CN114412383A - Large-drift-diameter all-metal hollow screw drill driven casing guide shoe system - Google Patents

Abstract

The invention discloses a large-diameter all-metal hollow screw drill driven casing guide shoe system which comprises a system body, wherein the system body comprises a screw power part, a flexible connecting part, a bearing part and a casing guide shoe. The screw power part provides the same torque and power under the condition of shorter length compared with the turbine structure, so the screw power part is suitable for various application occasions needing high and low torque during casing running operation. The casing guide shoe system driven by the large-drift-diameter all-metal hollow screw drilling tool can also be used for casing drilling operation, the hydraulic drive is adopted to perform the casing drilling operation without rotating the whole pipe column, and the efficiency and the adaptability of the casing drilling operation are improved. Meanwhile, the time for dropping internal parts is saved, and the operation cost for casing pipe running or casing pipe drilling is greatly saved.

Description

Large-drift-diameter all-metal hollow screw drill driven casing guide shoe system

Technical Field

The invention relates to the technical field of petroleum and natural gas, in particular to a tool for driving a casing guide shoe or a drill shoe to perform casing drilling or help or promote the smooth running of a casing into a preset position in the process of casing or tail pipe running in a petroleum or natural gas well completion, and particularly relates to a casing guide shoe system driven by a large-drift-diameter all-metal hollow screw drilling tool.

Background

During the process of drilling and casing in an oil or natural well, the casing is successfully lowered to a preset depth at one time, which is important for completing a preset target. During the casing running process, due to various reasons such as stratum stability, well track and the like, various factors such as borehole shrinkage, collapse, large frictional resistance and the like which are not beneficial to the casing running in place can be caused. If the drilling-in depth is not the preset depth, the later operation difficulty is increased, or the resources of the target layer cannot be exploited. If the casing running process is not smooth, the operation time is increased, and the cost is increased.

In order to facilitate the smooth running of the casing to the desired depth, it is sometimes possible to rotate the casing by mechanical power at the wellhead to effect reaming through difficult sections of the well due to shrinkage, collapse, etc. This approach has significant limitations. Rotation of the casing is often not possible due to torque limitations of the casing connection threads or surface equipment. Therefore, a hydraulic drive downhole tool is needed to drive a casing guide shoe to help to lower the casing to a preset position, and meanwhile, after the casing is lowered to the preset position in an auxiliary mode of utilizing the hydraulic drive casing guide shoe, a drill bit drilling tool is often needed to be lowered to carry out the drilling and completion operation of the next stage through the tool.

In order to facilitate the passage of the drill bit through the bore, it is common to manufacture the internal components of the hydraulically driven tool from a drillable material such as an aluminium alloy, which is very time consuming to drill through even the drillable material; and the mechanical properties of the easily drilled material are poor, which affects the service life of the tool. Downhole hydraulic drive motors can be divided into three major categories: screw configurations, turbine configurations, and other configurations. The turbine structure has the advantages that the torque generated by a single-section turbine section is very small, a large number of turbine sections are needed, the structure is complex, the length is generally far longer than other tools, and the overlong length is often not matched with the actual requirement; the rotating speed of the turbine drilling tool is more than 1000 revolutions per minute, which is very unfavorable for the performance of the downhole tool and the service life of a bearing system and a guide shoe; for a screw rod structure, a stator with glue injected inside is generally adopted, and due to the space occupied by rubber, enough large drift diameter cannot be basically realized; while other structures of hydraulic drive motors are rarely applied, the generated torque is often relatively small, and the requirements of practical application cannot be met. Therefore, there is a need for a large-bore all-metal cannulated screw drill driven casing guide system that at least partially solves the problems of the prior art.

Disclosure of Invention

In this summary, concepts in a simplified form are introduced that are further described in the detailed description. This summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

To at least partially solve the above problems, the present invention provides a casing guide system driven by a large-bore all-metal hollow screw drill, comprising: the system body comprises a screw power part, a flexible connecting part, a bearing part and a sleeve guide shoe, wherein the flexible connecting part is arranged in the screw power part, the bearing part is arranged in the screw power part and is positioned at the front part of the screw power part, and the sleeve guide shoe is arranged at the front end of the screw power part.

According to the casing guide shoe system driven by the large-diameter all-metal hollow screw drill, the screw power part comprises a screw motor stator and a screw rotor, and the screw rotor is arranged inside the screw motor stator.

According to the casing guide shoe system driven by the large-bore all-metal hollow screw drill tool, an inner spiral body is arranged on the inner wall of the screw motor stator, and an outer spiral body corresponding to the inner spiral body is arranged on the outer wall of the screw rotor.

According to the casing guide shoe system driven by the large-diameter all-metal hollow screw drill, the flexible connecting part comprises a large-diameter flexible shaft, the rear end of the flexible shaft is connected with the front end of the screw rotor, the front end of the screw rotor extends into the rear end of the flexible shaft, and the flexible shaft is a slotted flexible pipe.

