PDC for maintaining the course

Abstract

A kind of poly crystalline diamond compact for keeping range, including hard alloy layer, the end of hard alloy layer is fixed diamond layer, diamond layer includes recessed, circular central part and annular mountain-shaped edge portion, edge portion completely surrounds central part. The end surface of edge portion is staggered with two to six high peak areas and two to six low peak areas, and low peak area becomes the passage of circulating medium into central part. Relative to the prior art, the technical effect of the utility model is that the utility model is provided with recessed central part, which can accelerate heat dissipation, maintain its own performance, and is convenient for use in deep formation rock hard, strong grinding, accompanied by extreme conditions such as high temperature and high pressure.

Description

Technical Field

[0001] This utility model belongs to the field of diamond technology, specifically relating to a polycrystalline diamond composite sheet for diameter protection. Background Technology

[0002] In recent years, with the advancement of oil exploration and development into deeper areas, and the continued exploration and development of deep oil and gas resources, geothermal resources, and solid mineral resources, drilling work has faced unprecedented challenges. Deep formations are characterized by hard, highly abrasive rocks, coupled with extreme conditions such as high temperature and high pressure, making it difficult for conventional polycrystalline diamond composite (PDC) sheets to meet development requirements in terms of strength and other properties.

[0003] Against this backdrop, the design of irregularly shaped polycrystalline diamond composite sheets for specific geological formations has become one of the solutions to the challenges of deep drilling due to their unique structure and performance advantages. Utility Model Content

[0004] The technical problem to be solved by this utility model is: how to design a polycrystalline diamond composite sheet for diameter protection to improve its own strength.

[0005] The specific technical solution of this utility model is as follows: A polycrystalline diamond composite sheet for diameter protection includes a cemented carbide layer, with a diamond layer fixed at the end of the cemented carbide layer. The diamond layer includes a recessed, circular center portion and a crater-shaped edge portion, with the edge portion completely surrounding the center portion.

[0006] The edge end face has two to six peak areas and two to six low peak areas that are staggered, with the low peak areas serving as channels for the circulating medium to enter the center.

[0007] The edge end face has three peak areas and three low peak areas that are staggered, and the three peak areas are evenly distributed.

[0008] The outer slope of the edge gradually shrinks towards the center as it moves away from the hard alloy layer.

[0009] The edges transition smoothly from the outer slope to the top surface and then to the inner slope.

[0010] The peak area itself, as well as the transition area between it and the low peak area, transition smoothly.

[0011] The low-peak zone is an arc-shaped wall, which is formed by gradually stacking a certain cross section along the edge of the diamond layer in the circumference; the high-peak zone is a symmetrical spatial figure, whose symmetry plane is a vertical plane passing through the "straight line connecting the center of the circle in the center and the highest point of the high-peak zone", and gradually rises smoothly from the transition zone to the highest point of the high-peak zone.

[0012] The following relationship must be satisfied: The ratio of the central area to the bottom area of ​​the diamond layer is 1 / 2 to 1 / 3; The ratio of h to H is between 0.4 and 0.6; The ratio of d to (Hh) is between 1 / 3 and 1 / 4.

[0013] in: h: The height of the center is the distance from the outer end face of the center to the bottom surface of the diamond layer; H: The height of the highest point in the peak area is the distance from the highest point in the peak area to the bottom of the diamond layer; d: The relative height of the low-peak area is the distance from the low-peak area to the outer end face of the center.

[0014] Compared with the prior art, the technical effect of this utility model is that it has a recessed central part, which can accelerate heat dissipation, maintain its own performance, and is convenient for use in deep strata rocks that are hard and highly abrasive, and are accompanied by extreme conditions such as high temperature and high pressure. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the present invention.

[0016] Figure 2 This is a cross-sectional schematic diagram of the present invention.

[0017] Figure 3 yes Figure 2 A three-dimensional schematic diagram. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0019] like Figure 1-3 A polycrystalline diamond composite sheet for diameter protection includes a cemented carbide layer 10, with a diamond layer 20 fixed to the end of the cemented carbide layer 10. The diamond layer 20 includes a recessed, circular center portion 21 and a crater-shaped edge portion 22, with the edge portion 22 completely surrounding the center portion 21.

[0020] To facilitate heat dissipation and the entry of circulating medium, the end face of the edge portion 22 has two to six peak areas 221 and two to six low peak areas 222 staggered, with the low peak areas 222 serving as channels for the circulating medium to enter the central portion 21.

[0021] Preferably, the end face of the edge portion 22 has three peak regions 221 and three low peak regions 222 that are staggered, and the three peak regions 221 are evenly distributed.

[0022] To minimize wear, the outer slope 23 of the edge 22 gradually shrinks towards the center as it moves away from the hard alloy layer 10.

[0023] To minimize sharp edges and wear, the edge 22 transitions smoothly from the outer slope 23 to the top surface and then to the inner slope 24.

[0024] To minimize sharp edges and wear, the peak area 221 itself and the transition area 25 between it and the low peak area 222 are smoothly transitioned.

[0025] The low-peak region 222 is similar to an arc wall, which is obtained by gradually stacking a certain cross section along the circumference at the edge of the diamond layer 20; Peak area 221 is a symmetrical spatial figure. Its symmetry plane is a vertical plane passing through the "straight line connecting the center of the central part 21 and the highest point of peak area 221", and it gradually rises smoothly from transition area 25 to the highest point of peak area 221.

