Applied Mechanics and Materials Vols. 295-298

Abstract: Southwest Gudao oilfield of heavy oil reservoir characteristics is complex, the fine reservoir division and correlation for increase in oil reserve and production is of great significance. According to the reservoir multi-level contrast method, will study area Ng5-6 sandstone group is divided into 11 small layer, 14 deposit time unit, and to establish a comparison model of reservoir. Reservoir contrast results and its application effect is good, improve the research area of thick oil development effect, and the economic benefit is remarkable.

Abstract: To ensure the continuous and stable exhaust process of coalbed methane wells, prevent coal fines from lowering the guidance ability of seepage channel, and solve the problem of stuck pump and submerged pump caused by gathering of coal fines, taking Hancheng block as the experimental area, this paper analyses on the source of the coal fines, and divides it into two categories of original coal fines and secondary coal fines. Based on the characteristics of coal petrography, coal structure, coal seam and engineering factors, we make analysis of their factor on the output of coal fines, and we conclude that the characteristics of coal petrography are the foundation, and the engineering is the precipitating factor, but the development of deformed coal is the primary factor. The study on the division of types of coal fines and output factors can provide a guidance for reasonable coal-fines-control measures.

Abstract: Fracture and matrix porosity are two porosity systems in fractured bottom-water reservoir. Knowing the oil recovery in matrix system provides guidance for the later development of the reservoir. Using material balance theory, and combining with Leverett function, oil recovery of matrix and fracture system are calculated respectively, and the ultimate oil recovery of matrix system is predicted.

Abstract: Because of the limitation of logging instrument and tools resolution and response characteristics, the accuracy of identifying fracture is relatively low. This gives severe impact on accurate interpretation and evaluation of reservoir. In this paper, Monte Carlo simulation is applied to take its advantage on solving uncertain and stochastic problem to improve the accuracy of conventional logs identifying fracture of Carbonate reservoir in Middle East. According to the contrast result with core and image logging and well test data, this method is proved to be effective. It has an important significance for fracture identification in the situation of lack of image logging data but only conventional logs.

Abstract: Accurately calculating dynamic reserves for single well in a low-permeability gas reservoir has an important guiding significance to high efficiency development of the gas reservoir. During the development of the gas reservoir, dynamic analysis methods were often used to calculate dynamic reserves. Dynamic analysis methods mainly include the material balance method, the gas production method in unit pressure drop, the flexible two-phase method and the production unstable method. Dynamic reserves for four types of gas wells in a low-permeability gas field were calculated using these four methods. Calculation results show that dynamic reserves from big to small are respectively obtained using material balance method, gas production method in unit pressure drop, flexible two-phase method and production unstable method. Calculating dynamic reserves obtained by flexible two-phase method and production unstable method are utilized to production dynamic data of gas well, and those obtained by material balance method and gas production method in unit pressure drop are utilized to the reservoir parameters of different state. Therefore, the values of dynamic reserves obtained using flexible two-phase method and production unstable method in the low-permeability gas reservoir may be more accurate than those obtained using the other methods.

Abstract: When CaCL2 or CaBr2 solution is used to kill the well during the pump check process，the productivity of the oil well becomes unstable. The developed FRY surfactant that a nonionic polyether surfactant is used as main material and compounded with various anionic and zwitterionic surfactants could solve this problem. The results show it has excellent foamy characteristic and wettability, and can eliminate the alkali and water sensitization of stratum under acidic condition. The FRY surfactant has been successfully applied to the plugging relief of oil well. The synthesis, performance evaluation and field application of the FRY surfactant are introduced in the paper.

Abstract: Zhongyuan Oilfield is featured by low gas reservoir pressure, long perforation distance and bad well condition of some wells. Rimming at setting these problems and realizing effective development of the reservoir, research work on enhancing recovery techniques suitable for the reservoir condition was carried out. The optimized fracturing design parameters and operation methods, along with the propping agent slug and the optimal perforation techniques, greatly improved the accuracy rate of fracturing parameters design, the successful operation ratio, and the fracturing effects. By optimizing the low damage fracturing fluid adaptable for different kinds of gas reservoir and adopting techniques such as comprehensive protection, segregated gel breaking and hard closing of fractures in operation, the reservoir damage by the fluid was extremely decreased.

Abstract: With oil sale industry becomes competitive fiercely, profit of Gas station oil product retail link tends to drop, while non oil business is in the vigorous development these years. In the gas station business, sales of refined oil and non-oil business can promote each other by ways of marketing strategy, which includes reasonable arrangement of categories of products and services, scientific and reasonable pricing strategy, the implementation of effective incentives, .these strategy can play a role of the leverage by which oil sales can promote non oil business, and Vice versa. Gas station non-oil business refers to the business outside of refined oil business, including convenience stores, restaurants, car wash, car, oil, auto sales, advertising agency, telephone, communication services, ATM machines, ticket sales, vending machines etc,Non-oil business development is extension of oil retail business development, is accompanied by the petroleum retail business development and derived products, can meet customer needs and improve business competitiveness on the basis of a plurality .

Abstract: The criteria equation was established by using dimensional analysis; through the method of field experiment measuring the flow parameters of two-phase-flow in the gas-separator in this paper, combining with the criteria equation and experiment data, the mathematical model, which can quantitatively describe the relation between separation efficiency and the gas fluid ratio by using numerical method, is established; and the relational plate is plotted between the separation efficiency and the separation time in the case of different gas fluid ratio, which can provide theoretical foundation for the optimization of the well production parameters and the geometric structure parameters of the oil/gas separator under the submersible electrical pump.

Abstract: The paper is based on surface gas extraction technology from boreholes in the goaf in Zhangbei Coal Mine ,Huainan Mining Group .With the method of numerical simulation ,the authors have made analysis on the space-time cracking and moving law about the overburden of mining field during exploiting by contrasting extraction data about boreholes in Huainan Mining Group .Besides ,paper provides conclusion and advices on promoting the stability of borehole in the end .To some extent ,the paper is of instructive significance for the research ,promotion and application of gas extraction technology from the goaf .