Coring cylinder for core sampling and use method

Abstract

The invention relates to the technical field of rock core sampling equipment, and particularly discloses a coring cylinder for rock core sampling and a use method. The coring cylinder comprises a body provided with a drill tail end and a connecting end; the body is provided with a containing cavity. The body comprises an outer shell, an inner shell forming a first channel with the outer shell, a cutting assembly, a transmission mechanism used for controlling the cutting assembly to slide along the first channel, a locking mechanism installed on the inner shell and a trigger column with one end extending into the containing cavity. The locking mechanism is located between the transmission mechanism and the trigger column. The first channel comprises a vertical section and a radial section. The invention also discloses a use method thereof. The cutting assembly can move in the first channel, the length of the cutting assembly is not affected by the wall thickness of the annular drill bit, the cutting assembly can be arranged to be longer so as to increase the radial depth of rock core cutting and reduce the force application strength of a mother rock to a rock core when the annular drill bit is lifted upwards, and even the cutting assembly can be arranged to be long enough according to needs so that the cutting assembly can completely cut off the whole rock core; and the coring yield can be increased.

Description

Technical Field

[0001] The invention relates to the technical field of core sampling equipment, and more particularly to an annular drill core barrel for core sampling and a use method thereof. Background Art

[0002] Core sampling is a common operation in geological exploration and development. Its purpose is to obtain cores and determine the rock physical properties, oil saturation, etc. of the reservoir through core analysis. Through these studies, resource reserves can be evaluated and development economics can be evaluated, providing important reference for resource exploration and development.

[0003] Existing core sampling devices usually use an annular drill bit, the upper end of which is detachably connected to the drill string. When in use, first connect an ordinary drill bit to the drill string and use the ordinary drill bit to drill to the target formation, then pull out the drill and replace the annular drill bit to continue drilling. During the drilling process of the annular drill bit, part of the rock is cut into columns by the annular drill bit and enters the middle cavity of the annular drill bit.

[0004] When the annular drill bit in the prior art stops rotating in the formation, the bottom of the core sample is connected to the formation rock (hereinafter referred to as the matrix rock), so that when the annular drill bit is lifted up, the core falls off the annular drill bit due to the pulling force of the matrix rock, resulting in the failure of coring.

[0005] The Chinese patent with application number CN202211098517.X provides a core sampling device for geotechnical engineering, in which a cutting knife is arranged radially along an annular drill bit, and the upward movement of the core in the annular drill bit is used to drive the cutting knife to move radially to cut the core, and the annular drill bit is lifted up after the core is cut; however, the radial arrangement and length of the cutting knife of the core sampling device are limited by the wall thickness of the drill bit, and cannot extend to the center line of the annular drill bit, so that the final cutting depth is limited, and it is difficult to completely cut off the core; in addition, during the coring process of the core sampling device, the distance that the core drives the jacking column to move upward is proportional to the radial movement distance of the cutting knife, which will cause the core to be continuously cut during the rising process in the coring barrel, forming a smooth curved surface or inclined surface at the bottom of the core, and when the core barrel is pulled up later, the core will move downward under the action of its own gravity, squeezing the cutting knife into the wall of the core barrel, and the core itself will fall off from the core barrel, resulting in coring failure. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a core sampling barrel and a use method thereof; the barrel can effectively prevent the core from falling from the containing cavity and improve the success rate of core sampling;

[0007] The solution adopted by the present invention to solve the technical problem is:

[0008] on the one hand:

[0009] The present invention discloses a core sampling barrel for core sampling, comprising a body provided with a drill tail end and a connection end; the body is provided with a receiving cavity; the body comprises an outer shell, an inner shell coaxially arranged with the outer shell and forming a first channel therebetween, a cutting assembly located in the first channel and slidably matched with the first channel, a transmission mechanism fixedly connected to the cutting assembly at one end and used to control the cutting assembly to slide along the first channel, a locking mechanism installed on the inner shell, and a trigger column installed on the inner shell and extending into the receiving cavity at one end; the trigger column can be pushed by the core moving axially along the receiving cavity and trigger the locking structure to be converted from a locked state to a released state, thereby driving the cutting assembly to move toward the core along the first channel and abut against the peripheral wall of the core;

[0010] The locking mechanism is located between the transmission mechanism and the trigger column;

[0011] The accommodating cavity is located in the inner shell and is provided with an opening on one side close to the drill tail end;

[0012] The first channel comprises a vertical section arranged along the axial direction of the shell, and a radial section smoothly connected to the vertical section and arranged along the radial direction of the shell; the transmission mechanism is slidably matched with the vertical section.

