The previous article presented the methods to quantify the installation and as-landed loads. The purpose of this article is to present methods to quantify the changes in stress in the cemented casing due to departure from the as-cemented conditions caused by changes in pressure and temperature. The temperature related service loads and the estimation of … Service loads
This articel describes the various installation loads and how they are calculated. self-weight (in air) loads pressure (buoyancy) loads bending loads dynamic drag loads shock loads point loads static drag loads temperature loads Note: According to the principle of superposition, these loads can be added algebraically. 1. Self-weight (in air) The self weight (in air) … Installation loads
The burst and collapse loads are calculated by taking the difference (Pi-Pe) between the internal and external pressure profiles for each load case. If the resulting load line is mainly positive, it is called a burst load line (BLL); if it is mainly negative it is called a collapse load line (CLL). The net pressures … Pressure loads (burst and collapse)
1. Burst during drilling Burst loads can occur during the drilling phase due to displacement of the borehole to hydrocarbons. There are, however, a number of special cases to be considered. The base case and the special cases will be addressed in this section. 1.1 Internal pressure profile The worst-case internal pressure loading is that … Burst loads
The initial casing design, is not an exact reflection of the service loads, as it assumes that the casing string is not fixed at either end. It must be ensured that the incremental stresses resulting from changes in pressure, temperature, and applied point loads once the casing is cement do not cause it to fail. … Service loads
This article describes the mandrel casing hanger make-up and running proedures. Mandrel Casing Hanger Make-up The “total” hanger will consist of: bottom pupjoint MCH (Mandrel Casing Hanger) top pupjoint. The bottom pupjoint has to be made-up on the MCH by the bucking machine to the optimum torque. The top pupjoint should be made up to … Mandrel Casing Hangers
The hole conditioning guidelines described in this article should be adhered to in order to safely and successfully run the casing/ liner into the open hole. Structural Casing Driven or pre-installed: No hole conditioning necessary Conductor Casing Hole section drilled with seawater/high viscosity sweeps/native clay system with returns to sea bed At casing point circulate … Hole Conditioning before Running Casing or Liner
Colour Codes for New Casing/Liner All new casing shall be colour coded for yield as per API specifications 5CT. API Casing/Liner Grade Identification Colour Codes API Grade Markings On Pipe Body Markings on Coupling P-110 One white band White coupling L-80 N-80 One red band and one brown band One red band Red coupling with … Casing and Liner Colour Codes
Preparation for Running Casing and Liner: 1. ENSURE that all casing/liner and associated equipment is delivered to the well site allowing sufficient time for preparation prior to running. 2 ENSURE that when racking the casing/liner the pin and box ends are oriented correctly for running. Also check casing grade, weight and size. IF… mixed strings … Casing and Liner Running Preparation Guidelines.
This article describes the casing and liner handling guidelines. Safety Requirements ALWAYS wear gloves and eye protection when cleaning joints EXERCISE CAUTION when rolling casing/liner across racks to ensure feet and hand do not get trapped NEVER walk under loads suspended in the elevators or high line under crane NEVER get between loads and another … Casing and Liner Handling