Hermes Drag Planner convinces client to run MDT in Nigeria

Drag planning software accurately predicts downhole forces, resulting in high level of confidence and successful jobs.

Petromac’s Hermes© Drag Planner calculates the downhole Tool Drag of any toolstring, and when coupled with the well survey and other downhole conditions, can accurately predict to what depth it can descend to on wireline.

Actual Tool Drag from the job is fed back into the Planner in order to refine it for future operations.

On this particular job, the MDT was run on ultra-low friction TTB type Taxis and Hermes© predicted a Tool Drag of 0.06, and a healthy head tension of 700lbs whilst descending in the 70º deviated section as shown below:

Actual job data, shows that the downhole Head Tension (HTEN) accurately matched the Predicted HTEN as shown on the right (Track 1).

In addition, the measured Tool Drag average was 0.06 as shown on the left, which matched perfectly with the Tool Drag predicted by Hermes©.

CHALLENGE

Operator in Nigeria had very low confidence of running MDT to 70º deviation and avoiding getting differentially stuck, due to past failed attempts.

SOLUTION

Petromac Hermes© Drag Planner was used to convince the client that the MDT would be successfully deployed on wireline by gravity alone.

RESULTS

The tool descended freely to TD by gravity without any indications of sticking.

In addition, the Tool Drag and Head Tension matched perfectly with the outputs from Hermes© Drag Planner.

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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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