Logging remote transmission system using discrete multi-tone modulation mode
A discrete multi-audio, modulation method technology, applied in the field of remote transmission systems, can solve the problems of inability to work, inability to meet the requirements of large data volume, and reduction of system data rate.
Active Publication Date: 2011-08-03
中油测井技术服务有限责任公司
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Problems solved by technology
The disadvantage of this technology is: once the carrier frequency is interfered, the data rate of the system will be greatly reduced, or even unable to work
However, this transmission data rate still cannot meet the requirements of large data volumes
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[0032] figure 1 A schematic diagram of the logging operation of the downhole tool in the well. Downhole instruments collect various data downhole, and these data are transmitted to the ground through the remote transmission system, and the ground system records, displays, analyzes and processes these data. In addition to completing the data communication between the downhole instrument and the surface system, the remote transmission system also transmits power to the downhole instrument. In the logging system, the remote transmission system acts as a bridge connecting the information and electric energy between the downhole instrument and the surface system.
[0033] The seven-core cable is usually used in oil well logging, and its mechanical strength is very good. figure 2 The section and construction material of the conventional seven-core cable are given. We generally use a combination of seven-core cable cores to transmit signals. These combinations are called transmis...
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The invention is a well logging remote transmission system with high-performance, which is used for data transmission between a down-hole logger and a ground data collecting system and to deliver power to the down-hole logger. The system is composed of a ground transceiver, a down-hole transceiver, a well logging cable, a digital signal processing unit and solidifying communication software. The ground transceiver and the down-hole transceiver which respectively transmit and receive multi-tone (DMT) signal are an all duplex system used for seven cores or single core cable, can be used in one or more transmission mode of the seven cores cable. The communication protocol is derived from the standard ADSL protocol. The frequency band of communication channels is divided into pluralities of adjacent sub- frequency band and each sub- frequency band is assigned with an audio frequency. The system self-adaptively determines the bit number of the information carried by each audio frequency. The bit numbers allocated in each audio dependent on the signal / noise ratio of the audio frequency band, the higher the signal / noise ratio is, the more the bit numbers of the audio are.
Description
1. Technical field: [0001] The invention belongs to the field of well logging, and its technology relates to the data transmission between the well logging downhole instrument and the surface system and the transmission of the power required by the downhole instrument. This communication and power supply facility is usually called a remote transmission system. 2. Background technology: [0002] Logging is the use of downhole instruments to perform various measurements on the characteristics of the formation. Logging system is the general term for logging facilities, which includes ground system, remote transmission system and downhole instruments. The core of the surface system is the logging computer. Downhole instruments include resistivity, acoustic, radioactive and other types. Downhole instruments collect various data downhole, and these data are transmitted to the ground through the remote transmission system, and the ground system records, displays, analyzes and pro...
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IPC IPC(8): G08C19/00G08C19/16G08C19/30G08C19/02
Inventor 肖加奇陈文轩
Owner 中油测井技术服务有限责任公司