Abstract
Drilling volumes should be increased in order to increase hydrocarbon production, but this is impossible without the usage of high-quality drilling tools made of modern structural materials. The study has to analyze the design, technological and operational methods to increase the performance of drilling tools made of various materials and has highlighted prospects of technological method applications. The scientific novelty of the study consists in the development of a new analytical model of PDC drill bit–well interaction. The developed model takes into account the drill bit manufacturing errors in the form of bit body–nipple axes misalignment on the drill bit strength. This result makes it possible to determine the permissible manufacturing errors to provide safe operation of the drill bit. It is established that there is an additional transverse force that presses the drill bit to the well wall in the rock due to manufacturing errors. It is determined that the magnitude of this clamping force can be significant. The material effect has been analyzed on additional clamping force. It is established that geometric imperfection of the drill bit causes the minimal effect for the elastic system of the pipe string, which includes a calibrator and is composed of drill pipes based on composite carbon fiber material, and the maximal effect—for steel drill pipes. Polycrystalline diamond compact (PDC) drill bit and well wall contact interaction during operation in non-standard mode is considered. Non-standard stresses are determined, and the strength of the blades is estimated for different values of drilling bit manufacturing error.
Highlights
Nowadays, the global challenge is associated with the need to ensure sustainable development [1,2,3,4]
We studied the global change in the behavior of the elastic system “drill pipes-drill bit-well wall”
We have developed an analytical model of the bit blade–rock contact interaction that takes into account the aforementioned nipple–body axes mismatch influence on the maximum equivalent stresses in the material of the blades
Summary
The global challenge is associated with the need to ensure sustainable development [1,2,3,4]. Despite the rapid development of green energy, oil and gas remain the main energy carriers [5,6]. The problem of providing energy to industries and the population is complicated by the fact that oil and gas deposits are deep and difficult to extract; this stipulates high requirements for materials and good quality drilling tools [10,11]. It should be noted that in addition to having an abrasive environment, rocks are heterogeneous with different physical and mechanical properties [12,13,14,15]. Crack coalescence is a significant phenomenon produced in rocks during the cutting process [16]; it is necessary to provide a simulation of the crack’s propagation and the effect of the in-situ stresses on the mechanical specific energy PDC cutter as shown in [17,18,19]
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