RU36858U1 - DEVICE FOR MEASURING OIL WELL DEBIT - Google Patents

Description

Device for measuring oil flow rate

The utility model relates to oilfield equipment and can be used for primary production accounting, that is, in the field of measuring and controlling flow rates at oil production facilities.

A device 1 for measuring the flow rate of oil wells, containing a vertical cylindrical separator, pressure sensors, temperature, lower and upper levels, gas, inlet (for supplying products) and exhaust liquid lines, a microprocessor, a switch for alternately connecting to the prefabricated manifold of gas and liquid lines, a check valve and a pump mounted on a liquid line.

The device measures the flow rate of the well by recalculating the difference in hydrostatic pressures at the installation sites of the upper and lower level sensors on the separator using predetermined constants (such as oil density, formation water density, cross-sectional area of the separator) and filling time of the measured calibrated volume of the separator. A specific well is connected to the device for flow rate measurement by a well switch according to the program specified by the microprocessor. The calibrated volumetric volume of the separator is limited by the sensors of the lower and upper levels, and the measurement and calculation of the flow rate for liquid and gas is provided by the microprocessor based on the information signals of the sensors during cenapaTopia operation in the “filling - emptying” mode.

The device is convenient in operation and fully provides component-wise (liquid, gas) measurement of oil well flow rates, however, this device is not sufficiently adaptive to operating conditions at commissioned fields with a significant amount of

SINGLE wells remote from the automated information measuring system (AIIS) and / or not connected to it for one reason or another. We also note that since the calibrated volumetric volume, limited by the height of the separator by two level sensors (alternately filled when measuring liquid with both high-yield and low-rate wells) is unchanged, it takes an unreasonable amount of time to measure the flow rate of low-rate wells and would be more appropriate for them install and use a smaller measured volume of the separator.

Closest to the claimed technical solution is the solution - a prototype in the form of a device 2 for measuring oil flow rate, containing a vertical cylindrical separator with pipes for connecting pipelines, a product supply pipeline, a gas outlet pipe, a fluid drain pipe, a gas pre-selection unit at the supply pipe to a well production separator, a three-way electric actuated crane, three liquid level indicator-signaling devices installed in height of separator volume, electrical temperature sensor, an electrical pressure sensor, electric differential pressure sensor, and a controller for controlling drive of a three-way faucet and to calculate the flow rate with appropriate software.

The principle of operation of the device is similar to the principle of operation of the above described device - analogue, but unlike it, the device - prototype has three sensors - a level indicator for dividing the measured calibrated volume of the separator into at least two volumes - one volume is enclosed between the extreme ones (along the height of the tank ) sensors, and, for example, the second volume is enclosed between the lower and intermediate level sensors, the smallest of these volumes is designed to measure the flow rate of unproductive oil wells. The prototype device is more progressive than the analog device due to its

slightly greater adaptability to work with wells of different productivity.

However, the main disadvantage of this device is that it also does not fully take into account the entire diversity of the range of changes in well productivity, as experience in the operation of the device in oil fields, for example, shows. Tyumen region. The use in the device of three sensors - liquid level alarms, that is, two to three calibrated measured volumes, is purely arbitrary, since wells with a wide variety of flow rates are encountered at real oil production facilities, especially during the development period. It follows that the duration of one cycle of measuring the flow rate of a particular well (from the group connected to the device) is not always optimal.

Thus, the purpose of the claimed device (otherwise, the required technical result) is to provide a well-known technical solution of higher consumer properties, namely: ensuring adaptability when switching from measuring the flow rate of one of the oil wells to measuring the flow rate of another while maintaining a given normalized measurement error, regardless their performance.