According to the casing guide shoe system driven by the large-bore all-metal hollow screw drill, the end face of the flexible shaft is internally provided with the rupture disc.

According to the casing guide system driven by the large-diameter all-metal hollow screw drill, the bearing portion comprises an inner mandrel, a bearing outer tube, two first bearings and two second bearings, the rear end of the inner mandrel extends into the front end of the flexible shaft, the bearing outer tube is sleeved on the inner mandrel, the rear end of the bearing outer tube extends into the front end of the screw motor stator, one first bearing is sleeved on the inner mandrel and located at the rear end of the bearing outer tube, a baffle ring is arranged on the inner mandrel and located in front of the rear end of the bearing outer tube, one second bearing is located at the rear side of the baffle ring, the other first bearing and the other second bearing are located at the front side of the baffle ring, and a limiting ring is arranged at the front end of the inner mandrel.

According to the casing guide shoe system driven by the large-bore all-metal hollow screw drill, the casing guide shoe comprises a guide shoe body, the guide shoe body is arranged at the front end of the inner mandrel, and a plurality of liquid discharge holes are formed in the guide shoe body.

According to the casing guide shoe system driven by the large-bore all-metal hollow screw drill, the rear end of a screw motor stator is connected with a liquid guide cylinder through a leakage-proof assembly and a tensioning assembly, a first inner connecting cylinder is arranged in the screw motor stator, a second inner connecting cylinder is arranged in the liquid guide cylinder, the first inner connecting cylinder extends into the liquid guide cylinder, a pre-tightening retainer ring is arranged between the first inner connecting cylinder and the second inner connecting cylinder, a circumferential groove is formed in the end of the screw motor stator, the leakage-proof assembly is arranged in the circumferential groove, the leakage-proof assembly comprises an inner spring, an inner retainer ring body, a middle bone sleeve and an outer leakage-proof sheet, the inner spring is located at the inner bottom of the circumferential groove and abuts against the inner retainer ring body, the middle bone sleeve is located on the left side of the inner retainer ring body, and the outer leakage-proof sheet is located on the left side of the middle bone sleeve, be provided with a plurality of first location hemispheres on the outer anti-leakage piece, be provided with on the terminal surface of drain barrel a plurality ofly with the first positioning groove that first location hemisphere corresponds, be provided with second location hemisphere in the first positioning groove, be provided with the second positioning groove who corresponds with second location hemisphere on the first location hemisphere, taut subassembly is used for connecting the screw motor stator drain barrel is connected.

According to the casing shoe guiding system driven by the large-diameter all-metal hollow screw drill, the tensioning assembly comprises a locking part, a plurality of tensioning barrels, a plurality of guide pillars and a plurality of tensioning seats, the locking part is arranged on the liquid guide barrel, the plurality of tensioning seats and the plurality of guide pillars are uniformly distributed on the screw motor stator, a tensioning groove facing away from the liquid guide barrel is formed in each tensioning seat, the guide pillars are located on the left side of each tensioning seat, a plurality of tensioning hooks are arranged at the right end of each tensioning barrel and extend into the tensioning grooves, a plurality of inner strip-shaped grooves are formed in the inner wall of each tensioning barrel, the upper ends of the guide pillars are located in the inner strip-shaped grooves, an outer tensioning barrel is arranged at the left end of each tensioning barrel, and the outer tensioning barrel is movably connected with the locking part.

According to the large-diameter all-metal hollow screw drilling tool-driven casing guide shoe system provided by the embodiment of the invention, the locking part comprises a locking seat ring, a locking nut, a locking sleeve, a pulling sleeve and a plurality of braking mechanisms, the locking seat ring is sleeved on the liquid guide cylinder, the locking nut is screwed on the locking seat ring, a notch groove is formed in the locking nut, the locking sleeve is rotatably arranged on the locking nut and is fixedly connected with the outer pulling elastic cylinder, the braking mechanism comprises a braking cylinder, a braking spring and a braking ejector rod, the braking cylinder is arranged on the left side of the locking seat ring, the braking spring is arranged in the braking cylinder, the left end of the braking ejector rod is positioned in the braking cylinder and is connected with the braking spring, the right end of the braking ejector rod extends into the braking groove of the locking nut, and the pulling sleeve is positioned on the outer side of the braking ejector rod, and is connected with the brake ejector rod through an internal connecting rod, and the brake cylinder is provided with a brake strip-shaped hole corresponding to the internal connecting rod.

