A method of measuring the rate of production of oil wells in sealed systems of collection and device for its implementation

 

The invention relates to oil production and can be used for the operational records of flow rates of production of oil and gas condensate wells in sealed systems collection. The task of the technical solution is to improve the accuracy and stability of measurements. The method includes determining the time of filling the calibrated volume measuring capacity production wells, the hydrostatic pressure at a known height of the liquid column, pressure, temperature, parameters of the gas fraction at the effects on the contents of the bottle and the calculation of the performance of the liquid, oil, water and gas on the basis of the received data and the known densities of oil and water contained in the production wells. Measuring capacity at a pressure reservoir fill non-separated production wells without the possibility of release of gas and mixing with other environments, compress it before reaching the saturation pressure. After compression measure the volume of production wells and hydrostatic pressure, and then push out without the rest of the contents of the measuring vessel to the collector of the amount of liquid and gas in wells judged on the obtained values of the volumes before and after melting the mass of the gas, which can stand out from the oil under normal conditions. When calculating the flow rate of gas based on the measured volume of gas that was in the measuring vessel as part of the production wells at a pressure manifold, use curves degassing of the deep samples. The device has a measuring capacity of the calibrated volume, bound pipeline valves, equipped with sensors of its content, hydrostatic and pressure, thermometer and timer. Measuring capacity is made with the possibility of changing its displacement upon receipt of the production wells, the regulation of the pressure inside the tank when filling up the values of manifold pressure and compression products well before reaching the saturation pressure, for example, in the form of the node that contains the cylinder with the plunger, press to move the plunger and adjustable shock unilateral actions associated with the plunger of the hydraulic cylinder. 2 c. and 1 C.p. f-crystals, 1 Il.

The invention relates to oil production and can be used for the operational records of flow rates of production of oil and gas condensate wells in sealed systems collection.

Widely known method isobutyl AM...", where capacitive separator from production wells separated gas bubble, and then the separated liquid is passed through the turbine meter volume (1).

The disadvantages of this method and device are:

poor information content, due to the inability to determine the water content of oil and gas production;

- high demands on the quality of separation;

- low accuracy and stability of measurements;

- the complexity of the device.

The closest technical solution is a hydrostatic method of measuring the rate of production of oil wells for liquid, oil, water and gas, including determining the time of filling the calibrated volume measuring capacity production wells open to the manifold gas and closed drain liquid lines, the determination of the hydrostatic pressure at a known height of the liquid column, pressure, temperature, time of displacement of the tank's contents after closing the gas line and opening the discharge liquid line header and the calculation of the performance of the liquid, oil, water and gas on the basis of the received data, and the known densities of oil and water, contained in productie deposits of paraffin on the elements of the calibrated measuring vessel, the need for frequent cleaning of paraffin;

the loss of efficiency at low gas factors associated with the inability to push water oil liquid from the measuring vessel to the collector and to hold measuring the speed of emptying the calculation of the performance of gas wells;

- instability measurements at high foaming;

- very strict requirements to the quality of the separation.

This principle is applied in known automated metering installation type "Satellite M..." containing bound pipeline valves gas separator and measuring the capacity of the calibrated volume, equipped with sensors of its content, hydrostatic and pressure, thermometer and timer (2).

The disadvantages of the known measuring devices are:

most consumption;

- the lack of customizability of the hydraulic resistance of the device under the manifold pressure, its effect on the well during the measurement and the distortion of the real values of flow rates.

The objective of the proposed technical solutions to improve the accuracy and stability of measurements of self-purification of deposition of paraffin on the elements of the calibrated measuring amcorder, to increase the accuracy of measurements by the customizability of the hydraulic resistance of the device under the manifold pressure, and reduce the consumption due to the exclusion of separating elements from the device.

A method for measuring the rate of production of oil wells in sealed systems of collection, including determining the time of filling the calibrated volume measuring capacity production wells, the hydrostatic pressure at a known height of the liquid column, pressure, temperature, parameters of the gas fraction at the effects on the contents of the bottle and the calculation of the performance of the liquid, oil, water and gas on the basis of the received data and the known densities of oil and water contained in wells, characterized in that the measurement tank at a pressure reservoir fill non-separated production wells without the possibility of release of gas and mixing with other media compress it before reaching the saturation pressure after compression measure the volume of production wells and hydrostatic pressure, and then push out without the rest of the contents of the measuring vessel to the collector of the amount of liquid and gas E, moreover, when calculating the flow rate of oil from the mass of oil after a certain compression wells, subtract the mass of the gas that can be emitted from this oil under normal conditions.

