A new approach is proposed for optimally locating extension wells when prospecting for oil deposits. The approach is based on combining different methods for measuring the coordinates of the extension points, subsequently constructing a smoothing splb~e, and arranging wells along this spline ushTg the condition for a minimum of the trace of the dispersion matrix of estimates obtained by the least squares method (A-optimal plan).One of the most important problems when prospecting for oil deposits is that of outlining the deposits. One of these is based on the fact that the greatest prospecting errors usually occur in determining the boundaries of the deposit. The length of the water-oil outline is reduced and there is a change in the perceived area of the deposits and consequently of the industrial oil reserves. It is therefore necessary to perform an advance outlining of the deposits but with a limited number of wells (many wells subsequently proving to be beyond the outline).The solution of this problem is relevant not only because of the increase in the accuracy of the calculations (numerical and ~aphical) but also because of the efficiency of performing them [1].We propose a new approach to the optimal location of extension wells when prospecting for oil deposits which is based on selecting, out of all the possible approaches to distributing a given limited number of wells, the one for which the errors in estimating the unknown coefficients of the approximating polynomial reach a minimum.Combined Application of Methods for Outlining Deposits. The most efficient methods of outlining deposits are those of remote outlining, based on hydrodynamic investigations of wells and also on combining such operations as the boring of prospecting wells, electrical prospecting of wells, seismic prospecting, boring of operational wells during the prospecting activity.By combining the methods of a hydrodynamic investigation of wells (the error in determining an outline of average complexity being 15-25 %), electrical prospecting (5-15%), and pulsed seismic holography (1-5 %), it is possible to obtain the initial position of the water-oil outline.One efficient method for the combined processing of the information in this case is that of averaging the results of measurements of the coordinates x and y of points determining the initial position of the water-oil outline, taking account of the errors of the different outlining methods.However, in the case of hidden failure of one of the measuring instruments employed, when the coordinate value measured by it is far from the true one, the accuracy of the coordinate estimates ,~, 9 is considerably reduced, the more so the fewer the number of outlining methods. In view of this, it is advisable to utilize acceptance monitoring prior to performing the averaging.Hidden failures are usually detected by comparing the coordinates values measured by different methods. Two methods are not sufficient for detecting the failed instrument since, if the coordinate values measured using them differ ...
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