SU1454826A1 - Method of automatic control of process of oilfield stabilization of oil - Google Patents

Abstract

The invention relates to the regulation of the processes of stabilization of oil and can be used in the oil industry to reduce energy costs, while measuring gas flow, saturated vapor pressure of unstable and stable oil, consumption of the top product, the magnitude of which is the ratio of pressure in the steam. the pressure difference of saturated vapor of an unstable and stable oil is calculated by calculating the flow rate of gas supplied to the column, the limiting value of which limits the flow of unstable oil, and Otherwise, deviations from the limiting value of the feed gas are redistributed along the height of the stabilization column. The rate of irrigation is adjusted with a correction for the difference in pressure of the saturated vapors of unstable and stable oil. 2 Il. (L

Description

one

The invention relates to a method for controlling stabilization processes - oil and can be used in oil industry in stabilizing oil in fields.

The aim of the invention is to reduce the energy costs of field stabilization of oil.

FIG. 1 shows a diagram of a device that implements a method for regulating the process of stabilization of oil; in fig. 2 - diagram of the main controller.

The device contains: a stabilization column 5, into which unstable oil is fed via pipeline 2 and petroleum gas via pipeline 3, condenser / cooler 4, separation tank 5, from which condensate gases through pipeline 6 and unstable gasoline pipeline 7, sensors 8-10 of unstable oil flow, oil gas, overhead (vapor phase), main regulator 11, pipeline 12 at the stable oil outlet, sensors 13, 14 of saturated vapor pressure, stable oil and in the column, the pressure torus 16, valve 17, gas flow controller 18, valve 19, irrigation flow controller 20, pump 21, flow sensor 22, valve 23, adders 24, 25, divider 26, multipliers 27 - 29 selector 30 .

The method is carried out as follows.

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31454826

Unstable oil 2 and oil gas 3 are introduced into stabilization column I, the vapor-gas phase, which passes through condenser-cooler 4, separation tank 5 and separated into non-connected, is withdrawn from the top of the column. sirovanny gases and unstable gasoline.

Information on the flow rate of unstable oil, petroleum gas, overhead product from flow sensors 8-10 arrives at the main regulator, 11, Pressure values of unstable oil saturated vapors and stable oil are measured by pressure analyzers (sensors) 13, 14 vapors, the output signals of which are fed to the main regulator 1I. The pressure value in the column is measured by the sensor 15, the output of which is fed to the main regulator 11, the pressure in the column is maintained by a constant regulator 16, changing the flow rate of non-condensed gases from the separation vessel 5 by the valve 17.

On the basis of the initial information, the main controller 11 forms the task for the gas flow controller 18 for ne. Switching valves 19 and regulator 20 to the flow rate of unstable gasoline irrigation depending on the pressure difference of the gross vapor is unstable

stable and stable uPg Pg oil

- R,

52

Unstable gasoline supplied for irrigation by the pump 21 is measured by the flow sensor 22 and corrected by the regulator 20 of the flow of the unstable gasoline through the valve 23.

The main regulator 11 issues a command to switch the valves of the oil gas supply plates, thereby opening or closing the corresponding valve 19, thereby redistributing the gas along the height of the column.

The flow rate of petroleum gas is corrected in a function of the change in flow rates of unstable oil Q and and the top product V, the pressure in the column P ,, the pressure difference of all airborne vapor of unstable and stable oil.

The stability of oil is ensured by maintaining the pressure of ossified vapors of stable oil R., at a given

zg

level

 - uPg

LR

V iu

m,

(one)

the molecular weight of the vapor-gas mixture;

oil gas molecular weight;

vapor phase mass (consumption of the top product); pressure in the column;

the difference in pressure of saturated vapors of unstable and stable oil. The limit of change in gas flow is limited by the condition

5g

C. Q

n)

(2)

where Q (is the flow rate of unstable oil; C is a coefficient that depends on the technological parameters of the process.

The main controller 11 automatically implements equations (1) and (2) with respect to the consumption of petroleum gas.

The calculated values of the flow rate of oil gas are OOr and are used as driving forces for the oil gas flow rate regulator. Depending on the difference in LR, the ratio is

irrigation K.

The pressure P in the stabilization column support valve 17.

The molecular mass of the vapor-gas mixture M. and petroleum gas H is set as G in the form of settings. The mass of the vapor phase is assumed to be proportional to the consumption of the upper product.

Information on the vapor pressure of unstable Pg, and stable Pd of oil enters the adder 24 (Fig. 2), the signal Pg is fed to the positive, and the signal Pd to the negative inputs. The output of the adder 24 is the difference between the DDA. The output signal & RD is applied to the flow controller, the divider 26, and the negative input of the adder 25, to the positive input of which the signal Rc (pressure in the stabilization column) is applied. The output of the adder 25 (P-LR) is fed to divider 26, where the ratio

To determine the flow rate of petroleum gas, the ratio of

Pk - UPs

ui c;

VfV3 7) hVQOUdOU / Kyf) 3dT) H

one

Ou

TT

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Claims (2)

Claim 1. A method for automatically regulating the process of field stabilization of oil by regulating the flow of irrigation depending on the flow rate of unstable oil and pressure in the stabilization column, characterized in that, in order to reduce energy costs, additionally measure gas flow rate, saturated vapor pressure of unstable and stable oil, flow rate the top product, while the magnitude of the flow rate of the top product and the ratio of the pressure in the column to the pressure difference of the saturated vapor of an unstable and stable oil is calculated dissolved supply flow rate in the column of gas, the limit value is restricted by the unstable flow of oil, and the largest deviations from the limit value, the feed gas redistribute adjustment stabilization column. 2. The method of pop. 1, characterized in that the irrigation rate is adjusted with correction for the difference in pressure of saturated vapors of an unstable and stable oil. Phi *. 1