Remote intelligent metering sulfur and acid removal method and device

Abstract

The invention relates to the technical field of oil and gas well testing ground equipment, in particular to a remote intelligent metering sulfur and acid removal method and device, which comprises the following steps: automatically detecting the concentration and PH value of hydrogen sulfide, and acquiring the concentration and PH value of hydrogen sulfide at a metering tank opening and in a tank in real time; under the condition that the hydrogen sulfide concentration is higher than 10 PPM or the residual acid concentration is smaller than 7, the sulfur removal agent metering pump and the strong alkali solution metering pump are automatically started, the displacement of the metering pumps is automatically increased or decreased according to the hydrogen sulfide concentration of a metering tank opening and the PH value in the tank which are collected in real time, the concentration of hydrogen sulfide at the metering tank opening is smaller than 10 PPM, and the PH value of returned liquid in the tank is increased to be close to 7. According to the method, operation can be timely and stable, unattended operation of a metering area is achieved, and the risk caused by traditional sulfur removal and acid reduction is effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas well testing ground equipment, and is a remote intelligent metering desulfurization and deacidification method and device. Background Art

[0002] In the process of oil and gas resource exploration, development, and evaluation, well testing is a means to discover the existence of oil and gas reservoirs, and is a key link in oil and gas exploration and reservoir understanding. The ground test metering process is a key process for obtaining oil and gas data. Generally, the wellhead has high pressure, high production, and local sulfur content, which puts higher requirements on the metering process.

[0003] Currently, the treatment of hydrogen sulfide and residual acid in oil and water during well testing is mainly manual operation, which has operation risks such as human error, incomplete desulfurization, unqualified neutralization of residual acid, easy burns to personnel, and poisoning of personnel by sulfur-containing products. Summary of the Invention

[0004] The present invention provides a remote intelligent metering desulfurization and deacidification method and device, which overcomes the above-mentioned deficiencies of the prior art and can effectively solve the problem of operation risks in the treatment of hydrogen sulfide and residual acid during well testing when manual operation is used.

[0005] One technical solution of the present invention is achieved by the following measures: A remote intelligent metering desulfurization and deacidification method, comprising the following steps: Automatically detect the hydrogen sulfide concentration and pH value, and collect the hydrogen sulfide concentration and pH value at the metering tank mouth and inside the tank in real time; When the hydrogen sulfide concentration is higher than 10 PPM or the residual acid concentration is less than 7, automatically turn on the desulfurizer metering pump and the strong base solution metering pump, and automatically increase or decrease the displacement of the metering pump according to the size of the hydrogen sulfide concentration at the metering tank mouth and the pH value inside the tank collected in real time, so that the hydrogen sulfide concentration at the metering tank mouth is less than 10 PPM, and the pH value of the returned liquid inside the tank is increased to be close to 7.

[0006] The following is a further optimization and / or improvement of the above-mentioned technical solution of the invention: The hydrogen sulfide concentration and pH value at the metering tank mouth and inside the tank can be collected in real time through an on-line fixed hydrogen sulfide sensor and pH sensor.

[0007] Remote manual intervention adjustment can be performed according to the well conditions on site to quickly increase or decrease the displacement of the metering pump, so as to accelerate the speed of desulfurization and neutralization of residual acid.

[0008] It can be set with manual and automatic modes for desulfurization and neutralizing residual acid; in the manual mode, the user operates the start and stop of each metering pump separately and adjusts the electric displacement of each metering pump; in the automatic mode, the user sets the upper limit of hydrogen sulfide in the metering tank and the pH value of the residual acid, and compiles a prefabricated program. The program automatically controls the start, stop and displacement of the desulfurizer metering pump and the strong alkali solution metering pump according to the hydrogen sulfide concentration at the tank opening and the pH value of the residual acid in the tank.

[0009] When it is detected that the hydrogen sulfide concentration in the metering tank is less than 10 PPM and the pH value of the residual acid is between 6 and 7, it stops working.

