An external-rotor hollow core drill tool

Abstract

The present invention discloses an outer rotor hollow coring screw drill tool, which relates to the technical field of drilling tools and includes: an upper joint, the upper end of which can be used to connect to an upper drill pipe; a transmission shaft joint, the upper end of which is connected to the lower end of the upper joint, and a mud flow channel is provided on the side wall of the transmission shaft joint; an integrated stator, the upper end of which is fixed to the lower end of the transmission shaft joint, and an outer spiral structure is provided on the outer side wall of the integrated stator; an outer rotor body, the outer rotor body is rotatably connected to the outer side of the integrated stator, a gap flow channel is provided between the outer rotor body and the integrated stator, an inner spiral structure is provided on the inner wall of the outer rotor body, the outer spiral structure meshes with the inner spiral structure, and the lower end of the outer rotor body can be used to connect to a coring drill bit; the upper joint, the transmission shaft joint, and the integrated stator all have a central channel. The center of the present invention has a central channel, which facilitates the use of rope coring.

Description

Technical Field

[0001] The invention relates to the technical field of drilling tools, in particular to an outer rotor hollow coring screw drilling tool. Background Art

[0002] With the development of marine geology and the exploration of oil and gas resources, the demand for marine coring is increasing. Wireline coring drilling is a geological exploration drilling method in which a drill assembly is inserted into the drill pipe. After the coring operation is completed, the assembly is retrieved from the surface using a wireline reel. This greatly improves work efficiency because the coring process does not require the drill pipe, which is hundreds or thousands of meters long, to be brought to the surface.

[0003] Conventional rope coring drilling methods use an outer assembly consisting of an outer tube connected to a rope drill rod, and an inner assembly including an inner tube, a retaining spring, and a single-action suspension assembly. The drill rod and drill bit are driven by surface rotational power to break rock.

[0004] However, conventional downhole power drilling tools are solid structures and cannot be cored using ropes. As a result, the entire drilling tool needs to be pulled out every time coring is performed, which wastes time and leads to high construction costs.

[0005] Therefore, the market is in urgent need of an outer rotor hollow coring screw drill to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to provide an outer rotor hollow coring screw drill tool for solving the technical problems existing in the above-mentioned prior art. The overall structure is hollow and can be installed with a coring drill tool to facilitate rope coring.

[0007] To achieve the above object, the present invention provides the following solutions:

[0008] The present invention discloses an outer rotor hollow coring screw drill tool, comprising:

[0009] An upper joint, the upper end of which can be used to connect to the upper drill pipe;

[0010] A transmission shaft joint, the upper end of which is connected to the lower end of the upper joint, and a mud flow channel is provided on the side wall of the transmission shaft joint;

[0011] an integrated stator, the upper end of which is fixed to the lower end of the transmission shaft joint, and an outer side wall of which is provided with an external spiral structure;

[0012] an outer rotor body, the outer rotor body being rotatably connected to the outer side of the integrated stator, a gap flow channel being provided between the outer rotor body and the integrated stator, an inner spiral structure being provided on the inner wall of the outer rotor body, the outer spiral structure being meshed with the inner spiral structure, and a lower end of the outer rotor body being capable of being connected to a coring drill bit;

[0013] The upper joint, the transmission shaft joint, and the integrated stator all have a central channel.

[0014] Preferably, the outer rotor body comprises an outer rotor upper shell, an outer rotor middle shell and an outer rotor lower shell, and the outer rotor upper shell and the outer rotor lower shell are respectively arranged at the upper and lower ends of the outer rotor middle shell;

[0015] The outer rotor upper housing is located outside the mud flow channel;

[0016] The inner spiral structure is provided on the outer rotor middle shell;

[0017] The outer rotor lower shell is provided with a drill bit connecting thread, and the drill bit connecting thread is used to connect with a core drill bit.

[0018] Preferably, the lower end of the outer rotor upper shell is connected to the upper end of the outer rotor middle shell through an upper universal torque transmission short section, and the lower end of the outer rotor middle shell is connected to the upper end of the outer rotor lower shell through a lower universal torque transmission short section.

