Holefinder success saves millions for operator in Azerbaijan

Holefinder Saves $4.0MM Per Well

An operator in Azerbaijan had been unable to complete wireline logging on multiple wells due to toolstring holdup on ledges at shale-sand interfaces.

Consequently the operator had been forced to acquire sub-surface data with LWD after drilling. Each post-drilling LWD pass took 6 days at a cost of $4.0MM per well. This method was used in place of wireline logging on 80% of the wells drilled.

Eager to reduce costs, the operator engaged Petromac to provide a holefinder system in order to navigate over ledges, washouts and borehole breakout.

The operator achieved a 100% success rate on the remaining well campaign, logging 5 wells with multiple toolstrings and avoiding the costly LWD passes.

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.

CHALLENGE

Ledges are the primary cause of toolstring holdup and 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

The operator was able to avoid the costly LWD passes and extra rig time by shifting the data acquisition program to wireline.

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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.