Anti-deviation straight-keeping coring drilling tool

Abstract

The utility model discloses an anti-deviation straight-keeping coring drilling tool, and particularly relates to the technical field of drilling equipment, the anti-deviation straight-keeping coring drilling tool comprises a drill bit, a coring device, a lengthened reamer and a heavy weight drill rod, the drill bit is fixedly connected with one end of the coring device, the other end of the coring device is fixedly connected with one end of the lengthened reamer, and the other end of the lengthened reamer is fixedly connected with the heavy weight drill rod. One end of the lengthened reamer is fixedly connected with the drill bit, the other end of the lengthened reamer is fixedly connected with the heavy weight drill rod, the length of the lengthened reamer is 0.7-1.5 m, the outer diameter of the lengthened reamer is 0.3-0.5 mm larger than the diameter of the drill bit, the wall thickness of the heavy weight drill rod is 10-17 mm, and the outer diameter of the heavy weight drill rod is 2-4 mm smaller than the diameter of a drill hole. The utility model has a simple structure, and can effectively increase the rigidity of a drilling tool, limit and reduce the bending of a drill column, and improve the anti-deviation and straightness-keeping effects of a drill hole.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling equipment, in particular to a core drill with anti-deviation and straight hole protection functions. Background Technique

[0002] In geological exploration, drilling technology can directly take out the physical rock samples of the formation in the target area, and conduct cataloging, component analysis, and research on the rock samples. It is a direct and effective exploration technology method. Hole deviation is an important indicator to measure the quality of drilling or well-drilling engineering. During deep-hole drilling, hole deviation will increase the friction between the drill pipe and the hole wall, easily cause stuck drill accidents, which require a lot of time and effort to deal with, and may even cause damage to the drill tool, increasing the construction cost. Hole deviation may also cause the borehole to fail to reach the designed depth, and deviation correction is required. The deviation correction process is complex and requires special equipment and technologies, such as directional drilling technology, etc., which will undoubtedly prolong the construction period. Content of the Utility Model

[0003] The purpose of the utility model is to provide a core drill with anti-deviation and straight hole protection functions to solve the problems existing in the above-mentioned prior art. The structure is simple, which can effectively increase the stiffness of the drill tool, limit and reduce the bending of the drill string, and improve the anti-deviation and straight hole protection effect of the borehole.

[0004] To achieve the above purpose, the utility model provides the following scheme:

[0005] The utility model provides a core drill with anti-deviation and straight hole protection functions, including a drill bit, a core-taking device, an extended reamer, and a heavy drill pipe. One end of the drill bit is fixedly connected to one end of the core-taking device, the other end of the core-taking device is fixedly connected to one end of the extended reamer, the other end of the extended reamer is fixedly connected to the heavy drill pipe. The length of the extended reamer is 0.7 - 1.5 m, the outer diameter of the extended reamer is 0.3 - 0.5 mm larger than the diameter of the drill bit, the wall thickness of the heavy drill pipe is 10 - 17 mm, and the outer diameter of the heavy drill pipe is 2 - 4 mm smaller than the diameter of the borehole.

[0006] Preferably, the core-taking device includes an outer pipe, an inner pipe assembly, and a core barrel. The core barrel is fixedly connected to the inner pipe assembly, the outer pipe is fixedly sleeved outside the inner pipe assembly and the core barrel. One end of the outer pipe is fixedly connected to the drill bit, and the other end of the outer pipe is fixedly connected to the extended reamer.

[0007] Preferably, the outer side surface of the heavy drill pipe has a plurality of helical grooves with a certain helix angle.

[0008] Preferably, the number of the helical grooves is 2 - 4.

[0009] Preferably, one end of the outer pipe is threadedly connected to the drill bit, and the other end of the outer pipe is threadedly connected to the extended reamer.

[0010] Preferably, the extended reamer is threadedly connected to the heavy drill pipe.

[0011] Preferably, the number of the heavy drill pipes is multiple, and the number of the extended reamers is multiple. The multiple extended reamers and the heavy drill pipes are connected at intervals in sequence, and the extended reamer close to the bottom of the hole is connected to the coring device.

