Computerized control system for a desalination plant

A desalination plant for producing a low salinity injection water of desired composition for an oil reservoir, comprising:

• a water inlet line;
• at least one bypass line coupled to a respective bypass line valve;
• at least one reverse osmosis (RO) feed line coupled to a respective RO feed line valve;
• at least one nanofiltration (NF) feed line coupled to a respective NF feed line valve;
• at least one RO concentrate line coupled to a respective RO concentrate line valve;
• one or more RO arrays in fluid communication with the water inlet line, wherein each of the one or more RO arrays is configured to receive an RO feed water and produce an RO permeate and an RO concentrate;
• one or more NF arrays in fluid communication with the water inlet line, the one or more RO arrays, or both, wherein the NF array is configured to produce a NF permeate and an NF concentrate;
• a blending system, wherein the blending system comprises:
• at least one RO permeate line,
• at least one NF permeate line,
• a blending point communicating with the at least one RO permeate line, the at least one NF permeate line, a combined RO/NF permeate line, a produced water (PW) blending line coupled to a PW blending line valve, and a low salinity injection water line configured to blend RO permeate from the at least one RO permeate line and NF permeate from the at least one NF permeate line to form a blended low salinity injection water in the low salinity injection water line,
• an injection pump, and
• a discharge line configured to deliver the blended low salinity injection water to an injection system;
• a control system integrated with the desalination plant and configured to control operation of the one or more RO arrays, the one or more NF arrays, the blending system, or a combination thereof within the desalination plant, wherein the control system comprises:
• a control panel (CP);
• a plurality of regulatory controllers (RCs);
• and
• a supervisory controller (SC), wherein the SC is in signal communication with the CP, and with each of the plurality of RCs, wherein the SC is configured to:
• receive user inputs from the CP, and receive inputs from the plurality of RCs regarding data from a plurality of sensors within the desalination plant,
• the plurality of sensors, wherein each of the plurality of RCs is in signal communication with the plurality of sensors, wherein the plurality of RCs is configured to:
• receive data from the plurality of sensors, provide outputs to and receive permissions from the SC, and instruct a plurality of devices of the desalination plant in response to the received permissions from the SC, wherein the plurality of sensors comprises sensors configured to measure flow rate, pressure, or both of:
• the RO permeate, the NF permeate, the blended low salinity injection water, a feed water bypass stream, a PW blending stream, and an ion concentrate stream;
• wherein the SC is configured to:
• monitor trends in the inputs regarding and/or predict outcomes from data received from the plurality of RCs and determine the permissions for each of the RCs based on the monitored trends, user inputs from the CP, or a combination thereof, and
• the plurality of devices;
• the one or more RO arrays;
• the one or more NF arrays;
• and
• the blending system, wherein the plurality of devices comprises a plurality of valves and pumps, and
• wherein the control system is configured to receive signals from the sensors on the at least one RO feed line, the at least one NF feed line, the RO permeate line, the combined RO permeate line, and the bypass line to control valves on the at least one RO feed line, the at least one NF feed line, the bypass line and the PW blending line to produce an injection water having a composition within an operating envelope via an injection line.