GeoLock Retrievable Monobore Lock Mandrel

The GeoLock retrievable monobore lock mandrel allows well intervention in monobore and damaged nipple completions, as well as standard ones, and can be set anywhere in the tubing string. It is a surface-controlled tool with an adjustable diameter.

Reliable and retrievable tool

The GeoLock mandrel uses a unique “kinematic” nonrubber seal that is not affected by deformation when set. Together with the absence of any extrusion gap, this feature facilitates use in the presence of gas and at high temperatures and pressures for prolonged periods and allows the tool to be easily retrieved with a standard pulling tool on slickline. The anchoring and sealing devices maximize the mandrel’s internal flow area and reduce the mandrel OD when retracted during running in and pulling out of hole. 

Fully controlled setting

The GeoLock mandrel is deployed by means of the D-Set digital electrohydraulic setting tool, using an optimal setting sequence consisting of centralizing, anchoring, and sealing. The setting can be monitored fully from surface—a time plot of the complete sealing sequence is delivered. 

Deployment in small tubing or through restrictions

No shear pin is left in the well, as a calibrated shear disk is used instead, leaving a flush flow tube after setting. Consequently, the tool can be used in tubing as small as 2 7/8 in. Being fully reversible and having a high expansion ratio, the technology can be deployed even through restrictions like landing nipples.

Some common applications are

• shutting off perforations, using the tool as a thru-tubing slickline bridge plug
• leak testing tubing at different locations during the same run
• scraping tubing
• providing a nipple- and control line–free downhole safety valve
• replacing drillable bridge plugs
• deploying downhole gauges in monobore completions
• providing a pressure barrier for tree changeout for old wells
• production operations with a plug, straddle packer, screens, choke, etc.

There is a recommended option to run a scraping tool before running the GeoLock mandrel. In fact, the sealing blocks can be replaced by “pineapple sectors” for full circumferential scale scraping. By replacing the molded plastic seal parts with a soft metal like lead, copper, etc., tubing wall impressions can be taken.

Case Study