[0019] Preferably, the upper universal torque transmission short section and the lower universal torque transmission short section have the same structure;

[0020] The lower universal torque transmission short joint includes an upper connecting head, an upper block, an upper center block, a lower block, a lower center block and a lower connecting head. The upper end of the upper connecting head is used to be connected to the lower end of the outer rotor middle shell, and the lower end of the lower connecting head is used to be connected to the upper end of the outer rotor lower shell. The lower end of the upper connecting head and the upper end of the lower connecting head are both provided with arcuate surfaces. The upper center block contacts the arcuate surface of the upper connecting head, and the lower center block contacts the arcuate surface of the lower connecting head. The upper block is fixed to the lower end of the upper connecting head, the upper block is located on the outside of the upper center block, the lower block is fixed to the upper end of the lower connecting head, the lower block is located on the outside of the lower center block, and the upper block and the lower block are connected by a vulcanized sealing rubber.

[0021] Preferably, an upper sealing ring is provided between the upper center stop and the upper connector;

[0022] A lower sealing ring is provided between the lower center stop and the lower connecting head.

[0023] Preferably, an upward twist key is provided between the upper center stop and the upper stop, and a downward twist key is provided between the lower center stop and the lower stop;

[0024] The uplink twist key and the downlink twist key are both spherical parts.

[0025] Preferably, an upper TC bearing, a thrust bearing and a middle TC bearing are provided between the transmission shaft joint and the outer rotor body, and the upper TC bearing and the middle TC bearing are fixed to the upper and lower ends of the thrust bearing respectively.

[0026] Preferably, a lower TC bearing is provided between the lower end of the outer rotor body and the lower end of the integrated stator.

[0027] Preferably, a groove is provided on the inner wall of the upper end of the transmission shaft joint.

[0028] Preferably, a sealing ring is provided on the inner wall of the upper end of the one-piece body.

[0029] Compared with the prior art, the present invention has achieved the following technical effects:

[0030] The interior of the present invention is a hollow structure, which can meet the requirements of the installation, seating and sealing of the coring drill, ensuring the safety of the rope coring operation;

[0031] Furthermore, the present invention has an integrated stator as the stator structure inside and an outer rotor body as the rotor structure outside, which is different from the traditional outer stator inner rotor structure and has a novel structure.

[0032] Furthermore, the upper universal torque transmission sub and the lower universal torque transmission sub can eliminate the disturbance of the coring operation of the lower coring drill bit caused by the vibration of the outer rotor body during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 This is a schematic structural diagram of an outer rotor hollow coring screw drill tool assembled with a coring drill tool and a coring drill bit according to an embodiment of the present invention;

[0035] Figure 2 This is a schematic structural diagram of an outer rotor hollow coring screw drill according to an embodiment of the present invention;

[0036] Figure 3 This is an enlarged view of the upper connection portion of the outer rotor hollow coring screw drill according to an embodiment of the present invention;

[0037] Figure 4 This is an enlarged view of the middle portion of the outer rotor hollow coring screw drill according to an embodiment of the present invention;

[0038] Figure 5 This is an enlarged view of the lower connection portion of the outer rotor hollow coring screw drill according to an embodiment of the present invention;

[0039] Figure 6 Schematic diagram of the structure of the lower universal torque transmission sub in the outer rotor hollow coring screw drill according to an embodiment of the present invention;

[0040] Figure 7 A cross-sectional view of a lower universal torque transmission sub in an outer rotor hollow coring screw drill according to an embodiment of the present invention;

[0041] In the figure: 1-coring drill; 2-outer rotor hollow coring screw drill; 201-upper joint, 202-drive shaft joint, 2021-groove; 2022-mud flow channel; 203-upper TC bearing, 204-thrust bearing, 205-middle TC bearing, 206-outer rotor upper housing, 207-integrated stator, 2071-sealing ring; 208-upper universal torque transmission nipple, 209-outer rotor middle housing, 210-lower universal torque transmission Pup joint, 2101-upper connector; 2102-upper center stop; 2103-upper stop; 2104-upper sealing ring; 2105-upper torsion key; 2106-vulcanized sealing rubber; 2107-lower connector; 2108-lower center stop; 2109-lower stop; 21010-lower sealing ring; 21011-lower torsion key; 211-lower TC bearing, 212-outer rotor lower housing; 213-drill bit connecting thread; 3-coring drill bit. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0043] The purpose of the present invention is to provide an outer rotor hollow coring screw drill tool for solving the technical problems existing in the above-mentioned prior art. The overall structure is hollow and can be installed with a coring drill tool to facilitate rope coring.