[0012] The utility model has achieved the following technical effects compared with the prior art:

[0013] The utility model provides an anti-deviation and straightness-preserving coring drill tool. The wall thickness of the heavy drill pipe is 10-17 mm, which is 2-3 times that of the standard wireline coring drill pipe. The heavy drill pipe has strong stiffness, can limit and reduce the bending of the drill string, effectively reduce the well deviation. At the same time, the heavy drill pipe has a large weight and can increase the drilling pressure on the drill bit like a drill collar, improving the drilling efficiency. Moreover, the outer diameter of the heavy drill pipe 4 is 2-4 mm smaller than the borehole diameter, and the difference between the outer diameter of the heavy drill pipe and the borehole diameter is small, which can play the role of a stabilizer. The outer diameter of the extended reamer is 0.3-0.5 mm larger than the drill bit diameter, which can realize the function of reaming, ensure the drill pipe is centered, and reduce the occurrence of eccentric wear. The length of the extended reamer is 0.7-1.5 m, which is 3-4 times that of the ordinary reamer. It not only has a better reaming effect, but also the longer extended reamer can play the role of a centralizer, can support the borehole wall, limit the lateral movement of the drill bit, and can better control the verticality of the borehole. Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0015] Figure 1 It is a structural schematic diagram of the anti-deviation and straightness-preserving coring drill tool.

[0016] In the figure: 1 - drill bit; 2 - coring device; 21 - outer pipe; 22 - inner pipe assembly; 23 - core barrel; 3 - extended reamer; 4 - heavy drill pipe; 41 - spiral groove. Detailed Embodiments

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] The purpose of the present invention is to provide a core drilling tool for preventing deviation and maintaining straightness to solve the problems existing in the above-mentioned prior art. It has a simple structure, can effectively increase the stiffness of the drilling tool, limit and reduce the bending of the drill string, and improve the anti-deviation and straightness-maintaining effect of the drilling hole.

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] The present invention provides a core drilling tool for preventing deviation and maintaining straightness, as Figure 1 shown, which includes a drill bit 1, a core device 2, an extended reamer 3 and a heavy drill pipe 4. One end of the drill bit 1 is fixedly connected to one end of the core device 2, the other end of the core device 2 is fixedly connected to one end of the extended reamer 3, and the other end of the extended reamer 3 is fixedly connected to the heavy drill pipe 4. The length of the extended reamer 3 is 0.7 - 1.5 m, the outer diameter of the extended reamer 3 is 0.3 - 0.5 mm larger than the diameter of the drill bit, the wall thickness of the heavy drill pipe 4 is 10 - 17 mm, and the outer diameter of the heavy drill pipe 4 is 2 - 4 mm smaller than the diameter of the drilling hole. The wall thickness of the heavy drill pipe 4 is 10 - 17 mm, which is 2 - 3 times that of the standard wireline coring drill pipe. The heavy drill pipe 4 has strong stiffness, can limit and reduce the bending of the drill string, effectively reduce the well deviation. At the same time, the heavy drill pipe 4 has a large weight and can increase the drilling pressure on the drill bit 1 like a drill collar, improving the drilling efficiency. Moreover, the outer diameter of the heavy drill pipe 4 is 2 - 4 mm smaller than the diameter of the drilling hole, and the difference between the outer diameter of the heavy drill pipe 4 and the diameter of the drilling hole is small, which can play the role of a stabilizer. The extended reamer 3 is installed between the heavy drill pipe 4 and the core device 2, and the outer diameter of the extended reamer 3 is 0.3 - 0.5 mm larger than the diameter of the drill bit. When the drill bit 1 drills forward, the extended reamer 3 can perform rotary cutting on the wall of the drilling hole to achieve the function of reaming, ensure that the drill pipe is centered, reduce the occurrence of eccentric wear, and prevent the drill string from bending due to the hole wall, resulting in well deviation. The length of the extended reamer 3 is 0.7 - 1.5 m, which is 3 - 4 times that of an ordinary reamer. Not only does it have a better reaming effect, but the longer extended reamer 3 can play the role of a centralizer, support the wall of the drilling hole, limit the lateral movement of the drill bit 1, and can better control the verticality of the drilling hole.