Compared with the prior art, the invention at least comprises the following beneficial effects:

the invention provides a large-diameter all-metal hollow screw drill driven casing guide system, which comprises: the system body, specifically, this system body includes screw rod power portion, flexonics portion, bearing portion and sleeve pipe guide shoe, and inside high-pressure drilling fluid entered into screw rod power portion, and then made screw rod power portion drive flexonics portion and rotated to flexonics portion passes through the bearing portion and drives the sleeve pipe guide shoe and rotate. The casing guide shoe system driven by the large-drift-diameter all-metal hollow screw drilling tool is of an all-metal structure and has no sealing piece, so that the casing guide shoe system is suitable for high-temperature and normal-temperature operation. The screw power part provides the same torque and power under the condition of shorter length compared with the turbine structure, so the screw power part is suitable for various application occasions needing high and low torque during casing running operation. The casing guide shoe system driven by the large-drift-diameter all-metal hollow screw drilling tool can also be used for casing drilling operation, the hydraulic drive is adopted for casing operation without rotating the whole pipe column, and the efficiency and the adaptability of the casing operation are improved. Meanwhile, the time for dropping internal parts is saved, and the casing drilling operation cost is greatly saved.

Other advantages, objects, and features of the present invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the present invention.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a right side view showing the structure of the guide shoe body in the present invention.

FIG. 3 is a schematic view of the screw rotor according to the present invention.

Fig. 4 is a schematic structural view of a flexible shaft according to the present invention.

FIG. 5 is a schematic view of a partial structure of a liquid guide cylinder according to the present invention.

Fig. 6 is a schematic view of the internal structure of the liquid guide cylinder according to the present invention.

Fig. 7 is an enlarged structural view of a portion a of fig. 6 according to the present invention.

Fig. 8 is a schematic structural view of the locking portion of the present invention.

Fig. 9 is a left side view showing the structure of the outer leakage preventing panel in the present invention.

Detailed Description

The present invention is further described in detail below with reference to the drawings and examples so that those skilled in the art can practice the invention with reference to the description.

It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.

As shown in fig. 1 to 4, the present invention provides a casing guide system driven by a large-bore all-metal hollow screw drill, comprising: the system body comprises a screw power part, a flexible connecting part, a bearing part and a sleeve guide shoe, wherein the flexible connecting part is arranged in the screw power part, the bearing part is arranged in the screw power part and is positioned at the front part of the screw power part, and the sleeve guide shoe is arranged at the front end of the screw power part.

The working principle and the beneficial effects of the technical scheme are as follows: the invention provides a large-diameter all-metal hollow screw drill driven casing guide system, which comprises: a system body, specifically, the system body comprises a screw power part, a flexible connecting part, a bearing part and a sleeve guide shoe, wherein the flexible connecting part is arranged in the screw power part, the bearing part is arranged in the screw power part and is positioned at the front part of the screw power part, and the sleeve guide shoe is arranged at the front end of the screw power part; the screw power part rotates under the driving of external power, and when high-pressure drilling fluid enters into the inside of the screw power part, the screw power part is made to drive the flexible connecting part to rotate, and the flexible connecting part drives the sleeve guide shoe to rotate through the bearing part. The casing guide shoe system driven by the large-drift-diameter all-metal hollow screw drilling tool is of an all-metal structure and has no sealing piece, so that the casing guide shoe system is suitable for high-temperature and normal-temperature operation. The screw power part provides the same torque and power under the condition of shorter length compared with the turbine structure, so the screw power part is suitable for various application occasions needing high and low torque during casing running operation. The casing guide shoe system driven by the large-drift-diameter all-metal hollow screw drilling tool can also be used for casing drilling operation, the hydraulic drive is adopted to perform the casing drilling operation without rotating the whole pipe column, and the efficiency and the adaptability of the casing drilling operation are improved. Meanwhile, the time for dropping internal parts is saved, and the casing drilling operation cost is greatly saved.

In one embodiment, the screw power section comprises a screw motor stator 1, a screw rotor 2, the screw rotor 2 being arranged inside the screw motor stator 1.

The working principle and the beneficial effects of the technical scheme are as follows: the embodiment provides a specific structure of a screw power part, the screw power part of the structure comprises a screw motor stator 1 and a screw rotor 2, specifically, the screw rotor 2 is installed inside the screw motor stator 1, when the screw motor stator 1 and the screw rotor 2 are installed, the screw motor stator 1 is fixed, and the screw rotor 2 is pushed into the screw motor stator 1 by a thrust oil cylinder; thread locking glue is uniformly coated on the end part threads of the screw rotor 2 and the matched threads of the flexible connecting part, and the threads are connected and tightened by using a pipe wrench; according to the working principle of the screw pump, the number of spiral thread heads of the stator 1 of the screw motor is generally the number of spiral thread heads of the rotor 2 of the screw plus 1 to form a sealed chamber. Therefore, when high-pressure drilling fluid flows through the screw power part, the high-pressure drilling fluid is extruded downwards from a spiral channel between the screw rotor 2 and the screw motor stator 1, a high-pressure chamber and a low-pressure chamber are formed between the screw rotor 2 and the screw motor stator 1, and the screw rotor 2 is driven to rotate under the action of pressure difference so as to drive the flexible connecting part to rotate.

