High quality X-Y density data in deviated wellbores in New Zealand

Petromac Wireline Express enables cross density measurement – in 8.5″ wellbores


9 Tool Taxis provided an optimum positioning of all sensors of the Quad-Combo/Dual-Density toolstring. They also reduced the drag to a minimum and oriented the bottom Guide upwards in order to navigate to TD past the multiple borehole breakouts.

A modified flex-joint connected the two Density tools, with the measuring skids aligned perpendicular to each other. The lower Y-Density tool was oriented to record density on the low side of the wellbore. Petromac Centering Taxis perfectly centralized the upper X-Density tool in the borehole so that the density skid made perfect contact with the wellbore wall when it was opened.


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CHALLENGE

Acquire a valid Density dataset in a deviated wellbore, with stress induced borehole breakouts.


SOLUTION

X-Y Cross Density by using two orthogonal density skids is the traditional solution. However, in deviated wellbores, the density pads make oblique contact with wellbore curvature resulting in invalid data. Tool Taxis were used to orient and centralize the density skids, to ensure that the skid is aligned with the wellbore curvature for perfect pad contact.


RESULTS

World’s first high-quality density dataset recorded from the side of the wellbore in a highly deviated well. Comparison between vertical and horizontal density measurements showed a perfect match.


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.

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Without a holefinder, wireline toolstrings are easily held up by ledges and washouts.

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Using the Wireline Express holefinder, the toolstring does not loose any momentum as it slides over wellbore obstructions.

CHALLENGE

In ‘vertical’ wellbores large ledges will persistently holdup toolstrings, even on TLC operations.

SOLUTION

Petromac Tool Taxis ensure that the angled holefinder is always oriented upwards, allowing the toolstring to slide seamlessly over ledges.

RESULTS

A well which could not be logged on TLC was subsequently logged using the Petromac holefinder system (6 successful runs in hole).


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