Tool Taxis perfectly centralize an Array Sonic toolstring in 8.5” wellbore
In a world first, an operator in the United Arab Emirates ran a Array Sonic centralized on Petromac Tool Taxis. This eliminated the drag inherent to traditional methods, resulting in excellent data quality.
Further to this, the Tool Taxis provide 2.4” of standoff (in 8.5” hole) on the sonde which perfectly centralizes the tool in the wellbore. Powered Calipers (which are placed at the extremity of the Array Sonic) and bowspring centralizers(which collapse under load) are not able to provide the same quality of centralization.
Further details of this technique can be found in SPE paper SPE-192876-MS.
Centralizing Tool Taxis provide 2.4” of standoff, which keep the Array Sonic within .1” of the center of the wellbore in 8.5” hole.
Array Sonic tool with high-drag traditional centralizing equipment (left) and with low-drag Petromac equipment (right)
Centralizing Array Sonic tools typically involves adding drag inducing centralizers (powered calipers / bowsprings) which limit the maximum deviation the tools can descend to under gravity alone.
Petromac Tool Taxis were used to centralize the Sonic tool, reducing the drag.
The Array Sonic was perfectly centralized in the 8.5” wellbore and drag was significantly reduced.
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).