Numerical study on optimal impact angle of a single PDC cutter in impact rock cutting

Liu, Shubin; Ni, Hongjian; Zhang, Heng; Wang, Yong; Li, Ning; Lyu, Jiaxue; Xie, Hao

doi:10.1016/j.egyr.2021.06.076

Cited by 12 publications

(3 citation statements)

References 25 publications

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“…To determine the frequency of inflow fluctuations, the frequency of flow fluctuations at the exit of the PDM is calculated by using the following equation: fluctuation frequency = rotor rotation frequency × (the number of rotor blades + 1) (11) Table 1 lists the parameters of a certain type of PDM with an outer diameter of 197mm. Based on the parameters of the PDM, the fluctuation frequency under the flow rate condition is calculated and presented in Table 2.…”

Section: 𝜇 = (𝐶 𝛥) 𝑆mentioning

confidence: 99%

“…When the cutting depth is greater than a certain value, the rock-breaking speed increases rapidly and enters into a different mode. Studies [11][12][13] of rock fracture mechanics show that impact loads can improve the rate of crack growth, which is the important difference between an impact load and a static load. The impact load can easily enter into the second rock-breaking mode, which is the rapid rock-breaking mode.…”

Section: Introductionmentioning

confidence: 99%

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Study on the Influence of Fluid Pulsation on Hydraulic Impactor Performance in Drilling Engineering

Cui

Xiao

et al. 2023

Processes

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The combination of the hydraulic impactor and positive displacement motor (PDM) is becoming more and more popular in drilling engineering. However, the negatives of the PDM on the impactor cannot be ignored. To improve the performance of the technique, the influence of fluid pulsation from the PDM on the hydraulic impactor was studied first; then, the structure of the impactor was optimized to improve its impact force; finally, field tests were carried out in 2 wells in the shallow formation. The results indicate that the fluid fluctuation generated in the PDM can restrain the performance of the impactor, and that the impact force can be increased by 24.4% to 28.6% through the optimization of design. Field tests show that this technique can further improve the drilling efficiency and rotating stability of the polycrystalline diamond compact bit, and that the rate of penetration and bit footage increase by 32.5% and 34.6%, respectively. In the study, the effect of inlet fluid fluctuation on the performance of the hydraulic impactor was studied using the computational fluid dynamics method. This is unlike other studies that have mostly considered the inlet fluid as a steady flow. Furthermore, the performance of the combine used of the impactor and PDM can be improved through structural optimization.

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Section: 𝜇 = (𝐶 𝛥) 𝑆mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on the Influence of Fluid Pulsation on Hydraulic Impactor Performance in Drilling Engineering

Cui

Xiao

et al. 2023

Processes

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“…14 Among them, FEM is the most commonly employed method to simulate rock cutting and crushing. Liu et al 15 studied the influence of impact angle on the rock breaking effect of cutters by using the FEM. Saksala 16 analyzed the influence of hydrostatic and confining pressure on percussive drilling of hard rock.…”

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confidence: 99%

Research on discrete element modeling and numerical simulation of cutting rock behavior under impact load

Zhang

Huang

et al. 2022

Energy Science & Engineering

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Combining well-drilling hammers with polycrystalline diamond compact bits to break rock under cutting load and impact load is an effective way to improve drilling efficiency. Although impact load can enhance the cutting efficiency of the cutter, excessive impact can also cause the cutter to be subjected to additional vibrations, which can decrease its working life. Knowledge of laws governing the changes in the cutting force of the cutter under impact load is essential for the design and selection of well-drilling hammers. Based on rock scratch tests and finite element rock cutting model, a discrete element modeling (DEM) rock cutting model was established to analyze the rock breaking and cutting force. Then, the material parameters of rock samples were determined, and the simulation parameters were corrected.Finally, a DEM rock cutting model under an impact load was established. The results showed that when there was an obvious difference between the average cutting force and mean peak cutting force, which corresponded to the rockbreaking transition from ductile to brittle, with introduction of the impact load leading to an earlier transition. The cutting force variance was proportional to the impact amplitude, and the increase in the cutting force variance became more obvious when the static load exceeded the critical transition weight.When the ratio of the impact amplitude to the static load was greater than 50%, the mean and variance of the cutting force increased rapidly. Under the same impact amplitude, the impact frequency had little effect on the average cutting force, but a higher frequency could significantly reduce the variance of the cutting force under a high static load (i.e., it could alleviate the fluctuation of the cutting force). These results provide a reference for the selection of welldrilling hammers and optimization of the impact load. K E Y W O R D S discrete element modeling, impact drilling, PDC bit, rock cutting force, well-drilling hammer

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Experimental and Modeling Study on the Master Mechanism of BHA Movement States

Chen

et al. 2023

Springer Series in Geomechanics and Geoengineering

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Numerical study on optimal impact angle of a single PDC cutter in impact rock cutting

Cited by 12 publications

References 25 publications

Study on the Influence of Fluid Pulsation on Hydraulic Impactor Performance in Drilling Engineering

Study on the Influence of Fluid Pulsation on Hydraulic Impactor Performance in Drilling Engineering

Research on discrete element modeling and numerical simulation of cutting rock behavior under impact load

Experimental and Modeling Study on the Master Mechanism of BHA Movement States

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