CN114293913B - Downhole friction-reducing and resistance-reducing tool and method based on mechanical decoupling - Google Patents
Downhole friction-reducing and resistance-reducing tool and method based on mechanical decoupling Download PDFInfo
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Abstract
The invention relates to a downhole friction-reducing and resistance-reducing tool and method based on mechanical decoupling, and belongs to the technical field of oil-gas resource drilling tools. The invention discloses a downhole friction-reducing and resistance-reducing tool and method based on mechanical decoupling, which comprises an upper shell, a lower connector and a drilling fluid return pipe, wherein the upper shell is connected with the lower shell through a mechanical decoupling mechanism; an unloading connecting assembly I, a torque axial reversing assembly and an unloading connecting assembly II are sequentially arranged in the lower shell; the upper shell is internally provided with a transfer positioning device I, a power input device, a torque increasing device I, a transfer positioning device II, a power separating device I, a torque increasing device II, a transfer positioning device III, a power separating device II, a torque increasing device III, a transmission shaft I and a transmission shaft II in sequence. The invention controls the working torque of the well descending friction resistance reducing tool by directly adjusting the drilling speed of the drill string by ground operators so as to realize sliding guide drilling under the condition of rotation of the drill string and solve the technical problems of high friction resistance, serious pressure bearing, low mechanical drilling speed, difficult horizontal section extension and the like of a complex structure well.
Description
Technical Field
The invention relates to a downhole friction-reducing and resistance-reducing tool and method based on mechanical decoupling, and belongs to the technical field of oil-gas resource drilling tools.
Background
Compared with the conventional vertical well, the horizontal section of the horizontal well can contact with a reservoir layer in a large area, the crude oil recovery rate is greatly improved, and the horizontal well is a key technology for developing unconventional oil and gas such as shale oil and gas, compact oil and gas, coal bed gas and the like. However, horizontal well drilling technology generally faces a series of challenges such as high drill string friction, severe pressure relief, low drilling rate, and limited horizontal section extension capability. The horizontal well drilling mainly adopts two drilling modes of sliding guide drilling and rotary drilling. When a sliding guide drilling mode is adopted, the screw drilling tool drives the drill bit to rotate under the driving of drilling fluid, and the screw drilling tool and the upper drill column slowly slide and advance relative to the well wall under the action of ground drilling pressure. The biggest problem existing in the mode is that on one hand, due to the influence of the self weight of the drill rod, the drill string at the bending well section and the horizontal section almost lies on the lower well wall, so that the sliding friction resistance of the drill string is increased sharply, and further the drill string is pushed to slide, and the consumed bit pressure is very large; on the other hand, the tool face is difficult to stabilize and the orientation requirement is difficult to meet. The existing drilling string friction reducing and resistance reducing technologies are various in types and different in resistance reducing effect, and effectively comprise a hydraulic oscillator, a drilling string torsional pendulum drilling system, a rotary steering tool and the like, but the hydraulic oscillator and the torsional pendulum drilling system are not ideal in effect, the rotary steering tool is high in cost and high in drilling clamping/burying risk, and a low-cost and efficient horizontal well friction reducing and resistance reducing technology is urgently needed to be developed.
The hydraulic oscillator is an effective friction and resistance reduction mode with low cost, but is limited by ground pump pressure, self vibration energy and the like, so that the resistance reduction effect of the hydraulic oscillator in a long horizontal section horizontal well is poor; when a plurality of axial oscillators are connected, larger circulating pressure consumption is brought, and the loss is not compensated; the degree of adjustment to the tool face during the orientation process is limited and cannot be adapted to complex drilling requirements.
