CN113153159A - Hydraulic reamer for geological drilling and use method thereof - Google Patents
Hydraulic reamer for geological drilling and use method thereof Download PDFInfo
- Publication number
- CN113153159A CN113153159A CN202110448064.8A CN202110448064A CN113153159A CN 113153159 A CN113153159 A CN 113153159A CN 202110448064 A CN202110448064 A CN 202110448064A CN 113153159 A CN113153159 A CN 113153159A
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- Prior art keywords
- blade
- reaming
- reamer
- hydraulic cylinder
- hydraulic
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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
- E21B7/28—Enlarging drilled holes, e.g. by counterboring
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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
- E21B10/00—Drill bits
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
- E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
- E21B10/322—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools cutter shifted by fluid pressure
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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
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
- E21B10/54—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits
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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
- E21B10/00—Drill bits
- E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
Abstract
The invention discloses a hydraulic reamer for geological drilling and a use method thereof, wherein the reamer comprises a reamer body, a blade mounting groove, a blade sliding groove, a chip removal slideway, an upper nozzle, a lower nozzle, an upper sliding sleeve, a central pipe, a limiting ring, an upper stop block, a recovery spring, a spring seat, a hydraulic cylinder, a lower stop block, a hydraulic cylinder runner, a bypass hole, a lower sliding sleeve seat, a lower positioning joint, a reaming blade and a blade slideway; the invention carries out reaming operation after the shearing pin is sheared by the pressure build-up of the throwing ball, and the full displacement pump can be directly used for reaming when the ball is blocked in the lowering stage; the recovery spring is used as a primary recovery mechanism, if rock debris is clamped in the blade slide way and the elasticity of the spring is not enough to push the reaming blade to recover, the upper sliding sleeve is driven by hydraulic pressure to push the central tube to move downwards by ball throwing pressure building, and the reaming blade is driven to recover; the thrust required by the opening of the reaming blades is completely provided by the upward movement of the hydraulic cylinder driven by the pressure of the drilling fluid, but is opened by utilizing differential pressure instead of throttling and pressure reduction, and the requirements on the pressure and the discharge capacity of the slurry pump are low.
Description
Technical Field
The invention relates to the technical field of geological drilling, in particular to a hydraulic reamer for geological drilling and a using method thereof.
Background
In the geological drilling industry, accidents such as well leakage, stratum breaking and block dropping, borehole shrinkage and drill clamping and the like are frequently encountered in the construction process, and when the accidents are processed, a technical casing is frequently put into the geological drilling industry to seal a problem well section and then a small-size drill bit is used for drilling continuously, so that the production cost is increased. With the technical progress, the sealing technology of the corrugated pipe can be used for processing, the hole expander is used for expanding the diameter of the problem well section, then the corrugated pipe is pressed and expanded after being lowered to the problem well section and is tightly attached to the well wall, complex well sections such as a leakage layer, a collapse layer and a high-pressure layer are effectively sealed, and the size of the well hole is guaranteed to be unchanged. The technology is mainly used in the petroleum drilling industry, the diameter of a used hole expander is larger (more than or equal to 215.9mm), the size of a tool is large, a hole expander blade is pushed out by throttling by using the Bernoulli principle, the discharge capacity requirement is high, and the tool pressure consumption is large; and the size of a well hole in the geological industry is small (less than or equal to 152mm), the diameter of a tool is small, a mechanism is not easy to arrange, the power of a used slurry pump is small, the discharge capacity and the rated pressure are far lower than those of a slurry pump used in the petroleum industry, and the throttling design is difficult to realize.
Therefore, the concentric reamer which is suitable for being used in the geological industry and has low requirements on a mud pump and the using method thereof play an important role in whether a corrugated pipe can be used for sealing a complex stratum or not.