[0010] The second technical solution of the present invention is achieved by the following measures: A remote intelligent metering desulfurization and deacidification device, including: A sensor module, which is used to collect sensor signals of the hydrogen sulfide concentration and pH value at the metering tank opening and in the tank in real time, and send the sensor signals to the control module; A control module, which is used to receive the sensor signals sent by the sensor module, process the sensor signals and convert them into the hydrogen sulfide concentration and pH value, and send control commands to the execution module according to the magnitudes of the hydrogen sulfide concentration and pH value; An execution module, which is used to receive the control commands sent by the control module and control the magnitude of the hydrogen sulfide concentration and the pH value in the tank by starting and stopping the metering pump and controlling the displacement of the metering pump.

[0011] The following is a further optimization or / and improvement of the second technical solution of the above invention: The above sensor module may include a hydrogen sulfide sensor and a pH value sensor, and the hydrogen sulfide sensor and the pH value sensor are respectively electrically connected to the control module; wherein, the hydrogen sulfide sensor is used to collect the hydrogen sulfide concentration in real time, and the pH value sensor is used to collect the pH value in real time.

[0012] A manual switch and an automatic switch may also be provided, and the manual switch and the automatic switch are respectively electrically connected to the control module and are used for switching between the manual mode and the automatic mode.

[0013] The present invention can achieve the connection between the metering pump and each device, collect data, analyze data, automatically start and stop the electric metering pump, automatically adjust the displacement of the metering pump or manually remotely intervene in the displacement of the metering pump, so as to reduce the hydrogen sulfide concentration at the metering tank opening to reach the safe operation concentration or below, and the residual acid liquid in the tank is neutralized and the PH is close to 7. The present invention can make the operation timely and stable, realize unattended operation in the metering area, and effectively solve the risks brought by traditional desulfurization and acid reduction. The present invention forms a set of remote intelligent real-time online desulfurization and acid removal process, and solves the problems of desulfurization and acid removal process for high-sulfur wells and residual acid after acid fracturing of oil and gas wells. In the present invention, the hydrogen sulfide concentration and the liquid PH value are accurately measured, especially applicable to high-sulfur wells and acid fracturing wells, reducing the safety risks and operation intensity of on-site operators and improving the process control accuracy. The present invention has very important significance in meeting market demands, seizing technological high points, etc., and effectively solves the risks brought by traditional desulfurization and acid reduction operations in the metering area. Through the research on the automatic control process of the metering area of high-sulfur wells and acid fracturing wells, the present invention develops a remote intelligent metering desulfurization and acid removal device and conducts on-site application tests, and good test results are obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The Figure 1 schematic diagram of the principle of the embodiment of the present invention.

[0015] The codes in the drawings are respectively: HS is a hydrogen sulfide sensor, PH is a PH value sensor, DQX1 is a power interface box, DQX2 is an explosion-proof touch remote control box, DQX3 is an in-pry control box, JDQZ is a relay group, JLB is a metering pump, LX is a material tank, K1 is a sewage outlet, K2 is an antifoaming agent outlet, K3 is a desulfurizing agent outlet, K4 is a PH neutralizing agent outlet, K5 is a water injection port, G1 is a mixing agent tank, G2 is a desulfurizing agent tank, G3 is an antifoaming agent tank, and JLG is a metering tank. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The present invention is not limited by the following embodiments, and the specific implementation manners can be determined according to the technical solutions of the present invention and the actual situation.

[0017] The present invention will be further described below in conjunction with the embodiments: Embodiment 1: As shown in the Figure 1 drawing, the remote intelligent metering desulfurization and acid removal method includes the following steps: Automatically detect the hydrogen sulfide concentration and PH value, and collect the hydrogen sulfide concentration and PH value at the metering tank opening and inside the tank in real time; in the embodiment of the present invention, the hydrogen sulfide concentration and PH value at the metering tank opening and inside the tank are collected in real time through an online fixed hydrogen sulfide sensor and a PH value sensor.

[0018] When the hydrogen sulfide concentration is higher than 10 PPM or the residual acid concentration is less than 7, the desulfurizer metering pump and the strong alkali solution metering pump are automatically started. According to the hydrogen sulfide concentration at the metering tank outlet and the pH value in the tank collected in real time, the displacement of the metering pump is automatically increased or decreased, so that the hydrogen sulfide concentration at the metering tank outlet is less than 10 PPM, and the pH value of the returned liquid in the tank is increased to be close to 7.

