CN114482856B - Drilling tool combination and method for near-horizontal directional drilling and stuck drilling treatment of complex fractured stratum - Google Patents
Drilling tool combination and method for near-horizontal directional drilling and stuck drilling treatment of complex fractured stratum Download PDFInfo
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- CN114482856B CN114482856B CN202111577207.1A CN202111577207A CN114482856B CN 114482856 B CN114482856 B CN 114482856B CN 202111577207 A CN202111577207 A CN 202111577207A CN 114482856 B CN114482856 B CN 114482856B
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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
- E21B7/046—Directional drilling horizontal drilling
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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
- E21B10/602—Drill bits characterised by conduits or nozzles for drilling fluids the bit being a rotary drag type bit with blades
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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
- E21B10/61—Drill bits characterised by conduits or nozzles for drilling fluids characterised by the nozzle structure
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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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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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
- E21B44/00—Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions
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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
- E21B47/00—Survey of boreholes or wells
- E21B47/02—Determining slope or direction
- E21B47/022—Determining slope or direction of the borehole, e.g. using geomagnetism
Abstract
The invention discloses a drilling tool combination for near-horizontal directional drilling and stuck drill treatment of a complex broken stratum, which comprises a stuck releasing drilling rod, a measurement while drilling system, a screw drilling tool and a stuck releasing drilling bit which are sequentially connected; the unfreezing drill rod comprises an unfreezing drill rod body and a central communication assembly; the measurement while drilling system comprises a control unit, and a transmission unit and a measurement unit which are connected with the control unit; the unfreezing drill bit comprises an unfreezing drill bit body and at least two jet flow rock crushing assemblies; the central through hole of the unfreezing drill bit body is a flow passage. The invention adopts a mode of processing the stuck drill hole and stuck drill of the stuck hole by constructing the stuck releasing hole below the stuck drill hole, does not generate higher reciprocating feeding force, pulling force and rotary torque on a drilling tool in the stuck drill hole, and can effectively avoid the problems that the drilling tool is easy to generate fatigue damage and the drilling safety is low when the collapsed hole and stuck drill are salvaged and processed by strong force. The drilling tool is applied to drill sticking treatment to construct a stuck-releasing hole, the drilling sticking treatment period is shortened by more than 50% compared with that of casing milling and fishing, and the drilling sticking treatment period is greatly shortened.
Description
Technical Field
The invention belongs to the field of underground coal mine gallery drilling, and particularly relates to a drilling tool assembly and a method for near-horizontal directional drilling and stuck drilling treatment of a complex broken stratum.
Background
The complicated broken coal measure strata are widely distributed in coal mine areas in China, have the characteristics of stratum breakage, high drilling pressure, difficult discharge of drilling slag and the like, are easy to generate drilling clamping accidents in the nearly horizontal directional drilling process, mainly comprise hole collapse clamping drills, mudstone reducing clamping drills and drilling cutting deposition clamping drills, wherein the hole collapse clamping drills are one of the hole accidents with high occurrence frequency, and the generation reasons are as follows: the drilling tool is blocked by local rock body instability and collapse of the hole wall, so that the rotation and the lifting of the drilling tool are blocked, and the drilling tool can be completely blocked (can not rotate and can not be lifted down) in serious conditions, so that the drilling tool can not move normally.
When the near-horizontal directional drilling of the complex broken coal measure strata causes the blockage of the hole, two methods of powerful salvage and casing milling salvage are generally adopted for processing. The strong salvage adopts a method of combining the quick change of the forward rotation speed and the quick and repeated conversion of the quick tripping of the drill bit, so that the drilling tool at the position of the hole collapse and the drill bit clamp generates the extrusion and rolling action on collapse scraps to loosen the drilling tool, thereby achieving the purpose of releasing the clamp. The method applies a special milling salvaging drilling tool, adopts a rotary drilling process to extract a directional drilling tool in a hole and perforates a collapsed hole and a drill clamping part, thereby respectively and sequentially lifting the salvaging drilling tool and the directional drilling tool to finish the collapsed hole and drill clamping treatment. However, the following problems exist when handling stuck-in accidents by applying strong fishing and casing milling fishing:
(1) The drilling tool is easy to generate fatigue damage, and the drilling safety is low. When the collapse hole clamping drill is salvaged and treated by strong force, the drilling tool in the hole is subjected to reciprocating high feeding force, pulling force and rotation torque, the stress condition is complex, fatigue damage is easy to occur, the drilling tool is likely to break, secondary accidents in the hole are caused, the complexity of accident treatment is aggravated, and the drilling safety is reduced.
