Determination of the spatial position of the borehole based on measurement data

Abstract

The spatial position of a curved borehole is determined from measurement data. Measurements give in a number of points Mi (i=1, 2,..., n), taken along the length of the borehole, values of inclination angles θi and azimuth ϕi. According to these data and distances St of points Mi from the wellhead, the position of points Mi and the well as a whole is determined. This determination can be made in various ways, each of which gives an approximate position of the borehole. The question arises about the evaluation of possible deviation of the obtained position of the well from the actual one and the dependence of the accuracy of determining the spatial position of the well on the accuracy of angle measurements and the number of points in which such measurements are made.