In one embodiment, an inner spiral body 101 is disposed on the inner wall of the stator 1 of the progressive cavity motor, and an outer spiral body 201 corresponding to the inner spiral body 101 is disposed on the outer wall of the progressive cavity rotor 2.

The working principle and the beneficial effects of the technical scheme are as follows: in this embodiment, the inner wall of the screw motor stator 1 is provided with the inner spiral body 101, and the outer wall of the screw rotor 2 is provided with the outer spiral body 201, so that when the screw rotor 2 rotates in the screw motor stator 1, the outer spiral body 201 pushes the high-pressure drilling fluid backwards along the inner spiral body 101, and further the high-pressure drilling fluid is extruded downwards from a spiral channel between the screw rotor 2 and the screw motor stator 1, a high-pressure chamber and a low-pressure chamber are formed between the screw rotor 2 and the screw motor stator 1, and the screw motor stator 1 is driven to rotate under the action of pressure difference, so that the rotating power is provided.

In one embodiment, the flexible connection comprises a large-diameter flexible shaft 3, a rear end of the flexible shaft 3 is connected with a front end of the screw rotor 2, and the front end of the screw rotor 2 extends into the rear end of the flexible shaft 3.

The working principle and the beneficial effects of the technical scheme are as follows: this embodiment provides flexible connection portion including the flexible axle 3 of big latus rectum, and the rear end of flexible axle 3 is connected with screw rotor 2's front end here to in screw rotor 2's front end extended to flexible axle 3's rear end, when liquid promoted screw rotor 2 rotatory, screw rotor 2 drove flexible axle 3 rotatory, and flexible axle 3 drove bearing portion rotation, and bearing portion drove the sleeve pipe guide shoe and rotates. The flexible shaft 3 has two functions, that is, the eccentric motion of the screw rotor 2 is converted into the concentric motion, and the rotation of the screw rotor 2 is transmitted to the bearing portion.

In one embodiment, the flexible shaft 3 is provided as a slotted flexible tube.

The working principle and the beneficial effects of the technical scheme are as follows: in the present embodiment, the flexible shaft 3 is a slotted flexible pipe, where the flexible shaft 3 is a slotted flexible pipe, and the flexibility of the flexible shaft 3 is adjusted by adjusting the wall thickness of the flexible shaft 3 and the distribution of the slots. In addition, the connection can adopt a torsion spring connection, or a petal type universal connection or other universal connections which are usually adopted by a downhole screw drill.

In one embodiment, a rupture disc 4 is provided within the end face of the flexible shaft 3.

The working principle and the beneficial effects of the technical scheme are as follows: in this embodiment a rupture disc 4 is provided at the end face of the flexible shaft 3, the rupture disc having a generally dome-shaped, circular or other generally curved rupturable portion and being capable of acting in either a forward or reverse direction. A positive acting rupture disc is positioned to be exposed to the concave side of the rupturable portion of the pressurized system, thereby placing the disc under tension. Thus, when an overpressure condition is reached, i.e., when the system pressure exceeds a safe or desired level, the rupture disk may release pressure by bursting outward. Conversely, a reverse acting rupture disc (also known as a reverse buckling rupture disc) is positioned with its convex side exposed to the pressurized system, placing the material of the disc in compression. Thus, when an overpressure condition is reached, the rupture disc may be flexed and reversed, i.e., inverted and torn, to vent pressurized fluid.

In one embodiment, the bearing portion comprises an inner spindle 5, a bearing outer tube 9, two first bearings 7 and two second bearings 10, the rear end of the inner mandrel 5 extends into the front end of the flexible shaft 3, the bearing outer tube 9 is sleeved on the inner mandrel 5, the rear end of the bearing outer tube 9 extends into the front end of the screw motor stator 1, one of the first bearings 7 is sleeved on the inner mandrel 5 and positioned at the rear end of the bearing outer tube 9, a baffle ring 51 is arranged on the inner mandrel 5, the baffle ring 51 is positioned in front of the rear end of the bearing outer tube 9, one of the second bearings 10 is located at the rear side of the retainer ring 51, the other of the first bearings 7 and the second bearings 10 is located at the front side of the retainer ring 51, and the front end of the inner mandrel 5 is provided with a limiting ring 11.