(2) The sticking treatment efficiency is low, and the drilling period is long. When the sleeve milling and salvaging treatment of the collapsed hole jamming drilling is adopted, the diameter specification of the sleeve milling drilling tool is larger than that of the jamming drilling tool, the sleeve milling drilling rotary torque is large, the sleeve milling drilling efficiency is low, and the treatment of the collapsed hole jamming drilling period is long; the diameter of the formed hole of the sleeve milling drilling tool is large, the stability of the hole wall is poor, the annular space gap between the sleeve milling drilling tool and the drilled hole is small, hole collapse and drill clamping are easy to occur in the sleeve milling drilling process, and the drilling risk is high.
Disclosure of Invention
Aiming at the problems of easy fatigue damage of drilling tools, low drilling safety, low drilling blocking treatment efficiency and long drilling period of the existing hole-collapsing and drilling blocking treatment method under the coal mine, the designer of the invention considers the defects and comprehensively engages the experience and achievement of related industries through careful research and design, and provides the drilling tool combination and method for the near-horizontal directional drilling and blocking treatment of the complicated broken stratum.
In order to achieve the purpose, the invention adopts the following technical scheme to solve the problem:
on one hand, the invention provides a drilling tool assembly for the nearly horizontal directional drilling and stuck drilling treatment of a complex broken stratum, which comprises a stuck releasing drilling rod, a measurement while drilling system, a screw drilling tool and a stuck releasing drilling bit which are sequentially connected;
the unfreezing drill rod comprises an unfreezing drill rod body and a central communication assembly arranged in a central through hole of the unfreezing drill rod body; the measurement while drilling system comprises a control unit, and a transmission unit and a measurement unit which are connected with the control unit, wherein: the control unit is used for controlling the measuring unit to measure the track parameters of the unfreezing hole and the drilling and controlling the transmission unit to transmit the measuring signals; the transmission unit is connected with the central communication assembly and used for supplying power to the measurement while drilling system through the central communication assembly and transmitting a measurement signal to the orifice; the measuring unit is used for measuring the track parameters of the unfreezing hole drilling;
the unfreezing drill bit comprises an unfreezing drill bit body and at least two jet flow rock crushing assemblies; the stuck releasing drill bit body is a stepped cylinder with a large front part and a small rear part, a plurality of front cutting teeth are uniformly arranged on the front end face of the stuck releasing drill bit body, a plurality of rows of annular wear-resistant layers are uniformly arranged on the circumferential side wall of the stuck releasing drill bit body, each row of annular wear-resistant layers comprises a plurality of wear-resistant alloy blocks at equal intervals, a slope surface is arranged at the step part of the stuck releasing drill bit body, and a plurality of rows of rear cutting teeth are uniformly arranged on the slope surface; the central through hole of the unfreezing drill bit body is a flow passage.
Furthermore, at least two jet flow assembly mounting through holes are uniformly formed in the circumferential direction of the side wall of the rear portion of the unfreezing drill bit body, the height direction of each mounting through hole is consistent with that of the unfreezing drill bit body and communicated with the central through hole of the unfreezing drill bit body, and a jet flow rock breaking assembly is mounted in each jet flow assembly mounting through hole respectively.
Furthermore, the jet rock crushing assembly comprises a jet nozzle, a spring, a sealing head and a limiting block, wherein the jet nozzle is a cylindrical body with one end provided with a first groove, the sealing head is a cylinder with one end provided with a second groove, the side wall of the other end of the sealing head is a conical surface, the jet nozzle and the sealing head are oppositely arranged, and two ends of the spring are respectively fixedly arranged in the first groove and the second groove; the limiting block is provided with a central through hole, and the central through hole is matched with one end of the conical surface of the sealing head in shape; the limiting block and the jet flow nozzle are respectively fixed on the inner walls of two ends of the jet flow assembly mounting through hole, one end of the conical surface of the sealing head is positioned in the central through hole of the limiting block, and the two ends are tightly attached under the action of the spring; a plurality of jet flow channels are uniformly arranged on the circumference of the jet flow nozzle.