[0013] The transmission mechanism comprises a transmission structure having one end fixedly connected to the cutting assembly and capable of moving along the vertical section, and a first elastic element for pushing the transmission structure to move toward the drill tail end.

[0014] In the present invention, when the locking mechanism is in a locked state, the cutting assembly is located in the first channel; when the locking mechanism is in a released state, one end of the cutting assembly extends into the accommodating chamber and abuts against the peripheral wall of the core; the trigger column is located at an end of the accommodating chamber away from the drill tail end, the trigger column extends into the accommodating chamber and can be pushed by the core moving axially along the accommodating chamber to trigger the locking mechanism to change from a locked state to a released state.

[0015] When the present invention is used, as drilling proceeds, the core enters the accommodating chamber and finally abuts against the trigger post. After the trigger post is pushed by the core, the locking mechanism is triggered to operate. Then, the transmission structure, under the action of the first elastic element, pushes the cutting assembly to move along the first channel and extend into the accommodating chamber to abut against the side wall of the core and cut the core. After the cutting is completed, the cutting assembly remains in place to prevent the core from falling from the accommodating chamber, thereby improving the coring recovery rate.

[0016] In some possible implementations, in order to effectively achieve the cutting of the core, the cutting assembly in the present invention can move along the first channel and extend into the accommodating cavity, so it is required to have a certain flexibility and be able to pass through the curved connecting section between the vertical section and the radial section. At the same time, it is also necessary to prevent the flexible cutting assembly extending into the accommodating cavity from bending under the action of gravity and losing the cutting ability. Moreover, when the cutting assembly is arranged horizontally, the stronger the anti-bending ability is, the faster the cutting rate is.

[0017] The cutting assembly comprises a base, a transmission block and a cutting knife which are hinged in sequence through a hinge mechanism; the transmission blocks are multiple groups and are hinged in sequence through a hinge mechanism;

[0018] Wherein, the articulated mechanism includes a first articulated component, a second articulated component plugged into and matched with the first articulated component and rotatably connected via a rotating shaft, and a limiting mechanism for limiting the rotation angle range of the first articulated component and the second articulated component; the rotation angle range is 0-180°.

[0019] In some possible implementations, in order to effectively limit the rotation angle range of the first hinge and the second hinge;

[0020] The limiting mechanism includes two groups of first protrusions located on a side of the first hinge close to the second hinge and arranged in parallel, and a second protrusion located on a side of the second hinge close to the first hinge and used in conjunction with the two groups of first protrusions. A slot is formed between the two groups of the first protrusions, and an insertion block is provided between the two groups of the second protrusions for use in conjunction with the slot. The insertion block and the first protrusion are rotationally matched through a rotating shaft.

[0021] In some possible implementations,

[0022] The inner shell is provided with a second through hole communicating with the accommodating cavity and arranged axially along the inner shell at one end away from the drill tail end, and a radial through hole communicating with the second through hole and arranged radially along the inner shell, and one end of the trigger column passes through the second through hole and can move axially along the second through hole;

[0023] The trigger column comprises an enlarged diameter section, a reduced diameter section, and a reduced diameter section which are coaxially connected in sequence, and one end of which extends into the accommodating cavity. The outer side surfaces of the enlarged diameter section, the reduced diameter section, and the reduced diameter section cooperate with each other to form a trigger groove used in conjunction with the locking mechanism.

[0024] The locking mechanism is installed in the radial through hole and telescopically moves along the axial direction of the radial through hole.

[0025] In some possible implementations,

[0026] The diameter expansion section is cylindrical and has an outer diameter that is consistent with the inner diameter of the second through hole;

[0027] The reducing section is in a truncated cone shape, the outer diameter of the large end of which is consistent with the outer diameter of the expanding section, and the large end of the reducing section is connected to the expanding section;

[0028] The reduced diameter section is cylindrical and connected to the small end of the reduced diameter section, and the outer diameter of the small end of the reduced diameter section is consistent with the outer diameter of the reduced diameter section.

