NGI Logged over 2400m section at 67° deviation in New Zealand

Tool Taxis Enable NGI Log in High Angle Tangent Section

An operator in New Zealand drilled a challenging sidetrack well featuring a 2400m, 67deg tangent section. Equipment failures in the BHA resulted in a corkscrew hole in the lower half of the well.

It was critical that the operator logged the NGI in this well as the field contains complex geological structures.

Petromac provided a custom-made Tool Taxi which centered the NGI within 0.3in of the center of the wellbore. In this configuration the NGI can be run without standoffs, which induce drag and cause stick slip motion.

CHALLENGE

High deviation combined with poor hole conditions threatened to prevent the acquisition of critical NGI data.

SOLUTION

Petromac Tool Taxis were used to convey the NGI seamlessly to TD.

RESULTS

The tool descended freely to TD without holdup and recorded high quality image logs.

The logs were also devoid of any stick slip artifacts due to the smooth tool motion enabled by the Tool taxis.

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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.

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

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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