Furthermore, the number of the jet flow channels on the jet flow nozzle is 3, and the jet flow channels are arc-shaped.
On the other hand, the invention also provides a method for the near-horizontal directional drilling and sticking treatment of the complex fractured formation, which is carried out by adopting the near-horizontal directional drilling and sticking treatment drilling tool combination for the complex fractured formation, and specifically comprises the following steps:
step 1, determining the position of a stuck drill point;
step 4, drilling and unfreezing: processing the region to be unblocked until the unblocked hole is communicated with the stuck drill hole, so that a large amount of drill residues generated by the stuck drill in the stuck drill hole can pass through the unblocked hole and discharge out of the hole, and after the water return at the orifice of the unblocked hole is normal, indicating that the position of the stuck drill point is processed completely, blocking the drill hole and unblocking;
step 5, withdrawing the drill tool: and withdrawing the drilling tool assembly from the inside of the stuck hole, connecting the drill rod with the hole opening after the drill is moved to align the stuck hole, and withdrawing the stuck drill.
Further, in the step 1, the drilling depth is set to be L 1 The time required for the flushing fluid to flow through the screw drill and the drill bit so that the pump pressure rises significantly is t 1 The time t is the time required for the flushing fluid to reach the drilling point sticking position so as to cause the abnormal rapid rise of the pump pressure 2 The flow velocity of flushing fluid in the annular space between the drill string and the hole wall is v 0 Distance L from the point of sticking to the bottom of the hole 2 Is v is 0 (t 2 -t 1 ) Calculating the depth L of the stuck point by using the following formula 3 ＝L 1 -L 2 ＝L 1 -v 0 (t 2 -t 1 )。
Further, in the step 4, in the stuck hole unfreezing process, the pump pressure is adjusted to be 1.5 times or more of that in normal drilling.
Compared with the prior art, the invention has the following technical effects:
(1) The mode of processing the stuck drill hole and sticking the drill is adopted, the stuck hole is constructed and released below the stuck drill hole, the drilling tool in the stuck drill hole cannot generate higher reciprocating feeding force, pulling force and rotation torque, the problems that the drilling tool is easy to generate fatigue damage and the drilling safety is low when the collapsed hole and the drill hole are subjected to powerful salvaging can be effectively avoided, and the drilling safety is obviously improved.
(2) The drilling tool is applied to the stuck hole treatment, the diameter of the formed hole is small compared with that of a drilling tool for casing milling and salvaging, the drilling speed is high, the drilling tool sticking treatment period is shortened by more than 50% compared with that of the casing milling and salvaging, and the drilling tool sticking treatment period is greatly shortened.
(3) The first-stage rock crushing is realized by the rotary rock crushing of the front cutting teeth of the unfreezing drill bit; the high-pressure water jet rock crushing formed by the jet rock crushing component realizes secondary rock crushing when the drilling slag formed by the primary rock crushing moves backwards; the arris that the cutting face of the unblock drilling rod lateral wall formed in the in-process that the drilling slag that second grade detritus obtained moves to the drill way realizes tertiary detritus at rotatory in-process, and carries out the overall process detritus through the length of unblock drilling rod, and the detritus effect is stronger, changes the discharge drilling slag. Above-mentioned tertiary detritus mode carries out the hierarchical processing to the brill sediment, can make the brill sediment discharge from releasing the card drilling smoothly, guarantees the sticking of tool treatment effect, improves sticking of tool treatment effeciency.
Drawings
FIG. 1 is a schematic diagram of the handling of hole collapse and stuck drilling accidents.
FIG. 2 is a block diagram of an unfreezing drilling assembly.
Fig. 3 is a structure diagram of the stuck drill pipe.
FIG. 4 is a block diagram of the stuck bit.
Fig. 5 is a view showing the structure of the fluidic module, in which (a) is the fluidic module and (b) is a view in the direction a of (a).