The drill stem torsional pendulum drilling system is also a horizontal well friction reduction and resistance reduction method used at the present stage, and the limitation is that under the action of the drill stem torsional pendulum drilling system, the axial friction force distribution of a drill stem under a sliding drilling well is divided into 3 areas: a ground torsional oscillation effect sweep region, a static friction region that keeps the steering motor toolface unchanged, and a reaction torque effect region for the propagation distance of the drill bit and power tool reaction torque. The friction resistance of the static friction area is still high and the tool face must remain stable; for a deep horizontal well with a long horizontal section, the problems that the friction resistance/torque of a drill column is continuously increased, the torsional pendulum drag reduction effect is poor, the regulation and control capability of a tool surface is weakened and the like are more and more obvious due to the fact that the well depth and the horizontal section are continuously increased, and the drag reduction effect is difficult to effectively improve even by strengthening torsional pendulum drilling parameters.
Therefore, a more efficient friction reducing and drag reducing tool suitable for a horizontal well with a long horizontal section is needed to be designed.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention provides a downhole friction-reducing and resistance-reducing tool based on mechanical decoupling and a method thereof, wherein the downhole friction-reducing and resistance-reducing tool is mounted at a position 100-150 m away from a drill bit on the basis of a conventional guide drilling tool combination consisting of a screw drilling tool and a Measurement While Drilling (MWD) system, and the tool is further controlled to realize the separation of the torque of a downhole drill string by adjusting the drilling speed of the drill string; the tool can replace a rotary steering drilling system, realizes sliding steering drilling under the rotation state of a drill column, and is used for directional drilling of wells with complex structures such as directional wells, horizontal wells, extended reach wells and the like.
The technical scheme provided by the invention for solving the technical problems is as follows: a downhole friction-reducing and resistance-reducing tool comprises an upper shell, a lower joint and a drilling fluid backflow rod axially arranged on the upper shell, the lower shell and the lower joint;
an unloading connecting assembly I, a torque axial reverse assembly and an unloading connecting assembly II are sequentially arranged in the lower shell; one end of the lower connector is arranged in the unloading connecting assembly II and is connected with the torque axial reverse assembly, an output shaft sleeved on a drilling fluid return pipe is further arranged in the lower connector, and one end of the upper shell is arranged in the unloading connecting assembly I;
the upper shell is internally provided with a transfer positioning device I, a power input device, a torque increasing device I, a transfer positioning device II, a power separating device I, a torque increasing device II, a transfer positioning device III, a power separating device II, a torque increasing device III, a transmission shaft I and a transmission shaft II which are sleeved on the drilling fluid return pipe in sequence; the outer circular surface of the power input device is connected with the inner wall of the upper shell through a wedge key, the torque increasing device I is connected with one side of the power input device, the torque increasing device II is connected with one side of the power separating device I, the torque increasing device III is connected with one side of the power separating device II, the transfer positioning device I, the power input device, the torque increasing device I, the transfer positioning device II, the power separating device I, the torque increasing device II, the transfer positioning device III and the power separating device II are sequentially sleeved on the transmission shaft I, the torque increasing device III is sleeved at the left end of the transmission shaft II, and the right end of the transmission shaft II penetrates through the upper shell to extend into the lower shell and is connected with the torque axial reverse assembly.
Further technical scheme is, uninstallation coupling assembling I includes sleeve, tapered roller bearing I, sealing ring, tapered roller bearing II, the tip interference fit of casing on the inner circle of tapered roller bearing I, tapered roller bearing II is even, the outer lane cooperates with the inner wall of casing down, uninstallation coupling assembling II's structure and principle are the same with uninstallation coupling assembling I.
The torque axial direction reversing component comprises a bevel gear I connected with a transmission shaft II, a bevel gear II rotationally connected to the inner wall of the lower shell and a bevel gear III connected with the lower connector, and the bevel gear I and the bevel gear III are in meshing transmission with the bevel gear II.
The further technical scheme is that the transfer positioning device II comprises a shell and two tapered roller bearings III arranged in the shell, and a positioning screw rod in threaded connection with the shell is arranged on the upper shell.
The further technical scheme is that the number of the positioning screws is three, and the positioning screws are uniformly distributed on the outer circular surface of the shell.
The further technical scheme is that two ends of the shell are provided with sealing rings.
