Tool Taxis successfully convey a IBC-CBL to 85° deviation in 9-5/8” casing
Operators in the Middle East routinely require cement evaluation in very highly deviated wellbores. IBC-CBL in extended reach wells can quickly become very expensive due to difficulties in logging tool conveyance.
Traditional methods of centralizing the IBC-CBL using slip-over centralizers causes excessive drag. This makes it challenging to descend past 60° deviation via gravity. Operators had to resort to pipe or tractor conveyed logging for higher deviations. Pipe conveyed logging is operationally complex, time consuming and risky, whereas tractor conveyance can sometimes be limited by force output in long laterals.
To overcome this, the slip-over centralizers were replaced by Centralizing Tool Taxis, and tool strings now routinely descend on gravity to >80° deviation.
Track record includes horizontal logging of IBC-CBL over 20000ft, with an ECCE below 0.2”.
Using strong slip-over centralizers for Cement Evaluation tools limits the maximum deviation the tools can descend to under gravity.
The IBC-CBL was run on centralizing Tool Taxis, removing the need for the centralizers.
Tool strings able to descend freely to 85° and assist tractors in horizontals of over 15000ft.
Holefinder system facilitates wireline logging in an ‘impossible well’ in Iraq
Near Vertical ‘Impossible Well’ Logged in Iraq
An operator in Iraq was combating major issues with wellbore ledges in a well with only 6 deg deviation. After two wireline runs which were held up at shallow depth, the operator undertook a wiper trip, only to experience similar problems again on the 3rd attempt. The decision was made to run a TLC operation, however this was also unsuccessful.
In all a total of 5 days of rig time had been lost trying to pass a 20” washout with associated ledge.
Frustrated with the lack of results from conventional wireline and TLC, the operator sought the expertise of Petromac to log this critical well. A total of 6 descents were made with Petromac Wireline Express – all seamlessly conveyed to TD.
Without a holefinder, wireline toolstrings are easily held up by ledges and washouts.
Using the Wireline Express holefinder, the toolstring does not loose any momentum as it slides over wellbore obstructions.
In ‘vertical’ wellbores large ledges will persistently holdup toolstrings, even on TLC operations.
Petromac Tool Taxis ensure that the angled holefinder is always oriented upwards, allowing the toolstring to slide seamlessly over ledges.
A well which could not be logged on TLC was subsequently logged using the Petromac holefinder system (6 successful runs in hole).