Core barrel for geological drilling
By designing the relative motion between the inner and outer pipes and a multi-stage conical channel structure, the problem of low coring rate in geological drilling was solved, achieving efficient and low-cost continuous coring.
Patent Information
- Application Number
- CN202423274037.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-12-30
AI Technical Summary
Existing geological drilling coring equipment has a low coring rate in fractured or broken strata, is complex to operate, has high costs, and takes a long time to cor.
A core tube for geological drilling was designed, comprising an inner tube, an outer tube, and a centralizer. The inner tube has a first channel and a gradually increasing conical second channel. The centralizer has steel balls to enable relative movement between the inner and outer tubes, and adapts to the core fragmentation deformation force through multi-stage conical channels, thereby reducing the risk of core obstruction.
It improves the success rate of coring, reduces the number and time of coring operations, lowers the cost of drilling coring, and has a simple structure that does not change the original coring process.
Smart Images
Figure CN223523690U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to geological drilling technical field, more specifically, relate to a core barrel for geological drilling. BACKGROUND
[0002] Drilling coring needs to adopt coring device to collect geological core, and the required geological information is obtained by analyzing and researching the extracted core. Some strata have developed fissures, or the internal strata are broken, and when drilling and coring these bottom layers, the rock fragments entering the inner tube of the core cause the inner tube of the core to be blocked, thereby reducing the coring rate.
[0003] In the prior art, the coring rate can be improved by using unconventional coring tools, but such tools often have problems such as complex operation, high operation technical requirements, low reliability, short service life, etc. in actual field application, so there are problems such as multiple trips downhole, long coring operation time, high use cost, etc. in actual coring operation, and therefore lack of universality. UTILITY MODEL CONTENT
[0004] The utility model aims at providing a core barrel for geological drilling, which aims to solve the technical problems of the existing coring device in solving the low coring rate, such as complex structure, high operation requirement, long operation time and high cost.
[0005] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of providing a core barrel for geological drilling, which comprises:
[0006] An inner tube, the upper end of which is used to be fixed with a guide drill bit; the inner tube has a coring channel extending along its axial direction and penetrating through the bottom of the inner tube, and the coring channel comprises a first channel and a second channel connected in sequence from bottom to top;
[0007] An outer tube, which is sleeved outside the inner tube and is used to be fixed with an external body; and
[0008] A centralizing member, which is annularly arranged on the outer peripheral wall of the inner tube and is fixed with the inner tube; the outer peripheral wall of the centralizing member is provided with a plurality of groups of steel balls spaced apart along its circumferential direction, and each steel ball is in contact with the inner peripheral wall of the outer tube;
[0009] Among them, the first channel has equal diameters, and the second channel has a tapered structure with diameters gradually increasing from bottom to top.
[0010] In a possible implementation, the second channel is divided into a plurality of tapered channels with gradually changing taper angles, and the taper angles of the plurality of tapered channels gradually increase from bottom to top.
[0011] In some embodiments, the taper angle of the multi-stage taper channel is between 0.015° and 0.03°, and the taper angles of the multi-stage taper channel gradually increase in an arithmetic progression.
[0012] In an example, the multi-stage taper channel has equal extension heights in the vertical direction, and each extension height is twice the extension height of the first channel.
[0013] In a possible implementation, the centralizer comprises:
[0014] A centralizer ring is arranged on the outer circumferential wall of the inner pipe and fixed with the inner pipe.
[0015] A plurality of groups of fixing portions are arranged along the circumference of the centralizer ring; each fixing portion is provided with a limiting hole facing the inner circumferential wall of the outer pipe, and each limiting hole is provided with a steel ball.
[0016] In some embodiments, the bottom of each limiting hole is provided with an oil injection hole extending to the inner side wall of the centralizer ring along the radial direction of the centralizer ring; the inner side wall of the centralizer ring is provided with an annular groove in communication with each oil injection hole.
[0017] In an example, the centralizer ring is formed by bending the two ends of a flat steel inward to form a ring structure matching the outer circumferential wall of the inner pipe, and a threaded connecting piece is arranged between the two ends of the flat steel and the inner pipe; one end of the flat steel is provided with a plurality of first connecting holes, the other end of the threaded connecting piece is provided with a second connecting hole, the threaded connecting piece passes through the second connecting hole and one of the first connecting holes, and is screwed and fixed with the inner pipe.
