Automatic Ash Supply Gas Circuit Control System and Control Method for Constant Pressure Tank

Abstract

This invention relates to the technical field of cement mixing systems for oil and gas extraction cementing trucks, and discloses an automatic ash supply gas path control system for a constant pressure tank. The system includes a constant pressure tank and a first pressure regulating valve connected to an external gas source via a gas supply pipeline. The outlet of the first pressure regulating valve is connected to a three-position control valve. The first outlet of the three-position control valve is connected to a main gas supply pipeline via a second pressure regulating valve. Several branch gas supply pipes connect the bottom of the constant pressure tank, near the ash discharge port, to the main gas supply pipeline. The second outlet of the three-position control valve is connected to the top of the constant pressure tank sequentially via a third pressure regulating valve and a first ball valve. The second outlet of the three-position control valve is also directly connected to the top of the constant pressure tank via a second ball valve. This invention also discloses a control method for the automatic ash supply gas path control system for the constant pressure tank. This invention's automatic ash supply gas path control system and control method improve the stability of the constant pressure tank gas path system, enabling the constant pressure tank to stably supply ash to the cementing equipment, and significantly improving the mixing effect of the cement slurry in the cementing equipment.

Description

Technical Field

[0001] This invention relates to the technical field of cement truck mixing systems for oil and gas extraction cementing, specifically to an automatic ash supply gas circuit control system for a constant pressure tank and its control method. Background Technology

[0002] The petrochemical industry is a pillar industry of my country's energy sector. Cementing, as a crucial process in oil and gas well extraction, is a downhole operation characterized by its wide scope, high risks, demanding requirements, and advanced technology. The quality of cementing directly impacts the extraction and lifespan of oil and gas wells, and sophisticated cementing equipment provides strong support for cementing operations in oil and gas fields and for national energy security. Although cementing technology is constantly developing and progressing, cementing equipment still faces challenges such as low equipment adaptability and difficulty in controlling the precision of cement slurry preparation. The main reason for these problems is the inability to continuously and stably supply cement ash to the cementing equipment, resulting in an inability to guarantee the density of the cement slurry.

[0003] With the current high level of national energy security attention and the increasing strategic importance of ensuring energy security, it is necessary to propose a system that can automatically provide a continuous and stable supply of cement ash to cementing equipment to meet the increasingly demanding cementing operations. As one of the main systems of the constant pressure tank, the rationality of the gas path system is particularly important. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of the above-mentioned technologies by providing an automatic ash supply gas path control system and control method for a constant pressure tank, which improves the stability of the constant pressure tank gas path system, enables the constant pressure tank to stably supply ash to the cementing equipment, and significantly improves the mixing effect of cement slurry in the cementing equipment.

[0005] To achieve the above objectives, the constant pressure tank automatic ash supply gas path control system designed in this invention includes a constant pressure tank and a first pressure regulating valve connected to an external gas source via a gas supply pipeline. The outlet of the first pressure regulating valve is connected to a three-position control valve. The first outlet of the three-position control valve is connected to a main gas supply pipe via a second pressure regulating valve. The bottom of the constant pressure tank, near the ash discharge port, is connected to the main gas supply pipe via several gas supply branch pipes. The second outlet of the three-position control valve is connected to the top of the constant pressure tank in sequence via a third pressure regulating valve and a first ball valve. The second outlet of the three-position control valve is also directly connected to the top of the constant pressure tank via a second ball valve.

[0006] Preferably, the gas supply branch pipe is equipped with a one-way valve that restricts the airflow to the constant pressure tank, preventing cement ash in the constant pressure tank from entering the gas supply pipeline and causing blockage.

[0007] Preferably, the outlets of the first ball valve and the second ball valve are equipped with one-way valves that restrict the airflow to the constant pressure tank, preventing cement ash in the constant pressure tank from entering the air supply pipeline and causing blockage.

[0008] Preferably, the third outlet of the three-position control valve is connected to an electromagnetic control valve and a manual control valve. Both the electromagnetic control valve and the manual control valve are connected to a three-way vent valve. The three-way vent valve is connected to a butterfly valve. The manual and automatic switching is realized through the three-way vent valve. By controlling the opening and closing of the butterfly valve, the switching between the ash supply pipes of the constant pressure tank is realized.

[0009] A control method for the automatic ash supply gas path control system of the constant pressure tank, wherein when the constant pressure tank is working, the first pressure regulating valve adjusts the gas pressure entering the entire system, and the three-position control valve controls the opening and closing of the gas path entering the constant pressure tank. During ash supply, the pressure of the gas entering the bottom of the constant pressure tank is controlled by the second pressure regulating valve, the first ball valve is opened, the second ball valve is closed, and the pressure of the gas entering the top of the constant pressure tank is controlled by the third pressure regulating valve. After ash supply is completed, the ash discharge port at the bottom of the constant pressure tank is opened, the gas entering the bottom of the constant pressure tank is closed by the second pressure regulating valve, the first ball valve is closed, and the second ball valve is opened for purging.

