A drill bit and borehole coring apparatus

Abstract

The drilling head disclosed by the embodiment of the present application comprises a body, the body is provided with a drilling hole, the inner wall of the body is sequentially provided with a first limiting part and an elastic deformation part along the direction of the stratum rock sample entering the drilling head, a pushing piece is arranged in the drilling hole, the pushing piece comprises an acting part and a driving part connected with the acting part, a sleeve body is arranged in the drilling hole, one end of the sleeve body abuts against the acting part between the first limiting part, and the other end of the sleeve body is arranged in the gap; in this way, when the rock core enters the sleeve body during use, the driving part is extruded, the sleeve body is moved towards the gap through the acting part, and the elastic deformation part is extruded, so that the elastic deformation part is inclined towards the middle part of the drilling hole, the deformation of the elastic deformation part is used to realize the shrinkage clamping of the root of the rock core, and the success rate of capturing and obtaining the rock core is improved.

Description

Technical Field

[0001] This application belongs to the field of oil well logging instrument technology, and in particular relates to a drill bit and wellbore coring instrument. Background Technology

[0002] Borehole coring is used to confirm the lithology, oil-bearing properties, and the relationship between lithology and electrical properties of formations. Currently, there are several main methods of downhole coring, including drilling coring, percussion coring, and rotary wellbore coring. Among them, rotary wellbore coring has the advantages of simple construction and low cost. However, in actual use, due to differences in formation hardness, density, and fragility, the drill bit in rotary wellbore coring, as the actuating component of the coring action, often fails to hold and fix the formation rock sample in soft or fragile formations, resulting in a low coring success rate. Summary of the Invention

[0003] This application aims to at least partially solve the technical problem of low success rate of drill bits in the coring process. To this end, this application provides a drill bit and a wellbore coring instrument.

[0004] This invention provides a drill bit, comprising: a body having a drill hole, and a first limiting part and an elastic deformation member sequentially arranged on the inner wall of the body along the direction in which the rock sample enters the drill bit; wherein, there is a gap between the elastic deformation member and the inner wall of the drill hole;

[0005] An advance member is disposed within the borehole. The advance member includes an action part and a drive part connected to the action part, wherein the distance between the drive part and the center line of the borehole is less than the distance between the action part and the center line of the borehole.

[0006] A sleeve is disposed within the drilled hole; one end of the sleeve abuts against the first limiting portion via the actuating portion, and the other end of the sleeve is disposed within the gap; wherein...

[0007] The driving unit is pushed by the force of the rock sample entering the casing to continue moving the casing into the gap, so as to compress the elastic deformation member to tilt towards the center line of the borehole.

[0008] In this embodiment of the invention, a through hole is formed on the side wall of the sleeve, and the through hole extends through both ends of the sleeve along the axial direction of the sleeve.

[0009] In this embodiment of the invention, the inner wall of the inner cavity of the sleeve is provided with a protrusion.

[0010] In this embodiment of the invention, the body includes:

[0011] The drill body, wherein the drill hole is formed on the drill body;

[0012] The drill bit body is detachably and fixedly sleeved on the drill hole, and the elastic deformation member is disposed in the drill hole by being connected to the drill bit body.

[0013] In an embodiment of the present invention, the elastic deformation member includes a plurality of elastic sheets, which are distributed circumferentially along the inner wall of the borehole.

[0014] In this embodiment of the invention, a stop is provided inside the borehole, the stop having a degree of freedom to move along the direction in which the formation rock sample enters the borehole, and the stop comprising:

[0015] The first working surface is disposed on one side of the stop and is positioned opposite to the opening of the drilled hole;

[0016] The second working surface is disposed on the other side of the stop relative to the first working surface and abuts against the driving part.

[0017] In this embodiment of the invention, the propulsion component is a lever component;

[0018] A second limiting part is also provided on the inner wall of the borehole, and the second limiting part is located behind the first limiting part along the direction in which the stratum rock sample enters the borehole;

[0019] The stop is provided with a third working surface, which is located on the front and rear sides of the second limiting part along the direction in which the stratum rock sample enters the borehole, and a gap is provided between the third working surface and the second limiting part.

