US 12,359,510 B2
Bit cutting structure and PDC bit for highly abrasive formations
Xiangchao Shi, Chengdu (CN); Zhaowei Wang, Chengdu (CN); Yun Zhuo, Chengdu (CN); Ye Jiao, Chengdu (CN); Rongrong Wang, Chengdu (CN); and Zonglin Lyu, Chengdu (CN)
Filed by SOUTHWEST PETROLEUM UNIVERSITY, Chengdu (CN)
Filed on Sep. 9, 2024, as Appl. No. 18/828,472.
Claims priority of application No. 202311756192.4 (CN), filed on Dec. 20, 2023.
Prior Publication US 2025/0207464 A1, Jun. 26, 2025
Int. Cl. E21B 10/26 (2006.01); E21B 10/46 (2006.01)
CPC E21B 10/26 (2013.01) [E21B 10/46 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A cutting structure for a PDC bit, comprising: A-type cutting structures and B-type cutting structures, wherein the A-type cutting structures and the B-type cutting structures are each composed of a front-row integrated compact and a rear-row;
the front-row integrated compact and the rear-row of a conical tooth of each of the A-type cutting structures are arranged on an inner cone part of the PDC bit, and the front-row integrated compact and the rear-row of each of the B-type cutting structures are arranged on a curvature part of the PDC bit;
wherein;
a cross section of the front-row integrated compact is a rectangle, a width of the rectangle is L2, and a height of the rectangle is H2+H3; a tooth surface of the front-row is provided with a groove; a length of a bottom of a cross section of the groove is L1, and a height of the cross section of the groove is H1, wherein H1≤H2/2, L1≤⅙×L2, and a length of L2 is 13.44 mm-25 mm;
the front-row integrated compact comprises a polycrystalline diamond layer and a cemented carbide layer, and the polycrystalline diamond layer is fixedly connected to a top end of the cemented carbide layer;
wherein H2 represents a thickness of the polycrystalline diamond layer and H3 represents a thickness of the cemented carbide layer,
wherein an exposure height ΔL1 of the front-row integrated compact between a blade radial line and a radial tooth distribution line of the tooth position of the front-row integrated compact, and a height difference ΔL2 between the front-row integrated compact and the rear-row is formed between the radial tooth distribution line of the tooth position of the front-row integrated compact and a radial tooth distribution line of the tooth position of the rear-row, and wherein 0≤ΔL2/ΔL1≤0.5, and wherein the height difference ΔL2 can be increased to make the unconfined rock ridge higher, so as to improve the crushing efficiency of the integrated compact cutting rock ridge;
wherein in an event of occurrence of ring out phenomenon on the PDC bit the B-type cutting structures are arranged on nose and shoulder parts of a PDC bit body, in an event of occurrence of coring phenomenon on the PDC bit the A-type cutting structures are arranged on the inner cone part of the PDC bit body, and in an event of occurrence of the ring out phenomenon and the coring phenomenon simultaneously, the A-type cutting structures and the B-type cutting structures are simultaneously arranged on the bit body.