The operational theory and experimental study of scraping-wheel diamond bit

Chen, Lian; Yang, Yingxin; Liu, Yong; Mei, Lin; Zhang, Chunliang; Niu, Shiwei

doi:10.1016/j.petrol.2017.04.043

Cited by 11 publications

(5 citation statements)

References 3 publications

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“…ese new technologies are all helpful in improving rock-breaking efficiency; however, further progress remains to be achieved. Besides, the continuous working of PDC cutters and the concentrically ringed motion trail remain the same [13]. In addition, there is much research on the rock-breaking mechanism of bit.…”

Section: Introductionmentioning

confidence: 98%

Investigation of the Cross‐Cutting Polycrystalline Diamond Compact Bit Drilling Efficiency

Zhang

Yang

Ren

et al. 2021

Shock and Vibration

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The parallel track scraping principle of conventional PDC bits largely limits the cutting efficiency and working life in deep formations. Cross-cutting polycrystalline diamond compact (PDC) bit may be an efficient drilling tool that increases the rock-breaking efficiency through both cross-cutting and alternate-cutting modes of the PDC cutter. The motion track equation of the cross-cutting PDC bit was derived by using the compound coordinate system, and the motion track was analyzed. Meanwhile, through the unit experiment and discrete element simulation, the cutting force, volume-specific load, and crack propagation were analyzed under different cutting modes. Through establishing a nonlinear dynamic model of the bit-rock system, the speed-up mechanism of the novel bit was analyzed based on rock damage, rock stress state, and motion characteristic of the bit during the rock-breaking process. Compared with unidirectional cutting, cross-cutting produces less cutting force, more brittle fracture, and a greater decrease of formation strength. The novel PDC bit can put more rock elements into a tensile stress condition than a conventional PDC bit, and the plastic energy dissipation ratio of the cross-cutting PDC bit is lower while the damage energy consumption ratio is higher than they are for conventional bits, which is beneficial to increasing the ratio of fracture failure and improving rock-breaking efficiency. Laboratory drilling tests show that the cross-cutting PDC bit can create mesh-like bottom-hole features. Drilling contrast experiments show that a mesh-like bottom-hole pattern can be obtained by using the cross-cutting PDC bit, of which the ROP is obviously higher than that of the conventional bit when drilling in sandstone or limestone formation. Meanwhile, the influence of deviation angle, weight on bit, and rock properties on cutting efficiency of the cross-cutting PDC bit are studied.

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Section: Introductionmentioning

confidence: 98%

Investigation of the Cross‐Cutting Polycrystalline Diamond Compact Bit Drilling Efficiency

Zhang

Yang

Ren

et al. 2021

Shock and Vibration

Self Cite

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“…In summary, for rock breaking and vibration reduction of PDC bits, it is proposed at home and abroad to use graphene instead of polycrystalline diamond composite sheets in terms of materials to enhance the impact resistance of the cutters, and to reduce the bit failure caused by vibration by changing the cutting structure of the bit or setting a buffer device in terms of structure [14][15][16][17][18][19][20][21][22][23][24][25][26][27] . In this paper, the idea of local accurate vibration reduction, also known as flexible vibration reduction cutting technology, is proposed.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on PDC single-tooth flexible vibration reduction effect

Haitao,

Zhou,

Jia

et al. 2023

Preprint

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In oil and gas drilling engineering, when PDC bit is drilled into inhomogeneous strata, soft and hard alternating strata, and directional drilling and other complex working conditions, it often encounters frequent impact loads, resulting in abnormal failure accidents, which greatly reduces the performance of the bit. The technical concept of flexible cutting rock breaking is to reduce the stiffness by setting elastic elements, reduce the impact load amplitude suffered in the cutting process to a certain range, and achieve the purpose of extending the service life of the bit. The effects of cutting depth, rake angle and disc spring series combination on the damping effect of flexible damping unit are analyzed through experiments on limestone. The results show that the flexible vibration reduction cutting can effectively reduce the peak cutting load and load fluctuation by 20%~35%. When the flexible tolerance ratio is near 67.6%, the flexible vibration damping effect is the best. The effect of flexible vibration reduction is positively correlated with the combined stiffness of the disc spring and the rake angle. The optimum stiffness combination of the elastic elements is 2 A-type disc springs in series and the optimum rake angle is 15°.

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“…In this circumstance, the cutter needs a large cutting force to remove the rock, and once the cutter is worn, curvature of the cutting edge will be rapidly increased so that contact stress between the cutter and rock will be sharply deceased, meaning that the penetrating ability of the cutter be significantly decreased. [4][5][6][7] The cross-track cutting method is a new concept put forward in recent years, [8][9][10] which is able to increase the drilling efficiency of the bit working in deep formation that is of poor drillability. First, cross-track cutting makes the bottom-hole a non-smooth one, which is beneficial to release the interior stress in mesoscopic rock protrusions so as to lower the shear strength of the rock.…”

Section: Introductionmentioning

confidence: 99%

Research on working principle and cross-track cutting characteristic of the axis-tilted rock-breaking tool

Ren

Yang

Zhou

et al. 2019

Advances in Mechanical Engineering

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Concentric-track cutting method of a conventional polycrystalline diamond compact bit makes the bit suffer from inadequate rock-penetrating capacity and severely hinders the improvement of rock-breaking efficiency. Nevertheless, crosstrack cutting method is already proved to be an effective way to improve the penetrating ability of the bit. Accordingly, a novel rock-breaking tool with tilted rotating axis is put forward in this article. In this research, first, the structural characteristics of the rock-breaking tool with tilted rotating axis are introduced in detail, relation equations of key geometric parameters of the bit are established, and coordinates of the feature points of the cutters are represented. Second, tracks and motion tendency of the cutters in different areas, as well as the bottom-hole coverage pattern, are respectively analyzed, and the influences of different factors on cutter motion are compared. Third, corresponding indoor experiment is conducted to research the influences of revolution/rotation ratio and axis-tilt angle on drilling efficiency, and the rock particles are compared to reveal the rock-breaking mechanism of the tool. This research is intended to provide basic theoretical support for the engineering application of the tool and is of certain referential significance to improving the rock-breaking efficiency in formations of poor drillability.

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The operational theory and experimental study of scraping-wheel diamond bit

Cited by 11 publications

References 3 publications

Investigation of the Cross‐Cutting Polycrystalline Diamond Compact Bit Drilling Efficiency

Investigation of the Cross‐Cutting Polycrystalline Diamond Compact Bit Drilling Efficiency

Experimental study on PDC single-tooth flexible vibration reduction effect

Research on working principle and cross-track cutting characteristic of the axis-tilted rock-breaking tool

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