During the development phase the gas company builds the infrastructure necessary for a fully producing gas field.

This includes using existing appraisal wells, drilling any additional production wells, building a production facility, and building flowlines and pipelines to transport the gas to market.

Sometimes the gas company can take advantage of existing infrastructure. For example, the Parmelia Pipeline was built in 1971, and all gas produced from Waitsia – Stage 1 travels to Perth via that pipeline.

This means Mitsui E&P Australia (MEPAU) only needs to build the pipes needed to connect new wells to the production facility.  The production facility also needs to connect to the Parmelia Pipeline. As part of the Waitsia Stage 1 expansion project, MEPAU will construct a new pipeline to the nearby Dampier Bunbury Natural Gas Pipeline.

Recent appraisal well examples include Waitsia-02, Waitsia-03, and Waitsia-04.

Waitsia Gas Project - Stage 2

Now that Waitsia Stage 1 is in full production we can focus on developing Stage 2. Find out about Waitsia Stage 2.

What we do at Mitsui E&P Australia

What we do

We are actively exploring, appraising, developing and producing oil and gas in a number of locations in the north Perth Basin. Read more about what we do


Before anything can happen we need to plan carefully. Read more about the planning process.


We look for gas, and when we find it we figure out if it’s worth pursuing further. Find out more about our exploration and appraisal process.


During the production phase we produce gas from the well and sell it. Find out more about the production process.

Decommissioning and Rehabilitation

When the exploration or production activity has finished it’s time to clean up. Read more about how we decommission and rehabilitate a well and its surrounding area.


The Northern Perth Basin

The Northern Perth Basin is a prolific oil and gas producing area covering a large portion of the Mid West region of Western Australia. The town of Dongara, located approximately 360km north of Perth, is the regional economic hub for a number of industries, including oil and gas.