An anti-collision early warning method for the upper vertical section of cluster wells based on the detection of the magnetic field of adjacent well casing strings

Abstract

The invention discloses an anti-collision early warning method for the upper vertical well section of a cluster well based on the detection of the magnetic field of the adjacent well casing string itself, which mainly includes two links - the identification of the magnetic interference of the adjacent well casing and the inversion of the relative position of the adjacent well casing . In the identification of wellbore collision risk, a practical method is given to identify the magnetic interference phenomenon of adjacent well casing and the risk of wellbore collision as early as possible by using the rapid tool surface measurement value of MWD; In the demonstration link, the comprehensive utilization of MWD's fast tool face (magnetic tool face MTF) and full measurement data (including magnetic field strength and magnetic inclination angle) is given to judge the magnitude and direction of magnetic interference, and then estimate the relative distance and relative orientation of adjacent well casings. practical method. Compared with the current anti-collision early warning method for the upper vertical section of a cluster well, the present invention can not only improve the identification probability of borehole collision risk, but also detect the wellbore collision risk as early as possible, and estimate the relative position of the casing string of adjacent wells, Provide important support for anti-collision and obstacle avoidance 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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