A drilling pressure calculation method, device and drilling pressure indicating equipment

Abstract

The invention provides a method and a device for calculating well drilling pressure and drilling pressure indicating equipment. The method comprises the following steps: acquiring real-time well drilling data; processing the real-time well drilling data by a built analysis mode; acquiring optimized real-time well drilling data; acquiring mechanical characteristic data of a drill column; coupling the optimized real-time well drilling data with the mechanical characteristic data to obtain an under-well axial vibration strength index; building energy efficiency evaluation comprehensive indexes for evaluating the efficiency of axial vibration induced rock breaking in real time by using acquired well drilling engineering parameters; determining the optimal drilling pressure for well drilling based on the under-well axial vibration strength index, the energy efficiency evaluation comprehensive indexes and a mechanical drilling speed. By using each embodiment of the invention, the under-well axial vibration strength index and the energy efficiency evaluation comprehensive indexes can be obtained by calculation and are combined with the mechanical drilling speed so as to suggest the optimal drilling pressure in real time for an operator; the rock breaking efficiency can be improved, and the service life of a drilling tool such as a drill can be prolonged.

Description

technical field [0001] The invention belongs to the technical field of oil and gas exploration and development, and in particular relates to a drilling pressure calculation method, device and drilling pressure indicating equipment. Background technique [0002] The drill string is one of the important drilling tools in drilling construction, and it is the link between the ground drilling equipment and the bottom hole drill bit. Factors such as the collision between the drill string and the borehole wall and formation inhomogeneity lead to large fluctuations in the load on the drill bit, so that the dynamic load is transmitted to the drilling tool itself and the ground power system in the form of vibration, and finally the entire drilling tool assembly vibrates, and then Resulting in BHA (Bottom Hole Assembly) and tool damage. [0003] Drill tool vibration is mainly divided into three types, axial vibration, lateral vibration and torsional vibration. Axial vibration is the ...

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Problems solved by technology

[0004] At present, during the actual operation while drilling, operators usually cannot judge the severity of downhole drilling tool vibration in real time when applying WOB according to the design or technician's instructions, and cannot adjust the WOB at any time according to changes in actual drilling conditions

The seriousness of downhole vibration is often realized only after tripping out or fatigue damage of drilling tools, and at this time it has often brought huge economic losses

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