The working principle and the beneficial effects of the technical scheme are as follows: the embodiment provides a specific structure of a bearing part, the bearing part of the structure comprises an inner mandrel 5, a bearing outer tube 9, two first bearings 7 and two second bearings 10, wherein the rear end of the inner mandrel 5 extends into the front end of the flexible shaft 3, the bearing outer tube 9 is installed on the inner mandrel 5, and the rear end of the bearing outer tube 9 extends into the front end of the screw motor stator 1, so that when high-pressure drilling fluid flows through the screw motor stator 1 and the screw rotor 2, the high-pressure drilling fluid is extruded downwards from a spiral channel between the screw rotor 2 and the screw motor stator 1, a high-pressure chamber and a low-pressure chamber are formed between the screw rotor 2 and the screw motor stator 1, the screw rotor 2 is driven to rotate under the action of pressure difference, the screw rotor 2 drives the inner mandrel 5 to rotate, and the bearing outer tube 9 is outside the inner mandrel 5;

in order to enable the inner mandrel 5 to rotate better, one of the first bearings 7 is sleeved on the inner mandrel 5 and is positioned at the rear end of the bearing outer tube 9, a baffle ring 51 is arranged on the inner mandrel 5, the baffle ring 51 is positioned in front of the rear end of the bearing outer tube 9, one of the second bearings 10 is positioned at the rear side of the baffle ring 51, the other first bearing 7 and the second bearing 10 are positioned at the front side of the baffle ring 51, meanwhile, due to the design of the structure, the inner mandrel 5 rotates better, the front end of the inner mandrel 5 is provided with a limiting ring 11, and the second bearing 10 is prevented from moving due to the fact that the limiting ring 11 is positioned at the front end of the second bearing 10; the first bearing 7 is a radial centering bearing, and the second bearing 10 is a thrust bearing.

In one embodiment, the casing guide comprises a guide body 12, the guide body 12 is arranged at the front end of the inner mandrel 5, and a plurality of liquid discharge holes 121 are arranged on the guide body 12.

The working principle and the beneficial effects of the technical scheme are as follows: the casing guide shoe in the embodiment comprises a guide shoe body 12, specifically, the guide shoe body 12 is installed at the front end of the inner mandrel 5, wherein the guide shoe body 12 is provided with a plurality of liquid discharge holes 121, one or more of alloy, diamond and diamond composite sheets can be selectively welded or embedded on the outer part of the casing guide shoe 12 according to needs, and wear resistance or reaming capability is provided; the casing guide 12 has a shape with a guiding function, the cross section of the casing guide is gradually reduced from top to bottom, and the cross section can be in any shape; the casing guide 12 is made of aluminum alloy or other materials easy to drill, or can be made of bimetal, and only the parts needing to be drilled through are made of materials easy to drill.

As shown in fig. 5-9, in one embodiment, the rear end of the progressive cavity motor stator 1 is connected to the fluid guide cylinder 13 through a leakage-proof assembly 20 and a tensioning assembly 30, a first internal cylinder 102 is disposed in the progressive cavity motor stator 1, a second internal cylinder 131 is disposed in the fluid guide cylinder 13, the first internal cylinder 102 extends into the fluid guide cylinder 13, a pre-tightening retainer ring 14 is disposed between the first internal cylinder 102 and the second internal cylinder 131, a circumferential groove 103 is disposed at an end of the progressive cavity motor stator 1, the leakage-proof assembly 20 is disposed in the circumferential groove 103, the leakage-proof assembly 20 includes an internal spring 201, an internal retainer ring body 202, an intermediate bone sleeve 203 and an external leakage-proof sheet 204, the internal spring 201 is located at an inner bottom of the circumferential groove 103 and abuts against the internal retainer ring body 202, the intermediate bone sleeve 203 is located at a left side of the internal retainer ring body 202, prevent outward that leakage piece 204 is located the left side of middle bone cover 203, prevent outward being provided with a plurality of first location hemispheres 205 on the leakage piece 204, be provided with on the terminal surface of leading a liquid section of thick bamboo 13 a plurality of with first location recess 132 that first location hemispheres 205 correspond, be provided with second location hemisphere 133 in the first location recess 132, be provided with the second location recess 206 that corresponds with second location hemisphere 133 on the first location hemisphere 205, taut subassembly 30 is used for connecting screw motor stator 1 leads a liquid section of thick bamboo 13 and connects.

