CN216381211U - Anti-deviation drilling tool combination for vertical well rapid drilling - Google Patents

Abstract

The utility model relates to an anti-deviation drilling tool assembly for rapid drilling of a vertical well, which comprises a drill bit, a well bottom drilling tool, a first drill collar, a first flexible short section, a first centralizer, a second drill collar, a second flexible short section, a second centralizer and an upper drill string assembly, wherein the drill bit, the well bottom drilling tool, the first drill collar, the first flexible short section and the first centralizer are sequentially connected from bottom to top. When drilling in a well deviation borehole, the upper drill string assembly is laid on the lower borehole wall, the second centralizer is a first fulcrum, the middle of the second flexible short section is arched downwards, so that the upper end of the second drill collar is close to the lower borehole wall, the lower end of the second drill collar drives the lower end of the first centralizer serving as the second fulcrum to upwarp, the first flexible short section is lifted, the first flexible short section is arched upwards, the upper end of the first drill collar is close to the upper borehole wall, and therefore the drill bit points to the direction of the lower borehole wall. The utility model can realize the straightening and is suitable for the quick drilling of a vertical well.

Description

Anti-deviation drilling tool combination for vertical well rapid drilling

Technical Field

The utility model relates to a drilling tool assembly in petroleum and natural gas drilling operation, in particular to an anti-slant drilling tool assembly for fast drilling of a vertical well, and belongs to the technical field of drilling equipment and drilling processes.

Background

The vertical well is the most common well type at present, and how to make the vertical well fast and straight is the problem which is always attempted to be solved in the field of well drilling and is also a difficult problem. Currently proposed methods of straightening include both conventional drilling tools and automatic vertical drilling tools. The conventional drilling tools mainly comprise tower drilling tools, pendulum drilling tools, full-hole drilling tools, off-axis drilling tools, eccentric double-center spiral stabilizer anti-inclination drilling tools and the like, and the inclination reducing capability of the drilling tools cannot meet the requirements of large well depths, complex wells, high and steep structures and large inclination angle strata, and even the drilling pressure is sacrificed as a condition, so that the drilling tools are difficult to realize inclination prevention and quick drilling. The automatic vertical well drilling tool mainly comprises a Power V system of Schlumberger company, a Vertitak system of BakerHughes Inteq company, a ZEB system of German intelligent company and the like, and the systems have good application effects, but the cost is overhigh in the using process, and the performance of the automatic vertical well drilling tool is influenced and the popularization and the application are limited when the underground is high in temperature and pressure.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the problems in the prior art and provide an anti-inclination drilling tool assembly which is simple in structure and low in cost and is used for quickly drilling a straight well.

In order to solve the technical problem, the anti-deviation drilling tool assembly for the rapid drilling of the vertical well comprises a drill bit, a well bottom drilling tool, a first drill collar, a first flexible short section, a first centralizer, a second drill collar, a second flexible short section, a second centralizer and an upper drill string assembly, wherein the drill bit, the well bottom drilling tool, the first drill collar, the first flexible short section, the first centralizer, the second drill collar, the second flexible short section, the second centralizer and the upper drill string assembly are sequentially connected from bottom to top.

As a preferred aspect of the utility model, the diameter of the downhole drilling tool is greater than or equal to the diameter of the first drill collar.

As a further preferable scheme of the utility model, the length of the first drill collar is 15-25 m, the length of the first flexible short joint is 2-6 m, the length of the second drill collar is 15-25 m, and the length of the second flexible short joint is 2-6 m.

As a further preferable aspect of the present invention, the first centralizer and the second centralizer each have an outer diameter smaller than and adapted to the outer diameter of the drill bit.

As a further preferred aspect of the utility model, the diameter of the first drill collar is greater than the diameter of the first flexible sub, and the diameter of the second drill collar is greater than the diameter of the second flexible sub.