[0029] In some possible implementations,

[0030] The second through hole is connected to the radial through hole via a connecting hole;

[0031] The locking mechanism comprises a pin installed in the radial through hole and arranged along the axial direction thereof, and a second elastic element for pushing one end of the pin against the peripheral side wall of the contact post;

[0032] When one end of the pin abuts against the peripheral side wall of the expanded diameter section, the other end of the pin abuts against and locks the transmission mechanism;

[0033] When one end of the pin abuts against the peripheral side wall of the reduced diameter section, the other end of the pin disengages from and releases the transmission mechanism.

[0034] In some possible implementations, in order to effectively implement the locking transmission structure;

[0035] The transmission mechanism is provided with a notch which is arranged along the radial direction of the inner shell and extends along the axial direction of the outer shell. One end of the pin is inserted into the notch to lock the transmission structure.

[0036] When one end of the pin that abuts the trigger column abuts the peripheral side wall of the reduced diameter section, the pin is aligned with the slot, and then the trigger column is pushed along the expanded diameter section toward the reduced diameter section. The end of the pin that abuts the trigger column will slide along the peripheral side wall of the trigger column until it abuts against the peripheral side wall of the expanded diameter section, thereby achieving resetting.

[0037] In some possible implementations,

[0038] The first channels are divided into two groups and are evenly arranged along the circumference of the shell. The cutting assembly, the transmission mechanism, the locking mechanism and the first channels are arranged in a one-to-one correspondence.

[0039] On the other hand:

[0040] The present invention discloses a method for using the coring barrel for core sampling based on the above, which specifically comprises the following steps:

[0041] The cutting edge provided at the drill tail end acts on the parent rock;

[0042] The core enters the accommodating cavity under the action of the cutting blade and finally abuts against the trigger column, pushing the trigger column to move to the side away from the drill tail end;

[0043] The locking mechanism moves toward the trigger column under the action of the second elastic element and abuts against the inner side of the trigger groove;

[0044] The transmission structure pushes the cutting assembly to move along the first channel under the action of the first elastic element and extend into the accommodating cavity to abut against the peripheral wall of the core and cut the core;

[0045] After the core is cut, remove it;

[0046] The transmission mechanism is controlled to move to a side away from the drill tail end, the cutting assembly is retracted into the first channel, and the core leaves the accommodation cavity under the action of gravity;

[0047] The trigger column is controlled to move toward the side close to the drill tail end, and the trigger column will push the locking mechanism to move and the side of the locking mechanism close to the shell is inserted into the notch to complete the reset.

[0048] Compared with the prior art, the present invention has the following beneficial effects:

[0049] The cutting assembly of the present invention can move along the first channel including the vertical section and the radial section, so it can be arranged along the vertical section and the radial section. Its length is not affected by the wall thickness of the core barrel, and can be set longer to increase the radial depth of core cutting and reduce the force strength of the parent rock on the core when the annular drill bit is lifted. The cutting assembly can even be set long enough to completely cut the entire core as required, which is conducive to increasing the coring recovery rate.

[0050] After the core cutting operation of the present invention is completed, the elastic action of the first elastic element will maintain the cutting assembly extending into the accommodating chamber. At this time, the cutting assembly will intercept the core in the accommodating chamber to prevent it from slipping out of the accommodating chamber, and even provide support for the core during the process of lifting the annular drill bit, thereby assisting the core that has not been completely separated from the mother rock to be separated from the mother rock by fracture, which is beneficial to increase the success rate of coring. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 is a cross-sectional view of the coring barrel of Example 1 of the present invention when it is in a state of drilling a core;

[0052] Figure 2 is a cross-sectional view of the coring barrel of Example 1 of the present invention when it is in a core cutting state;

[0053] Figure 3 is a cross-sectional view of the inner shell and outer shell assembly mechanism in Example 1 of the present invention;

[0054] Figure 4 yes Figure 1 A partial enlarged view of the middle A;

[0055] Figure 5 is a front view of the transmission mechanism in Embodiment 1 of the present invention;

[0056] Figure 6 yes Figure 5 Section view along section BB;

[0057] Figure 7 is a cross-sectional view of the trigger column in Example 1 of the present invention;