The working principle and the beneficial effects of the technical scheme are as follows: in this embodiment, the screw motor stator 1 and the fluid guide cylinder 13 are connected through the leakage-proof component 20 and the tensioning component 30, so that the screw motor stator 1 is conveniently separated from the fluid guide cylinder 13 for maintenance, the first internal connecting cylinder 102 is installed in the screw motor stator 1, the second internal connecting cylinder 131 is installed in the fluid guide cylinder 13, the first internal connecting cylinder 102 extends into the fluid guide cylinder 13, and the pre-tightening retainer ring 14 is arranged between the first internal connecting cylinder 102 and the second internal connecting cylinder 131, so that the high-pressure drilling fluid passes through the first internal connecting cylinder 102 and the second internal connecting cylinder 131 without contacting an end face gap between the screw motor stator 1 and the fluid guide cylinder 13, and the leakage of the high-pressure drilling fluid in the process of entering the screw motor stator 1 from the fluid guide cylinder 13 can be prevented;

meanwhile, an anti-leakage component 20 is arranged between the end face between the screw motor stator 1 and the liquid guide cylinder 13, and the anti-leakage component 20 can further prevent leakage of high-pressure drilling fluid in the process of entering the screw motor stator 1 from the liquid guide cylinder 13; specifically, the leakage-proof assembly 20 includes an inner spring 201, an inner retainer ring 202, a middle bushing 203, and an outer leakage-proof sheet 204, wherein a circumferential groove 103 is formed at an end of the screw motor stator 1, the inner spring 201 is located at an inner bottom of the circumferential groove 103 and abuts against the inner retainer ring 202, so that the inner retainer ring 202 pushes the middle bushing 203 and the outer leakage-proof sheet 204 toward the liquid guide tube 13, so that the outer leakage-proof sheet 204 is tightly attached to an end surface of the liquid guide tube 13, the outer leakage-proof sheet 204 has a plurality of first positioning hemispheres 205, the end surface of the liquid guide tube 13 has a plurality of first positioning grooves 132 corresponding to the first positioning hemispheres 205, so that the first positioning hemispheres 205 extend into the first positioning grooves 132, and in order to further increase a fixed connection between the two, a second positioning hemispheres 133 is formed in the first positioning grooves 132, and a second positioning groove 206 is formed in the first positioning hemispheres 205, thus, the second positioning hemisphere 133 extends to the second positioning groove 206, where the first positioning hemisphere 205 may be made of a wear-resistant and corrosion-resistant silicone material or a rubber material; here, the screw motor stator 1 and the fluid guide tube 13 are further provided with a first flow guide layer 104 and a second flow guide layer 105, so that the high-pressure drilling fluid flows more smoothly inside the two.

In one embodiment, the tightening assembly 30 includes a locking portion 31, a plurality of tightening cylinders 32, a plurality of guide posts 34, and a plurality of tightening seats 35, the locking portion 31 is disposed on the liquid guide cylinder 13, the plurality of tightening seats 35 and the plurality of guide posts 34 are uniformly distributed on the screw motor stator 1, a tightening groove 351 facing away from the liquid guide cylinder 13 is disposed on the tightening seat 35, the guide post 34 is disposed on the left side of the tightening seat 35, a plurality of tightening hooks 321 are disposed on the right end of the tightening cylinder 32, the tightening hooks 321 extend into the tightening groove 351, a plurality of inner grooves 322 are disposed on the inner wall of the tightening cylinder 32, the upper ends of the guide posts 34 are disposed in the inner grooves 322, an outer tightening cylinder 323 is disposed on the left end of the tightening cylinder 32, and the outer tightening cylinder 323 is movably connected to the locking portion 31.

The working principle and the beneficial effects of the technical scheme are as follows: the screw motor stator 1 and the liquid guide barrel 13 are connected by the tensioning assembly 30, so that the screw motor stator 1 and the end face of the liquid guide barrel 13 can be attached more tightly, and the leakage of high-pressure drilling fluid is avoided, therefore, the embodiment provides a specific structure of the tensioning assembly 30, the tensioning assembly 30 of the structure comprises a locking part 31, a plurality of tensioning barrels 32, a plurality of guide pillars 34 and a plurality of tensioning seats 35, specifically, the locking part 31 is installed on the liquid guide barrel 13, the plurality of tensioning seats 35 and the plurality of guide pillars 34 are uniformly distributed on the screw motor stator 1, the tensioning seats 35 are provided with tensioning grooves 351 facing away from the liquid guide barrel 13, the left end of the tensioning barrel 32 is provided with an outer tensioning barrel 323, the outer tensioning barrel 323 is movably connected with the locking part 31, so that an operator rotates the locking part 31 to move the outer tensioning barrel 323 and the tensioning barrel 32 leftwards, and a plurality of tensioning hooks 321 at the right end of the tensioning barrel 32 are respectively inserted into the tensioning grooves 351 one by one, the guide post 34 is positioned on the left side of the tensioning seat 35, and the upper end of the guide post 34 is positioned in the inner strip-shaped groove 322 of the tensioning barrel 32, so that the end surfaces of the screw motor stator 1 and the liquid guide barrel 13 can be attached more tightly, and the condition that high-pressure drilling fluid leaks is avoided; meanwhile, the structure has the characteristic of simple and convenient operation.

