Casing Archives - Page 4 of 9

The load determination for a stove pipe, foundation pile or marine conductor is a complex issue. This determination is usually followed by specialised stress analysis resulting in the involvement of a Structural Engineering department. The load determination and related stress analysis for a conductor casing is less complex, but still requires a good knowledge of … Stove pipe, foundation pile, marine conductor and conductor string

1 Evacuation during drilling Collapse loads occurring during drilling are usually the result of borehole evacuation due to natural or induced losses. There are however other cases to be considered. 1.1. Internal pressure profile In a losses situation, the mud column will drop until the pore pressure at section TD is just balanced by the … Collapse loads

A liner (other than slotted liners) is a string of casing which does not extend all the way to the surface. Liners are installed to permit deeper drilling, to separate the productive zones from the other reservoir formations or for testing purposes. Usually cemented up to the top of the liner. Usually cemented over its … Liner

This article addresses the possible loads on a connection and its sealing and structural capacity. It should be highlighted that these capacities do not always produce the same value. 1 Imposed loads In general a connection is subjected to two types of load: Make-up load: Making up the parts will impose stresses in the connection. … Reliability and structural integrity of connections

Casing failure can have various causes. Casing may fail after exceeding, even once, the ultimate tensile or compressive strength, but also after repeated load cycles below the ultimate tensile or compressive strength. This phenomenon is known as fatigue, and practically all materials are subject to it. 1 Introduction The effects of surface condition, corrosion, temperature, … Influence of fatigue on casing strength

The purpose of Stove pipe, marine conductor or foundation pile is to: – protect the incompetent surface soils from erosion by the drilling fluid. – reduce the wave and current loads imposed on the inner strings. – may be used to install a full mud circulation system. – guide the drillstring and subsequent casing into … Stove pipe, marine conductor or foundation pile

This article describes the recommended guidelines for casing storage, handling and transport that need to be taken account in the design phase of the casing. 1 Storage The design of pipe racks is dependent on local conditions. i.e.: required load bearing capacity and degree of permanency. Racks can be made with pipe supports (stringers) set … Casing Storage, Handling and Transport

The intermediate string is a string which is used to isolate weak formations, to case off loss zones, sloughing, caving and reservoir formations. Such strings are also set in transition zones to abnormal formation pressure to provide blowout protection by upgrading the strength of the well. Cement fill is required to shut off hydrocarbon zones … Intermediate string

Due to potential frequent changes to casing specification, casing make-up torque and drift dimensions shall be as per the manufacturer’s recommendations. Buttress Thread Casing Connections 9.5/8 – 13.3/8 OD Casing (BTC) Make-up torque valves of buttress thread casing connections sizes 9.5/8in to 13.3/8in OD shall be determined by carefully noting the torque required to make … Casing Make-Up Torque

Casing setting depths found in Drilling Programmes fall into two categories: 1. Those where the casing is set at a specific marker (ie., formation above reservoir). 2. Those where the casing is set at a convenient point in the total well path. The casing setting depths in 1. are absolute and the hole shall be … Casing Setting Depths