A Skeleton Cage-Type High-Strength Diamond Core Bit Matrix Block and Its Manufacturing Method

Abstract

The present invention discloses a matrix cage type high-strength diamond coring bit matrix block and a manufacturing method thereof. The matrix block part includes a matrix block body and a matrix cage. The matrix cage is internally disposed in the matrix block body. The matrix cage is manufactured according to the designed size of the diamond matrix block, and the size of the matrix cage is slightly smaller than the designed size of the matrix block. Then, the matrix cage is placed in a matrix block mold, and the mixed diamond matrix block formula powder is added into the matrix cage and evenly filled therein. After that, sintering is carried out under certain temperature and pressure conditions. Compared with ordinary matrix blocks, the matrix cage type matrix block has an integral skeleton structure, and its overall strength is higher and it is not easy to break.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling coring, and particularly relates to a skeleton cage type high-strength diamond coring bit matrix block and a manufacturing method thereof. Background Art

[0002] China's hot dry rock resources have the advantages of wide distribution area, large resource potential and high economic value. China has called for vigorously developing the development and utilization of clean energy resources to promote the realization of the carbon peak and carbon neutrality goals. As a clean and environment-friendly energy resource, the National Energy Administration has proposed to carry out geothermal power generation demonstrations and support hot dry rock power generation.

[0003] Drilling coring is one of the effective methods to obtain underground original data. However, due to the hard, abrasive and high-temperature formation of hot dry rock, when using an impregnated diamond coring bit to core in a high-temperature granite formation, the cutting matrix block often wears severely or even breaks and falls into the well. The breakage of the matrix block, on the one hand, causes uneven stress on the bottom lip surface of the coring bit, which aggravates the wear of the bit and causes disturbance to the core in the core barrel, affecting the coring efficiency and core quality; on the other hand, the diamond matrix block that has fallen to the bottom of the well needs to be further salvaged or ground, otherwise it will have an adverse impact on the subsequent normal drilling roller bit or PDC bit.

[0004] Therefore, designing a high-strength diamond coring bit matrix block to avoid the matrix block from breaking and falling into the well during coring drilling is of great significance for hot dry rock drilling and even oil drilling coring operations, and can greatly reduce the downhole operation costs such as secondary coring and matrix block treatment caused by matrix block breakage. The root cause of the matrix block breakage is still the insufficient overall structural strength. The matrix block formed by high-temperature sintering is in a high-temperature environment during welding operation, and the internal materials of the matrix block may undergo physical melting or chemical reaction again under the action of high temperature, resulting in changes in its structure and overall strength. Summary of the Invention

[0005] The purpose of the present invention is to provide a skeleton cage type high-strength diamond coring bit matrix block and a manufacturing method thereof, and solve the problem of easy breakage of the diamond matrix block of the coring bit during the implementation of coring drilling, especially during coring drilling in high-temperature hard rock formations such as hot dry rock.

[0006] To achieve the above purpose, the present invention provides the following solution: The present invention provides a skeleton cage type high-strength diamond coring bit matrix block, including

[0007] a matrix block body, which is installed on the coring bit; and

[0008] a skeleton cage, which is placed inside the matrix block body, and the size of the skeleton cage is smaller than that of the matrix block body.

[0009] In one embodiment, the matrix body is sintered from diamond matrix powder.

[0010] In one embodiment, the framework beam includes an upper framework beam and a lower framework beam, and the bottom end of the upper framework beam is welded to the lower framework beam.

[0011] In one embodiment, the upper framework beam includes an upper arc-shaped framework beam, an upper transverse framework beam, and a longitudinal framework beam. A plurality of the upper transverse framework beams are welded at equal intervals between two adjacent upper arc-shaped framework beams at the same height. At the bottom of the welding point of the upper arc-shaped framework beam and the upper transverse framework beam, a vertical longitudinal framework beam is also welded; the bottom end of the longitudinal framework beam is welded to the lower framework beam.

[0012] In one embodiment, the upper framework beam includes multiple groups of the upper arc-shaped framework beams, and each group of the upper arc-shaped framework beams is arranged at different horizontal heights at equal intervals from top to bottom; the longitudinal framework beam connects each group of the upper arc-shaped framework beams from top to bottom in sequence and then is welded to the lower framework beam.

[0013] In one embodiment, the lower framework beam includes a lower straight framework beam and a lower transverse framework beam; a plurality of the lower transverse framework beams are welded at equal intervals between two adjacent lower straight framework beams at the same height, and the bottom end of the longitudinal framework beam is welded to the two end points of the lower transverse framework beam on the lower straight framework beam.

