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Name Goal Description
17375445 Relief well convey depth uncertainty when approaching a blowout well During the approach by a relief well to a blow-out well, the wellbore position uncertainty of the relief well and the well to kill are very important. Edit | Details | Delete
85586399 Formation Evaluation Log while Drilling Describe how a formation evaluation log is acquired while drilling It is a part of the rubber banding log depth use case. See example from Dashevskiy et al., 2008, Dynamic Depth Correction to Reduce Depth Uncertainty and to Improve MWD/LWD Log Quality, SPE Drilling and Completions, page 13-22 Edit | Details | Delete
148903219 Simplified Formation Evaluation Log while Drilling Describe in a simple manner how a formation evaluation log is acquired while drilling It is a part of the rubber banding log depth use case. See example from Dashevskiy et al., 2008, Dynamic Depth Correction to Reduce Depth Uncertainty and to Improve MWD/LWD Log Quality, SPE Drilling and Completions, page 13-22 Edit | Details | Delete
287258547 Test session Testing Edit | Details | Delete
356087262 Formation Evaluation Log while Drilling Describe how a formation evaluation log is acquired while drilling It is a part of the rubber banding log depth use case. See example from Dashevskiy et al., 2008, Dynamic Depth Correction to Reduce Depth Uncertainty and to Improve MWD/LWD Log Quality, SPE Drilling and Completions, page 13-22 Edit | Details | Delete
547628522 Measurement of bit depth Convey TVD uncertainty with reference to measured depth Bit depth is calculated by the integration of the vertical motion of the bit and drillstring. The vertical motion of the bit is a function of top drive vertical motion, block height vertical motion, change in surface hookload, and change in downhole WOB. The measured vertical motion of the top drive is affected by rig heave; the measured vertical motion of the block is affected by calibration and measurement accuracy and the top drive may be slightly bent, leading to uncertainty in block height. The integration is reset (“truthed”) on “pipe-down” using the pipe tally, which leads to jumps in measured bit depth. The integration is started with recognition of “bit on-bottom” which is remotely evaluated on surface, and is uncertain. Edit | Details | Delete
594216391 Impact of earth curvature Convey TVD depth uncertainty When surveying with an inclinometer, the inclination angle is relative to the vertical defined by the gravitational field. But when surveying with a gyro, the inclination is relative to the initial vertical before running the gyro. (A. Brooks, SPE-116155-PA) Edit | Details | Delete
837791268 Change drill-floor elevation throughout life of a well Correct for possible effect of time on certain depth datum. Some depth datum may change with time for instance because the rig has changed, because of subsidence, etc. Edit | Details | Delete
846801896 Geo-modeler inform Drilling about TVT uncertainty from ground level #2 Convey TVD depth uncertainty. The earth model has uncertainty on the true stratigraphic thickness of each formation layers. The TVT needs to be conveyed to the drilling team based on the planned well path. Edit | Details | Delete
881152003 Intersecting a wellbore Convey TVD uncertainty during wellbore intersection. Driller or Operator unintentionally sidetracks a well significantly above TD, and wishes to re-enter the mother bore with the sidetracked well with minimum dog-leg severity. This operation will save having to drill an entire sidetrack to TD. There are several issues here all related to uncertainty (a) detecting that an unintentional sidetrack has occurred, (b) steering back to the mother bore at very slight small inclination and azimuth differences to avoid significant dogleg. Reference: Rio Oil & Gas Expo and Conference 2020, From TLWP: Lessons Learned From Voluntary and Involuntary Sidetracks, Rohlfs de Macedo et al., IBP0804_20 (to be published December 2020). Edit | Details | Delete
892375019 Merged Use Case rubber banding log Merge the drilling and wireline workflows Edit | Details | Delete
1014927450 Drilling inform G&G Personnel about TVD uncertainty from ground level Convey TVD uncertainty in reference to ground level Tabulations of well survey data is typically to 2 decimal places when the uncertainty, at deeper depths, is in whole meters / feet and multiples thereof. This is misleading to the end user and subsurface modelling (especially cross correlation of pressures) suffers badly. A common representation of uncertainty on shared TVD data is needed to ensure end users take into account the real uncertainty Edit | Details | Delete