[0018] In some embodiments, one end of the flat steel is provided with a slot extending inward along the circumference of the centralizer ring, and the other end of the flat steel is provided with a plug-in part matching the slot; the plug-in part is provided with a plurality of first connecting holes, and the second connecting hole is arranged through the slot along the radial direction of the centralizer ring.
[0019] In some embodiments, the two ends of the flat steel are arranged in front of and behind each other along the radial direction of the centralizer ring.
[0020] In a possible implementation, a plurality of centralizers are arranged along the axial direction of the inner pipe.
[0021] Compared with the prior art, the scheme shown in the embodiment of the application can realize the relative movement between the inner tube and the outer tube through the steel ball on the centralizing piece, keep the inner tube stable, improve the core taking success rate, and can design the core taking channel of the inner tube, adapt to the broken expansion deformation force of the core layer when moving in the core taking channel. Specifically, the lower end of the core taking channel is provided with a first channel with the same diameter to adapt to the core which initially enters the core taking channel and has no obvious broken expansion deformation force, and then the aperture of the second channel gradually increases from bottom to top to provide a proper broken expansion deformation space for the core entering the deep part of the inner tube, thereby reducing the internal pressure of the broken core, reducing the resistance of the core continuously entering the inner tube, reducing the probability of causing the core to be blocked due to the broken core, improving the core taking success rate, and reducing the core taking operation times and time. The core barrel for geological drilling provided by the embodiment of the application has simple structure, strong adaptability, and does not need to change the original core taking process, can realize continuous core taking, and greatly reduces the drilling core taking cost. BRIEF DESCRIPTION OF DRAWINGS
[0022] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating laborious work.
[0023] Figure 1 The half-section structure schematic diagram of the core barrel for geological drilling provided by the embodiment of the present application is shown in the figure.
[0024] Figure 2 The cross-sectional structure schematic diagram of the centralizing piece provided by the embodiment of the present application is shown in the figure.
[0025] Figure 3 The connection structure schematic diagram of the centralizing piece provided by the embodiment of the present application is shown in the figure.
[0026] In the figure: 1, inner tube; 11, core taking channel; 111, first channel; 112, second channel; 2, outer tube; 3, centralizing piece; 31, centralizing ring; 32, fixed part; 321, limiting hole; 322, oil injection hole; 323, annular groove; 33, plug-in part; 34, insertion slot; 35, first connecting hole; 36, second connecting hole; 4, steel ball; 5, threaded connecting piece. DETAILED DESCRIPTION
[0027] In order to make the technical problems, technical schemes and beneficial effects of the present application more clearly understood, the following will further describe the present application in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.
[0028] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or indirectly on the other element. It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "top", "bottom", "inner", "outer", and the like, indicate directions or positions based on the directions or positions shown in the drawings and are used for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.
[0029] The terms "first", "second", "third", etc. are used only for descriptive purposes and should not be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "several" is two or more, unless otherwise specifically limited.
[0030] Please refer to Figures 1 to 3 , the core tube for geological drilling provided by the present application will be described. The core tube for geological drilling comprises an inner tube 1, an outer tube 2 and a centralizer 3; the upper end of the inner tube 1 is used to be fixed with a guide drill bit; the inner tube 1 has a coring channel 11 extending along its axial direction and penetrating through the bottom of the inner tube 1, and the coring channel 11 comprises a first channel 111 and a second channel 112 connected in sequence from bottom to top; the outer tube 2 is sleeved outside the inner tube 1 and is used to be fixed with an external body; the centralizer 3 is annularly arranged on the outer circumferential wall of the inner tube 1 and is fixed with the inner tube 1; a plurality of groups of steel balls 4 are arranged on the outer circumferential wall of the centralizer 3 in a circumferential direction, and each steel ball 4 is respectively connected with the inner circumferential wall of the outer tube 2; wherein the first channel 111 has equal diameters, and the second channel 112 has a tapered structure with diameters gradually increasing from bottom to top.
