CN117449753A - Screw drilling tool with variable torque structure - Google Patents

Abstract

The invention discloses a screw drilling tool with a variable torque structure, which specifically comprises: the invention relates to the technical field of screw drilling tools, in particular to a screw drilling tool, which comprises a sleeve, wherein a screw device is rotatably arranged at an inner cavity of the sleeve, a pressing sheet is fixedly connected to an output end of the sleeve, the pressing sheet is positioned on one side far away from a tightening device, an extension device is movably sleeved on the outer surface of the sleeve, and a tightening device is movably sleeved on the outer surface of the extension device. This screw drilling tool with variable torque structure, through drilling rod and dog-ear center department and then contact, dog-ear is twisted the extrusion and is kept away from the one side swing of dog-ear, dog-ear is extruded and is promoted soil in the outside, prevents to creep into excessively and cracked condition, and the bed course is creep into the extrusion by the drilling rod and promotes the guide arm operation moreover, and the guide arm forms the trend of screens, and the torsional effect takes place for the guide arm, and then prevents to appear the uptake of more dust when guaranteeing equipment motion displacement, realizes the purpose of automatic management soil, promotes the facility of boring.

Description

Screw drilling tool with variable torque structure

Technical Field

The invention relates to the technical field of screw drilling tools, in particular to a screw drilling tool with a variable torque structure.

Background

In the development of oil and gas field drilling, the rotary motion of the drill bit is required to destroy the stratum to form a passage from the ground to the target reservoir, the rotary motion of the drill bit is usually transmitted through the drill rod, the rigidity of the whole drill string is reduced along with the increase of the drilling depth, buckling and instability are easy to occur when the drill string is subjected to the action of torque and weight on bit, particularly in the drilling of a directional well and a horizontal well, the drill rod is contacted with the well wall, so that the friction force between the drill string and the well wall is increased, the greater weight on bit is required to overcome the friction force between the drill string and the well wall, the instability is easy to occur to the drill string, the drilling efficiency is low, and the track of the well hole is poor, so that a downhole tool is urgently needed to reduce the torque born by the drill string.

According to CN202211118044.5 disclosed in Chinese patent number, a torque self-balancing nested double-bit is driven by an underground double motor to reversely rotate by an inner bit and an outer bit, so that the torque balance of the inner bit and the outer bit is realized, a cable is required to be put into the bottom of a well, and the equipment process is complex; on the other hand, the motor is difficult to adapt to the high-temperature environment of deep wells and ultra-deep wells, and the application range of the motor is limited.

In summary, the above-mentioned prior art has the disadvantage that, although the drill string torque can be reduced greatly from the source, it is difficult to adjust and change the torque structure, so that more dust and soil adhere to the outside of the torque, and the purpose of rapid operation is achieved.

Disclosure of Invention

Aiming at the defects of the prior art, the invention solves the technical problems by adopting the following technical scheme:

a progressive cavity drilling tool having a variable torque structure, comprising:

the device comprises a sleeve, wherein a screw device is rotatably arranged at the inner cavity of the sleeve and used for adjusting the torque state of drilling, a pressing sheet is fixedly connected to the output end of the sleeve and is positioned at one side far away from a tightening device, an extension device is movably sleeved on the outer surface of the sleeve and used for adjusting the length distance, a tightening device is movably sleeved on the outer surface of the extension device and used for adjusting the stability of the drill bit during recovery and placement;

the screw rod device includes the drilling rod, and the drilling rod drill bit extrudees gradually and rolls over a piece, rolls over a piece and takes place deformation and displacement, rolls over a piece and extrudees the folding in bed course department with the medium plate, one side fixed mounting that the preforming was kept away from to the drilling rod has the dead lever, fixedly connected with pole axle in the middle of one side that the dead lever kept away from the drilling rod, the drilling rod surface activity has cup jointed a piece of rolling over, a side movable mounting that rolls over the piece and is close to the preforming has the medium plate, medium plate top fixedly connected with bed course, bed course surface movable mounting has central device.

