Introduction of internal knowledge of drilling machine
Release time:
2020-07-15
Drilling machine internal knowledge is very rich, worth a glance.
Many people's understanding of drilling machines is still very one-sided. In fact, the internal knowledge of drilling machines is very rich. Today, we will simply smooth it out.
(1) The concepts of drilling machine bit oblique cut index and anisotropy index and comprehensive cutting preparation anisotropy index are derived from the general Roundup and simplified form of formation white inclination force suitable for the actual drill bit, volume crushing and surface crushing conditions of drilling machine. Using the drilling machine bit pressure cone method to derive the formula of formation change and deviation force and formation change azimuth force in directional drilling, it provides the basis for the analysis of formation force and personnel for the directional and orbital control of the drilling machine. It is verified that the theoretical analysis results are in good agreement with the actual drilling.
(2) On the basis of the proposed new concept, the critical formation dip angle equation is found, which provides a preliminary quantitative explanation for the drill bit trend of the drilling machine.
(3) The small formation inclination force and formation entry force, scoop angle, weight on bit, formation inclination angle, drilling machine bit anisotropy index, formation anisotropy index, well bore orientation are related to the fire angle of formation inclination orientation. The formation coclinotectic force may be a build-up force or a down-slope force, and the formation azimuthal change force may be an increasing azimuthal force or a decreasing azimuthal force. In general, the formation deviation force makes the drill bit trajectory close to the formation normal direction, and the formation change azimuth force makes the borehole azimuth close to the formation inclination azimuth. When the borehole azimuth of the drilling machine is consistent with the formation inclination azimuth, the formation variable azimuth force is zero.
(4) The formation force of the drilling machine is proportional to the WOB, and the formation force will increase significantly when the WOB is increased.
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