... and assume a level of accuracy that may not reflect current practices for onshore drilling in North America ( Love, 2019 ). This study better quantifies the positional uncertainties of MWD surveys in long laterals and uses those uncertainties to estimate well spacing uncertainty. More than 35,000 MWD bit...

... Abstract The positional uncertainty about a point on a wellbore is commonly represented as an ellipsoid. The ellipsoid also accounts for the dimensions of the casing or open hole. Using this model, at any time the resulting uncertainty about a wellbore along its trajectory is a curved...

... the positional uncertainty of the well being drilledpositional uncertainty of the fractured/fracturing wellsand uncertainty of the fracture length and fracture orientation to avoid this problem. The paper discusses the reasons and challengestechniquesand lessons learned to solve the simultaneous moving boundary...

..., the status of the project and the expected results. wellbore open hole spe 133129 azimuth assembly completion drilling operation transmitter magnetic field directional drilling intersection bha upstream oil & gas moulded ceramic centralizer positional uncertainty reservoir...

... method agrees with analytic results for both parallel and non-parallel wellpaths in simple cases where both wells are straight in the region of interest. well planning parallel well collision probability uncertainty field probability positional uncertainty object well reference interval...

...-in operation to locate and re-enter the 12 1/4" open hole below the bit of the stuck assembly, 3680m below surface. Key issues addressed during the planning phase included relief well strategy, positional uncertainty, well control scenarios, options for isolation and contingencies. An active electro-magnetic...

...-field geomagnetic models. This significantly reduces the magnitude of certain critical directional uncertainty error terms which are inputs to survey tool accuracy performance models, reducing positional uncertainty for well-planning purposes. Logistical problems and high unit-cost have precluded IFR...

... uncertainty comparisons is highlighted. drilling close rule information exclusion zone drilling operation inclination artificial intelligence variance standard deviation positional uncertainty collision std dev uncertainty data proximity ratio collision avoidance work contractor...