As bench and industrial tests of the claimed device and operating experience of the prototype — the device — show, the goal (technical result) is achieved by the fact that the device for measuring the oil production rate, containing, according to the prototype, a vertical metering separator tank with a side pipe for supplying it with products or any other well, with an upper branch pipe for venting associated gas and a lower branch pipe for draining the liquid, a temperature sensor in a measuring tank - separator, two sensors and - signaling, level (liquid) for limiting, from above and below, respectively, the dimensional calibrated portion (in volume) of the tank along its height, one of the same, but the intermediate hosted

between these two, a sensor-detector, two pressure sensors for measuring pressure at the upper point of the cavity of the measuring tank and for measuring pressure at the lower level of its measured calibrated part, as well as a controller with a multi-channel, by the number of sensors, input for introducing electric information signals into it of these sensors and the control output, the product supply pipeline, the associated gas discharge pipeline and the liquid phase discharge pipe, respectively, a three-way valve electrically controlled by the controller, inputs which are connected to the associated gas discharge and fluid drain pipelines, respectively, and its outlet, through a non-return valve, is connected to the flow line from the well, all three level sensors are mounted on a tube of non-magnetic material communicated by its channel with the cavity of the measuring tank below and above, respectively inside the tube there is a magnetic body with positive buoyancy, that is, a float with the properties of a permanent magnet, and level sensors-signaling devices are made in the form of the same type of reed switch .

An additional difference of the claimed device design is the placement of an intermediate sensor - level switch on a non-magnetic tube with the possibility of moving it up and down, while the sensor - level switch is equipped with an element for fixing it on the tube from unauthorized movement, and the latter is equipped with a scale - graduation in units of volume.

The required technical result is ensured by the presence of the essential features (characterizing the proposed design of the device for measuring oil production rates) of the above distinctive features, and the non-detection in the public sources of patent and technical information of equivalent technical solutions with the same properties and undoubted industrial applicability implies that the claimed object meets the criteria " utility model.

The figure shows a schematic diagram of a device for measuring the flow rate of oil wells.

The device (see figure) consists of a vertical measuring tank 1 with a supply pipe 2 and a gas and liquid outlet pipes 3 and 4, respectively. It contains a temperature sensor 5, level sensors 6 and 7, limiting the height H of the tank, bottom and top, a measured calibrated part of it, an intermediate sensor 8, a sensor 9 for measuring the hydrostatic pressure of a liquid column in the measured part of the tank, a sensor 10 for measuring the overpressure value of the overpressure in the upper gas-filled part of the tank, as well as a controller 11 with a multi-channel input 12 for electrical information signals of all sensors and a control output 13, t pipelines 14, 15 and 16 for feeding products into the tank, gas and liquid discharge, respectively, electrically controlled by the controller three-way valve 17, with inputs a and b and output c, and a check valve 18 with inputs a and b and exit "in. The tank 1 is equipped with a tube 19 of non-magnetic material, the tube ends and the channel is in communication with the cavity of the tank, a magnet float 20 is placed inside it, and three level level sensors (position 6, 7 and 8 in the figure) are installed on the tube, lower (6) of which the upper one (7) limits the calibrated measuring part of the tank by its height H, the sensor 8, intermediate relative to the other two sensors (6 and 7), is placed on the tube 19 with the possibility of its up and down movement and is equipped with an element 21 for fixing it against unauthorized movement through a tube which is provided with graduations 22 schkaloy-in volume; points A and B - pressure control (device input-output).

The device operates as follows. According to the previously known - (fio productivity test results) productivity - for a particular well, the most acceptable filling of the measuring tank corresponding to its expected flow rate is set (set), liquid 5Sh s; / s // /

Tew, that is, they involve, respectively, a specific part of the calibrated measuring volume V, based on the condition for the device to provide the minimum possible time of 1 t unit measurement cycle. The exit "to the tap 17 when preparing the device for operation is connected by a temporary pipeline (a separate position not shown) to the flow line of the well through a non-return valve 18, and the production of the well through a production supply line 13, which, as in the prototype device, is equipped with a gas pre-sampling unit ( this node is shown in the drawing, but is not indicated by a separate position), enters the measuring tank 1, where it is partially degassed due to the magnitude of the depression between the input and output of the device. The three-way electrically operated valve 17 is in a position in which the associated gas under existing overpressure in the metering tank 1 through the inlet “tap and its output” is directed back to the flow line of the well, and the liquid begins to fill the cavity of the metering tank.

