METHOD FOR DETERMINING HORIZONTAL-HEIGHT POSITION COORDINATES OF UNDERGROUND PIPELINE AXIS Russian patent published in 2021 - IPC F17D5/00 

FIELD: instrumentation.

SUBSTANCE: invention can be used to determine the coordinates of the plane/altitude position of the axis of an underground pipeline, which has great depths, in the areas of its transitions through deep water barriers, as well as to control the spatial position of the axis of the pipeline when it is laid by the method of inclined directional drilling. The method includes excitation by an alternating current generator, positioning the operator above the inspected pipeline and taking measurements above and near the pipeline of the induction of an alternating magnetic field generated by the current in the pipeline, measuring the distance from the sensors to the projection of the pipeline axis on the day surface, determining the angles of rotation of the field sensors around horizontal and vertical pipeline axes, obtaining a matrix of corrections related to the angles of rotation of sensors and their distance relative to the pipeline axis, making corrections to the matrix of field components and their differences, processing measurement results and determining the technical parameters of an underground pipeline. The essence of the invention is to determine the planned-altitude position of the pipeline axis in the global coordinate system with the accuracy used by the differential navigation satellite system, excluding the negative influence of the technical capabilities of the diagnostic device on the formation of data on the altitude position of the pipeline axis. Above the pipeline at the points of measurement of the altitude position of the pipeline axis, the poles move the matrix of magnetic field sensors across the axis of the pipeline in both directions from the poles at a distance of at least one and a half depth of its location, the induction vector of the alternating magnetic field created by the generator current in space is measured, an array of points having GPS coordinates with differential corrections is obtained, then in the global system there's to determine: coordinates of the location of the pipeline axis in the horizontal plane at the point of maximum value of the magnetic field induction; as well as the depth of the pipeline in relation to the day surface according to the graph of the distribution of the magnetic field induction vector, which is calculated as half the length of the chord drawn between the points located on the curve of the graph at a value equal to half of the maximum value of the magnetic field induction, then the elevation of the pipeline axis is to be determined, subtracting the depth of its laying from the elevation of the soil above the axis of the pipeline; when processing data on the spatial position of the pipeline, the elevation marks of its axis are adjusted taking into account the data obtained during the transverse inspection of the pipeline.

EFFECT: efficient measurement of hard-to-reach pipelines.

1 cl, 2 dwg