Further, the centre of a circle of folding piece and bed course is on same straight line, the middle part at pilot test device is installed in the bed course embedding, the bed course is ring shape structure, the central line that the medium plate was used to the folding piece is referenced and evenly distributed, the diameter of dead lever is bigger than the diameter of dead lever axle, the centre at the dead lever is installed in the embedding of dead lever, pilot test device still includes the ring body, ring body internal surface fixed mounting has the settling block, the one end that the settling block is close to the ring body centre of a circle activity peg graft has the folding strip, and the folding strip blocks in auxiliary strip department, and the auxiliary strip is spacing to the removal distance of outside four directions, prevents to bore excessively and the cracked condition, and the bed course is bored by the drilling rod and is extruded and promote the guide arm operation in addition, one side fixed mounting that the settling block kept away from the bed course has the guide arm, the guide arm surface activity cup joints the lantern ring piece, lantern ring piece surface fixed mounting has the auxiliary strip, the coating has the viscose between ring body and the settling block, the lantern ring piece activity guide arm is at the surface of guide arm, the middle part of penetrating the lantern ring piece, the middle part, the contained angle between settling block and the guide arm is ten degrees, the centre of a circle of a whole is evenly distributed for reference, four.

Further, the stretching device comprises a main barrel plate, an inner barrel plate is movably sleeved on the inner surface of the main barrel plate, a guide rod is movably mounted between the inner barrel plate and the main barrel plate, a ring is fixedly mounted at one end of the rod shaft, which is far away from the inner barrel plate, and is gradually displaced, the ring slides along the center of the extending block, the extending block forms a torsion trend, the extending block impacts the inner barrel plate to move, the outer surface of the rod shaft is fixedly connected with a middle sheet, a throwing strip is fixedly mounted on the outer surface of the middle sheet, an arc strip is movably mounted at the side edge of the throwing strip, a comb sheet is movably inserted at one end of the arc strip, which is far away from the ring, an extending block is fixedly mounted on the outer surface of the throwing strip, the center of the extending block and the center of the ring are on the same straight line, the diameter of the ring is larger than that of the extending block, and the extending block is made of stainless steel.

Further, the tightening device comprises a chuck, a ring is fixedly arranged on the inner surface of the chuck, a bolt is movably inserted at the side edge of the ring, a clamping ring is movably arranged at the inner cavity of the bolt, a pressing block is fixedly arranged on the inner surface of the bolt, a supporting strip is fixedly arranged at the top of the pressing block, the matching ring is displaced to the supporting strip, the supporting strip is extruded to the matching ring, the supporting strip pushes the pressing block to displace, and the pressing block is embedded into the bolt.

The invention provides a screw drilling tool with a variable torque structure. The beneficial effects are as follows:

1. the screw drilling tool with the variable torque structure is connected with the output end of the motor through one end of the rod shaft, the rod shaft rotates anticlockwise when electrified, the linkage fixed rod and the drill rod synchronously move, and therefore the equipment is guaranteed to have the basic condition of quick drilling, and the purpose of quick adjustment is achieved.

2. This screw rod drilling tool with variable torque structure runs through the inside of rolling over the piece through the drilling rod to extend to the medium plate middle part, the drilling rod drill bit is crowded gradually and is rolled over the piece, rolls over the piece and extrudees folding in cushion department with the medium plate, and the cushion is adjusted the travel distance of medium plate, and the rotation moment of torsion of drilling rod has been weakened in the blockking of medium plate, has adjusted the travel speed of drilling rod, and the cushion is simply blockked the dust in the outside when boring simultaneously, does not influence the development of boring into at the middle part simultaneously, and then promotes the variable torque adjustment of drilling tool, reduces the cost of boring into and using.

3. This screw rod drilling tool with variable torque structure, through drilling rod and dog-ear center department and then contact, dog-ear is twisted the extrusion and is in the one side swing of keeping away from the dog-ear, dog-ear is extruded and is in outside promotion soil, dog-ear stops in auxiliary strip department, auxiliary strip is spacing to the removal distance of outside four directions, prevent to bore excessively and cracked condition, the bed course is bored by the drilling rod and is extruded and promote the guide arm operation moreover, the guide arm forms the trend of screens, the guide arm takes place torsional effect, and then prevent to appear the uptake of more dust when guaranteeing equipment motion displacement, realize the purpose of automatic management soil, promote the facility of boring.

4. This screw drilling tool with variable torque structure, through the piece in the pole shaft surface fixedly connected with, the piece simultaneous movement in the pole shaft linkage, the well piece is through getting rid of the strip and the synchronous motion of action arc strip, and the comb piece is along with the rotation of arc strip and the motion, and the comb piece is rotatory to produce wind-force, and the wind-force that the comb piece produced is handled inside gradually, promotes the inside heat dissipation degree, prevents that the overload condition from appearing in the too high temperature, realizes the purpose of rapid tooling.

