1 -

Place ICC in casing below proposed lateral depth and cement casing. The ICC is not oriented in advance. Cement casing.
2 - Drill out cement. A proprietary coating prevents cement from sticking to an ICC profile. Wiper plugs typically clean the ICC, but a jetting tool is available to clean ICC profiles. Determine ICC orientation with USI UltraSonic Imager log measurements acquired during a USI and CBT Cement Bond Tool evaluation.
3 - Attach retrievable whipstock and selective landing tool to milling assembly. Lock selective landing tool with orienting key adjusted to properly position tools in ICC profile. Shear off of whipstock and mill window through casing. Remove milling assembly and retrieve whipstock.
4 - Clean out main wellbore.Set reentry deployment tool (RDT) and selective landing tool in ICC to divert drilling assemblies and logging tools through casing window. Drill lateral borehole.
5 - Install liner on drillpipe guided by RDT for borehole stability and zonal isolation. Pump cement through drillpipe and liner into liner-borehole annulus to a point below the polished-bore receptacle (PBR) on top of the liner. Release drillpipe from liner and retrieve running tool before cement hardens.
6 - Run overshot to latch onto RDT and selective landing tool. Retrieve RDT and selective landing tool.

Milling Casing Windows
The RapidAccess system uses an indexing casing coupling (ICC) installed in the primary casing to mill exit windows for openhole laterals. The fullbore ICC serves as a permanent depth and directional orientation reference for drilling or reentry operations, allows conventional cementing operations and provides a platform for constructing RapidConnect and RapidExclude junctions.

A two-stage process using a whipstock followed by a special reentry deployment tool (RDT) improves window milling and junction construction compared with systems that just use a whipstock. The RDT outside diameter is smaller and easier to retrieve than standard equipment, which minimizes debris and tool-retrieval problems after drilling. Redundant tool-retrieval features further ensure access to lower laterals.

Wireline or measurements-while-drilling (MWD) tools determine ICC depth and directional orientation so a selective landing tool can orient the whipstock and milling assembly in a specific direction. The ICC position also can be determined from USI UltraSonic Imager log data acquired during CBT Cement Bond Tool evaluations, eliminating one logging run.