[0010] Preferably, the third outlet of the three-position control valve is connected to an electromagnetic control valve and a manual control valve. Both the electromagnetic control valve and the manual control valve are connected to a three-way vent valve. The three-way vent valve is connected to a butterfly valve. When the constant pressure tank is working, the connection of the electromagnetic control valve and the manual control valve is switched through the three-way vent valve to realize the automatic or manual control of the butterfly valve, thereby realizing the control of the opening and closing of the butterfly valves on the ash inlet, ash outlet, and bypass pipelines of the constant pressure tank.

[0011] Compared with the prior art, the present invention has the following advantages: 1. By fully mixing the cement ash and compressed air inside the constant pressure tank, and further improving the mixing effect through the floating bed air passage at the bottom of the constant pressure tank, the cement ash is vaporized, which facilitates subsequent cementing operations. 2. Through the setting and adjustment device of the gas circuit system, the internal pressure inside the constant pressure tank is always kept constant, which improves the stability of the constant pressure tank gas circuit system and enables the constant pressure tank to stably supply ash to the cementing equipment. 3. It enables manual and automatic control of the opening and closing of the butterfly valves in the constant pressure tank's ash inlet, ash outlet, and bypass pipelines. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the automatic ash supply gas circuit control system for the constant pressure tank of the present invention.

[0013] The components in the diagram are labeled as follows: 1. Constant pressure tank; 2. Gas supply pipeline; 3. First pressure regulating valve; 4. Three-position control valve; 5. Second pressure regulating valve; 6. Gas supply main pipe; 7. Gas supply branch pipe; 8. Third pressure regulating valve; 9. First ball valve; 10. Second ball valve; 11. Check valve; 12. Solenoid control valve; 13. Manual control valve; 14. Three-way air valve; 15. Butterfly valve. Detailed Implementation

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0015] like Figure 1 As shown, an automatic ash supply gas control system for a constant pressure tank includes a constant pressure tank 1 and a first pressure regulating valve 3 connected to an external gas source via a gas supply pipeline 2. The outlet of the first pressure regulating valve 3 is connected to a three-position control valve 4. The first outlet of the three-position control valve 4 is connected to a main gas supply pipe 6 via a second pressure regulating valve 5. The bottom of the constant pressure tank 1, near the ash discharge port, is connected to the main gas supply pipe 6 via four gas supply branch pipes 7. The second outlet of the three-position control valve 4 is connected to the top of the constant pressure tank 1 via a third pressure regulating valve 8 and a first ball valve 9. The second outlet of the three-position control valve 4 is also directly connected to the top of the constant pressure tank 1 via a second ball valve 10.

[0016] Among them, the gas supply branch pipe 7 is equipped with a one-way valve 11 that restricts the airflow to flow only to the constant pressure tank 1. The outlets of the first ball valve 9 and the second ball valve 10 are both equipped with one-way valves 11 that restrict the airflow to flow only to the constant pressure tank 1, so as to prevent the cement dust in the constant pressure tank 1 from entering the gas supply pipeline 2 and causing the gas supply pipeline 2 to be blocked.

[0017] In addition, such as Figure 1 As shown, the third outlet of the three-position control valve 4 is connected to a solenoid control valve 12 and a manual control valve 13. Both the solenoid control valve 12 and the manual control valve 13 are connected to a three-way air valve 14. The three-way air valve 14 is connected to a butterfly valve 15. The manual and automatic switching is realized through the three-way air valve 14. The switching between the ash supply pipes of the constant pressure tank 1 is realized by controlling the opening and closing of the butterfly valve 15.

[0018] In this embodiment, when the constant pressure tank 1 is working, the first pressure regulating valve 3 regulates the gas pressure entering the entire system, and the three-position control valve 4 controls the opening and closing of the gas path entering the constant pressure tank 1. When ash is supplied, the pressure of the gas entering the bottom of the constant pressure tank 1 is controlled by the second pressure regulating valve 5, the first ball valve 9 is opened, the second ball valve 10 is closed, and the pressure of the gas entering the top of the constant pressure tank 1 is controlled by the third pressure regulating valve 8. After the ash supply is completed, the ash discharge port at the bottom of the constant pressure tank 1 is opened, the gas entering the bottom of the constant pressure tank 1 is closed by the second pressure regulating valve 5, the first ball valve 9 is closed, and the second ball valve 10 is opened for purging.

[0019] In addition, when the constant pressure tank 1 is working, the connection between the solenoid control valve 12 and the manual control valve 13 is switched by the three-way air valve 14 to realize the automatic or manual control of the butterfly valve 15, thereby realizing the control of the opening and closing of the butterfly valve 15 on the ash inlet, ash outlet and bypass pipeline of the constant pressure tank 1.

[0020] In this embodiment, the gas pressure entering the overall gas circuit system is adjusted by the first pressure regulating valve 3, the second pressure regulating valve 5 and the third pressure regulating valve 8. The main gas supply pipe 6 supplies gas to the bottom of the constant pressure tank 1, and the first ball valve 9 supplies gas to the top of the constant pressure tank 1, blowing up the cement ash to improve the mixing effect. By adjusting the first pressure regulating valve 3, the second pressure regulating valve 5 and the third pressure regulating valve 8, the gas pressure is adjusted so that the constant pressure tank 1 always maintains a constant internal pressure, which can keep the gas supply pressure stable.