1067936688 Inconsistent Formation Tops Convey requirements for wellbore position uncertainty associated with formation tops. Ensure that the surveying program is sufficient to provide reliable formation tops position such that the G&G team can update reliably their earth model. Edit | Details | Delete
1093533823 Confusion around vertical datum Convey which origin is used for depth measurements. Different disciplines may use different depth datum. Edit | Details | Delete
1604153383 Combined Edit | Details | Delete
1621466709 Geo-modeler inform Drilling about TVT uncertainty from ground level #2 Convey TVD depth uncertainty. The earth model has uncertainty on the true stratigraphic thickness of each formation layers. The TVT needs to be conveyed to the drilling team based on the planned well path. Edit | Details | Delete
1654115660 Geological and driller’s Targets Convey geological target boundaries as constraints for surveying program Capture the geological target boundaries, pass them to drilling engineering, and use them to design the wellbore surveying program. Edit | Details | Delete
1664894891 Geo-modeler inform Drilling about TVT uncertainty from ground level #3 Convey TVD depth uncertainty. The earth model has uncertainty on the true stratigraphic thickness of each formation layers. The TVT needs to be conveyed to the drilling team based on the planned well path. Edit | Details | Delete
1709555939 Simplified Formation Evaluation Log from Wireline Describe in a simple manner how a formation evaluation log is acquired during a wireline operation It is a part of the rubber banding log depth use case. See example from Dashevskiy et al., 2008, Dynamic Depth Correction to Reduce Depth Uncertainty and to Improve MWD/LWD Log Quality, SPE Drilling and Completions, page 13-22 Edit | Details | Delete
1710961388 Geo-modeler inform Drilling about TVT uncertainty from ground level #1 Convey TVD depth uncertainty. The earth model has uncertainty on the true stratigraphic thickness of each formation layers. The TVT needs to be conveyed to the drilling team based on the planned well path. Edit | Details | Delete
1819936884 Directional driller convey wellbore position with uncertainty to operation geologist Convey wellbore position uncertainty relative to last observed geological marker Describe wellbore position uncertainty relatively to an uncertain event. Edit | Details | Delete
1838457663 Formation Evaluation Log from Wireline Describe how a formation evaluation log is acquired during a wireline operation It is a part of the rubber banding log depth use case. See example from Dashevskiy et al., 2008, Dynamic Depth Correction to Reduce Depth Uncertainty and to Improve MWD/LWD Log Quality, SPE Drilling and Completions, page 13-22 Edit | Details | Delete
1852930419 Combined Edit | Details | Delete
1939344474 test merged graph testing merge functionality Edit | Details | Delete
1987183045 Collision with other wells Convey Depth uncertainty with regards to potential collisions with other wells Change of azimuthal direction can impact the axial uncertainty and therefore the probability to intersect another well Edit | Details | Delete
1987350416 Validation Edit | Details | Delete
2003145701 Rubber-banding of logs Convey TVD uncertainty in logging depth. A set of MWD logs is to be compared to wireline logs. The MWD and Wireline log sets were measured with a different depth measurement systems, each subjected to independent stretch errors. One of the measured depths has to be stretched or shrunk by matching similar features across the MWD and wireline logs.Example from Dashevskiy et al., 2008, Dynamic Depth Correction to Reduce Depth Uncertainty and to Improve MWD/LWD Log Quality, SPE Drilling and Completions, page 13-22 Edit | Details | Delete
2010684122 Wellbore position QAQC operational procedure Perform adequate QAQC wellbore surveying procedures. Through QAQC wellbore surveying procedures, new survey may be required to decrease uncertainty and/or trajectory uncertainty may be improved by using sensor fusion methods. Edit | Details | Delete
2113688638 Geo-modeler inform Drilling about TVT uncertainty from ground level #3 Convey TVD depth uncertainty. The earth model has uncertainty on the true stratigraphic thickness of each formation layers. The TVT needs to be conveyed to the drilling team based on the planned well path. Edit | Details | Delete
2131093800 Rubber-banding of logs Convey TVD uncertainty in logging depth. A set of MWD logs is to be compared to wireline logs. The MWD and Wireline log sets were measured with a different depth measurement systems, each subjected to independent stretch errors. One of the measured depths has to be stretched or shrunk by matching similar features across the MWD and wireline logs.Example from Dashevskiy et al., 2008, Dynamic Depth Correction to Reduce Depth Uncertainty and to Improve MWD/LWD Log Quality, SPE Drilling and Completions, page 13-22 Edit | Details | Delete