Pipeline Communication Research Articles

Research on Internal Parameter Filtering of Natural Gas Pipeline under Duty Cycle Transmission Mechanism

In recent years, with the continuous growth of China's long-distance oil and gas pipeline network, wireless communication network applications have become more and more extensive with the continuous promotion of intelligent oilfield construction, while the energy-saving problem in the process of information transmission has become increasingly prominent. In order to ensure the sustainable development of China's oil and gas industry, low-power wireless transmission has become a basic requirement for the current intelligent oil and gas pipeline communication construction. For the monitoring of pipeline operating conditions, pressure and flow rate values are important parameters. If the accuracy and comprehensiveness of pipeline operation data can be ensured simultaneously under an energy-efficient transmission mechanism, it will provide strong support for the green and safe operation of pipelines. Therefore, in this paper, a recursive filtering study is conducted for natural gas gathering pipeline flow system under duty cycle transmission mechanism to complete the reliable monitoring of pipeline fluid transportation status.

Research and application of substation cable trench inspection robot communication system

The substation cable trench inspection robot is mainly used to inspect the high-voltage cables in the underground cable trench of the substation, so as to find various hidden dangers in time. However, due to serious electromagnetic interference in the cable trench and no communication network underground, the environment is more complicated. Aiming at the complex environment in the cable trench, this paper designs a WLAN-based cable trench inspection robot communication program, combining WLAN with directional antennas, and relaying through relay routing, so that the communication between the robot and the PC is divided into pipeline communication and ground communication Two parts. At the same time, the communication hardware, software, and protocol are designed based on the B/S architecture, which effectively improves the communication distance. Through field verification, the packet loss rate of the communication system proposed in the thesis is less than 0.5‰, the communication is stable, and the communication task of the robot in the cable trench of the substation can be completed well.

Management ofCommunication System in Pipeline IndustryBased on OLP Technology

In order to effectively improve the fault self-healing ability of pipeline communication system and reduce the events of communication interruption caused by fiber break or performance degradation of optical line, this paper introduces the basic principle, system composition working mode and technical requirements of OLP technology. The OLP system is firstly introduced into the relay section of long-distance pipeline to build the standby route with the spare optical fiber as material. When the in-service route is broken or the performance of optical fiber is reduced, the OLP system can automatically switch to the standby route within 50 ms to ensure the communication transmission service be uninterrupted, and even no error code alarm. Through engineering test in pipeline industry, the operability of OLP technology applied to the pipeline communication system is verified. Using the real-time monitoring data of optical cable through OLP system, we can analyze the evolution trend of optical cable line quality, precontrol in advance, and improve the level of communication management.

ИССЛЕДОВАНИЕ ВЛИЯНИЯ СТРУКТУРЫ ПОТОКА НА КОЭФФИЦИЕНТ ГИДРАВЛИЧЕСКОГО СОПРОТИВЛЕНИЯ

During the movement along a closed circuit, the working flow has to overcome a certain hydraulic resistance. Any pipeline communication has not only straight sections, but also turns, branches, for the creation of which various fittings are used. And shut-off valves are installed to regulate the flow of the working medium. All this creates resistance, so it is very important to perform a number of calculations before starting the installation of the pipeline, including determining the hydraulic resistance. This will allow to reduce heat loss in the future and, accordingly, avoid unnecessary energy consumption.

Environmental safety of galvanic cyber-production

The galvanic production is an industry direction to produce hazardous for environment technological wastes during the technological operations completion process. The innovative approach to project the galvanic production relates to the engineer cyber-systems (CS) involvement into the cleaning facilities infrastructure to neutralize the industrial wastes. Each CS is specialized in cleaning a particular type of waste until there is only sediment left and hazardous matters are crystallized. The engineer and industrial CS are united with a pipeline communication, which are resistant enough against the wastes aggressive solutions. A separate channel of cleaning is an administrative and household channel where wastes with biological contaminations are being circulated. There is an infrastructure system scheme for the advanced galvanic production cleaning facilities equipped with wastes neutralization engineer CS. The cleaning technologies are described to provide the residue levels of contamination into the outlet galvanic production collecting units to influence minimum-ly the ecology.

RESEARCH OF LIGHT ABSORPTION COEFFICIENT OF ASPHALTENE-RESIN-PARAFFIN DEPOSITS OF PRODUCING WELLS GAS-CONDENSATE FIELD

Serious problems affecting oil production, causing complications in oil wellbores, in oil field equipment and pipeline communication is the formation of asphalt, resin, and paraffin deposits. Their formation reduces the overall performance of the system of exploitation and violation of operating practices. Today, in the area of asphaltenes deposits, resins and paraffin, our scientific research and work is based on two different directions: prevention (i.e. slowing down) deposits and their removal. In this paper, we consider one of the most effective methods of disposal: chemical reagents with the use of solvents, the selection of which produce, given the type of deposits. In traditional practice, the definition of the type of deposits is laborious and a time-consuming process, and therefore, it is necessary to create new methods for studying the chemical composition of the asphalt, resin, and paraffin deposits. The article presents the results of research studies of the optical properties of asphalt, resin, and paraffin deposits. It also presents a methodology determining the type of deposits, improves the quality of selection of reagents and solvents. The relationship of the building-up deposits' intensity on their composition, which can be determined by light absorption coefficient of oil, and based on this fact that it is possible not to only choose effective solvent, but also to study the impact of the solvent on the asphalt, resin, and paraffin deposits for obtaining important dependencies, is vividly demonstrated in this work. The results, which were obtained in the research process of such relationships and dependents, are allowed to develop rapid method of determining the type of operational asphalt, resin, and paraffin deposits in the wells and to choose their suitable solvent. The research results can be used to improve the efficiency of chemical control methods for organic deposits during the exploitation of complicated oil, gas and condensate fields.