Disclosure of Invention
In view of the above, the present invention provides a hydraulic reamer for geological drilling and a method for using the same, and aims to solve the above technical problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
a hydraulic reamer for geological drilling, comprising:
a reamer body; the reamer body is provided with a stepped limiting installation pore passage; the reamer body is uniformly provided with a plurality of blade mounting grooves along the circumference, and two side walls of the blade mounting grooves are provided with blade sliding grooves; a chip removal slideway is formed at the bottom of the blade mounting groove; the upper part of the reamer body is provided with an upper nozzle, and the lower part of the reamer body is provided with a lower nozzle; an upper sliding sleeve for plugging the upper nozzle is fixed at the upper part of the limiting mounting pore passage through a first shearing pin;
a central tube; the central tube is coaxially sleeved in the limiting mounting pore channel and is provided with a limiting ring which radially protrudes into the blade mounting groove; the limiting ring is connected with an upper stop block through a first set screw; a recovery spring and a spring seat are sleeved on the outer side of the upper part of the central tube, and the recovery spring and the spring seat are tightly propped between the stepped surface of the limiting installation pore passage and the top surface of the limiting ring;
a hydraulic cylinder; the upper part of the hydraulic cylinder is sleeved outside the bottom end of the central tube and is abutted against the bottom edge of the central tube through a stepped surface; the outer side wall of the top end of the hydraulic cylinder is connected with a lower stop block positioned in the blade mounting groove through a second set screw; the upper part of the hydraulic cylinder plugs the lower nozzle and is provided with a hydraulic cylinder flow passage which is staggered with the lower nozzle, and the lower part of the hydraulic cylinder is provided with a bypass hole; a lower sliding sleeve for plugging the bypass hole is fixed on the inner wall of the lower part of the hydraulic cylinder through a second shearing pin; the lower part of the hydraulic cylinder is sleeved on the inner side of the top end of the lower sliding sleeve seat and is abutted against the top edge of the lower sliding sleeve seat through a stepped surface; the bottom end of the lower sliding sleeve seat is abutted against a lower positioning joint, and the lower positioning joint is in threaded connection with the bottom end of the reamer body;
a reaming blade; the reaming cutter blade is arranged in the cutter blade mounting groove; the reaming blade is provided with a blade slideway in sliding connection with the blade sliding groove; the reaming wing is tightly propped between the upper stop block and the lower stop block.
Preferably, in the hydraulic reamer for geological drilling, a diversion trench is longitudinally formed in the middle of the outer side of the reamer blade; the transverse middle part of the reaming blade is provided with gauge protection teeth, and two sides of the reaming blade are provided with PDC cutting teeth.
Preferably, in the hydraulic reamer for geological drilling, the specific setting parameters are as follows: the number of the blade mounting grooves is 3; the number of the upper nozzle, the lower nozzle and the hydraulic cylinder flow passages is 3; the number of the first shearing pins and the number of the second shearing pins are both 3; the number of the first set screws and the number of the second set screws are 3; the number of the bypass holes is 3.
Preferably, in the hydraulic reamer for geological drilling, a first O-ring is sleeved on a connection surface between the upper part of the hydraulic cylinder and the outer side of the bottom end of the central tube; a second O-shaped sealing ring and a third O-shaped sealing ring are sleeved on a connecting surface of the upper part of the hydraulic cylinder and the limiting mounting hole at intervals, and a hydraulic cylinder flow passage is positioned between the second O-shaped sealing ring and the third O-shaped sealing ring; and a fourth O-shaped sealing ring is sleeved on the connecting surface of the lower sliding sleeve seat and the limiting mounting pore passage.
The invention also provides a using method of the hydraulic reamer for geological drilling, which comprises the following steps:
before reaming, the method comprises the following steps: installing the top end of the reamer body at the lower end of the drilling tool assembly, installing a drill bit or a mill shoe on the lower positioning joint, and lowering the lower positioning joint to the uppermost end of the well section to be reamed; after the ball is put in place, the ball No. 1 is put in and pumped for circulation, the pump pressure is suddenly increased when the ball No. 1 descends and sits on the lower sliding sleeve, the lower sliding sleeve shears a second shearing pin connected with the hydraulic cylinder under the action of hydraulic pressure and then descends and sits on the lower sliding sleeve seat, and the bypass hole is exposed; at the moment, a pump is stopped to start the rotary table, drilling fluid flows into a hydraulic cylinder through a bypass hole, the hydraulic cylinder and the central tube are pushed to move upwards together to drive the reaming blade to extend out along the blade slideway for reaming operation, meanwhile, a spring seat is driven to compress and store energy for a recovery spring, after the reaming blade slides up along the blade slideway to a proper position, an upper stop block and a limiting ring move together to the top end of the blade mounting groove, a hydraulic cylinder runner is aligned with a lower nozzle, the pressure of a slurry pump drops suddenly, and at the moment, the reamer is considered to meet the reaming requirement, the pump is started and drilling pressure is slowly applied, and reaming operation is started;
after reaming: stopping the pump and lifting the pump, pushing the spring seat, the central pipe and the hydraulic cylinder to return by the recovery spring, and simultaneously driving the reaming blades to recover into the reamer body along the blade slide way; when rock debris is deposited in the blade sliding groove, the reaming blade is blocked in the recovery process and cannot be recovered by elasticity: and (3) putting the No. 2 ball into the pump starting circulation, after the No. 2 ball descends in place, sitting on the upper sliding sleeve, shearing off the first shearing pin to descend under the action of hydraulic pressure, pushing the central pipe to drive the reaming cutter blade to retract, and after the upper sliding sleeve descends in place, exposing the upper nozzle, wherein the pressure of a slurry pump is suddenly reduced, and the recovery of the reaming cutter blade is finished.