[0019] The embodiment of the present invention can realize the connection between the metering pump and each device, collect data, analyze data, automatically start and stop the electric metering pump, automatically adjust the displacement of the metering pump or manually remotely intervene in the displacement of the metering pump, so as to reduce the hydrogen sulfide concentration at the metering tank outlet to reach the safe operation concentration or below, and the residual acid liquid in the tank is neutralized and the pH is close to 7. The embodiment of the present invention can make the operation timely and stable, realize unattended operation in the metering area, and effectively solve the risks brought by traditional desulfurization and acid reduction. The embodiment of the present invention forms a set of remote intelligent real-time online desulfurization and acid removal process, and solves the desulfurization and acid removal process problems of high-sulfur wells and residual acid after acid fracturing of oil and gas wells. In the embodiment of the present invention, the hydrogen sulfide concentration and the liquid pH value are accurately measured, which is especially suitable for high-sulfur wells and acid fracturing wells, reduces the safety risks and operation intensity of on-site operators, and improves the process control accuracy. The embodiment of the present invention has very important significance in meeting market demands and seizing technological high points, and effectively solves the risks brought by traditional desulfurization and acid reduction operations in the metering area.

[0020] Example 2: As shown in the appendix Figure 1 As shown, in the remote intelligent metering desulfurization and acid removal method, remote manual intervention adjustment can be carried out according to the well conditions on site when necessary. For example, using the electric displacement control device of the electric metering pump, the displacement of the metering pump can be quickly increased or decreased to accelerate the desulfurization and neutralization of residual acid. There are manual and automatic modes for desulfurization and neutralization of residual acid; in the manual mode, the user can separately operate the start and stop of each metering pump and adjust the electric displacement of each metering pump on the software; in the automatic mode, the user can set the upper limit of hydrogen sulfide in the metering tank (such as 10 PPM) and the residual acid pH value such as pH value = 5, and compile a prefabricated program. The program automatically controls the start and stop and displacement of the desulfurizer metering pump and the strong alkali solution metering pump according to the hydrogen sulfide concentration at the tank outlet and the residual acid pH value in the tank. In the embodiment of the present invention, when it is detected that the hydrogen sulfide concentration in the metering tank is less than 10 PPM and the residual acid pH value is between 6 and 7, the device stops working.

[0021] Example 3: As shown in the appendix Figure 1 As shown, the remote intelligent metering desulfurization and acid removal device includes: A sensor module for real-time collection of sensor signals of hydrogen sulfide concentration and pH value at the tank opening and inside the metering tank, and transmission of the sensor signals to the control module; in an embodiment of the present invention, the sensor module includes a hydrogen sulfide sensor and a pH sensor, and the hydrogen sulfide sensor and the pH sensor are electrically connected to the control module respectively; wherein, the hydrogen sulfide sensor is used for real-time collection of hydrogen sulfide concentration, and the pH sensor is used for real-time collection of pH value; A control module for receiving the sensor signals sent by the sensor module, processing the sensor signals and converting them into hydrogen sulfide concentration and pH value, and sending control commands to the execution module according to the magnitudes of the hydrogen sulfide concentration and pH value; An execution module for receiving the control commands sent by the control module and controlling the magnitudes of the hydrogen sulfide concentration and the pH value inside the tank by starting and stopping the metering pump and controlling the displacement of the metering pump. In an embodiment of the present invention, when the hydrogen sulfide concentration is higher than 10 PPM or the residual acid concentration is less than 7, the device automatically turns on the desulfurizer metering pump and the strong alkali solution metering pump, and automatically increases or decreases the displacement of the metering pump according to the magnitudes of the hydrogen sulfide concentration collected in real time at the tank opening of the metering tank and the pH value inside the tank, so that the hydrogen sulfide concentration at the tank opening of the metering tank is less than 10 PPM, and the pH value of the returned liquid inside the tank is increased to be close to 7. Specifically, the execution module includes several relays, and the relays are electrically connected to the control module. The control module can control the energization and de-energization of the relays, and the energization and de-energization of the relays control the closing and opening of the electric control switches, so that the metering pumps and electric ball valves of each material in the device can perform start and stop actions.