When calculating the flow rate of gas based on the measured volume of gas that was in the measuring vessel as part of the production wells at a pressure manifold, use curves degassing of the deep samples.

The proposed device for implementing the above method, containing the measuring capacity of the calibrated volume, bound pipeline valves, equipped with sensors of its content, hydrostatic and pressure, thermometer and timer, characterized in that the measuring tank is made with the possibility of changing its displacement upon receipt of the production wells, the regulation of the pressure inside the tank when filling up the values of manifold pressure and compression products well before reaching the saturation pressure, for example, in the form of the node that contains the cylinder with the plunger, press to move the plunger and adjustable shock unilateral actions associated with the plunger of the hydraulic cylinder.

Compression products well into the measuring emotionalist and significantly improve the accuracy and stability of measurements. Forced emptying of the measuring capacitance allows to make measurements in wells with very low gas factor. Subtract the mass of gas that can be emitted from oil under normal conditions, when calculating the flow rate of oil based on the weight of oil, after a certain compression wells, will also enhance the accuracy of measurement.

The use of curves of deep degassing of samples in the calculation of gas production on the basis of the measured volume of gas that was in the measuring vessel as part of the production wells at a pressure manifold simplifies calculations.

Regulation of the pressure inside the tank when filling reduces the influence of the measuring device in the borehole during the measurement and to make the measurements more accurate. The use of cylinder plunger as measuring containers allows you to clean the paraffin in each measurement and eliminates the problem of frequent cleanings from paraffin and precalibrated measuring containers.

The drawing shows a device that implements the proposed method.

The device comprises a cylinder 1 with a piston 2, press 3 and the absorber unilateral action 4 associated with the plunger gidrol is lectora. Deep in the lid of the cylinder 1 are thermometer 10 and the pressure transducer 11. On the lower end of the plunger 2 is gauge pressure 12. Lead screw 13 press 3 connected to the selsyn transmitter 14, which determines the position of the plunger 2 when it is moved under the influence of the stop 15. The absorber unilateral action 4 is equipped with a check valve 16 and an adjustable throttle 17 controlled by a selsyn controller (positioner) 18. On a manifold equipped with a pressure gauge 19.

The method is implemented as follows.

Before you begin measuring device in its control computer (not shown) enter values in the density of the oil at normal (standard) conditions and produced water, as defined by the laboratory. To calibrate the measuring capacity of the cylinder 1 by determining the dependence of the mass of liquid (water) in the range of the stroke of the plunger 2, the height of the level of vzliva defined by the selsyn transmitter 14.

In the initial position of the plunger 2 of the cylinder 1 is at the bottom, and the stop 15 is in its extreme upper position. Valves 8 and 9 are closed.

When opening the valve 9 downhole pipe 6, the plunger 2 of the cylinder 1 begins to rise and PT is amortizator unilateral action 4 provides resistance to movement of the plunger 2, creating pressure in the working cavity of the cylinder 1. The resistance value, and hence the pressure in the working cylinder cavity 1, which should be equal to the pressure reservoir 7, is determined by the selsyn encoder 18 of the throttle 17.

After fixing the time of filling of the working cavity of the cylinder 1, the valve 9 is closed, lead screw 13 press 3 starts to rotate, and the stop 15 moves the plunger 2 down, squeezing the contents of the working cavity of the hydraulic cylinder 1 to the saturation pressure. Signal the end of compression is the reading of the pressure gauge 11. At the signal of the pressure gauge 11 is removed reading of the selsyn transmitter 14, which determines the position of the plunger 2 of the cylinder 1. By the same signal produced measurements of hydrostatic pressure and temperature.

Knowing the source pressure, saturation pressure curves and the degassing and temperature at the beginning and end of the compression stroke), the stroke of the plunger 2 of the cylinder 1 is judged on the gas production.

Knowing the temperature, the height of the liquid column (to the plunger 2), the density of the oil (under standard conditions and at a pressure of saturation) and formation water contained in the production wells, the magnitude of the hydrostatic pressure is judged on the percentage of water in the production of the 1, then the reading of the selsyn transmitter 14 at the end of the compression stroke corresponds to the volume of the liquid phase in the portion of the production wells, which appeared in the cylinder 1. Knowing the time of filling of the cylinder 1, the volume of the liquid phase and the density of its components, is judged on the performance of the well fluid, oil and water.

