MPET_curso Directional Drilling_with answers part2.pdf -...

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WELL PLANNING54Well Trajectory Design
Some Well Planning TermsA. Jamieson
Some Well Planning TermsA. Jamieson
Some Well Planning TermsA. Jamieson
Some Well Planning TermsA. Jamieson
Some Well Planning TermsA. Jamieson
Some Well Planning TermsA. Jamieson
Some Well Planning TermsA. Jamieson
Some Well Planning TermsA. Jamieson
Some Well Planning TermsA. Jamieson
Some Well Planning TermsA. Jamieson
Some Well Planning TermsA. Jamieson
Well shape: Vertical WellA. Jamieson
Well Profile: ‘Slant’ (Build and Hold) WellA. Jamieson
Well shape: ‘S’ WellA. Jamieson
Well shape: Double Build HorizontalA. Jamieson
Well shape: Complex 3D DesignA. Jamieson
71Additional vocabularyWiki aapgLong Radius:Most common horizontal wellsWhen large horizontal displacement isdesiredMore than4000 ftof horizontal sectioncan be drilled after reaching a 90 °inclinationUse of conventional directional drillingtoolsMedium Radius:When build rates of greater than 15°per100 ft: BHAs with a double bend areusedDouble bent BHA are used only in asliding mode since rotation can causepremature downhole failuresShort Radius:change from vertical to horizontal withina 30-to 90-ft window.horizontal sections extend 200 to400 ftSpecial directional equipment used
Well planning recommendationsUse achievable doglegsKick off depth in stable rockAccommodate trajectory with casing shoeMake sure collisions are avoidedBuild in contingency tangents before targetsKnow completion limitationsPerform Torque & Drag simulationsUse feedback from the Directional Driller who knows the field andwill do the job on the rigKeep it simple
VocabularyMeasured Depth (MD) = depth along the wellbore (ft)True Vertical Depth (TVD) = depth projected on the vertical (ft)Kick Off Point (KOP) = depth where starting to build angle (ft)Build=Change in Inclination (°) -increaseBuild Up Rate (BUR)= Build / 100ftDrop = Change in Inclination (°) -decreasingDrop Of Rate (DOR) = Drop / 100ftTurn = Change in Azimuth(°)Turn Of Rate= Turn / 100ftDogleg = Curve Angle (°)Dogleg Severity (DLS) = Dogleg / 100ftEnd Of Build (EOB) = point when the build section finishes

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Term
Spring
Professor
N/A
Tags
Wind, BHA, Directional drilling, A Jamieson

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