In the above figures: the drilling tool comprises a 1-unfreezing drill rod, a 2-measurement while drilling system, a 3-screw drilling tool, a 4-unfreezing drill bit, a 101-unfreezing drill rod body, a 102-center communication component, a 201-transmission unit, a 202-control unit, a 203-measurement unit, a 401-unfreezing drill bit body, a 402-front cutting tooth, a 403-wear-resistant alloy block, a 404-rear cutting tooth, a 405-jet rock breaking component, a 406-jet component mounting groove, a 407-flow passage, a 4051-jet spray head, a 4052-jet passage, a 4053-spring, a 4054-sealing head and a 4055-limiting block.
The invention is further explained below with reference to the drawings and the detailed description.
Detailed Description
The invention discloses a drilling tool assembly for near-horizontal directional drilling and stuck drill treatment of a complex broken stratum, which is shown in figure 2 and comprises a stuck releasing drilling rod 1, a measurement while drilling system 2, a screw drilling tool 3 and a stuck releasing drilling bit 4 which are sequentially connected.
Referring to fig. 3, the stuck release drill pipe 1 comprises a stuck release drill pipe body 101 and a central communication assembly 102 installed in a central through hole of the stuck release drill pipe body 101; preferably, a plurality of cutting surfaces (preferably three cutting surfaces) are machined on the outer circumference of the stuck releasing drill rod body 101, so that the drill rod body 101 has a special-shaped structure to strengthen slag discharge in a hole; the central communication assembly 102 is embodied as a central cable. In practical situations, the stuck releasing drill rod 1 is formed by connecting a plurality of same drill rods end to end, the drill rods are connected through threads to form the stuck releasing drill rod 1, and central communication components inside each drill rod are in butt joint and are communicated with each other to form a wired channel (namely, the central communication component 102) so as to provide power supply and communication channels for the measurement-while-drilling system 2.
Referring to fig. 2, the measurement while drilling system 2 includes a control unit 202, and a transmission unit 201 and a measurement unit 203 connected thereto, wherein: the control unit 202 adopts a control chip, which is a control terminal of the measurement while drilling system 2 and is used for controlling the measurement unit 203 to measure the drilling track parameters and controlling the transmission unit 201 to transmit the measurement signals; the transmission unit 201 is connected with the central communication assembly 102 and is used for supplying power to the measurement while drilling system 2 through the central communication assembly 102 and simultaneously transmitting a measurement signal to the orifice; the measuring unit 203 is provided with an acceleration sensor and an optical fiber gyro sensor, the acceleration sensor is used for measuring the inclination angle and the tool face angle parameter, the optical fiber gyro sensor is used for measuring the drilling hole orientation parameter, the interference of the ferromagnetic of the drilling tool assembly in the stuck drilling hole is avoided, and the accurate measurement and control of the drilling track of the stuck hole can be ensured.
Referring to fig. 4, the stuck freeing drill bit 4 comprises a freeing drill bit body 401 and at least two jet lithotripsy assemblies 405. The stuck releasing drill bit body 401 is a stepped cylinder with a large front part and a small rear part, a plurality of front cutting teeth 402 are uniformly arranged on the front end face of the stuck releasing drill bit body 401, a plurality of rows of annular wear-resistant layers are uniformly arranged on the circumferential side wall of the stuck releasing drill bit body 401, each row of annular wear-resistant layers comprises a plurality of equally-spaced wear-resistant alloy blocks 403, the step of the stuck releasing drill bit body 401 is a slope surface, and a plurality of rows of rear cutting teeth 404 are uniformly arranged on the slope surface. The central through hole of the stuck freeing bit body 401 is a flow passage 407; preferably, at least two jet assembly mounting through holes 406 are uniformly formed in the circumferential direction of the side wall of the rear portion of the stuck freeing bit body 401, the height direction of the mounting through holes 406 is consistent with that of the stuck freeing bit body 401 and is communicated with the central through hole of the stuck freeing bit body 401, and one jet detritus assembly 405 is mounted in each jet assembly mounting through hole 406.