As a further preferable scheme of the present invention, the drill comprises a tool cylinder and a drill body which are mutually screwed, the lower end of the drill body is provided with a plurality of blades, pulse nozzles are respectively arranged between the blades, the upper part of a central flow channel of the tool cylinder is provided with a cylinder box, a cylinder stepped hole is arranged below the cylinder box, a flow conductor is arranged in the cylinder stepped hole, a flow conductor central hole is arranged along the axis of the flow conductor, a downwardly extending mandrel is arranged in the flow conductor central hole, a plurality of flow guide grooves which are obliquely and downwardly extending are uniformly distributed on the circumference of the flow conductor, and two ends of each flow guide groove are communicated with the central flow channel of the tool cylinder; the upper part and the lower part of the central hole of the flow guide body are respectively provided with a flow guide body counter bore, and the mandrel is supported in the flow guide body counter bore through a bearing; an impeller matched with the central flow channel of the tool barrel is arranged below the flow guide body, and the impeller is fixed on the mandrel.

As a further preferable scheme of the utility model, a drill water cavity is arranged along the axis of the drill body, a drill water cavity shoulder is arranged at the lower part of the drill water cavity, a static valve disc is mounted on the drill water cavity shoulder, a plurality of static disc overflow grooves are uniformly distributed on the circumference of the static valve disc, a static disc centering counter bore is arranged at the center of the upper end face of the static valve disc, and a centering end at the lower end of the mandrel is inserted into the static disc centering counter bore and is in clearance fit with the static disc centering counter bore; a movable valve disc covers the upper portion of the static valve disc, a plurality of movable disc overflowing grooves are uniformly distributed on the circumference of the movable valve disc, and the movable valve disc is fixed on the mandrel and a gap is reserved between the movable valve disc and the static valve disc.

As a further preferable scheme of the utility model, a first mandrel clamp spring groove is formed in the upper part of the mandrel, a first mandrel thread is arranged below the first mandrel clamp spring groove, a mandrel nut is screwed on the first mandrel thread, the bottom of the mandrel nut is pressed above a bearing on the mandrel, the bearing on the mandrel is supported in a counter bore on the flow guide body, the top of the mandrel nut abuts against the lower part of a first shaft check ring, and the first shaft check ring is embedded in the first mandrel clamp spring groove; the periphery of the counter bore on the flow guide body is provided with a shallow flow guide body step hole, the top of the mandrel is covered with a frustum-shaped top cover, the lower end of the frustum-shaped top cover is pressed at the top of the flow guide body, the inner edge of the lower end opening of the frustum-shaped top cover is provided with a frustum-shaped top cover spigot extending downwards, the frustum-shaped top cover spigot is embedded in the flow guide body step hole, and the outer edge of the lower part of the frustum-shaped top cover is flush with the inner edge of each flow guide groove.

As a further preferable scheme of the present invention, the lower bearing of the mandrel is supported in the lower counter bore of the flow conductor, the bottom of the lower bearing of the mandrel is supported on the lower bearing cover, the outer circumference of the lower bearing cover is bent upwards and embedded in the U-shaped ring groove of the lower end surface of the flow conductor and is provided with a labyrinth seal, and the bottom of the lower bearing cover is supported on the shoulder of the boss of the mandrel.

Compared with the prior art, the utility model has the following beneficial effects: the anti-inclination drilling tool assembly is simple in structure, is formed by only combining common drilling tools, is low in manufacturing cost and using cost compared with the existing drilling tools, is stable in performance, and does not bring risks to drilling operation in other aspects in the using process.

The anti-inclination drilling tool combination realizes organic unification of two anti-deviation and deviation-rectifying effects of exerting strong pendulum force on the drill bit and promoting the direction of the positive cutting surface of the drill bit to turn to the inclination direction, and the anti-inclination and deviation-rectifying effects are excellent.

The anti-deviation drilling tool assembly has more obvious anti-deviation effect when the drilling pressure is larger, can release the drilling pressure, has performance not influenced by the well bottom condition, and is beneficial to improving the drilling speed.

The anti-inclination drilling tool combination can be used for deviation rectification and can also be used for straight borehole drilling, and the application range is wide.