The further technical scheme is that the power input device is a power input sleeve.
The torque increasing device III comprises an input shell and an output shell, wherein a liquid guide wheel is arranged between the input shell and the output shell, the inner walls of the input shell and the output shell are respectively provided with a liquid dispersing wheel and a liquid driving wheel, and the input shell and the output shell are filled with driving liquid.
The well friction drag reduction method adopting the well friction drag reduction tool specifically comprises the following steps:
s1, sequentially connecting a drill bit, a screw drilling tool, a measurement while drilling tool, a non-magnetic drill collar, a downhole friction-reducing and resistance-reducing tool and a drill rod and putting the drill bit, the screw drilling tool, the measurement while drilling tool, the non-magnetic drill collar, the downhole friction-reducing and resistance-reducing tool and the drill rod into a well;
s2, starting a rotary table or a top drive to rotate a drill column, transmitting torque to an upper shell of the underground friction-reducing and resistance-reducing tool by the ground drill column, inputting the torque to a power input device by the upper shell, driving the normal operation of a torque increasing device I by the power input device, and finally transmitting the torque to a lower joint after the torque is strengthened by a torque increasing device II to drive a screw drill and a drill bit to normally drill;
s3, when the sliding guide drilling working condition needs to be kept, the rotating speed of the drill string is adjusted to be lower than 35rpm, the torque of the lower drill string is reduced, the torque increasing device III is not enough to overcome the reactive torque from the drill bit and other downhole tools, and the torque increasing device III keeps relatively static, so that the sliding guide drilling under the rotating state of the drill string is realized;
and S4, when the rotary drilling working condition needs to be kept, adjusting the rotating speed of the drill string to be more than 65rpm, and increasing the torque of the lower drill string, so that the torque increasing device III can overcome the reactive torque from the drill bit and other downhole tools, and the torque of the torque increasing device III is finally output to a subsequent drilling tool after being reversed by the torque axial reversing assembly.
The invention has the following beneficial effects: the invention realizes the rotary directional drilling of the drill stem by directly controlling the separation of the tool to the torque by the well head staff, can replace a rotary directional drilling system, but has lower cost and forms a new high-efficiency drilling technology with low cost, thereby solving the technical problems of complex structure well drilling, such as high friction resistance of the drill stem, serious pressure supporting, low mechanical drilling speed, difficult ultimate extension capability and the like; and static friction resistance can be eliminated fundamentally, the drilling efficiency is further improved, and the cost is reduced.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of the upper housing;
FIG. 3 is a schematic view of a lower header structure;
FIG. 4 is a schematic structural diagram of a torque increasing device;
FIG. 5 is a schematic structural diagram of an input housing;
FIG. 6 is a schematic structural view of an output housing;
FIG. 7 is a schematic diagram of an explosive structure of the moment-increasing device;
fig. 8 is a schematic view of the installation of the present invention.
Shown in the figure: 1-drilling fluid return pipe, 2-upper shell, 3-lower joint, 4-transfer positioning device I, 5-positioning screw rod, 6-power input device, 7-torque increasing device I, 8-transfer positioning device II, 9-power separation device I, 10-torque increasing device II, 11-transfer positioning device III, 12-power separation device II, 13-torque increasing device III, 14-unloading connecting component I, 15-lower shell, 16-torque axial reversing component, 17-unloading connecting component II, 201-output shell, 202-liquid guide wheel and 203-input shell.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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.
