Papers by Keyword: Leak

Abstract: Oil transport is used mainly by pipeline networks to transport oil from refineries and distributions points to the consumers. This is the main way to transport oils especially in areas of difficult access, ensuring efficiency, lowest cost and safety. In the chemical and petroleum industry it is possible to observe the presence of leak in the pipes, which has stimulated the development of reliable techniques for the rapid and accurate detection of leaks along the pipe in order to eliminate or minimize loss and environmental damage. In this context, this study aims to evaluate the effect of the numerical presence of leakage of two-phase flow (oil-water) pipe connections using the commercial software ANSYS CFX. The results from the fields of pressure, velocity and volume fraction are presented and assessed for illustrating the effect of the presence of the leak in the dynamic flow in the pipe with a curved connection.

Abstract: The oil industry has sought to minimize the environmental impact from mining activities and oil transportation. Oil transportation by pipelines is subject to failures and leaks which cause financial losses and environmental damage, often irreparable. Currently, the study of leaks in pipelines has attracted the attention of many researchers. The aim of this study is to evaluate the influence of the curved curvature radius connection in pipeline leakage. We used a mathematical model of multiphase flow to describe the two-phase flow, based on the particle model. Oil is the continuous phase while water a dispersed phase. To model this effect we used the turbulence model SST. All simulations were carried out using the Ansys CFX ® commercial code. Results of the total pressure and pressure drop are presented and discussed. The results confirm the influence of the bending radius of curved connection on the behavior of the total pressure and the total pressure drop in two-phase flow in pipelines with and without leakage.

Abstract: Spherical leak detectors can detect very tiny leakage in pipelines and have low risk of blockage. It is very suitable for submarine oil pipelines. In this paper, the passing ability of the detector in the vertical segment of a pipe was studied using CFD simulations. The simulation shows that the drag on the detector by the flow inside the pipe is related to the flow velocity V and the diameter ratio λ (d/D).We found it’s a good choice when λ ranges from 0.7~0.8, and a spherical leak detector (λ=0.8) is designed. The field experimentation shows that the prototype of the detector can go through within normal economical flow velocity (0.7m/s-1.5m/s) in 8 inch pipelines.

Abstract: Features of the piston reciprocating motion is a high commutation frequency, small displacement, the impact force. Requirements of the piston movement is able to adapt quickly to change. Reducing the resistance movement of the piston will be able to make more flexible movement of the piston .The seal with mating surfaces can reduce the resistance movement . The gap of mating surface of the piston rod formed hydraulic oil spill. Mating surface seal problem is that the oil leakage is larger。Piston movement way of hydraulic vibrator is a kind of variable frequency and variable amplitude, in the form of constant flow. The form of the oil cylinder and the piston movement is the same. The cylinder as the output component of hydraulic vibrator output movement is to reduce the leakage .

Abstract: Micro foam drilling fluid has irreplaceable advantages in reservoir protection, drilling speed, improve the cementing quality and leak plugging, especially suitable for the "three low" Daqing peripheral oilfield Haita area. Indoor the foaming agent, foam stabilizing agent were screened, Preferably choose the efficient composite foaming agent, stabilizer and thickener, the drilling fluid system is transformed into micro foam drilling fluid system. And evaluate the inhibition, anti temperature, anti pollution (anti clay, calcium, anti kerosene) reservoir protection capability, The micro foam drilling fluid leakage, oil reservoir protection, speed up mechanism and micro foam drilling fluid rheological characteristics were studied, Set up a specific rheological model of Micro Foam Drilling fluid, According to the characteristics of Gulong oilfield,R&D the calculation software of Micro Foam drilling fluid density changes with the temperature, pressure and provide guidance for safe drilling. Field application shows that the system has the advantages of simple preparation,convenient maintenance, easy transformation, drilling fluid properties can meet the requirements of drilling technology, To ensure the safe, fast, and high quality drilling of oil and gas,reduce pollution,improve the productivity of a single well.

Abstract: Acoustic emission (AE) testing (AET) is an effective, nondestructive testing (NDT) method which is widely used throughout the petrochemical industry. It especially plays an important role in inspecting of atmospheric storage tank floor corrosion, oil and gas pipeline leakage and pressure vessel cracking. The AET methods and evaluation of storage tank, pipeline, sphere and other equipment in oil and gas storage and transportation system are reviewed in this paper, and the development trends of AE technique also be introduced. This technique has important significance in ensuring the security.

Abstract: Electric scissor aerial work platform generally uses hydraulic cylinder to lift. The decline solenoid valve is an important part of the entire hydraulic system, which usually installed in the bottom of the hydraulic cylinder. The main function is locking hydraulic cylinder to prevent the platform sinking due to its weight, protect workers safety. This paper first introduces its structure and working principle, and then does the experiments such as resistance pollutants, leakage, and a comprehensive analysis of the decline in the performance of the solenoid valve.

Abstract: The structure and working principle of a new translational piston rotary compressor was introduced and made theoretical analysis in this paper. It was pointed out that the translational piston rotary compressor had not only fine practical, which with less friction loss and leak loss than the traditionally rotary compressor, but also the advantage of simply structure and technics and low manufacturing cost. The rotary compressor was practical and promising.

Abstract: The urban heat pipe network fault diagnosis system was designed in this paper so as to realize the automation diagnosis. The paper uses the simulation calculation method and the heat pipe network fault diagnosis system to analyze and study an urban heat pipe network leak fault. The diagnosis results of the heat pipe network fault diagnosis system are almost the same to that of the simulation calculation method. Moreover, the system can accurately locate the leak point and the positioning accuracy is 5%. Thus the heat pipe network fault diagnosis system which is designed has a certain practical value.

Abstract: The urban heat pipe network fault diagnosis was studied in this paper. According to differential equations and boundary conditions, the author deduces the function relations between pressure and flow in unsteady flow. On the base of above investigations, a heat pipe network leak pipeline diagnosis method and a leak positioning method are proposed here, the pipeline alarm valve ε0 and the leak alarm valve εF are designed. We can judge whether heat pipe network leaks or not through the law of flow conservation, and search out the leak pipeline by judging the size relation of pressure drop, ε1 and ε0, before and after pipeline leaks. It then locates the leak point by judging the size relation of ε2 and εF before and after the pipeline leaks. Moreover, the location accuracy is 5%.