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Use Of Torque & Drag Programs For BHA Weight Evaluation

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Use Of Torque & Drag Programs For BHA Weight EvaluationThese programs have a wide range of applications, but have mainly beenused to evaluate drillstring design integrity and alternative well plans forhorizontal wells or complex, unusual directional wells. However, theprogram can be used to check...

The E*C TRAK Torque and Drag Module

The E*C TRAK Torque and Drag ModuleThis program, developed at the Drilling Research Center in Celle,Germany, is used to calculate torque and drag when a friction factor(coefficient of sliding friction) is known or estimated. It will calculate thefriction factor when either torque or hookload is known.Software...

Computer Models of Drillstring Friction

Computer Models of Drillstring FrictionProper evaluation of drillstring friction requires the use of a computerprogram. These programs analyze drillstring friction for rotary drilling aswell as drilling with no drillstring rotation.These mathematical models make a number of simplifying assumptionsand...

Torque & Drag

Torque & DragSeveral factors affect hole drag, including hole inclination, dogleg severity,hole condition, mud properties, hole size, and drillstring component types,sizes and placement. However, as mentioned earlier, in drilling situationswhere the drillstring is not rotated (as when a steerable...

Calculating BHA Weight With Drill Pipe In Compression - Summary

Calculating BHA Weight With Drill Pipe In CompressionSummary• When drilling vertical wells, ordinary drill pipe must NEVER be runin compression, in any hole size. Therefore, sufficient BHA weightmust be used to provide all the desired weight on bit with anacceptable safety margin, except at higher inclinations.•...

BHA Weight For Steerable Motor Assemblies

BHA Weight For Steerable Motor AssembliesIn practice, BHA weight for steerable assemblies on typical directionalwells is not a problem for the following reasons.• The WOB is usually fairly low, especially when a PDC bit is used.• When the drillstring is not rotated, the drill pipe is not subjected to...

BHA Requirements When The Drillstring Is Not Rotated

BHA Requirements When The Drillstring Is Not RotatedAs stated earlier, when the drillstring is rotated, the component of slidingfriction (drag) is small and may be compensated for by using a safety factorin BHA weight calculations. Drillstring friction for rotary assemblies willmainly affect torque...

Calculating Critical Buckling Force

Calculating Critical Buckling ForceCalculate the critical buckling load for 4.5-inch grade E drill pipe with anominal weight of 16.6 lb/ft (approximate weight 17.98 lb/ft; tool joint OD6.375 inches: from...

Tubulars - Make-Up Torque

Make-Up TorquePart of the strength of the drillstring and the seal for the fluid conduit areboth contained in the tool joints. It is very important therefore, that thecorrect make-up torque is applied to the tool joints. If a tool joint is nottorqued enough, bending between the box and pin could cause...

Tubulars - Tool Joints

Tool JointsTool joints are short sections of pipe that are attached to the tubing portionof drill pipe by means of using a flash welding process. The internallythreaded tool joint is called a “box”, while the externally threaded tool jointif the “pin”.API specifications also apply to tool joints:• Minimum...

Tubulars - Drill Pipe Classification

Drill Pipe ClassificationDrill pipe class defines the physical condition of the drill pipe in terms ofdimension, surface damage, and corrosion. Drill pipe class is indicated bypaint bands on the drill...

Tubulars - Drill Pipe Grades

Drill Pipe GradesThere are four common grades of drill pipe which define the yield strengthand tensile strength of the steel being used.Grade E, composed of a lower grade of steel, is sometimes referred...

Tubulars - Drill Pipe Yield Strength and Tensile Strength

Drill Pipe Yield Strength and Tensile StrengthIf drill pipe is stretched, it will initially go through a region of elasticdeformation. In this region, if the stretching force is removed, the drill pipewill return to its original dimensions. The upper limit of this elasticdeformation is called the Yield...

Tubulars - Introduction

TubularsIntroductionDrill pipe and collars are designed to satisfy certain operationalrequirements. In general, downhole tubulars must have the capability towithstand the maximum expected hookload, torque, bending stresses,internal pressure, and external collapse pressure. Operational capabilitiesof...

Drillstring Basics

Drillstring BasicsUpon completion of this section you will be able to:• Explain how drill pipe grades define the yield strength and tensilestrength of steel.• Explain how drill pipe is classified.• Calculate total yield strength for a specific grade/class of drill pipe.• Explain the effects of buoyancy...

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