[0026] If the edge is too high, it will wear out severely; if the edge is too low, the concave advantage of the center cannot be shown. Therefore, the following relationship needs to be satisfied: The ratio of the area of ​​the central part 21 to the bottom surface area of ​​the diamond layer 20 (the end surface area of ​​the end connected to the cemented carbide layer 10) is 1 / 2 to 1 / 3. The ratio of h to H is between 0.4 and 0.6; The ratio of d to (Hh) is between 1 / 3 and 1 / 4.

[0027] in: h: The height of the central part 21 is the distance from the outer end face of the central part 21 to the bottom surface of the diamond layer 20; H: The height of the highest point of peak zone 221 is the distance from the highest point of peak zone 221 to the bottom surface of diamond layer 20; d: The relative height of the low peak area 222 is the distance from the low peak area 222 to the outer end face of the central part 21.

[0028] Its working principle is as follows: During operation, as the drill bit rotates continuously, the diamond layer 20 will rub against the rock / formation. Due to the intense friction, the temperature of the diamond layer 20 will continue to rise, and the diamond layer 20 itself will also expand. At this time, the central part 21 provides space for this expansion. Meanwhile, the liquid circulating medium continuously enters the central part 21 from the low peak area 222, which can carry away some energy and prevent the diamond layer 20 from overheating.

[0029] In particular, the outer end face of the diamond layer 20 has a complex curved surface, which has a large contact area with the liquid circulating medium, facilitating heat exchange and preventing the diamond layer 20 from overheating.

[0030] Features of this application: S1. The thickness of the diamond composite layer in this design is one of the guarantees for improving the wear resistance of the product. The shape and structure of the protrusions in S2 and peak area 221 have been optimized to better resist wear during grinding, and the smaller the top angle, the higher its impact resistance.

[0031] The continuous curvature transition of the S3 and peak area 221 surface is the core of uniform stress distribution. When subjected to vertical pressure, the load will diffuse along the principal curvature direction of the surface, avoiding stress concentration at sharp corners. The surface itself has good structural strength; the cylindrical surface can withstand axial and radial loads, and the top surface exhibits relatively uniform stress distribution when subjected to vertical pressure.

[0032] The effect of S4 and the low-peak region 222 on stress is essentially "stress concentration caused by geometric discontinuity". The core of its optimization lies in using smooth geometry to weaken the stress peak.

[0033] For other details, please refer to the existing technology.

[0034] The above description is only a preferred embodiment of the present utility model. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present utility model, and these should also be considered within the protection scope of the present utility model.

Claims

1. A polycrystalline diamond composite sheet for diameter protection, comprising a cemented carbide layer (10), wherein a diamond layer (20) is fixed to the end of the cemented carbide layer (10), characterized in that: The diamond layer (20) includes a recessed, circular center (21) and a crater-shaped edge (22), with the edge (22) completely surrounding the center (21).

2. The polycrystalline diamond composite sheet for diameter protection as described in claim 1, characterized in that: The edge portion (22) has two to six peak areas (221) and two to six low peak areas (222) staggered on the end face, and the low peak areas (222) become the channel for the circulating medium to enter the central portion (21).

3. The polycrystalline diamond composite sheet for diameter protection as described in claim 2, characterized in that: The edge portion (22) has three peak areas (221) and three low peak areas (222) interspersed on the end face, and the three peak areas (221) are evenly distributed.

4. The polycrystalline diamond composite sheet for diameter protection as described in claim 3, characterized in that: The outer slope (23) of the edge (22) gradually shrinks towards the center as it moves away from the hard alloy layer (10).

5. The polycrystalline diamond composite sheet for diameter protection as described in claim 4, characterized in that: The edge (22) transitions smoothly from the outer slope (23), to the top surface, and then to the inner slope (24).

6. The polycrystalline diamond composite sheet for diameter protection as described in claim 5, characterized in that: The peak area (221) itself and the transition area (25) between it and the low peak area (222) are both smoothly transitioned.

7. The polycrystalline diamond composite sheet for diameter protection as described in claim 6, characterized in that: The low peak area (222) is an arc-shaped wall, which is obtained by gradually stacking a certain cross section along the circumference at the edge of the diamond layer (20); The peak area (221) is a symmetrical spatial figure. Its symmetry plane is a vertical plane passing through the "straight line connecting the center of the central part (21) and the highest point of the peak area (221)," and gradually rises smoothly from the transition area (25) to the highest point of the peak area (221).

8. The polycrystalline diamond composite sheet for diameter protection as described in claim 7, characterized in that: The following relationship must be satisfied: The ratio of the area of ​​the central part (21) to the bottom area of ​​the diamond layer (20) is 1 / 2 to 1 / 3; The ratio of h to H is between 0.4 and 0.6; The ratio of d to (Hh) is between 1 / 3 and 1 / 4; in: h: The height of the central part (21) is the distance from the outer end face of the central part (21) to the bottom surface of the diamond layer (20); H: The height of the highest point of the peak area (221) is the distance from the highest point of the peak area (221) to the bottom surface of the diamond layer (20); d: The relative height of the low peak area (222) is the distance from the low peak area (222) to the outer end face of the center (21).

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