[0020] In an embodiment of the present invention, an opening is formed on the inner wall of the main body where a drill hole is provided, which connects to the outside. The second limiting part is disposed in the drill hole by being detachably and fixedly inserted into the opening.

[0021] The third working surface is sleeved on the outside of the second limiting part.

[0022] In this embodiment of the invention, the functional part is an arc-shaped spring sheet with its opening facing the gap;

[0023] The driving part is an arc-shaped spring sheet with an opening facing away from the gap; the bottom of the opening of the driving part;

[0024] One end of the side wall of the functional part abuts against the sleeve, the arc-shaped part of the functional part abuts against the first limiting part, the other end of the side wall of the functional part is connected to one side wall of the driving part, and the arc-shaped part of the driving part abuts against the stop.

[0025] The actuating part and the driving part are connected and form a spring sheet with an S-shaped cross-section.

[0026] This invention provides a wellbore coring instrument, including the drill bit described in the above-described embodiments.

[0027] This invention provides a drill bit comprising: a body having a drill hole, the inner wall of the body being sequentially provided with a first limiting part and an elastic deformation member along the direction in which a formation rock sample enters the drill bit; wherein, there is a gap between the elastic deformation member and the inner wall of the drill hole; a propulsion member disposed within the drill hole, the propulsion member comprising an action part and a driving part connected to the action part, wherein the distance between the driving part and the center line of the drill hole is less than the distance between the action part and the center line of the drill hole; and a sleeve disposed within the drill hole; one end of the sleeve abuts against the first limiting part through the action part, and the other end of the sleeve is disposed within the gap. The driving unit, under the force of the formation rock sample entering the casing, pushes the casing to continue moving into the gap, thereby squeezing the elastic deformation member and tilting it towards the center line of the borehole. This embodiment of the invention provides a wellbore coring instrument, including a drill bit. In use, when the core enters the casing, the driving unit is squeezed, and the driving unit moves the casing into the gap, squeezing the elastic deformation member and causing it to tilt towards the center of the borehole. This deformation of the elastic deformation member achieves contraction and clamping of the core's root, thereby improving the success rate of core capture. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of a drill bit provided in an embodiment of the present invention;

[0030] Figure 2 A schematic perspective view of the sleeve structure provided in an embodiment of the present invention;

[0031] Figure 3 This is a schematic cross-sectional view of the sleeve provided in an embodiment of the present invention.

[0032] Figure label:

[0033] 1. Body; 11. Drill body; 12. Drill bit body; 2. Drill hole; 21. Hole opening; 22. Opening; 3. First limiting part; 4. Elastic deformation part; 41. Gap; 5. Propulsion part; 51. Actuating part; 52. Driving part; 6. Sleeve; 61. Through hole; 62. Protrusion; 7. Stop; 71. First acting surface; 72. Second acting surface; 73. Third acting surface; 8. Second limiting part. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0035] Furthermore, reference numerals and / or reference letters may be repeated in different examples in this application. Such repetition is for simplification and clarity purposes and does not in itself indicate a relationship between the various embodiments and / or settings discussed. In addition, this application provides examples of various specific processes and materials; however, those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0036] This application is described below with reference to the accompanying drawings and specific embodiments:

[0037] This invention provides a drill bit, such as... Figure 1 , 2 As shown in Figure 3, the main body 1 has a drill hole 2. The inner wall of the main body 1 is provided with a first limiting part 3 and an elastic deformation member 4 in sequence along the direction in which the rock sample enters the drill bit. There is a gap 41 between the elastic deformation member 4 and the inner wall of the drill hole 2.

[0038] An advance member 5 is disposed within the borehole 2. The advance member 5 includes an action part 51 and a drive part 52 connected to the action part 51. The distance between the drive part 52 and the center line of the borehole 2 is less than the distance between the action part 51 and the center line of the borehole 2.

[0039] A sleeve 6 is disposed within the drilled hole 2; one end of the sleeve 6 abuts against the first limiting part 3 via the actuating part 51, and the other end of the sleeve 6 is disposed within the gap 41; wherein...