[0014] In one embodiment, the lower framework beam includes multiple groups of the lower straight framework beams, and each group of the lower straight framework beams is arranged at different horizontal heights at equal intervals from top to bottom; the longitudinal framework beam connects each group of the upper arc-shaped framework beams from top to bottom in sequence and then connects each group of the lower straight framework beams in sequence by welding.

[0015] The present invention also provides a method for manufacturing a matrix of a framework cage type high-strength diamond coring bit, which is applied to the matrix of the framework cage type high-strength diamond coring bit described above, and includes the following steps:

[0016] First, a framework cage is manufactured according to the design size of the diamond matrix. The size of the framework cage is smaller than the design size of the matrix; then, the framework cage is placed in a matrix mold, and the mixed diamond matrix formula powder is added into the framework cage and evenly filled; then sintering is carried out under set temperature and pressure conditions to form a matrix of a framework cage type high-strength diamond coring bit.

[0017] The present invention has achieved the following beneficial technical effects compared with the prior art:

[0018] The matrix cage type high-strength diamond coring bit matrix block and its manufacturing method in the present invention. The matrix block part includes a matrix block body and a matrix cage. The matrix cage is built inside the matrix block body. The matrix cage is made according to the designed size of the diamond matrix block, and the size of the matrix cage is slightly smaller than the designed size of the matrix block. Then, the matrix cage is placed in a matrix block mold, and the mixed diamond matrix block formula powder is added into the matrix cage and evenly filled. After that, sintering is carried out under certain temperature and pressure conditions. Compared with ordinary matrix blocks, the matrix cage type matrix block has an integral framework structure, and its overall strength is higher and it is not easy to break. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a structural diagram of an ordinary matrix block;

[0021] Figure 2 It is a bottom view of the internal structure of the matrix cage type high-strength diamond coring bit matrix block in the embodiment of the present invention;

[0022] Figure 3 It is a side view of the matrix cage body inside the matrix block;

[0023] Figure 4 It is a schematic diagram of the overall structure of the matrix cage;

[0024] Among them, 1 - diamond matrix block; 2 - matrix cage; 11 - diamond matrix block powder; 21 - upper arc-shaped framework beam; 22 - lower straight framework beam; 23 - upper transverse framework beam; 24 - longitudinal framework beam. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0026] The purpose of the present invention is to provide a matrix cage type high-strength diamond coring bit matrix block and its manufacturing method, which solves the problem that the diamond matrix block of the coring bit is easy to break during the implementation of coring drilling, especially when coring and drilling in high-temperature hard rock formations such as hot dry rock.

[0027] To make the above objects, features, and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] As Figures 1 - 4 shown, the present invention provides a matrix cage type high-strength diamond coring bit matrix block, including

[0029] a matrix block body, which is installed on the coring bit; and

[0030] a matrix cage 2, which is built into the matrix block body, and the size of the matrix cage 2 is smaller than that of the matrix block body.

[0031] In one embodiment, the matrix block body is sintered from diamond matrix powder 11.

[0032] In one embodiment, the matrix beams include an upper matrix beam and a lower matrix beam, and the bottom end of the upper matrix beam is welded to the lower matrix beam.

[0033] In one embodiment, the upper matrix beam includes an upper arc matrix beam 21, an upper transverse matrix beam 23, and a longitudinal matrix beam 24. A plurality of upper transverse matrix beams 23 are welded at equal intervals between two adjacent upper arc matrix beams 21 at the same height. A vertical longitudinal matrix beam 24 is also welded at the bottom of the welding point of the upper arc matrix beam 21 and the upper transverse matrix beam 23; the bottom end of the longitudinal matrix beam 24 is welded to the lower matrix beam. The upper arc matrix beam 21 is an arc structure bent downward, and the design of this arc conforms to the shape of the diamond matrix 1. Preferably, the radian of the upper arc matrix beam 21 is also the same as the outer radian of the diamond matrix 1.

[0034] In one embodiment, the upper matrix beam includes multiple groups of upper arc matrix beams 21, and each group of upper arc matrix beams 21 is arranged at different horizontal heights at equal intervals from top to bottom; the longitudinal matrix beam 24 connects each group of upper arc matrix beams 21 from top to bottom in sequence and then welds to the lower matrix beam.