[0031] It should be understood that the guide drill bit is used to drive the inner tube 1 to rotate, so that the coring channel 11 drills the formation core; therefore, the outer tube 2 and the inner tube 1 have relative rotation; in the present application, the steel balls 4 are arranged on the outer circumferential wall of the centralizer 3, the steel balls can freely rotate, cannot move up and down, and do not hinder the flow of drilling fluid; therefore, the relative movement between the inner tube 1 and the outer tube 2 can be avoided, and the centralizing effect of the inner tube 1 can be achieved at the same time.
[0032] Optionally, the diameter of the steel ball 4 is selected as 8mm; after each coring is completed, a new centralizer 3 is replaced.
[0033] Compared with the prior art, the core tube for geological drilling can realize relative movement between the inner tube 1 and the outer tube 2 through the steel ball 4 on the centralizer 3, and keep the inner tube 1 stable, and improve the core taking success rate; and the core taking channel 11 of the inner tube 1 can be designed specifically, and adapt to the fragment expansion deformation force when the core layer moves in the core taking channel 11; specifically, the lower end of the core taking channel 11 is provided with a first channel 111 with equal diameter, so as to adapt to the core which initially enters the core taking channel 11 and has no obvious fragment expansion deformation force, and then the aperture of the second channel 112 gradually increases from bottom to top, so as to provide a proper fragment expansion deformation space for the core entering the deep part of the inner tube 1, and further reduce the internal pressure of the core after fragment expansion, and reduce the resistance of the core continuously entering the inner tube 1, so as to reduce the probability of causing core blocking due to core breaking, improve the core taking success rate, and reduce the core taking operation frequency and time; the core tube for geological drilling provided by the embodiment has simple structure, high adaptability, and does not need to change the original core taking process, and can realize continuous core taking, and greatly reduce the core taking cost of drilling.
[0034] Please refer to Figure 1 In a possible implementation manner, the second channel 112 is divided into multiple taper channels with gradually changed taper angles, and the taper angles of the multiple taper channels gradually increase from bottom to top.
[0035] By arranging the multiple taper channels, a proper fragment expansion deformation space is provided for the core entering the deep part of the inner tube 1; and by increasing the taper angles of the multiple taper channels, the fragment expansion deformation force of the core can be adapted, so as to reduce the resistance of the core continuously entering, avoid reducing the core taking success rate due to core blocking, and save core taking time.
[0036] Please refer to Figure 1 In some embodiments, the taper angles of the multiple taper channels are between 0.015° and 0.03°, and the taper angles of the multiple taper channels gradually increase in an arithmetic progression.
[0037] By controlling the taper angles to be between 0.015° and 0.03°, the core fragment expansion deformation force can be adapted, and the aperture of the taper channel can be prevented from being too large. Further, the taper angles of the multiple taper channels gradually increase in an arithmetic progression, so as to gradually increase the aperture of the taper channel, and adapt to the fragment expansion change rule of the core.
[0038] Specifically, the taper channel is provided with four levels, wherein the taper angle of the first level taper channel is 0.015°, the taper angle of the second level taper channel is 0.02°, the taper angle of the third level taper channel is 0.025°, and the taper angle of the fourth level taper channel is 0.03°.
[0039] Please refer to Figure 1 For example, in the vertical direction, the extension heights of the multiple taper channels are equal, and are twice the extension height of the first channel 111.
[0040] The core crushing deformation force of the core initially entering the core channel 11 gradually emerges after exceeding the range of the first channel 111, and therefore the extension height of the multi-stage tapered channel needs to be adapted step by step. By reasonably setting the height of the first channel 111 and the multi-stage extension channel, the risk of core blocking caused by the core crushing deformation force can be reduced.
[0041] Optionally, the extension height of the first channel 111 is 0.5 m, and the extension height of the multi-stage tapered channel is 1 m.
[0042] Referring to Figure 2 In some possible embodiments, the centralizing member 3 includes a centralizing ring 31 and a plurality of fixing portions 32; the centralizing ring 31 is annularly arranged on the outer peripheral wall of the inner tube 1 and fixed with the inner tube 1; the plurality of fixing portions 32 are arranged at intervals along the circumference of the centralizing ring 31; each fixing portion 32 is provided with a limiting hole 321 facing the inner peripheral wall of the outer tube 2, and a steel ball 4 is arranged in each limiting hole 321.
