Adaptive method of measuring and controlling flow rate of a group of oil wells and device for its implementation

 

The invention relates to the operation of wells and can be used in the measurement and control of flow rate. The objective of the invention is the possibility of assessing the technical state of the system "drive deep well pump" in the production process. The method consists in alternately, for a given program, measuring the amount of liquid of each well that has passed through the meter during a fixed time interval, with conversion to daily productivity. What's new is that when measuring the flow rate of one of the wells of the group for the rest of the wells operate individual measurement of the hydraulic capacity of the downhole pump and the power consumption of the actuator, in this case, if the ratio is changed to the value ofK0.1 K, where K is a predetermined numerical value for each well, the well with such a deviation coefficient To connect to an extraordinary measure its flow rate. The device comprises a vertical measuring tank with side inlet to feed him well production, with an upper outlet for discharge of the associated gas released and the lower pipe to drain the fluid into a collecting reservoir neftepetchorsk. The device also includes electrical sensors for monitoring parameters in a volumetric tank, and the controller with multi-channel according to the number of sensors inlet for introducing electrical information signals of these sensors and control outputs, electrically operated controller toggle wells and three-way valve, the inputs of which are connected with pipelines associated gas and drain the fluid, respectively, and its output through a check valve connected to the precast header field. The device has a unit of measure of active power, the inputs of which are connected with the supply tyres drives deep pumps controlled oil wells, and outputs connected to information inputs of the controller. 2 S. p. f-crystals, 1 Il.

The invention relates to the field of measurement and control of oil wells and can be used in information-measuring systems of production, transport of oil, gas and water.

The known method [1] measuring the productivity of wells by measuring the average consumption values for appropriately chosen time, in order to increase measurement accuracy by establishing time the Oia discretely increasing time intervals, comparing each subsequent value with the previous and complete measurement of the achievement difference between two adjacent mean square deviation set point.

In this way, the optimal time measurement of the flow rate of each well from a group of wells come with iterations (method of successive approximations, starting a measurement with a known flow rate of least time. According to the results of several measurements are averaged measured value and its standard deviationThe obtained value oficompared with the specified value average standard deviation of the resulting averagey. Wheny1measurement of the well is terminated and the signal on connection the next hole. Wheny<1increasing the measurement time and again calculates the arithmetic mean of the measured valueand his expectation2. Next, after dostate (not given here), and the system again has two outcomes: either the measurement ends, or is added to increase the measurement time. If you increase the measurement time to set new values ofand only ifwhere n is the total number of intervalstnthe measure, included in a specified duration of measurement equal to tn=t+ntnissued the obtained value of xn.

Known, and a device measuring the performance of wells that implements the method [1], comprising a hydraulic switch, flow meter, the power information transmission unit of the calculation of the total consumption for a given time of measurement, the unit of calculating the average flow for this time of measure, unit of issue accurate average flow generator unit time intervals, the block forming the duration of the current tests, the evaluation unit average standard deviation of the arithmetic mean value of the flow rate, the block storing the previous value of the mean-square deviation and calculating the difference between adjacent values of the mean square deviations, the control unit mode measurement method and device for measuring apparent and the selected criteria will be effective if a sufficiently large number of measurements at each step of iterations. When a significant number of wells connected to alternately measure the flow rate of the i-th well, this method leads to unreasonably long time measurement of the flow rate of a group of wells. And when you consider that to get a true xiwill require a number of measurements to determine the daily production rate of each well, the application of this method is hardly an urgent need.

There is a method of measuring the production wells, implemented in the device [2, 3] and consists in measuring the weight suspended through the force sensor sealed cylindrical measuring vessel, periodically filled products alternately plug wells, also known as indirect method of control of the flow rate on the power consumption of the actuator is implemented by the device [4].

The most significant drawback of the method implemented by the device [2, 3], is a hard program survey wells to measure the output.

The disadvantage of this device [2, 3] is its instrument saturation and complexity of the design execution.

The closest technical solution (PR is bit of oil wells. The known device is the prototype includes a vertical cylindrical separation vessel with the preliminary site selection gas line entering her production wells, three-way valve with actuator three-pointer liquid level, a valve, an electrical temperature sensor, an electric pressure sensor, the controller and the switch wells.

