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In this paper, a multifractal approach to the classification of unknown self affine signals is presented as an improvement over traditional traffic signal. The fundamental advantages of using multifractal measures include normalization and a very high compression ratio of a signature of the traffic, thereby leading to faster implementations, and the abiliiy to add new traffic classes without redesigning...
This paper studies the present state of water and soil loss in the Hubei province. Chinese scholars have analyzed the causes of water and soil loss, and pointed out that both natural factors and human activities are the root causes for these losses. The associated natural factors include the landscape, soil, groundwater and precipitation. Since the climate in this area is subtropical monsoon, heavy...
With the exploitation of oil and gas underground, the engineering has developed toward the direction of deep well, even super deep well, the problem of fatigue of drill string has a great effect to drilling engineering. Resonance is one of the main reasons that induces drill string fatigue. In this paper drill string of deep well is object being studied. The models about axial vibration, lateral vibration...
In presence, going with the exploiture of oil and gas, the engineering has developed toward the direction of super deeper well, the problem of drill-string fatigue has a great effect to drilling engineering. Strong vibration is one of the main reasons. Computer can simulate the system of drill-string, and calculate the problem of drilling movetion. Drill-string of deeper well is object being studied...
Drill string vibration is a very prevalent phenomena, it does great effect to drilling engineering, drill string resonance is the main reason that causes the drill string fatigue. In this paper the drill string is object that is studied, the axial vibration is analyzed for the total system of drill string. The model of axial vibration is established, the rule about axial vibration of drill string...
Drill string vibration is a very prevalent phenomena, it does great effect to drilling engineering, drill string resonance is the main reason that causes the drill string fatigue. In this paper the drill string is object that is studied, the axial vibration is analyzed for the total system of drill string. The model of axial vibration is established, the rule about axial vibration of drill string...
The drilling derrick in the oceanic condition is analyzed in this paper; the model of derrick vibration is built, the vibration of derrick behaves many dynamic situation under the bad condition, the axial, lateral, torsional vibration are studied, the rule of various kinds of vibration is obtained. The software ANSYS is applied in this paper, the result can be used for the actual drill case.
During the engineering of horizontal well, drill string is in the complicated moving state, strong vibration is the main reason that induces drill string failure. Drill string vibrations usually have axial vibration, lateral vibration, torsional vibration and coupling vibration, the drill string near the bottom of well usually vibrates strongly. As an example to G78-E15, the variety of vibration is...
During exploitation of straight well engineer, the problem of drill string failure is very serious; drill string resonance is main reason. In this paper drill string of deep well is object being studied. The models about axial vibration, lateral vibration and torsional vibration are set up. Modal vibrations of drill string are studied. All sorts of resonance frequency are obtained practicability,...
During exploitation of extended reach well (ERW) drilling engineer, the problem of drill string failure is very serious; drill string vibrations are main reasons. In this paper drill string of extended reach well of different part is object being studied. The models about various vibrations are set up. Modal vibrations of drill string are studied. All sorts of resonance frequencies are obtained practicability...
The gray model based on the gray theory is a model of continuous differential equation. We can make a comprehensive observation and a long-range prediction to the variety and development of the safe accident by using this model. This paper mainly introduced the basic theory of the gray prediction, firstly, a prediction model of the drill stem failure in deep well was set up with this theory, and then...
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