SU746086A1 - Gas well yield automatic regulator system - Google Patents

Description

The invention relates to the technique of automatic control and regulation and can be used in the gas industry in the gas and gas condensate fields. The well-known pneumatic automatic well performance control system consisting of n (by the number of wells) gas flow controllers, n pneumatic actuators installed on the gas well plugs, and one pressure regulator whose inlet is connected to the gas collection manifold and the output - to each flow control valve. When the pressure in the gas collector changes, the pressure regulator automatically changes the setpoint for all flow controllers. The latter, affecting their actuators, change the performance of gas wells until the pressure in the gas collector is restored to a given ij value. The described system has the following drawbacks: the overloading of gas wells is not excluded with an increase in gas extraction from the field, or in the emergency or planned shutdown of some wells. Overloading gas wells leads to violation of the rules for exploitation of the subsoil, intermittently watering the wells or destroying the bottom zone, which ultimately requires additional costs for repairing wells or leads to a subsequent decrease in their productivity; Inevitably, there is a violation of the technological regime of gas extraction and drying when the pneumatic feeding system disappears. In gas fields, the automation pneumatic systems are supplied from air drying installations, which include compressors, air dryers, receivers. With the disappearance of electricity (which is not so rare, especially in fields with individual power plants), the compressors are stopped, and the air pressure in the return springs gradually decreases. AT; The dry period, especially in the fields located in the regions of the Extreme North, is condensation and freezing of moisture in the pipelines.

Which also leads to the disappearance of (Pneumatic feeding automation systems. This causes a complete closure or opening (depending on the type) of the actuators.

In both cases, the technological mode of gas extraction and drying is disrupted, which manifests itself either in the reloading of wells and the deterioration of the quality of gas preparation, or in a decrease in gas production.

Also known is an automatic system for regulating the productivity of gas wells in the well, which prevents gas wells from overloading with increasing gas extraction from the field or shutting down some wells. An automatic pressure regulator is connected to one of the inputs of the flow rate regulators (to the channel of the reference) through the signal limit blocks, the input of which is connected to the gas collector to LLECE .toru 21 ..

When changing the gas withdrawal from the field or the gas inflow into the gas collector, the pressure at the latter deviates from the specified value. This deviation is perceived by the pressure regulator, which, through the limiting blocks, changes the setting of the flow controllers. The latter affect the actuators for as long as the well productivity becomes equal to the specified value.

The limiting blocks are configured in such a way that the signal from the pressure regulator passes through them to the flow regulators without changing only when the magnitude of this signal does not exceed the value corresponding to the maximum allowable performance corresponding to the value. If the output signal of the pressure regulator rises above the permissible value, the output of the limiting units will remain constant values of the signals corresponding to the maximum allowable values of the performance of the corresponding wells. These performance values will support automatic flow controllers. Thus, the described system provides automatic regulation of the performance of gas wells, preventing their overload.

However, this system, as well as the one described above, has a second disadvantage: with the disappearance of pneumatic feeding, its ekkaz leads to a violation of the technological regime of extraction and drying of gas.

The purpose of the invention is to prevent the violation of the technological regime of the gas field during the disappearance of the pneumatic feeding system.

The goal is achieved. We note that the automatic system for regulating the performance of gas wells is equipped with pneumatic valves (by the number of gas wells) and pressure switches with inputs connected to: an air supply line, and pressure switch outputs connected to the inputs of the corresponding pneumatic valves, while the outputs Flow controllers are connected to the actuators through pneumatic valves.

The drawing shows a schematic diagram of the proposed system.

The automatic system for regulating the performance of gas wells includes a line of 1 pneumatic supply; Mounted on the stub 2 of each gas well 3 a sensor 4 and a gas flow controller 5 connected to the actuator 6 through a pneumatic valve 7 and to the output of the corresponding signal limiting unit 6 to which the output of the pressure regulator 9 connected to the gas collector 10 is connected. System contains n (by the number of gas wells) PN 7, connected to n pressure switch 11; accordingly, each pressure switch 11 is connected with its input to the line 1 of pneumo-infusion. Pressure switch 11 consists of two main parts: a membrane unit 12 and two pneumatic contacts 13 and 14 in the form of a nozzle-damper. The membrane unit 12 consists of three membranes connected by a rigid center and forming four chambers A, B, C, and G. The spring 15 in chamber A creates a constant force on the membrane unit 12. Chamber A is connected to the atmosphere, and chamber G is with nozzle 14 and pnevmorele exit. Chamber B and nozzle 13 are connected to pneumatic feed line 1.

The pneumatic valve 7 consists of three chambers A, B, and B, separated by two membranes, forming a membrane block 16, the rigid center of which serves as a shutter of the discharge nozzle 17. Chamber B has a spring 18 that creates a constant force on the membrane block 16.

The chamber A is connected to the outlet pery-j of the flow torus 5, and the nozzle 17 is connected to the actuator b.

The automatic system works 5 as follows. .

Claims (1)

1. Automation and computational equipment on gas pipelines Islam abroad. Ser. Gas business. M., VNIIOENG, 1966. 2; Taranenko V.F. Automatic control of low-temperature gas separation. M., VNIIEGAZPROM, 1973 (prototype). ts