Download instruction self-adaptive decoding method of rotary steering 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: 2019-05-21
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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  • Download instruction self-adaptive decoding method of rotary steering 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] Such as 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 betw...

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Abstract

The invention discloses a download instruction self-adaptive decoding method of a rotary steering drilling system. The method comprises the steps of: converting a download instruction into a rotatingspeed signal of a mud generator by an instruction conversion system; acquiring the rotating speed signal of the mud generator, and filtering the rotating speed signal; judging a size relation betweena relevancy and a preset relevancy to obtain a gradient value of a wake-up sequence in a download instruction within a certain time range, and automatically adjusting thresholds h1 and h2 of a data sequence gradient value in a subsequent download instruction according to the gradient value of the wake-up sequence in the download instruction; determining a pulse sequence edge of a data sequence inthe download instruction; and determining the pulse width of the data sequence according to the judgment result, and determining a download signal according to the pulse width. The method has the advantages that the wake-up sequence is detected through related algorithms, the recognition accuracy of the wake-up sequence is improved, the thresholds h1 and h2 of the gradient value of the recognitiondata sequence are adaptively adjusted according to the gradient value of the wake-up sequence, and decoding errors caused by unreasonable threshold setting are avoided.

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 Applications(China)
IPC IPC(8): E21B44/00E21B7/04
Inventor 高增欣
Owner BEIJING HENGTAI WANBO GASOLINEEUM TECH
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