Introduction To Oil Well Casing Drill Bit Sizes Selection The design of the casing Drill Bit sizes used in drilling oil / oilfield onshore and offshore wells using selection charts is performed from the bottom to the top, starting with the production tubing. But before proceeding in this article, you may be interested on our …
The selection of the number of casing strings and their respective setting depths or seat generally is based on a consideration of the pore pressure and fracture pressure gradients of the formations to be penetrated. This article is a part of our Casing Design Full Guide. Casing Seat Depth Selection Procedure First: Calculate Pore Pressure …
In General, there are six casing types used in drilling Casing Design in all onshore and offshore wells, which are as follows: Types Of Casing Used In Drilling Wells Structural Casing or Drive Pipe This casing string provides initial hole support close to the surface and generally varies in length from about 30 to 300 …
Casing must have certain properties in order to achieve its functions in a well. The most important performance properties of casing include its rated values for axial tension, burst pressure, and collapse pressure. Axial tension loading Which results from the weight of the casing string suspended below the joint of interest.Read More Body yield strength …
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 …