook and overlook in the drilling process.
The drilling process specifically comprises the following conditions:
①, when the drill bit 1 is completely located at the rear end of the steering selection surface 3 of the casing 2, and the distance between the front end of the drill bit 1 and the rear end of the steering selection surface 3 is more than 1-1.5 times of the outer diameter of the casing 2, the steering selection surface 3 and the steering maintenance surface 4 are completely contacted with the formation, the formation at the steering selection surface 3 is not disturbed by the drill bit 1, the acting force of the formation on the steering selection surface 3 is the largest in the drilling process, the adjusting effect of the steering selection surface 3 on the direction Y is far greater than that of the steering maintenance surface 4, and the adjusting direction Y tends to deflect in the direction C.
②, when the drill bit 1 moves forward from the position of the casing 2 with the outer diameter 1-1.5 times of the rear end of the steering selection surface 3 and away from the rear end of the steering selection surface 3 and approaches the rear end of the steering selection surface 3, the disturbance of the drill bit to the formation at the steering selection surface 3 is increased gradually during the drilling process, the acting force of the formation to the steering selection surface 3 is reduced gradually, the steering maintenance surface 4 is always in full contact with the formation, and the deflection regulating action of the steering maintenance surface 4 to the direction Y is increased gradually.
③, when the drill bit 1 moves forward from the rear end of the steering selection surface 3 to be flush with the steering selection surface 3 or exceed the front end of the steering selection surface 3, the drill bit 1 directly brings out soil near the steering selection surface 3 during drilling, the acting force of the stratum on the steering selection surface 3 is zero, the steering selection surface 3 does not act on the change of the drilling direction, the steering maintenance surface 4 is always in full contact with the stratum, and only the steering maintenance surface 4 adjusts the direction Y and tends to deflect in the direction B.
And aiming at the actual deflection condition of drilling, the drill bit is adjusted in a telescopic way according to the adjustment trend of the acting force, so that the deviation correction of the drilling direction is realized, and the drilling is completed.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (12)
1. The borehole deviation rectifying method based on casing follow-up is characterized in that: the jacking direction of the casing (2) is adjusted by adjusting the front and back relative positions between the drill bit (1) and the casing (2) which is matched with the outer side and changing the acting force of the stratum on the end turning selection surface (3) of the casing (2) in the drilling process.
2. The casing following-based borehole deviation rectifying method according to claim 1, wherein: the method specifically comprises the following conditions:
the actual drilling direction Y of the drill hole is opposite to the designed drilling direction X, the deviation direction is the direction A, and the steering selection surface (3) of the sleeve (2) faces to one side of the direction A of the drill hole;
in the first situation, when the drill bit (1) is completely positioned at the rear end of the steering selection surface (3) of the casing (2), and the distance between the front end of the drill bit (1) and the rear end of the steering selection surface (3) is more than 1-1.5 times of the outer diameter of the casing (2), the acting force of a stratum in front of the steering selection surface (3) on the steering selection surface (3) is the largest in the drilling process, the adjustment effect on the drilling angle is the largest, and the reverse deflection speed in the drilling direction A is the fastest;
when the drill bit (1) moves forwards from the position, located at the rear end of the steering selection surface (3), of the outer diameter of the sleeve (2) which is 1-1.5 times of the outer diameter of the rear end of the steering selection surface (3) and is away from the rear end of the steering selection surface (3) and approaches the rear end of the steering selection surface (3) gradually, the drill bit (1) loosens the stratum near the steering selection surface (3), the acting force of the stratum on the steering selection surface (3) is gradually reduced in the drilling process, the adjusting effect on the drilling angle is gradually reduced, and the deflection speed of the drilling direction opposite to the direction A is reduced;
and thirdly, when the drill bit (1) moves forward from the rear end of the steering selection surface (3) to be flush with the steering selection surface (3) or exceed the front end of the steering selection surface (3), the acting force of the stratum on the steering selection surface (3) is zero in the drilling process, and the steering selection surface (3) does not act on the change of the drilling direction.
3. The casing following-based borehole deviation rectifying method according to claim 1, wherein: the end head of the sleeve (2) is also provided with a steering maintaining surface (4), and the steering maintaining surface comprises the following conditions:
when the actual drilling direction Y is opposite to the design drilling direction X, the deviation direction is B direction, the steering selection surface (3) of the sleeve (2) faces to the B direction of the drilling hole, and the steering maintaining surface (4) faces to the C direction opposite to the B direction;
①, when the drill bit (1) is completely positioned at the rear end of the steering selection surface (3) of the casing (2), and the distance between the front end of the drill bit (1) and the rear end of the steering selection surface (3) is more than 1-1.5 times of the outer diameter of the casing (2), the steering selection surface (3) and the steering maintenance surface (4) are completely contacted with the stratum, the stratum at the steering selection surface (3) is not disturbed by the drill bit (1), the acting force of the stratum on the steering selection surface (3) is the largest in the drilling process, the adjusting effect of the steering selection surface (3) on the direction Y is far greater than that of the steering maintenance surface (4), and the adjusting direction Y tends to deflect in the direction C;
②, when the drill bit (1) moves forward from the position of the outer diameter of the casing (2) which is located at the rear end of the steering selection surface (3) and is 1-1.5 times of the outer diameter of the casing from the rear end of the steering selection surface (3) and approaches the rear end of the steering selection surface (3) gradually, the disturbance of the drill bit to the stratum at the steering selection surface (3) is increased gradually in the drilling process, the acting force of the stratum to the steering selection surface (3) is reduced gradually, the steering maintaining surface (4) is always in complete contact with the stratum, and the deflection adjusting function of the steering maintaining surface (4) to the direction Y is increased gradually;
③, when the drill bit (1) moves forward from the rear end of the steering selection surface (3) to be flush with the steering selection surface (3) or exceed the front end of the steering selection surface (3), the drill bit (1) directly brings out soil near the steering selection surface (3) during drilling, the acting force of the stratum on the steering selection surface (3) is zero, the steering selection surface (3) does not act on the change of the drilling direction, the steering maintenance surface (4) is always in complete contact with the stratum, and only the steering maintenance surface (4) adjusts the direction Y and tends to the direction B to deflect.
