Time-lapse PTA, integrated where it's used

Over the past two decades, continuous downhole pressure measurements from PDGs and ESP intake sensors have enabled PTA to expand from specialist reservoir studies on exploration and appraisal wells into a routine surveillance workflow across development wells. However, reliable time-lapse PTA depends on quality-assured production rates and validated PVT models, and those critical inputs are derived, reconciled, and governed in the production engineering ecosystem. Built on an open REST API architecture, Andromeda brings PTA directly into that environment, closing the loop within the same operational layer by drawing on those inputs to deliver reliable outputs for reservoir surveillance and production optimisation.

However, reliable time-lapse PTA depends on quality-assured production rates and validated PVT models, and those critical inputs are derived, reconciled, and governed in the production engineering ecosystem. Built on an open REST API
architecture, Andromeda brings PTA directly into that environment, closing the loop within the same operational layer by drawing on those inputs to deliver reliable outputs for reservoir surveillance and production optimisation.

Time-lapse PTA

Every shut-in becomes a data point

Andromeda turns routine and opportunistic shut-ins into structured PTA analyses. Reservoir pressure, flow capacity, skin, and the position of mobility fronts are tracked through time, giving engineers a moving picture of how the well and reservoir are changing.

Andromeda turns routine and
opportunistic shut-ins into structured PTA analyses. Reservoir pressure, flow capacity, skin, and the position of mobility fronts are tracked through time, giving engineers a moving picture of how the well and reservoir are changing.

Direct PI historian connection: Pressure and rate data are live-streamed directly into Andromeda, allowing frequent water-wash events to be monitored as part of routine halite surveillance and water-wash optimisation.

Higher PTA utilisation

Every shut-in becomes a usable surveillance opportunity.

Engineering consistency

Each analysis uses the rates, PVT, and well models engineers already trust.

No duplication

No parallel data and analysis layer for engineers and IT to maintain.

Outputs in use

PTA outputs support production optimisation within the same ecosystem.

CASE STUDY · ANDROMEDA IN A PETEX DOF ENVIRONMENT

The intervention that wasn't needed

A well showed declining productivity. The operational question was whether this was formation damage, which would point to an intervention, or a near-wellbore PVT effect which would point to a change in production strategy.

Time-lapse PTA was run automatically across multiple build-ups in a Petex DOF environment. The early-time pressure derivative indicated a near-wellbore gas-blocking effect in a volatile oil well.

The productivity change was therefore explained by changing near-wellbore effective permeability, not formation damage. No intervention was required; the response was choke management.

Time-lapse PTA was run automatically across multiple build-ups in a Petex DOF environment. The early-time pressure derivative indicated a
near-wellbore gas-blocking effect in a volatile oil well.

The productivity change was therefore explained by changing near-wellbore effective permeability, not formation damage. No intervention was required; the response was choke management.

PTA in the DOF workflow environment: The Andromeda PTA workflow sits alongside IFM workflows for pressure handling, rate allocation & virtual metering, PVT, well-model updates, and surveillance.

Automated shut-in detection: Pressure and rate histories are processed automatically; valid build-ups are identified, synchronised with rates, and prepared for time-lapse PTA.

Time-lapse PTA diagnosis: Multiple build-ups showed changes in the early-time derivative consistent with near-wellbore gas blocking, not formation damage.

Results returned to IVM: PTA outputs are available alongside wider production data, so the diagnosis can feed back into surveillance and operating decisions.

Bring PTA into your production engineering environment

Talk to us about a pilot, or see Andromeda with your data