Design Factors Collapse Corrected

Slides:



Advertisements
Similar presentations
Limit States Flexure Shear Deflection Fatigue Supports Elastic Plastic
Advertisements

Well Design PE 413 Introduction and API Standards of Casing
PETE 411 Well Drilling Lesson 17 Casing Design.
PETE 203 DRILLING ENGINEERING
Drilling Program By: Ghanim K. Al Najrani. Casing Design Cementing Design Completion Design Drilling Time Drilling Program.
Piston Assembly Gas and Inertia forces are applied. Gas and Inertia forces are applied. Both of these forces are variable in Both of these forces are variable.
Introduction to Axially Loaded Compression Members
4 Pure Bending.
DRILLING ENGINEERING Well Control.
Lesson 14 Jet Bit Nozzle Size Selection
LRFD-Steel Design Dr. Ali Tayeh Second Semester
Section 3 design of post-tensioned components for flexure Developed by the pTI EDC-130 Education Committee lead author: trey Hamilton, University of.
Wall Form Design Example (Continued)
Granite Wash Casing Profile Texas Panhandle (District 10) Western Oklahoma OKC Granite Wash Conference – March 6, 2008.
PETE 203 DRILLING ENGINEERING
Lesson 36 Torque and Drag Calculations
Home Work #4 Due Date: 18 Mar, 2010 (Turn in your assignment at the mail box of S581 outside the ME general office) The solutions must be written on A4.
Plastic Deformations of Members With a Single Plane of Symmetry
Sample Problem 4.2 SOLUTION:
Static and Fatigue Bolt Design
Laminar Flow in Pipes and Annuli
Drilling Engineering – PE311 Rotary System
Lesson 10 Drilling Hydraulics (cont’d)
10 Pure Bending.
Drilling String Design
COLUMNS. COLUMNS Introduction According to ACI Code 2.1, a structural element with a ratio of height-to least lateral dimension exceeding three used.
PETE 411 Well Drilling Lesson 9 Drilling Hydraulics - Hydrostatics.
Lesson 18 Casing Design Example
Well Design PE 413.
Plastic Deformations of Members With a Single Plane of Symmetry
Lecture 21 – Splices and Shear
University of Palestine
Casing Design.
MAE 343-Intermediate Mechanics of Materials QUIZ No.1 - Thursday, Aug. 26, 2004 List three possible failure modes of a machine element (5points) List the.
Chapter 5 Drilling Techniques and Drilling Problems
Structural Engineering
Bearing Capacity ظرفيت باربري.
Deformation of Axially Loaded Members - Single Member
Practical Design of PT Buildings
Chapter 5 Introduction to Axially Loaded Compression Members.
PRESSURE VESSEL. 1.Determine the bursting steam pressure of a steel shell with diameter of 10 inches and made of ¼ in thick steel plate. The joint efficiency.
Shaping operations are generally divided into three groups based upon how the parent metal flows or deforms during the shaping process ,namely Bending.
Design Factor Collapse
Chapter VIII Packer and Tubing Forces.
Design Factors The axial load on the casing can be either tensile or compressive, depending on the operating conditions.
Pipe Integrity Check using Finite Element Analysis
CASING.
Chapter 2: Casing Design Introduction and API Standards of Casings
11 Energy Methods.
11 Energy Methods.
Cementing How it is Done
The Thick Walled Cylinder
Chapter 2: Casing Design Casing Selection
Pure Bending.
UNIT-IV SHEAR,TORSION AND BOND.
Buckling & Stability Critical Load
Chapter : 01 Simple Stresses
Poisons Ratio Poisons ratio = . w0 w Usually poisons ratio ranges from
Casing Design Workshop
4 Pure Bending.
Buckling & Stability Critical Load
Structure I Course Code: ARCH 208 Dr. Aeid A. Abdulrazeg
Reinforced Concrete Design-I Design of Axial members
Chapter 2: Casing Design Calculations of Loads on a Casing
Find: Lightest I Beam fy=50,000 [lb/in2] unfactored axial
3 Torsion.
PLASTIC ANALYSIS OF STRUCTURES
Casing Design Workshop
Design Calculations Combination Strings
4 Pure Bending.
Presentation transcript:

Design Factors Collapse Corrected Casing under axial load has an effective yield 15

Design Factors Collapse Corrected Example Compute the corrected collapse-pressure rating for 20”, K55, 133lb/ft for In service conditions where the axial tension will be 1,000,000 lbf. Also compute the minimum external pressure required for a failure if the internal pressure will be 1000 psig. Area of the steel is 38.632”2

Design Factors Collapse Corrected Sub into equation 15

Design Factors Collapse Corrected D/t = 31.496 Collapse will be in transition mode

Design Factors Collapse Corrected For Y = 36,385 F1 = 2.941 F2 = .0446 F3 = 645.1 F4 = 2.101 F5 = .0319 This is the corrected pressure differential, so for an internal pressure 1000 psig, the collapse pressure will be 1267 + 1000 = 2267 psi

Design Factors Collapse Corrected The boundaries for the failure regions also change with the change of yield. Upper limit for Yield – strength collapse

Design Factors Collapse Corrected The Upper limit for Plastic Collapse range The Lower limit for Elastic Collapse range Transition range is between these limits

Design Factors Bending In directional wells, the effect of wellbore curvature and vertical deviation angle on axial stress in the casing and couplings must be considered in the casing design. When a casing is forced to bend, the axial tension on the convex side of the bend can increase greatly. On the other hand, in relatively straight sections of hole with a significant vertical deviation angle, the axial stress caused by the weight of the pipe is reduced.

Design Factors Bending The maximum increase in axial stress, sb, on the convex side of the pipe is given by Crandall and Dahl (1995) sb = ± 0.5EdnK. In oil field units, where dogleg severity, K, is expressed as the change in angle in degrees per 100 ft; E (lbf/in2) = stress/strain is elastic modulus. sb = ± 218dnK. In terms of an equivalent axial force Fab = ± 218dnKAs. In terms of weight per foot of pipe Fab = ± 64dnKwp.

Design Factors Bending Example: Determine the maximum axial stress for 7.625-in, 39-lbf/ft, N-80 casing if the casing is subjected to a 400,000 lbf axial tension load in a portion of a directional wellbore having a dogleg severity of 40/100ft. Assuming uniform contact between the casing and the borehole wall. Note that, the definition for the pipe body yield strength:

Design Factors Bending Solution: Nominal API pipe body yield strength for this casing is 895,000 lbf, and the ID is 6.625. The cross sectional area of steel in the pipe body is A = p/4(7.6252 – 6.6252) = 11.192 in2. The axial stress without bending: 400,000/11.192 = 35,740 psi The additional axial stress on the convex side of the pipe due to the bending sb = ± 218dnK = 218(7.625)(4) = 6,649 psi The total axial stress = 35,740 + 6,649 = 42,389 psi

Designing Casing Program Design Selection Casing strings most met all the future conditions in the well. Drilling -- Completions -- Production Designing Casing Program Start with the smallest string, usually the production string What size is required Completion Frac job Production Lift methods

Design Selection Intermediate casing strings Number depends on hole conditions. The last of the intermediate string must be large enough so that the hole out from under it is large enough for the production casing that is needed. The next string up the hole, another intermediate or surface must be large enough to drill the proper size hole.

Design Selection Basically all wells will have a surface string and production string. The number of intermediate strings depend on the well conditions Formations that cause problems when drilling Under of over pressured zones Frac gradient Lost circulation zones Most of the conditions can be anticipated before drilling the well

Design Pipe Selection Combination Strings For a more efficient design use multiple weights and grades. Differing conditions in the wellbore require different specs. Some cases a liner will be more economical

Design Pipe Selection The string must be designed not to fail while running and during operations. The three failure modes, Tension, Burst and Collapse

Design Pipe Selection Example Intermediate String Tension, the top joint must be able to support the weight of the string. Joint strength Burst, the burst rating of the job joint will control the pressure during well control. Collapse, there will be greater pressure outside the bottom of the string while cementing. The casing tables can be used for Joint Strength and Burst, but collapse must be calculated for the load.