RU1818336C - Method for control of oil emulsion demulsification process - Google Patents

Abstract

Usage: control of the oil dehydration process at oil treatment plants, as well as in the oil and oil refining industries. SUMMARY OF THE INVENTION: the differential pressure in the NE stream is measured, the coefficient of flow resistance is determined along the length of the inlet pipe, and a correction is made by adjusting the dosage of the demulsifier. 1 silt

Description

The invention relates to the field of controlling the process of oil dehydration in oil treatment plants and can be used in the oil and refining industries.

The purpose of the invention is to reduce the cost of crude oil.

This goal is achieved by the fact that in the known method, which consists in adjusting the dosage of the demulsifier depending on the temperature and flow rate of NE and the concentration of water in it, the pressure drop in the oil emulsion stream is additionally measured along the length of the inlet pipe, the flow resistance coefficient is determined and a correction is introduced therein when adjusting the dosage of the demulsifier.

The raw material (NE) supplied to the preparation plant is multicomponent and each component (parameter) in a certain way affects the dosage

demulsifier. The creation of a control system for the process of NE destabilization, taking into account only the isolated effect of individual NE quality parameters on the dosage of a demulsifier, is not effective, since all parameters characterizing the physicochemical properties of NEs are correlated. To take this factor into account, the proposed method used a generalized parameter, the coefficient of resistance of the NE stream, allowing to take into account the correlation of physicochemical parameters in the form of an analytical formula:

A.T. (D

uOneUne / -Wpe + (1-Wj / H, (2)

V O.NZ / LZSG

(3)

where I is the coefficient of resistance;

d is the diameter of the inlet (inlet pipe);

AR is the pressure drop in the NE stream along the length of the inlet pipe;

00

00

with

Oj

with

I is the distance between the pressure sampling points for determining L P;

RNE and vH3 are, respectively, the density and flow rate of NE;

W is the concentration of water in the NE;

One - consumption of NE;

PR and pH - respectively, the density of formation water and oil,

and therefore reduce the cost overrun of the demulsifier. This proves the correctness of the goal and significant differences of this method.

When conducting patent research, the applicant did not find a technical solution known in science and technology with similar features. In this regard, we can conclude that the claimed technical solution has a significant difference.

The drawing shows a diagram of the implementation of the method.

Through the inlet (supply) pipe 1, the NEs through the heater 2 enter the sump (dehydrator) 3. The NE is dehydrated. With a minimum residual water content, it is discharged from the sump through pipe 4, and the water released from the drain through pipe 5. To destroy the armor shells of emulsified waters of droplets with a metering pump b, a demulsifier (chemical reagent) is fed into the NE stream through pipeline 7.

Temperature, NE flow rate and water content (concentration) in it are measured by sensors 7,8,9 and corresponding transducers 10, 11. 12. The pressure difference in the flow of NE along the length of the pipe 1 is measured by sensors 13,14, transducer 15, and the flow rate of the demulsifier is measured by the sensor 16 and the transducer 17 and the specific flow rate (dosage) of the demulsifier is controlled by a ratio regulator 18 with the action on the actuator 19 installed in the bypass line of the pump 6.

Computing unit 19 on the basis of the incoming information by formulas (1NZ) calculates the value of the coefficient of resistance of the flow of NE (A) and compares it with the nominal value and the error signal from the output of the computing unit enters the regulator of the ratio of the flow rates of the demulsifier and the NE in the form of correction settings

controller based on correction signal

acts on the actuator

19 and changes the dosage of the demulsifier.

When calculating the value of I by the formulas

BHA), the values of pb and p are used. These are entered manually into the computing device.

The method is implemented as follows. Depending on the change in the value of temperature and flow rate of NE and the concentration of water in it, measured by corresponding sensors 7,8,9 and transducers 10,11,12, RB calculates and sets a new value to the setpoint to the regulator of the ratio 18, which, with the effect on the executive mechanism 19 changes the specific consumption of chemicals. RB also on the basis of information about the pressure drop in the flow of NE along the length of the inlet pipe,

Claims (1)

obtained from the output of the Converter 15, and the value of the density of produced water and oil, manually entered according to the formulas ONZ). calculates the values of the coefficient of resistance of the flow of NEs, compares its current value with the nominal value and, when deviating to the positive side, proportionally increases the setpoint value of the regulator 18 and vice versa, the Formula of the invention -A way of controlling the process of demulsification of an oil emulsion, including controlling the supply of a demulsifier depending on the temperature and flow rate of the oil emulsion and the concentration of water in it, characterized in that, in order to reduce the cost of salable oil, the pressure drop in the oil emulsion stream is additionally measured along the length of the inlet pipe, the coefficient of flow resistance is determined, and the flow rate of the demulsifier is adjusted in direct proportion to its change. No. H