The lateral cutting capability of the drill bit can be enhanced by the fact that the gauge-retaining cutting teeth of the drill bit in the anti-slant drilling tool assembly are 0.5-5 mm higher than the gauge-retaining blocks. When the drill bit is subjected to lateral forces of the same magnitude, the cutting capacity of the drill bit on the lower well wall is increased compared with the conventional drill bit, so that the inclination reducing effect is enhanced.

The drill bit disclosed by the utility model can enable a pulse nozzle corresponding to the lower part to generate pulse jet flow, so that characteristics such as different pulse frequencies can be obtained, the requirements of different field working conditions can be met, and the service life is long.

And the flow channels on the movable valve disc and the static valve disc can be periodically communicated or closed without external power, so that the flow area of the drilling fluid is changed, the continuous drilling fluid jet is modulated into pulse jet, and the pulse jet directly acts on the stratum through the pulse nozzle.

Drawings

The utility model will be described in further detail with reference to the following drawings and detailed description, which are provided for reference and illustration purposes only and are not intended to limit the utility model.

Fig. 1 is a schematic view of the whole structure of the anti-slant drilling assembly for vertical well fast drilling according to the present invention.

FIG. 2 is a schematic representation of the operation of an embodiment of the present invention in a deviated wellbore.

Fig. 3 is a schematic structural view of the drill bit of the present invention.

FIG. 4 is a cross-sectional view of the tool barrel of FIG. 3;

fig. 5 is a cross-sectional view of the flow conductor of fig. 3;

fig. 6 is a perspective view of the current carrier of fig. 3;

FIG. 7 is a front view of the mandrel of FIG. 3;

FIG. 8 is a cross-sectional view of the impeller of FIG. 3;

FIG. 9 is a perspective view of the impeller of FIG. 3;

FIG. 10 is a top view of the movable valve disk of FIG. 3;

FIG. 11 is a front view of the static valve disc of FIG. 3;

FIG. 12 is a top view of FIG. 11;

FIG. 13 is a front view of the bit body of FIG. 3;

FIG. 14 is a bottom view of FIG. 13;

fig. 15 is a perspective view of fig. 13.

In the figure: A. an upper drill string assembly; B. a second centralizer; C. a second flexible short section; D. a second drill collar; E. a first centralizer; F. a first flexible sub; G. a first drill collar; H. a downhole drilling tool; J. a drill bit; 1. a tool barrel; 1a, a cylinder female buckle; 1b, a stepped hole of the cylinder body; 1c, a barrel clamp spring groove; 1d, a key groove of the cylinder body; 2. a drill bit body; 2a, a drill bit water cavity; 2b, a drill water cavity shoulder; 2c, a drill key groove; 2d, a drill bit clamp spring groove; 2e, a pulse nozzle; 2f, a blade; 3. a flow conductor; 3a, a diversion trench; 3b, forming a counter bore on the flow guide body; 3c, a flow guide body step hole; 3d, sinking a lower counter bore of the flow guide body; ring groove 3 e.U; 3f, a deflector key groove; 3g, a flow conductor flat key; 4. a mandrel; 4a, a first mandrel clamp spring groove; 4b, a first mandrel thread; 4c, mandrel boss; 4d, mandrel thread II; 4e, a mandrel clamp spring groove II; 4f, mandrel thread III; 4g, a mandrel clamp spring groove III; 4h, supporting the positive end; 5. an impeller; 5a, an impeller step hole; 5b, impeller threaded holes; 6. a movable valve disc; 6a, moving disc overflowing grooves; 7. a static valve disk; 7a, a static disc overflow groove; 7b, righting the counter bore by the static disc; 7c, a static disk key groove; 7d, a static plate flat key; 8. a frustum-shaped top cover; a frustum-shaped top cover spigot; 9. a spindle nut; 10. a bearing on the mandrel; 11. a mandrel lower bearing; 12. a lower bearing cap; 13. a first shaft retainer ring; 14. a second shaft retainer ring; 15. a third retaining ring for the shaft; 16. a first hole retainer ring; 17. and a second hole retainer ring.