4. The deviation rectifying device used in the casing following based borehole deviation rectifying method according to any one of claims 1 to 3, wherein: comprises a drill bit (1) and a sleeve (2) positioned outside the drill bit (1); the drill bit (1) can do front and back telescopic motion relative to the sleeve (2); the front end pipe orifice of the sleeve (2) is provided with a steering selection surface (3), and the steering selection surface (3) is positioned on one side of the pipe orifice of the sleeve (2) and faces the central shaft direction of the sleeve (2).
5. The deviation correcting device according to claim 4, wherein: the lateral wall of one side of the front end pipe orifice of the sleeve (2) is provided with a deviation rectifying plate (31), the inner side face of one end of the deviation rectifying plate (31) is attached to the lateral wall of the sleeve (2), the other end of the deviation rectifying plate horizontally extends outwards, and a steering selection face (3) is formed by the inner side face of the deviation rectifying plate (31) extending out of the pipe orifice of the sleeve (2).
6. The deviation correcting device according to claim 4, wherein: the front end pipe orifice of the sleeve (2) is an oblique pipe orifice, and the steering selection surface (3) is positioned below a tip part which extends forwards from the oblique pipe orifice.
7. The deviation rectifying device according to claim 6, wherein: the utility model discloses a steering selection face, including orificial sharp portion of slope, the laminating of cambered plate (32) one end sets up on sleeve pipe (2) pipe wall, and the other end level is outwards extended, stretches out the medial surface of orificial cambered plate of slope (32) and the medial surface of orificial sharp portion of slope form jointly and turn to selection face (3).
8. The deviation rectifying device according to claim 6, wherein: the steering selection surface (3) is arranged along the jacking direction in an inclined way towards the direction far away from the central axis of the sleeve (2).
9. The deviation rectifying device according to claim 8, wherein: and a steering maintaining surface (4) is also arranged above the tip part of the oblique pipe orifice, and the steering maintaining surface (4) is positioned above the steering selection surface (3) and is obliquely arranged along the jacking direction and towards the direction of the central axis of the sleeve (2).
10. The deviation rectifying device according to claim 9, wherein: the edge of the sleeve (2) at the tip of the oblique pipe orifice extends outwards in an oblique manner towards the direction of the central axis of the sleeve (2) to form a maintaining inclined plate (41), the outer inclined surface of the maintaining inclined plate (41) is a steering maintaining surface (4), a selecting baffle (42) is obliquely arranged below the maintaining inclined plate (41), and the outer inclined surface of the selecting baffle (42) is a steering selecting surface (3); one end edge of the selective baffle plate (42) is connected with the end surface of the steering maintaining surface (4), and the other end extends downwards in an inclined way and is connected with the inner side wall of the sleeve (2) through a connecting plate (43).
11. The deviation rectifying device according to claim 9, wherein: the area of the turning selection surface (3) is larger than that of the turning maintaining surface (4).
12. The deviation rectifying device according to claim 10, wherein: the included angle between the selection baffle plate (42) and the central axis of the sleeve (2) is larger than the included angle between the maintaining inclined plate (41) and the central axis of the sleeve (2).
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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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| 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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| CN109869156B (en) * | 2019-04-02 | 2024-04-26 | 北京首尔工程技术有限公司 | Jacking pipe row for controlling soil discharge amount for pipe row pipe curtain construction and jacking method thereof |
| CN113187394A (en) * | 2021-05-21 | 2021-07-30 | 四川宝鑫建设有限公司 | Front sand rear rock geological inclined angle steel sleeve drilling system and installation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106639870A (en) * | 2016-12-21 | 2017-05-10 | 中交第三航务工程局有限公司宁波分公司 | Drilling hole-forming process of rock-socketed pile |
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| CN1807827B (en) * | 2006-02-09 | 2012-05-23 | 北京发研工程技术有限公司 | High-precision horizontal drilling construction method and device on reinforced concrete |
| CN203334959U (en) * | 2013-07-16 | 2013-12-11 | 中冶建工集团有限公司 | Hole forming device for supporting slope of composite soil-nailed wall |
| CN103343537A (en) * | 2013-07-29 | 2013-10-09 | 李宪奎 | Drilling machine of high-pressure rotary-spraying anchor rod and construction method of high-pressure rotary-spraying anchor rod |
| CN204386490U (en) * | 2014-12-18 | 2015-06-10 | 青海省电力设计院 | A kind of probing follow-up casing bit |
| CN206144566U (en) * | 2016-11-16 | 2017-05-03 | 中铁四局集团有限公司 | Automatic jacking device with jacking guide for large-diameter steel pipe |
| CN106869798B (en) * | 2017-03-30 | 2018-08-17 | 河南理工大学 | The drilling guard aperture method of weak seam mash gas pumping drilling guard aperture drilling tool |
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