[0040] The drive unit 52 is pushed by the force of the stratum rock sample entering the sleeve 6 to continue moving the sleeve 6 into the gap 41, so as to compress the elastic deformation member 4 to tilt towards the center line of the borehole 2.

[0041] Here, when the drill bit is in use, the body 1 is the body of the drill bit. The body 1 performs drilling action and cuts the strata through the drill bit body 12 on the body 1, so that the rock core in the strata continuously enters the casing 6 in the borehole 2 through the opening 21 of the borehole 2. After the rock core is collected, the drill bit is withdrawn to obtain the rock core in the target stratum.

[0042] When in use, for core samples from soft and fragile formations, after the core sample is obtained, the sleeve 6 cannot effectively hold the core sample inside the sleeve 6 because the structure of the sleeve 6 and the borehole 2 is relatively fixed, thus making it impossible to successfully perform the core sampling operation.

[0043] Therefore, in order to improve the above problems, the present invention provides a first limiting part 3, a propulsion member 5 and an elastic deformation member 4 inside the borehole 2. Here, the first limiting part 3 and the elastic deformation member 4 are arranged sequentially on the inner wall of the body 1 along the direction in which the stratum rock sample enters the drill bit. That is, the elastic deformation member 4 is arranged closer to the borehole opening 21 than the first limiting part 3. The opening 21 is used for the stratum rock sample to enter the body 1 through the opening 21 when the borehole 2 is excavated. One end of the sleeve 6 abuts against the first limiting part 3 through the propulsion member 5, and the other end of the sleeve 6 is operatively connected to the elastic deformation member 4.

[0044] Thus, when the obtained rock core enters the borehole 2 and fills the interior of the sleeve 6, the rock core will act on the driving part 52 of the propulsion member 5, and then the action part 51 provided on the first limiting part 3 will provide force to the sleeve 6. After being subjected to the force, the sleeve 6 will move further in the depth direction of the gap 41.

[0045] Because the sleeve 6 is slidably connected to the elastic deformation member 4, and is inclined toward the center of the borehole 2 as the sleeve 6 moves toward the gap 41, the elastic deformation member 4 is forced to bend toward the centerline of the borehole 2. This causes the opening 21 of the borehole 2 to become smaller under the action of the elastic deformation member 4, thereby shrinking and clamping the rock core at the opening 21 of the borehole 2, thus capturing the rock core. This improves the success rate of coring soft or fragile rock and soil strata.

[0046] Here, the first limiting part 3 is disposed on the inner wall of the drill hole 2.

[0047] Specifically, the first limiting part 3 is fixedly connected to or detachably fixedly connected to the inner wall of the drill hole 2.

[0048] Specifically, the first limiting part 3 can be block-shaped, plate-shaped, or other shapes, and has a surface for abutting against the sleeve 6. More specifically, the first limiting part 3 can be arranged circumferentially along the inner wall of the drill hole 2, or it can be arranged in an array along the circumferentially of the inner wall of the drill hole 2. Preferably, the first limiting part 3 is arranged circumferentially along the inner wall of the drill hole 2.

[0049] The actuating part 51 of the propulsion member 5 is disposed on the first limiting part 3, and the braking part is disposed relatively close to the center line of the borehole 2 to facilitate force application. In this way, after the rock core enters the cavity inside the sleeve 6, it can better drive the braking part, thereby causing the actuating part 51 to move the sleeve 6.

[0050] Specifically, the propulsion component 5 includes, but is not limited to, a lever structure, an elastic lever structure, and a pneumatic drive structure. Preferably, the propulsion component 5 is an elastic lever structure, and when the actuating part 51 is subjected to pressure, the driving part 52 provides an elastic force to the sleeve 6.

[0051] The elastic deformation member 4 can be disposed at any position between the first limiting part 3 and the opening 21 of the drill hole 2. Specifically, the elastic deformation member 4 is disposed at the opening 21 of the drill hole 2.

[0052] Specifically, the gap 41 between the elastic deformable member 4 and the inner wall of the drill hole 2 is less than or equal to the thickness of the sleeve wall of the sleeve body 6.