Detailed Description

The utility model will be described in further detail with reference to the following drawings and detailed description, which are provided for reference and illustration purposes only and are not intended to limit the utility model.

As shown in figure 1, the anti-deviation drilling tool assembly for the rapid drilling of the vertical well comprises a drill bit J, a bottom hole drilling tool H, a first drill collar G, a first flexible short section F, a first centralizer E, a second drill collar D, a second flexible short section C, a second centralizer B and an upper drill string assembly A, wherein the drill bit J, the bottom hole drilling tool H, the first drill collar G, the first flexible short section F, the first centralizer E, the second drill collar D, the second flexible short section C, the second centralizer B and the upper drill string assembly A are sequentially connected from bottom to top.

The lengths, the inner diameters and the outer diameters of the first drill collar G, the first flexible short section F, the first centralizer E, the second drill collar D, the second flexible short section C, the second centralizer B and the upper drill string assembly A are designed and adjusted according to the actual situation of a field borehole.

Preferably, the diameter of the downhole drilling tool H is greater than or equal to the diameter of the first drill collar G.

Preferably, the length of the first drill collar G is 15-25 m, the length of the first flexible short section F is 2-6 m, the length of the second drill collar D is 15-25 m, and the length of the second flexible short section C is 2-6 m.

Preferably, the outer diameters of the first centralizer E and the second centralizer B are smaller than and matched with the outer diameter of the drill bit J.

Preferably, the diameter of the first drill collar G is greater than the diameter of the first flexible sub F, and the diameter of the second drill collar D is greater than the diameter of the second flexible sub C.

Preferably, the first centralizer E and the second centralizer B can be helical centralizers or straight edge centralizers.

As shown in fig. 3 to 9, a drill J of the present invention includes a tool cylinder 1, a drill body 2 is screwed below the tool cylinder 1, a plurality of blades 2f are provided at a lower end of the drill body 2, pulse nozzles 2e are provided between the blades 2f, a cylinder female buckle 1a is provided at an upper portion of a central flow passage of the tool cylinder 1, a cylinder stepped hole 1b is provided below the cylinder female buckle 1a, a flow conductor 3 is installed in the cylinder stepped hole 1b, a flow conductor central hole is provided along an axis of the flow conductor 3, a spindle 4 extending downward is installed in the flow conductor central hole, a plurality of flow guide grooves 3a extending downward in an inclined manner are uniformly distributed on a circumference of the flow conductor 3, and both ends of each flow guide groove 3a are communicated with the tool cylinder central flow passage; the upper part and the lower part of the central hole of the flow guide body are respectively provided with a flow guide body counter bore, and the mandrel 4 is supported in the flow guide body counter bore through a bearing. An impeller 5 matched with a central flow channel of the tool cylinder is arranged below the flow guide body 3, and the impeller 5 is fixed on the mandrel 4.

As shown in fig. 5, 6 and 9, the inclination direction of the diversion trench 3a relative to the axis is opposite to the inclination direction of the blades of the impeller 5, so that the impeller 5 can make full use of the hydraulic energy of the incoming flow of the diversion body 3 to convert the hydraulic energy of the drilling fluid into mechanical kinetic energy, and the lower movable valve disk 6 is driven to rotate by the mandrel 4. The flowing channels on the movable valve disc 6 and the static valve disc 7 can be periodically communicated or closed without external power, so that the flowing area of the drilling fluid is changed, the continuous drilling fluid jet is modulated into pulse jet, and the pulse jet directly acts on the stratum through the pulse nozzle 2e.

As shown in fig. 9, the blade angle of the impeller 5 is 35 °, and the cross-sectional shape of each blade of the impeller is generally "opposite" to convert the hydraulic energy of the drilling fluid into the rotational kinetic energy of the impeller 5 with the highest efficiency.

