Overview

The OneSubsea AquaWatcher water analysis sensor has the potential to revolutionize water management in multiphase and wet gas production. Using a unique patent-pending measurement-based analysis approach, the sensor enables chemical dosage based on a measurement of the ratio of chemicals to water downstream of the injection—down to part-per-million precision and in a fraction of a second.

As a result, operators achieve

  • significantly reduced risk and costs of chemical injection and reclamation
  • improved use of the available injection and reclamation capacity
  • ability to bring more production online faster.

Range of production insights

The AquaWatcher sensor can detect miniscule quantities of water in multiphase and wet gas flows and determine the salinity of that water. It can also determine the ratio of injected chemicals to water. The AquaWatcher sensor can measure the conductivity of produced water at any gas volume fraction (GVF) and most water cuts, including in the transition zone from oil to water continuous mixtures.

Breakthrough of injected water in waterflood applications can be detected at very low concentrations, and crucial information about the origin of produced water can be provided.

Flexible deployment options

The AquaWatcher sensor uses the reflection of a microwave signal to measure the permittivity and conductivity of the fluid mixture locally—for example, near the pipe wall in a process pipe. It can be installed anywhere in a subsea production system, including at the wellhead or in a subsea tree, either stand-alone or integrated with a multiphase or wet gas flowmeter.

Applications

  • Oil production: Determine the origin of the water (e.g., the formation, injected water, or a mixture of the two) and adjust water properties for multiphase metering applications
  • Wet gas production: Detect the onset of formation water production, measure the rate of formation water, and manage the injection of chemicals for flow assurance and other purposes

Advantages

  • Water detection at fractions down to a few parts per million
  • Measurement of water conductivity
  • Calculation of water salinity and ratio of injected chemicals to water
  • Direct sending of measurements to a subsea control system, a multiphase flowmeter, or any suitable communications unit
  • Process pressures up to 20,000 psi, temperatures up to 250 degF, and water depths to 10,000 ft