Treatment method for slurry continuous wave signal

A processing method and slurry technology, applied in construction and other fields, can solve problems such as economic loss, signal distortion, and low transmission rate

Inactive Publication Date: 2016-05-04
SHANDONG UNIV
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Problems solved by technology

These factors inevitably cause the signal received on the ground to be distorted and contain a lot of noise, and even the signal is completely submerged in the noise, which greatly increases the difficulty of processing; at the same time, it also reduces the quality and real-time performance of the data, which has a great impact on the smooth progress of guiding drilling. Large, especially in the drilling process of some ultra-deep wells, drilling errors mean huge economic losses
[0005] At present, positive / negative pulse mode (0.5-3bits) is mainly used for the transmission of LWD signals. Compared with the continuous wave transmission mode (greater than 12bits), the transmission rate is relatively low. By improving the transmission mode, the signal transmission strength can be increased , increasing the drilling depth

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  • Treatment method for slurry continuous wave signal
  • Treatment method for slurry continuous wave signal
  • Treatment method for slurry continuous wave signal

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Embodiment

[0056] A method for processing mud fluid continuous wave signals, comprising the following steps:

[0057] 1) Establish the drilling fluid pressure wave signal model:

[0058] According to the noise analysis of the mud fluid continuous wave transmission system, the present invention adopts the composite signal model of continuous wave signal and regular drilling fluid pump noise and Gaussian white noise to construct the drilling fluid pressure wave signal model:

[0059] S(t)=λf(t)+Σp(t)+ρn(t)

[0060] Among them: λ is the transmission attenuation function of the continuous wave signal, which belongs to multiplicative interference, which reflects the characteristics of the channel, causing time delay, attenuation, etc.; f(t) is the initial downhole coded continuous wave signal; p(t) is the surface mud pump Periodic pumping noise of , including multiple harmonics; n(t) is low-intensity Gaussian white noise, distributed outside the mud pump noise frequency band;

[0061] The n...

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Abstract

The invention provides a treatment method for a slurry continuous wave signal. The signal is resolved into superposition of a series of wavelet functions by adopting wavelet transformation, the higher frequency resolution is achieved on the low frequency part, and the higher time resolution is achieved on the high frequency part. The self-adaptability to the signal is achieved, and the details of the signal can be reflected. A measurement while drilling signal is prone to be influenced by various noise in the transmission process.

Description

technical field [0001] The invention relates to a method for processing mud fluid continuous wave signals, and belongs to the technical field of oil measurement while drilling or logging while drilling. Background technique [0002] In recent years, logging-while-drilling (LWD) technology has continued to develop. Through real-time transmission of downhole measurement data, it can not only guide the drilling process in time, but also improve drilling efficiency and save costs, which is crucial to the development of the petroleum industry. Foreign logging-while-drilling technology has gradually matured. From a technical point of view, it can completely replace wireline logging technology. However, the international LWD market share and technology are absolutely monopolized by several major companies such as Schlumberger and Baker Hughes. The domestic purchase of technical services requires huge investment. [0003] Downhole signal transmission technology is one of the key t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/20
CPCE21B47/20
Inventor 李康赵书龙
Owner SHANDONG UNIV
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