Analytical Performance Models for MapReduce Workloads

MapReduce is a currently popular programming model to support parallel computations on large datasets. Among the several existing MapReduce implementations, Hadoop has attracted a lot of attention from both industry and research. In a Hadoop job, map and reduce tasks coordinate to produce a solution to the input problem, exhibiting precedence constraints and synchronization delays that are characteristic of a pipeline communication between maps (producers) and reduces (consumers). We here address the challenge of designing analytical models to estimate the performance of MapReduce workloads, notably Hadoop workloads, focusing particularly on the intra-job pipeline parallelism between map and reduce tasks belonging to the same job. We propose a hierarchical model that combines a precedence graph model and a queuing network model to capture the intra-job synchronization constraints. We first show how to build a precedence graph that represents the dependencies among multiple tasks of the same job. We then apply it jointly with an approximate Mean Value Analysis (aMVA) solution to predict mean job response time, throughput and resource utilization. We validate our solution against a queuing network simulator and a real setup in various scenarios, finding very close agreement in both cases. In particular, our model produces estimates of average job response time that deviate from measurements of a real setup by less than 15 %.

Research on Key Technologies of the Cableless Pipeline Robot

The cableless pipeline inspection robot is a hot topic in current domestic and international oil and gas pipeline in the research of special robot. The functions of robot body for communication with the outside world, energy supply, mobile running gear, and flaw detection module are several key technologies in the pipeline robot in application. This paper presents the measures for those key problems: Fiber-optic conveys video images and data in the pipeline and robot bi-directional cableless communication with the host computer monitoring equipment is completed outside the pipeline; In the aspect of energy supply the transformer secondary coil is generated by Charging stations set up outside the pipeline and lithium batteries is recharged to complete function of robot self-propelled ; Mobile running gear is achieved through the use of the arm of the parallelogram unit peristalsis to walk forward;The flaw detection technology adopts both video acquisition and ultrasonic phased array imaging with dynamic focusing and deflection characteristics to improve flaw detection efficiency and detection identification.

Hardware Design of a Pipeline Inspection Robot

Pipeline robot research has a broad prospect of application and value. Based on the study of the pipeline robot domestic and foreign and in the fully understanding of the questions and intrinsic request of the existing pipeline robot control and communication systems, a general design scheme of wheeled pipeline robot is proposed in this paper, and according to this idea, choice and analysis to the robot is made. After that, the moving carrier mechanism, the components selections and circuits of control system for this pipeline robot are designed in detail.

The Design of High-Performance Dynamic Asynchronous Pipelines: Lookahead Style

A new class of asynchronous pipelines is proposed, called lookahead pipelines (LP), which use dynamic logic and are capable of delivering multi-gigahertz throughputs. Since they are asynchronous, these pipelines avoid problems related to high-speed clock distribution, such as clock power, management of clock skew, and inflexibility in handling varied environments. The designs are based on the well-known PSO style of Williams and Horowitz as a starting point, but achieve significant improvements through novel protocol optimizations: the pipeline communication is structured so that critical events can be detected and exploited earlier. A special focus of this work is to target extremely fine-grain or gate-level pipelines, where the datapath is sectioned into stages, each consisting of logic that is only a single level deep. Both dual-rail and single-rail pipeline implementations are proposed. All the implementations are characterized by low-cost control structures and the avoidance of explicit latches. Post-layout SPICE simulations, in 0.18-mum technology, indicate that the best dual-rail LP design has more than twice the throughput (1.04 giga data items/s) of Williams' PSO design, while the best single-rail LP design achieves even higher throughput (1.55 giga data items/s).

A Parallel Multipole Accelerated 3-D Capacitance Simulator Based on an Improved Model

This paper gives an improved single-layer potential formula for extracting the parasitic capacitance of multiple conductors, embedded in the infinite or finite dielectrics, based on the MultiPole Accelerated (MPA) method. In fact, many capacitors should be considered to be bounded by a finite region. This indicates that the improvement is necessary to raise extraction accuracy. The nonuniform cube subdivision is used in the simulator. The reason for this is that it is an important base of further implementing the real adaptive calculation, for example h-version of the MPA. Also, it can save a lot of memory for ignoring most empty cubes. Only two lists of the cubes are used, thus simplifying the classification of five cube types. The simplified cell classification scheme eases book keeping in the parallel implementation. In developing a parallel MPA algorithm on the transputer network, a parallel machine of the MIMD type, we pay great attention to balancing workload and reducing communication for general nonuniform distribution of the particles. The results show that the total balance can be well achieved by balancing workload in every level of cubes. The pipeline communication mode shows higher efficiency if the processor number P used can well match problem size.