An overpressure alarm and automatic shutdown device for a drilling pump

Abstract

The present invention discloses a drilling pump overpressure alarm automatic stop device, including a drilling pump clutch air supply pipeline and a drilling pump discharge manifold, wherein the drilling pump clutch air supply pipeline includes an air source, a normally closed air relay, a quick air release valve and a drilling pump clutch connected in sequence to form an air circuit, an air source, a reversing valve and a normally open air relay connected in sequence to form a control air circuit of the normally closed air relay, an air source, a pressure regulating valve, a dual-purpose air relay, a one-way valve and a button valve connected in sequence to form a control air circuit of the normally open air relay, a whistle is arranged on the air circuit between the dual-purpose air relay and the one-way valve, and the drilling pump discharge manifold is connected to a pressure transmitter sensor to form a control liquid circuit of the dual-purpose air relay. The present invention adopts a dual-purpose air relay differential pressure control mode, and controls the drilling pump control source by the action generated by the pressure difference between the oil pressure of the pressure transmitter sensor and the air source pressure, so as to realize automatic alarm for high pressure and automatic stop of the drilling pump.

Description

Technical Field

[0001] The invention relates to a safety protection device for drilling pump equipment. Background Art

[0002] As an important part of the drilling fluid circulation system, the drilling pump provides power for the drilling fluid. With the development of drilling and the use of new speed-up tools, drilling pumps are further moving towards high power and high pump pressure, and the requirements for the reliability and safety of drilling pumps are becoming higher and higher. The long-term operation of drilling pumps under high pump pressure brings increasing safety risks, and the safety protection of pump equipment is becoming more and more important. Summary of the invention

[0003] The purpose of the present invention is to provide a drilling pump overpressure alarm and automatic stop device which triggers an alarm and controls the drilling pump to stop when the drilling pump discharges liquid overpressure by relying on the pressure of the drilling pump discharge liquid itself.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: A drilling pump overpressure alarm automatic stop device, comprising a drilling pump clutch air supply pipeline and a drilling pump discharge manifold, the drilling pump clutch air supply pipeline comprising an air source, a normally closed air relay, a quick air release valve and a drilling pump clutch connected in sequence to form an air circuit, and also comprising a pressure transmitter sensor, a dual-purpose air relay, a pressure regulating valve, a one-way valve, a button valve, a normally open air relay and a reversing valve, the air source, the reversing valve and the normally open air relay are connected in sequence and connected to the control port of the normally closed air relay to form a control air circuit of the normally closed air relay, the air source, the pressure regulating valve, the dual-purpose air relay, the one-way valve and the button valve are connected in sequence and connected to the control port of the normally open air relay to form a control air circuit of the normally open air relay, a whistle is arranged on the air circuit between the dual-purpose air relay and the one-way valve, the drilling pump discharge manifold is connected to the pressure transmitter sensor and then connected to the control port of the dual-purpose air relay to form a control liquid circuit of the dual-purpose air relay.

[0005] In order to facilitate observation of the pressure of the drilling fluid output by the drilling pump, a pressure gauge is connected to the drilling pump discharge manifold.

[0006] For the convenience of control, a switch valve is arranged between the gas source and the pressure regulating valve on the control gas circuit of the normally open gas relay.

[0007] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention adopts a dual-purpose air relay differential pressure control mode, and controls the drilling pump control source by the effect of the pressure difference between the oil pressure of the pressure transmitter sensor and the air source pressure, so as to realize automatic alarm for high pressure and automatic stop of the drilling pump. This device eliminates the environmental pollution caused by the shear pin type safety valve and the difficulty in resuming operation after stopping the pump. After the device automatically stops the pump due to overpressure, the operation of the drilling pump can be restored in a short time according to needs. The drilling pump can be stopped quickly after overpressure. The first-level protection of the drilling pump is changed to two-level protection, which improves the reliability and safety of the pump operation. According to the expected pressure, the pump stop pressure value can be adjusted in advance to reduce engineering accidents and reduce economic losses. The drilling pump can be quickly resumed after stopping the pump due to overpressure, thereby reducing engineering accidents caused by stopping the pump for too long. The protection device adopts air circuit control, which is safe and reliable to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a flow chart of the present invention.

