Field experiments of domestic and overseas studies show that WAG flooding can further improve the oil recovery by 5%~10%. It can be used as an economical and effective way to improve oil recovery in the tertiary phase.With the help of laboratory displacement experiments,improved simulated cores,and setting up the experimental control group, a new experimental idea is put forward, and the mechanism of WAG flooding for enhancing oil recovery is revealed and clarified. The experimental results show that WAG flooding can slow the gas channeling and change the unfavorable water⁃oil ratio. Injecting⁃gas enhances the exchange, diffusion and imbibition of three⁃phase molecules. After alternating injection of water and gas, water drive seals high permeability zone, gas drive sweeps tiny pores along with the effect of gravity differentiation. The displacement process is a dynamic process in which the state of water binding in pores is broken constantly, and the large pores are plugged alternately. The breakthrough effect of injection gas on fluid is weakened, and the water absorption profile is improved, which prolongs the water breakthrough time of oil well and improves the oil recovery. For the reservoir with serious heterogeneity, the dynamic plugging effect produced by alternating water injection can further improve the oil displacement effect of WAG flooding.

After the low permeability oil field of Ansai enters the medium and high watercut stage, the main oil reservoir is washed, the production of many wells is low, and the direction of remaining oil digging is unknown. Taking Chang 6 oil layers of Yanchang formation in Wangyao area as the object, on the basis of modern sedimentology, highresolution sequence stratigraphy, basic logging theory and development geology, combining the rock outcrop, sealing core drilling in-spection well and test data, the characteristics of single oil sands scale reservoir heterogeneity, injection and mining connectivity and distribution of residual oil are revealed. The results show that the heterogeneity of single sand bodies has an important influence on the water flooding process of low permeability reservoir, and it also has important inspiration for the division and combination of the development oil layer, the form of well network and the adjustment of water injection. The recovery rate is increased by 4%~6% through comprehensive adjustment as pattern infilling, adjustment of injection-production relation of the single sand body, the precise fracturing and profile control.

 

In order to further study the effect of mobility control on low permeability layers of heterogeneous reservoir, a numerical simulation model for polymer flooding is established which based on the data of indoor core simulation experiment. This model is used for simulating heterogeneous reservoir with 1 000×10-3μm2, 300×10-3μm2 and 50×10-3μm2 of the effective permeability respectively. Three kinds of polymer solutions which have different concentrations are injected into core, by changing the way of injection to achieve mobility control. The effect of polymer slug size and sequence on oil displacement is analyzed. The results show that under the same conditions of polymer solution number, slugsinjection schemes achieve better effect with polymer concentration ratio of 2∶3∶4.The effect of slugs size on high permeability layers is little, while the effect on low permeability layers is obvious. So it can be indicated that measure of mobility control is an effective action to enhance oil recovery. 

In the power grid fault protection,relay protection and breaker tripping, misoperation, and information in the upload process lost, distortion and other problems make fast and accurate fault diagnosis is still a problem. Although the neural network method is applied, the neural network is easy to fall into local minimum. In this case, the combination of fault diagnosis method based on wavelet neural networks and genetic algorithms were proposed. Gwnetic algorithms learn wavelet neural network weights, scaling function, structure to determine the optimal wavelet neural network. Computer simulation was done in an example.The simulation results show that the optimized fault diagnosis system is superior to BP algorithm of fault diagnosis system, improve the accuracy of fault diagnosis.

Submicron zeolites FeAlMFI were synthesized by hydrogel constraint synthesis method,with silica sol, ferric nitrate and aluminum sulfate being used as silicon, iron and aluminum sources, respectively, and TPABr as template agent, methyl cellulose as micro-reactor template. The factors that influence particle size were also discussed, such as crystallization time, crystallization temperature and MC. The structure and particle size of samples obtained were characterized by means of XRD, ICP and LPSA. The results indicate that the synthesized zeolite samples are submicron FeAlMFI zeolites, with 100～200 nm particle sizes. The catalytic performance of ZSM-5 and FeAlMFI zeolites was investigated by the methanol-to-olefins reaction. The results of methanol reaction tests show that submicron FeAlMFI zeolite catalyst exhibited a high active stability of methanol conversion and the selectivity to light olefins is increased significantly to 85.9%.

The combination systems with alkali was prone to cause scaling，so its need to add scale inhibitors. To research the inhibitors effect on the systems interfacial tensions(IFT), the IFT between Zhuangxi crude oil and combination systems were investigated. The combination systems were comprised of organic phosphonate antiscale, small alkali and three surfactants which included SLPS(Shengli petroleum sulfonate), OPP4 (octylphenol polyoxyethylene phosphate ester), and PBET17(the mixture of octadecyl and hexadecyl dimethyl hudroxypropyl ammonium phosphate ). The results show that surfactants singly cantreduce IFT to 0.01 mN/m, and the alkali/surfactants compound systems do not work effectively either. However, the complex systems of organic phosphonate, surfactants and alkali have ideal synergistic effect and most of them can bring IFT down to 10 ^-4 mN/m.

The energy consumption of a complicated heat-exchange network in chemical industry was studied with pinch point technology and the technology of flow simulations. A new design was provided which reclaims the greatest remained energy. It was found that some special loops in heat-exchange network have some new characteristics which have not been mentioned in former dissertations, while optimizing the new designed network through disconnecting the loops in the network. It was not appropriate for disconnecting these special loops to use the general method. For the problem, proposes an advanced solution method and examines the solution with the help of flow simulations technology. The results show that adjusting interrelated parameters solves some probably problems of new network run process. Using the technology of flow simulations can more apply the pinch point technology in heat-exchange network design.

Corporation collectivize production model and integrated finance administration system were proposed for the problem of corporation finance administration, which was based on the integration relation and system requirement analysis with each tache of supply, production and sale. The son systems function of the integrated finance administration was designed. The integrated finance administration system with C/S, B/S model was empoldered using UML, STRUTS frame model and J2EE component flat roof. The practicability, validity and economy of the system are proved through the application in a group company.