Case Study

Innovation enables non-invasive subsea flow measurement for model validation or calibration

Industry

Oil and Gas

Year

2021

Region

Asia Pacific
Overview

Based on a unique customer requirement, Oceaneering developed an ROV-installable subsea ultrasonic flowmeter used to determine gas injection flow rate to an individual well offshore Australia.

This tool was designed to optimize injection of a sealant into the wellbore by measuring flow rate in a 3-inch gas lift jumper coated in three-layer polypropylene (3LPP).

Issues

The customer had attempted to rectify a leak using a sealant.

Because they were unable to measure the gas injection to the well properly, the customer was unsuccessful in their efforts to repair the leak. The gas flow rate appeared to be "too high." Oceaneering’s innovative solution provided the customer with an alternative to the only other solution—a costly rig-based workover.

Subsea-Ultrasonic-Flowmeter.6-1-landscape
Our Solution

We needed to successfully marinize an ROV-installable ultrasonic flowmeter.

For this to be possible, the flowmeter had to be fitted with a safe and reliable attachment mechanism. The mechanism was designed as a "push on" clamp so that in the event of a vessel runoff, the clamp would pull off without damaging either the pipeline or the clamp. An Oceaneering team based at the Jandakot, Australia, site worked with a team of local experts to create the solution.

Execution Plan

Early engagement with the customer in January 2020 provided the development team with time to work with the distributor and original equipment manufacturer (OEM).

After assessing the technical risk of the project and developing a solid project concept, Oceaneering was awarded a contract to develop the new marinized flowmeter. The time from awarding of the purchase order to mobilization was eight weeks.

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Results

The flowmeter allowed the customer to inject proper amount of sealant.

Ultrasonic-Gas-Flowmeter-real-landscape

The flowmeter identified that the choke indicator was incorrect. When the flowmeter was installed, and the choke “closed,” it was found it needed to be closed in two positions for flow to go to zero. The customer was then able to inject the correct rate of sealant based on gas flowrate.

This was the first time an ultrasonic flowmeter was installed and used by an ROV to measure gas or liquid subsea. Customers are now able to non-invasively verify choke positions, calibrate permanently installed flow meters, and validate flow assurance models by measuring gas or liquid flow on existing infrastructure.

With this ROV-deployable solution, Oceaneering can potentially help customers prevent a costly rig workover.

Project Highlights

  • Ability to correctly dose subsea chemicals, reducing waste and improve chemical efficiency
  • Ability to calibrate the choke, delivering significant cost savings

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