Referring to fig. 5, the jet rock breaking assembly 405 includes a jet nozzle 4051, a spring 4053, a sealing head 4054 and a limiting block 4055, where the jet nozzle 4051 is a cylindrical body with a first groove at one end, the sealing head 4054 is a cylindrical body with a second groove at one end, and a sidewall of the other end is a conical surface, the jet nozzle 4051 and the sealing head 4054 are disposed oppositely, and two ends of the spring 4053 are respectively fixed in the first groove and the second groove; the stopper 4055 has a central through hole which is in shape fit with one end of the conical surface of the sealing head 4054; the limiting block 4055 and the jet flow nozzle 4051 are respectively fixed on the inner walls of two ends of the jet flow component mounting through hole 406, one end of the conical surface of the sealing head 4054 is positioned in the central through hole of the limiting block 4055, and the two ends are tightly attached under the action of the spring 4053; a plurality of jet flow channels 4052 are uniformly arranged on the circumference of the jet flow nozzle 4051 and used for enabling high-pressure jet flow entering the jet flow rock breaking component 405 to be ejected outwards; preferably, the number of the jet flow channels 4052 on the jet flow nozzle 4051 is 3, and the jet flow channels 4052 are arc-shaped, so that the rock breaking effect of the jet flow on the drilling slag is more uniform.
Above-mentioned garrulous rock subassembly of efflux 405 is out of work in the unfreezing hole work progress, just can form high-pressure water jet when carrying out the card drilling unfreezing, and its mode of operation conversion principle is: during drilling construction, the normal drilling pump pressure is not enough to push the sealing head 4054 and the spring 4053 to move, and flushing liquid cannot enter the jet flow rock crushing component 405, so that the jet flow rock crushing component 405 cannot form high-pressure water jet; when the stuck hole is unfreezed, the adjustable pump pressure is 1.5 times or more than that of normal drilling, the flushing liquid can push the sealing head 4054 and the spring 4053 to move, the flushing liquid enters the jet flow nozzle 4051 and is sprayed out through the jet flow channel 4052 to form high-pressure water jet.
Therefore, in the process of stuck drill treatment by adopting the design scheme of the stuck drill bit 4, the drilling tool assembly can form a three-level rock breaking mode: the front cutting teeth 402 of the stuck releasing drill bit 4 rotate to crush rocks to realize primary crushing; high-pressure water jet rock crushing formed by the jet rock crushing component 405 of the unfreezing drill bit 4 when the drilling slag formed by the first-stage rock crushing moves backwards, so that second-stage rock crushing is realized; and in the process that the drilling slag obtained by the second-stage rock crushing moves to the hole opening, the third-stage rock crushing is realized in the rotating process through the edge formed by the cutting surface on the side wall of the unfreezing drill rod 1, and the whole process of rock crushing is carried out through the length of the unfreezing drill rod 1, so that the rock crushing effect is stronger, and the drilling slag is easier to discharge. The drilling slag is graded by applying the three-level rock crushing mode of the drilling tool combination for stuck drill treatment, so that the drilling slag can be smoothly discharged from a stuck-releasing drill hole, and the drill sticking treatment effect is ensured.
The invention also discloses a method for processing the complex broken stratum near-horizontal directional drilling stuck drill, which realizes the stuck drill by using the drilling tool combination for processing the complex broken stratum near-horizontal directional drilling stuck drill, and concretely comprises the following steps:
step 1, determining the position of a stuck drill point. When the drilling sticking occurs in the nearly horizontal directional drilling, the flushing liquid reaches the position of the drilling sticking and cannot normally pass through, and the pumping pressure can be abnormally and quickly raised, so that the depth of the drilling sticking point can be calculated by the time required by the abnormal raising of the pumping pressure. Setting the drilling depth to L 1 The time required for the flushing fluid to flow through the screw drill and the drill bit so that the pump pressure rises significantly is t 1 The time t is the time required for the flushing fluid to reach the drilling point sticking position so as to cause the abnormal rapid rise of the pump pressure 2 The flow velocity of flushing fluid in the annular space between the drill string and the hole wall is v 0 Then the distance L from the drill point to the bottom of the hole 2 Is v is 0 (t 2 -t 1 ) Therefore, the depth L of the stuck point is calculated by the following formula 3 ＝L 1 -L 2 ＝L 1 -v 0 (t 2 -t 1 )。
And 2, opening holes in the hole positions by a moving machine. And (3) unscrewing the drill rod for clamping the drill hole at the orifice, moving the drilling machine to aim at the opening point below the clamping drill hole, taking the opening point as the orifice of the releasing clamp hole, applying the opening drilling tool to construct an opening hole section, and taking out the opening drilling tool after the construction reaches the designed depth.
