With time, a concrete gravity platform structure will induce considerable deformation within the supporting soil. The casing, particularly the marine conductor, will have, at least in part, to follow the displacements that take place in the soil. The marine conductor and possibly the conductor casing therefore have to be designed such that the loads caused … Gravity structure
The purpose of the surface string is to provides blowout protection during drilling. Setting depth is often chosen to isolate troublesome formations, loss zones, shallow hydrocarbons, water sands, or protects the build-up section of deviated wells.
Deep-water wells present two problems for the casing designer, casing setting depth, and environmental loading above the seabed. Firstly, these environments have lower fracture gradients than equivalent depths for land wells, or offshore wells in shallow water. As the water depth increases, fracture gradients are significantly different, particularly in the shallow sections of the well. … Deep-water well
1. Hold safety meeting with crews before starting running the liner and report in iadc. 2. Make up plug dropping head on drifted single and lay in v door. Prepare 10m of chicksan lines. 3. Make up and bakerlock shoe track. Test floating equipment Make up torques: 4 1/2″ 15.1# p110 vam Min 6840 ft.lbs … 4 1/2″ liner running program example
The Production string is a string which is installed to separate productive zones from other reservoir formations or for testing purposes. The string through which the well will be completed, produced and controlled Used with or without a packer or flow tubing and inside which product flows. In most cases, the production casing will serve … Production string
Thread compounds are used for three distinct purposes: – to prevent corrosion of the connection parts during storage; – to facilitate the running of connections during make-up/break-out; – to seal the helical paths in the thread profile of tapered interference fit thread seals To serve the first purpose, storage compounds were developed. These compounds can … Connection Thread compounds
Threaded casing connections utilise three basic mechanisms to establish a leak tight joint. These mechanisms are: tapered interference fit thread seal; metal-to-metal seal; resilient seal. 1 Tapered interference-fit thread seal Tapered interference fit thread seals, such as the API round and API buttress threads, are not inherently leak tight, but have helical leak paths included … Connection sealing
Borehole pressure required to reach tensile failure depends on: tensile strength of the rock; state of stress in the formation; orientation of the wellbore with respect to the state of stress; shape of the wellbore cross-section; wellbore fluid penetration into the rock; chemical interaction between the wellbore fluids and the rock. 1. State of stress … Basic aspects of rock mechanics
The buckling theory showed that for buckling to occur, the reduced axial force, Fa*, must be negative. However, it is not necessarily the case that buckling will occur if the reduced axial force is less than zero. The capacity of the pipe to resist buckling will depend upon its dimensions, material properties, the well profile … Resistance to buckling
After the casing string has been designed to withstand the anticipated collapse and burst loads, it should be checked against the loads that will be experienced during the installation, and against the loads experienced during cementation and pressure testing. Such loads are calculated on the basis that the string is fixed (suspended) at surface but … Installation loads