The method implemented by the device-prototype [5] , is alternately filling for a given program measuring containers separated products of oil wells and the mass flow measurement at a known time filling capacity volume measuring capacity and pressure drop of the liquid column between the lower and upper levels, the cutoff level sensor.

The disadvantages of the known technical solutions (method and device) measurement and control of flow of the group of oil wells are: hard preconceived program sequence and the duration (time) of the survey when measuring the rate of production of each group of wells, not taking into account the dynamics of change in flow for each well in the intervals between the individual measurement cycles.

Thus, the purpose of the claimed objects (otherwise required of technicist by giving agility while ensuring that in addition, evaluation of the technical state of the system "drive deep well pump".

The required technical result in the claimed method, according to the prototype method, which consists in alternately, for a given program, measuring the amount of liquid of each well that has passed through the meter during a fixed time interval, with conversion to daily performance, is achieved by the fact that when measuring the flow rate of one of the wells of the group for the rest of the wells operate individual measurement of the hydraulic capacity of the downhole pump and the power consumption of the actuator, if their attitude is changed by the value of0.1 (where the source To a pre-defined individually for each well), well with such a deviation of the ratio of the capacity to connect to an extraordinary measure its flow rate.

Show poster and industrial tests of the claimed device and the operating experience of the prototype device, the required technical result is achieved in that the device for measuring the flow rate of oil wells, according to the prototype contains a vertical dimensional reservoir lower pipe to drain the fluid, the temperature sensor in the measuring tank, sensors, respectively, the maximum and minimum allowable liquid level therein, the sensor of the difference of the hydrostatic pressure in the tank, the gauge pressure at the top cavity of the tank, and the controller with multi-channel, number of sensors, inlet for introducing electrical information signals of these sensors and control outputs, the supply pipeline products pipeline diversion and associated gas pipeline drain the fluid, respectively, of electrically controlled by the controller switch wells and three-way valve, the inputs of which are connected with pipelines associated gas and drain the fluid, respectively, and its output is designed to connect through a non-return valve, to the assembled collector field, equipped with advanced unit of measure active power, the inputs of which are connected with the supply tyres drives deep pumps controlled oil wells, and outputs connected to information inputs of the controller.

The required technical result is ensured by the presence of essential features (describing the proposed method and implements its oestrous in public sources of patent and technical information equivalent technical solutions with the same properties implies conformity to the declared objects of the criteria of the invention.

The drawing shows a schematic diagram of a device that implements an adaptive method for measuring and controlling flow rate of a group of oil wells.

The device consists of a vertical measuring tank 1 with the inlet pipe 2 and, accordingly, the discharge gas and the liquid branch pipes 3 and 4; it also contains the sensor 5 temperature sensors 6 and 7 the minimum and maximum in the tank liquid level sensor 8 to the difference of hydrostatic pressure in the measuring part of the tank, i.e. the pressure difference on its height H is filled with liquid up to the maximum level, the gauge 9 gauge pressure at the top cavity of the tank, and the controller 10 with a multi-channel input 11 and output 12 and 13, the pipes 14, 15 and 16 to supply in tank production, gas exhaust, and drain, respectively, of electrically controlled by the controller switch 17 wells and three-way valve 18. In addition, the device has a unit of measure of active power 19, inputs 20 are connected with the supply tyres drives deep pumps controlled oil wells connected to information inputs of the controller.

The device operates as follows. Through the controller, the Jin measuring flow rate.

Products one of the wells through the switch 17 and the pipeline 14 feed products (which can be fitted with a node for pre-selection of gas; this node is not shown), is fed into the measuring vessel 1, where the separation of liquids and associated gas. Three-way electrically-controlled valve 18 is in the position in which the associated gas under pressure into the measuring vessel 1 is directed into a collecting reservoir, and the liquid fills the cavity of the measuring tank.

At achievement level Iminthe controller, the signal of the sensor 6 that detects the hydrostatic pressure P1of the liquid column in the vessel by the magnitude of the current I1of the differential pressure sensor, and starts measuring time t1.