5. This screw drilling tool with variable torque structure through joining in marriage the ring and take place the displacement gradually, joins in marriage the ring and slide along the center department of stretching the piece, stretches the piece and forms the trend of torsion, stretches piece striking inner tube board and moves, and inner tube board slides the displacement along the guide bar surface, and the guide bar is located between main tube board and the inner tube board, and finally the inner tube board slides to the bottommost from the inner chamber department of main tube board, and then forms the trend of torsion, guarantees the protectiveness that equipment sleeve surface had.

6. This screw drilling tool with variable torque structure joins in marriage the ring and synchronous motion through the drilling rod extrusion, joins in marriage the ring displacement to branch strip department, and branch strip forms the extrusion of joining in marriage the ring to the branch strip, and branch strip promotes briquetting and displacement, and briquetting embeds to the inside of bolt, and the bolt is convenient for consolidate the snap ring, and then guarantees that equipment has the effect of rapid protection joining in marriage ring and drilling rod, prevents in step that the situation of rocking from appearing, the stability performance of lifting means.

Drawings

FIG. 1 is a schematic perspective view of the whole structure of the present invention;

FIG. 2 is a schematic perspective view of a chuck according to the present invention;

FIG. 3 is a schematic perspective view of the ring of the present invention;

FIG. 4 is a schematic perspective view of a latch according to the present invention;

FIG. 5 is a schematic perspective view of the structure of the protrusion of the present invention;

FIG. 6 is a schematic perspective view of the ring structure of the present invention;

FIG. 7 is a schematic perspective view of the drill rod of the present invention;

FIG. 8 is a schematic perspective view of a folder according to the present invention;

FIG. 9 is a schematic perspective view of a plate according to the present invention;

fig. 10 is an enlarged view of a portion of the collar member of fig. 9 at a.

In the figure: 1. a sleeve; 2. tabletting; 3. an extension device; 4. a tightening device; 5. a screw device; 41. a chuck; 42. a loop; 43. a bolt strip; 44. a clasp; 45. briquetting; 46. a supporting strip; 31. a main barrel plate; 32. an inner cylinder plate; 33. a guide rod; 34. matching a ring; 35. extending blocks; 36. throwing the strip; 37. an arc bar; 38. carding; 39. middle piece; 51. a drill rod; 52. a fixed rod; 53. a lever shaft; 54. a folding piece; 55. a middle plate; 56. a central device; 57. a cushion layer; 561. a ring body; 562. a placement block; 563. a guide rod; 564. a collar member; 565. folding strips; 566. assisting the strip.

Detailed Description

The invention will be described in further detail with reference to the drawings and the detailed description. The examples of the present invention are presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.

Example 1: referring to fig. 1 and fig. 5-10, the present invention provides a technical solution: a progressive cavity drilling tool having a variable torque structure, comprising:

the device comprises a sleeve 1, wherein a screw device 5 is rotatably arranged at the inner cavity of the sleeve 1, and the screw device 5 is used for adjusting the torque state of drilling;

the screw device 5 comprises a drill rod 51, a drill rod 51 bit is gradually extruded to form a folding piece 54, the folding piece 54 deforms to displace, the folding piece 54 is used for extruding and folding a middle plate 55 at a cushion layer 57, a fixed rod 52 is fixedly arranged on one side, far away from the pressing sheet 2, of the drill rod 51, a rod shaft 53 is fixedly connected with the middle of one side, far away from the drill rod 51, of the fixed rod 52, the folding piece 54 is movably sleeved on the outer surface of the drill rod 51, the middle plate 55 is movably arranged on one side, close to the pressing sheet 2, of the folding piece 54, the top end of the middle plate 55 is fixedly connected with the cushion layer 57, and a center device 56 is movably arranged on the outer surface of the cushion layer 57.

