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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; Philip H. Nelson Summary More than 1,000 directional surveys from wells in the Prudhoe Bay field are used to examine differences in well location at 8,000 ft [2438 m] subsea, as measured by gyroscopic and magnetic surveying instruments. The lateral, 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
... Drilling (MWD) is a common survey tool used in wellbore positioning. The industry often uses the Industry Steering Committee on Wellbore Survey Accuracy (ISCWSA) error models for estimating the Wellbore Position Uncertainty (WPU). However, the model's sensitivity to direction and nature of trajectory has...
Proceedings Papers

Paper presented at the IADC/SPE Drilling Conference and Exhibition, March 1–3, 2016
Paper Number: SPE-178843-MS
... result in a missed well intersection during relief well first ranging point operation. Conversely, overly conservative estimations can result in excessive targeting constraints or directional control requirements. An analysis of industry survey of error codes being utilized across companies...
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 SPE Annual Technical Conference and Exhibition, October 26–29, 2020
Paper Number: SPE-201740-MS
... presented to the working group by volunteers. These volunteers were most often involved 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...
Proceedings Papers

Paper presented at the IADC/SPE Drilling Conference and Exhibition, March 6–8, 2018
Paper Number: SPE-189654-MS
... 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...
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 SPE Annual Technical Conference and Exhibition, October 3–6, 1999
Paper Number: SPE-56702-MS
... provides a three-part response to this need: Error Model for Basic MWD , 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 modelling: the error budget...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, September 30–October 2, 2013
Paper Number: SPE-166226-MS
... & gas declination error model barent sea interference dip angle deviation magnetometer station bjørnøya azimuth uncertainty dsi magnetic field latitude mwd error model variation disturbance directional survey sørøya Introduction Following Ekseth (1998) , the azimuth A used...
Proceedings Papers

Paper presented at the Abu Dhabi International Petroleum Exhibition & Conference, November 9–12, 2020
Paper Number: SPE-203361-MS
..., and this paper outlines how this has been done, and the magnitudes for the final derived errors in terms of bottom hole positioning errors compared to stationary MWD surveys. The savings in rig time, directional control, and the reduction in stuck pipe risk are significant and critically reduce time spend off...
Proceedings Papers

Paper presented at the SPE Nigeria Annual International Conference and Exhibition, August 6–8, 2018
Paper Number: SPE-193496-MS
... discussed. well planning Artificial Intelligence Directional Drilling Upstream Oil & Gas wellpath course length directional sensor sensor misalignment TVD uncertainty sag dual inclination plot inclination difference well 2 drilling operation survey data error model BHA dual...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 3–5, 2022
Paper Number: SPE-210184-MS
... equates to a TVD error of 10.47m over a 6000m horizontal section. Therefore for some wells it was essential to see what the true SAG correction would be for DDS surveys. BHA sag is the misalignment of the directional sensor with the borehole direction due to deflection of the measurement tools under...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3583604
... We present the results of applying a novel inversion approach to simultaneously estimate acquisition-related errors associated with a sparse ocean bottom nodes survey in the Gulf of Mexico. The travel times of the direct arrivals are picked and input to an inversion-based method to compute...
Proceedings Papers

Paper presented at the SPE/IADC Drilling Conference, February 20–22, 2007
Paper Number: SPE-105558-MS
..., but it is then necessary to keep in mind that the uncertainties along these three directions usually are more correlated than along the lateral, highside and along-hole directions. The CODT has, in part, been created to QC surveys against gross depth errors. Relative depth corrections, as requested in the IDT may mask...
Proceedings Papers

Paper presented at the SPE/IADC Middle East Drilling Technology Conference and Exhibition, January 29–31, 2018
Paper Number: SPE-189432-MS
... static survey well trajectory inclination survey package azimuth measurement while drilling RSS error model well direction wellbore positioning accuracy MWD survey Introduction MWD surveys have been the backbone of wellbore surveying for many years. MWD surveys are subject to a number...

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