[0035] In one embodiment, the lower matrix beam includes a lower straight matrix beam 22 and a lower transverse matrix beam; a plurality of lower transverse matrix beams are welded at equal intervals between two adjacent lower straight matrix beams 22 at the same height, and the bottom end of the longitudinal matrix beam 24 is welded to the two end points of the lower transverse matrix beam on the lower straight matrix beam 22.

[0036] In one embodiment, the lower matrix beam includes multiple groups of lower straight matrix beams 22, and each group of lower straight matrix beams 22 is arranged at different horizontal heights at equal intervals from top to bottom; the longitudinal matrix beam 24 connects each group of upper arc matrix beams 21 from top to bottom in sequence and then connects and welds each group of lower straight matrix beams 22 in sequence.

[0037] As above Figure 1Shown is a common diamond matrix block 1, which is mainly sintered from uniformly mixed diamond powders of different particle sizes and proportions and other alloy material powders under certain temperature and pressure conditions.

[0038] The present invention also provides a method for manufacturing a skeleton cage type high-strength diamond coring bit matrix block, which is applied to the above-mentioned skeleton cage type high-strength diamond coring bit matrix block, and includes the following steps:

[0039] First, a skeleton cage 2 is manufactured according to the designed dimensions of the diamond matrix block. The size of the skeleton cage 2 is slightly smaller than the designed size of the matrix block. Then, the skeleton cage 2 is placed in a matrix block mold, and the mixed diamond matrix block formula powder is added into the skeleton cage 2 and evenly filled, and then sintered under certain temperature and pressure conditions. Compared with the common matrix block, the skeleton cage type matrix block has an integral skeleton structure, and its overall strength is higher and it is not easy to break.

[0040] The entire skeleton cage 2 is made of a high-strength metal material, such as steel bars, etc., so as to improve the overall structural strength of the diamond matrix block 1.

[0041] It should be noted that for those skilled in the art, obviously the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention, and any reference signs in the claims should not be regarded as limiting the claims involved.

[0042] Specific examples are used in the present invention to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A matrix cage type high-strength diamond coring bit matrix, characterized in that: It includes a matrix body, and the matrix body is installed on the coring bit; and a cage, the cage is placed inside the matrix body, and the size of the cage is smaller than the size of the matrix body; The cage beam includes an upper cage beam and a lower cage beam, and the bottom end of the upper cage beam is welded to the lower cage beam; the upper cage beam includes an upper arc cage beam, an upper horizontal cage beam and a longitudinal cage beam, and a plurality of the upper horizontal cage beams are welded at equal intervals between two adjacent upper arc cage beams at the same height, and a vertical longitudinal cage beam is also welded at the bottom of the welding point of the upper arc cage beam and the upper horizontal cage beam; the bottom end of the longitudinal cage beam is welded to the lower cage beam.

2. The matrix cage type high-strength diamond coring bit matrix according to claim 1, characterized in that: The matrix body is sintered from diamond matrix powder.

3. The matrix cage type high-strength diamond coring bit matrix according to claim 1, characterized in that: The upper cage beam includes multiple groups of the upper arc cage beams, and each group of the upper arc cage beams is arranged at equal intervals at different horizontal heights from top to bottom; the longitudinal cage beam connects each group of the upper arc cage beams from top to bottom in sequence and then welds to the lower cage beam.

4. The matrix cage type high-strength diamond coring bit matrix according to claim 3, characterized in that: The lower cage beam includes a lower straight cage beam and a lower horizontal cage beam; a plurality of the lower horizontal cage beams are welded at equal intervals between two adjacent lower straight cage beams at the same height, and the bottom end of the longitudinal cage beam is welded to the two end points of the lower horizontal cage beam on the lower straight cage beam.

5. The matrix cage type high-strength diamond coring bit matrix according to claim 4, characterized in that: The lower cage beam includes multiple groups of the lower straight cage beams, and each group of the lower straight cage beams is arranged at equal intervals at different horizontal heights from top to bottom; the longitudinal cage beam connects each group of the upper arc cage beams from top to bottom in sequence and then connects each group of the lower straight cage beams in sequence by welding.

6. A manufacturing method of a matrix cage type high-strength diamond coring bit matrix, which is applied to the matrix cage type high-strength diamond coring bit matrix according to any one of claims 1-5, characterized in that, it includes the following steps: First, a cage is manufactured according to the designed size of the diamond matrix, and the size of the cage is smaller than the designed size of the matrix; then, the cage is placed in a matrix mold, and the mixed diamond matrix powder is added into the cage and evenly filled; then sintering is carried out under the set temperature and pressure conditions to form a matrix cage type high-strength diamond coring bit matrix.

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