After the measurement open valve 8 to the collector line 7, and the contents of the working cavity of the cylinder 1 under a lot of pressure goes into the oil collecting reservoir. When the plunger 2 is moved to the lowest position, crushing in the collector paraffin, and raise the stop 15 to its extreme upper position.

Here is one of possible algorithms for the calculation of the rate of production of oil wells.

Compression wells in the measuring capacity of the calibrated volume before reaching the saturation pressure is the complete dissolution of gas in liquid, and the amount of content measuring capacity is reduced from V to V1then the amount of free gas contained in the measuring tank, after filling when the manifold pressure is equal to

V2=V-V1/KGZ, m3

where V is the calibrated volume of the measuring vessel

(or the volume of production wells, filling the liquid, containing water and oil with dissolved gas at a pressure of saturation;

CWG - coefficient taking into account the increase in the volume of oil due to the dissolution therein of gas at the saturation pressure (neglect, or determined by the laboratory or calculated by the formula

where In - water cut wells;

hN. yis the density of the oil at normal (standard) conditions (known from geological data value);

hA. nis the density of the oil with dissolved gas in the production well after its compression in the measuring tank to the saturation pressure at the temperature of measurement (known from geological data or interpolated value);

=T-t/2, with

where- conditional the time of filling of the measuring vessel;

T - the time from the beginning of opening of the valve downhole pipe to the end of filling of the measuring vessel;

t is the time from the start of opening of the valve downhole pipe to its full open (take a passport or determined empirically).

V1=VC+V hA. nm3

where VC is the volume of water in productsit almost incompressible);

V hA. n- the volume of oil with dissolved gas in the production well after its compression in the measuring tank to the saturation pressure.

wherein - the density of water in wells (known value);

W is the density of the fluid in the production well after its compression in the measuring tank to the saturation pressure (determined on the basis of the readings of the pressure transducer, for example, by the formula

W=JK/H, t/m3

where J is the reading of the pressure transducer;

KP is the coefficient of proportionality;

H - the height of the liquid column (wells after its compression in the measuring vessel of cylindrical shape to the saturation pressure).

VC=v1-V hA. nm3

According to the calculated value of V2and with the help of curves of deep degassing of samples to determine the gas volume VGN. ythat will stand out from the VHA. nunder normal (standard) conditions.

Thus, knowing the density of the gas under normal conditions (gN. yand the acceleration of gravity g, the weight flow rate of oil is equal to

Q=QN. W.+Q, t/day.

Volumetric gas production

Gas factor

The application of the proposed method and device (sealed systems collect oil will improve the accuracy and reliability of measurements of the rates of production of oil wells, to reduce capital costs and operating costs.

Sources of information

1. Isakovich R. J., Loginov Century. And., Popadic C. E. automation of production processes in the oil and gas industry, Moscow, “Nedra”, 1983, S. 314-334.

2. Abramov, S. and other Automated measuring system for measuring the flow rate of oil wells. NTE automation, program and communication in the oil industry”, Moscow, JSC “VNIIEM, No. 1-2, 2001.

Claims

1. A method of measuring the rate of production of oil wells in sealed systems of collection, including determining the time of filling the calibrated volume measuring capacity production wells, the hydrostatic pressure at a known height of the liquid column, pressure, temperature, parameters of the gas fraction at the effects on the contents of encosta of oil and water, contained in wells, characterized in that the measurement tank at a pressure reservoir fill non-separated production wells without the possibility of release of gas and mixing with other environments, compress it before reaching the saturation pressure after compression measure the volume of production wells and hydrostatic pressure, and then push out without the rest of the contents of the measuring vessel to the collector of the amount of liquid and gas in wells judged on the obtained values of the volumes of the contents of the measuring vessel before and after compression, and when calculating the flow rate of oil from the mass of oil after a certain compression wells, subtract the mass of the gas, which can stand out from the oil under normal conditions.

2. The method according to p. 1, characterized in that in the calculation of gas production on the basis of the measured volume of gas that was in the measuring vessel as part of the production wells at a pressure manifold, use curves degassing of the deep samples.

3. Device for measuring the rate of production of oil wells, sealed collection that contains the measuring capacity of the calibrated volume, bound pipeline amaturejamaica fact, that the measuring tank is made with the possibility of changing its displacement upon receipt of the production wells, the regulation of the pressure inside the tank when filling up the values of manifold pressure and compression products well before reaching the saturation pressure, for example, in the form of the node that contains the cylinder with the plunger, press to move the plunger and adjustable shock unilateral actions associated with the plunger of the hydraulic cylinder.

 

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