Drillstring Design and Failure Prevention for Improved Drilling Efficiency

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Disciplines: Completions | Drilling

Course Description

The course will address the drill string components’ features, functions, pipe identifications, failure mechanisms and drilling practices required to prevent/reduce non-productive times associated with string failures. The course will cover two common string failure mechanisms (overload and fatigue failures), causes of the failures, and how to prevent these failures to happen. The drilling assembly selection and design to reduce the failure will be also discussed. “An ounce of prevention is better than a pound of cure;” this saying is very relevant to string failure prevention, which means it is easier to take small steps to prevent string failure from happening than dealing with the problem & its consequences once it is established.

Wash out / twist off problem is one of the common drilling problems related to drill string fatigue failures. The drilling practices related to identifying washout, taking the right decision on time and tripping out of hole before the string twist-off will also be addressed during the session. By the end of the session participants will be able to refresh their knowledge about drill string components and features (e.g. BSR, SRF), design methods, failure mechanisms, BHA selection to reduce fatigue failures, and improve drilling efficiency.

Learning Level

Introductory to Intermediate

Course Length

1 Day

Why Attend

Topics Covered:

• Introduction – Pre-course assessment - Mechanics of the drillstring – Buoyancy and axial force – The root of all problems.
• Drill Pipe (DP): Specifications and functions – DP classification, weights, strength and tensile capacity. Tool joint (TJ) dimensions, torsional strength and makeup torque – DP classification – DP marking.
• BHA (HWDP, DC, Stabilizer): HWDP functions, specifications and properties – DC functions, specification and properties – DC connection bending strength ratio (BSR) –– DC stress relief features – Stiff-to-Limer pipe transition stiffness ratio. Stabilizers, stabilization principles and formation dip. Exercises.
• Drill String Design: Design process – Design factors & assumptions – Selection of BHA type & DC length – String design and failure prevention – Overload design & MOP – Working load and length of DP – DP Burst and Collapse pressures - Combined loading for DP and TJ – Slip crushing – Dope friction factor – Fatigue prevention design – Washout – Twist-off – Drilling practices – Exercise.

Who Attends

From the operating company: drilling engineers, senior drilling engineers, drilling superintendent, drilling supervisors, drilling fluid specialist.

From the rig contractor and service providers: drilling superintendents, tool pushers, tour pushers, drillers, assistant drillers, mud engineers, mud loggers, directional drillers and any drilling personnel who wants to improve/refresh his knowledge and understanding in this technical area.

Including the rig site crew with the operator’s team in these technical training courses provides significant results and maximum benefit to the drilling and completion operation.

Special Requirements

Participants should have basic skills in both drilling engineering and math. Participants must have a scientific calculator for use in the session.

CEUs

0.8 CEUs are awarded for this 1-day course.

Cancellation Policy

All cancellations must be received no later than 14 days prior to the course start date. Cancellations made after the 14-day window will not be refunded. Refunds will not be given due to no show situations.

Training sessions attached to SPE conferences and workshops follow the cancellation policies stated on the event information page. Please check that page for specific cancellation information.

SPE reserves the right to cancel or re-schedule courses at will. Notification of changes will be made as quickly as possible; please keep this in mind when arranging travel, as SPE is not responsible for any fees charged for cancelling or changing travel arrangements.

We reserve the right to substitute course instructors as necessary.

Instructor

Other courses by this instructor