A new online monitoring system for oilfield produced water

Abstract

The invention relates to a novel oil field produced water online monitoring system, which comprises online monitoring equipment with a non-explosionproof structure, wherein the monitoring equipment with the non-explosionproof structure is integrated highly to be arranged in a positive pressure explosionproof analytical cabin. In the online monitoring system, a sampling and pretreatment unit adopts three sampling points which are at an outlet of a setting tank, an outlet of a purification tank and an outlet of a clear water tank respectively; a water path switching and pneumatic control unit is realized by the programmable logic controller (PLC) programming control technology and the electromagnetic and pneumatic technology; data monitored by a monitoring analytical and data processing unit is collected by a PLC control cabinet and is connected with a station control upper computer, a station control server, a factory level information center and a digitalized command system platform of an oil field company sequentially by a recommendation standard 485 (RS485) bus signal; automation control is realized by the PLC programming technology; the self-cleaning and maintenance-free of a pipeline and measuring unit are realized by a double action mode of 'air purge and hydraulic pressure cleaning', so that water quality can be monitored continuously in real time and the running state of deoiling equipment or a filtering system can be monitored. The novel oil field produced water online monitoring system has the advantages that: the automaticity is high; the labor intensity of workers is relieved; the remote transmission of data is realized; and the like.

Description

technical field [0001] The invention relates to the field of oilfield production, in particular to an online water quality monitoring system in the process of oilfield produced water treatment process. Background technique [0002] At present, the current practice in my country's onshore oilfields is mainly to take manual on-site sampling and analyze the water quality through laboratory instruments. [0003] The artificial sampling test method has the disadvantages of low monitoring frequency, large error, poor timeliness, secondary pollution of water samples after monitoring, high labor intensity of workers, and inability to reflect water quality changes in a timely and complete manner. Supervision and control of effluent treatment facilities. [0004] The online monitoring of oilfield produced water quality is still in the exploratory stage in the world, and since the 1980s, it has experienced the gravimetric method and turbidimetric method based on the physical and chemi...

AI Technical Summary

Problems solved by technology

[0006] 1. Due to the lack of links in the design of the water treatment process and the poor treatment efficiency, the oil content and suspended solids in the oily sewage exceed the standard, the degree of salinity is high, and the corrosion is strong, which is easy to cause corrosion to monitoring equipment and system pipelines, etc. Blockage, over-range overflow problems;

[0007] 2. Oil and gas volatilization in oily sewage or monitoring equipment, control equipment (mostly non-explosion-proof electrical appliances) in the installation environment of the station (the overall environment is a Class II explosion-proof area);

[0008] 3. The problem of freezing and blocking of sampling pipelines and system equipment in northern regions in winter;

[0009] 4. Threats of thunderstorms in summer to lightning strikes, short circuits, and leakage of online monitoring equipment

[0010] Looking at the various online oil-in-water analyzers available at home and abroad, there is no product that is capable of automatic sampling, multi-channel water sample switching, necessary and appropriate pretreatment, self-cleaning maintenance of system pipelines and measurement units, pipelines, and equipment. Anti-corrosion, explosion-proof, anti-freezing, system integration and safety design can meet and meet the above requirements

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