The Process of High-Data-Rate Mud Pulse Signal in Logging While Drilling System

Liang, Yuhua; Ji, Xiaodong; Anzong, Li; Li, Chuanwei; Dai, Zhiping; Ma, Li

doi:10.1155/2020/3207087

Cited by 10 publications

(9 citation statements)

References 6 publications

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“…Therefore, by encoding and modulating the original data, not only the data transmission efficiency is improved but the anti-noise performance of the system is also greatly enhanced. When selecting specific coding and modulation formats, it is important to consider the characteristics of the processed signal with less DC component, more stability and reliability, and ease of detection and recognition at the surface [26].…”

Section: Coding and Modulation Of The Mud Pulse Signalmentioning

confidence: 99%

A Review of Communication Technologies in Mud Pulse Telemetry Systems

Li,

2023

Electronics

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Mastering real-time and accurate downhole information is crucial for ensuring drilling safety, improving drilling efficiency, and maximizing economic benefits. In recent years, logging while drilling (LWD) technologies, represented by mud pulse telemetry (MPT), achieved significant success. However, they still face challenges such as a large amount of downhole information conflicting with low information transmission rates, severe channel distortion, strong noise interference, and weak surface receiving signals. Therefore, this review collects and updates the papers, patents, and conference articles in the relevant field over the past ten years. Starting from the basic structure of communication systems, the downhole signal coding and modulation technologies of the MPT system are discussed. The attenuation reflection brought by the mud channel and various noise interferences in the system are described. The surface noise cancellation, channel equalization, synchronization, and decoding are studied in detail. By analyzing the theoretical principles, development breakthroughs, and relevant challenges that can improve the development of LWD technologies, this review aims to assist researchers in the field in obtaining the latest references and strategies.

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Section: Coding and Modulation Of The Mud Pulse Signalmentioning

confidence: 99%

A Review of Communication Technologies in Mud Pulse Telemetry Systems

Li,

2023

Electronics

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“…(2) The coding should be error-resilient. Due to the interference of noise, the channel has a high bit error rate when using mud pulse to transmit data (Hu et al, 2019;Liang et al, 2020;Qu et al, 2018;Tu et al, 2014). Therefore, when designing compression algorithm, it is required to have a certain bit error resistance.…”

Section: The Analysis Of Probability Model Of Lwd Datamentioning

confidence: 99%

A lossless compression method for logging data while drilling

Song

Lian²,

Liu³

et al. 2021

Systems Science & Control Engineering

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Mud pulse transmission technology is widely used in logging while drilling (LWD), while its low data transmission efficiency has restricted the development of LWD technology for a long time. In order to improve the equivalent data transmission efficiency of LWD system, a data compression method, namely, Frame Prediction Huffman Coding (FPHC) with a group of frames, is proposed in this paper. Several factors including the data accuracy, the need for real-time transmission, and the existence of transmission errors are comprehensively considered in the proposed method. Through the probability statistical analysis of LWD data, it is proved that the data have a relatively stable probability distribution after predictive coding. In addition, the Huffman code table generated from predictive coding is universally applicable to other LWD data. Through data compression experiments on logging data, it is verified that the proposed method has higher compression efficiency compared with Huffman coding, Lempel-Ziv-Welch algorithm, adaptive Huffman coding and adaptive arithmetic coding. This lossless compression method will have a good application prospect because of its ability to prevent error diffusion, simple implementation and easy to be embedded in down-hole equipment.

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“…In addition, the settling of the heavy components of the drilling slurry causes an increase in hydraulic resistance when it is pumped from the vessel's cargo tank to the drilling platform, and in some cases can lead to damage to the cargo pumps. Further removal of sediment from cargo tanks is carried out mechanically and requires additional energy and time, and the first and second increase financial costs and reduces the economic performance of PSV [4,5].…”

Section: Introductionmentioning

confidence: 99%

Control and regulation of the density of technical fluids during their transportation by sea specialized vessels

Maryanov

2022

TAPR

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The object of research is the process of transporting drilling slurry through specialized marine vessels of the Platform Supply Vessels class. The subject of research is the sedimentation stability of the drilling slurry along the height of the cargo tank, which is proposed to be defined as a relative change in vertical density near the surface and bottom of the cargo tank. The studies were carried out on a specialized sea vessel with a displacement of 7320 tons. The design of the vessel provided for the reception and transportation of drilling slurry in four cargo tanks located on the port and starboard sides of the vessel. It has been experimentally established that during the 48-hour transportation, the density of the drilling slurry in the bottom part increases to 19.7 %; decrease in density on the surface – up to 7.8 %; decrease in the sedimentation resistance of the drilling slurry along the depth of the cargo tank – up to 29.85 %. A variant of modernization of the drilling slurry transportation system by installing additional circulation pumps providing forced circulation of the drilling slurry between cargo tanks is proposed. By using programmable microcontrollers (performing turning on/off the circulation pumps), it is possible to provide the following conditions for transporting the drilling fluid: an increase in the density of the drilling fluid in the bottom part up to 0.3 %; decrease in density on the surface – up to 0.25 %; decrease in the sedimentation resistance of the drilling slurry along the depth of the cargo tank – up to 8.01 %. It has been experimentally established that the creation of additional circulation and automatic support of the sedimentation resistance of the drilling fluid in the range of 2–7 % contributes to: – increasing the relative performance of cargo pumps from 38–55 % to 92–96 %; – reducing the time of pumping drilling slurry from cargo tanks to the drilling platform from 7.1 to 3.2 hours; – maintaining the technical condition of equipment, pipelines and elements of the drilling slurry transportation and pumping system.

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The Process of High-Data-Rate Mud Pulse Signal in Logging While Drilling System

Cited by 10 publications

References 6 publications

A Review of Communication Technologies in Mud Pulse Telemetry Systems

A Review of Communication Technologies in Mud Pulse Telemetry Systems

A lossless compression method for logging data while drilling

Control and regulation of the density of technical fluids during their transportation by sea specialized vessels

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