[0044] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] like Figure 1-Figure 7As shown, this embodiment provides an outer rotor hollow coring screw drill 2, comprising:

[0046] The upper connector 201 has an internal thread at its upper end, which can be used for threaded connection with the upper drill pipe;

[0047] The transmission shaft joint 202 has an internal thread on the upper end of the transmission shaft, and an external thread on the lower end of the upper joint 201. The upper end of the transmission shaft joint 202 is threadedly connected to the lower end of the upper joint 201. A mud flow channel 2022 is provided on the side wall of the transmission shaft joint 202. There are multiple mud flow channels 2022, which can be two or more. The multiple mud flow channels 2022 are located at the same height.

[0048] An integrated stator 207, the upper end of which is fixed to the lower end of the transmission shaft joint 202, and an outer spiral structure is provided on the outer side wall of the integrated stator 207;

[0049] The outer rotor body is rotatably connected to the outer side of the integrated stator 207. In addition, the upper end of the outer rotor body is partially disposed outside the lower portion of the drive shaft joint 202. A gap flow channel is provided between the outer rotor body and the integrated stator 207 to facilitate the flow of mud. The inner wall of the outer rotor body is provided with an inner spiral structure, and the outer spiral structure meshes with the inner spiral structure. The lower end of the outer rotor body has a drill bit connection thread 213, which can be used to connect to the core drill bit 3;

[0050] The upper joint 201 , the transmission shaft joint 202 , and the integrated stator 207 all have a central channel. The lower end of the outer rotor body is also provided with a central channel, and the central channels are interconnected.

[0051] In actual use, since a central channel is provided in the middle of each structure, the whole is a hollow structure, which can realize the installation of coring drill tools and facilitate the implementation of rope coring operations.

[0052] When mud flows into the central channel of upper joint 201, it passes through mud flow channel 2022 and then flows into the gap flow channel. When the mud passes between the outer spiral structure and the inner thread structure, the hydraulic pressure is converted into mechanical power by the inner spiral structure, thereby driving the outer rotor body to rotate. The mud eventually flows out of the central channel at the lower end of the outer rotor body.

[0053] In this embodiment, the outer rotor body includes an outer rotor upper shell 206, an outer rotor middle shell 209 and an outer rotor lower shell 212. The outer rotor upper shell 206 and the outer rotor lower shell 212 are respectively disposed at the upper and lower ends of the outer rotor middle shell 209;

[0054] Among them, Figure 3As shown, the outer rotor upper housing 206 is located outside the mud flow channel 2022, specifically outside part of the drive shaft joint 202 and the integrated stator 207;

[0055] like Figure 4 As shown, an inner spiral structure is provided on the outer rotor middle housing 209;

[0056] like Figure 5 As shown, a drill bit connecting thread 213 is provided at the lower end of the outer rotor lower shell 212, and the drill bit connecting thread 213 is used to connect the core drill bit 3.

[0057] In this embodiment, the lower end of the outer rotor upper housing 206 is connected to the upper end of the outer rotor middle housing 209 via an upper universal torque transmission nipple 208, while the lower end of the outer rotor middle housing 209 is connected to the upper end of the outer rotor lower housing 212 via a lower universal torque transmission nipple 210. The purpose of the upper universal torque transmission nipple 208 and the lower universal torque transmission nipple 210 connection is to achieve torque transmission while also accommodating possible angular bending of the outer rotor body.

[0058] In this embodiment, if Figure 6 and Figure 7 As shown, the structures of the upper universal torque transmission short section 208 and the lower universal torque transmission short section 210 are the same. The following description will only take the lower universal torque transmission short section 210 as an example. The upper universal torque transmission short section 208 is the same as the lower universal torque transmission short section 210, so no further details will be given.

