InforLorV4, Main, Exploration, bibRecord, 00CC48

DESURV: An ANSI C program for borehole desurvey calculation by local least-squares fitting

Identifieur interne : 00CC48 ( Main/Exploration ); précédent : 00CC47; suivant : 00CC49

DESURV: An ANSI C program for borehole desurvey calculation by local least-squares fitting

Auteurs : N. Kuka [Albanie] ; A. Shtuka [France] ; J. J. Royer [France]

Source :

Computers and Geosciences [ 0098-3004 ] ; 1994.

RBID : ISTEX:DA7C2019E20F320C11BB05BEAC77D003C9B69DFF

English descriptors

Teeft :
- Algebraic polynomials, Azimuth, Azimuth readings, Azm_i, Basic functions, Batch mode, Borehole, Borehole curve, Borehole curve modeling, Borehole desurvey calculation, Boreholes, Calloc, Chebfiti_t, Chebyshev, Chebyshev polynomials, Computer program, Computer time, Computers geosciences, Cosine, Desurv, Desurvey, Direction cosines, Downhole, Downhole distance, Drill name, Drill_t, Drill_t p_drill, Drillhole, Endif, F_par, F_pil, False fgets, Fgets, Geological data, Geostatistical, Graphic representations, Grid, High powers, Input parameters, Interpolation, Kuka, L_buffer, Lito, Min_code, Mode_exe, Model parameters, Modeling, Nb_comp, Nb_neib, Node, Nonlinear, Orthogonal, Orthogonal polynomials, P_drill, Pilotage, Polynomial degree, Principal axes, Put_message, Recov, Roundoff errors, Royer, Sample positions, Scatter_t, Shtuka, Sprintf, Survey measurements, Unit vector, Unit vector field, Unit vector fields, Unit vectors, Void, Void void, X_range, Xmax, Xmin, Y_range, Z_range.

Abstract

Abstract: Several methods have been suggested to solve the problem of borehole desurvey calculation, but the least-squares seems to be one of the best approximations to reality. Because the least-squares solution is susceptible to roundoff errors, especially if high powers of the downhole distance are used, two approaches are highly recommended: (1) using orthogonal instead of standard polynomials, and (2) applying the method locally to small regions down the hole. Such procedures provide accurate modeling of the borehole curve, even in the situation of deep and complicated boreholes. An interactive ANSI C computer program is provided to implement the proposed procedure. Considerable control can be exercised by the user in selecting and modifying the model parameters. Graphic displays make it easy to evaluate the data and the model. After adequate fitting of the borehole curve is achieved, the sample coordinates are computed and stored in an ASCII file. Deviations from design position also are computed at the surveyed points and are stored for any further statistical or geostatistical analysis. The local least-squares fitting with Chebyshev polynomials can be extended to gridding of unit vector fields in one, two, or three dimensions.

Url:

https://api.istex.fr/ark:/67375/6H6-M36SQ0GH-2/fulltext.pdf

DOI: 10.1016/0098-3004(94)90036-1

Affiliations:

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Le document en format XML

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<term>Batch mode</term>
<term>Borehole</term>
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<term>Borehole curve modeling</term>
<term>Borehole desurvey calculation</term>
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<front><div type="abstract" xml:lang="en">Abstract: Several methods have been suggested to solve the problem of borehole desurvey calculation, but the least-squares seems to be one of the best approximations to reality. Because the least-squares solution is susceptible to roundoff errors, especially if high powers of the downhole distance are used, two approaches are highly recommended: (1) using orthogonal instead of standard polynomials, and (2) applying the method locally to small regions down the hole. Such procedures provide accurate modeling of the borehole curve, even in the situation of deep and complicated boreholes. An interactive ANSI C computer program is provided to implement the proposed procedure. Considerable control can be exercised by the user in selecting and modifying the model parameters. Graphic displays make it easy to evaluate the data and the model. After adequate fitting of the borehole curve is achieved, the sample coordinates are computed and stored in an ASCII file. Deviations from design position also are computed at the surveyed points and are stored for any further statistical or geostatistical analysis. The local least-squares fitting with Chebyshev polynomials can be extended to gridding of unit vector fields in one, two, or three dimensions.</div>
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DESURV: An ANSI C program for borehole desurvey calculation by local least-squares fitting

DESURV: An ANSI C program for borehole desurvey calculation by local least-squares fitting

Source :

English descriptors

Abstract

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