[0058] Figure 8 is a schematic diagram of the mechanism of the cutting assembly in Example 1 of the present invention;

[0059] Fig. 9 is a schematic diagram of the hinge mechanism in Example 1 of the present invention;

[0060] Wherein: 1, cutting blade; 2, core; 3, accommodating chamber; 4, inner shell; 5, outer shell; 6, cutting assembly; 7, transmission mechanism; 8, first elastic element; 9, locking mechanism; 10, trigger column; 11, first channel; 101, drill tail end; 102, connecting end; 401 second through hole; 402, radial through hole; 501, second boss; 701, first boss; 601, hinge mechanism; 602, base; 603, transmission block; 604, cutter; 9 01, pin; 902, second elastic element; 903, notch; 1001, diameter expansion section; 1002, diameter reduction section; 1003, diameter reduction section; 1004, limit section; 1005, support section; 1101, vertical section; 1102, radial section; 6011, first hinge; 6012, second hinge; 6013, limit mechanism; 6014, rotating shaft; 60111, first protrusion; 60121, second protrusion; 200, horizontal rod. DETAILED DESCRIPTION

[0061] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral body; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. The "first", "second" and similar words mentioned in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, "one" or "one" and other similar words do not indicate a quantity restriction, but indicate the existence of at least one. In the implementation of this application, "and / or" describes the association relationship of the associated objects, indicating that there can be three relationships, for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In the description of the embodiments of the present application, unless otherwise specified, the meaning of "multiple" refers to two or more. For example, multiple positioning columns refer to two or more positioning columns. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] The present invention is described in detail below.

[0063] Please refer to Figure 1 and Figure 2 , Figure 1 is a cross-sectional view of the coring barrel of Example 1 of the present invention when it is in a state of drilling a core; Figure 2It is a cross-sectional view of the coring barrel of Example 1 of the present invention when it is in a core cutting state.

[0064] The core sampling barrel of the present embodiment has a cutting blade portion 1, one end of which is a drill tail end 101, and the other end is a connecting end 102. The connecting end 102 is provided with a connecting mechanism for fixedly connecting with an upper drill string (not shown in the figure), so that the drill string can drive the core sampling barrel to rotate and move in the wellbore; the cutting blade portion 1 is arranged at the drill tail end, and is used to cut the parent rock to produce a cylindrical core 2.

[0065] The annular drill bit is provided with a receiving chamber 3 for receiving the core 2, and the lower part of the receiving chamber 3 passes through the drill tail end 101. Therefore, as the core barrel rotates continuously, the core 2 will enter the receiving chamber 3 and move upward along its axial direction. These are conventional settings of the existing core barrel and will not be described in detail here;

[0066] Please continue to refer to Figure 1 and Figure 2 The core barrel of this embodiment further includes an inner shell 4, an outer shell 5, a cutting assembly 6, a transmission structure 7, a first elastic element 8, a locking mechanism 9 and a trigger column 10.

[0067] Please combine Figure 3 , Figure 3 It is a cross-sectional view of the combination mechanism of the inner shell 4 and the outer shell 5 of this embodiment. The inner shell 4 and the outer shell 5 are coaxially fixedly connected, and a first channel 11 is formed between the inner shell 4 and the outer shell 5. The first channel 11 includes a vertical section 1101 extending axially along the outer shell 5, and a radial section 1102 located at the drill tail end 101 and extending radially along the outer shell 5. The two sections (vertical section 1101 and radial section 1102) are smoothly connected and connected, and the other end of the radial section 1102 is connected to the accommodating chamber 3; the shape of the first channel 11 matches the cutting assembly 6 and is slidably installed in the first channel 11, so that the cutting assembly 6 can be accommodated in the first channel 11 and move along the first channel 11 to extend into the accommodating chamber 3 to cut the core 2.

[0068] The transmission mechanism in the present invention is mainly used to control the movement of the cutting assembly 6 in the first channel 11, and cut the core 2 after reaching the cutting position. For example, a linear electric push rod can be connected to one end of the cutting assembly 6 to realize drive control;

[0069] This device is mainly used for underground work, and the use of linear electric push rods makes the structure more complicated;

[0070] The core barrel of this embodiment controls the cutting assembly 6 to move along the first channel 11 through the linkage of the trigger column 10 , the locking mechanism 9 , the first elastic element 8 , and the transmission structure 7 .