[0053] Specifically, the connection between the sleeve 6 and the elastic deformable member 4 can be a point-to-slope connection or a surface-to-surface connection. More specifically, the sleeve 6 has a slope, and the elastic deformable member 4 is in point contact with the sleeve 6.

[0054] Specifically, the elastic deformation member 4 can be arranged circumferentially along the inner wall of the drilled hole 2, or it can be arranged in an array along the circumferential direction of the inner wall of the drilled hole 2. Preferably, the elastic deformation member 4 is arranged circumferentially along the inner wall of the drilled hole 2.

[0055] Furthermore, in this embodiment of the invention, a through hole 61 is formed on the side wall of the sleeve 6, and the through hole 61 extends through both ends of the sleeve 6 along the axial direction of the sleeve 6.

[0056] The inner wall of the inner cavity of the sleeve 6 is provided with an upper protrusion 62.

[0057] Here, in order to improve the fixation effect of the sleeve 6 on the core sample, a through hole 61 is made in the sleeve wall of the sleeve 6, so that the sleeve 6 has a C-shaped cross-section. In this way, when the core sample enters the sleeve 6 during use, the sleeve 6 will be stretched open by force, and at the same time, it will also generate a tightening force on the core sample, thereby improving the fixation of the core sample.

[0058] Specifically, the size of the through hole 61 can be set and adjusted as needed.

[0059] Meanwhile, the protrusion 62 is used to increase the contact area between the sleeve 6 and the core sample, so that the core sample in the cavity is more stably set in the sleeve 6. In conjunction with the clamping effect of the elastic deformation member 4, the success rate of core sampling for soft or fragile rock formations is further improved.

[0060] Specifically, the protrusions 62 can be arranged in an array on the inner surface of the cavity.

[0061] Specifically, the structure of the protrusion 62 includes, but is not limited to, cylindrical, conical, spherical, and hemispherical shapes.

[0062] Furthermore, in this embodiment of the invention, the body 1 includes: a drill body 11, the drill hole 2 being formed on the drill body 11; a drill bit body 12, which is detachably and fixedly sleeved on the drill hole 2, and the elastic deformation member 4 being disposed in the drill hole 2 by connecting with the drill bit body 12.

[0063] The elastic deformation member 4 includes a plurality of elastic plates, which are distributed circumferentially along the inner wall of the borehole 2.

[0064] Here, the drill bit body 12 is used to cut the formation, allowing rock cores to continuously enter the drill bit. During use, diamond particles are sintered onto the surface of the drill bit body 12.

[0065] The drill bit body 12 is disposed at the opening 21 of the borehole 2 by being detachably and fixedly connected to the drill body 11. Specifically, the drill bit body 12 is rotatably connected to the drill body 11.

[0066] The elastic deformable element 4 can be installed inside the drill hole 2 by connecting it to the drill bit body 12.

[0067] The elastic deformation member 4 is composed of a plurality of elastic sheets located inside the borehole 2 and arranged circumferentially along the inner wall of the borehole 2. The elastic sheets are spaced apart, so that when the elastic sheets bend into the borehole 2, they provide compensation and avoid mutual interference.

[0068] Furthermore, in this embodiment of the invention, a stop 7 is provided inside the borehole 2. The stop 7 has the freedom to move in the direction of the formation rock sample entering the borehole 2. The stop 7 includes: a first working surface 71, which is disposed on one side of the stop 7 and is disposed opposite to the opening 21 of the borehole 2; and a second working surface 72, which is disposed on the other side of the stop 7 opposite to the first working surface 71 and abuts against the driving part 52.

[0069] The propulsion component 5 is a lever component; a second limiting part 8 is also provided on the inner wall of the borehole 2, and the second limiting part 8 is located behind the first limiting part 3 in the direction of the formation rock sample entering the borehole 2; a third working surface 73 is provided on the stop 7, and the third working surface 73 is located in front of and behind the second limiting part 8 in the direction of the formation rock sample entering the borehole 2, and a gap is provided between the third working surface 73 and the second limiting part 8.

