Cluster wheel upper straight well section anti-collision early-warning method based on detection of magnetic field of adjoining well sleeve column

Abstract

The invention discloses a cluster wheel upper straight well section anti-collision early-warning method based on the detection of a magnetic field of an adjoining well sleeve column. The method mainlyincludes the two steps of adjoining well sleeve magnetic interference recognizing and adjoining well sleeve relative position inverting. In the well hole collision risk recognizing link, a practicalmethod for recognizing the adjoining well sleeve magnetic interference phenomenon and the well hole collision risk as early as possible through a rapid tool face measuring value of MWD is put forward;in the adjoining well sleeve relative position inverting link, a practical method for judging the magnitude and direction of magnetic interference comprehensively through the rapid tool face (magnetic tool face MTF) of the MWD and all measurement data (magnetic field intensity and magnetic inclination angle) so as to estimate the relative distance and relative direction of an adjoining well sleeve is put forward. Compared with an existing cluster well upper straight well section anti-collision early-warning method, the method has the advantages that the well hole collision risk recognizing probability can be improved, the well hole collision risk can be found as early as possible, the relative position of the adjoining well sleeve column is estimated, and the important support is providedfor anti-collision obstacle bypassing construction.

Description

technical field [0001] The invention relates to the field of cluster well drilling engineering, in particular to an anti-collision early warning method for the upper vertical section of a cluster well based on the detection of the magnetic field of an adjacent well casing string. Background technique [0002] At present, more and more infill wells and adjustment wells are newly drilled, the scale of new cluster well groups is getting larger and larger, the space distance between wells is getting smaller and smaller, and the wellbore intersections that encounter (or even drill through) the casing of adjacent wells Accidents happen from time to time, which not only bring important economic losses, but also bring major safety hazards. Wellbore anti-collision is one of the key issues for safe and efficient drilling of infill wells, adjustment wells and cluster wells. At present, the passive magnetic ranging detection method is mainly used to solve the problem of borehole anti-c...

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Problems solved by technology

It is also not feasible to use the full measurement mode to encrypt the measurement to obtain enough magnetic field parameters - because the full measurement mode needs to stop the pump (drilling pump) and start the pump frequently, stop the active drilling tool and wait for the data to be uploaded, which not only takes up too much drilling operation time , also increases the risk of stuck pipe

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