In General, The API Casing design safety factors range from 1.1 to 1.6. This article will discuss their values considerations for Collapse, tension, Burst, triaxial, and compression. This article is a part of Our Casing Design Guide For drilling Engineers. Exact loading values are challenging to predict throughout the life of the well. For example, …
We can define Biaxial Casing as the combination of stresses due to the weight of the casing and external pressures which is also referred to as ‘biaxial stresses’. Biaxial stresses can reduce collapse resistance of the casing and must be accounted for in designing deep wells. This article is a part of Our Casing Design Manual. …
Casing Tensile Strength The tensile load of the pipe is the weight of the casing which acts to pull the pipe apart. The tension is always the greatest at the surface and decreases with depth due to the casing weight below the point of interest. In designing a casing string the upper most joint of …
The primary collapse loads are supplied by the pressure of the fluid column on the outside of the casing, which acts to collapse the pipe and may cause collapsed casing sticking problems. These fluids are usually the mud and possibly the cement slurry in which the casing pipe was set. Since the mud column increases …
This article is one of 22 articles explaining the casing design calculations in detail. Casing Burst Pressure Calculation is a significant aspect in casing design calculations as the burst loads on the casing must be evaluated to ensure the internal yield resistance of the pipe is not exceeded. The burst load is the force applied …
The presence of CO2 and H2S accompanied by water can cause corrosion of the exposed tubular. In addition, H2S can cause Stress corrosion cracking & Sulfide Stress cracking in the casing. Stress Corrosion Cracking Mitigation In Casing When CO2 or H2S are dissolved in water, they will create an acidic solution. These solutions react with …
Casing Thread Connections Oilfield tubulars may have plain ends (no threads), API-specified threaded casing thread connections, or proprietary (non-API) threaded connections. API Casing Connections Oilfield casing conforming to API standards may be obtained with plain ends but ends are usually threaded and furnished with couplings such as: Except for Extreme-Line, male (or pin) threads are …
Casing pipes are robust and durable tubes made from different materials, such as steel or PVC, designed to provide structural support and protection to the wellbore or borehole. They are inserted into the drilled hole and cemented in place, forming a protective barrier that prevents the collapse of the well walls and the contamination of …
In order to understand the strengths of casing tubular material, it is important to understand the basic terminology and process of manufacture such materials to be able of accomplishing a successful casing design. Yield Strength In Casing Material The strength is the material property of steel which is usually indicated by its minimum yield strength or …
Introduction To Steel Casing Design Calculations From the earliest days of wells dug in the ground for various purposes, the need for some means of supporting the walls of the hole has been recognized. Many oil and gas wells of ancient times were lined or “cased” with rock. Over the years, the technology of casing …