[0070] The main body 1 has an opening 22 on the inner wall of the drill hole 2 that connects to the outside. The second limiting part 8 is installed in the drill hole 2 by being detachably and fixedly inserted into the opening 22. The third working surface 73 is sleeved on the outside of the second limiting part 8.

[0071] Here, in order to increase the force-bearing area of ​​the drive unit 52, so that the drive unit 52 can accurately drive the action unit 51 to act on the sleeve 6, a stop 7 is provided in the borehole 2. The stop 7 has the degree of freedom to move along the axis of the borehole 2. When the stop 7 is subjected to the pressure of the core sample, it will move toward the drive unit 52 and squeeze the drive unit 52.

[0072] Specifically, in order to improve the effectiveness of the stop 7 and make it easier for the core sample to act on the stop 7, a first working surface 71 is provided on the stop 7 opposite to the opening 21 of the borehole 2; in order to transmit the force of the core sample entering the sleeve 6 to the drive part 52, a second working surface 72 is provided on the stop 7 opposite to the first working surface 71 and abutting against the drive part 52, and the second working surface 72 directly abuts against the drive part 52.

[0073] In addition, to limit the distance by which the stop 7 moves away from the depth direction of the gap 41 (i.e., as...), Figure 1 (shown in the left direction). Therefore, by adding the second limiting part 8 along the moving direction of the stop 7 away from the gap 41, and by the relative arrangement of the second limiting part 8 and the third working surface 73 and the reserved gap, the moving distance of the stop 7 is limited, thereby providing protection for the various components in the borehole 2.

[0074] In order to further limit the movement position of the stop 7 within the borehole 2, the third working surface 73 is disposed at both ends of the stop 7 along the movement direction of the stop 7 along the axis of the borehole 2.

[0075] In order to further limit the rotation of the stop 7 within the borehole 2, the third working surface 73 is fitted onto the second limiting part 8. Specifically, the third working surface 73 is an annular surface surrounding the second limiting part 8.

[0076] Specifically, the stop 7 can be arranged circumferentially along the inner wall of the borehole 2, or it can be arranged in an array along the inner wall of the borehole 2.

[0077] More specifically, the stop 7 is a circular annular platform arranged circumferentially along the inner wall of the drill hole 2, and the first working surface 71 is the end face of the circular annular platform near the opening 21 of the drill hole 2, as shown in the figure. Figure 1 The right end face of the stop 7 shown in the figure has a second working surface 72 which is disposed opposite to the first working surface 71 and abuts against the drive part 52. An extension portion extending toward the interior of the drill hole 2 is also provided on the second working surface 72, wherein the third working surface 73 is disposed on the extension portion.

[0078] Specifically, the third working surface 73 is an annular cylindrical surface, and the second limiting part 8 includes, but is not limited to, a pin, screw, or other structure disposed on the opening 22. The second limiting part 8 is disposed in the drill hole 2 through the opening 22 and is located within the third working surface 73.

[0079] Further, in this embodiment of the invention, the functional part 51 is an arc-shaped spring sheet with its opening facing the gap 41; the driving part 52 is an arc-shaped spring sheet with its opening facing away from the gap 41, and the bottom of the opening of the driving part 52 is located on the bottom of the opening; one end of one side wall of the functional part 51 abuts against the sleeve 6, the arc-shaped part of the functional part 51 abuts against the first limiting part 3, the other end of the functional part 51 is connected to one side wall of the driving part 52, and the arc-shaped part of the driving part 52 abuts against the stop 7; wherein, the functional part 51 and the driving part 52 are connected and form a spring sheet with an S-shaped cross-section.

[0080] Here, as Figure 1 As shown, the propulsion member 5 is a spring sheet with an S-shaped cross section. When the spring sheet in the driving part 52 is compressed, the action part 51 provides driving force to the sleeve 6, thereby moving the sleeve 6.

[0081] Specifically, the propulsion member 5 can be arranged circumferentially along the inner wall of the borehole 2, or it can be arranged in an array along the circumferentially of the inner wall of the borehole 2. Preferably, the propulsion member 5 is an annular spring sheet arranged circumferentially along the inner wall of the borehole 2.

[0082] Furthermore, embodiments of the present invention provide a wellbore coring instrument, including the drill bit described in the above embodiments.

