Casing Design Workshop: Final Surface Casing Design with Combined Loads Exercise. (Last Updated 16 December 2015) COPYRIGHT

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Della Griffin
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1 Casing Design Workshop: Final Surface Casing Design with Combined Loads Exercise (Last Updated 16 December 15)

2 NOTICE AND DISCLAIMER The information contained herein and/or these workshop/seminar proceedings (WORK) was prepared by or contributed to by various parties in support of professional continuing education. For purposes of this Disclaimer, Company Group is defined as PetroSkills, LLC.; OGCI Training, Inc.; John M. Campbell and Company; its and their parent, subsidiaries and affiliated companies; and, its and their co-lessees, partners, joint ventures, co-owners, shareholders, agents, officers, directors, employees, representatives, instructors, and contractors. Company Group takes no position as to whether any method, apparatus or product mentioned herein is or will be covered by a patent or other intellectual property. Furthermore, the information contained herein does not grant the right, by implication or otherwise, to manufacture, sell, offer for sale or use any method, apparatus or product covered by a patent or other intellectual property right; nor does it insure anyone against liability for infringement of same. Except as stated herein, COMPANY GROUP MAKES NO WARRANTIES, EXPRESS, IMPLIED, OR STATUTORY, WITH RESPECT TO THE WORK, INCLUDING, WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Company Group does not guarantee results. All interpretations using the WORK, and all recommendations based upon such interpretations, are opinion based on inferences from measurements and empirical relationships, and on assumptions, which inferences and assumptions are not infallible, and with respect to which competent specialists may differ. In addition, such interpretations, recommendations and descriptions may involve the opinion and judgment of the USER. USER has full responsibility for all interpretations, recommendations and descriptions utilizing the WORK. Company Group cannot and does not warrant the accuracy, correctness or completeness of any interpretation, recommendation or description. Under no circumstances should any interpretation, recommendation or description be relied upon as the basis for any drilling, completion, well treatment, production or other financial decision, or any procedure involving any risk to the safety of any drilling venture, drilling rig or its crew or any other individual. USER has full responsibility for all such decisions concerning other procedures relating to the drilling or production operations. Except as expressly otherwise stated herein, USER agrees that COMPANY GROUP SHALL HAVE NO LIABILITY TO USER OR TO ANY THIRD PARTY FOR ANY ORDINARY, SPECIAL, OR CONSEQUENTIAL DAMAGES OR LOSSES WHICH MIGHT ARISE DIRECTLY OR INDIRECTLY BY REASON OF USER S USE OF WORK. USER shall protect, indemnify, hold harmless and defend Company Group of and from any loss, cost, damage, or expense, including attorneys fees, arising from any claim asserted against Company Group that is in any way associated with the matters set forth in this Disclaimer. The Content may not be reproduced, distributed, sold, licensed, used to create derivative works, performed, displayed, transmitted, broadcast or otherwise exploited without the prior written content of the Company Group. Use of the WORK as a reference or manual for adult training programs is specifically reserved for PetroSkills, LLC. All rights to the WORK, including translation rights, are reserved. PETROSKILLS, LLC., 16 THIS WORK IS ED BY PETROSKILLS, LLC. AND DISTRIBUTED UNDER EXCLUSIVE LICENSE BY PETROSKILLS, LLC.

3 Casing Design Workshop Exercise: Final Surface Casing Design with Combined Loads Casing Design Workshop API Bi-axial Collapse Method Applied Use yield and tensile stress, calculate reduced yield with bi-axial yield equation Use appropriate collapse formula, calculate reduced collapse pressure Adjust casing design if necessary and recheck The Historical API Procedure Historical API Biaxial Procedure Calculate Axial Stress (Axial Load/Area of Tube) Calculate Effective Yield Stress 3 z z Ye Y 1 4 Y Determine Applicable API Collapse Formula (Using d o /t and the Effective Yield Stress) Calculate Reduced Collapse (Using the Applicable API Formula) PetroSkills, LLC., 16. All rights reserved. 1

4 Final Surface Casing Design with Combined Loads Example Final Casing Design Casing Design Summary 13 3/8" Surface Casing Safety Factor ** Section Joint Strength Number OD ID Weight Grade Connection Bottom Length Collapse Burst K-55 ST&C K-55 ST&C Totals: 3 Does not include bi-axial effects Minimum Design Factors Mud Weight: 9. ppg Collapse: 1.15 Burst: 1.15 Tension: 1.6/1, ** Safety Factor: Strength / (k D * Load) Tension Load (Running) Depth (ft) Axial Load (1 lb) Collapse Check Procedure Surface Casing Axial Loads True Axial Load Running Use true axial load (running case) No tension at the bottom Tension at bottom of 54.5 lb/ft section: 37, lb (from load line) at 1 ft TVD Calculate axial stress Calculate effective yield Calculate reduced collapse Calculate actual design load & compare it to pipe reduced collapse strength PetroSkills, LLC., 16. All rights reserved.

5 Casing Design Workshop Axial Stress 4 37 z psi Effective Collapse Yield Calculate API Constants For Y e = psi A = B = C = F = G = z z Ye Y 1 4 Y Ye Y psi e Use API formulas to calculate these constants (in manual and textbook) Your course spreadsheet will also make this calculation PetroSkills, LLC., 16. All rights reserved. 3

Final Surface Casing Design with Combined Loads Calculate d/t d d d o o o do t 1 do di 13.375 t.5 13.375 1.615 t 35.

6 Final Surface Casing Design with Combined Loads Calculate d/t d d d o o o do t 1 do di t t 35. Determine API Collapse Formula Use the range formulas for each collapse formula to see which formula is appropriate (see manual for calculations) We determine that the correct collapse formula is the Transition Collapse Formula Or we could use the chart (next slide): d o /t = 35. Y e = psi Collapse Formula Range 4 PetroSkills, LLC., 16. All rights reserved.

7 Casing Design Workshop Calculate Reduced Collapse F pt Y G do t pt p 116 psi T Adjust the Design? The reduced collapse value is 116 psi The API value is 113 psi API rounds collapse pressures to nearest 1 psi If we round our result to nearest 1 psi then they are the same value No adjustment of the surface casing necessary New Formula? In the manual the reduced collapse is also calculated with the new API/ISO formula The reduced collapse is 1133 psi with the new formula (116 with historic formula) so there is no need for adjustment with the new formula either PetroSkills, LLC., 16. All rights reserved. 5

Casing Design Workshop: Alternatives and Contingencies. (Last Updated 16 December 2015) COPYRIGHT

Casing Design Workshop: Alternatives and Contingencies (Last Updated 16 December 2015) NOTICE AND DISCLAIMER The information contained herein and/or these workshop/seminar proceedings (WORK) was prepared