Pipe-in-Pipe flow has been used for many years in the solution mining business where water is circulated to dissolve large caverns within salt deposits for storing hydrocarbons. Oilfield Innovations have patented methods of using Pipe-in-Pipe flow during the production of hydrocarbons.
The left side example 8 5/8 x 7 5/8 inch outer tubing by 4 1/2 inch inner tubing completion illustrates how two (2) independent concentric flow streams can be controlled within a single 10 3/4 inch x 9 5/8 inch production casing.
After setting the production casing and drilling the reservoir section, the 8 5/8 inch by 7 5/8 inch outer tubing string with a 9 5/8 inch production packer is set within the production casing. The 8 5/8 inch x 7 5/8 inch tubing hanger is landed in a conventional manner (see below illustration).
A 4 1/2 inch production tubing string is run in to the hole with the a packer that can be set in the lower end liner. Conventional 4 1/2 inch production tubing jewellery is used and a sub-surface safety valve (SSSV) is run.
Oilfield Innovations' Multi-Injection-Production-Crossover (MPIX) is then run with a conventional 8 5/8 inch production packer, a conventional 4 1/2 inch nipple, a conventional 4 1/2 sliding valve and accompanying housing. The sliding valve can be a sliding side door or intelligent completion valve.
A second conventional 4 1/2 inch sub-surface safety valve (SSSV) is run with the 4 1/2 inch tubing hanger which is landed in a secondary flow spool for dry trees (see below illustration) or within the subsea horizontal tree. Subsea vertical tree configurations are also possible.
Conventional control lines, cables and chemical injection lines are run on the inner 4 1/2 inch tubing string. All cabling is clamped to the inner tubing string and encapsulated or shrink-wrapped to prevent fluid velocity erosion or vibration damage.
Many different conventional wellhead and trees can be modified to accommodate an additional flow spool (as shown above) or an additional production outlet regardless whether it is for a surface dry tree or a subsea wet tree. The technology exists. Oilfield Innovations' Multi-Injection-Production-Crossover (MPIX) has no moving parts and can be assembled with any vendors completion jewellery. When combined with proven multi-lateral technologies and proven extended reach drilling, 2-for-1 well costs are achievable.
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