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Data transmission method for underground single-core long cable communication

A data transmission method and long cable technology, which is applied in earthwork drilling, wellbore/well components, measurement, etc., can solve problems such as multiple application of components, complex circuits, and inability to meet oilfield application requirements, and achieve high-reliability communication, The effect of small size and stable communication performance

Active Publication Date: 2015-01-28
BC P INC CHINA NAT PETROLEUM CORP +1
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AI Technical Summary

Problems solved by technology

There is no finished communication integrated circuit with a high temperature resistance exceeding 150°C on the market. Based on the existing signal communication method, the self-made modem is used in parts. The circuit is too complicated, and there are many components used, which cannot meet the requirements of oilfield applications.

Method used

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  • Data transmission method for underground single-core long cable communication
  • Data transmission method for underground single-core long cable communication

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Embodiment Construction

[0016] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0017] According to the data transmission method for downhole single-core long cable communication according to the embodiment of the present invention, the encoding rule adopted is to use 8 different frequencies to be divided into two groups A and B to encode the data, each group is 4, The combination of a frequency in group A and a frequency in group B represents a specific code, which forms a total of 0~9, decimal point, odd verification code, even verification code, negative symbol of frequency out of range, start-stop control command and backup There are 16 codes in total;

[0018] When transmitting data, first send a specific waveform as the synchronization start co...

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Abstract

The invention discloses a data transmission method for underground single-core long cable communication. An adopted coding rule comprises that 8 different frequencies are divided into a group A and a group B to perform data coding; each group comprises four frequencies; one frequency in the group A and one frequency in the group B are combined to represent a special code; totally 16 codes comprising 0 to 9, decimal points, uneven number verification codes, even number verification codes, negative value symbols with the frequencies exceeding a range, starting and stopping control commands and spare codes are formed; during data transmission, firstly a special wave form is sent to be used as a signal synchronous starting mode; then codes are sent according to the coding rule; each code comprises two frequency bands corresponding to the coding rule; each frequency band comprises a plurality of wave forms with the same quantities in multiple periods. The method is high in transmission efficiency and reliability, and a modem adopted in the method is small in size, low in power consumption, stable in performance and convenient to maintain.

Description

technical field [0001] The invention relates to the technical field of oil and gas well testing, in particular to a data transmission method for downhole single-core long cable communication. Background technique [0002] At present, the surface-downhole communication in oil and gas field testing operations mostly adopts single-core armored cable transmission. This method is low in cost, but affected by the harsh environment such as transmission medium, manufacturing process and underground high temperature and high pressure, there are problems such as slow transmission speed, small amount of information, signal attenuation, and large distortion, and the attenuation and phase shift of the cable transmission channel Increases sharply with increasing signal frequency and cable length. [0003] The existing downhole instruments that rely on cable communication generally have problems such as slow speed and unreliable data transmission, which bring obstacles to subsequent data ...

Claims

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Application Information

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IPC IPC(8): E21B47/12
CPCE21B47/12
Inventor 吴秋来高硕贾琳珊杜成良朱礼斌贾文义
Owner BC P INC CHINA NAT PETROLEUM CORP
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