Fundamentals of Drilling Course Outline
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1 Fundamentals of Drilling Course Outline (1)Basics of Rotary Drilling (2)Rotary (3) Operations/Coring Directional Drilling (3)Directional -Fields Drilling of Application (4)Fishing-Planning of Well Course (5)Casing/Cementing -Reasons for Hole Deviation (6)Well Control -Measuring Equipment (7)Principles -Steering of Drilling Equipment Fluid Technology (8)Principles of Borehole Stability (9)Principles of Hydraulic Testing
2 Reasons for Directional Drilling/Deviation Control (1) to reach a planned target area Paired Targets Geothermal Many beneath Wells Wells from inaccessible the samesites Relief wells Site (offshore) to control a blowout
3 Reasons for Directional Drilling/Deviation Control (2) to obtain/control a planned hole trajectory Preventing Hole Deviation Limiting Crookedness (Dog Leg Severity) Dogleg Abrupt Change Of Inclination/Azimuth Drilling Horizontal Wells
4 Reasons for Directional Drilling/Deviation Control (3) to sidetrack or abandon a portion of a hole
5 Terminology of Directional Well Profiles Kickoff Point KOP Tangent Section Radius of Curvature = Buildup Rate True Vertical Depth TVD
6 Classification of Buildup-Rates
7 Measuring the Wellbore Course A Wellbore Course is a Curve in 3D-Space Inclination I1 Azimuth A1 Measured Depth MD1 Point 1 3D-Curve is determined by 3 Coordinates X= West-East Y= South-North Z= Vertical Depth Coordinates must be determined from Measurements between 2 Points of the Hole Point 2 Inclination I2 Azimuth A2 Measured Depth MD2
8 Calculation of Coordinates by Radius of Curvature Method Section between 2 Survey Points is assumed to be a spherical arc Radius of Curvature 3D-Coordinates Spherical arc Dogleg Severity (DLS) means Curvature of the Hole expressed in Degrees/100ft DLS is critical for!building of Keyseats!Torque and Drag!Casing Running Operation!Running Logging Sondes DLS=100/ MD*arccos(cos I1*cos I2+sin I1*sin I2*cos(A2-A1))
9 Key Seat Buildup in Doglegs
10 Instruments for Directional Measurements Gyroscope The Challenge is to integrate these sensible instruments in the downhole equipment and to transmit data while drilling
11 Directional Measurements with Wireline Transmission Side Entry Sub Principle of Steering Tool Drillstring nonrotating Bit rotated by DHM
12 Measurement While Drilling (MWD) Techniques Positive Pressure Signal transmitted by Mud Electromagnetic Transmission
13 Why hole deviation occurs Equilibrium of Forces at Bit Cartwheel Analogy Point of Tangency
14 Why hole deviation occurs Influence of Formation Anisotropy Situation without Formation Influence Basic Assumption Formations have higher drillability perpendicular to the bedding plane than parallel to it Equilibrium Angle
15 Equilibrium Angle dependent on Foliation Dip Angle, Factor of Anisotropy and WOB Calculated for 6 -Borehole
16 Controlling Hole Inclination by Bottom Hole Assembly (BHA) BHA=Assembly of Drill Collars and Stabilizers Stabilizers
17 Principle of Packed Hole Assemblies Basic Idea 3 Points define Borehole Curvature
18
19 Controlling Hole Inclination with Adjustable Stabilizers
20 Controlling Wellbore Trajectory with Steerable DHM
21 Types of Downhole Motors used for Directional Drilling Positive Displacement Motor (PDM) Turbine Type Motor Characteristics of PDM Low Medium RPM High Torque Ideal for Roller Cone Bits Characteristics of Turbines High RPM Ideal for Diamond Bits
22 Positive Displacement Motor Components
23 Performance Characteristic of a Positive Displacement Motor PDM can be adjusted to wide range of operating conditions
24 Performance Characteristic of Drilling Turbines Power and Rotational Speed slow down when high torque is required Stalling Torque Rotational Speed
25 Vertical Drilling System used in KTB Ultradeep Hole
26 Wellbore Course of KTB Pilothole and Ultradeep hole North Horizontal Projection KTB Pilothole Ultradeep hole Drilled with Vertical Drilling Systems East
27 Directional Drilling with DHM-Steering KTB - vertical drilling Systems system
28 Open Hole and Cased Hole Sidetracking with a cement plug
29 Sidetracking with Oriented Whipstock Technique
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