CN-121978748-A - Air gun control system and control method

CN121978748ACN 121978748 ACN121978748 ACN 121978748ACN-121978748-A

Abstract

The invention provides an air gun control system which comprises a host, manifold pressure, a network switch, a deck interface unit, a deck power supply unit, a time controller and subarrays, wherein the host is connected with the manifold pressure through a serial port line and is also connected with the network switch through a network line, the deck interface unit is connected with the network switch and the deck power supply unit through a cable, the time controller is time receiving and control equipment, is connected with the network switch and is connected to the host, the subarrays are connected with the deck interface unit through a gun cable, and each subarray is designed to be an independent module and is positioned below the water surface, so that data interaction between underwater equipment and deck equipment is realized. The air gun control system provided by the invention has a modularized design, is simple in structure, and can effectively reduce the system cost and improve the operation convenience.

Inventors

CHEN HAOLIN
YU ZHENGJIE
KE YUJIE
WU DENGFU
LIU ZHAO
WEI QI

Assignees

中国石油集团东方地球物理勘探有限责任公司
中国石油天然气集团有限公司

Dates

Publication Date: 20260505
Application Date: 20251222

Claims (10)

1. An air gun control system is characterized by comprising a host, manifold pressure, a network switch, a deck interface unit, a deck power supply unit, a time controller and subarrays; The host is also connected with the network switch through a network cable and connected with each subsystem through the network switch, and issues control commands and receives back transmission data; The deck interface unit is connected with the network switch and the deck power supply unit through cables, provides interfaces for equipment in the deck power supply unit and the subarrays, modulates and demodulates long cable data signals, and performs Ethernet-VDSL communication conversion and voltage conversion on the data signals; The time controller is time receiving and controlling equipment, is connected with the network switch and is connected to the host; The subarray is connected with the deck interface unit through the gun cable, each subarray is designed into an independent module, is positioned below the water surface and is arranged on the gun hanging disc below the floating body, and the subarray realizes the data interaction of the underwater equipment and the deck equipment.
2. The air gun control system of claim 1 wherein the number of deck power units is at least one and the number of subarrays is at least one, the number of deck power units and subarrays being the same, and each deck power unit providing power to one subarray individually.
3. The air gun control system of claim 1 wherein the subarray comprises a subarray controller, an air gun controller, and an air gun, the subarray controller managing the air gun controller, the air gun controller controlling the air gun, the subarray controller establishing high precision time synchronization with the time controller via a PTP synchronization protocol.
4. The air gun control system as recited in claim 3 wherein each of said subarray controllers manages at least one air gun controller and wherein each of said air gun controllers controls at least one air gun.
5. The air gun control system as recited in claim 4 wherein each of said subarray controllers manages 8 air gun controllers and 16 air guns.
6. The air gun control system of claim 1, wherein the air gun control system further comprises navigation; the navigation is connected with the host and the time controller in a communication way; the time controller receives ignition pulses sent by navigation and forwards the ignition pulses to the subarrays, and simultaneously returns CTB pulses to navigation.
7. The air gun control system as claimed in claim 3, wherein a gun cable winch is further arranged between the deck interface unit and the subarray for winding and unwinding a gun cable, the subarray controller is connected with the gun cable winch and the air gun controller through a gun cable, the air gun controller is connected with the air gun through a gun cable, a gun cable big end of the gun cable is connected with the subarray controller, the gun cable big end is further connected with a high-pressure air pipe, and the high-pressure air pipe is positioned outside the subarray controller.
8. An air gun control method, characterized in that the method is applied to the air gun control system according to any one of the above claims 1 to 7; the method comprises a preparation stage, a gun starting stage and a data returning stage; For the preparation phase, including, S1, starting a system, namely starting a deck power supply unit, supplying power to a subarray controller and an air gun controller through a deck interface unit and a gun cable winch, then starting a time controller to receive GPS signals, performing real-time calibration, and starting manifold pressure and a host after the time calibration is completed; S2, confirming system readiness, namely, a host acquires state information from a time controller, a subarray controller and an air gun controller, and confirms that all equipment in the system is ready; for the firing phase, which includes, S3, setting construction parameters, namely, navigation transmits an excitation source number list of the construction to a host, and the host forwards the information to a time controller; s4, transmitting firing commands, namely after the ship support arrives at the construction site according to coordinates set by navigation, the navigation transmits firing commands to the time controller, and the excitation source number list and the firing commands received by the time controller are transmitted to subarray controllers and air gun controllers participating in construction after being time stamped; S5, air gun excitation, wherein an air gun controller controls the air gun to open according to the received open instruction; for the data backhaul phase, which includes, S6, data acquisition and transmission, namely after the air gun finishes the ignition action, a sensor on the air gun transmits the acquired monitoring data back to the subarray controller, and then transmits the monitoring data back to the host through the deck interface unit and the network switch; And S7, calibrating the time of the gun, namely, the host receives the returned data, calculates the time deviation of the gun according to the acquired waveform after each time of air gun excitation and returns the time deviation to the air gun controller through the subarray controller, and the air gun controller performs offset calibration in the next gun-firing action, wherein the error between the air gun excitation moment and the theoretical gun response moment after calibration is not more than 1ms.
9. The air gun control method according to claim 8, wherein the list of excitation source numbers in step S3 is a subarray controller number, an air gun controller number, and an air gun number participating in construction.
10. The air gun control method as claimed in claim 8, wherein said sensors in step S6 include hydrophones, pressure sensors, depth sensors, and gun motion sensors.