In one embodiment, the locking portion 31 includes a locking seat ring 311, a locking nut 312, a locking sleeve 313, a pulling sleeve 314, and a plurality of braking mechanisms, the locking seat ring 311 is sleeved on the liquid guide cylinder 13, the locking nut 312 is screwed on the locking seat ring 311, a notch groove is provided on the locking nut 312, the locking sleeve 313 is rotatably disposed on the locking nut 312 and is fixedly connected with the outer pulling elastic cylinder 323, the braking mechanism includes a braking cylinder 315, a braking spring 316, and a braking mandril 317, the braking cylinder 315 is disposed on the left side of the locking seat ring 311, the braking spring 316 is disposed in the braking cylinder 315, the left end of the braking mandril 317 is located in the braking cylinder 315 and is connected with the braking spring 316, the right end of the braking mandril 317 extends into the braking groove of the locking nut 312, the pulling sleeve 314 is located outside the braking mandril 317, and is connected with the brake mandril 317 through an internal connecting rod 318, and a brake strip-shaped hole 319 corresponding to the internal connecting rod 318 is arranged on the brake cylinder 315.

The working principle and the beneficial effects of the technical scheme are as follows: the embodiment provides a specific structure of the locking portion 31, where the locking portion 31 not only plays a role of fixing the tightening assembly 30, but also has a role of self-locking to prevent circumferential loosening, the locking portion 31 includes a locking seat ring 311, a locking nut 312, a locking sleeve 313, a pulling sleeve 314, and a plurality of braking mechanisms, specifically, the locking seat ring 311 is sleeved on the liquid guide barrel 13, the locking nut 312 is screwed on the locking seat ring 311, a notch groove is provided on the locking nut 312, the locking sleeve 313 is rotatably mounted on the locking nut 312 and fixedly connected with the outer pulling cylinder 323, so that an operator rotates the locking nut 312 to move the locking nut 312 on the locking seat ring 311 to the left, and then drives the outer pulling cylinder 323 to move to the left, and then the pulling cylinder 32 fixes the screw motor stator 1 and the liquid guide barrel 13, further, the braking mechanism is located on the left side of the locking seat ring 311, the brake mechanism comprises a brake cylinder 315, a brake spring 316 and a brake ejector rod 317, wherein the brake cylinder 315 is installed on the left side of the locking seat ring 311, the brake spring 316 is installed in the brake cylinder 315, a brake strip-shaped hole 319 is formed in the brake cylinder 315, the brake ejector rod 317 is connected with the brake spring 316 in the brake cylinder 315, the pulling sleeve 314 is located on the outer side of the brake ejector rod 317 and is connected with the brake ejector rod 317 through an inner connecting rod 318, an operator can move the inner connecting rod 318 left and right through the pulling sleeve 314, and then the inner connecting rod 318 moves in the brake strip-shaped hole 319 to drive the brake ejector rod 317 to move in the brake cylinder 315, and the brake ejector rod 317 is pushed into a brake groove 3121 of the locking nut 312, so that circumferential loosening of the locking nut 312 is prevented.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

While embodiments of the invention have been disclosed above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.

Claims (10)

1. The utility model provides a big latus rectum all-metal hollow screw drilling tool driven sleeve pipe guide shoe system which characterized in that includes: the system body comprises a screw power part, a flexible connecting part, a bearing part and a sleeve guide shoe, wherein the flexible connecting part is arranged in the screw power part, the bearing part is arranged in the screw power part and is positioned at the front part of the screw power part, and the sleeve guide shoe is arranged at the front end of the screw power part.

2. The large-bore all-metal hollow screw drill driving casing guide system according to claim 1, wherein the screw power part comprises a screw motor stator (1) and a screw rotor (2), and the screw rotor (2) is arranged inside the screw motor stator (1).

3. The large-bore all-metal hollow screw drill driving casing guide shoe system according to claim 2, characterized in that an inner spiral body (101) is arranged on the inner wall of the screw motor stator (1), and an outer spiral body (201) corresponding to the inner spiral body (101) is arranged on the outer wall of the screw rotor (2).

4. The large-bore all-metal hollow screw drill driven casing guide system according to claim 2, wherein the flexible connection part comprises a large-bore flexible shaft (3), a rear end of the flexible shaft (3) is connected with a front end of the screw rotor (2), the front end of the screw rotor (2) extends into the rear end of the flexible shaft (3), and the flexible shaft (3) is provided as a slotted flexible pipe.

5. The large-bore all-metal hollow screw drill driving casing guide system according to claim 4, wherein a rupture disc (4) is arranged in the end face of the flexible shaft (3).

