he swelling and dissolution process of AP-P4 was studied qualitatively and quantitatively by means of microscope observation method and colloid weighing method, and the effects of main metal ions, residual reagent and temperature on the solubility of AP-P4 in were analyzed, which were against dissolution characteristics of hydrophobically associating polymer AP-P4. The results showed that the dissolution rate of AP-P4 in water was mainly controlled by the swelling velocity of polymer swelling and the dissolution and diffusion rate of the surface molecules. The low mass concentrations of Na+, Ca2+, Mg2+ or SDBS had little effect on the solubility of AP-P4, and a small amount of Fe3+ or OP-10 in the solution could significantly alter the solubility of AP-P4. Increasing the temperature properly could promote the dissolution of AP-P4.
Mesoporous carbon was prepared by loading four different metal ions Ag+/MC, Zn2+/MC, Cu2+/MC, and Fe3+/MC by impregnation method using mesoporous carbon (MC) as the carrier.The influence of the loading quality and the species of the metal ions on the adsorption were investigated.The results show that the adsorption capacity of two thiophene (DBT) can be improved by loading Ag+, Zn2+, Cu2+ and Fe3+ on the surface of mesoporous carbon.The optimum adsorption efficiency of mesoporous carbon with different metals is compared. The order of adsorption capacity of DBT is Ag+/MC>Zn2+/MC>Cu2+/MC>Fe3+/MC. Among them, the adsorption efficiency of loading 10% Ag+ on the mesoporous carbon is best. Compared with the untreated mesoporous carbon sulfur saturation capacity increases 1.11 mg/g, through the sulfur capacity also rises 1.93 mg/g.
The cationic plugging agent of water base drilling fluid was prepared by emulsion polymerization with styrene (St), butyl acrylate (BA) and cationic polymerizable monomer. The structure characteristics of the plugging agent were analyzed by infrared spectrum. The result of soaking test with clay ball showed that cationic plugging agent emulsion with a mass fraction of 5.0% was equivalent in inhibiting clay hydration property of saturated brine. The effect of cationic plugging agent on the properties of CaCl2 free phase drilling fluid was evaluated. The results showed that the high temperature and high pressure filtration (120~130 ℃) could be controlled at about 10 mL for the non phase drilling fluid with CaCl2 content of 25.0% when the cationic plugging agent is 2.0%.
Pipeline crossing structure was very easy to be affected by the settlement of soil along the river, and effective preventive measures should be adopted to effectively prevent the damage to the crossing structure. The finite element model of pipeline crossing structure and soil interaction was established, and the stress change of pipeline span structure with the fixed bracket was established. It was found that the fixed bracket could effectively reduce the stress value of the pipeline when the span structure was affected by the settlement of soil mass, and the installation position of the fixing bracket was more prominent to reduce the stress value of the pipeline span structure. The results could provide a theoretical basis for the safety construction of pipeline crossing structure.
The conventional technologies of reducing heavy oil viscosity exit the shortages of affecting the quality of crude oil, heavy workload, high cost and other defects. Therefore, new method of heavy oil viscosity reduction based on hydrocarbondegrading bacteria was discussed. A hydrocarbondegrading bacterium was isolated in the laboratory. Its growth curve and its function of reducing viscosity and wax in heavy oil were studied. The results showed that the reduction rate of crude oil ranged from 22.49% to 32.93% and wax precipitation point decreased from the 44.4 ℃ to 39.5 ℃. The same as wax content dropped from 13.00% to 3.80%. The resin content dropped from 16.45% to 13.75%. After adding D1 strain, wax removal rate was 70.08% and wax precipitation point fell 4.9 ℃. The strain had a significant effect on reducing the viscosity of heavy oil and wax content.
