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Directional Drilling II - 5 DaysPrerequisites: Directional Drilling I

Course Content

Survey / Toolface (Offset) Accuracy & Quality ControlWell Planning (Wellz)

Project Ahead

Survey / Toolface (Offset) Accuracy & Quality ControlStudents will differentiate between mechanical sensor failures, unstable gravity values, andmagnetic interference effects by analyzing survey data and quality control plots.

Magnetic CorrectionsEarths Magnetic Field

Magnetic DeclinationApplying Declination CorrectionGrid Corrections

Magnetic North

True NorthGrid North

GEOMAG / MRIP / GEODEC

Output to be used by field engineerJob Geomagnetic SheetGEOMAGENTIC Reference Maps

Example Problems Surface Parameters & Processing

Survey (Hole Position) Processing FlowchartSurface Survey Parameters

Grid Corrections

Downhole Survey ParametersToolface Offset Measurement

Positive Pulse toolstring

Negative Pulse toolstringEM toolstring

Toolface Offset Entry

Positive Pulse toolstringNegative Pulse toolstringEM toolstring

Paperwork Example

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Survey Parameter Analysis

Real-Time Report Example

Validating a Survey Probe Response (Using Excel Spreadsheet)

Real-Time Report Parameters

GtotalGx, Gy, Gz

Bx, By, Bz

MWD Surface Roll TestRotational Checkshots

Algorithm Uncertainty

Downhole Data QC for Field Engineers

Surveying methods

Survey System Accuracy Comparison

Accuracy Limitations (electronic vs. mechanical)Independent Survey Comparisons

Benchmark SurveyCheckshot Survey

Rotational Checkshots

Gyro or Singleshot Survey

Sensor Response & Quality

Hardware FailureHard Failure (saturation, no response)

Soft Failure (sticking, calibration drift, wrong compass, film, batteries)

Gravity Values UnstableRotational Movement During Survey

Axial Movement DuringQuality Control Check (Goxy vs. Gz vs. Gtotal)

Magnetic Values Unstable

Natural Occurrences (solar flares, northern lights, local anomalies)

Cross-axial Magnetic Interference (fish, casing)Axial (Drillstring) Magnetic Interference (improper NMDC spacing)

Drilling in Northern Latitudes (high inclination, E-W direction)

Quality Control Check (Boxy vs. Bz vs. Btotal)Other Factors Affecting Survey Accuracy

Incorrect Inputs into Software (MFS, DIP, Total Correction)BHA Misalignment in BoreholeReal-time MWD Transmission Resolution

Predicting Uncertainty Errors (Spreadsheet)

Possible Azimuth Error Charts

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WELL PLANNING (WELLZ)

Generate Simplified Proposal from given parameters

Instructor Demonstrates

Students use Example #1

Students use Example #2

Edit Elevation Depth from given Well Plan

Instructor DemonstratesStudents use Example #1

Students use Example #2

Edit Target Depth from given Well Plan

Instructor Demonstrates

Students use Example #1Students use Example #2

Compare Survey Reports, Proposed vs. Actual Well Plan

Survey Realtime ReportSurvey Editing

Data Entry & Hole Position Report

Instructor DemonstratesStudents use Example #1

Students use Example #2

Memory/Realtime Survey Report

Determine Possible Uncertainty of Actual Well (excel spreadsheet)

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PROJECT AHEAD

Bottom Hole Assemblies

Principle Configurations

Rotary

SlideDesign Principles

Side forces

Fulcrum PrincipleWeight on Bit

Well Path vs. Well PlanInterpolate

Instructor Demonstrates

Students use Example #1Students use Example #2

ExtrapolateInstructor Demonstrates

Students use Example #1Students use Example #2

Build Rate toTop of Target

Center of Target

Bottom of TargetInstructor Demonstrates

Students use Example #1

Students use Example #2

Desired Toolface Setting to Intersect TargetInstructor Demonstrates

Students use Example #1

Students use Example #2