[0021] This invention relates to an automatic ash supply gas path control system and method for a constant pressure tank. By ensuring thorough mixing of cement ash and compressed air within the constant pressure tank 1, and further enhancing the mixing effect through the gas path at the bottom of the constant pressure tank 1, the cement ash is vaporized, facilitating subsequent cementing operations. Through the configuration and adjustment of the gas path system, a constant internal pressure is maintained within the constant pressure tank 1, improving the stability of the gas path system and enabling the constant pressure tank 1 to stably supply ash to the cementing equipment. The invention also allows for manual and automatic control of the opening and closing of the ash inlet, ash outlet, and bypass pipeline butterfly valve 15 of the constant pressure tank 1.

[0022] It should be noted that the above description of the technical solutions is exemplary, and this specification may be embodied in different forms and should not be construed as limiting it to the technical solutions set forth herein. Rather, providing these descriptions will ensure that the disclosure of this invention is thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Furthermore, the technical solutions of this invention are defined only by the scope of the claims.

[0023] The aspects disclosed in this specification and claims are merely examples, and therefore, this specification and claims are not limited to the details shown. In the foregoing description, detailed descriptions of relevant known functions or configurations have been omitted where it would unnecessarily obscure the focus of this specification and claims.

[0024] Finally, it should be noted that the above description is a further detailed explanation of the invention in conjunction with specific embodiments. It should not be considered that the specific implementation of the invention is limited to these descriptions. For those skilled in the art, any simple substitutions made without departing from the concept of the invention should be considered within the scope of protection of this invention. The above embodiments are merely representative examples of the invention. Obviously, the invention is not limited to the above embodiments and many variations are possible. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the invention should be considered within the scope of protection of this invention.

Claims

1. A constant pressure tank automatic ash supply gas circuit control system, comprising a constant pressure tank (1), characterized in that: It also includes a first pressure regulating valve (3) connected to an external gas source via a gas supply pipeline (2). The outlet of the first pressure regulating valve (3) is connected to a three-position control valve (4). The first outlet of the three-position control valve (4) is connected to a main gas supply pipe (6) via a second pressure regulating valve (5). The bottom of the constant pressure tank (1) near the ash discharge port is connected to the main gas supply pipe (6) via several gas supply branch pipes (7). The second outlet of the three-position control valve (4) is connected to the top of the constant pressure tank (1) via a third pressure regulating valve (8) and a first ball valve (9) in sequence. The second outlet of the three-position control valve (4) is also directly connected to the top of the constant pressure tank (1) via a second ball valve (10). The gas supply branch pipe (7) is equipped with a one-way valve (11) that restricts the airflow to flow only to the constant pressure tank (1). The outlets of the first ball valve (9) and the second ball valve (10) are both equipped with one-way valves (11) that restrict the airflow to flow only to the constant pressure tank (1). The third outlet of the three-position control valve (4) is connected to an electromagnetic control valve (12) and a manual control valve (13). The electromagnetic control valve (12) and the manual control valve (13) are both connected to a three-way air valve (14). The three-way air valve (14) is connected to a butterfly valve (15). The three-position control valve (4) uniformly distributes the gas source to the gas supply main pipe (6) connected to the first outlet, and the first ball valve (9) and the second ball valve (10) connected to the second outlet.

2. A control method for the constant pressure tank automatic ash supply gas circuit control system as described in claim 1, characterized in that: When the constant pressure tank (1) is working, the first pressure regulating valve (3) regulates the gas pressure entering the entire system, and the three-position control valve (4) controls the opening and closing of the gas path entering the constant pressure tank (1). When ash is supplied, the pressure of the gas entering the bottom of the constant pressure tank (1) is controlled by the second pressure regulating valve (5), the first ball valve (9) is opened, the second ball valve (10) is closed, and the pressure of the gas entering the top of the constant pressure tank (1) is controlled by the third pressure regulating valve (8). After the ash supply is completed, the ash discharge port at the bottom of the constant pressure tank (1) is opened, the gas entering the bottom of the constant pressure tank (1) is closed by the second pressure regulating valve (5), the first ball valve (9) is closed, the second ball valve (10) is opened, and purging is performed.

3. The control method of the constant pressure tank automatic ash supply gas circuit control system according to claim 2, characterized in that: The third outlet of the three-position control valve (4) is connected to an electromagnetic control valve (12) and a manual control valve (13). Both the electromagnetic control valve (12) and the manual control valve (13) are connected to a three-way air valve (14). The three-way air valve (14) is connected to a butterfly valve (15). When the constant pressure tank (1) is working, the connection between the electromagnetic control valve (12) and the manual control valve (13) is switched through the three-way air valve (14) to realize the automatic or manual control of the butterfly valve (15), thereby realizing the control of the opening and closing of the butterfly valve (15) on the ash inlet, ash outlet and bypass pipeline of the constant pressure tank (1).

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