The center of the folding piece 54 and the center of the cushion 57 are on the same straight line, the cushion 57 is embedded and installed in the middle of the central device 56, the cushion 57 is of a circular ring-shaped structure, the middle plate 55 is uniformly distributed by taking the center line of the folding piece 54 as a reference, the diameter of the fixed rod 52 is larger than that of the rod shaft 53, the rod shaft 53 is embedded and installed in the middle of the fixed rod 52, the central device 56 also comprises a ring body 561, the inner surface of the ring body 561 is fixedly provided with a placement block 562, one end of the placement block 562 close to the center of the ring body 561 is movably inserted with a folding strip 565, the folding strip 565 is blocked at an auxiliary strip 566, the auxiliary strip 566 limits the moving distance of the folding strip 565 in the four directions on the outer side, the situation that excessive drilling and breakage occur is prevented, the cushion 57 is drilled and extruded by the drill rod 51 to push the guide rod 563 to operate, the guide rod 563 is fixedly arranged on one side, far away from the cushion 57, of the placement block 562, the sleeve ring piece 564 is movably sleeved on the outer surface of the guide rod 563, the auxiliary strips 566 are fixedly arranged on the outer surface of the sleeve ring piece 564, adhesive is coated between the ring body 561 and the placement block 562, the sleeve ring piece 564 is movably sleeved on the outer surface of the guide rod 563, the guide rod 563 penetrates through the middle part of the sleeve ring piece 564, an included angle between the placement block 562 and the guide rod 563 is ninety degrees, the guide rod 563 is uniformly distributed by taking the center of the ring body 561 as a reference, and the total number of the auxiliary strips 566 is four.

When the device is used, firstly, the installation and fixation of the device are checked, one end of the rod shaft 53 is connected with the output end of the motor, the rod shaft 53 rotates anticlockwise when energized, the rod shaft 53 rotates to link the fixed rod 52 and the drill rod 51 to synchronously move, so that the device is ensured to have the basic condition of quick drilling, and the purpose of quick adjustment is realized.

When the oil and gas field well drilling development and other treatments are needed, the drill rod 51 is aligned to the soil, the drill rod 51 is influenced by the rod shaft 53 to rotate rapidly, the drill rod 51 is twisted rapidly along the reverse texture inside the sleeve 1, the drill rod 51 penetrates through the folded piece 54 and extends to the middle part of the middle plate 55, the drill rod 51 bit gradually presses the folded piece 54, the folded piece 54 deforms to displace, the folded piece 54 presses and folds the middle plate 55 at the cushion layer 57, the cushion layer 57 adjusts the moving distance of the middle plate 55, the blocking of the middle plate 55 weakens the rotating torque of the drill rod 51, the moving speed of the drill rod 51 is adjusted, meanwhile, the cushion layer 57 simply blocks dust on the outer side during drilling, drilling development in the middle part is not influenced, and therefore variable torque adjustment of a drilling tool is improved, and the cost used for drilling is reduced.

When the drilling treatment is performed, the outside soil dust and the outside of the erosion drilling rod 51 are excessively accumulated to influence the drilling, and even the stagnation condition can occur seriously, so when the middle plate 55 is extruded downwards, the drilling rod 51 continuously moves towards the middle part of the folded piece 54 and moves to penetrate through the inside of the cushion 57, the drilling rod 51 is in contact with the center of the folded strip 565, the folded strip 565 is twisted and extruded to swing towards one side far away from the folded piece 54, the folded strip 565 is extruded to push the soil outwards, the folded strip 565 is blocked at the auxiliary strip 566, the auxiliary strip 566 limits the moving distance of the folded strip 565 in the four directions on the outside, the situation of excessive drilling and breakage is prevented, the cushion 57 is drilled and extruded by the drilling rod 51 to push the guide rod 563 to operate, the guide rod 563 forms a clamping trend, the guide rod 563 has twisting effect, the aim of preventing more dust from being absorbed when equipment moves and shifts is further ensured, the aim of automatically managing the soil is achieved, and the drilling convenience is improved.

Example 2: referring to fig. 1, 2 and 5-6, the present invention provides a technical solution: the output end of the sleeve 1 is fixedly connected with a pressing sheet 2, the pressing sheet 2 is positioned at one side far away from the tightening device 4, the outer surface of the sleeve 1 is movably sleeved with an extension device 3, and the extension device 3 is used for adjusting the length distance;