As shown in fig. 3 and 11 to 15, a drill water cavity 2a is arranged along the axis of the drill body 2, a drill water cavity shoulder 2b is arranged at the lower part of the drill water cavity 2a, a static valve disc 7 is mounted on the drill water cavity shoulder 2b, a plurality of static disc overflow grooves 7a are uniformly distributed on the circumference of the static valve disc 7, a static disc centering counter bore 7b is arranged at the center of the upper end face of the static valve disc 7, and a centering end 4h at the lower end of the mandrel 4 is inserted into the static disc centering counter bore 7b and is in clearance fit with the same; the righting end 4h at the lower end of the mandrel 4 is coated with a hard wear-resistant layer. The counter bore 7b is right to the quiet dish provides central location for the right end 4h of righting of 4 lower extremes of dabber, guarantees that the lower extreme of dabber 4 is placed in the middle, rights end 4h periphery and is equipped with stereoplasm wearing layer and clearance fit and play the effect of righting the bearing, is lubricated by drilling fluid.

As shown in fig. 3 and 10, a movable valve disk 6 covers the static valve disk 7, a plurality of movable disk flow passing grooves 6a are uniformly distributed on the circumference of the movable valve disk 6, and the movable valve disk 6 is fixed on the mandrel 4 and has a gap with the static valve disk 7. The shapes and the opening areas of the openings on the static valve disk 7 and the movable valve disk 6 are the same, the shapes of the static disk overflow groove 7a and the movable disk overflow groove 6a are fan-shaped, triangular, rectangular or circular, and the number of the openings is 2, 3, 4, 5 or 6.

As shown in fig. 3, 5 and 7, a mandrel clamp spring groove one 4a is formed in the upper portion of the mandrel 4, a mandrel thread one 4b is arranged below the mandrel clamp spring groove one 4a, a mandrel nut 9 is screwed on the mandrel thread one 4b, the bottom of the mandrel nut 9 is pressed above a mandrel upper bearing 10, the mandrel upper bearing 10 is supported in a counter bore 3b in the flow guide body, the top of the mandrel nut 9 abuts against the lower portion of a shaft retainer ring one 13, and the shaft retainer ring one 13 is embedded in the mandrel clamp spring groove one 4 a; the periphery of the upper counter bore 3b of the flow guide body is provided with a shallow flow guide body step hole 3c, the top of the mandrel is covered with a frustum-shaped top cover 8, the lower end of the frustum-shaped top cover 8 is pressed on the top of the flow guide body 3, the inner edge of the lower end port of the frustum-shaped top cover 8 is provided with a frustum-shaped top cover spigot 8a extending downwards, the frustum-shaped top cover spigot 8a is embedded in the flow guide body step hole 3c, and the outer edge of the lower part of the frustum-shaped top cover 8 is flush with the inner edge of each flow guide groove 3a.

The mandrel nut 9 is screwed on the mandrel thread I4 b, the mandrel upper bearing 10 is pressed in the guide body upper counter bore 3b, and the mandrel nut 9 is axially positioned on the mandrel 4 by the shaft check ring I13; the lower bearing cover 12 presses the mandrel lower bearing 11 in the lower counter bore 3d of the flow guide body, the mandrel upper bearing 10 and the mandrel lower bearing 11 are both thrust bearings, and the mandrel nut 9 is supported on the upper end face of the mandrel upper bearing 10 to provide the suspension force of the mandrel 4. The mandrel boss 4c realizes axial positioning of the mandrel 4, preventing the reaction force of the liquid flow from causing the mandrel 4 to move upwards.

The mandrel lower bearing 11 is supported in the lower counter bore 3d of the flow guide body, the bottom of the mandrel lower bearing 11 is supported on the lower bearing cover 12, the outer circumference of the lower bearing cover 12 is bent upwards and embedded in the U-shaped annular groove 3e of the lower end face of the flow guide body 3, a labyrinth seal is arranged, and the bottom of the lower bearing cover 12 is supported on the shoulder of the mandrel boss 4c.

The central body of the flow guide body 3 is utilized to install the mandrel 4 and the bearing thereof, so that a bearing seat is prevented from being independently arranged in a water flow channel, and the resistance to water flow is greatly reduced. The frustum-shaped top cover 8 uniformly guides water flow to each flow guide groove 3a of the flow guide body 3, and the lower end of the frustum-shaped top cover 8 is in smooth transition with the upper end opening of each flow guide groove 3a, so that the resistance of the water flow is further reduced.