[0071] The lower end of the transmission structure 7 (the end close to the cutting blade 1 ) is inserted into the first channel 11 and fixedly connected to the cutting assembly 6 . Therefore, the transmission structure 7 that moves axially along the housing 5 can drive the cutting assembly 6 to move in the first channel 11 .

[0072] Please combine Figures 4 to 6 , Figure 4 yes Figure 1 A partial enlarged view of the A part. Figure 5 This is the front view of the transmission structure. Figure 6 yes Figure 5 The sectional view along the BB section. The transmission structure 7 (the end close to the cutting blade 1) is provided with a first boss 701, the inner wall of the housing 5 is fixed with a second boss 501, the first elastic element 8 is arranged axially along the housing 5, and the two ends of the first elastic element 8 are respectively fixedly connected to the first boss 701 and the second boss 501, and the transmission structure 7 is pushed to move toward the drill tail end 101 under the elastic action of the first elastic element 8, thereby driving the movement of the cutting assembly 6.

[0073] The locking mechanism 9 is used to lock the transmission structure 7, and the locking mechanism 9 includes a locking state and a release state; Figure 1 As shown, when the locking mechanism 9 is in the locked state, the first elastic element 8 is in the compressed state, and at this time, the cutting assembly 6 is completely accommodated in the first channel 11;

[0074] like Figure 2 As shown, when the locking mechanism 9 is in the released state, the first elastic element 8 is in the extended state, one end of the cutting assembly 6 extends into the accommodating cavity 3 and abuts against the peripheral wall of the core 2, and as the coring barrel rotates, the cutting assembly 6 continuously cuts the core 2.

[0075] The trigger column 10 is located at one end of the accommodating chamber 3 away from the drill tail end 101, and the lower end of the trigger column 10 (the end close to the cutting blade 1) extends into the accommodating chamber 3. The core 2 entering the accommodating chamber 3 pushes the trigger column 10 to move during the axial movement along the accommodating chamber 3, thereby triggering the locking mechanism 9 to change from a locked state to a released state. The specific mechanism is as follows.

[0076] Please refer to Figure 3 , Figure 4 The inner shell 4 is provided with an axially arranged second through hole 401 and a radially arranged radial through hole 402 at one end away from the drill tail end 101. One end of the radial through hole 402 penetrates the inner shell 4 body and communicates with the first channel 11, and the other end communicates with the second through hole 401 through a radially arranged communicating small hole. One end of the trigger column 10 passes through the second through hole 401 and can move axially along the second through hole 401.

[0077] The locking mechanism 9 includes a pin 901, a second elastic element 902, and a notch 903 located on the transmission structure 7 and arranged radially along the inner shell 4, wherein the pin 901 and the second elastic element 902 are both located in the radial through hole 402, and the second elastic element 902 pushes the first end of the pin 901 to move toward the second through hole 401 and abut against the peripheral side wall of the hairpin 10.

[0078] Please refer to Figure 7 , Figure 7 4 is a cross-sectional view of the trigger column, wherein the trigger column 10 comprises an enlarged diameter section 1001, a reduced diameter section 1002 and a reduced diameter section 1003 which are coaxially connected in sequence from top to bottom; the enlarged diameter section 1001 is cylindrical and has an outer diameter which is consistent with the inner diameter of the second through hole 401; the reduced diameter section 1002 is truncated cone-shaped, and the outer diameter of the large end thereof is consistent with the outer diameter of the enlarged diameter section 1001, and the large end of the reduced diameter section 1002 is connected to the enlarged diameter section 1001; the reduced diameter section 1003 is cylindrical and connected to the small end of the reduced diameter section 1002, and the outer diameter of the small end of the reduced diameter section 1002 is consistent with the outer diameter of the reduced diameter section 1003;

[0079] The outer diameter of the expanded diameter section 1001 is greater than that of the reduced diameter section 1003. The peripheral side walls of the expanded diameter section 1001, the reduced diameter section 1002 and the reduced diameter section 1003 are smooth, and the peripheral side walls of their connecting parts are also smooth and flat. Therefore, during the axial reciprocating movement of the trigger column 10 along the second through hole 401, the first end of the pin 901 can slide along the peripheral side wall of the trigger column 10.

