Process and system for extraction of aqueous fluids in petroleum produced with low water concentration for its characterization

A process for extracting aqueous fluids from petroleum produced with a low concentration of water for its characterization, comprising the steps of:

• (a) obtaining oil samples with emulsified water where the water content is less than 1%, in volumes ranging from 15-18 liters of oil sample using oil containers;
• (b) heating the oil containers containing the samples to a temperature ranging from 40° C.-60° C.;
• (c) adding to the heated oil a graphitized copolymer type demulsifier;
• (d) stirring the oil container manually or mechanically until achieving homogenization of the sample with the demulsifier;
• (e) keeping the oil container at rest for 12-24 hours;
• (f) preheating the contents of the oil container and pouring it into an insulated reservoir, wherein the temperature is measured by the transmitter, adjusted, and then controlled by the controller, which activates an electrical resistance;
• (g) releasing the flow, through the blocking valve, after stabilizing the temperature at values between 45° C. and 60° C.;
• (h) regulating the oil flow rate to a self-desludging stacked plate centrifuge by operating the control valve, wherein inside a centrifuge rotor, water and oil separate due to the centrifugal force, with water concentrating on the rotor periphery;
• (i) recirculating the separated oil, through the action of the centrifugal field, to the reservoir;
• (j) after recirculating the inventory at least twice, withdrawing an oil sample through the sampling point, measuring the residual water concentration in this sample, and comparing it with the water concentration measured in the original sample;
• (1) repeating the procedure from steps (h)-(j), after one or two more successive recirculations of the inventory;
• (m) once the separation is complete, connecting the separation system to a capillary tube introduced into the centrifuge rotor in the water accumulation region;
• (n) subsequently, aspirating a water sample using a vacuum pump and accumulating it in the oil container;
• (o) once the water sample has been withdrawn, proceeding with the desludging of the self-desludging stacked plate centrifuge by injecting water into a specific connection and using it to remove residues from the centrifuge rotor of the self-desludging stacked plate centrifuge and, afterward, draining the oil reservoir;
• and
• (p) after the desludging step, cleaning the centrifuge with water-free mineral oil added through a cleaning fluid inlet and the reservoir.