Online measurement of dispersed oil phase in produced water

A system implemented on-site of a flowline transporting a fluid comprising an oil phase and a water phase, the system comprising:

• a fluid sampling system configured to fluidically couple to the flowline, the fluid sampling system configured to obtain a sample of the fluid flowed through the flowline, wherein the sample comprises the oil phase and the water phase;
• a sample cell fluidically coupled to the fluid sampling system, the sample cell configured to:
• receive the sample within an internal volume defined by the sample cell, and
• receive a chemical element within the internal volume defined by the sample cell, which, when mixed with the sample, is configured to separate the oil phase in the sample from the water phase in the sample;
• a measurement cell fluidically coupled to the sample cell, wherein the measurement cell is configured to:
• receive the separated oil phase and the chemical element from the sample cell, and
• remove the chemical element;
• and
• a capacitive measurement system connected to the measurement cell, the capacitive measurement system configured to implement a capacitive measurement technique to determine a quantity of oil in the separated oil phase in the measurement cell;
• and
• one or more flow control devices fluidically coupled to each of the fluid sampling system, the sample cell and the measurement cell, the one or more flow control devices configured to flow fluids through the system.

A system implemented on-site of a flowline transporting a fluid comprising an oil phase and a water phase, the system comprising:

• a fluid sampling system configured to fluidically couple to the flowline, the fluid sampling system configured to obtain a sample of the fluid flowed through the flowline, wherein the sample comprises the oil phase and the water phase;
• a sample cell fluidically coupled to the fluid sampling system, the sample cell configured to receive the sample and a chemical element configured to separate the oil phase and the water phase in the sample;
• a mixer positioned within the sample cell, the mixer configured to mix the sample and the chemical element causing the oil phase and the water phase to separate from each other, the chemical element remaining with the separated oil phase;
• a measurement cell fluidically connected to the sample cell, the measurement cell configured to receive the separated oil phase and the chemical element from the sample cell;
• a capacitive measurement system connected to the measurement cell, the capacitive measurement system configured to implement a capacitive measurement technique to determine a quantity of the oil phase in the separated oil phase received from the sample cell;
• and
• a control system comprising:
• a controller, and
• one or more flow control devices operatively coupled to the controller and fluidically coupled to each of the fluid sampling system, the sample cell and the measurement cell, the controller configured to control the one or more flow control devices to flow fluids through the system.