6. The large-bore all-metal cannulated screw drill driven casing guide system of claim 4 or 5, wherein the bearing portion comprises an inner mandrel (5), a bearing outer tube (9), two first bearings (7) and two second bearings (10), wherein a rear end of the inner mandrel (5) extends into a front end of the flexible shaft (3), the bearing outer tube (9) is sleeved on the inner mandrel (5), and a rear end of the bearing outer tube (9) extends into a front end of the screw motor stator (1), wherein one of the first bearings (7) is sleeved on the inner mandrel (5) and is located at a rear end of the bearing outer tube (9), a spacer ring (51) is disposed on the inner mandrel (5), the spacer ring (51) is located in front of a rear end of the bearing outer tube (9), wherein one of the second bearings (10) is located at a rear side of the spacer ring (51), the other first bearing (7) and the second bearing (10) are located on the front side of the baffle ring (51), and a limiting ring (11) is arranged at the front end of the inner mandrel (5).

7. The large-bore all-metal hollow screw drill driven casing guide system according to claim 7, wherein the casing guide comprises a guide body (12), the guide body (12) is arranged at the front end of the inner mandrel (5), and a plurality of liquid discharge holes (121) are arranged on the guide body (12).

8. The large-diameter all-metal hollow screw drill driven casing guide system according to claim 1, wherein the rear end of the screw motor stator (1) is connected with a liquid guide cylinder (13) through a leakage-proof assembly (20) and a tensioning assembly (30), a first internal connection cylinder (102) is arranged in the screw motor stator (1), a second internal connection cylinder (131) is arranged in the liquid guide cylinder (13), the first internal connection cylinder (102) extends into the liquid guide cylinder (13), a pre-tightening check ring (14) is arranged between the first internal connection cylinder (102) and the second internal connection cylinder (131), a circumferential groove (103) is arranged at the end part of the screw motor stator (1), the leakage-proof assembly (20) is arranged in the circumferential groove (103), and the leakage-proof assembly (20) comprises an internal spring (201), an internal stop ring body (202), A middle bone sleeve (203) and an outer anti-leakage sheet (204), the inner spring (201) is positioned at the inner bottom of the circumferential groove (103) and is propped against the inner retainer ring body (202), the middle bone sleeve (203) is positioned at the left side of the inner retainer body (202), the outer leakage-proof sheet (204) is positioned at the left side of the middle bone sleeve (203), a plurality of first locating hemispheres (205) are arranged on the outer anti-leakage sheet (204), a plurality of first positioning grooves (132) corresponding to the first positioning hemispheres (205) are arranged on the end surface of the liquid guide cylinder (13), a second positioning hemisphere (133) is arranged in the first positioning groove (132), a second positioning groove (206) corresponding to the second positioning hemisphere (133) is arranged on the first positioning hemisphere (205), the tensioning assembly (30) is used for being connected with the liquid guide cylinder (13) of the screw motor stator (1).

9. The large-diameter all-metal cannulated screw drill driven casing guide system of claim 8, wherein the tightening assembly (30) comprises a locking part (31), a plurality of tightening cylinders (32), a plurality of guide pillars (34), a plurality of tightening seats (35), the locking part (31) is arranged on the liquid guide cylinder (13), the plurality of tightening seats (35) and the plurality of guide pillars (34) are uniformly distributed on the screw motor stator (1), a tightening groove (351) facing away from the liquid guide cylinder (13) is arranged on the tightening seat (35), the guide pillar (34) is positioned at the left side of the tightening seat (35), the right end of the tightening cylinder (32) is provided with a plurality of tightening hooks (321), the tightening hooks (321) extend into the tightening groove (351), the inner wall of the tightening cylinder (32) is provided with a plurality of inner strip-shaped grooves (322), the upper end of the guide post (34) is positioned in the inner strip-shaped groove (322), the left end of the tensioning barrel (32) is provided with an outer pulling barrel (323), and the outer pulling barrel (323) is movably connected with the locking part (31).

10. The large-drift-diameter all-metal cannulated screw drill driven casing guide system of claim 8, wherein the locking portion (31) comprises a locking seat ring (311), a locking nut (312), a locking sleeve (313), a pulling sleeve (314) and a plurality of braking mechanisms, the locking seat ring (311) is sleeved on the liquid guide barrel (13), the locking nut (312) is screwed on the locking seat ring (311), a notch groove is formed in the locking nut (312), the locking sleeve (313) is rotatably arranged on the locking nut (312) and fixedly connected with the outer pulling barrel (323), each braking mechanism comprises a braking barrel (315), a braking spring (316) and a braking mandril (317), the braking barrel (315) is arranged on the left side of the locking seat ring (311), and the braking spring (316) is arranged in the braking barrel (315), the left end of the brake ejector rod (317) is located in the brake cylinder (315) and connected with the brake spring (316), the right end of the brake ejector rod (317) extends into a brake groove of the locking nut (312), the pulling sleeve (314) is located on the outer side of the brake ejector rod (317) and connected with the brake ejector rod (317) through an internal extension rod (318), and a brake strip-shaped hole (319) corresponding to the internal extension rod (318) is formed in the brake cylinder (315).

Images