Tool Taxis successfully convey a CAST-CBL to 82° deviation in 9-5/8” casing
An operator in Norway wanted to log CAST-CBL to the maximum deviation possible, on an upcoming campaign of 4 highly deviated extended reach wells.
Traditional methods of centralizing the CAST-CBL using slip-over centralizers causes excessive drag. This makes it challenging to descend past 50° deviation, which was not deep enough in the well for this operator.
The slip-over centralizers were replaced by Tool Taxis, and the toolstring was able to descend to a maximum of 82° deviation, which was sufficient to acquire the required data.
Equally as important, the eccentralization, ECC, was constantly below 0.1” in the deviated section of the borehole, which coupled with the smooth movement of the tool, resulted in excellent data.
Petromac wheels orient the probe to the high side resulting in higher pretest success rate and improved permeabilities.
CAST needs to be centralized within 0.1” in order to ensure quality data. This typically involves using strong slip-over centralizers, which limit the maximum deviation the tools can descend to under gravity alone.
The CAST was run on Tool Taxis, removing the need for the centralizers.
The toolstring was able to descend freely to 82°.
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).