When the level of fluid Inmaxthe controller, the sensor signal 7, records the measurement time and the hydrostatic pressure of the liquid column P2the value of the output current I2.

After the process of filling the cavity of the measuring tank levelminto the level of Themaxthree-way electrically-controlled valve 18 upon command from the controller shifts to drain the fluid, and the fluid begins to be forced out of markerclusterer by command of the controller.

Recalculations fixed by the controller in a volumetric tank options in the value of production are carried out according to known dependencies.

When installed between the sensors of the lower and upper intermediate levels (not shown) of the level sensors is the possibility to change the volume of the measuring vessel, taking into account the different performance measured wells.

Simultaneously with the alternating of the survey and measurement of the flow rate of the production wells in the controller continuously calculates the current value of capacity ratios For each of the measured borehole defined by the formulawhere K - coefficient taking into account the efficiency of the electric pump, deep well pump and hydraulic efficiency of the pump; NHYDR- hydraulic power developed deep pump; Nneed to change the- consumption of electric active power; Pn(or N) is a differential pressure on the pump (in pressure units or in meters of liquid column respectively; Q is the flow rate of the pumped fluid, kg/m3; g - acceleration of gravity in m/s

In the process of survey wells current value To be compared with its numerical value (for each well), ODA is edno (control) measuring the flow rate of a particular well and the result of the parallel measurements of the consumed electric power controller adjusts the savings account of extracted products and provides additionally, the opportunity for timely detection of deviations in the operation of the pumping unit as a whole.

Thus, the proposed method and device realizing it combines the principle of the adaptive measurement of the rate of production wells and monitoring of the technical state of the system "electric pump".

The set of essential features (including distinctive) declare adaptive method for measuring and controlling flow rate of a group of oil wells and device for its implementation achieving the desired technical result meets the criteria of "invention" and is subject to the protection of the security document (patent) of the Russian Federation in accordance with the request of the applicant.

SOURCES OF INFORMATION USED IN THE COMPILATION OF DESCRIPTIONS OF THE PROPOSED INVENTIONS 1. The USSR and.with. 751977, CL E 21 In 47/10, 1976.

2. RF patent 2059067, M CL6E 21 IN 47/10, 1993.

3. Installation mesoamericana transportable "ASMA-T-03-180-300A", 40100.00.00.000. Inter-regional joint stock company "Nefteavtomatika" (Ufa), Seraphim pilot plant automation and telemechanics, 2000.

4. Cricke C. O. Analyzer flow deep well pumping wells DT-1 automation and teleautomation of the oil industry the value of oil wells. NTE automation, program and communication in the oil industry", 1-2, 2001, S. 16-18, prototype.


Claims

1. Adaptive method of measuring and controlling flow rate of a group of oil wells, which consists in alternately for a given program measuring the amount of liquid of each well that has passed through the meter during a fixed time interval, with conversion to daily productivity, characterized in that when measuring the flow rate of one of the wells of the group for the rest of the wells operate individual measurement of the hydraulic capacity of the downhole pump and the power consumption of the electric drive, while if the ratio is changed to the value ofK0.1 K (where K is a predetermined numerical value for each well), well with this deviation coefficient To connect to an extraordinary measure its flow rate.

2. Device for measuring and control of oil wells, comprising a vertical measuring tank side branch pipe for feeding the output of one or the other well, with the upper outlet for discharge of the associated gas released and the lower pipe drain jidkosti.pered, the maximum and minimum fluid levels, the difference between the hydrostatic pressure in this tank is filled with liquid up to the maximum level, gauge pressure at the top cavity of the tank, and the controller with multi-channel according to the number of sensors inlet for introducing electrical information signals of these sensors and control outputs, the supply pipeline products pipeline diversion and associated gas pipeline drain the fluid, respectively, of electrically controlled by the controller switch wells and three-way valve, the inputs of which are connected with pipelines associated gas and drain the fluid, respectively, and its output through a check valve connected to the precast header field, characterized in that it is provided with a unit of measure of active power, the inputs of which are connected with the supply tyres drives deep pumps controlled oil wells, and outputs connected to information inputs of the controller.

 

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