As shown in fig. 1, fig. 2 and fig. 3, the downhole friction-reducing and drag-reducing tool of the present invention comprises an upper casing 2, a lower casing 15, a lower joint 3 and a drilling fluid return pipe 1 axially arranged in the upper casing 2, the lower casing 15 and the lower joint 3;
an unloading connecting assembly I14, a torque axial reversing assembly 16 and an unloading connecting assembly II 17 are sequentially arranged in the lower shell 15; one end of the lower joint 3 is arranged in the unloading connecting assembly II 17 and is connected with the torque axial reversing assembly 16, and one end of the upper shell 2 is arranged in the unloading connecting assembly I14;
a transfer positioning device I4, a power input device 6, a torque increasing device I7, a transfer positioning device II 8, a power separation device I9, a torque increasing device II 10, a transfer positioning device III 11, a power separation device II 12, a torque increasing device III 13, a transmission shaft I and a transmission shaft II which are sleeved on the drilling fluid return pipe 1 are sequentially arranged in the upper shell 2; the outer circular surface of the power input device 6 is connected with the inner wall of the upper shell 2 through a wedge key, the torque increasing device I7 is connected with one side of the power input device 6, the torque increasing device II 10 is connected with one side of the power separation device I9, the torque increasing device III 13 is connected with one side of the power separation device II 12, the transfer positioning device I4, the power input device 6, the torque increasing device I7, the transfer positioning device II 8, the power separation device I9, the torque increasing device II 10, the transfer positioning device III 11 and the power separation device II 12 are sequentially sleeved on the transmission shaft I, the torque increasing device III 13 is sleeved at the left end of the transmission shaft II, and the right end of the transmission shaft II penetrates through the upper shell 2 to extend into the lower shell 15 and is connected with the torque axial direction reversing component 16.
The lower end of a transfer positioning device I4 is directly contacted with a power input device 6, 4 wedge keys with 90-degree circumferential intervals are arranged on the periphery of the power input device 6, an upper shell 2 and the transfer positioning device I4 synchronously rotate, 4 threaded holes are circumferentially arranged on the right side of the power input device 6, 4 extending installation lifting lugs are arranged at the input end of a torque increasing device I7, the 4 installation lifting lugs are connected with the power input device 6 through screws, so that the torque increasing device I7 and the upper shell 2 synchronously rotate to further drive a transmission shaft I to rotate, then torque is increased on the transmission shaft I through a torque increasing device II 10, finally the transmission shaft I drives a power separation device II 12 to rotate, and further the power separation device II 12 drives a torque increasing device III to rotate; the torque increasing device III 13 drives the transmission shaft II to rotate, the transmission shaft II transmits the torque to the torque axial reversing assembly 16, and the torque is finally output to the lower joint 3 after the torque is reversed by the torque axial reversing assembly 16.
The tail end of the lower part of the upper shell is in a shaft shoulder shape, a sealing ring and two reverse tapered roller bearing inner rings are mounted on the shaft shoulder, the reverse mounting aims to reduce extrusion force as much as possible, the two tapered roller bearing outer rings are matched with the lower end shell, and the arrangement aims to ensure that the upper end and the lower end can independently rotate.
In this embodiment, as shown in fig. 1 and fig. 2, the specific structure of the unloading connection assembly i 14 includes a sleeve, a tapered roller bearing i, a sealing retainer ring, and a tapered roller bearing ii, inner rings of the tapered roller bearing i and the tapered roller bearing ii are in interference fit with an end of the upper housing 2, an outer ring is in fit with an inner wall of the lower housing 15, a lower end of the upper housing 2 forms a shoulder shape, the sleeve, the tapered roller bearing i, the sealing retainer ring, and the tapered roller bearing ii are sequentially mounted on the shoulder, the tapered roller bearing i and the tapered roller bearing ii are reversely mounted, the reverse mounting is performed for reducing the extrusion force, and outer rings of the two tapered roller bearings are fitted with the inner wall of the lower housing 15, so as to ensure that the upper housing 2 and the lower housing 15 can independently rotate.
As shown in fig. 1 and 3, the structure and principle of the unloading connecting assembly ii 17 are the same as those of the unloading connecting assembly i 14, and the upper end of the lower joint 3 is also in a shoulder shape, so as to ensure that the lower joint 3 and the lower housing 15 can rotate independently.
