Casing design презентация

Casing Design Akram Miriyev, May 2014

About Me Studied Petroleum and Natural Gas Engineering in METU 2006-2011 Working at BP 2011- now.

What is Casing ?

Key Topics Properties of Casing API specifications Casing Connections Casing Setting Depth Selection PPFG curve Class problem Burst , Collapse & Tensile Design Load Cases Class Problem

Properties of Casing Dimensional Properties

Properties of casing Drift Diameter Weight of casing Wall thickness

Properties of casing Material properties. API specifies grades to material of casing with different chemical properties. For example : N - 80

API Specifications Standardization institute Several publications to standardize equipment and procedures.

Casing Connections Casing Strings are connected together by connections

API connection (couplings) API connection (couplings) Short Thread Connection STC Long Thread Connection LTC Buttress Thread Extreme Line

Long thread connection Long thread connection Short Thread connection Long thread connection has better sealing capacity. Short thread connection has 8 thread per inch

Casing Connections Long & Short Thread connections are as round type.

Casing Connections Buttress thread connection

Casing Connections Extreme Line Connection

Casing Connections Metal to Metal and Gas tight Connections

Ability to drill next hole section while maintaining stable wellbore. Ability to drill next hole section while maintaining stable wellbore. Consider formation strength using PPFG curve PPFG = Pore Pressure & Fracture Gradient

Casing Setting Depth Selection

Casing Setting Depth Selection

Class Problem 1.

Casing Setting Depth Selection

Strength Properties of Casing

Burst , Collapse Tensile Design

Burst , Collapse Tensile Design Burst

Burst , Collapse Tensile Design Collapse

Burst , Collapse Tensile Design

Burst , Collapse Tensile Design

Burst , Collapse Tensile Design

Class Problem 2. Calculate Collapse pressure for pipe : OD=7” Weight = 26 ppf Wall Thickness = 0.362” P-110

Burst , Collapse Tensile Design Axial Tension Faxial tension = σyield x As