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气井
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  gas well
A model of a gas well containing liquid is considered, the nature of the steady-state regimes is investigated, and the causes of cyclical output are analyzed.
      
Solar multi-spectral radiometric observations of atmospheric optical thickness over pasarlapudi gas well blow-out site in india
      
Multi-spectral observations of solar radiation using a Volz sun-photometer have been carried out during February 24-March 2, 1995 in the vicinity of the blow-out of the gas well at Pasarlapudi, Andhra Pradesh, India.
      
Investigating the thermal interaction between a gas well and permafrost soils
      
We present a method, a description of the algorithm, and the results from the calculation of the thermal fields about a gas well drilled through permafrost soil.
      
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Aiming at the character that gas well isochronal testing consists of many drawdown and build-up cycles, the flowing and build-up pressures are regarded as contunuous action process. According to the superposition principle, the formula of dimensionless pseudopressure is derived,the new comprehensive interpreting typical curve is developed, and its character is discussed. It is illustrated that the new way is easy to explain early stage pressure data,and remove non-unique of matching to improve interpretation...

Aiming at the character that gas well isochronal testing consists of many drawdown and build-up cycles, the flowing and build-up pressures are regarded as contunuous action process. According to the superposition principle, the formula of dimensionless pseudopressure is derived,the new comprehensive interpreting typical curve is developed, and its character is discussed. It is illustrated that the new way is easy to explain early stage pressure data,and remove non-unique of matching to improve interpretation accuracy.

针对气井等时试井一般由多个开关井测压周期组成的特点,将每个测压周期流动压力和恢复压力看成是连续作用过程。根据叠加原理,得到了测压周期的无量纲拟压力表达式,研制了新型综合解释典型曲线,讨论了典型曲线特征。用实例解释说明了新型典型曲线拟合法的应用步骤,表明该方法不仅易于解释早期压力资料,而且能消除拟合的不唯一性,可提高解释精度。此研究工作对于低渗透致密气藏试井解释具有重要的实际意义。

In this paper, the representative types and shapes of hydraulic fractures in seam are analyzed; an identification method of both the horizontal and vertical fractures is presented, a mathematical formula is derived for the calculation of the depth at which a horizontal fracture is transformed into a vertical one, and several fracture shapes and their corresponding formation conditions are then described. The basic mathematical formulas are derived, from the point of view of the fracturing mechanics principle,...

In this paper, the representative types and shapes of hydraulic fractures in seam are analyzed; an identification method of both the horizontal and vertical fractures is presented, a mathematical formula is derived for the calculation of the depth at which a horizontal fracture is transformed into a vertical one, and several fracture shapes and their corresponding formation conditions are then described. The basic mathematical formulas are derived, from the point of view of the fracturing mechanics principle, for the three kinds of 2-D models in terms of fracture geometrical sizes at a certain pumping volume and time . The present paper presents an important theoretical basis for the extraction of coal seam methane by means of hydranlic fracturing.

分析煤层气井水力压裂时裂缝的典型类型与形状,建立水平缝与垂直缝的判别方法,推导由水平缝向垂直缝转变的临界深度计算公式。描述几种常见裂缝的形状和相应的形成条件,从断裂力学基本原理出发,分别推导在一定注入泵量和注入时间下,3种二维模型裂缝几何尺寸的基本计算公式。为水力压裂开采煤层气提供重要理论依据。

The Permian and Triassic carbonate rock in south-west Sichuan region is one of themain producing area for natural gas, the reservoir space is mainly of pores,and fractures areof the passage ,and the interconnection is poor. It is proven by actual drilling that there existanumber of subsurface faults and gas obtained along the faulted zone,but it is not certainwhether adjacent gas wells to be mutually interconnected or not making a selfrespective gaspool in many cases. The author has conducted a detailed study...

The Permian and Triassic carbonate rock in south-west Sichuan region is one of themain producing area for natural gas, the reservoir space is mainly of pores,and fractures areof the passage ,and the interconnection is poor. It is proven by actual drilling that there existanumber of subsurface faults and gas obtained along the faulted zone,but it is not certainwhether adjacent gas wells to be mutually interconnected or not making a selfrespective gaspool in many cases. The author has conducted a detailed study for wells in drilling throughfauIts in these two systems (P,T) in this region before 1991. Based on different stratigraphicalhorizons of dislocation and differnt contacts of lithologies, there may be nine different typesof faults for both Permian and Triassic,and it is proved that only the fault which cut off thePermian Maokou formation is better worthy of exploration for fractured gas pools in a fault-ed zone,the success ratio rnay be above 47% ,the other fault types are all undesirable.

川西南地区二、三叠系碳酸盐岩是该区天然气的主要产层之一,储集空间以孔洞为主,裂缝为通道,连通性较差。实钻证实,并下存在有较多断层,沿断带常常获气,但其与相邻气井则不一定彼此相互连通,而自成一气藏。对该区1991年前在该两系钻遇断层的井进行了研究,按断错不同层位、不同岩性接触,二、三叠系俱可分为九种不同类型的晰层,研究证明只有将二叠系茅口组断开的断层才对断带裂缝气藏具有较好的勘探价值,成功率可达47%以上,其余类型断层均不理想。

 
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