In this embodiment, as shown in fig. 1, the torque axial direction reversing component 16 includes a bevel gear i connected to a transmission shaft ii, a bevel gear ii rotatably connected to the inner wall of the lower housing 15, and a bevel gear iii connected to the lower joint 3, where the bevel gear i and the bevel gear iii are both in meshing transmission with the bevel gear ii, that is, the transmission shaft ii drives the bevel gear i to rotate, the bevel gear i drives the bevel gear ii to rotate, the bevel gear ii drives the bevel gear iii to rotate, and finally the bevel gear iii drives the lower joint 3 to rotate, so as to achieve torque transmission. The included angle between three bevel gears is 90 degrees.
As shown in fig. 1, the transfer positioning device i 4 comprises a housing and two tapered roller bearings iii mounted in the housing, the upper housing 2 is provided with three positioning screws 5 in threaded connection with the housing, the circumferential intervals of the three positioning screws 5 are 120 degrees respectively, and the three positioning screws are used for positioning and mounting the transfer positioning device. And sealing rings are arranged at two ends of the transfer positioning device and used for isolating each cavity. The structure and the principle of the transfer positioning device II 8 and the transfer positioning device III 11 are the same as those of the transfer positioning device I4.
In the present embodiment, the power input device 6 is a power input sleeve.
As shown in fig. 1, 4, 5, 6, and 7, in the present embodiment, the torque increasing device iii 13 includes an input housing 203 and an output housing 201, a liquid guide wheel 202 is disposed between the input housing 203 and the output housing 201, a divergent liquid wheel and a liquid driving wheel are disposed on inner walls of the input housing 203 and the output housing 201, respectively, and the input housing 203 and the output housing 201 are filled with a driving liquid. The structure and the principle of the moment-increasing device I7 and the moment-increasing device II 10 are the same as those of the moment-increasing device III 13.
Three wheels, each wheel having a plurality of blades; the divergent liquid wheel is used as the power input of the whole torque increasing device and is mainly responsible for throwing up the liquid in the device, and the liquid driving wheel is directly connected with the transmission shaft; in a torque increasing device, the divergent liquid wheel is a driving wheel, the liquid driving wheel is a driven wheel, and the radian of blades of the liquid driving wheel is much larger than that of the blades of the divergent liquid wheel; the liquid guide wheel is clamped between the divergent liquid wheel and the liquid driving wheel and is used for guiding the liquid in the device; when power is input to the divergent liquid wheel, the divergent liquid wheel starts to rotate, liquid is thrown onto the inner wall of the moment-increasing device by the divergent liquid wheel under the action of centrifugal force, the inner wall of the moment-increasing device is similar to an ellipsoid, and when the liquid is thrown onto the inner wall of the divergent liquid wheel side by the divergent liquid wheel, the liquid reaches the liquid driving wheel on the other side along the inner wall; because the liquid driving wheel blade has a large radian, when liquid flows into the liquid driving wheel, the liquid can impact the liquid driving wheel blade so as to drive the liquid driving wheel to rotate; because of the radian of the liquid driving wheel, after the liquid flows through the liquid driving wheel, the flowing direction of the liquid is opposite to the rotating direction of the liquid dispersing wheel, in order to avoid energy loss, and in order to increase the torque, the liquid guide wheel is arranged between the liquid driving wheel and the liquid dispersing wheel, the blade of the liquid guide wheel is thicker than the other two wheels, the blade of the liquid guide wheel has a radian at the side impacted by the liquid, when the liquid impacts the liquid guide wheel, the liquid can change along the radian in the direction, so that the direction of the liquid is consistent with the direction of the liquid dispersing wheel, and after the liquid impacts the liquid guide wheel, similar to a faucet holding a pipe orifice by hand, the flow rate of the liquid at this time can be fast, the liquid after the fast flow rate can impact the liquid dispersing wheel, so as to increase the torque of the liquid dispersing wheel, and the liquid is thrown onto the inner wall by the liquid dispersing wheel, the liquid thus circulates continuously in the torque increasing device.