[0059] Lower universal torque transmission joint 210 includes an upper connector 2101, an upper stop 2103, an upper center stop 2102, a lower stop 2109, a lower center stop 2108, and a lower connector 2107. The upper end of upper connector 2101 is connected to the lower end of outer rotor middle housing 209, while the lower end of lower connector 2107 is connected to the upper end of outer rotor lower housing 212. Both the lower end of upper connector 2101 and the upper end of lower connector 2107 are provided with curved surfaces. Upper center stop 2102 contacts the curved surfaces of upper connector 2101, while lower center stop 2108 contacts the curved surfaces of lower connector 2107. The upper end of upper center stop 2102 and the lower end of lower center stop 2108 are provided with curved heads for contacting and sliding with the curved surfaces. Upper stopper 2103 is fixed to the lower end of upper connector 2101 and positioned outside upper center stopper 2102. Lower stopper 2109 is fixed to the upper end of lower connector 2107 and positioned outside lower center stopper 2108. Upper and lower stops 2103 and 2109 are vulcanized and connected by a vulcanized sealant 2106 to prevent the intrusion of mud and sand into the gap. In actual use, when the outer rotor lower housing 212 rotates at a certain angle, it drives lower connector 2107 and lower stopper 2109 to rotate together. The upper connector 2101, upper stopper 2103, upper center stopper 2102, and lower center stopper 2108 remain stable and can still transmit torque.

[0060] In this embodiment, an upper sealing ring 2104 is provided between the upper center stop 2102 and the upper connector 2101 , and corresponding mounting grooves are provided between the upper center stop 2102 and the upper connector 2101 , thereby improving the sealing between the upper center stop 2102 and the upper connector 2101 ;

[0061] Similarly, a lower sealing ring 21010 is provided between the lower center block 2108 and the lower connecting head 2107, and a corresponding installation groove is provided between the lower center block 2108 and the lower connecting head 2107. The upper sealing ring 2104 and the lower sealing ring 21010 can both be O-rings commonly found on the market.

[0062] In this embodiment, an upload twist key 2105 is provided between the upper center block 2102 and the upper block 2103, and a corresponding key slot is provided between the upper center block 2102 and the upper block 2103, thereby realizing a key connection between the upper center block 2102 and the upper block 2103. When the upper block 2103 rotates, the upper center block 2102 is driven to rotate synchronously. Similarly, a down-transmission twist key 21011 is provided between the lower center block 2108 and the lower block 2109, and a corresponding key slot is also provided between the lower center block 2108 and the lower block 2109.

[0063] Specifically, the upper transmission twist key 2105 and the lower transmission twist key 21011 are both spherical parts, forming a ball hinge, so as to achieve the technical effect that the upper block 2103 and the upper center block 2102 or the lower block 2109 and the lower center block 2108 can rotate relative to each other and can also transmit torque.

[0064] In this embodiment, if Figure 3 As shown, an upper TC bearing 203, a thrust bearing 204, and a middle TC bearing 205 are disposed between the drive shaft joint 202 and the outer rotor body (specifically, the upper end of the outer rotor upper housing 206). The upper TC bearing 203 and the middle TC bearing 205 are respectively fixed to the upper and lower ends of the thrust bearing 204. The upper TC bearing 203 and the middle TC bearing 205 are conventional carbide radial bearings. In this embodiment, they provide centering and lubrication, ensuring that the outer rotor upper housing 206 remains centered and free of deviation during rotation, while also enabling smooth rotation of the outer rotor upper housing 206. The thrust bearing 204, on the other hand, transmits the pressure transmitted sequentially from the upper joint 201, the drive shaft joint 202, and the upper TC bearing 203 downwardly to the middle TC bearing 205. The middle TC bearing 205 then transmits the pressure to the outer rotor body, thereby achieving pressure transmission.

[0065] It should be additionally explained here that a step portion is provided at the upper end of the outer rotor upper housing 206. The outer diameter of the middle TC bearing 205 is the same as the inner diameter of the step portion and is installed on the step portion, so the middle TC bearing 205 can transfer pressure vertically downward to the step portion of the outer rotor upper housing 206.

[0066] In this embodiment, a lower TC bearing 211 is provided between the lower end of the outer rotor body and the lower end of the integrated stator 207. Its function is the same as that of the middle TC bearing 205, which is to straighten and lubricate the outer rotor body.