the stretching device 3 comprises a main barrel plate 31, an inner barrel plate 32 is movably sleeved on the inner surface of the main barrel plate 31, a guide rod 33 is movably installed between the inner barrel plate 32 and the main barrel plate 31, one end, far away from the inner barrel plate 32, of a rod shaft 53 is fixedly provided with a matching ring 34, the matching ring 34 gradually displaces, the matching ring 34 slides along the center of the matching ring 35, the matching ring 35 forms a torsion trend, the matching ring 35 impacts the inner barrel plate 32 to move, the outer surface of the rod shaft 53 is fixedly connected with a middle piece 39, a throwing strip 36 is fixedly installed on the outer surface of the middle piece 39, an arc strip 37 is movably installed on the side edge of the throwing strip 36, one end, far away from the matching ring 34, of the arc strip 37 is movably spliced with a comb piece 38, the outer surface of the throwing strip 36 is fixedly installed with the matching ring 35, the circle centers of the matching ring 34 are on the same straight line, the diameter of the matching ring 34 is larger than that of the matching ring 35, and the matching ring 35 is made of stainless steel.

When the device is used, the drilling is continued for a workpiece all the time, the overload condition is easy to occur due to the fact that the heat in the device is large, the service life of maintenance equipment is not facilitated, therefore, when the drill rod 51 needs to be protected, the middle plate 39 is fixedly connected to the outer surface of the rod shaft 53, the middle plate 39 moves synchronously in a linkage mode, the middle plate 39 moves synchronously through the swinging strips 36 and the arc strips 37, the comb plate 38 moves along with the rotation of the arc strips 37, wind force is generated by the rotation of the comb plate 38, the wind force generated by the comb plate 38 gradually treats the inside, the heat dissipation degree of the inside is improved, the overload condition caused by overhigh temperature is prevented, and the aim of rapid machining is fulfilled.

Since the sleeve 1 needs to be protected from external impact force and moves during drilling, the matching ring 34 is linked to move synchronously when the rod shaft 53 rotates and twists to displace, the matching ring 34 gradually displaces, the matching ring 34 slides along the center of the extending block 35, the extending block 35 forms a twisting trend, the extending block 35 impacts the inner barrel plate 32 to move, the inner barrel plate 32 slides along the outer surface of the guide rod 33 to displace, the guide rod 33 is positioned between the main barrel plate 31 and the inner barrel plate 32, and finally the inner barrel plate 32 slides to the bottommost part from the inner cavity of the main barrel plate 31, so that a twisting trend is formed, and the protectiveness of the outer surface of the equipment sleeve 1 is ensured.

Example 3: referring to fig. 1 to 10, the present invention provides a technical solution: on the basis of the embodiment 1, the outer surface of the stretching device 3 is movably sleeved with a tightening device 4, and the tightening device 4 is used for adjusting the stability of the drill bit during recovery and placement;

the tightening device 4 comprises a chuck 41, a ring 42 is fixedly arranged on the inner surface of the chuck 41, a bolt 43 is movably inserted at the side edge of the ring 42, a clamping ring 44 is movably arranged at the inner cavity of the bolt 43, a pressing block 45 is fixedly arranged on the inner surface of the bolt 43, a supporting strip 46 is fixedly arranged at the top of the pressing block 45, the matching ring 34 is displaced to the supporting strip 46, the supporting strip 46 forms extrusion of the matching ring 34, the supporting strip 46 pushes the pressing block 45 to displace, and the pressing block 45 is embedded into the bolt 43.

When equipment needs to be recovered and tidied, gaps are often easy to appear in the equipment, jolt occurs when the drill rod 51 is recovered, after the drill rod 51 is used, the direction is recovered to original displacement, the drill rod 51 extrudes the matching ring 34 to synchronously move, the matching ring 34 is displaced to the supporting strip 46, the supporting strip 46 forms extrusion of the matching ring 34, the supporting strip 46 pushes the pressing block 45 to displace, the pressing block 45 is embedded into the bolt 43, the bolt 43 is convenient for strengthening the clamping ring 44, the equipment is guaranteed to have the functions of quickly protecting the matching ring 34 and the drill rod 51, the shaking condition is synchronously prevented, and the stability of the equipment is improved.

It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art and which are included in the embodiments of the present invention without the inventive step, are intended to be within the scope of the present invention. Structures, devices and methods of operation not specifically described and illustrated herein are implemented by conventional means in the art unless specifically indicated and limited by the context.

