Casing Design Workshop: Course Overview COPYRIGHTcloud1.activelearner.com/contentcloud/portals/hosted3/PetroAcademy/... · • Casing Setting Depth Determination • Casing Size Selection

Casing Design Workshop: Course Overview

(Last Updated 19 February 2016)

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James Bobo

Casing Design Workshop

PetroSkills / OGCIFundamentals of Casing

Design

Course Content

Introduction

Casing• Casing and Connections• Casing Setting Depth Determination• Casing Size Selection• Casing Loads for Design• Casing Design ─ Preliminary & Final• Casing Running & Landing Practices

Course Objectives

Apply both theory and practice of casing selection and design on a fundamental level

Design a basic casing string using industry accepted practice• Determine setting depths and casing sizes• Calculate load cases• Select casing to meet load criteria• Adjust design for combined loading

Describe best running practices

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© PetroSkills, LLC., 2016. All rights reserved._____________________________________________________________________________________________

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Course Objectives

What you learn from this course will be applicable to designing casing on 100% of the wells drilled in the world today

With some mentorship, you will walk-away being able to design a casing string to be run in the ground on 85%+ of the wells drilled in the world today

The remaining wells will be addressed in post-work shop bolt-ons

Course Materials

Textbook

Course manual (includes copies of slides)

Graph paper and worksheets

USB:• MS Excel Spreadsheet for some casing calculations (USC and SI

versions)• Extras (Cementing Data Handbook)

The Course Manual

Same sequence as course

Recently revised, may still contains typos

Please help find errors

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© PetroSkills, LLC., 2016. All rights reserved.

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Textbook

Casing and Liners for Drilling and Completion, Ted G Byrom, 2007

First printing March 2007

Second printing March 2008

Third printing 2010

Errata sheet provided in course manual (after Preface)

Help find any other errors

Calculations & Formulas

Casing Design – requires calculations

Manual Calculations – for learning

Computers – after you learn

Course Conventions We will Use

Units of measure

Equations & formulas

Differential pressures

Round off

Coordinate systems• Cartesian• Polar Cylindrical



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Units of Measure

Typical oilfield units (USC – US Customary)• in., ft, gal., bbl, lb, ppg, psi, etc.• Not a consistent system• Prevalent in most of the world and SPE literature

Formulas & Unit Conversion Factors• Physical models (formulas) are unit independent• Most formulas here do not contain unit conversion factors• Unit conversion factors often confuse formulas• We will show you where they are needed

Unit Conversion Factors• Chapter 9 of manual

SI version of exercises also in Chapter 10

Equations and Formulas

All equations & formulas – algebraic form• One letter or symbol for a variable• Subscript identifiers• Multi-letter acronyms not allowed – too confusing

Example: hook load

hook b bit

b

force

buoyancy factor

weight per unit length

vertical length

f k w h f

f

k

w

h

Differential Pressures

API/ISO tables and formulas: both collapse and burst pressures are positive, therefore:

• Collapse pressure – outside pressure minus inside pressure

• Burst pressure – inside pressure minus outside pressure

• Not ideal but consistent with API/ISO pressure ratings

i o 0p p p

o i 0p p p

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Round Off

Rounding Numbers* • API/ISO pressure ratings – rounded to the nearest 10 psi• Casing depths – rounded to the nearest 10, 50, or 100 ft.

IN THIS COURSE – limited round off: • For pressures or depths in most examples • So that you may verify your own calculations

* see textbook for discussion

Coordinate Systems (Cartesian)

For well bore orientation:

• Up is negative z, South is negative x, and West is negative y

x (North)

y (East)

z (Down)

Coordinate Systems (Polar Cylindrical)

For tubular calculations• Radius, r• Angle, • Axis, z

Origin• z , arbitrary• , arbitrary• r , central axis



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Quick Review of Casing

Primary Purpose of Casing: maintains borehole integrity• Prevent collapse• Prevent formation fracture• Contain formation fluids• Contain circulating fluids

Additional Purposes:• Structural: surface and/or conductor supports wellhead, BOP, other

strings of pipe, and sometimes small platforms

API Casing

Many Standard Sizes: 4 ½ in – 20 in

Various “weights”: wall thickness

Eleven Grades: (Yield) 40 – 125 ksi

Connections: 4 types

Lengths: 16 – 48 ft

Proprietary Casing

Proprietary Connections

Special sizes (diameter and wall thickness)

Special purpose alloys

Uses:• High pressures, high tensile and collapse loads• High Temperatures• Corrosive applications• Special clearance problems

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Casing Applications

Types of Casing Strings• Conductor casing• Surface casing• Intermediate casing• Production casing• Drilling liner• Production liner• Tie-back casing

How to determine size and depths?

Course Schedule

Introduction

Pre-work

Virtual sessions

Optional post-work

Pre-assessment exam

Based on chapters 1, 2, 3 & 8 of the current FCD course

Optional reading, exercises and video clips with bulletin board for group questions and discussion, as needed on an exception basis

Exam results confirm that everyone is “on the same page” ready to “design casing for a well”



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Pre-assessment Exam Options

Pass the over-all exam and each section—ready for workshop

Pass the over-all exam but fell short on a couple of sections—review material related to sections where you fell short

Don’t pass the over-all exam (75%)• Review the existing sections and take it again• Wait until Basic/Foundation modules exist• Request a synchronous session to review materials

Virtual Sessions

Theory and “hands-on” of casing design

Includes asynchronous work of casing load and selection calculations

Asynchronous sessions may range from 5-15 hours individually

Six virtual sessions will be 2-3 hours

May be offered MWF for two weeks or

MTh for three weeks

Questions

DO NOT HESITATE TO ASK ANY QUESTION PERTINENT TO THE TOPIC OF DISCUSSION

• Your understanding is important• Most of this course builds upon prior topics, ensure you understand

before we move on to the next topic• Sometimes I may defer an answer when that topic will be covered in

detail later• Posting questions is especially crucial in our blending learning

environment

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The Cone of Learning

Learning Approach in This Course

You will read

You will hear

You will see

You will say

You will do

With some repetition to reinforce learning and retention

We Learn From Each Other

Who are we?

Where do we work?

What is our experience?

What do we expect to learn?



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Who is James Bobo?

“Okie from Muskogee”

BSPE University of Tulsa, 1977

Experience by decade includes drilling, production, special projects, back to drilling

Well control, directional drilling, drilling programs

Real-time data center, field data gathering systems, enterprise-wide “back-room” systems, gas processing, project management, adult learning

Licensed engineer, developer of P&P exam & SPE competency exam

Tell Us About You

Name

Company

Where you work

Experience

Have you ever designed a casing string that has been run in the ground?

If yes, for the different well types, please describe the well schematics with number of casing strings, TVD, MD and MW on each interval

Have you ever designed a casing string “on paper”?

What do you expect to learn in this course?

Questions?

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Casing Design Workshop: Course Overview COPYRIGHTcloud1.activelearner.com/contentcloud/portals/hosted3/PetroAcademy/... · • Casing Setting Depth Determination • Casing Size Selection