Considering the difficulty in the estimation of safe shutdown time of oil pipeline due to the complex safe shutdown of submarine oil pipeline influencing factors, the radial basis function neural network model was proposed for predicting safe shutdown time of submarine oil pipeline and the various influence factors on safe shutdown of oil pipeline were analyzed. The model was validated on the basis of actual data and the network was trained and the accuracy was verified. The results show that the fitting and simulation precision for training and testing samples is 98.40% and 97.33%, respectively. So the safe shutdown time of submarine oil pipeline can be predicted validly, and the important basis of safe transportation of submarine oil pipeline was provided.

The movement track of the solid particles in a cyclone separator has been studied by numerical simulation. Discrete phase model (DPM) was adopted for solid field. The physical mechanism for the particles movement in a cyclone separator is studied by analyzing the influence of different particle size and inlet velocity on solid particles track in a cyclone separator. The results show that the particles track in a cyclone separator is complex, and it is influenced by inlet velocity and particles size simultaneously. The track of same size particles is different at the case of different inlet velocity, and small particles are easier influenced by the inlet velocity. The simulation results could provide some theoretical guide for engineering applications.

After underground pipeline leak, crude oil in a low-speed flowed in porous media. With the increase of leakage radius the velocity decreased near the hole, velocity contour changed little with time extension, affected by gravity velocity contour had different degrees of settlement. In the front, with the increase of leakage radius oil volume fraction decreased, contour gradient is large, distribution is more intensive and continue to expand over time. Affected by gravity ,volume fraction contours onrush to the right. It could monitor the real-time spread of oil diffusion discipline and calculate the amount of oil leaking to research the distribution of leakage, and time and flow rate on volume fraction distribution. It provides an effective data support to guide the accident repair and evaluate the formation damage.

In the process of oil pipelines’starting to convey, precise calculation and prediction of temperature field of the soil around pipelines and law of medium temperature in the pipelines changing with time are the key to identify the time of putting oil in and preheat medium totals. By water as preheat medium, and calculations of conducting heat’s numbers in the process of pipelines’ preheat under different flowing speed circumstances, it analyzed distributions of temperature field of the soil around preheat pipelines and temperature dropping along pipelines with distances, and finally get oil pipelines’ preheat conditions under flowing speed of various medium, which can help set corresponding oil-conveyed technique and attain the goal of safety and saving energy.

The research of shutdown temperature drop rule in heated oil pipeline is the primary condition to ensure the safe restarts of the pipeline. Because of the complicated geological conditions along the pipelines, the pipelines often cross rivers and lakes. But there is no thermal-storing material such as soil around the underwater pipelines, so the shutdown and restart time of the whole lines depends on the temperature drop of the underwater pipelines. With the development of offshore oil field, the research of safe shutdown and restart rule become very important. Using FLUENT software, enthalpy-porosity technique was adopted to simulate the temperature drop rule of under water line during stopping transportation considering the rude oil concretion latent heat effects in temperature drop, and the position of erstarrungs zone and dilution zone and liquid oil zone was gained in different time. The result indicates that the temperature of rude oil in pipeline drops quickly at the beginning of stopping transportation; in the middle and later period, because the rude oil solidification release thermal and the layer of solidification become thicker, thermal resistance becomes larger, and the rate of temperature drop is decreased. The simulate result is in accordance with the fact.

Using finite element method, the soil temperature field around the buried hot oil pipeline during starting transportation was calculated numerically. Then the time for oil was identified precisely. The results show that 20 h after preheating for oil can be in line with the requirement. The results are in accordance with engineering. A reliable theoretical basis is provided for hot oil pipeline to operate economically and securely through applying the technology.

The steam injection boiler of Liaohe oil field Jinzhou oil extraction factory produces steam with recycling water. Because of water quality over standard, silica and salt fouling and crystallizing resulted in over temperature of the tube in superheated region, allowed stress decreases sharply and explosion of tube. With maximum flame diameter 3 m, it is happen that silica and salt fouling and crystallizing at the same time resulted in explosion of tube. The main method to solve above problem is decrease steam dryness or alternative variation, and the two worst working conditions  don′t  occurred at same time.