And 3, releasing the stuck hole for construction. And (3) putting the drilling tool assembly into the hole formed in the step (2), applying the drilling tool assembly to construct below the stuck hole, and monitoring a stuck releasing hole track by using the measurement-while-drilling system (2) in the process until the construction is carried out to the stuck releasing depth according to the designed track to obtain a stuck releasing hole.
And 4, releasing the stuck drill hole. The drilling tool combination is applied to process the area to be stuck until the stuck releasing hole is communicated with the stuck drilling hole, so that a large amount of drilling slag generated by the stuck and stuck drilling of the stuck drilling hole passes through the stuck releasing hole and is discharged out of the hole, and the stuck drilling hole is released after the drill point position is processed after the water returning of the orifice of the stuck releasing hole is normal.
Preferably, in the stuck and drilled hole stuck freeing process, the pump pressure is adjusted to be 1.5 times or more of that in normal drilling. This operation allows the flushing fluid to move the sealing head 4054 and spring 4053 into the jet nozzle 4051 and out through the jet channel 4052 to form a high pressure jet.
In the process, the drilling tool combination forms a three-level rock crushing mode: the front cutting teeth 402 of the stuck releasing drill bit 4 rotate to crush rocks to realize primary crushing; high-pressure water jet rock crushing formed by the jet rock crushing component 405 of the unfreezing drill bit 4 when the drilling slag formed by the first-stage rock crushing moves backwards, so that second-stage rock crushing is realized; and in the process that the drilling slag obtained by the second-stage rock crushing moves to the hole opening, the third-stage rock crushing is realized in the rotating process through edges formed by the cutting surfaces on the side walls of the unfreezing drill rod 1, and the whole process of rock crushing is carried out through the length of the unfreezing drill rod 1, so that the rock crushing effect is stronger, and the drilling slag is easier to discharge. The drilling slag is graded by applying the three-level rock breaking mode of the drilling tool combination for stuck drill treatment, so that the drilling slag can be smoothly discharged from the stuck-releasing drill hole, and the stuck drill treatment effect is ensured.
And 5, withdrawing the drilling tool. And withdrawing the drilling tool assembly for stuck drill treatment from the stuck hole, connecting a hole drill rod after the drilling tool is moved to align the stuck hole, and withdrawing the drilling tool assembly in the stuck hole.
Claims (6)
1. The method is characterized in that a complex broken stratum near-horizontal directional drilling stuck drill treatment drilling tool combination is adopted, and the complex broken stratum near-horizontal directional drilling stuck drill treatment drilling tool combination comprises a stuck releasing drilling rod (1), a measurement while drilling system (2), a screw drilling tool (3) and a stuck releasing drilling bit (4) which are sequentially connected;
the unfreezing drill rod (1) comprises an unfreezing drill rod body (101) and a central communication assembly (102) arranged in a central through hole of the unfreezing drill rod body (101); the measurement while drilling system (2) comprises a control unit (202) and a transmission unit (201) and a measurement unit (203) connected with the control unit, wherein: the control unit (202) is used for controlling the measuring unit (203) to measure the track parameters of the unfreezing hole drilling and controlling the transmission unit (201) to transmit the measuring signals; the transmission unit (201) is connected with the central communication assembly (102) and used for supplying power to the measurement-while-drilling system (2) through the central communication assembly (102) and simultaneously transmitting a measurement signal to the orifice; the measuring unit (203) is used for measuring the track parameters of the unfreezing hole drilling;
the stuck freeing drill bit 4 comprises a stuck freeing drill bit body (401) and at least two jet lithotripsy assemblies (405); the stuck releasing drill bit comprises a stuck releasing drill bit body (401), a plurality of front cutting teeth (402) are uniformly arranged on the front end face of the stuck releasing drill bit body (401), a plurality of rows of annular wear-resistant layers are uniformly arranged on the circumferential side wall of the stuck releasing drill bit body (401), each row of annular wear-resistant layers comprises a plurality of wear-resistant alloy blocks (403) at equal intervals, a slope is arranged at the step of the stuck releasing drill bit body (401), and a plurality of rows of rear cutting teeth (404) are uniformly arranged on the slope; the central through hole of the stuck releasing drill bit body (401) is a flow passage (407);
