RU2604103C1 - Method of automatic control of coal-methanol well - Google Patents

Abstract

FIELD: gas industry.

SUBSTANCE: invention relates to production of methane from coal beds and can be used in development and operation of coal-methanol wells using automatic process control. According to the method the well is connected to a control and power supply module. This module includes a pump control station with a frequency converter. Said station is made with the possibilities to control the pump capacity by changing the frequency basing on the downhole sensor data and controlling the annular pressure and the gas flow rate basing on the annular space pressure sensor. Method envisages opening/closing the throttle valve with an electric drive. Well is also connected to a metering and measuring unit module. It includes a gas and a water line with a throttle valve having an electric drive and a proportional-integral-differentiating regulator - PID-regulator, a shutoff valve with an electric drive. By means of them the well is controlled. For this purpose envisaged is the use of a program of development and operation of coal-methanol wells in the form of a data array. Data array is loaded into a centralized monitoring and control system. Herewith data are transmitted with a preset by the program time intervals in the automatic mode. Automatic adjustment is carried out by transmitting a supported parameter directly to the device for generating a control signal located in the metering and measuring module, in compliance with the program of development and operation of coal-methanol wells. At critical deviations of parameters of the well operation provided is its emergency shutdown in accordance with the program settings.

EFFECT: technical result is the increase of quality and efficiency of development and operation of coal-methanol wells due to automatic maintenance of a well operation parameters as per a specified schedule, reduced cost due to elimination of manual adjustment of parameters of the well operation.

1 cl, 1 dwg

Description

The invention relates to the field of methane production from coal seams and can be used in the development and operation of methane wells using automatic process control.

A known method of operating a hydrocarbon field (RF patent No. 2453685 C1, IPC E21B 43/12, E21B 34/16, publ. 20.06.2012, bull. 17). The control processes consist in opening and closing the shut-off and control valves of the wellbore by independently supplying the working fluid to the actuators of the shut-off and control valves, as well as flare and loop valves, which are placed on pipelines in the immediate vicinity of the control cabinet, for example, on one common frame with control cabinet. The opening of the shut-off and control valves of each well is carried out in the following sequence: an underground shut-off valve, a stem gate valve, a loop gate valve, a side gate valve, and closing — in the reverse order.

The closest technical solution in technical essence is a method of controlling a gas condensate well (RF patent No. 2367784 C1, IPC E21B 43/12, E21B 33/03, published on September 20, 2009, Bulletin No. 26). The well is connected to a control station, including a pump-storage unit, a well control unit. The pump-and-accumulator installation includes a pump group and a modular-sectional power functional pneumohydroaccumulator, which are communicated via a working fluid with a high-pressure line connecting them to the well control unit. The high pressure line is connected through pressure-reducing regulators to the power lines of the functional control of the shut-off elements and the butterfly valve. The station is equipped with a logical control line, which is connected to the actuators, providing automatic passage of the team. Each moderator has a control pneumatic accumulator and a throttle adjusted for a predetermined deceleration of the flow from the control pneumatic accumulator of the working fluid.

The disadvantages of this analogue and prototype are the complexity of the design (in particular the presence of a working fluid), which accordingly increases the cost of the well development process, the inability to work on a given program.

The technical result consists in improving the quality and efficiency of the processes of development and exploitation of methane wells by automatically maintaining the parameters of the well on a given schedule, reducing the cost by eliminating manual adjustment of the parameters of the wells.

The specified technical result is achieved by the fact that in the method of automatic control of a methane-coal well, characterized in that the well is connected to a control and power supply module and a metering and measuring unit module by which the well is controlled, according to the invention, the methane-coal well is controlled using a downloadable development program and exploitation of methanol wells in the form of an array of data loaded into a centralized monitoring and control system, while yes nye transmitted with time intervals given program in an automatic mode, an automatic adjustment is carried out by transmitting the parameter maintained in accordance with the program development and exploitation of CBM wells directly on the device for generating the control signal, disposed in accounting and measurement module.

The invention is illustrated in the drawing, which shows a structural diagram of a modular piping methane wells for automatic control of a methane well.

Automated management of a methane-coal well is carried out using the module of the metering and measurement unit 1 and the control and power supply module 2 (application for utility model No. 2015131800, priority date 07/31/2015).

The main components of metering and measurement module 1: gas 3 and water 4 lines, gas filter, butterfly valve with electric actuator 5 and built-in PID controller, shut-off valve with electric actuator, flow meters-counters of liquid 6 and gas 7, pressure transmitters 8 installed before and after the throttle valve 5, thermal converter 9, gas analyzer 10, flame detector.

The main components of the control and power supply module 2: automation and communication cabinet 11 (including equipment for converting and transmitting signals to the control room, performing control, signaling and protection algorithms), pump control station 12 with a frequency converter, power distribution cabinet 13, uninterruptible power supply 14, providing guaranteed power supply to control, telemetry and communication nodes.

Automatic management of a methane-well is carried out using a downloadable program for the development and operation of methane-wells (for example, according to the program for the development of methane-wells in accordance with the application for invention No. 20155120318, priority date 05/29/2015) in the form of an array of data into a centralized monitoring and control system for the entire system (e.g. SCADA). Data is transmitted at programmed intervals in automatic mode. Using the control and power supply module 2, the pump capacity is adjusted based on the downhole sensor data by changing the frequency. Using the control and power supply module 2, the annular pressure and, therefore, the gas flow rate are also adjusted based on the annular pressure sensor data by opening / closing the throttle valve with electric actuator 5. Automatic adjustment is carried out by transmitting the supported parameter directly to the device for generating the control signal (for example, PID-regulator) in accordance with the program of development and operation of methanol wells.

If it is physically impossible to maintain the parameters specified by the development program, the system signals the need for work at the well. In case of critical deviations of the equipment operation parameters, an automatic emergency shutdown is performed in accordance with the settings table.

At the same time, the development and operation of the well are carried out automatically according to the specified development program and, therefore, the human factor is excluded, which increases the quality and efficiency of the development and operation of methane-wells. Eliminating the need to adjust well parameters manually or remotely reduces the labor costs of gas field personnel (drivers, operators, engineers).

Claims (1)

A method for automatically controlling a methane-gas well, characterized in that the well is connected to a control and power supply module including a pump control station with a frequency converter, configured to control pump performance by changing the frequency based on downhole sensor data and adjusting annular pressure and gas flow rate based on the sensor annulus pressure by opening / closing the throttle valve with electric drive, and the unit and metering and measurement, including a gas and water line with an electric throttle valve and a proportional-integral-differentiating regulator - a PID controller, an electric actuator-shutoff valve, which control the well, characterized in that the methane-coal well is controlled by programs for the development and operation of methanol wells in the form of an array of data loaded into a centralized monitoring and control system, while the data is transmitted with specified prog with ammma time intervals in automatic mode, automatic adjustment is carried out by transmitting the supported parameter directly to the device for generating a control signal located in the metering and measuring module, in accordance with the program for the development and operation of methane-wells, and for critical deviations of the parameters of the well’s operation, its emergency shutdown in accordance with the program settings.

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