[0083] Here, the drill bit of the wellbore coring instrument includes: a drill rod (i.e., the drill body 11), a diamond drill bit (i.e., the drill bit body 12), a core ferrule (i.e., the sleeve 6), a retaining ring (i.e., the stop 7), an elastic semi-ring (i.e., the pusher 5), and an expansion pin (i.e., the second limiting part 8). The drill rod (i.e., the drill body 11) is the base of the diamond drill bit (i.e., the drill bit body 12). Other parts are installed inside or at the end of the drill rod (i.e., the drill body 11). Structurally, the drill rod (i.e., the drill body 11) is a hollow thin-walled circular sleeve with a step at one end (i.e., the first limiting part 3) and a thread at the other end for installing the diamond drill bit (i.e., the drill bit body 12). The elastic semi-ring (i.e., the pusher 5) is an S-shaped thin-walled part, and two of them are embedded in the retaining ring (i.e., the stop 7). The retaining ring (i.e., the retaining member 7) and the elastic half-ring (i.e., the pushing member 5) are installed together inside the drill rod (i.e., the drill body 11) and mounted on the drill rod (i.e., the drill body 11) by an expansion pin (i.e., the second limiting part 8). The fixing hole (i.e., the drill hole 2) on the drill rod (i.e., the drill body 11) is an elongated hole. After installation, the retaining ring (i.e., the retaining member 7) can move slightly in the axial direction of the drill rod (i.e., the drill body 11) and squeeze the elastic half-ring under a certain pressure. (i.e., the propulsion component 5), which can cause elastic deformation; the core ferrule (i.e., the sleeve body 6) is a thin-walled C-shaped elastic sleeve with a long notch along the axial direction (i.e., the through hole 61), and multiple protrusions (i.e., the protrusions 62) along the axial direction on the inner surface. The inner diameter of the protrusions (i.e., the protrusions 62) is slightly smaller than the core. When the core enters the drill bit, it can open outward to generate elastic deformation and clamp the core; one section of the core ferrule (i.e., the sleeve body 6) has a wedge-shaped step, which is used to insert the diamond drill bit. The diamond drill bit (i.e., the drill bit body 12) is located in the U-shaped groove (i.e., the gap 41). The diamond drill bit (i.e., the drill bit body 12) is a U-shaped part with a stainless steel base and diamond particles sintered and inlaid on the surface. One side is machined with internal threads for connection with the drill rod (i.e., the drill body 11), and the other side is a thin wall (i.e., the elastic deformation member 4). Multiple notches are machined on the thin wall (i.e., the elastic deformation member 4), which can be squeezed inward by the wedge-shaped step of the retaining ring (i.e., the retaining member 7) to clamp the end of the rock core.

[0084] The specific workflow of the drill bit for the wellbore coring instrument includes:

[0085] As the drill bit continues to drill, the diamond drill bit (i.e., the drill bit body 12) cuts through the formation and continuously enters the drill bit's interior. The core chuck (i.e., the sleeve 6) is opened, and the protrusions of the core chuck (i.e., the sleeve 6) clamp the core. As the core continuously enters and adheres to the retaining ring (i.e., the retainer 7), under the pressure of the core, the retaining ring (i.e., the retainer 7) presses against the elastic semi-ring (i.e., the pusher 5) and moves to the left. The elastic semi-ring (i.e., the pusher 5) deforms under pressure, squeezing the core chuck (i.e., the sleeve 6) to the right. The core chuck (i.e., the sleeve 6) moves into the U-shaped groove (i.e., the gap 41) of the diamond drill bit (i.e., the drill bit body 12) and squeezes the thin wall (i.e., the elastic deformable member 4), causing it to contract inward and clamp the root of the core, thus capturing the core. With the coordinated action of other mechanisms, after completing the breaking and pushing actions, the drill bit returns to its original shape.

