SU1553661A1 - Device for measuring yield of oil wells - Google Patents

Abstract

This invention relates to a measurement technique and is intended for the oil industry. The goal is to increase the reliability of the measurement. The device contains a vertical cylindrical separator 1 with a hydrocyclone, two pressure sensors 5 and 6 installed at different levels, a gas line 13 with a valve 14, an inlet and outlet lines and a microprocessor 17. Inside the separator 1, sedative grids 3 and 4 are formed, forming a measurement cavity. Inside the gratings 3, 4, the sensors of the lower 7 and upper 8 levels are located near the side wall of the separator 1. The outlet line is made in the form of a siphon 11. Such a design of the device in combination with the microprocessor 17 makes it possible to determine the flow rate of the well, the composition of the liquid in volumetric and mass units. As well as this device provides control of the geological parameters of oil reservoirs for oil, water and gas flow rates. 1 il.

Description

where V is the volume of the dimensional part of the separation- 15 The mass of oil is determined by the shape

torus, m3;

- time interval of accumulation of a portion, p.

The flow rate in mass units is determined by the formula V

O - kg / sC) GD

xm .Ј kg / s, (.. „У

The mass of a portion of a fixed volume of 25 in the dimensional part 12 of the separator is determined by the formula

4P-S -, kg,

(3)

differential pressure between fixed levels, Pa; - the average value of the cross-sectional area of the dimensional part of the separator, m2;

g is the acceleration of free fall, 35 of the bone from the sensor 8 of the upper level to

m / s2

Based on the volume and mass of the portion of the liquid enclosed in the measurement cavity 12, the density of the mixture is determined by the formula

40

sensor 7 of the lower level, i.e. for a calibrated value of volume for a fixed time (dtrc, io) by the formula:

V

-at

Q,

M3 / S

guy

M

fcM-, Kg / m3

(four)

and then the water cut is calculated by the formula

Fa

h -

G cm

100%, (5)

Where

W is the water cut of the n-eft of the measured portion,%; about - density of produced water by

this well, kg / m3; The pH is the density of the degassed oil for this well, kg / m3.

Since the densities of water and oil for a particular well are slowly varying, data on

le

M n M (1 - W). (7)

The volume content of oil is determined by the dependence

0 v

Where

five

n

V (8)

M fflРн

YfjLiJL

Re Re

oil volume, m3;

volume of a measured part of a separator, m3;

measured mass of the mixture, kg; formation water density, kg / m3;

the density of degassed oil, kg / m3.

The amount of gas entering the separator is defined as the increment of the volume of the gas space in the separator 1 when the liquid level drops.

0

sensor 7 of the lower level, i.e. for a calibrated value of volume for a fixed time (dtrc, io) by the formula:

V

-at

Q,

M3 / S

guy

where V is the volume of the calibrated part of the separator between the sensors 7 and 8 level, m3;

5 At the time of decreasing the level of liquid from sensor 8 to sensor 7, p.

In this case, the measured amount of gas is automatically corrected by the microprocessor 17c using the values of temperature (sensor 15) and pressure (sensor 16) to normal conditions in accordance with the dependencies of the gas volume on the current parameters (P and T).

In general, increasing the reliability of measurement is provided by using two level sensors installed

In soothing grids, and vykida

Lndkost, made in the form of a siphon.

i

Such a design, in combination with a microprocessor, makes it possible to determine the flow rate of a well by liquid, the composition of the liquid (water, oil) in volumetric and mass units and the gas flow in volumetric units.

The use of the invention provides control of the geological parameters of oil reservoirs along jj d | ebits of oil, water and gas, and in case of their deviation from the normal mode, it becomes possible to take operative measures.

j

Claims (1)

Invention Formula An oil well flow measurement device comprising a vertical cylindrical separator with a hydrocyclone, two pressure sensors installed at different levels, a gas line with a valve, inlet and outlet liquid lines and a microprocessor, characterized in that, in order to increase the measurement accuracy, it is equipped with installed in a separator. quiescent gratings forming the measurement cavity, and placed inside them at the side wall of the separator with sensors of the lower to upper levels, and the discharge liquid and the line is designed as a siphon.