RU179828U1 - DEVICE FOR DETERMINING THE OIL GAS FACTOR - Google Patents

Abstract

The utility model relates to oil production, namely, devices for determining the gas factor. The technical result of the utility model is to reduce material costs and simplify the procedure for determining the gas factor. For this, the device contains a separator and valves for supplying oil and gas mixture, removal of oil gas and produced water. The separator is made in the form of a calibrated measuring vessel made of thick-walled glass, muffled from the ends by stainless steel flanges. The axis of the tank is perpendicular to the horizontal surface. The valve for supplying the oil and gas mixture is connected to the lower flange of the tank. The container at the bottom is equipped with a uniform distribution unit. The oil gas vent valve is connected to the top flange of the tank. The top flange of the tank is equipped with a pressure gauge, thermometer and level sensor. The formation water drain valve is connected to the bottom flange of the tank. 1 ill.

Description

The utility model relates to oil production, and in particular to devices for determining the gas factor.

A known installation according to the method for determining the flow rates of oil, associated gas and water [1].

The installation fills the measuring tank with well products and, after reaching the maximum level of the oil-water mixture, closes the inlet tap of the measuring tank and holds in time to separate free gas from the liquid. After determining the flow rate of the oil-water mixture by the filling speed and the volume of the separated liquid, the gas phase is gradually taken from the upper part of the measuring container by the compressor through a reducer reducing to atmospheric pressure. In this case, the compressor pumps the sampled gas into the well reservoir. Gas is pumped out until the pressure in the measuring tank drops to atmospheric value. The gas factor is calculated by compressor performance and its operating time.

The disadvantage of the installation is the need to use a large amount of equipment (compressor, level sensor), as well as low accuracy in the case of measuring persistent oil-water emulsions.

A well-known mobile installation [2] for measuring the flow rates of liquid and gas UGF 2.5-200, including two gas separators, a receiving tank of degassed liquid, a pump for pumping liquid into the oil collector and a detachable flare line with a riser for burning gas. The installation is connected to the wellhead or AGZU Sputnik and allows continuous measurement of the flow rate of the liquid (oil-water mixture) and gas. The gas-liquid mixture entering the unit undergoes a three-stage separation.

The disadvantages of the known installation for measuring flow rates of liquid and gas are:

design complexity, high operating costs;

incomplete degassing of oil in the separators, the residual content of dissolved gas leads to significant errors and measurement errors of 4 ... 6%.

The most widely used methodology is a comprehensive study of the composition and properties of reservoir oils [3], which includes the selection of deep and recombined samples of reservoir fluids, transferring selected samples to PVT installations and bringing them to reservoir conditions, sample degassing at given temperatures and pressures. In this case, gas factors are measured under degassing conditions.

The disadvantage of this method is that the implementation of the method requires significant costs associated with the selection and delivery of samples, transferring them to the installation and further research.

The technical problem facing the utility model is to reduce material costs, simplify the procedure for determining the gas factor.

To this end, the device comprises a separator and valves for supplying the oil and gas mixture, removal of oil gas and produced water. The separator is made in the form of a calibrated measuring vessel made of thick-walled glass, muffled from the ends by stainless steel flanges. The axis of the tank is perpendicular to the horizontal surface. The valve for supplying the oil and gas mixture is connected to the lower flange of the tank. The container at the bottom is equipped with a uniform distribution unit. The oil gas vent valve is connected to the top flange of the tank. The top flange of the tank is equipped with a pressure gauge, thermometer and level sensor. The formation water drain valve is connected to the bottom flange of the tank.

In FIG. 1 shows a device for determining the gas factor.

The device for determining the gas factor contains a calibrated measuring vessel 7 made of thick-walled glass and plugged from the ends with stainless steel flanges, a valve for supplying a water-oil mixture 1 with a perforated pipe 6, valves for removing oil gas 3 and produced water 2, a pressure gauge 4, a thermometer 5, a level sensor 8, adjusting screws 9.

Before starting the measurement, the device is installed vertically using the adjusting screws 9 and the level sensor 8 and is filled with a solution of sodium chloride with a density of 1.18-1.20 g / cm ³ .

The water-gas-oil mixture from the pipeline enters the device for determining the gas factor through the valve 1 and the perforated pipe 6. The gas-oil mixture, the specific gravity of which is less than that of the sodium chloride solution, rises to the upper part of the separator. In this case, the water contained in the oil is separated when passing through a layer of mineralized water. The perforated pipe splits the total flow of the gas-oil mixture, providing greater contact with saline water.

The pressure required for measurement in the device is maintained by opening and closing the valve 2 and is controlled by a pressure gauge 4. In the upper part of the device, gas is released from the oil.

After entering the device oil column height 1 cm on the graduation on the glass body, valves 1 and 2 is closed, the contents of the device is maintained for 10 minutes and recorded post height readings gas _G1 phase V, P _{C1 C1} t pressure and temperature.

и объем нефти после последней ступени сепарации V_нn. Пробу нефти для определения остаточной обводненности отбирают при освобождении устройства или вытесняют необходимое количество через вентиль 3, создавая давление через вентиль 1.Then, opening the valve 2, reduce the pressure in the device to a predetermined value P _C2 and again take readings of the height of the gas column V _G2 . Depending on the given number of degassing stages, the operations are repeated until atmospheric pressure P _{0 is} reached in the device, while fixing the gas volumes at each separation stage

and the volume of oil after the last separation stage V _nn . An oil sample to determine the residual water cut is taken when the device is released or the required amount is displaced through valve 3, creating pressure through valve 1.

The gas factor at the separation stage is calculated by the formula:

,

,

- объем выделившегося газа на n-ступени сепарации при стандартных условиях, см³;Where

- the amount of gas released at the n-stage of separation under standard conditions, cm ³ ;

m _n is the mass of oil, g;

вычисляют по формуле:

calculated by the formula:

,

,

where V _Гn is the volume of gas released at the n-stages of separation, cm ³ ;

V _Гn-1 - the amount of gas released at the n-1 stage of separation, cm ³ ;

A is the coefficient of bringing the gas to standard conditions (temperature 20 ° C, pressure 0.1013 MPa).

The value of m _{n is} calculated by the formula:

m _n = (V _nn -V _c ) × ρ _n ,

where V _nn is the volume of oil after the last stage of separation (P ₀ = 0,1013 MPa), cm ³ ;

V _in - the volume of residual water in oil, cm;

ρ _n - oil density under normal conditions, g / cm ³ .

Thus, the claimed invention allows to reduce material costs and simplify the procedure for determining the gas factor of oil.

Information sources

1. RF patent No. 2504653. A method for determining the flow rates of oil, associated gas and water. Claim 01/30/2012, publ. January 20, 2014

2. M.D. Valeev et al. Comparative analysis of measuring installations for determining the gas factor. “Oil industry” No. 1, 2011.

3. V.N. Mamuna et al. Experimental study of reservoir oils. - M. GOSNINTI. 1960.

Claims (1)

A device for determining the gas factor of oil, characterized in that it contains a separator made in the form of a calibrated measuring vessel made of thick-walled glass, damped from the ends with stainless steel flanges, graduated and made with the possibility of measuring the gas factor directly in the sampling process, moreover, the upper flange is equipped with a thermometer, a manometer, a level sensor, an oil gas drain valve, and the lower flange is equipped with a formation water drain valve, an oil-gas mixture supply valve and, which is connected to a perforated nozzle located in the lower part of the separator, while the verticality of the device is provided by adjusting screws.

Images