[0080] When the first end of the pin 901 (the end close to the second through hole 401) contacts the side wall of the enlarged diameter section 1001 of the hair column 10, the second end of the pin 901 (the end away from the second through hole 401) extends into the notch 903 and locks the transmission structure 7;

[0081] When the first end of the pin 901 contacts the side wall of the reduced diameter section 1003 of the hairpin 10, the second end of the pin 901 disengages from the notch 903 and releases the transmission structure 7. After being released, the transmission structure 7 moves axially toward the drill tail end 101 along the housing 5 under the action of the first elastic element 8.

[0082] In addition, in order to prevent the entire trigger column 10 from falling from the second through hole 401, a limiting section 1004 whose size is larger than the second through hole 401 is provided at the upper part of the expanded diameter section 1001; a supporting section 1005 matching the second through hole 401 is also fixedly connected to the lower part of the reduced diameter section 1003, so that when the first end of the pin 901 abuts against the side wall of the reduced diameter section 1003, the side wall of the supporting section 1005 and the inner wall of the second through hole 401 are clearance-matched to maintain the entire trigger column 10 upright.

[0083] The expansion section 1001, the reduction section 1002 and the reduction section 1003 are arranged as described above to form a trigger groove whose depth increases from top to bottom. Before use, one end of the pin 901 will be located in the connecting hole, and the other end will extend into the groove. The transmission structure 7 is restricted by the pin 901 to move toward the drill tail section. When the top surface of the core 2 contacts and abuts the trigger column 10, and the trigger column 10 is controlled to move away from the drill tail groove, the trigger groove will also move upward, and the second elastic element 902 will recover from the compressed state to the initial state, so that one end of the pin 901 extends into the trigger groove until it abuts against the top surface of the support section 1005. At this time, the other end of the pin 901 will be located in the radial through hole 402, and the transmission structure 7 is no longer restricted by the pin 901, so that it moves along the axial direction of the shell 5, and controls the cutting assembly 6 to extend into the accommodating chamber 3 along the first channel to cut the core.

[0084] In addition, in order to facilitate the second end of the pin 901 to be easily inserted into the notch 903 when the transmission structure 7 is reset later, the notch 903 is configured as a rectangular notch extending along the axial direction of the housing 5 .

[0085] Please combine Figure 8 and Fig. 9 , Figure 8 is a schematic diagram of the mechanism of the cutting assembly 6, Fig. 9 It is a schematic diagram of the hinge mechanism 601. The cutting assembly 6 comprises a base 602, a plurality of transmission blocks 603, and a cutting knife 604 which are sequentially connected in series via the hinge mechanism 601. The plurality of transmission blocks 603 are also connected in series via the hinge mechanism 601. The base 602 is fixedly connected to the transmission structure 7.

[0086] The articulated mechanism 601 includes a first articulated component 6011, a second articulated component 6012 and a limiting mechanism 6013; the first articulated component 6011 and the second articulated component 6012 are plugged into one side close to each other; the first articulated component 6011 is rotatably connected to the second articulated component 6012 via a rotating shaft 6014, and the limiting mechanism 6013 is used to limit the range of the rotation angle ψ of the first articulated component 6011 and the second articulated component 6012.

[0087] The limiting mechanism 6013 includes two groups of first protrusions 60111 located on a side of the first hinge 6011 close to the second hinge 6012 and arranged in parallel, and a second protrusion 60121 located on a side of the second hinge 6012 close to the first hinge 6011 and used in conjunction with the two groups of first protrusions 60111, a slot is formed between the two groups of the first protrusions 60111, and an insert block used in conjunction with the slot is arranged between the two groups of the second protrusions, and the insert block and the first protrusion 60111 are rotatably matched through a rotating shaft;

[0088] For example, when the base 602 is hinged to the transmission block 603, the first hinge 6011 is arranged on a side of the base 602 close to the transmission block 603 adjacent thereto, and the second hinge 6012 is arranged on a side of the transmission block 603 close to the side where the first hinge 6011 is arranged;

[0089] When adjacent transmission blocks 603 are hinged, the first hinge 6011 is arranged on one group of transmission blocks 603, and the second hinge 6012 is arranged on one side of the other group of transmission blocks 603 close to the first hinge 6011;