The upper end of the mandrel 4 is positioned in the inner cavity of the frustum-shaped top cover 8, the frustum-shaped top cover 8 completely covers the upper end of the mandrel, the mandrel nut 9 and the mandrel upper bearing 10, and the frustum-shaped top cover spigot 8a is embedded in the flow guide body step hole 3c, so that static sealing can be conveniently and reliably carried out. The problems that the dynamic sealing is difficult, the sealing is unreliable and the service life of the bearing is short due to the fact that the mandrel 4 penetrates through the top cover are solved. The bottom of the lower bearing cover 12 can be supported by the mandrel boss 4c, and the axial positioning is reliable; the outer circle of the lower bearing cap 12 is embedded in the U-shaped annular groove 3e on the lower end surface of the flow guide body 3, which is beneficial to labyrinth sealing. The upper bearing 10 and the lower bearing 11 of the mandrel are positioned in a reliable and sealed space, so that the erosion of drilling fluid can be prevented, and the service life of the bearings is ensured.

A mandrel thread II 4d is arranged below the mandrel boss 4c, and a mandrel clamp spring groove II 4e is arranged below the mandrel thread II 4 d; an impeller step hole 5a with a large diameter and an impeller threaded hole 5b with a small diameter are formed in the impeller 5 from top to bottom along the axis, the mandrel boss 4c is embedded in the impeller step hole 5a, the inner step at the bottom of the impeller step hole 5a is abutted to the lower shoulder of the mandrel boss 4c, the impeller threaded hole 5b is screwed on the mandrel thread II 4d, the bottom of the impeller 5 is abutted to the shaft retainer ring II 14, and the shaft retainer ring II 14 is embedded in the mandrel clamp spring groove II 4e.

The bottom of the flow guide body 3 is supported on the inner step at the bottom of the stepped hole 1b of the cylinder body, the top of the flow guide body 3 is pressed below a first hole check ring 16, and the first hole check ring 16 is embedded in a clamp spring groove 1c of the cylinder body; the outer wall of the baffle 3 is provided with at least one baffle key groove 3f extending along the axial direction, the inner wall of the barrel step hole 1b is provided with a barrel key groove 1d, and a baffle flat key 3g is embedded in the baffle key groove 3f and the barrel key groove 1d.

The shoulder of the barrel step hole 1b and the hole use the first retaining ring 16 to realize the axial positioning of the flow guide body 3 in the tool barrel 1, and the flow guide body flat key 3g realizes the radial positioning of the flow guide body 3 between the tool barrel 1. The impeller 5 is screwed on the second mandrel thread 4d, and the axial positioning between the impeller 5 and the mandrel 4 is realized by the mandrel boss 4c and the second shaft retainer ring 14.

The central screw hole of the movable valve disc 6 is screwed on the mandrel thread III 4f at the lower part of the mandrel 4, the upper part of the movable valve disc 6 is abutted against a shoulder above the mandrel thread III 4f, the lower part of the movable valve disc 6 is abutted against the shaft retainer ring III 15, the shaft retainer ring III 15 is clamped in the mandrel clamp spring groove III 4g below the mandrel thread III 4f, and the bottom of the shaft retainer ring III 15 is higher than the top surface of the static valve disc 7. The central threaded hole of the movable valve disc 6 is screwed on the mandrel thread III 4f, and the shoulder above the mandrel thread III 4f and the shaft retaining ring III 15 realize the axial positioning of the movable valve disc 6. And a gap is reserved between the movable valve disc 6 and the static valve disc 7, so that mutual friction between the movable valve disc 6 and the static valve disc 7 can be avoided, and the resistance of the movable valve disc 6 in rotation is reduced.

