A self-adaptive decoding method for downlink commands in a rotary steerable drilling system

A technology of rotary steerable drilling and decoding method, which is applied to the automatic control system of drilling, directional drilling, drilling equipment, etc., to achieve the effect of improving accuracy

Active Publication Date: 2022-05-03
BEIJING HENGTAI WANBO GASOLINEEUM TECH +1
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Problems solved by technology

[0005] The purpose of the present invention is to provide an adaptive decoding method for downlink instructions of a rotary steerable drilling system, so as to solve the aforementioned problems in the prior art

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  • A self-adaptive decoding method for downlink commands in a rotary steerable drilling system

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Embodiment Construction

[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not intended to limit the present invention.

[0024] like figure 1 As shown, the present invention provides an adaptive decoding method for downlink commands of a rotary steerable drilling system, including the following steps: S1. The command conversion system converts downlink commands into rotational speed signals of mud generators;

[0025] S2. The downhole control system collects the speed signal of the mud generator in real time, and filters the speed signal;

[0026] S3. The downhole control system calculates the average gradient value of the rotational speed signal filtered within a preset time, and calculates the correlation between...

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Abstract

The invention discloses an adaptive decoding method for a downlink command of a rotary steerable drilling system, which comprises a command conversion system converting the downlink command into a speed signal of a mud generator; collecting the speed signal of the mud generator, and analyzing the speed signal Perform filtering processing; judge the relationship between the correlation degree and the preset correlation degree, obtain the gradient value of the wake-up sequence in the download command within a certain time range, and automatically adjust the subsequent download sequence according to the gradient value of the wake-up sequence in the download command The thresholds h1 and h2 of the gradient value of the data sequence in the transmission command; the determined pulse sequence edge of the data sequence in the downlink command; and determine the pulse width of the data sequence according to the judgment result, and determine the downlink signal according to the pulse width. The advantages are: the wake-up sequence is detected by the correlation algorithm, the accuracy of the wake-up sequence recognition is improved, and the threshold h1 and h2 of the gradient value of the recognition data sequence are adaptively adjusted according to the gradient value of the wake-up sequence, so as to avoid decoding errors caused by unreasonable threshold setting.

Description

technical field [0001] The invention relates to the field of oil drilling, in particular to an adaptive decoding method for downlink commands of a rotary steerable drilling system. Background technique [0002] The rotary steerable drilling system is an automatic closed-loop drilling technology developed in the 1990s. Compared with the traditional drilling technology, the rotary steerable drilling technology can keep the drill bit in a continuous rotation state, so the wellbore purification effect is better and the well trajectory control accuracy is better. Higher, faster drilling speed, less chance of pipe sticking and other accidents, and stronger displacement extension capability, which is of great significance to the exploration and development of oil and gas resources, and to improve the oil and gas recovery rate of oil fields. [0003] The basic idea of ​​the rotary steerable drilling system is that the downhole system does not need to stop drilling at the same time a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B44/00E21B7/04
Inventor 高增欣
Owner BEIJING HENGTAI WANBO GASOLINEEUM TECH
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