Abstract
Roller cone bit is one of the main rock-breaking tools in oil and gas well engineering, and its performance could directly affect well drilling speed and cost. The particular structure of roller cone bit and the random breakage in heterogeneity rock make it difficult to study the problem of rock-breaking mechanism of roller cone bit under bottom-hole condition. Although, research on this topic has been carried out and drilling speed models under down hole conditions have been proposed. The research was based on rock intrusion theory and included the condition of bottom-hole pressure. Theoretical analysis shows that during the transient process of strata changing from soft form and medium-hard form to hard form, the drilling rate model is able to explain the influence of various ways of rock breakage on the drilling rate or the rate of penetration (ROP) of roller cone bit. The test results also show that the invasion depth of conical insert and chisel teeth both decreases exponentially with the increase in bit angle and fluid column pressure, where conical insert has greater decreasing rate than chisel teeth. In addition, the present study demonstrates that the intrusive coefficient is essential to quantify the intrusive-resistance capacity of bottom-hole rock.
Copyright 2018, Shaanxi Petroleum Society.
This paper was prepared for presentation at the 2018 International Field Exploration and Development Conference in Xi’an, China, September 18–20, 2018.
This paper was selected for presentation by the IFEDC Committee following review of information contained in an abstract submitted by the author(s). Contents of the paper, as presented, have not been reviewed by the IFEDC Committee and are subject to correction by the author(s). The material does not necessarily reflect any position of the IFEDC Committee, its members. Papers presented at the Conference are subject to publication review by Professional Committee of Petroleum Engineering of Shaanxi Petroleum Society. Electronic reproduction, distribution, or storage of any part of this paper for commercial purposes without the written consent of Shaanxi Petroleum Society are prohibited. Permission to reproduce in print is restricted to an abstract of not more than 300 words; illustrations may not be copied. The abstract must contain conspicuous acknowledgment of IFEDC. Contact email: paper@ifedc.org.
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- \(P_{P}\) :
-
Pore pressure
- \(P_{m}\) :
-
Fluid pressure
- \(\Delta P_{w}\) :
-
Additional pressure generated by drilling fluid circulation
- \(\sigma_{n}^{e}\) :
-
Effective normal principal stress
- \(\sigma_{Hh}^{e}\) :
-
Effective horizontal stress
- \(\sigma\) :
-
Normal stress
- \(\tau\) :
-
Shear stress generated by axial load
- P :
-
Axial load
- \(\theta\) :
-
Bit angle
- \(\varphi\) :
-
Angle between sheer failure surface and the horizontal bottom
- C :
-
Cohesive force
- \(\phi\) :
-
Angle of internal friction
- K :
-
Intrusive coefficient of bottom-hole rock
- x :
-
Half length of crater, \(x = h\,\tan \varphi\)
- \(L_{\text{h}}\) :
-
Width of chisel teeth
- m:
-
Number of teeth on each cone in contact with rock in bottom at some point
- \(d_{\text{b}}\) :
-
Diameter of bit
- \(n_{\text{b}}\) :
-
Rotation speed of bit
- \(C_{\text{H}}\) :
-
Hydraulic purification coefficient
- \(C_{\text{P}}\) :
-
Differential pressure influence coefficient
- \(d_{\text{c}}\) :
-
Diameter of cone
- \(n_{\text{c}}\) :
-
Rotation speed of cone around the cone axis
- Z:
-
Number of teeth in outward ring on cone, similarly
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Wei, L., Bing, L., Wenfeng, S., Siqi, L., Huan, Z. (2020). A Drilling Rate Model for Roller Cone Bit with Experimental Verification. In: Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2018. IFEDC 2018. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-13-7127-1_17
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DOI: https://doi.org/10.1007/978-981-13-7127-1_17
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