As shown in fig. 3 and 12, at least one stationary disk key groove 7c is formed in the periphery of the stationary valve disk 7, a drill key groove 2c extending to the drill water cavity shoulder 2b along the axial direction is formed in the inner wall of the drill water cavity 2a, and a stationary disk flat key 7d is embedded in the drill key groove 2c and the stationary disk key groove 7 c; the inner wall of the lower part of the drill bit water cavity 2a is provided with a drill bit clamp spring groove 2d, a hole check ring II 17 is embedded in the drill bit clamp spring groove 2d, and the bottom of the hole check ring II 17 is pressed on the top of the static valve disk 7. The drill water cavity shoulder 2b and the hole retainer ring II 17 realize the axial positioning of the static valve disc 7 in the drill water cavity 2a, and the static disc flat key 7d realizes the radial positioning of the static valve disc 7 in the drill water cavity 2a.

The high-pressure water flow spirally flows out downwards through the guide grooves 3a on the periphery of the guide body 3, then the impeller 5 is driven to drive the mandrel 4 to rotate, the movable valve disc 6 on the lower portion of the mandrel 4 synchronously rotates along with the mandrel 4, and the movable disc overflowing grooves 6a and the static disc overflowing grooves 7a are alternately communicated or closed, so that the corresponding pulse nozzles 2e below the movable disc overflowing grooves are enabled to generate pulse jet flow.

The tool cylinder 1 is directly connected with the drill bit body 2, the movable valve disc 6 and the static valve disc 7 are directly arranged at the lower part of the drill bit water cavity 2a, the length of the tool and the distance between the movable valve disc and the pulse nozzle 2e are shortened as far as possible, pulse jet flow directly acts on the bottom of a well through a drill bit water hole, and a pulse alternating flow field is generated to solve the problem of weakening of the pulse jet flow along the way. The impellers 5 with different specifications and the valve discs with different hole numbers can obtain the characteristics of different pulse frequencies and the like, and can meet the requirements of different field working conditions.

As shown in FIG. 2, when the anti-deviation drilling tool assembly for rapid drilling of a vertical well drills in a well with a deviation, the upper drill string assembly A is laid on the lower well wall, the second centralizer B is used as a first fulcrum, the middle lower bow of the second flexible short section C enables the upper end of the second drill collar D to be close to the lower well wall, the lower end of the second drill collar D drives the lower end of the first centralizer E used as a second fulcrum to tilt up and lift the first flexible short section F, the middle upper bow of the first flexible short section F is enabled to be close to the upper well wall, and therefore the drill bit points to the direction of the lower well wall, and the deviation reducing effect of the anti-deviation drilling tool assembly is achieved. The deviation rectifying mechanism is that the first drill collar G and the well bottom drilling tool H are utilized to apply strong pendulum force to the drill bit and promote the positive cutting surface of the drill bit to turn to the deviation reducing direction to realize combined action deviation prevention and deviation rectification.

When drilling in a straight borehole, the first flexible short section F and the second flexible short section C are bent, so that the whole anti-deviation drilling tool assembly is in a vortex motion state. The drilling field practice shows that the whole anti-deviation drilling tool combination is in a whirling motion state and has the anti-deviation straightening effect, so that the anti-deviation drilling tool combination has the anti-deviation straightening effect when the anti-deviation drilling tool combination works in a straight borehole.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention. In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention. Technical features of the present invention which are not described may be implemented by or using the prior art, and will not be described herein.

Claims (9)

1. An anticline drilling assembly for vertical well fast drilling, comprising a drill bit, characterized in that: the drilling tool comprises a drill bit, a well drilling tool body, a first drill collar, a first flexible short section, a first centralizer, a second drill collar, a second flexible short section, a second centralizer and an upper drill string assembly, wherein the drill bit, the well drilling tool body, the first drill collar, the first flexible short section, the first centralizer, the second drill collar, the second flexible short section, the second centralizer and the upper drill string assembly are sequentially connected from bottom to top.

2. The anti-backup assembly for vertical well fast drilling according to claim 1, wherein: the diameter of the downhole drilling tool is greater than or equal to the diameter of the first drill collar.

3. The anti-backup assembly for vertical well fast drilling according to claim 1, wherein: the length of the first drill collar is 15-25 meters, the length of the first flexible short section is 2-6 meters, the length of the second drill collar is 15-25 meters, and the length of the second flexible short section is 2-6 meters.

