No abstract

Claims can be found in technical literature for using Mono Diameter Expandable Liners in deepwater applications. In a technical review of the existing Mono Diameter Expandable Liner systems by various vendors, it is concluded that Mono Diameter Expandable Liner can be considered for using as a drilling liner if certain prerequisites as discussed in this paper are met. Further, the product can be used in a brown field development scenario, where no pore pressure surprises are expected. In any case, once drilling to target has been achieved, the product must be covered by a conventional casing. Proper risk evaluation before running in the hole is recommended, given the high per day costs associated with the deepwater wells. On the other hand, if the product has to be used for deepwater pre planning and casing design purposes, substantial increase in strength (collapse & burst of the pipe) will be required, without which the product will not qualify industry standard casing design criteria’s at the basis of design level. From design perspective, one time or multiple mono diameter expandable liner extension are the same and the key issue to address in using this product is meeting the collapse pressure requirements.

The first cuttings re-injection operation in a subsea annulus is presented. A discussion of some important formation fracturing aspects is presented. The necessary equipment is described. This includes a description of the modified well head design for cuttings re-injection and description of a flexible hose transporting the re-injection slurry from the platform to the well head. A short description of the cuttings re-injection operation is given where cuttings were re-injected into the same well as being drilled. P. 207