[0043] The fixing portion 32 is used for facilitating the arrangement of the limiting hole 321 to limit the steel column in the corresponding limiting hole 321; optionally, the limiting hole 321 is a spherical hole, and the volume of the spherical hole is greater than the volume of a hemisphere, so as to ensure that the steel column cannot be separated from the limiting hole 321.
[0044] Referring to Figure 2 In some embodiments, the bottom of each limiting hole 321 is correspondingly provided with an oil injection hole 322, the oil injection hole 322 extends to the inner side wall of the centralizing ring 31 along the radial direction of the centralizing ring 31, and the inner side wall of the centralizing ring 31 is provided with an annular groove 323 in communication with each oil injection hole 322.
[0045] By arranging the oil injection hole 322, lubricating oil can be injected into the limiting hole 321, so as to ensure that the steel column can rotate freely and the relative movement between the inner tube 1 and the outer tube 2 is ensured; by arranging the annular groove 323, lubricating oil can be injected into each limiting hole 321 through the annular groove 323, without adding lubricating oil to each oil injection hole 322 one by one, thereby improving the work efficiency.
[0046] For example, the centralizing ring 31 is an annular structure integrally cut and formed.
[0047] It should be understood that, in order to facilitate the downward drilling of the inner tube 1, part of the outer peripheral wall of the inner tube 1 is also provided with a tapered structure with a gradually increasing radial dimension from bottom to top, and therefore, when the centralizing member 3 is connected with the tapered outer peripheral wall of the inner tube 1, the radial dimension of the centralizing ring 31 can be adjusted to adapt to the size of the tapered outer peripheral wall of the inner tube 1 in the present application, thereby improving the stability of the connection of the centralizing member 3.
[0048] Referring to Figure 2For example, the supporting ring 31 is formed by bending a flat steel at both ends to form a ring structure that is adapted to the outer wall of the inner tube 1, and a threaded connecting piece 5 is arranged between the flat steel and the inner tube 1. One end of the flat steel is provided with a plurality of first connecting holes 35, and the other end of the threaded connecting piece 5 is provided with a second connecting hole 36. The threaded connecting piece 5 passes through the second connecting hole 36 and one of the first connecting holes 35 and is screwed to the inner tube 1.
[0049] By arranging the supporting ring 31 in the form of a ring structure formed by bending a flat steel, the bending curvature of the flat steel can be adapted to the size of the outer tube 2 wall of the inner tube 1, so that the aperture size of the ring structure formed by the flat steel can be easily adjusted. By arranging a plurality of first connecting holes 35, the radial size of the supporting ring 31 can be continuously adjusted when the threaded connecting piece 5 passes through different first connecting holes 35.
[0050] Optionally, the threaded connecting piece 5 is in the form of a rivet or a bolt and a self-locking nut.
[0051] Referring to Figure 2 In some embodiments, one end of the flat steel is provided with a slot 34 that extends inward along the circumference of the supporting ring 31, and the other end of the flat steel is provided with a plug-in part 33 that is adapted to the slot 34. The plug-in part 33 is provided with a plurality of first connecting holes 35, and a second connecting hole 36 is arranged along the radial direction of the supporting ring 31 and penetrates the slot 34.
[0052] By arranging the plug-in part 33 and the slot 34, the two ends of the flat steel can be connected. Specifically, the threaded connecting piece 5 passes through the slot 34 and penetrates one of the second connecting holes 36 and is screwed to the inner tube 1. By adjusting the insertion depth of the plug-in part 33 in the slot 34, the size of the ring structure formed by the supporting ring 3 can be changed to adapt to the size of the outer diameter of the inner tube 1.
[0053] Referring to Figure 3 In some embodiments, the two ends of the flat steel are arranged in front of and behind each other along the radial direction of the supporting ring 31. Specifically, one end of the flat steel is provided with a plurality of first connecting holes 35, and the other end of the threaded connecting piece 5 penetrates the other end of the flat steel and one of the first connecting holes 35 and is screwed to the inner tube 1.
[0054] By arranging the two ends of the flat steel in front of and behind each other along the radial direction of the supporting ring 31, the two ends of the flat steel and the inner tube 1 can be screwed together by the threaded connecting piece 5. The overlapping length of the two ends of the flat steel can be changed to adapt to the change in the outer diameter of the inner tube 1, so as to ensure that the supporting ring 3 abuts against the outer wall of the inner tube 1.