The well friction drag reduction method adopting the well friction drag reduction tool specifically comprises the following steps:
s1, as shown in figure 8, sequentially connecting a drill bit, a screw drill, a measurement while drilling tool, a non-magnetic drill collar, a downhole friction-reducing and drag-reducing tool and a drill rod and putting the drill rod into the well;
s2, starting a rotary table or a top drive to rotate a drill string, transmitting torque to an upper shell 2 of the underground friction-reducing and resistance-reducing tool by the ground drill string, inputting the torque to a power input device 6 by the upper shell 2, driving the power input device 6 to drive a torque increasing device I7 to normally operate, reinforcing the torque by a torque increasing device II 10, and finally transmitting the torque to a lower connector 3 to drive a screw drill and a drill bit to normally drill;
s3, when the sliding guide drilling working condition needs to be kept, the rotating speed of the drill string is adjusted to be lower than 35rpm, the torque of the lower drill string is reduced, the torque increasing device III 13 is not enough to overcome the reactive torque from the drill bit and other downhole tools, and the torque increasing device III 13 keeps relatively static, so that the sliding guide drilling under the rotating state of the drill string is realized;
and S4, when the rotary drilling condition needs to be kept, adjusting the rotating speed of the drill string to be more than 65rpm, and increasing the torque of the lower drill string, so that the torque increasing device III 13 can overcome the reactive torque from the drill bit and other downhole tools, and the torque of the torque increasing device III 13 is finally output to a subsequent drilling tool after being reversed by the torque axial reversing assembly 16.
The method prevents the screw drill from being held back and overhigh torque in the bottom hole drill assembly through the torque of the downhole friction resistance reducing tool, ensures the effective transmission of the drilling pressure, slows down poor drilling and slippery drilling, and reduces the abrasion of the drill, the screw and the drill bit.
Although the present invention has been described with reference to the above embodiments, it should be understood that the present invention is not limited to the above embodiments, and those skilled in the art can make various changes and modifications without departing from the scope of the present invention.
Claims (7)
1. The downhole friction-reducing and resistance-reducing tool based on mechanical decoupling is characterized by comprising an upper shell (2), a lower shell (15), a lower joint (3) and a drilling fluid return pipe (1) axially arranged in the upper shell (2), the lower shell (15) and the lower joint (3);
an unloading connecting assembly I (14), a torque axial reversing assembly (16) and an unloading connecting assembly II (17) are sequentially arranged in the lower shell (15); one end of the lower joint (3) is installed in the unloading connecting assembly II (17) and connected with the torque axial reversing assembly (16), and one end of the upper shell (2) is installed in the unloading connecting assembly I (14);
a transfer positioning device I (4), a power input device (6), a torque increasing device I (7), a transfer positioning device II (8), a power separation device I (9), a torque increasing device II (10), a transfer positioning device III (11), a power separation device II (12), a torque increasing device III (13), a transmission shaft I and a transmission shaft II which are sleeved on the drilling fluid return pipe (1) are sequentially arranged in the upper shell (2); the outer circular surface of the power input device (6) is connected with the inner wall of the upper shell (2) through a wedge key, the moment increasing device I (7) is connected with one side of the power input device (6), the moment increasing device II (10) is connected with one side of the power separation device I (9), the moment increasing device III (13) is connected with one side of the power separating device II (12), the transfer positioning device I (4), the power input device (6), the torque increasing device I (7), the transfer positioning device II (8), the power separation device I (9), the torque increasing device II (10), the transfer positioning device III (11) and the power separation device II (12) are sequentially sleeved on the transmission shaft I, the torque increasing device III (13) is sleeved at the left end of the transmission shaft II, the right end of a transmission shaft II penetrates through the upper shell (2) to extend into the lower shell (15) and is connected with a torque axial reversing assembly (16);
the unloading connecting assembly I (14) comprises a sleeve, a tapered roller bearing I, a sealing retainer ring and a tapered roller bearing II, inner rings of the tapered roller bearing I and the tapered roller bearing II are in interference fit with the end part of the upper shell (2), outer rings of the tapered roller bearing I and the tapered roller bearing II are matched with the inner wall of the lower shell (15), and the structure and the principle of the unloading connecting assembly II (17) are the same as those of the unloading connecting assembly I (14);
the torque axial reversing assembly (16) comprises a bevel gear I connected with a transmission shaft II, a bevel gear II rotationally connected to the inner wall of the lower shell (15) and a bevel gear III connected with the lower connector (3), and the bevel gear I and the bevel gear III are in meshing transmission with the bevel gear II.
