A major international Oil & Gas service company requested a DSI PBL bypass tool for a special application in an offshore exploration well in Mexico. For a 26” drill bit size, a special BHA was designed in order to control any possible total mud loss and at the same time have the ability to take gyro surveys and ensure accurate directional drilling paths avoiding any collision with the surface casing of an adjacent well
The first challenge for this application was to place a UBHO sub with a 2.625” I.D. above the standard 9-1/2” PBL bypass tool, allowing the 2-1/2” PBL activation ball passing through the UBHO sub which has a 2” ID, therefore using this configuration was not possible.
A 9-1/2” High Flow PBL bypass tool with a special drift of 2.65” minimum ID was selected for this application allowing the 2-1/2” gyro bar to pass through the PBL bypass tool. The pass through / drift test was performed at DSI facilities to ensure the gyro could freely pass through the HF PBL bypass tool. The operator’s plan was to take several gyro surveys at the lowest possible point inside the BHA. In case of total mud loss it would be possible to displace the LCM pill through the PBL bypass tool saving a round trip to replace the BHA and reducing cost due to mud loss.
The operator drilled from 306m to 1,076m, and took 10 gyro surveys from 318m to 579m using a gyro probe, every survey was confirmed three times. No restriction or drag was observed while passing the gyro probe through the High Flow PBL bypass tool and this was confirmed by the gyro operators.
As no mud loss was observed, the PBL bypass tool was not activated, however, the ability to activate the PBL bypass tool was preserved in case of operational need.
In case of the need to activate the HF PBL bypass tool it would not be possible to take additional surveys so, to overcome this issue, DSI proposed an improved solution for the upcoming jobs, which is the use of the PBL SLIDING SLEEVE BIG BORE SYSTEM (SSBB).
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