Oil field two-stage dehydration system and method

Abstract

The invention provides an oil field two-stage dehydration treatment system and method. The system comprises a control cabinet and a two-stage dehydration device, the two-stage dehydration device comprises a temperature sensor, a liquid level meter, a pressure sensor and an electric control part, wherein the temperature sensor, the liquid level meter, the pressure sensor and the electric control part are all electrically connected with the control cabinet, and the control cabinet is used for giving an alarm according to temperature, pressure and liquid level signals and controlling starting andstopping of the electric control part. The pressure transmitter and the temperature transmitter are arranged on the ball receiving barrel, so that the safety of a station yard and equipment are protected; a liquid level meter is added to the dosing device, and dosing time is mastered at any time; the first heating furnace is provided with a full-automatic combustor, so that remote automatic ignition and flameout protection are achieved, and the production operation safety of station personnel is improved; an associated gas outlet pressure remote transmission function is added to the buffer tank, and pressure remote transmission, over-limit alarm pump stopping, remote switching of the two pumps and emergency shutdown functions are added to the output pump, so that the number of times of on-site manual operation is reduced; meanwhile, a double-proportion drain valve is additionally arranged at the outlet of the associated gas separator to realize automatic drainage.

Description

technical field [0001] The invention belongs to the technical field of crude oil dehydration, and in particular relates to an oilfield two-stage dehydration system and method. Background technique [0002] Changqing Oilfield spans the three provinces of Shaanxi, Gansu and Ningxia. Faced with the outstanding contradiction between the rigid growth of ground facilities brought about by the continuous stable production of the oilfield and the company's labor shortage, the unattended construction has opened up a new path to alleviate the company's labor tension. It has strong reference significance for the transformation, upgrading and modernization of oilfield companies. [0003] The existing two-stage dehydration station process operation has the following problems: [0004] (1) Equipment: [0005] 1. The water-containing oil from the well site enters the ball collecting device, and the ball collecting device has no pressure display. If the pipeline is blocked, the pressure w...

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Problems solved by technology

[0005] 1. The water-containing oil from the well site enters the ball collecting device, and the ball collecting device has no pressure display. If the pipeline is blocked, the pressure will become higher and higher, and the temperature control function, the temperature here is too high, both of which will bring production hazards;

[0006] 2. The remainder of the medicine in the dosing device at the original station needs to be manually inspected to know whether it is time to add the medicine. If the medicine is not found in time when the medicine is used up, the dosing device will keep stirring, which will easily cause machine loss, and the inspection personnel will also It takes multiple checks to grasp the exact dosing time;

[0007] 3. The heating furnaces in the original station required manual monitoring of the water level, manual ignition or shutdown at close range, and no over-temperature protection function. There were many hidden dangers, frequent inspections, and personnel safety could not be guaranteed;

[0008] 4. The original buffer tank has no pressure display, so it is impossible to determine whether the pressure vessel is working normally;

[0009] 5. If the pressure of the original export pump is too high, it will easily lead to overpressure of the entire export system and affect the normal operation of the upstream and downstream stations;

[0010] 6. The outlet of the associated gas separator in the original station uses a gate valve to control the discharge of condensate. The staff need to manually discharge the condensate every day. The labor intensity is high, and frequent contact with condensate is harmful to physical and mental health;

[0011] 7. The liquid level of the settling tank and purification tank of the original station needs to be manually measured on the tank, which is not safe

This causes a hysteresis between the analysis results and the actual value, inaccurate measurement of the water content of purified oil, frequent manual inspections, and manual switching of valves to switch the process, resulting in a large workload

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