2. The tool for reducing friction and drag based on mechanical decoupling as claimed in claim 1, wherein said transfer positioning device i (4) comprises a housing and two tapered roller bearings iii mounted in the housing, and said upper housing (2) is provided with a positioning screw (5) screwed on said housing.
3. The tool for reducing friction and drag based on mechanical decoupling as claimed in claim 2, wherein the number of the positioning screws (5) is three, and the positioning screws are uniformly distributed on the outer circular surface of the casing.
4. The mechanical decoupling based downhole friction and drag reducing tool of claim 2, wherein both ends of the housing are provided with a sealing ring.
5. A downhole friction reducing and drag reducing tool based on mechanical decoupling according to claim 1, wherein the power input device (6) is a power input sleeve.
6. The mechanical decoupling based downhole friction and drag reducing tool is characterized in that the moment increasing device III (13) comprises an input shell (203) and an output shell (201), a liquid guide wheel (202) is arranged between the input shell (203) and the output shell (201), the inner walls of the input shell (203) and the output shell (201) are respectively provided with a liquid dispersing wheel and a liquid driving wheel, and the input shell (203) and the output shell (201) are filled with driving liquid.
7. A method of well bore friction drag reduction by a well bore friction drag reducing tool according to any of claims 1 to 6, comprising the steps of:
s1, sequentially connecting a drill bit, a screw drilling tool, a measurement while drilling tool, a non-magnetic drill collar, a downhole friction-reducing and resistance-reducing tool and a drill rod and putting the drill bit, the screw drilling tool, the measurement while drilling tool, the non-magnetic drill collar, the downhole friction-reducing and resistance-reducing tool and the drill rod into a well;
s2, starting a rotary table or a top drive to rotate a drill string, transmitting torque to an upper shell (2) of the underground friction-reducing and drag-reducing tool by the ground drill string, inputting the torque to a power input device (6) by the upper shell (2), driving the normal operation of a torque increasing device I (7) by the power input device (6), then reinforcing the torque by a torque increasing device II (10), and finally transmitting the torque to a lower joint (3) to drive a screw drilling tool and a drill bit to normally drill;
s3, when the sliding guide drilling working condition needs to be kept, the rotating speed of the drill string is adjusted to be lower than 35rpm, the torque of the lower drill string is reduced, so that the torque increasing device III (13) is not enough to overcome the reactive torque from the drill bit and other downhole tools, and the torque increasing device III (13) keeps relatively static, and the sliding guide drilling under the rotating state of the drill string is realized;
and S4, when the rotary drilling condition needs to be maintained, the rotating speed of the drill string is adjusted to be more than 65rpm, the lower drill string torque is increased, so that the torque increasing device III (13) can overcome the reactive torque from the drill bit and other downhole tools, and the torque of the torque increasing device III (13) is finally output to a subsequent drilling tool after being reversed by the torque axial reversing assembly (16).
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| CN202210235725.3A CN114293913B (en) | 2022-03-11 | 2022-03-11 | Downhole friction-reducing and resistance-reducing tool and method based on mechanical decoupling |
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| CN115977534B (en) * | 2023-03-22 | 2023-05-16 | 西南石油大学 | Horizontal well friction-reducing and drag-reducing hydraulic clutch drilling tool and method |
| CN116771298B (en) * | 2023-08-17 | 2023-10-24 | 西南石油大学 | Hydraulic control synchronous telescopic torque-variable type oil-gas well casing shaping tool |
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