[0090] When the transmission block 603 is hinged to the cutting knife 604, the first hinge 6011 is arranged on a side of the transmission block 603 close to the cutting knife 604, and the second hinge 6012 is arranged on a side of the cutting knife 604 close to the first hinge 6011;

[0091] During the rotation of the first hinge 6011 around the rotating shaft 6014, when the first protrusion 60111 abuts against the second protrusion 60121, the first hinge 6011 stops rotating, thereby limiting the upper limit of the rotation angle ψ range. In this embodiment, the upper limit of the rotation angle ψ range is 180°, so that the entire cutting assembly 6 is a straight line when arranged horizontally, so that it can be installed in the vertical section 1101 and enter the radial section 1102 along one end of the vertical section 1101.

[0092] Please refer to Figure 1 , Figure 2 When the present invention is in use, as the coring barrel is drilled, the core 2 enters the accommodating chamber 3 and finally abuts against the trigger column 10, pushing the trigger column 10 to move and thereby triggering the locking mechanism 9 to act. The transmission structure 7, under the action of the first elastic element 8, pushes the cutting assembly 6 to move along the first channel 11 and extend into the accommodating chamber 3 to abut against the side wall of the core 2 and cut the core 2. After the cutting is completed, the cutting assembly 6 remains in place to prevent the core 2 from falling from the accommodating chamber 3, thereby improving the success rate of coring.

[0093] Furthermore, the first elastic element 8 and the second elastic element 902 are both elastic components, preferably, compression springs;

[0094] In addition, in this embodiment, two first channels 11 are provided, and each first channel 11 is equipped with a cutting assembly 6, a first elastic element 8, a locking mechanism 9 and a transmission structure 7, so as to increase the cutting points and improve the cutting efficiency. At the same time, the two groups of cutting assemblies 6 are arranged in an array along the circumference of the housing 5, so that the two cutting assemblies 6 will not interfere with each other during the cutting process, and the core 2 can be cut quickly and completely. At the same time, the tops of the two transmission structures 7 are connected by a horizontal rod 200. After the core 2 is cut, the core barrel is lifted to the ground and detached from the drill string, and the horizontal rod 200 is pulled upward so that the second end of the pin 901 is aligned with the notch 903. At this time, the cutting assembly 6 is received in the first channel 11, and the core leaves the accommodating chamber 3 by its own weight, and then the trigger column 10 is pushed downward, and the trigger column 10 pushes the pin 901 to move and insert it into the notch 903, and the entire core barrel is reset, and the next coring operation can be performed.

[0095] The present invention is not limited to the above-mentioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A core sampling barrel for core sampling, comprising a body provided with a drill tail end and a connecting end; the body is provided with a receiving cavity; characterized in that: The body comprises an outer shell, an inner shell coaxially arranged with the outer shell and forming a first channel therebetween, a cutting assembly located in the first channel and slidably matched with the first channel, a transmission mechanism fixedly connected to the cutting assembly at one end and used to control the cutting assembly to slide along the first channel, a locking mechanism installed on the inner shell, and a triggering column installed on the inner shell and extending into the accommodating cavity at one end; the triggering column can be pushed by the core moving axially along the accommodating cavity and trigger the locking structure to convert from a locked state to a released state, thereby driving the cutting assembly to move toward the core along the first channel and abut against the peripheral wall of the core; The locking mechanism is located between the transmission mechanism and the trigger column; The accommodating cavity is located in the inner shell and is provided with an opening on one side close to the drill tail end; The first channel comprises a vertical section arranged along the axial direction of the shell, and a radial section smoothly connected to the vertical section and arranged along the radial direction of the shell; the transmission mechanism is slidably matched with the vertical section.

2. A core sampling barrel for core sampling according to claim 1, characterized in that: The transmission mechanism comprises a transmission structure having one end fixedly connected to the cutting assembly and capable of moving along the vertical section, and a first elastic element for pushing the transmission structure to move toward the drill tail end; When the locking structure is in a locked state, the first elastic element is in a compressed state, and the cutting assembly is located in the first channel; When the locking structure is in a released state, the first elastic element is in an extended state, and one end of the cutting assembly passes through the radial section, extends into the accommodating cavity and abuts against the peripheral wall of the core.