In a reaming operation: if rock properties of the well wall are soft and hard staggered, and the reamer is contracted, the hydraulic cylinder flow channel is staggered with the lower nozzle, the pump pressure of the slurry pump rises, the pump is stopped and lifted, then the pump is started to put down again, and the reaming is repeatedly carried out until the pump pressure is normal and then the drilling is continuously put down.
Compared with the prior art, the hydraulic reamer for geological drilling and the using method thereof have the following beneficial effects that:
1. the thrust required by the opening of the reaming blades is completely provided by the upward driving of the hydraulic cylinder by the pressure of the drilling fluid, but is opened by utilizing differential pressure instead of throttling and pressure reduction, has low requirements on the pressure and the discharge capacity of the slurry pump, and is suitable for being used in the geological industry.
2. The reaming operation is carried out after the shear pin is sheared by the pressure build-up of the throwing ball, the full-displacement pump can be directly used for reaming when the shearing pin is blocked in the lowering stage, and the risk of blocking caused by the fact that the reamer is opened in advance due to overlarge displacement is avoided.
3. By adopting the design of double recovery mechanisms, the spring recovery device is used as a primary recovery mechanism, when the spring pushes the reaming blade to recover the reamer body after the pump is stopped, if rock debris is blocked in a blade slideway and the spring elasticity is not enough to push the reaming blade to recover, the upper sliding sleeve is driven by hydraulic pressure to push the central tube to move downwards through the pitching pressure-out to drive the reaming blade to recover the reamer body, so that the reamer is safer and more reliable.
4. The bottom of the blade mounting groove is provided with a chip removal slideway, so that large-particle rock chips deposited at the bottom of the blade mounting groove can be pushed to slide out along the slideway when the reaming blade is recovered, and the lower stop block is prevented from being clamped.
5. When lifting, if necessary, a circulation throwing ball can be established, then the pump is opened at full displacement, and simultaneously, the reamer wing is ensured to be retracted into the reamer body.
6. A rigid limiting mode is not adopted, complex accidents caused by the fact that the reaming cutter blade cannot be retracted due to the fact that the limiting device is reset and invalid are prevented, whether a sugarcoated haw hole is formed or not is judged through pump pressure change, if the pump pressure is increased, the cutter blade retracts, the cutter blade is lifted up until the pump pressure returns to be normal, and then the reaming is put down again, and therefore the reaming quality is guaranteed.
7. The upper part of the reaming blade is provided with cutting teeth, so that the function of back reaming can be realized.
8. In the reaming operation process, the acting force of the well wall rock is shared by the plurality of slide ways on the tool body and the upper limit of the sliding chute, and the safety is better unlike other reamers which are shared by a central pipe or a shaft pin.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic illustration of a hydraulic reamer for geological drilling according to the present invention;
FIG. 2 is an enlarged view of section I of FIG. 1 in accordance with the present invention;
FIG. 3 is an enlarged view of section II of FIG. 1 in accordance with the present invention;
FIG. 4 is an enlarged view of section III of FIG. 1 in accordance with the present invention;
FIG. 5 is a front view of a reamer blade provided in accordance with the present invention;
FIG. 6 is a side view of a reamer blade provided in accordance with the present invention;
FIG. 7 is a cross-sectional view A-A of FIG. 6 in accordance with the present invention;
FIG. 8 is a side view of a blade mounting slot provided in accordance with the present invention;
FIG. 9 is a cross-sectional view B-B of FIG. 8 in accordance with the present invention;
FIG. 10 is a schematic pre-reaming configuration of a method of using a hydraulic reamer for geological drilling according to the present invention;
FIG. 11 is a schematic diagram illustrating a configuration of a hydraulic reamer for geological drilling in accordance with the present invention in which the reamer is resiliently retracted by a recoil action;
FIG. 12 is a schematic diagram of a post-reaming forced recovery configuration of a method of using a hydraulic reamer for geological drilling according to the present invention.