the method specifically comprises the following steps:
step 1, determining the position of a stuck drill point;
step 2, opening holes in the hole positions by a moving machine: unscrewing a drill rod for clamping a drill hole at an orifice, moving a drilling machine to aim at a hole opening point below the drill hole for clamping, taking the drill rod as the orifice of a hole for releasing the clamp, applying a hole opening drilling tool to construct a hole opening section, and taking out the hole opening drilling tool after construction to a designed depth;
step 3, releasing the stuck hole construction: putting a drilling tool assembly into the hole formed in the step 2, constructing below the stuck drill hole, and monitoring a stuck releasing hole track by using a measurement while drilling system (2) in the process until the stuck releasing depth is reached according to the design track, so as to obtain a stuck releasing hole;
step 4, drilling and unfreezing: treating the region to be unblocked until the unblocking hole is communicated with the stuck drill hole, so that a large amount of drill residues generated by the stuck drill in the stuck drill hole pass through the unblocking hole and are discharged out of the hole, and after the water return of the orifice of the unblocking hole is normal, indicating that the position of the stuck drill point is treated, blocking the drill hole and unblocking;
step 5, withdrawing the drill tool: and withdrawing the drilling tool assembly from the inside of the stuck hole, connecting the drill rod with the hole opening after the drill is moved to align the stuck hole, and withdrawing the stuck drill.
2. The near-horizontal directional drilling stuck drill treatment method for the complex fractured formations according to claim 1, characterized in that at least two jet assembly mounting through holes (406) are uniformly arranged on the circumferential direction of the side wall at the rear part of the stuck freeing drill bit body (401), the height direction of the mounting through holes (406) is consistent with that of the stuck freeing drill bit body (401) and is communicated with the central through hole of the stuck freeing drill bit body (401), and one jet rock breaking assembly (405) is respectively mounted in each jet assembly mounting through hole (406).
3. The near-horizontal directional drilling and stuck drilling treatment method for the complex fractured strata is characterized in that the jet flow rock breaking component (405) comprises a jet flow nozzle (4051), a spring (4053), a sealing head (4054) and a limiting block (4055), wherein the jet flow nozzle (4051) is a cylindrical body with a first groove at one end, the sealing head (4054) is a cylindrical body with a second groove at one end, the side wall of the other end of the sealing head is a conical surface, the jet flow nozzle (4051) and the sealing head (4054) are oppositely arranged, and two ends of the spring (4053) are respectively fixedly installed in the first groove and the second groove; the limiting block (4055) is provided with a central through hole, and the central through hole is matched with one end of the conical surface of the sealing head (4054) in shape; the limiting block (4055) and the jet flow nozzle (4051) are respectively fixed on the inner walls of two ends of the jet flow assembly installation through hole (406), one end of the conical surface of the sealing head (4054) is located in the central through hole of the limiting block (4055), and the two ends are tightly attached under the action of the spring (4053); a plurality of jet flow channels (4052) are uniformly arranged on the periphery of the jet flow nozzle (4051).
4. The near-horizontal directional drilling stuck drill treatment method for the complicated fractured formation, according to claim 3, is characterized in that the number of the jet flow channels (4052) on the jet flow nozzle (4051) is 3, and the shape of the jet flow channels is arc-shaped.
5. The method for the near-horizontal directional drilling stuck drill treatment of the complicated fractured formation according to claim 1, wherein in the step 1, the drilling depth is set to be L 1 The time required for the flushing fluid to flow through the screw drill and the drill bit so that the pump pressure rises significantly is t 1 The time t required for the flushing fluid to reach the drilling point clamping position so that the pump pressure is abnormally and rapidly increased 2 The flow velocity of the flushing fluid in the drill string and hole wall annulus is v 0 Distance L from the point of sticking to the bottom of the hole 2 Is v 0 (t 2 -t 1 ) Calculating the depth L of the stuck point using the following formula 3 = L 1 - L 2 = L 1 - v 0 (t 2 -t 1 )。
6. The method for stuck near-horizontal directional drilling of complex fractured stratum according to claim 1, wherein in the step 4, during the stuck hole stuck freeing, the pump pressure is adjusted to be 1.5 times or more of that during normal drilling.
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