[0055] Referring to Figure 1 In some possible embodiments, a plurality of supporting rings 3 are arranged along the axial direction of the inner tube 1.
[0056] The stability of the inner tube 1 is ensured by arranging a plurality of righting members 3; preferably, two righting members 3 are arranged, and the two righting members 3 are respectively close to upper and lower ends of the inner tube 1. Optionally, the fixed positions of the righting members 3 can be freely adjusted.
[0057] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A core barrel for geological drilling, characterized in that The utility model relates to a coring drill pipe, which comprises: an inner tube (1) having an upper end for fixing with a guide drill bit; the inner tube (1) has a coring channel (11) extending along the axial direction and penetrating through the bottom of the inner tube (1), the coring channel (11) comprises a first channel (111) and a second channel (112) connected in sequence from bottom to top; an outer tube (2) sleeved on the outer tube (1) for fixing with an external machine body; and a centralizer (3) annularly arranged on the outer peripheral wall of the inner tube (1) and fixed with the inner tube (1); the outer peripheral wall of the centralizer (3) is provided with a plurality of groups of steel balls (4) spaced apart along the circumferential direction, and each steel ball (4) is in contact with the inner peripheral wall of the outer tube (2) respectively. The first channel (111) has the same aperture, and the second channel (112) has a tapered structure with the aperture gradually increasing from bottom to top.
2. A core barrel for geological drilling as claimed in claim 1, characterised in that, The second channel (112) is divided into a plurality of tapered channels with gradually changed taper angles, and the taper angles of the plurality of tapered channels gradually increase from bottom to top.
3. A core barrel for geological drilling as claimed in claim 2, characterised in that, The taper angles of the plurality of tapered channels are between 0.015° and 0.03°, and the taper angles of the plurality of tapered channels gradually increase in an arithmetic sequence.
4. A core barrel for geological drilling as claimed in claim 2 or 3, characterised in that, In the vertical direction, the extension heights of the plurality of tapered channels are equal, and each extension height is twice the extension height of the first channel (111).
5. The core barrel for geological drilling as claimed in claim 1, wherein The centralizer (3) comprises: a centralizer ring (31) annularly arranged on the outer peripheral wall of the inner tube (1) and fixed with the inner tube (1); a plurality of groups of fixing portions (32) spaced apart along the circumferential direction of the centralizer ring (31); each fixing portion (32) is provided with a limiting hole (321) arranged towards the inner peripheral wall of the outer tube (2), and one steel ball (4) is arranged in each limiting hole (321).
6. A core barrel for geological drilling as claimed in claim 5, characterised in that The bottom of each limiting hole (321) is provided with an oil injection hole (322) extending to the inner side wall of the centralizer ring (31) along the radial direction of the centralizer ring (31); the inner side wall of the centralizer ring (31) is provided with an annular groove (323) in communication with each oil injection hole (322).
7. A core barrel for geological drilling as claimed in claim 5 or 6, characterised in that, The centralizer ring (31) is formed by bending the two ends of a flat steel inward to form a ring structure matched with the outer peripheral wall of the inner tube (1), and a threaded connecting piece (5) is arranged between the two ends of the flat steel and the inner tube (1); one end of the flat steel is provided with a plurality of first connecting holes (35), the other end of the threaded connecting piece (5) is provided with a second connecting hole (36), the threaded connecting piece (5) penetrates through the second connecting hole (36) and one of the first connecting holes (35), and is screwed and fixed with the inner tube (1).
8. A core barrel for geological drilling as claimed in claim 7, characterised in that, One end of the flat steel is provided with a slot (34) extending inward along the circumferential direction of the centralizer ring (31), and the other end of the flat steel is provided with a plug-in portion (33) matched with the slot (34); the plug-in portion (33) is provided with a plurality of first connecting holes (35), and the second connecting hole (36) penetrates through the slot (34) along the radial direction of the centralizer ring (31).
9. The core barrel for geological drilling as claimed in claim 7, characterized in that, Two ends of the flat steel are arranged in front and back overlap along the radial direction of the centralizing ring (31).
10. The core barrel for geological drilling as claimed in claim 1, characterized in that, The centralizing members (3) are arranged in plurality, and the plurality of centralizing members (3) are arranged in interval along the axial direction of the inner tube (1).