Wherein:
1 is a reamer body; 2, a limiting mounting pore channel; 3, a blade mounting groove; 4 is a blade sliding groove; 5 is a chip removal slideway; 6 is an upper nozzle; 7 is a lower nozzle; 8 is a first shear pin; 9 is an upper sliding sleeve; 10 is a central tube; 11 is a limit ring; 12 is a first set screw; 13 is an upper stop block; 14 is a recovery spring; 15 is a spring seat; 16 is a hydraulic cylinder; 17 is a second set screw; 18 is a lower stop block; 19 is a hydraulic cylinder flow passage; 20 is a bypass hole; 21 is a second shear pin; 22 is a lower sliding sleeve; 23 is a lower sliding sleeve seat; 24 is a lower positioning joint; 25 is a reaming blade; 26 is a blade slideway; 27 is a diversion trench; 28 are gauge protection teeth; 29 is a PDC cutting tooth; 30 is a first O-shaped sealing ring; 31 is a second O-shaped sealing ring; 32 is a third O-shaped sealing ring; 33 is a fourth O-shaped sealing ring; 34 is ball number 1; 35 is ball number 2.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 9, an embodiment of the invention discloses a hydraulic reamer for geological drilling, comprising:
a reamer body 1; the reamer body 1 is provided with a stepped limiting installation pore passage 2; the reamer body 1 is uniformly provided with a plurality of blade mounting grooves 3 along the circumference, and two side walls of the blade mounting grooves 3 are provided with blade sliding grooves 4; the bottom of the blade mounting groove 3 is provided with a chip removal slideway 5; the upper part of the reamer body 1 is provided with an upper nozzle 6, and the lower part is provided with a lower nozzle 7; an upper sliding sleeve 9 for plugging the upper nozzle 6 is fixed on the upper part of the limiting mounting hole channel 2 through a first shearing pin 8;
a central tube 10; the central tube 10 is coaxially sleeved in the limiting installation pore channel 2 and is provided with a limiting ring 11 which radially protrudes into the blade installation groove 3; the limiting ring 11 is connected with an upper stop block 13 through a first set screw 12; a recovery spring 14 and a spring seat 15 are sleeved on the outer side of the upper part of the central tube 10, and the recovery spring 14 and the spring seat 15 are tightly propped between the stepped surface of the limiting installation pore channel 2 and the top surface of the limiting ring 11;
a hydraulic cylinder 16; the upper part of the hydraulic cylinder 16 is sleeved outside the bottom end of the central tube 10 and is abutted against the bottom edge of the central tube 10 through a step surface; the outer side wall of the top end of the hydraulic cylinder 16 is connected with a lower stop block 18 positioned in the blade mounting groove 3 through a second set screw 17; the upper part of the hydraulic cylinder 16 plugs the lower nozzle 7 and is provided with a hydraulic cylinder flow passage 19 dislocated with the lower nozzle 7, and the lower part of the hydraulic cylinder 16 is provided with a bypass hole 20; a lower sliding sleeve 22 for plugging the bypass hole 20 is fixed on the inner wall of the lower part of the hydraulic cylinder 16 through a second shearing pin 21; the lower part of the hydraulic cylinder 16 is sleeved on the inner side of the top end of the lower sliding sleeve seat 23 and is abutted against the top edge of the lower sliding sleeve seat 23 through a stepped surface; the bottom end of the lower sliding sleeve seat 23 is abutted with a lower positioning joint 24, and the lower positioning joint 24 is in threaded connection with the bottom end of the reamer body 1;
a reaming blade 25; the reaming blade 25 is arranged in the blade mounting groove 3; the reaming blade 25 has a blade slideway 26 connected with the blade runner 4 in a sliding way; the reaming blade 25 abuts between the upper stop 13 and the lower stop 18.
