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 filling the measuring capacity of the calibrated volume of production wells which are 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, speed of displacement of the liquid gas from the container after the closure of the gas 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 the production wells. The time of filling measuring capacity production wells set in advance with regard to the maximum performance of the device. After a predetermined time, the flow of well production into the measuring tank stop, production wells, contained in the measuring tank, stand up to the state of complete absence of the bubble ha the closing of the gas and the opening of the discharge liquid line header resume the flow of well production into the measuring container. The device comprises a package piping valves volumetric gas separator and calibrated measuring vessel equipped with sensors of its content, hydrostatic and pressure, thermometer and timer, and the flow switch that connects the gas line separator and measuring capacitance, collector and drain liquid line measuring containers. Pipe fittings are made with the possibility of switching the flow of input from wells in the reservoir and from the well to the separator, for example, using the flow switch and sensor filling of the measuring vessel has analog tracking of any liquid level, for example, radar or rheostat type. 2 S. 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.

The known method of accounting for production of oil wells, according to which in the annular space of the well can withstand the portion of the accumulated products to its separation into components (gas, oil and water) under the action of gravitational forces, then these components potokiem passing of each component, the components are identified, for example, an indicator of the density (1).

The disadvantages of this method are the low accuracy due to the impossibility of full separation of production wells without heating and the introduction of chemicals, and also the long duration of each measurement.

It is known a device for implementing this method, containing packer, flow transducer, the processor module, pressure sensor and on-off valve switch at the wellhead for the message annulus with the cavity of the tubing (tubing) (1).

However, when using the known device the pressure of the reservoir is distributed on the casing, which leads to violation of its integrity.

The closest technical solution is a hydrostatic method of measuring the flow rate of the liquid, oil, water and gas, including determining the time of filling of the measuring vessel partially separated products well fixed volume open on the gas collector and closed drain liquid lines, the determination of the hydrostatic pressure at a known height of the liquid column, pressure, temperature, Skorokhod 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 the produced water and oil contained in the production well (2).

Based on this principle work automated metering stations containing bound pipeline valves volumetric gas separator and calibrated measuring vessel equipped with sensors of its content, hydrostatic and pressure, thermometer and timer, and the flow switch that connects the gas line separator and measuring capacitance, collector and drain the liquid line of the measuring vessel (2).

The disadvantages of this method and device are:

- low accuracy and jitter measurements at high loads and high well flow rates;

- very strict requirements to the quality of separation;

most consumption of the device, due to the need to have a very powerful separator.

The objective of the proposed technical solutions to improve the accuracy and stability of measurements by providing insensitivity foaming and reduce consumption by reducing the requirements to the quality of the separation, and therefore, size reduction Sep'a the products of oil wells in sealed systems of collection, including filling the measuring capacity of the calibrated volume of production wells which are 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, speed of displacement of the liquid gas from the container after the closure of the gas and opening the 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 the production wells, wherein the time of filling measuring capacity production wells set in advance with regard to the maximum performance of the device, after a predetermined time, the flow of well production into the measuring tank stop, production wells, contained in the measuring tank, stand up to the state of complete absence of a bubble of gas and sedimentation foam, then measure the height of the liquid column and the hydrostatic pressure, and then simultaneously with the closing of the gas and the opening of the liquid lines to the collector resume the flow of well production into the measuring container.

The proposed astrostart and calibrated measuring container, equipped with sensors of its content, hydrostatic and pressure, thermometer and timer, and the flow switch that connects the gas line separator and measuring capacitance, collector and drain the liquid line of the measuring vessel, wherein the valve is configured to switch the flow of input from wells in the reservoir and from the well to the separator, for example, using the flow switch and sensor filling of the measuring vessel has analog tracking of any liquid level, for example, radar or rheostat type.

Execution pipeline valves with the possibility of switching the flow of input from wells in the reservoir and from the well to the separator, and the sensor measuring capacitance analog tracking of any liquid level provide, according to the method, the filling of the measuring vessel within a predetermined time, maintaining well production to the state of complete absence of a bubble of gas and sedimentation foam followed by determination of the volume of the liquid and holding the other measurements.

The proposed method and device allow the area of production wells, including those where there is foamy oil and high gas factor.

The drawing shows a device that implements the proposed method.

The device comprises a gas separator 1, the measuring container 2, the temperature sensors 3 and 4, the analog sensor filling 5 of the measuring vessel 2, the differential pressure sensor (hydrostatic) 6, gauge pressure 7, flow switches 8 and 9, the entrance from the well 10, the output at the collector 11, the inlet pipe 12 into the measuring container 2; the pipelines 13 and 14 respectively of the separator 1 and the measuring vessel 2, the discharge liquid line 15, the outputs in the drain 16 and 17, the condensate sump 18, the valve 19, the sampler 20, the valves 21, 22, 23, 24, 25 and 26, the valve cone 27, 28, 29 and 30, the gauges 31 and 32, a relief valve 33.