4. The anti-backup assembly for vertical well fast drilling according to claim 1, wherein: the outer diameters of the first centralizer and the second centralizer are smaller than the outer diameter of the drill bit and are matched with the outer diameter of the drill bit.

5. The anti-backup assembly for vertical well fast drilling according to claim 1, wherein: the diameter of the first drill collar is larger than that of the first flexible short joint, and the diameter of the second drill collar is larger than that of the second flexible short joint.

6. The anti-backup assembly for vertical well fast drilling according to claim 1, wherein: the drill bit comprises a tool cylinder and a drill bit body which are mutually screwed, a plurality of blades are arranged at the lower end of the drill bit body, pulse nozzles are respectively arranged among the blades, a cylinder female buckle is arranged at the upper part of a central flow passage of the tool cylinder, a cylinder stepped hole is arranged below the cylinder female buckle, a flow guide body is arranged in the cylinder stepped hole, a flow guide body central hole is arranged along the axis of the flow guide body, a core shaft extending downwards is arranged in the flow guide body central hole, a plurality of flow guide grooves extending downwards in an inclined mode are uniformly distributed on the circumference of the flow guide body, and two ends of each flow guide groove are communicated with the central flow passage of the tool cylinder; the upper part and the lower part of the central hole of the flow guide body are respectively provided with a flow guide body counter bore, and the mandrel is supported in the flow guide body counter bore through a bearing; an impeller matched with the central flow channel of the tool barrel is arranged below the flow guide body, and the impeller is fixed on the mandrel.

7. The anti-backup assembly for vertical well fast drilling according to claim 6, wherein: a drill bit water cavity is arranged along the axis of the drill bit body, a drill bit water cavity shoulder is arranged at the lower part of the drill bit water cavity, a static valve disc is mounted on the drill bit water cavity shoulder, a plurality of static disc overflow grooves are uniformly distributed on the circumference of the static valve disc, a static disc centering counter bore is arranged in the center of the upper end face of the static valve disc, and a centering end at the lower end of the mandrel is inserted into the static disc centering counter bore and is in clearance fit with the static disc centering counter bore; a movable valve disc covers the upper portion of the static valve disc, a plurality of movable disc overflowing grooves are uniformly distributed on the circumference of the movable valve disc, and the movable valve disc is fixed on the mandrel and a gap is reserved between the movable valve disc and the static valve disc.

8. The anti-backup assembly for vertical well fast drilling according to claim 6, wherein: the upper part of the mandrel is provided with a mandrel clamp spring groove I, a mandrel thread I is arranged below the mandrel clamp spring groove I, a mandrel nut is screwed on the mandrel thread I, the bottom of the mandrel nut is pressed above a mandrel upper bearing, the mandrel upper bearing is supported in a counter bore on the flow guide body, the top of the mandrel nut is abutted against the lower part of a shaft check ring I, and the shaft check ring I is embedded in the mandrel clamp spring groove I; the periphery of the counter bore on the flow guide body is provided with a shallow flow guide body step hole, the top of the mandrel is covered with a frustum-shaped top cover, the lower end of the frustum-shaped top cover is pressed at the top of the flow guide body, the inner edge of the lower end opening of the frustum-shaped top cover is provided with a frustum-shaped top cover spigot extending downwards, the frustum-shaped top cover spigot is embedded in the flow guide body step hole, and the outer edge of the lower part of the frustum-shaped top cover is flush with the inner edge of each flow guide groove.

9. The anti-backup assembly for vertical well fast drilling according to claim 8, wherein: the lower bearing of the mandrel is supported in the lower counter bore of the flow guide body, the bottom of the lower bearing of the mandrel is supported on the lower bearing cover, the outer circumference of the lower bearing cover is bent upwards and embedded in the U-shaped ring groove of the lower end face of the flow guide body, a labyrinth seal is arranged, and the bottom of the lower bearing cover is supported on the shoulder of the boss of the mandrel.

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