A novel method for measuring and analyzing the interaction between drill bit and rock

Wang, Xu; Wang, Zhenquan; Wang, Deguo; Chai, Lu

doi:10.1016/j.measurement.2018.02.045

Cited by 18 publications

(8 citation statements)

References 11 publications

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“…The propagation of cracks and the characteristics of cuttings in the drilling process were investigated by using a high-speed camera in the laboratory [8,9]. discussed the influences of different bottom hole shapes on the effectiveness of rock-breaking [10]. Percussion drilling tests were carried out in a laboratory to evaluate the drilling performance of PDC percussion bits [11].…”

Section: Of 14mentioning

confidence: 99%

Research on Drilling Response Characteristics of Two-Wing PDC Bit

et al. 2020

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Research on drilling response characteristics of two-wing polycrystalline diamond compact (PDC) bit in different rocks is an important way to further understand the mechanism of rock-breaking, improve drilling efficiency, and identify the rock formation interfaces in coal mines. However, the research on the drilling response characteristics of two-wing PDC bits is relatively rare due to the harsh environment in coal mines. In this study, a series of two-wing PDC bits were used to drill in sandstone and sandy mudstone to study the response characteristic of sound pressure level, displacement curves, longitudinal vibration, and rock cuttings size. The collected data were processed by MATLAB based on the 3σ principle. The cuttings were collected through a newly designed cuttings collection device. The experimental results show that the sound pressure level and the longitudinal vibration are larger when drilling in the higher strength sandstone, which is opposite to the cuttings particles and the penetration rate. The reduction of drilling efficiency is more obvious when drilling in sandstone with a worn bit. Therefore, drilling efficiency can be improved by optimizing the bit structure so that the broken rock blocks flow out of the anchor holes as early as possible to avoid being broken into cuttings.

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Section: Of 14mentioning

confidence: 99%

Research on Drilling Response Characteristics of Two-Wing PDC Bit

et al. 2020

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“…The design of the PDC profile was based on the assumption of equal wear and equal volume and energy (Wang et al, 2018). However, the distribution and density of cutters along the bit profile are not the same.…”

Section: Computational Model Of Pdc Bit Lifementioning

confidence: 99%

“…• It is assumed all cutters that located in the inner cone have equal wear, equal volume, and energy (Wang et al, 2018). The same is also applied for the outer cone.…”

Section: Assumptionsmentioning

confidence: 99%

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Mathematical modelling of performance and wear prediction of PDC drill bits: Impact of bit profile, bit hydraulic, and rock strength

Mazen

Mujtaba

Hassanpour

et al. 2020

Journal of Petroleum Science and Engineering

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The estimation of Polycrystalline Diamond Compact (PDC) cutters wear has been an area of concern for the drilling industry for years now. The cutter's wear has been measured practically by pulling the bit out for evaluation at the surface. It is important to find the right time for tripping out as this helps to avoid the fishing job and reduces the operational cost significantly.The prediction of the drilling performance is based on the interaction of cutter and rock. Several authors focused on the cutter-rock interface but only a few researchers tried to model the wear of the PDC bit cutters. The aim of this research is to understand the relationships between the rate of penetration (ROP) and the drilling variables per each foot, and then determine the overall bit efficiency for the whole drilling operation. A new mathematical model is derived to predict the PDC bit performance by considering the factors that were already not taken into account.These factors include rock strength, bit design, and bit hydraulic. The model investigates the effect of these parameters to estimate the abrasive cutters wear on the inner and the outer bit cones by deriving modified equations to calculate the mechanical specific energy (MSE), torque, and depth of cut (DOC) as a function of effective blades (EB). The model is used to forecast the bit cutters wear conditions in four wells in the oil fields located in Libya, which were drilled with three different PDC's sizes. The model enables the results to be compared to the actual bit cutters wear measured for inner and outer cones. The results are found that are well in agreement with the actual field data obtained in bit records.

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“…Simulation results on the influence of confining and hydrostatic pressures showed that the latter had clearly stronger effect of pre-venting damage and thus the rate of penetration. Wang et al [20] applied the finite element method to study the influence of the shape of the bottom of the PDC bit on the rock-breaking effect. The results show that for soft formations, the outer cone arc radius should be larger, and the inner cone angle should be smaller.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Method for Prediction of Rock Breaking Performance of the Tipped Hob With Different Tooth Profiles

Jiang

2020

IEEE Access

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The raise boring machine, which plays a crucial role in wellbore construction, has been widely applied in subway tunnels and mine construction projects. High levels of quality and safety, make it recognized and promoted by an increasing number of users. The tipped hob as a rock-breaking cutter of the raise boring machine poses a direct influence on the efficiency of the well-bore construction. In this paper, the finite element software LS-DYNA is employed to establish the model of the crushed rock with the tipped hob, and the accuracy of the model is examined by experiments. On this basis, the variation laws and correlations of feed force, lateral force and positive force under different penetration depths are studied. The results show that as the penetration depth increases, the feed force, lateral force and positive force all grow exponentially. In the geological environment with high rock hardness, spherical tooth can effectively reduce cutter wear and conical tooth can achieve higher crushing ability. The research results provide a theoretical basis for the selection of a suitable tipped hob to improve rock breaking efficiency. INDEX TERMS Raise boring machine, rock breaking, tooth profile, tipped hob, numerical simulation.

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A novel method for measuring and analyzing the interaction between drill bit and rock

Cited by 18 publications

References 11 publications

Research on Drilling Response Characteristics of Two-Wing PDC Bit

Research on Drilling Response Characteristics of Two-Wing PDC Bit

Mathematical modelling of performance and wear prediction of PDC drill bits: Impact of bit profile, bit hydraulic, and rock strength

Finite Element Method for Prediction of Rock Breaking Performance of the Tipped Hob With Different Tooth Profiles

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