Applied Mechanics and Materials Vol. 733

Abstract: By using the potential theory and the superposition principle, Productivity model of multi-fracturing horizontal well is established under the condition of infinite conductivity fractures. It solves the problem by using numerical methods and analyzes the influence of fracture numbers, fracture length and fracture spacing on well production by using actual reservoir parameters. Finally, it analyzes the production decline characteristics of multi-fracturing horizontal well based on the change of production curve. In the early period of production, the well production increases with the increase of fracture numbers, fracture length and fracture spacing. In the late period, the fracture parameters have less effect on well production. Early-stage production of multi-fracturing horizontal well obeys to the modified-hyperbolic decline model, while the relationship between ratio of Q, Qi and time is exponential model in the late-stage. It has some significance for design of horizontal well fracturing parameters and production forecasts in unconventional reservoirs.

Abstract: This paper finds out four kinds of main influencing factors of the comprehensive utilization of iron ore tailings from the historical and realistic perspectives: single view of development of economic growth, views of useless waste, insufficient science and technology, and inadequate management systems, which plays an important role in guiding the development and use of iron ore tailings.

Abstract: This paper concludes what the comprehensive utilization of iron ore tailings is through analysis, and in order to develop and use the iron ore tailings, comprehensive utilization of iron ore tailings shall be the precondition of the iron ore tailing integrated utilization; comprehensive utilization means efficient, clean, and sustainable utilization; which can guiding the development and use of iron ore tailings.

Abstract: In order to improve the drilling speed, lower the costs of development and solve the challenge of economies of scale development in sulige gas field, the key techniques research on long horizontal section of horizontal well drilling speed are carried out. Through analyzing the well drilling and geological data in study area, and supplemented by the feedback of measured bottom hole parameters provided by underground engineering parameters measuring instrument, the key factors restricting the drilling speed are found out and finally developed a series of optimum fast drilling technologies of horizontal wells, including exploitation geology engineering technique, strengthen the control of wellbore trajectory, optimize the design of the drill bit and BHA and intensify the drilling parameters. These technologies have a high reference value to improve the ROP of horizontal well in sulige gas field.

Abstract: In high water cut stage, reservoir heterogeneity is the main cause leading to uneven use of the reservoir and increasing the development difficulty of remaining oil. High capacity channels is a direct result of development differences. The determination of high capacity channels formation conditions has important guiding significance to determine the distribution rule of high capacity channels and make enhanced oil recovery. In this paper, with the data of different periods coring wells, dynamic and static data of production wells, the causes and conditions for the formation of are analyzed, then it’s concluded that unconsolidated rock, high oil viscosity, long-term high intensity of water is the main reason for the formation of high capacity channels, the key condition for the formation of high capacity channels is reservoir properties and heterogeneities, high capacity channels are More easily formed in reservoirs where permeability is between 100-10000,porosity is between 25-30%, Heterogeneity coefficient is greater than 2 and thickness is greater than 3m.

Abstract: Through the cultivation of two polymer-producing strains of WP1, SP1, determined the suitable growth temperature of bacteria, followed by fermented, we research the growth of the strains and metabolite changes on viscosity and pH values. Results show that at 80 r/min, 120 r/min training conditions, viscosity of strain WP1 is all more than 100mPa•s, the strains of experimental works better than SP1. Therefore, selected strain WP1 identified as strains of microorganisms in thick oilfield combination flooding produced polymers, this strain is identified at last.

Abstract: In order to explore the change laws of physical properties and pore throat radius of reservoir both before and after water flooding to guide the oilfield in-depth fluid diversion, the reservoir properties are analyzed on the basis of core data of early exploratory well and inspection well in the middle and later stages of oilfield development. The theory of reservoir geology and development geology is used to study the change laws of reservoir properties both before and after water flooding in May 20th Development Area of Liaohe oilfield. The research result indicates that reservoir physical properties and pore throat radius have changed in the different period and different microfacies types of sand body [1-3].The permeability is changed far outweigh porosity in the physical properties of reservoir. And with the increase of time, the biggest change is the porosity and permeability of distributary channel, the next are margin of channels, mouth bar. The thin layer of channels and distal bar of physical properties have changed lesser or not. The pore throat radius has declined following distributary channel, mouth bar, thin layer of channels and distal bar in the sedimentary microfacies [4-5].The study results are helpful for the establishment of production measures at the later stage of oilfield development.

Abstract: Heilongjiang Jixi Basin is one of the important coal basins, and the CBM exploration is still in its infancy. This study shows that Jixi Basin is large in number of plies, thin in depth, poor continuity; the types of coal give priority to gas coal and coking coal, reaching the limits of angry thermo genic gas, coal seam gas with a large amount of gas supply is sufficient. In the southern basin, coal mainly developed in the range of 300~1200m, burial depth is moderate, and the dip is small, it is more favorable compared with the north.

Abstract: To understand the oil and gas accumulation rules and main controlling factors of H Basin at different phases, approaches such as reservoir dissection and analysis on the spatial allocation of reservoir accumulation conditions are adopted to divide the reservoir of the main fault depression zones of central H Basin into early and late phases. The widely-spread oil and gas at early phase are obviously more than that of the late phase. The main controlling factors of reservoir accumulation at early phase include source rocks area, antithetic faults - tilted upheavals and sand body of fan delta front subfacies while that of the late phase include sources rocks area, inverted structure and long-term developed fractures. The achievement of the study expounded in this paper is significantly important to correctly understand the oil and gas accumulation rules of complicated faulted-block fields and guide the oil and gas exploration activities.