Method and system for calculating mechanical specific energy applied to air hammer drilling

Abstract

The invention discloses a mechanical specific energy calculation method applied to air hammer drilling. The method comprises the following steps: establishing a mechanical specific energy model of airhammer drilling based on R. Teale mechanical specific energy model and rock breaking mechanism of air hammer drilling; analyzing the working process of the air hammer, and according to the specific energy model of the air hammer drilling machine, obtaining the calculation formula of the specific energy of the air hammer machine including the energy transfer efficiency parameter; the energy transfer efficiency parameter being calculated, and the obtained energy transfer efficiency parameter being substituted into the mechanical specific energy calculation formula of the air hammer. A calculation model of specific energy of air hammer drilling machine is established according to the working principle of air hammer drilling, which is used for analyzing the drilling efficiency of air hammer drilling and the working condition of drill bit, and can evaluate the working efficiency of air hammer drilling in real time, thereby adjusting drilling parameters, optimizing the structure of air hammer drilling and achieving the purpose of optimizing drilling.

Description

technical field [0001] The present invention relates to the technical field of oil and gas well drilling, in particular to a calculation method of mechanical specific energy applied to air hammer drilling, which facilitates the real-time evaluation of air hammer drilling work in complex well sections by technical personnel on the drilling engineering site, and then timely Adjust working parameters to achieve drilling optimization. Background technique [0002] Air hammer drilling refers to the drilling method in which the air hammer connected to the drill bit applies pressure to the drilling tool and rotates at the same time, giving the drill bit high-frequency impact energy to perform impact rotation. Air hammer drilling has the characteristics of low drilling pressure, low speed and stable torque, which can significantly increase drilling speed and effectively control well deviation, and take into account the advantages of less damage to reservoirs by gas drilling. Theref...

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Problems solved by technology

[0004] In the existing technology, the mechanical specific energy technology is limited to the efficiency evaluation of conventional drilling. At present, there is no method for evaluating and analyzing the drilling efficiency of the air hammer and the working condition of the drill bit. It is impossible to effectively adjust the drilling parameters in real time and optimize the structure of the air hammer. Optimal Drilling Purpose

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