In order to further optimize the technical scheme, the middle part of the outer side of the reaming blade 25 is longitudinally provided with a flow guide groove 27; the transverse middle part of the reaming wing 25 is provided with gauge teeth 28, and two sides are provided with PDC cutting teeth 29.
In order to further optimize the technical scheme, the number of the blade mounting grooves 3 is 3; the number of the upper nozzles 6, the lower nozzles 7 and the hydraulic cylinder flow channels 19 is 3; the number of the first shearing pins 8 and the number of the second shearing pins 21 are 3; the number of the first set screw 12 and the second set screw 17 is 3; the number of the bypass holes 20 is 3.
In order to further optimize the technical scheme, a first O-shaped sealing ring 30 is sleeved on the connecting surface of the upper part of the hydraulic cylinder 16 and the outer side of the bottom end of the central tube 10; a second O-shaped sealing ring 31 and a third O-shaped sealing ring 32 are sleeved on the connecting surface of the upper part of the hydraulic cylinder 16 and the limiting mounting pore channel 2 at intervals, and a hydraulic cylinder flow channel 19 is positioned between the second O-shaped sealing ring 31 and the third O-shaped sealing ring 32; the connection surface of the lower sliding sleeve seat 23 and the limiting installation pore channel 2 is sleeved with a fourth O-shaped sealing ring 33.
The invention provides a using method of a hydraulic reamer for geological drilling, which comprises the following steps:
before reaming, the method comprises the following steps: installing the top end of the reamer body 1 at the lower end of the drilling tool assembly, installing a drill bit or a mill shoe on the lower positioning joint 24, and lowering the drill bit or the mill shoe to the uppermost end of the well section to be reamed; after the ball 34 is put in place, the pump is started to circulate, the pump pressure is suddenly increased when the ball 34 is descended and sits on the lower sliding sleeve 22, and under the action of hydraulic pressure, the lower sliding sleeve 22 is descended and sits on the lower sliding sleeve seat 23 after shearing the second shearing pin 21 connected with the hydraulic cylinder 16, and the bypass hole 20 is exposed; at the moment, the pump is stopped, the turntable is started, drilling fluid all flows into the hydraulic cylinder 16 through the bypass hole 20, the hydraulic cylinder 16 and the central pipe 10 are pushed to move upwards together, the reaming blade 25 is driven to extend out along the blade slideway 26 for reaming, meanwhile, the spring seat 15 is driven to compress and store energy for the recovery spring 14, after the reaming blade 25 slides upwards along the blade slideway 26 to a proper position, the upper stop block 13 and the limiting ring 11 move together to the top end of the blade mounting groove 3, the hydraulic cylinder runner 19 is aligned with the lower nozzle 7, the pressure of the slurry pump drops suddenly, at the moment, the reamer is considered to meet the reaming requirement, the pump is started, drilling pressure is slowly applied, and reaming operation is started, as shown in fig. 10;
after reaming: stopping the pump and lifting the pump, pushing the spring seat 15, the central tube 10 and the hydraulic cylinder 16 to return by the recovery spring 14, and simultaneously driving the reaming blades 25 to recover into the reamer body 1 along the blade slide way 16, as shown in fig. 11; when rock debris is deposited in the blade sliding groove 4 and causes the reaming blade 25 to be blocked in the recovery process and cannot be recovered by elasticity: and (3) putting the No. 2 ball 35 into the slurry pump to start a pump cycle, putting the No. 2 ball 35 on the upper sliding sleeve 9 after descending to the right position, shearing the first shearing pin 8 to descend under the action of hydraulic pressure, pushing the central pipe 10 to drive the reaming cutter wing 25 to retract, exposing the upper nozzle 6 after the upper sliding sleeve 9 descends to the right position, and then suddenly reducing the pressure of the slurry pump to finish the recovery of the reaming cutter wing 25, as shown in fig. 12. If the pump is started to circulate in the ascending process, the No. 2 ball 35 can be put in, and the circulation can be carried out after the upper sliding sleeve 9 descends in place.
