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Channel signal-to-noise ratio self-adaptive oil and gas well wireless communication method

A technology of wireless communication and signal-to-noise ratio, applied in earthwork drilling, electrical components, wellbore/well components, etc., can solve problems such as short communication distance, inability to lower cables by gravity, limited communication rate, etc., and achieve balance The effect of extra consumption

Active Publication Date: 2022-05-31
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the traditional wired transmission method cannot be used because horizontal wells are used in the development of shale oil and gas, and the cables cannot be lowered by gravity at the corners of the horizontal wells.
The new wireless communication methods mainly include three methods: mud pulse, sound wave and electromagnetic wave: the mud pulse method can only be used for mud drilling, and the application scenarios are limited; the sound wave attenuates quickly, the communication distance is short, and the environmental noise is complex; The signal frequency is not high during communication, and the communication rate is limited

Method used

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Embodiment 1

[0039] Embodiment 1 provided by the present invention is an embodiment of a wireless communication method for oil and gas wells with adaptive channel signal-to-noise ratio provided by the present invention, combined with figure 1 It can be known that the embodiment of the wireless communication method includes:

[0040] Step 1, the downhole communication terminal sends a first signal-to-noise ratio test signal to the ground communication terminal.

[0041] In a possible embodiment, the symbols corresponding to the transmission signals of the underground communication terminal and the ground communication terminal and the ground communication terminal can be expressed as:

[0042]

[0043] in is the amplitude modulation state size of the symbol; is the center frequency of the carrier; =±1, corresponding to when the symbol frequency modulation is 1 or 0, respectively; is the symbol width; =0 or π, which is invariant over one symbol width.

[0044] In a possible emb...

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Abstract

The invention relates to a channel signal-to-noise ratio self-adaptive oil and gas well wireless communication method. The method comprises the following steps: an underground communication terminal sends a first signal-to-noise ratio test signal to a ground communication terminal; the ground communication terminal measures the signal-to-noise ratio SNR of the current communication frequency channel, and determines the highest communication center frequency available for wireless communication of the current channel according to the signal-to-noise ratio SNR; the underground communication terminal modifies the communication center frequency into the highest center frequency and sends a second signal-to-noise ratio test signal to the ground communication terminal; the ground communication terminal measures the sum of signal-to-noise ratios when the frequency information is 0 and 1; determining an available wireless communication amplitude modulation system number and an amplitude modulation peak flag bit of the current channel according to the signal-to-noise ratio sum; and the underground communication terminal modifies the communication amplitude modulation bit number and the amplitude modulation peak value to perform normal communication. The self-adaption of the signal-to-noise ratio of different channel communication environments is realized, and the communication rate is effectively improved on the basis of ensuring the signal transmission distance and the transmission precision.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a wireless communication method for oil and gas wells with adaptive channel signal-to-noise ratio. Background technique [0002] The global conventional oil and gas reserves are only enough to be exploited for another 50 years. In order to achieve the sustainable development of the oil and gas industry, unconventional oil and gas such as shale oil and gas has become the key support direction of national development. However, shale oil and gas are in a free state, widely distributed in shale interlayers, and have poor permeability, which poses new challenges to mining methods and technologies. [0003] By realizing the real-time communication between the surface and the underground, the surface staff can understand the downhole working conditions in real time, adjust the mining strategy and operation method in real time according to the underground working conditions, and cha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/08H04L27/04H04L1/00H04B17/336E21B47/12
CPCH04L27/08H04L27/04H04L1/0033H04B17/336E21B47/12Y02D30/70
Inventor 陈庆李红斌余沐阳
Owner HUAZHONG UNIV OF SCI & TECH
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