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Directional survey errors

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Journal Articles
SPE Drill & Compl 2 (03): 257–267.
Paper Number: SPE-15462-PA
Published: 01 September 1987
...Olivier Dubrule; Phillip H. Nelson Summary. More than 1,000 directional surveys from wells in the Prudhoe Bayfield are used to examine differences in well location at 8,000 ft [2438 m]subsea, as measured by gyroscopic and magnetic surveying instruments. Thelateral, radial, and vertical errors...
Journal Articles
J Pet Technol 23 (11): 1368–1374.
Paper Number: SPE-3718-PA
Published: 01 November 1971
...R.P. Harvey; J.E. Walstrom; H.D. Eddy This is a summary and an extension of the ideas presented in two earlier papers dealing with the effects that data errors and model errors have upon the results from directional survey calculations. An important conclusion is that if any of five specific models...
Proceedings Papers

Paper presented at the SPE Norway One Day Seminar, April 18, 2018
Paper Number: SPE-191341-MS
... understanding of the behavior and contribution of each survey error source and screens the error terms contributing most towards WPU. Visualizing the contribution of each error source as a function of well path direction and inclination will support the understanding of position uncertainty of individual wells...
Proceedings Papers

Paper presented at the IADC/SPE Drilling Conference and Exhibition, March 1–3, 2016
Paper Number: SPE-178843-MS
... result in excessive targeting constraints or directional control requirements. An analysis of industry survey of error codes being utilized across companies was performed, both vast inconsistencies and significant gaps were realized. A case for action was determined and a collaborative work group...
Proceedings Papers

Paper presented at the SPWLA 46th Annual Logging Symposium, June 26–29, 2005
Paper Number: SPWLA-2005-G
... Committee on Wellbore Survey Accuracy (ISCWSA has developed error models for magnetic directional surveys, which now have become an industry standard. These error models are derived for two standard single-station processing techniques. The error term values are settled with the basis in input from several...
Journal Articles
J Pet Technol 24 (08): 935–943.
Paper Number: SPE-3379-PA
Published: 01 August 1972
...J.E. Walstrom; R.P. Harvey; H.D. Eddy The classic terminal angle method of directional survey calculation is grossly susceptible to error, and the recommendation is that it be abandoned. There are too many alternatives that are better. One of them is the balanced tangential method, which has proved...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 9–11, 2017
Paper Number: SPE-187050-MS
... Abstract Magnetic ranging has been used in heavy oil drilling environments, primarily in steam-assisted gravity drainage (SAGD) applications, to eliminate accumulated directional survey errors. SAGD applications require drilling several pairs of horizontal, parallel wells separated by a few...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 9–11, 2017
Paper Number: SPE-187249-MS
... scope for modern directional well survey programmes. These are examined separately as a model error and a measurement error. Both of these error sources are influenced by survey station interval length. The results from these additions are compared to the standard MWD error model from the OWSG...
Journal Articles
SPE Drill & Compl 5 (04): 294–298.
Paper Number: SPE-18051-PA
Published: 01 December 1990
...John L. Thorogood Summary. When planning, monitoring, or checking the results from a directional surveying program, one must be able to predict the probable errors associated with the different survey tools used. An "instrument performance model" is a mathematical algorithm that, when combined...
Proceedings Papers

Paper presented at the IADC/SPE Drilling Conference and Exhibition, March 6–8, 2018
Paper Number: SPE-189654-MS
... of the simulator is highly sensitive to the probability distribution of the input-survey errors. The input-probability distribution of well separations in the high side and lateral directions is determined from survey-comparison studies for both systematic and random-error sources. The simulator is used to compare...
Journal Articles
SPE Drill & Compl 5 (03): 209–214.
Paper Number: SPE-19030-PA
Published: 01 September 1990
.... The interference is manifest as a stray field acting along the survey- tool axis. This problem has been recognized and addressed by many authors, including Grindrod and Wolff. 15 Drillstring-induced sur- vey errors increase with inclination and as borehole direction ap- proaches east/west. It is particularly...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 26–29, 2020
Paper Number: SPE-201740-MS
... in high-value international offshore drilling operations as at the time, those locations were performing the bulk of the complex directional drilling operations that placed a premium on survey accuracy. During this error model development, as more or better data were acquired, or additional analysis had...
Proceedings Papers

Paper presented at the SPE Offshore Europe, September 3–6, 1991
Paper Number: SPE-23041-MS
... drilling hazard. Key considerations in the planning and execution of Piper B directional drilling include: the QC of survey records for the original Piper A wells; the quantification of survey errors in the original Piper A surveys; the assignment of error models for the calculation of positional...
Proceedings Papers

Paper presented at the IADC/SPE Drilling Conference and Exhibition, March 6–8, 2018
Paper Number: SPE-189612-MS
.../ellipse-of-uncertainty.html ( accessed 12 October, 2017 ). PetroWiki . 2017 . Directional Survey Errors . ( 4 July 2017 revision). https://www.netwasgroup.us/oil-well/circle-of-uncertainty.html ( accessed 18 October, 2017 ). Taleb , N. 2015 . Making A Risk Matrix Useful . Casual...
Proceedings Papers

Paper presented at the SPE/IADC International Drilling Conference and Exhibition, March 8–12, 2021
Paper Number: SPE-204026-MS
... Abstract It has been well documented that magnetic models and Measurement-while-Drilling (MWD) directional sensors are not free from error. It is for this reason that directional surveys are accompanied by an error model that is used to generate an ellipse of uncertainty (EOU). The directional...
Journal Articles
SPE Drill & Compl 15 (04): 221–233.
Paper Number: SPE-67616-PA
Published: 01 December 2000
... uncertainty. This paper provides a three-part response to this need. 1. Error Model for Basic MWD. This is based on the current state of knowledge of a group of industry experts. There are several reasons why directional MWD is the most suitable survey service to illustrate a new method of error modeling...
Journal Articles
SPE Drill & Compl 7 (02): 100–106.
Paper Number: SPE-20931-PA
Published: 01 June 1992
..., A. Gelb (ed The M.I.T. Press, Cam- bridge, MA (1974). II. Wolff, C.J.M. and de Wardt, J.P.: "Borehole Position Uncertainty Analysis of Measuring Methods and Derivations of Systematic Error Model," JPT (Dec. 1981) 2339-50. 12. Dubrule, O. and Nelson, P.H.: "Evaluation of Directional Survey Errors...
Proceedings Papers

Paper presented at the Abu Dhabi International Petroleum Exhibition & Conference, November 9–12, 2020
Paper Number: SPE-203361-MS
... while rotating, the standard stationary MWD error model does not apply in all respects. An analysis of drilling efficiency savings is conducted, looking at the rig time savings from eliminating static MWD surveys, directional improvements compared to similar previous well, and the reduction in open...
Proceedings Papers

Paper presented at the SPE/IADC Drilling Conference, February 20–22, 2007
Paper Number: SPE-105558-MS
..., incorporate the need for an overlapping verification survey or other independent observation. This requirement is not generally acknowledged in most of today's directional surveying QC procedures, which may be too weak to ensure the validity of a given error model and thus the integrity of the final well...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, September 30–October 2, 2013
Paper Number: SPE-166226-MS
... by the University of Tromsø. Quality control of MWD magnetic directional surveys is based on geomagnetic data from the stations. Magnetic interference from steel components in the drillstring is a significant error source in MWD magnetic directional surveying. It is common industry practice to model...

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