3. A core sampling barrel for core sampling according to claim 1, characterized in that: The cutting assembly comprises a base, a transmission block and a cutting knife which are hinged in sequence through a hinge mechanism; the transmission blocks are multiple groups and are hinged in sequence through a hinge mechanism; Wherein, the articulated mechanism includes a first articulated component, a second articulated component plugged into and matched with the first articulated component and rotatably connected via a rotating shaft, and a limiting mechanism for limiting the rotation angle range of the first articulated component and the second articulated component; the rotation angle range is 0-180°.

4. A core sampling barrel for core sampling according to claim 3, characterized in that: The limiting mechanism includes two groups of first protrusions located on a side of the first hinge close to the second hinge and arranged in parallel, and a second protrusion located on a side of the second hinge close to the first hinge and used in conjunction with the two groups of first protrusions. A slot is formed between the two groups of the first protrusions, and an insertion block is provided between the two groups of the second protrusions for use in conjunction with the slot. The insertion block and the first protrusion are rotationally matched through a rotating shaft.

5. A core sampling barrel for core sampling according to claim 1, characterized in that: The inner shell is provided with a second through hole communicating with the accommodating cavity and arranged axially along the inner shell at one end away from the drill tail end, and a radial through hole communicating with the second through hole and arranged radially along the inner shell, and one end of the trigger column passes through the second through hole and can move axially along the second through hole; The trigger column comprises an enlarged diameter section, a reduced diameter section, and a reduced diameter section which are coaxially connected in sequence, and one end of which extends into the accommodating cavity. The outer side surfaces of the enlarged diameter section, the reduced diameter section, and the reduced diameter section cooperate with each other to form a trigger groove used in conjunction with the locking mechanism. The locking mechanism is installed in the radial through hole and telescopically moves along the axial direction of the radial through hole.

6. A core sampling barrel for core sampling according to claim 5, characterized in that: The diameter expansion section is cylindrical and has an outer diameter that is consistent with the inner diameter of the second through hole; The reducing section is in a truncated cone shape, the outer diameter of the large end of which is consistent with the outer diameter of the expanding section, and the large end of the reducing section is connected to the expanding section; The reduced diameter section is cylindrical and connected to the small end of the reduced diameter section, and the outer diameter of the small end of the reduced diameter section is consistent with the outer diameter of the reduced diameter section.

7. A core barrel for core sampling according to claim 5, characterized in that: The second through hole is connected to the radial through hole via a connecting hole; The locking mechanism comprises a pin installed in the radial through hole and arranged along the axial direction thereof, and a second elastic element for pushing one end of the pin against the peripheral side wall of the contact post; When one end of the pin abuts against the peripheral side wall of the expanded diameter section, the other end of the pin abuts against and locks the transmission mechanism; When one end of the pin abuts against the peripheral side wall of the reduced diameter section, the other end of the pin disengages from and releases the transmission mechanism.

8. A core barrel for core sampling according to claim 7, characterized in that: The transmission mechanism is provided with a notch which is arranged along the radial direction of the inner shell and extends along the axial direction of the outer shell. One end of the pin is inserted into the notch to lock the transmission structure.

9. A core barrel for core sampling according to claim 1, characterized in that: The first channels are divided into two groups and are evenly arranged along the circumference of the shell. The cutting assembly, the transmission mechanism, the locking mechanism and the first channels are arranged in a one-to-one correspondence.

10. A method for using the core barrel for core sampling according to any one of claims 1 to 9, characterized in that: The specific steps include: The cutting edge provided at the drill tail end acts on the parent rock; The core enters the accommodating cavity under the action of the cutting blade and finally abuts against the trigger column, pushing the trigger column to move to the side away from the drill tail end; The locking mechanism moves toward the trigger column under the action of the second elastic element and abuts against the inner side of the trigger groove; The transmission structure pushes the cutting assembly to move along the first channel under the action of the first elastic element and extend into the accommodating cavity to abut against the peripheral wall of the core and cut the core; After the core is cut, remove it; The transmission mechanism is controlled to move to a side away from the drill tail end, the cutting assembly is retracted into the first channel, and the core leaves the accommodation cavity under the action of gravity; The trigger column is controlled to move toward the side close to the drill tail end, and the trigger column will push the locking mechanism to move and the side of the locking mechanism close to the shell is inserted into the notch to complete the reset.

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