Performance, simulation and field application modeling of rollercone bits

Rashidi, B.; Hareland, Geir; Wu, Zhihui

doi:10.1016/j.petrol.2015.06.003

Cited by 20 publications

(14 citation statements)

References 12 publications

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“…where F is the load on a single tooth of the bit; C 1 is the coefficient of friction on the surface at the tooth tip (-); w is the tooth width (m); C 2 is the coefficient of friction on the tooth surface in contact with the rock (-); h is the penetration depth of the tooth (m); l is the tooth length (m) and σ p is the compressive strength of the rock (Pa). The result of the reaction force F on the tooth of the bit in contact with the rock is equal to the load generated on the bit [22] and is given by:…”

Section: Drilling Principle Of the Roller Cone Drill Bitmentioning

confidence: 99%

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Characterisation of the Wear of the Roller Cone Drill Bit Caused by Improperly Chosen Drilling Regime

Šporin

2020

Materials and Geoenvironment

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The rapid drop in the penetration rate or failure of the drill bit during the drilling process delays the drilling process. In our investigation, the ‘in situ’ drilling parameters were monitored during the drilling process along with the roller cone drill bit, which is suitable for drilling in soft rock formations (IADC 136). The drill bit was thoroughly examined to determine its damage and wear occurred during drilling along with decreasing penetration rate. The modern and standardised investigation methods were used to analyse the rock materials and the micro- and macro-structure of the materials of the roller cone bit. The analyses were performed by means of optical and electron microscopes, simultaneous thermal analysis of the steel materials, analysis of the chemical composition of the materials of the drill bit and determination of the geomechanical parameters of the drilled rock. The resulting wear, localised fractures and cracks were quantitatively and qualitatively defined and the parameters were correlated to the drilling regime and the rock material. The results of our investigation of the material of the roller cone bit can serve as a good basis for the development of new steel alloys that can withstand higher temperatures and allow effective drilling without structural changes of the steel material.

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Section: Drilling Principle Of the Roller Cone Drill Bitmentioning

confidence: 99%

“…where WOB is the weight on the bit (N) and n t is the number of teeth in contact with the rock. The volume of the crater of the crushed rock V crat (m 3 ) created by one tooth, assuming that the crater has a conical shape, is stated by the following equation [22]:…”

Section: Drilling Principle Of the Roller Cone Drill Bitmentioning

confidence: 99%

Characterisation of the Wear of the Roller Cone Drill Bit Caused by Improperly Chosen Drilling Regime

Šporin

2020

Materials and Geoenvironment

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“…Roller-cone bit is the most important tool of rock breaking in drilling engineering, the working performance of which directly affects the drilling quality, efficiency, and cost. 1,2 The service life of the bearing system is one of the key factors that affect the service life of a roller-cone bit, while the service life of the bearing system is largely dependent on the service life of the sealing rings. Figure 1 is the assembly diagram of the bearing seal of a high-speed roller-cone bit.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of sealing performance of bearing rings of roller-cone bits based on grid-shaped bionic non-smooth surface

Zeng

Zhou

2018

Advances in Mechanical Engineering

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Based on the bionic non-smooth surface theory, this article carries out (1) design of the structure of bionic non-smooth sealing rings and toothed bars of the sealing structure and (2) finite element simulation study on the bionic non-smooth surface structure of roller-cone bits. The result shows that (1) when the parameter Y is equal to the rack angles, the maximum pressure of the Type B is smaller than that of the Type A, while the equivalent stress of the Type A is smaller than that of the Type B; when the parameter Y is equal to the tooth distribution, the maximum pressure and the equivalent stress of the rack angle of 30°are smaller than that of the rack angle of 20°; and when the rack angle is equal to the tooth distribution, the maximum contact pressure and the equivalent stress of the tooth decrease with the increase in the parameter Y.(2) Compared with the O-shaped sealing rings, the new tooth bars avoid the problem of over-large contact area. (3) The grid-shaped sealing structure can increase the wear resistance of rubber rings and delay their wear and aging, thus improving their service life.

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“…(2010) introduced a ROP model considering the bit cutting structure and drilling parameters based on the interaction mechanism between the drill bit and rock. Rashidi et al (2015) investigated the effect of the drilling parameters, cutting structure of bits and bit wear on the drilling rate and developed a ROP model for roller cone bits. However, because of the complexities and questionable assumptions of the existing models, errors exist, to some extent, between the model predictions and field observed data or experimental data.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental study on the penetration rate for roller cone bits based on the rock dynamic strength and drilling parameters

Deng

Chen

Jin

et al. 2016

Journal of Natural Gas Science and Engineering

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Roller cone bits have been used extensively in petroleum and natural gas mining, and the accurate prediction of their rate of penetration (ROP) is of crucial importance for improving drilling quality and reducing drilling cost. In this study, a new prediction model of the ROP considering the combined effect of the main drilling parameters and rock dynamic compressive strength is developed for roller cone bits. The model is derived based on the mechanism of rock fragmentation under a single tooth impact indentation. The newly introduced ROP model is different from others in that it replaces the rock static strength with rock dynamic compressive strength and can reflect the real process of rock dynamic crushing by a roller cone bit. The results of theoretical analysis show that the ROP linearly correlates with the bit rotary speed; the relationship between the ROP and weight on bit (WOB) is 3/2 power, and the relationship between the ROP and rock dynamic compressive strength is -3/2 power. Furthermore, lab drilling tests on sandstone and limestone are carried out with a full-scale bit drilling testing machine, and © 2016. This manuscript version is made available under the Elsevier user license http://www.elsevier.com/open-access/userlicense/1.0/ the influence laws of WOB, rotary speed and rock dynamic strength on the ROP are analyzed. In addition, the theoretical ROP values calculated based on the rock dynamic compressive strength and static compressive strength are compared with the experimental ROP values. The results from the tests indicate that the experimental ROP values are basically consistent with the theoretically derived values, and the comparative results show that the theoretical ROP values calculated according to the rock dynamic compressive strength are closer to the actual values with, anaverage relative error below 15%, signifying that the newly established ROP model in this paper is valid and can be used to predict the drilling rate with reasonable accuracy and can be used to provide useful guidance for optimizing drilling parameters.

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Performance, simulation and field application modeling of rollercone bits

Cited by 20 publications

References 12 publications

Characterisation of the Wear of the Roller Cone Drill Bit Caused by Improperly Chosen Drilling Regime

Characterisation of the Wear of the Roller Cone Drill Bit Caused by Improperly Chosen Drilling Regime

Evaluation of sealing performance of bearing rings of roller-cone bits based on grid-shaped bionic non-smooth surface

Theoretical and experimental study on the penetration rate for roller cone bits based on the rock dynamic strength and drilling parameters

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