[0009] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0010] 1. Drilling pump discharge manifold, 2. Pressure transmitter sensor, 3. Dual-purpose air relay, 4. Pressure regulating valve, 5. Switch valve, 6. Air source, 7. Whistle, 8. Check valve, 9. Push button valve, 10. Normally open air relay, 11. Reversing valve, 12. Normally closed air relay, 13. Quick release valve, 14. Drilling pump clutch, 15. Pressure gauge. DETAILED DESCRIPTION

[0011] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0012] As shown in FIG1 , this specific embodiment includes a drilling pump discharge manifold 1, a pressure transmitter sensor 2, a dual-purpose air relay 3, a pressure regulating valve 4, a switch valve 5, an air source 6, a whistle 7, a check valve 8, a button valve 9, a normally open air relay 10, a reversing valve 11, a normally closed air relay 12, a quick air release valve 13 and a drilling pump clutch 14. The drilling pump clutch 14 is used to control the drilling pump.

[0013] The gas source 6, normally closed relay air valve 12, quick exhaust valve 13 and the drilling pump clutch 14 are successively connected to form the air supply pipeline of the drilling pump clutch 14. The gas source 6, reversing valve 11, and normally open relay air valve 10 are successively connected and accessed to the control port of the normally closed relay air valve 12 to form the control air circuit of the normally closed relay air valve 12. The gas source 6, switch valve 5, pressure regulating valve 4, dual-purpose relay air valve 3, check valve 8, and push button valve 9 are successively connected and accessed to the control port of the normally open relay air valve 10 to form the control air circuit of the normally open relay air valve 10. A siren 7 is arranged on the air circuit between the dual-purpose relay air valve 3 and the check valve 8. The drilling pump discharge manifold 1 is connected to the pressure transmitting sensor 2 and then connected to the control port of the dual-purpose relay air valve 3 to form the control liquid circuit of the dual-purpose relay air valve 3. A pressure gauge 15 is connected to the drilling pump discharge manifold 1.

[0014] The pressure transmitting sensor 2 is used to convert the high-pressure hydraulic signal of the drilling fluid output by the drilling pump into a low-pressure hydraulic signal. This pressure transmitting sensor is a piston-type pressure ratio sensor, and its pressure transmission ratio is 36:1, and it supplies the control end K of the dual-purpose relay air valve 3. When the hydraulic pressure at the control end is higher than the set pressure at the gas source end A, the spool of the dual-purpose relay air valve 3 acts, and the compressed gas at the gas source end is transported from the output end P to the siren 7 to achieve an alarm. At the same time, the gas passes through the check valve 8 and the push button valve 9 and enters the control end of the normally open relay air valve 10, causing the normally open relay air valve 10 to close, cutting off the compressed air transported to the control end of the normally closed relay air valve 12 through the reversing valve 11, causing the normally closed relay air valve 12 to close, and when the gas in the airbag of the drilling pump clutch 14 flows backward through the quick exhaust valve 13, the spool of the quick exhaust valve 13 is pushed, and the exhaust port of the quick exhaust valve 13 is opened for air release. After the drilling pump clutch 14 is deflated, the power of the drilling pump is cut off and the operation stops, thus realizing automatic pump shutdown under overpressure.

[0015] After the pump stops, the check valve 8 automatically locks the gas in the pipeline from the check valve 8 to the control end of the normally open relay air valve 10, so that the spool of the normally open relay air valve 10 cannot be automatically reset. When the overpressure fault is eliminated, the locked gas is released by operating the push button valve 9, so that the spool of the normally open relay air valve 10 is automatically reset, the control air circuit of the normally closed relay air valve 12 is opened, the normally closed relay air valve 12 is opened, the air supply air circuit of the drilling pump clutch 14 is opened, the air supply to the drilling pump clutch 14 is restored, and the drilling pump resumes operation. The installation of this device does not affect the function of the original safety valve of the drilling pump. It only needs to set the pump shutdown pressure lower than the shear pin pressure value of the safety valve during construction, so that the primary insurance becomes a two-stage insurance and makes the operation of the drilling pump safer and more reliable.

