Another key feature of these systems is the use of the Sperry-Sun latch coupling as the primary index. This allows precise depth control and azimuthal orientation to ensure guaranteed repeatable re-entry of the lateral. The lateral liner is mechanically hung off the mainbore window, which allows full-gauge access to the lower mainbore. RMLS Retrievable Multilateral System Multilateral junction construction system that uses a pre-milled window for drilling new multilateral wells. The lateral liner can be cemented and washed over to allow full-gauge access to the lateral or lower mainbore.
Hydraulic integrity is supplied using cement.
ITBS Isolated Tie-Back System Multilateral junction construction system that has full mechanical and hydraulic integrity across the junction using a flexible hanger. Selective re-entry to either the lower mainbore or lateral can be done with coiled tubing or wireline. The inflatable window provides full mechanical and hydraulic integrity across the junction. These systems may or may not utilize the Sperry-Sun latch coupling. Developed in conjunction with Weatherford.