In recent years, with the increasing demand for natural gas, more and more attention was paid to the transmission efficiency of gas transmission pipeline. Because the main loss of gas pipeline was the friction resistance, therefore reducing the resistance became the focus of the study. To explore the Vshaped riblets in transmission gas pipeline of drag reduction application, FLUENT was used to simulate two different geometric size of Vshaped riblets. The pipeline drag reduction of bionic riblets could approximate switch into flat gas transmission for numerical simulation. The results of the study showed that: compared with the smooth gas transmission pipeline, Vshaped riblet gas transmission pipeline of the turbulent boundary layer of velocity profile in the logarithmic layer was different| in the same gas velocity inlet, Vshaped riblet at the top of the shear stress was greater than the bottom of the riblet, also riblet on the bottom of the near wall local turbulent kinetic energy was small| the riblet height and spacing size of both 0.90 mm Vshaped riblet pipeline had more drag reduction effect than the size of both 0.51 mm Vshaped riblet pipeline.
The three-dimensional model is established with the numerical simulation software TOUGH2 of flow and heat migration, through a constant speed with long time of injecting fluids containing CO2 to simulate CO2 geological storage research on the effect of formation temperature. The results show that the formation temperature is in equilibrium before CO2 geological storage and the original balance is broken after sealing up. The higher the formation permeability is, the more conducive to the exchange of temperature. The temperature of whole formation undergoes the process from unsteady state to steady state, and because the exchange of formation temperature is restricted by the energy conservation, the final temperature of the whole formation is about at the initial time and the middle temperature of the lower formation temperature. The injected fluid continuously has a limited influence on the formation temperature, and the formation temperature changes rapidly in the early, the late change rate gradually slows down.
The channel prediction of Fuyu reservoir has been always highly emphasized. Using the conventional seismic attribute to predict channel is difficult to achieve the precision requirements because of the complex fault and the fast lithofacies phase in Fuyu reservoir. Aiming at this weak problem, the method of combing gray correlation analysis and support vector machines is used to establish a set of technical process which is suitable for the prediction of fluvial reservoirs under complicated geological conditions. In Fuyu test area in X reservoir of Daqing oilfield as an example, firstly, conventional seismic attribute of sedimentary unit dimensionless, obtained by the method of gray correlation analysis of the seismic attribute correlation factor, the greater the degree of correlation, indicating that the response probability of attribute river is higher. On this basis, the optimal correlation factor sequence a accumulation of large properties, first order accumulative sequence is generated, used as the input into the support vector machine training sample, so as to complete construction of support vector machine river forecast model. Drilling confirms that the prediction based on Gray Correlation Support Vector Machine has a larger coincidence rate of drilling. Combined with the superiority of seismic inversion to predict the channel sand boundary, supplemented by data of core, well logging and mud logging data to complete sedimentary microfacies in X Test Area Fuyu reservoir. Meanwhile, drilling further confirms the reliability of predicting channel and then the industrial oil flow well is successfully obtained. The results of comprehensive research show that this method is suitable for high channel prediction accuracy. It can be used as a better channel prediction method under complicated geological conditions.
In the 20 years of waterflood development in the Niuxintuo oilfield, the contradiction between water injection in plane and interlayer is prominent, so it is urgent to adjust the injectivity profile, especially for depth profile control. Using the existing profile control agent system to improve the profile control, the effect of gel formation is poor, and the profile control effect is not satisfactory. It has been found that the presence of dissolved oxygen in the profile control agent is the main factor affecting the effect of profile modification. The site provides the polymer, crosslinking agent and water samples, the use of commonly uses deoxidant on Niuxintuo oilfield profile control agent to improve the effect to carry out a series of laboratory experiments.The results show that sodium benzoate and hyposulphite for improving the effect of gumforming compound have certain effect.
With the rapid development in recent years, ultra low permeability oil and gas resources, the main controlling factors of the elastic recovery stage has attracted wide attention. In order to study the factors affecting oil recovery in ultralow permeability reservoir during elastic exploitation stage, the permeability, viscosity, failure pressure and failure radius are combined into 4 factors and 3 levels orthogonal experiment, through laboratory experiments, the order of influence degree is as follows: failure pressure difference>permeability>failure radius>crude oil viscosity. Combined with the scanning electron microscope images, it is found that the degree of recovery is related to the stress sensitivity and the startup pressure gradient, besides the initial elastic energy. In addition, the starting pressure gradient mathematical models of permeability, fluidity, fluiditypressure difference are compared and analyzed. Through the error analysis of numerical simulation and experimental data, the model which is closer to the real situation is chosen as the pressure difference mobility model.