[0016] The gas source end of the dual-purpose relay air valve 3 is connected to the gas source after being regulated by the pressure regulating valve 4. The function of the pressure regulating valve 4 is to set the gas pressure value supplied to the dual-purpose relay 3 for overpressure pump shutdown. When the hydraulic pressure at the control end of the dual-purpose relay 3 is higher than the set pressure at the gas source end A, the spool of the dual-purpose relay air valve 3 acts, and the compressed gas at the gas source end is transported from the output end P to the siren 7 to achieve an alarm.

[0017] In this specific embodiment: the model of the dual-purpose gas relay 3 is QF506, the model of the pressure regulating valve 4 is TIR1020-1, the model of the switch valve 5 is G404.B, the model of the siren 7 is QF533, the model of the check valve 8 is CV-0.6, the model of the push-button valve 9 is 23R1-L8, the model of the normally open gas relay 10 is 8096, the model of the reversing valve 11 is QF510, the model of the normally closed gas relay 12 is 509, and the model of the quick exhaust valve 13 is KF514C. The above components are all prior art but are not limited to using the above models.

[0018] The push-button valve 9 is a valve with three ports, an outlet, an inlet, and an exhaust port. Under normal conditions, the inlet and the outlet are connected, and neither the inlet and the outlet nor the exhaust port is connected. When the button is pressed, the outlet is connected to the exhaust port.

[0019] The quick exhaust valve 13 is also a valve with three ports, an outlet, an inlet, and an exhaust port. Under normal conditions, the inlet and the outlet are connected, and neither the inlet and the outlet nor the exhaust port is connected. When there is a reverse flow, the intake pressure at the outlet will push the valve core to move, making the outlet connected to the exhaust port.

[0020] The reversing valve 11 can adopt a two-position three-way reversing valve, including an air inlet and two air outlets. The air inlet and one air outlet are respectively connected to the air source 6 and the normally open gas relay 10, and the other air outlet is used for the air source 6 to exhaust and release air.

[0021] In the description of this specification, the description referring to terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials, or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0022] The above-disclosed preferred embodiments of the present invention are only used to help illustrate the present invention. The preferred embodiments do not elaborate on all the details, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the present invention, so that those skilled in the relevant technical field can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A drilling pump overpressure alarm and automatic shutdown device, comprising a drilling pump clutch air supply pipeline and a drilling pump discharge manifold. The drilling pump clutch air supply pipeline includes a gas source, a normally closed relay air valve, a quick exhaust valve, and a drilling pump clutch that are sequentially connected to form an air path. It is characterized in that: It also includes a pressure transmitter, a dual-purpose air relay, a pressure regulating valve, a one-way valve, a button valve, a normally open air relay and a reversing valve. The air source, the reversing valve and the normally open air relay are connected in sequence and connected to the control port of the normally closed air relay to form a control air circuit of the normally closed air relay. The air source, the pressure regulating valve, the dual-purpose air relay, the one-way valve and the button valve are connected in sequence and connected to the control port of the normally open air relay to form a control air circuit of the normally open air relay. A whistle is provided on the air circuit between the dual-purpose air relay and the one-way valve. The drilling pump discharge manifold is connected to the pressure transmitter and then to the control port of the dual-purpose air relay to form a control liquid circuit of the dual-purpose air relay. The reversing valve is a two-position three-way reversing valve, including an air inlet and two air outlets. The air inlet and one air outlet are respectively connected to the air source and the normally open air relay, and the other air outlet is used for emptying and venting the air source.

2. The drilling pump overpressure alarm and automatic shutdown device according to claim 1, characterized in that: The drilling pump discharge manifold is connected with a pressure gauge.

3. The drilling pump overpressure alarm and automatic shutdown device according to claim 1 or 2, characterized in that: A switch valve is arranged between the gas source and the pressure regulating valve on the control gas circuit of the normally open gas relay.

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