[0022] During operation, the power interface box outputs power or control power to the explosion-proof touch remote control box, the control box inside the skid, and the power sources of the device (such as metering pumps, electric ball valves, etc.). Then, the hydrogen sulfide sensor and the pH sensor provide corresponding signal information to the control module inside the explosion-proof touch remote control box. After obtaining the corresponding sensor signals, the control module controls the energization and de-energization of the corresponding relays in the relay group inside the explosion-proof touch remote control box. The energization and de-energization of the relays control the closing and opening of the electric control switches inside the control box inside the skid, so that the metering pumps and electric ball valves of each material in the device can perform start and stop actions. A program for pre-compiling the logical relationship between each power and opening / closing node and the sensor signals of the whole set of devices can be stored in the control module, enabling the whole set of devices to form an intelligent linkage system with the control module as the "brain", the sensors as the "senses", and the metering pumps and electric ball valves as the "hand and foot actions".

[0023] In the embodiments of the present invention, a monitoring sensor for the real-time online hydrogen sulfide content and the residual acid pH value is used to collect the hydrogen sulfide concentration and pH value in the tank area in real time. The obtained hydrogen sulfide concentration and pH data are converted from analog to digital and then connected to the ground test integrated system by means of a field industrial wireless local area network. The data is transmitted to the integrated system for real-time display, enabling operations such as automatic start and stop of metering pumps and automatic adjustment of displacement. The data acquisition terminal and the central control data acquisition control system are used for remote control or pre-programming for intelligent control, realizing the operation of desulfurization and acid reduction in the metering tank.

[0024] The embodiments of the present invention can realize the connection between the metering pump and each device, collect data, analyze data, automatically start and stop the electric metering pump, automatically adjust the displacement of the metering pump or manually remotely intervene in the displacement of the metering pump, so as to reduce the hydrogen sulfide concentration at the metering tank outlet to reach the safe operation concentration or below, and the residual acid liquid in the tank is neutralized and the pH approaches 7. The embodiments of the present invention can make the operation timely and stable, realize unattended operation in the metering area, and effectively solve the risks brought by traditional desulfurization and acid reduction. In the embodiments of the present invention, the hydrogen sulfide concentration and the liquid pH value are accurately measured, especially suitable for high-sulfur wells and acid fracturing wells, reducing the safety risks and operation intensity of on-site operators and improving the process control accuracy. The embodiments of the present invention are of great significance in meeting market demands and seizing technological high points, and effectively solve the risks brought by traditional desulfurization and acid reduction operations in the metering area. Through the research on the automation control process of the metering area of high-sulfur wells and acid fracturing wells, the embodiments of the present invention have developed a remote intelligent metering desulfurization and deacidification device and carried out on-site application tests, achieving good test results.

[0025] Example 4: As shown in the appendix Figure 1 In the remote intelligent metering desulfurization and deacidification device, the control module can be an existing ground test integrated system or a PLC controller, or other existing modular controllers. During use, a real-time online hydrogen sulfide sensor and a pH sensor are used to collect the hydrogen sulfide concentration and pH value in the tank area in real time, and are connected to the ground test integrated system by means of a field industrial wireless local area network. The data is transmitted to the integrated system for real-time display, and the metering pump is remotely controlled by the central control screen or intelligently controlled by pre-programming, realizing remote desulfurization and acid reduction operations.

[0026] Example 5: As shown in the appendix Figure 1As shown, in the remote intelligent metering desulfurization and deacidification device, a manual switch and an automatic switch may also be provided. The manual switch and the automatic switch are respectively electrically connected to the control module and are used for switching between the manual mode and the automatic mode. Among them, in the manual mode, the user can separately operate the start and stop of each metering pump on the software and adjust the electric displacement of each metering pump; among them, in the automatic mode, the user can set the upper limit of hydrogen sulfide in the metering tank and the pH value of the residual acid, compile a prefabricated program, and the program automatically controls the start and stop and displacement of the desulfurizing agent metering pump and the strong alkali solution metering pump according to the hydrogen sulfide concentration at the tank opening and the pH value of the residual acid in the tank.

[0027] The above technical features constitute an embodiment of the present invention, which has strong adaptability and implementation effects. Non-essential technical features can be increased or decreased according to actual needs to meet the requirements of different situations.