[0067] In this embodiment, a groove 2021 is provided on the inner wall of the upper end of the transmission shaft joint 202. The groove 2021 here is also a step structure, and its function is to provide a step area for the internal core drilling tool 1 to sit and clamp.

[0068] In this embodiment, a sealing ring 2071 is mounted on the inner wall of the upper end of the integrated stator 207. The sealing ring 2071 is installed at the threaded connection between the integrated stator 207 and the drive shaft connector 202. When the coring drill 1 is installed and seated, the sealing plate of the coring drill 1 cooperates with the sealing ring 2071 to provide a seal.

[0069] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. An outer rotor hollow coring screw drill, characterized in that: include: An upper joint, the upper end of which can be used to connect to the upper drill pipe; A transmission shaft joint, the upper end of which is connected to the lower end of the upper joint, and a mud flow channel is provided on the side wall of the transmission shaft joint; an integrated stator, the upper end of which is fixed to the lower end of the transmission shaft joint, and an outer side wall of which is provided with an external spiral structure; an outer rotor body, the outer rotor body being rotatably connected to the outer side of the integrated stator, a gap flow channel being provided between the outer rotor body and the integrated stator, an inner spiral structure being provided on the inner wall of the outer rotor body, the outer spiral structure being meshed with the inner spiral structure, and a lower end of the outer rotor body being capable of being connected to a coring drill bit; The upper joint, the transmission shaft joint and the integrated stator all have a central channel; The outer rotor body includes an outer rotor upper shell, an outer rotor middle shell and an outer rotor lower shell, wherein the outer rotor upper shell and the outer rotor lower shell are respectively arranged at the upper and lower ends of the outer rotor middle shell; the outer rotor upper shell is located outside the mud flow channel; the outer rotor middle shell is provided with the inner spiral structure; the outer rotor lower shell is provided with a drill bit connecting thread, and the drill bit connecting thread is used to connect with the core drill bit; The lower end of the outer rotor upper shell is connected to the upper end of the outer rotor middle shell through an upper universal torque transmission short section, and the lower end of the outer rotor middle shell is connected to the upper end of the outer rotor lower shell through a lower universal torque transmission short section; The upper universal torque transmission short joint and the lower universal torque transmission short joint have the same structure; the lower universal torque transmission short joint includes an upper connecting head, an upper block, an upper center block, a lower block, a lower center block and a lower connecting head, the upper end of the upper connecting head is used to be connected to the lower end of the outer rotor middle shell, and the lower end of the lower connecting head is used to be connected to the upper end of the outer rotor lower shell, the lower end of the upper connecting head and the upper end of the lower connecting head are both provided with an arc surface, the upper center block contacts the arc surface of the upper connecting head, and the lower center block contacts the arc surface of the lower connecting head, the upper block is fixed to the lower end of the upper connecting head, the upper block is located on the outside of the upper center block, the lower block is fixed to the upper end of the lower connecting head, the lower block is located on the outside of the lower center block, and the upper block and the lower block are connected by a vulcanized sealing rubber.

2. The outer rotor hollow coring screw drill according to claim 1, characterized in that: An upper sealing ring is provided between the upper center stop and the upper connector; A lower sealing ring is provided between the lower center stop and the lower connecting head.

3. The outer rotor hollow coring screw drill according to claim 1, characterized in that: An up-transmission twist key is provided between the upper center block and the upper block, and a down-transmission twist key is provided between the lower center block and the lower block; The uplink twist key and the downlink twist key are both spherical parts.

4. The outer rotor hollow coring screw drill according to claim 1, characterized in that: An upper TC bearing, a thrust bearing and a middle TC bearing are provided between the transmission shaft joint and the outer rotor body. The upper TC bearing and the middle TC bearing are respectively fixed to the upper and lower ends of the thrust bearing.

5. The outer rotor hollow coring screw drill according to claim 1, characterized in that: A lower TC bearing is provided between the lower end of the outer rotor body and the lower end of the integrated stator.

6. The outer rotor hollow coring screw drill according to claim 1, characterized in that: A groove is provided on the inner wall of the upper end of the transmission shaft joint.

7. The outer rotor hollow coring screw drill according to claim 1, characterized in that: A sealing ring is provided on the inner wall of the upper end of the integrated stator.

Images