When the liquid reaches the initial reference level, the controller, by the signal of one of the sensors - signaling devices (or 6, or 8), starts the controller timer and starts the countdown of the measurement time, that is, the duration of filling the corresponding measured part of the tank with liquid from one level to another is monitored and taken into account, and the hydrostatic pressure of the liquid column is determined by the value of the output current Ii of the pressure sensor 10.

When the liquid reaches the second (predetermined) reference level, the controller, by the signal of the corresponding sensor-detector, fixes the measurement time 1c and the hydrostatic pressure of the liquid column by the value of the output current b of the pressure sensor 10.

After the process of filling liquid with a predetermined volume of the measured tank (from one level to another), the three-way electrically operated valve 17, by command from the controller, switches to the position "DRAINING the liquid, and the liquid from the tank 1 through the input" a and output "to

the crane 17 is pushed back into the flow line of the well. In this case, the check valve 18 protects the device from unauthorized reverse flow of products.

The controller 11 carries out the conversion of the parameters of the state of production in the measured reservoir recorded by the controller (according to the information signals of the sensors) into the well production rate according to well-known dependencies embedded in its user-friendly software (RF certificates on the PC No 990761 and 990762), developed by the applicant’s employees earlier and improved on the filing date of this application,

In conclusion, the applicant notes that the inventive device is intended primarily for placement on any transport chassis, that is, it is manufactured in a mobile version, and is operable even with a power outage, but only for estimating flow rates. For this, the operator needs a time meter and visualization of the position of the float - magnet in one of the known ways.

.

7

SOURCES OF INFORMATION ACCEPTED ATTENTION WHEN FORMING THE PRESENT APPLICATION:

1.RF, description of utility model according to certificate No. 9478, IPC Е21В47 / 10, priority 03.17.97

2.ISSN 0132-2222. NTZ “Automation, telemechanization and communication in the oil industry. M, JSC VNIIOENG, 2001, JV 1, p. 16-18, prototype.

Claims (2)

1. A device for measuring the flow rate of oil wells, containing a vertical metering tank separator with a side nozzle for supplying well products to it, with an upper nozzle for venting associated gas and a lower nozzle for draining the fluid, a temperature sensor in the metering separator tank, two sensors - level (liquid) signaling device for restricting the bottom and top, respectively, of the measured calibrated part (in volume units) of the tank by its height, one is the same, but intermediate, placed between these dates a chime signaling device, two pressure sensors for measuring pressure at the upper point of the cavity of the measuring tank and for measuring pressure at the lower level of its measured calibrated part, as well as a controller with a multichannel, by the number of sensors, input for introducing electrical information signals of these sensors into it and a control output, product supply pipe, associated gas discharge pipe and liquid phase discharge pipe, respectively, a three-way valve electrically controlled by the controller, the inputs of which are connected to by pipelines for associated gas discharge and fluid draining, respectively, and its outlet through a non-return valve is connected to the flow line from the well, characterized in that all three level sensors are installed on a tube of non-magnetic material communicated by its channel with the cavity of the measuring tank below and above, respectively , a magnetic body with positive buoyancy is placed inside the tube, that is, a float with the properties of a permanent magnet, and level sensors-signaling devices are made in the form of the same type of reed switches . 2. The device for measuring the flow rate of oil wells according to claim 1, characterized in that the non-magnetic tube is equipped with a graduation scale in units of volume, and an intermediate additional level sensor-detector is placed on this tube with the possibility of moving up and down along it and is equipped with its element fixing against unauthorized movement.