In a reaming operation: if rock properties of the well wall are soft and hard staggered, and the reamer is contracted, the hydraulic cylinder flow passage 19 is staggered with the lower nozzle 7, the pump pressure of the slurry pump rises, the pump is stopped and lifted, then the pump is started to lower again, and the drilling and reaming are repeatedly carried out until the pump pressure is normal and then the drilling and reaming are continuously carried out.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A hydraulic reamer for geological drilling, comprising:
a reamer body (1); the reamer body (1) is provided with a stepped limiting installation pore channel (2); the reamer body (1) is uniformly provided with a plurality of blade mounting grooves (3) along the circumference, and two side walls of the blade mounting grooves (3) are provided with blade sliding grooves (4); the bottom of the blade mounting groove (3) is provided with a chip removal slideway (5); the upper part of the reamer body (1) is provided with an upper nozzle (6), and the lower part of the reamer body is provided with a lower nozzle (7); an upper sliding sleeve (9) for plugging the upper nozzle (6) is fixed on the upper part of the limiting mounting pore channel (2) through a first shearing pin (8);
a central tube (10); the central tube (10) is coaxially sleeved in the limiting mounting hole channel (2) and is provided with a limiting ring (11) which radially protrudes into the blade mounting groove (3); the limiting ring (11) is connected with an upper stop block (13) through a first set screw (12); a recovery spring (14) and a spring seat (15) are sleeved on the outer side of the upper part of the central tube (10), and the recovery spring (14) and the spring seat (15) are tightly propped between the step surface of the limiting installation pore channel (2) and the top surface of the limiting ring (11);
a hydraulic cylinder (16); the upper part of the hydraulic cylinder (16) is sleeved outside the bottom end of the central tube (10) and is abutted against the bottom edge of the central tube (10) through a stepped surface; the outer side wall of the top end of the hydraulic cylinder (16) is connected with a lower stop block (18) positioned in the blade mounting groove (3) through a second set screw (17); the upper part of the hydraulic cylinder (16) seals the lower nozzle (7), and is provided with a hydraulic cylinder flow passage (19) which is staggered with the lower nozzle (7), and the lower part of the hydraulic cylinder (16) is provided with a bypass hole (20); a lower sliding sleeve (22) for plugging the bypass hole (20) is fixed on the inner wall of the lower part of the hydraulic cylinder (16) through a second shearing pin (21); the lower part of the hydraulic cylinder (16) is sleeved on the inner side of the top end of the lower sliding sleeve seat (23) and is abutted against the top edge of the lower sliding sleeve seat (23) through a stepped surface; the bottom end of the lower sliding sleeve seat (23) is abutted against a lower positioning joint (24), and the lower positioning joint (24) is in threaded connection with the bottom end of the reamer body (1);
a reaming blade (25); the reaming blade (25) is arranged in the blade mounting groove (3); the reaming blade (25) is provided with a blade slideway (26) which is connected with the blade sliding groove (4) in a sliding way; the reaming blade (25) is tightly pressed between the upper stop block (13) and the lower stop block (18).
2. The hydraulic reamer for geological drilling as recited in claim 1, wherein a flow guide groove (27) is longitudinally formed in the middle of the outer side of the reamer wing (25); the transverse middle part of the reaming blade (25) is provided with gauge protection teeth (28), and two sides of the reaming blade are provided with PDC cutting teeth (29).
3. The hydraulic reamer for geological drilling as claimed in claim 1, wherein the number of blade mounting slots (3) is 3.
4. The hydraulic reamer for geological drilling as claimed in claim 1, wherein the number of said upper nozzles (6), said lower nozzles (7) and said hydraulic cylinder channels (19) is 3 each.
5. A hydraulic reamer for geological drilling according to claim 1, characterized in that the number of said first shear pins (8) and of said second shear pins (21) is 3 each.
6. A hydraulic reamer for geological drilling according to claim 1, characterized in that said first set screw (12) and said second set screw (17) are each 3 in number.
7. A hydraulic reamer for geological drilling according to claim 1, characterized in that said number of bypass openings (20) is 3.
8. A hydraulic reamer for geological drilling as claimed in any one of claims 1 to 7, wherein a first O-ring (30) is fitted over the upper part of the hydraulic cylinder (16) in connection with the outer side of the bottom end of the central tube (10); a second O-shaped sealing ring (31) and a third O-shaped sealing ring (32) are sleeved on the connecting surface of the upper part of the hydraulic cylinder (16) and the limiting mounting pore channel (2) at intervals, and the hydraulic cylinder flow channel (19) is positioned between the second O-shaped sealing ring (31) and the third O-shaped sealing ring (32); and a fourth O-shaped sealing ring (33) is sleeved on the connecting surface of the lower sliding sleeve seat (23) and the limiting mounting hole channel (2).