The zero point of the sensor filling 5 corresponds to the "zero" of the differential pressure sensor 6.

The method is implemented as follows.

In the operation of the device is laid hydrostatic method of measuring weight, based on the dependence of the hydrostatic pressure P of the liquid column height H from the fluid density:

where q is the acceleration of free fall.

The PE the security of oil and water, defined by the laboratory. Calibrated measuring container 2 by determining the dependence of the mass of liquid (water) in the interval of the analog sensor filling 5, the height of the level of vzliva determined by this sensor.

Designate timefilling of the measuring vessel 2, in which the flow switch 9 is provided to connect the inlet of the bore 10 to the separator 1. During this time, the most prolific borehole, which is designed for measuring the device should not overwhelm its liquid calibrated volume of the measuring vessel 2.

In the beginning of the procedure of measuring the flow switch 9 is put in the position of "content", starts timing the filling, and well production from the inlet pipe 10 through a gas separator 1, in which there is a partial separation of gas from liquid, the tubing 12 is fed into the measuring container 2. When a thread switch 8 pipelines 13 and 14 is connected to the collector 11, and the discharge liquid line 15 is blocked. At the end of the countdown filling the flow switch 9 is put in the position of "draining into the reservoir," the entrance of the borehole 10 is connected with the output at the collector 11, the filling is terminated, Evia bubble of gas and sedimentation foam. Duration sludge determined empirically for each individual reservoir or well.

After the sediment record level Hiand the hydrostatic pressure of the liquid columnP (the value of the output current of Jiof the differential pressure sensor 6).

The flow rate of the liquid is determined by the following formula:

where Kp- coefficient of proportionality, t/mA defined in the calibration measuring units. Takes into account the particular object sticking its bloated all the timefluid, including that which is below "zero" analog sensor filling 5.

To determine the rate of gas flow switch 8 and 9 at the same time put in a position where the inlet from the well 10 is connected to the separator 1, and the discharge liquid line 15 is connected to the collector 11, and the gas pipelines 13 and 14 are blocked. In this position, the fluid begins to be forced out of the measuring vessel 2 coming from a well by gas.

For gas flow measurement method is used, the replacement - method PVT (pressurevolumetemperature).

The volume of the measuring vessel 2 Vimatch volume Viliquid time is fixed displacementgand the average value of the excess pressure P and the gas temperature t.

The flow rate of gas is determined by the following algorithm:

where Vi- the volume of the measuring vessel 2 between the "zero" mark of the analog sensor 5 and the liquid surface, registered analog sensor 5 after filling its sludge;

R is the average value of the excess gas pressure in the measuring vessel 2, measured by the sensor 7;

t - gas temperature °C;

Toand- compressibility factor.

The flow rate of oil

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

nthe density of oil in the production well (known value);

W- the density of the fluid in the production well (determined by the reading of the pressure transducer 6 in the interval of the analog sensor filling 5, for example, by the formula

where Ji- reading of the sensor hydrostatic pressure corresponding to the liquid column Hub> - the volume of the measuring vessel 2 in the interval of the analog sensor filling 5 (corresponding to the liquid column Hi).

The flow rate on the water

The use of the proposed technical solution will allow more extensive use of progressive hydrostatic method of measuring flow rates of production of oil wells, because the determination of the level measuring capacitance (position of the surface of the separated liquid) does not depend on the quality of the pre-separation and is not time-limited content. The lack of foam and residual gas in the fluid being measured allows to obtain more accurate measurement results.

Bibliographic data

1. A. S. No. 1437495, E 21 In 47/10, 1988, bull. No. 42.

2. Certificate of utility model No. 22179, E 21 In 47/00, 2002, bul.№7 (prototype).

Claims

1. A method of measuring the rate of production of oil wells in sealed systems of collection, including the filling of the measuring vessel calibrated volume 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, izbytochnovo 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 the production wells, wherein the time of filling measuring capacity production wells set in advance with regard to the maximum performance of the device, after a predetermined time, the flow of well production into the measuring tank stop, production wells, contained in the measuring tank, stand up to the state of complete absence of a bubble of gas and sedimentation foam, then measure the height of the liquid column and the hydrostatic pressure, and then simultaneously with the closing of the gas and the opening of the discharge liquid line header resume the flow of well production into the measuring container.

2. Device for measuring the rate of production of oil wells in systems sealed collection containing bound pipeline valves volumetric gas separator and calibrated measuring vessel equipped with sensors of its content, hydrostatic and pressure, thermometer and timer, and the flow switch that connects the gas line separator and measuring capacitance, collector and drain jekotoplenie flow of input from wells in the reservoir and from the well to the separator, for example, using the flow switch and sensor filling of the measuring vessel has analog tracking of any liquid level, for example, radar or rheostat type.

 

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