Claims

1. A remote intelligent metering method for desulfurization and deacidification, characterized in that it includes the following steps: Automatically detect the hydrogen sulfide concentration and pH value, and collect in real time the hydrogen sulfide concentration and pH value at the mouth and inside the metering tank; When the hydrogen sulfide concentration is higher than 10 PPM or the residual acid concentration is less than 7, automatically turn on the desulfurizer metering pump and the strong alkali solution metering pump, and automatically increase or decrease the displacement of the metering pump according to the size of the hydrogen sulfide concentration at the mouth of the metering tank and the pH value inside the tank, so that the hydrogen sulfide concentration at the mouth of the metering tank is less than 10 PPM, and the pH value of the returned liquid inside the tank is increased to be close to 7.

2. The remote intelligent metering method for desulfurization and deacidification according to claim 1, characterized in that The hydrogen sulfide concentration and pH value at the mouth and inside the metering tank are collected in real time by an on-line fixed hydrogen sulfide sensor and pH sensor.

3. The remote intelligent metering method for desulfurization and deacidification according to claim 1 or 2, characterized in that Remote manual intervention adjustment is carried out according to the on-site well conditions to quickly increase or decrease the displacement of the metering pump, so as to accelerate the speed of desulfurization and neutralization of residual acid.

4. The remote intelligent metering method for desulfurization and deacidification according to claim 1 or 2, characterized in that There are manual and automatic modes for desulfurization and neutralization of residual acid; in the manual mode, the user operates the start and stop of each metering pump separately and adjusts the electric displacement of each metering pump; in the automatic mode, the user sets the upper limit of hydrogen sulfide in the metering tank and the pH value of residual acid, and compiles a prefabricated program, and the program automatically controls the start and stop and displacement of the desulfurizer metering pump and the strong alkali solution metering pump according to the hydrogen sulfide concentration at the tank mouth and the pH value of residual acid inside the tank.

5. The remote intelligent metering method for desulfurization and deacidification according to claim 3, characterized in that There are manual and automatic modes for desulfurization and neutralization of residual acid; in the manual mode, the user operates the start and stop of each metering pump separately and adjusts the electric displacement of each metering pump; in the automatic mode, the user sets the upper limit of hydrogen sulfide in the metering tank and the pH value of residual acid, and compiles a prefabricated program, and the program automatically controls the start and stop and displacement of the desulfurizer metering pump and the strong alkali solution metering pump according to the hydrogen sulfide concentration at the tank mouth and the pH value of residual acid inside the tank.

6. The remote intelligent metering method for desulfurization and deacidification according to claim 1 or 2 or 5, characterized in that When it is detected that the hydrogen sulfide concentration in the metering tank is less than 10 PPM and the pH value of residual acid is between 6 and 7, stop working.

7. The remote intelligent metering method for desulfurization and deacidification according to claim 3, characterized in that When it is detected that the hydrogen sulfide concentration in the metering tank is less than 10 PPM and the pH value of residual acid is between 6 and 7, stop working.

8. A remote intelligent metering device for desulfurization and deacidification, characterized in that it includes: A sensor module for collecting in real time the sensor signals of the hydrogen sulfide concentration and pH value at the mouth and inside the metering tank, and sending the sensor signals to the control module; A control module for receiving the sensor signals sent by the sensor module, processing the sensor signals and converting them into hydrogen sulfide concentration and pH value, and sending control commands to the execution module according to the size of the hydrogen sulfide concentration and pH value; An execution module, configured to receive control commands sent by a control module, and control the concentration of hydrogen sulfide and the pH value in a tank by starting and stopping a metering pump and controlling the displacement of the metering pump.

9. The remote intelligent metering desulfurization and deacidification device according to claim 8, wherein the sensor module includes a hydrogen sulfide sensor and a pH sensor, and the hydrogen sulfide sensor and the pH sensor are respectively electrically connected to the control module; wherein, the hydrogen sulfide sensor is used to collect the hydrogen sulfide concentration in real time, and the pH sensor is used to collect the pH value in real time.

10. The remote intelligent metering desulfurization and deacidification device according to claim 8 or 9, wherein it is further provided with a manual switch and an automatic switch, and the manual switch and the automatic switch are respectively electrically connected to the control module, and are used for switching between manual mode and automatic mode.

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