Description

Air gun control system and control method Technical Field The invention relates to the field of geophysical exploration, in particular to an air gun control system and an air gun control method applied to marine exploration. Background The marine gun control system is a system for controlling the excitation of an air gun focus on the sea, and has the main functions of completing the excitation control of the air gun focus, collecting air gun synchronous signals, near-field wavelet signals, pressure and depth data in real time and monitoring the excitation quality of the air gun focus. The current air gun control systems can be divided into two types, namely analog type and digital type according to the different system structures and data transmission modes. The control circuit and the auxiliary channel acquisition circuit of the analog air gun control system are both arranged in the instrument room of the seismic exploration ship, and the downlink control instruction and the uplink auxiliary channel data are both analog signals. The main representative products are TGN from Macha, GCS90 from Sercel, gunLink from Seamap, UK, and BigShot from RS. The digital air gun control system mainly adopts underwater distributed arrangement, an air gun control data acquisition circuit module is arranged at an underwater air gun, and the whole system can be regarded as a set of small distributed digital seismograph. The product is mainly GunLink4000 of DigiShot, seamap of the original ION company and SmartSource of Teledyne. Disclosure of Invention Accordingly, the present invention is directed to an air gun control system and an air gun control method, which can solve the problems of complicated structure, difficult operation, failure and difficult maintenance of the conventional air gun control system. The invention provides an air gun control system, which comprises a host, manifold pressure, a network switch, a deck interface unit, a deck power supply unit, a time controller and subarrays, wherein the host is connected with the manifold pressure; The host is also connected with the network switch through a network cable and connected with each subsystem through the network switch, issues control commands and receives back transmission data; The deck interface unit is connected with the network switch and the deck power supply unit through cables, provides interfaces for equipment in the deck power supply unit and subarrays, modulates and demodulates long cable data signals, and converts the data signals into Ethernet-VDSL communication and voltage conversion; the time controller is a time receiving and controlling device, is connected with the network switch and is connected to the host; the subarrays are connected with the deck interface unit through gun cables, each subarray is designed into an independent module, is positioned below the water surface and is arranged on a gun hanging disc below the floating body, so that the data interaction between the underwater equipment and the deck equipment is realized. Further, the number of the deck power supply units is at least one, the number of the subarrays is at least one, the number of the deck power supply units is the same as the number of the subarrays, and each deck power supply unit supplies power to one subarray independently. Further, the subarray comprises a subarray controller, an air gun controller and an air gun, wherein the subarray controller manages the air gun controller, the air gun controller controls the air gun, and the subarray controller establishes high-precision time synchronization with the time controller through a PTP synchronization protocol. Further, the number of air gun controllers managed by each sub-array controller is at least one, and the number of air guns controlled by each air gun controller is at least one. Further, the number of air gun controllers managed by each sub-array controller was 8, and the number of air guns controlled by each air gun controller was 16. Further, the air gun control system further comprises navigation; A communication connection is established between the navigation system and the host and between the navigation system and the time controller; The time controller receives the ignition pulse sent by the navigation and forwards the ignition pulse to the subarray, and simultaneously returns the CTB pulse to the navigation. Further, still be provided with big cable winch between deck interface unit and the subarray and be used for receiving and releasing the big cable, be connected through big cable between subarray controller and big cable winch and the air gun controller, be connected through big cable between air gun controller and the air gun, big cable big head of big cable is connected the subarray controller, and big cable big head still is connected the high-pressure gas pipe, and the high-pressure gas pipe is located the outside of subarray controller. The invention also provides an air gun control