Borehole dilution tests to measure leachate flow at a recirculation landfill

The recirculation and infiltration of leachate in landfills may be carried out to facilitate the flushing of contaminants and accelerate the stabilisation of waste. Flushing contaminants through recirculation relies on the movement of fluids through the landfill body to basal drains, which will predominantly be driven by gravity. Leachate...

Automated Classification of Well Test Responses in Naturally Fractured Reservoirs Using Unsupervised Machine Learning

Understanding the impact of fractures on fluid flow is fundamental for developing geoenergy reservoirs. Pressure transient analysis could play a key role for fracture characterization purposes if better links can be established between the pressure derivative responses (p′) and the fracture properties. However, pressure transient analysis is...

Using DPS Measurements for PTA with System Identification

Pressure measurements obtained with distributed pressure sensing (DPS) could be used to estimate circumferentially averaged reservoir parameters with pressure transient analysis (PTA). System identification (SI) for PTA allows us to estimate parameters such as permeability with dynamic bottom hole pressure and flow rates measurements, with the...

Multiphase transient analysis for monitoring of CO₂ flooding

The potential of well test technology is discussed in this paper to estimate the miscible condition and displacement fronts position during CO₂ flooding. To interpret the multiphase well test curve of CO₂ flooding process, an accurate compositional numerical model is developed in this study. The model includes fully EoS...

Development of a Performance Envelope for Well Production Analysis; towards automated identification of problematic wells

Producing an oil well is a transient process, and although we like to assume there is a steady state phase in the production life, it is a fragile situation. Due to the many unknowns in the reservoir, changes in well production performance cannot easily be predicted. Changes in the subsurface will influence the production and lifetime of the...

Underground Reservoir Identification Using Generalized Wellbore Data

We present a novel method for estimating physical properties of an underground hydrocarbon reservoir, on the basis of generally measured wellbore ow rate and pressure signals at the bottom of a producing well. The method uses instrumental variable-based system identification techniques to solve for a closed-loop errors-in-variables problem....

Well testing in the framework of system identification

Well testing has been subject of research for many decades. Well testing is performed to estimate reservoir properties. These estimations are needed to predict the amount of oil that can be produced, and to determine a strategy how to produce this predicted amount. The currently used procedure to estimate the properties seems cumbersome and...