Claims (9)

1. A progressive cavity drilling tool having a variable torque structure, comprising:

sleeve (1), sleeve (1) inner chamber department rotates installs screw rod device (5), and this screw rod device (5) are used for adjusting the moment of torsion state to boring, sleeve (1) output fixedly connected with preforming (2), and preforming (2) are located one side of keeping away from tightening means (4), its characterized in that: the outer surface of the sleeve (1) is movably sleeved with an extension device (3), the extension device (3) is used for adjusting the length distance, the outer surface of the extension device (3) is movably sleeved with a tightening device (4), and the tightening device (4) is used for adjusting the stability of the drill bit during recovery and placement;

screw rod device (5) are including drilling rod (51), one side fixed mounting that drilling rod (51) kept away from preforming (2) has solid pole (52), solid pole (52) are kept away from in the middle of one side of drilling rod (51) fixedly connected with pole shaft (53), folding piece (54) have been cup jointed in drilling rod (51) surface activity, folding piece (54) are close to one side movable mounting of preforming (2) have medium plate (55), medium plate (55) top fixedly connected with bed course (57), bed course (57) surface movable mounting has center device (56).

2. A progressive cavity drilling tool having a variable torque structure as defined in claim 1, wherein: the circle centers of the folded piece (54) and the cushion layer (57) are on the same straight line, the cushion layer (57) is embedded and arranged in the middle of the central device (56), and the cushion layer (57) is of a ring-shaped structure.

3. A progressive cavity drilling tool having a variable torque structure as defined in claim 1, wherein: the middle plates (55) are uniformly distributed by taking the center line of the folded piece (54) as a reference, the diameter of the fixed rod (52) is larger than that of the rod shaft (53), and the rod shaft (53) is embedded in the middle of the fixed rod (52).

4. A progressive cavity drilling tool having a variable torque structure as defined in claim 1, wherein: the pilot plant device (56) further comprises a ring body (561), wherein the inner surface of the ring body (561) is fixedly provided with a placement block (562), one end, close to the center of the ring body (561), of the placement block (562) is movably inserted with a folding strip (565), one side, far away from the cushion layer (57), of the placement block (562) is fixedly provided with a guide rod (563), the outer surface of the guide rod (563) is movably sleeved with a sleeve ring piece (564), and the outer surface of the sleeve ring piece (564) is fixedly provided with an auxiliary strip (566).

5. The progressive cavity drilling tool having a variable torque structure of claim 4, wherein: glue is coated between the ring body (561) and the placement block (562), the sleeve ring piece (564) is movably sleeved on the outer surface of the guide rod (563), and the guide rod (563) penetrates through the middle of the sleeve ring piece (564).

6. The progressive cavity drilling tool having a variable torque structure of claim 4, wherein: the included angle between the placement block (562) and the guide rod (563) is ninety degrees, the guide rod (563) is uniformly distributed by taking the center of the ring body (561) as a reference, and the number of the auxiliary strips (566) is four in total.

7. A progressive cavity drilling tool having a variable torque structure as defined in claim 1, wherein: the stretching device (3) comprises a main barrel plate (31), an inner barrel plate (32) is movably sleeved on the inner surface of the main barrel plate (31), a guide rod (33) is movably installed between the inner barrel plate (32) and the main barrel plate (31), a matching ring (34) is fixedly installed at one end of a rod shaft (53) far away from the inner barrel plate (32), a middle sheet (39) is fixedly connected with the outer surface of the rod shaft (53), a throwing strip (36) is fixedly installed on the outer surface of the middle sheet (39), an arc strip (37) is movably installed at the side edge of the throwing strip (36), a comb sheet (38) is movably spliced at one end of the arc strip (37) far away from the matching ring (34), and a stretching block (35) is fixedly installed on the outer surface of the throwing strip (36).

8. A progressive cavity drilling tool having a variable torque structure as defined in claim 7, wherein: the circle centers of the extending block (35) and the matching ring (34) are on the same straight line, the diameter of the matching ring (34) is larger than that of the extending block (35), and the extending block (35) is made of stainless steel.

9. A progressive cavity drilling tool having a variable torque structure as defined in claim 1, wherein: the tightening device (4) comprises a chuck (41), a ring (42) is fixedly arranged on the inner surface of the chuck (41), a bolt (43) is movably inserted into the side edge of the ring (42), a clamping ring (44) is movably arranged in the inner cavity of the bolt (43), a pressing block (45) is fixedly arranged on the inner surface of the bolt (43), and a supporting strip (46) is fixedly arranged at the top of the pressing block (45).