9. A method of using the hydraulic reamer for geological drilling as claimed in any one of claims 1-8, wherein:
before reaming, the method comprises the following steps: installing the top end of the reamer body (1) at the lower end of the drilling tool assembly, installing a drill bit or a mill shoe on a lower positioning joint (24), and lowering the reamer body to the uppermost end of a well section to be reamed; after the ball is put in place, the ball (34) No. 1 is put in and the pump is started to circulate, the pump pressure is increased suddenly when the ball (34) No. 1 is seated on the lower sliding sleeve (22) downwards, and under the action of hydraulic pressure, the lower sliding sleeve (22) cuts off a second cutting pin (21) connected with the hydraulic cylinder (16) and then is seated on the lower sliding sleeve seat (23) downwards, and the bypass hole (20) is exposed; at the moment, a pump is stopped to start a turntable, drilling fluid flows into a hydraulic cylinder (16) through a bypass hole (20), the hydraulic cylinder (16) and a central pipe (10) are pushed to move upwards together, a reaming blade (25) is driven to extend out along a blade slide way (26) to perform reaming operation, meanwhile, a spring seat (15) is driven to perform compression energy storage on a recovery spring (14), after the reaming blade (25) slides up along the blade slide way (26) to a proper position, an upper stop block (13) and a limiting ring (11) move together to the top end of a blade mounting groove (3), a hydraulic cylinder flow channel (19) is aligned with a lower nozzle (7), the pressure of a slurry pump drops suddenly, the reamer is considered to meet the reaming requirement, the pump is started and drilling pressure is slowly applied to start reaming operation;
after reaming: stopping the pump and lifting the pump, pushing the spring seat (15), the central pipe (10) and the hydraulic cylinder (16) to return by the recovery spring (14), and simultaneously driving the reaming blades (25) to retract into the reamer body (1) along the blade slide way (16); when rock debris is deposited in the blade sliding groove (4) and is blocked in the recovery process of the reaming blade (25) and cannot be recovered by elasticity: and (3) putting a No. 2 ball (35) into the slurry pump, starting the pump to circulate, descending the No. 2 ball (35) in place, sitting on the upper sliding sleeve (9), shearing the first shearing pin (8) to descend under the action of hydraulic pressure, pushing the central pipe (10) to drive the reaming wing (25) to withdraw, descending the upper sliding sleeve (9) in place, exposing the upper nozzle (6), and then suddenly reducing the pressure of the slurry pump to finish the recovery of the reaming wing (25).
10. A method of using a hydraulic reamer for geological drilling according to claim 9 wherein, in reaming: if rock properties of the well wall are soft and hard staggered, and the reamer is contracted, a hydraulic cylinder flow passage (19) and a lower nozzle (7) are staggered, the pump pressure of a slurry pump rises, the pump is stopped and lifted, then the pump is started to lower again, and the drilling is repeatedly pulled and scratched until the pump pressure is normal, and then the reamer is continuously lowered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110448064.8A CN113153159A (en) | 2021-04-25 | 2021-04-25 | Hydraulic reamer for geological drilling and use method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110448064.8A CN113153159A (en) | 2021-04-25 | 2021-04-25 | Hydraulic reamer for geological drilling and use method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114352207A (en) * | 2021-11-30 | 2022-04-15 | 中国矿业大学 | Hydraulic transmission type variable-diameter PDC drill bit |
| CN114562210A (en) * | 2022-03-08 | 2022-05-31 | 西南石油大学 | Drilling reamer for oil and gas well |
-
2021
- 2021-04-25 CN CN202110448064.8A patent/CN113153159A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114352207A (en) * | 2021-11-30 | 2022-04-15 | 中国矿业大学 | Hydraulic transmission type variable-diameter PDC drill bit |
| CN114352207B (en) * | 2021-11-30 | 2024-03-22 | 中国矿业大学 | Hydraulic transmission type diameter-variable PDC drill bit |
| CN114562210A (en) * | 2022-03-08 | 2022-05-31 | 西南石油大学 | Drilling reamer for oil and gas well |
| CN114562210B (en) * | 2022-03-08 | 2024-01-19 | 西南石油大学 | Oil gas well reamer while drilling |
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