Drill String Design and BHA Optimisation
تصميم عمود الحفر وتحسين تجميعة قاع البئر
- Next date
- Available in-house
- Fees from
- —per delegate
- Formats
- In-house training0 sessions
- Duration
- 5 daysCertificate
Overview
The drill string and bottom hole assembly transmit weight, torque and drilling fluid to the bit, and they strongly influence rate of penetration, directional control, hole quality and the risk of failures. Drill string washouts, twist-offs, fatigue cracks and buckling are among the most common causes of non-productive time and costly fishing operations. Poorly designed BHAs can lead to vibration, bit damage, poor directional performance and stuck pipe. Sound drill string design and BHA optimisation are therefore essential skills for drilling engineers, especially in deep, deviated, extended reach and high-pressure wells.
This course provides a practical understanding of drill string design, BHA selection and drilling performance optimisation. Participants learn drill pipe, heavy-weight pipe and drill collar properties, tool joints and connections, and design methods based on API RP 7G and industry standards. The course covers tension, torsion, collapse and burst calculations, buckling and neutral point concepts, and torque and drag analysis. It also explains BHA components, stabiliser placement, directional BHAs and rotary steerable systems, drilling vibrations and their mitigation, fatigue and failure prevention, inspection programmes and the use of real-time data to optimise performance.
Objectives
- Describe drill pipe, heavy-weight pipe, drill collars and connection properties
- Design drill strings for tension, torsion, collapse and burst using API RP 7G
- Understand buckling, neutral point and weight on bit limitations
- Perform torque and drag analysis for deviated and extended reach wells
- Select BHA components and stabiliser placement for directional objectives
- Identify drilling vibrations and apply practical mitigation methods
- Prevent drill string fatigue and failures through design and inspection
Who should attend
Drilling engineers, drilling supervisors, directional drillers, rig superintendents and engineers involved in well planning and drilling performance.
Training methodology
The course combines technical explanation with design calculations based on real well plans and drilling data. Participants design drill strings for vertical and deviated wells, check tension and torsion limits, calculate the neutral point and run torque and drag scenarios using spreadsheets and software outputs. BHA designs are reviewed against directional and vibration objectives, and real-time drilling data is analysed to identify vibration modes and dysfunctions. Photographs of failed pipe and connections support failure analysis exercises. Each day ends with a short quiz and discussion of drilling problems in participants' own wells.
Programme outline
Day1Drill String Components and Properties
- The functions of the drill string and its impact on drilling performance and safety
- Drill pipe grades, dimensions, classes and the meaning of premium and used pipe
- Heavy-weight drill pipe, drill collars and their role in providing weight on bit
- Tool joints, rotary shouldered connections, make-up torque and thread compounds
- API RP 7G, API Spec 5DP and other standards used in drill string design
- Drill string inspection categories and the selection of inspection methods
- Practical exercise: reading drill pipe and collar data sheets and selecting components
Day2Drill String Design Calculations
- Tension design, margin of overpull and the effect of buoyancy on string weight
- Torsional limits of pipe and connections and combined tension and torsion loading
- Collapse and burst checks for drill pipe during drill stem tests and well control
- Neutral point, buckling and the limits on weight on bit in vertical and deviated wells
- Slip crushing, bending stresses and other special loading cases on the rig floor
- Drill string design for deep, high-pressure and sour service wells
- Practical exercise: complete drill string design for a deep deviated well
Day3Torque, Drag and Hydraulics
- Torque and drag fundamentals, friction factors and their calibration from rig data
- Torque and drag modelling for build, hold and drop profiles and horizontal wells
- Extended reach drilling limits and methods to reduce torque and drag
- Drill string hydraulics, pressure losses and the effect on hole cleaning
- Hole cleaning in deviated wells, cuttings beds and their effect on torque and drag
- Real-time torque and drag monitoring to detect hole problems early
- Practical exercise: running torque and drag scenarios for an extended reach well
Day4BHA Design and Directional Performance
- BHA components: bits, stabilisers, reamers, jars, shock subs and MWD and LWD tools
- Stabiliser placement and the behaviour of packed, pendulum and building assemblies
- Steerable motor assemblies and their use for directional drilling control
- Rotary steerable systems and their benefits for hole quality and drilling efficiency
- BHA modelling to predict directional tendencies and side forces on the bit
- Jar placement in the BHA and its effectiveness in freeing stuck pipe
- Practical exercise: designing BHAs for vertical, tangent and build sections of a well
Day5Vibration, Fatigue and Failure Prevention
- Drilling vibration modes including axial, lateral, torsional, stick-slip and whirl behaviour
- Detecting vibration with downhole and surface measurements and real-time data
- Vibration mitigation through parameter changes, BHA design and specialised tools
- Fatigue mechanisms, washouts and twist-offs and their root causes in drill strings
- Inspection programmes, failure tracking and lessons from drill string failures
- Group exercise: analysing a drill string failure and recommending design changes
- Final assessment and discussion of drilling problems in participants' own wells
Dates and fees
There are no scheduled dates for this course at the moment. Request it as in-house training, or ask us about the next date.
Certificate
Every delegate who attends the full programme receives a Harfard Technology certificate of completion stating the course title, duration, dates and venue.
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