[0086] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0087] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0088] It should be noted that all directional indications in the embodiments of this application are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indication will also change accordingly. In this application, unless otherwise explicitly specified and limited, the terms "connection" and "fixed" should be interpreted broadly. For example, "fixed" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction relationship between two components, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances. In addition, the descriptions involving "first," "second," etc., in this application are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first" or "second" may explicitly or implicitly include one or more of the aforementioned features. In the description of this application, "multiple" means two or more, unless otherwise explicitly and specifically limited.

[0089] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0090] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0091] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A drill bit, characterized in that, The drill bit includes: The body (1) has a drill hole (2), and the inner wall of the body (1) is provided with an elastic deformation member (4) and a first limiting part (3) in sequence along the direction in which the stratum rock sample enters the drill bit; wherein, there is a gap (41) between the elastic deformation member (4) and the inner wall of the drill hole (2). An advance member (5) is disposed in the borehole (2). The advance member (5) includes an action part (51) and a drive part (52) connected to the action part (51). The distance between the drive part (52) and the center line of the borehole (2) is less than the distance between the action part (51) and the center line of the borehole (2). A sleeve (6) is disposed within the drill hole (2); one end of the sleeve (6) abuts against the first limiting part (3) via the actuating part (51), and the other end of the sleeve (6) is disposed within the gap (41); wherein, The drive unit (52) is subjected to the force of the stratum rock sample entering the sleeve (6) and pushes the sleeve (6) to continue moving into the gap (41) so as to squeeze the elastic deformation member (4) to be inclined toward the center line of the borehole (2).

2. A drill bit according to claim 1, characterized in that, A through hole (61) is provided on the side wall of the sleeve (6), and the through hole (61) passes through both ends of the sleeve (6) along the axial direction of the sleeve (6).

3. A drill bit according to claim 1, characterized in that, The inner wall of the inner cavity of the sleeve (6) is provided with an upper protrusion (62).

4. A drill bit according to claim 1, characterized in that, The body (1) includes: Drill body (11), the drill hole (2) is formed on the drill body (11); The drill bit body (12) is detachably and fixedly mounted on the drill hole (2), and the elastic deformation member (4) is disposed in the drill hole (2) by connecting with the drill bit body (12).

5. A drill bit according to claim 1, characterized in that, The elastic deformation member (4) includes several elastic plates, which are distributed circumferentially along the inner wall of the borehole (2).

6. A drill bit according to claim 1, characterized in that, A stop (7) is provided inside the borehole (2). The stop (7) has a degree of freedom of movement in the direction in which the formation rock sample enters the borehole (2). The stop (7) includes: The first working surface (71) is disposed on one side of the stop (7) and is disposed opposite to the opening (21) of the drill hole (2); The second working surface (72) is disposed on the other side of the stop (7) opposite to the first working surface (71) and abuts against the drive part (52).

7. A drill bit according to claim 6, characterized in that, The propulsion component (5) is a lever component; A second limiting part (8) is also provided on the inner wall of the borehole (2). The second limiting part (8) is located behind the first limiting part (3) in the direction that the stratum rock sample enters into the borehole (2). The stop (7) is provided with a third working surface (73), which is arranged on the front and rear sides of the second limiting part (8) along the direction of the formation rock sample entering the borehole (2), and a gap is provided between the third working surface (73) and the second limiting part (8).

8. A drill bit according to claim 7, characterized in that, The main body (1) has an opening (22) on the inner wall of the drill hole (2) that connects to the outside. The second limiting part (8) is installed in the drill hole (2) by being detachably and fixedly inserted into the opening (22). The third working surface (73) is fitted on the outside of the second limiting part (8).

9. A drill bit according to claim 7, characterized in that, The working part (51) is an arc-shaped spring sheet with its opening facing the gap (41); The drive unit (52) is an arc-shaped spring sheet with an opening facing away from the gap (41); The end of one side wall of the function part (51) abuts against the sleeve (6), the arc-shaped part of the function part (51) abuts against the first limiting part (3), the end of the other side wall of the function part (51) is connected to one side wall of the drive part (52), and the arc-shaped part of the drive part (52) abuts against the stop (7). The active part (51) and the driving part (52) are connected and form a spring sheet with an S-shaped cross-section.

10. A wellbore coring instrument, characterized in that, The drill bit includes any one of claims 1 to 9.

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