[0021] In a further preferred embodiment of the present utility model, the coring device 2 includes an outer pipe 21, an inner pipe assembly 22, and a core barrel 23. The core barrel 23 is fixedly connected to the inner pipe assembly 22. The outer pipe 21 is fixedly sleeved outside the inner pipe assembly 22 and the core barrel 23. One end of the outer pipe 21 is fixedly connected to the drill bit 1, and the other end of the outer pipe 21 is fixedly connected to the extended reamer 3. The anti-deviation and straightness-preserving coring drill tool uses the wire-line coring technology to obtain the core. During the drilling process, the core enters the core barrel 23 through the drill bit 1. When the core barrel 23 is filled with the core, the entire inner pipe assembly 22 is lifted to the hole mouth with the aid of a special fishing tool to obtain the core, thereby reducing the number of trips and the auxiliary time for raising and lowering the drill tool, and improving the drilling efficiency. Connecting the heavy drill pipe 4 and the extended reamer 3 in sequence above the outer pipe 21 enables the inner pipe assembly 22 to pass smoothly through the central hole. During the coring process, the core enters the core barrel 23. The weight of the heavy drill pipe 4 mainly applies the drilling pressure to the drill bit 1, which can reduce the bending of the drill string.

[0022] In a further preferred embodiment of the present utility model, the outer side surface of the heavy drill pipe 4 has a plurality of spiral grooves 41 with a certain spiral lift angle, and the number of the spiral grooves 41 is 2 - 4. The spiral grooves 41 can not only discharge the cuttings and rock powder, reduce the friction between the heavy drill pipe 4 and the borehole wall, but also timely take away the heat generated on the surface of the heavy drill pipe 4 to achieve heat dissipation.

[0023] In a further preferred embodiment of the present utility model, one end of the outer pipe 21 is threadedly connected to the drill bit 1, the other end of the outer pipe 21 is threadedly connected to the extended reamer 3, and the extended reamer 3 is threadedly connected to the heavy drill pipe 4.

[0024] In a further preferred embodiment of the present utility model, the number of the heavy drill pipes 4 is multiple, and the number of the extended reamers 3 is multiple. The multiple extended reamers 3 and heavy drill pipes 4 are connected at intervals in sequence, and the extended reamer 3 closest to the bottom of the hole is connected to the coring device 2. When the formation dip angle is large, the number of the heavy drill pipes 4 and the extended reamers 3 can be increased, and the positions of the heavy drill pipes 4 and the extended reamers 3 close to the bottom of the hole can effectively increase the stiffness of the drill tool, reduce the bending of the drill tool, and ensure the anti-deviation and straightness-preserving effect of high-precision drilling.

[0025] Specific examples are used in the present utility model to elaborate on the principle and implementation mode of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those of ordinary skill in the art, based on the idea of the present utility model, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A deviation prevention and straight hole maintaining core drill tool, characterized in that: It includes a drill bit, a core sampling device, an extended reamer and a heavy drill pipe. One end of the drill bit is fixedly connected to one end of the core sampling device. The other end of the core sampling device is fixedly connected to one end of the extended reamer. The other end of the extended reamer is fixedly connected to the heavy drill pipe. The length of the extended reamer is 0.7 - 1.5 m. The outer diameter of the extended reamer is 0.3 - 0.5 mm larger than the diameter of the drill bit. The wall thickness of the heavy drill pipe is 10 - 17 mm. The outer diameter of the heavy drill pipe is 2 - 4 mm smaller than the diameter of the borehole.

2. The anti-deviation and straight-hole coring drill tool according to claim 1, wherein: The core sampling device includes an outer pipe, an inner pipe assembly and a core barrel. The core barrel is fixedly connected to the inner pipe assembly. The outer pipe is fixedly sleeved outside the inner pipe assembly and the core barrel. One end of the outer pipe is fixedly connected to the drill bit. The other end of the outer pipe is fixedly connected to the extended reamer.

3. The anti-deviation and straight-hole coring drill tool according to claim 1, characterized in that: The outer side surface of the heavy drill pipe has a plurality of helical grooves with a certain helix angle.

4. The anti-deviation and straight-hole coring drill tool according to claim 3, wherein: The number of the helical grooves is 2 - 4.

5. The anti-deviation and straight-hole coring drill tool according to claim 2, wherein: One end of the outer pipe is threadedly connected to the drill bit. The other end of the outer pipe is threadedly connected to the extended reamer.

6. The anti-deviation and straight-hole coring drill tool according to claim 5, characterized in that: The extended reamer is threadedly connected to the heavy drill pipe.

7. The anti-deviation and straight-hole coring drill tool according to claim 1, wherein: The number of the heavy drill pipes is multiple. The number of the extended reamers is multiple. The multiple extended reamers and the heavy drill pipes are connected at intervals in sequence. And the extended reamer close to the bottom of the hole is connected to the core sampling device.

Images