GH4169 Nickel-based superalloys widely used, but it was difficult to cut.The residual stress of the machined surface could easily lead to the deformation of the workpiece, thereby the machining quality of the workpiece was affected.The variation of residual stress under different cutting parameters was studied by the simulation software Deform-3D. Simulation results showed that the change of cutting speed had little influence on the surface residual stress, the surface residual stress was increased with the increase of the cutting depth and the feed rate. The residual stress in workpiece was increased with the increased cutting parameters.
Crack was one of the most dangerous pressure piping flaws. Beyond that, it was the main cause of pressure pipeline accidents. Based on related concepts of fracture mechanics, the 3-D models of pressure pipeline subjected to internal pressure and its surface oblique cracks under different Angles were established according to the ANSYS finite element software. In addition to that, the stress intensity factor of crack tip was calculated and analyzed by the finite element and the change rules between the stress intensity factor and crack Angles were concluded. According to that, the crack tip stress field strength was analyzed quantitatively. At the same time, it also provided some data supports for the study of inclined crack on the surface of pressure pipeline.
College testing measurement is very important to choose talent. The quantification of tacit knowledge in test paper is the key to choose innovative talents. First of all, the traditional statistical methods are used to analyze the test results,and then to use support vector machine (SVM) method on the basis of it. It is concluded that the classification of different effects with the introduction of polynomial kernel function，radial basis kernel functions and takes both advantages of combined SVM kernel function training. and with different factors to show the quantitative comparative analysis of tacit knowledge. The experimental results show that the test results of evaluation should be based on the analysis of explicit and implicit knowledge analysis. Reasonable combination kernel function is applied to the pros and cons of the examination measurement is effective method.
In the text feature word extraction algorithm,TF-IDF algorithm is the most common feature weight calculation method. On the basis of the traditional TF-IDF extract algorithm, a new keyword extraction algorithm based on the text word length is proposed.Using chinese phrase word segmentation technique to identify long words and ordinary words in text,the proposed TF-IDF-WL method is used to recompute weights for different lengths of words, and the keywords are sorted by weights. Experimental results show that the new feature word extraction algorithm can more accurately reflect the lexical length of the feature words.Compared with the traditional TF-IDF algorithm, the algorithm has greatly improved accuracy and recall rate.
The mobile robot can sense the surrounding environment，and can plan the path to reach the target point in real time， among which the obstacle avoidance problem is the focus of the research. A control scheme for path planning transformation of mobile robot in obstacle avoidance without detailed environmental information is designed.In this scheme，the robot can according to the motion tracking mode，obstacle avoidance model and robot state gradually approaching the target，using the Matlab simulation experiment in any shape obstacles as far as possible. The obstacle experiment verifies the effectiveness of the adaptive path planning control scheme is proposed.
Reducing energy-related carbon emissions while maintaining the industrial economic development was an inevitable choice for achieving sustainable development. Based on the extend Kaya identity and the logarithmic mean Divisia index method（LMDI）, a decoupling efforts decomposition model was constructed, which were adopted to analyze energy structure, energy intensity, industrial structure and industrial output for industrial carbon emissions impact and their relative decoupling efforts. The results showed that industrial output factor played a promoting role in industrial carbon emissions, energy intensity factor and industrial structure factor had some inhibitory effect, and energy structure factor's role was very limited. 2002—2012, Liaoning province was in a weak decoupling effort period, and the efforts was not ideal. 2012—2014, Liaoning province was in a strong decoupling effort period, the effects was significant for reducing carbon emissions.
Taking a college of Petroleum Science and technology support program for the study sample, the university scientific research performance evaluation system was established by using AHP. Based on expert experience and background knowledge the indexes were set with the AHP model, the weights were obtained. Combined with the actual research projects the degree of analysis and calculation was completed, the mathematical conclusion was obtained and the purpose of performance appraisal was achieved. The management decision was provided as the basis for further research of university.
