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As a reliable and flexible electric power source, hydropower can quickly adjust its generation level and provide reserve power to balance the power fluctuations in the system. In this paper, we assume that the day-ahead spot market is cleared and the obligation for each reserve type is already contracted in a preceding market. Then the question is how to make the optimal decision to determine, for...
The Firm energy of generation plants is a critical component in some electricity markets. It is usually calculated by the regulator and sets a cap to the amount a plant can trade in capacity markets (or auctions), in order to avoid free-riding behaviors. Firm energy is a systemic property and, in case of hydro plants, a synergy is observed whenever a cooperative operation occurs, i.e., the firm energy...
The Logging data of Kelamayi Oilfield are used to calculate the rock mechanical parameters, such as cohesion, angle of internal friction, elastic modulus, Poisson ratio and maximum level principal stress in this paper. Then the methods of sand factor, combination modulus, acoustic time and Schlumberger are applied to forecast sanding and calculate the critical drawdown pressure. Calculation results...
Low resistivity hydrocarbon reservoir is a special and concealment oil-gas layer, it is always misjudged as water layer because of it complex geological origin and the inherent limitations of resistivity logging to identify it. For difficulty to recognize the N1 reservoir low resistivity hydrocarbon reservoir of Shizigou oilfield of Northwest Qaidam basin, on the basis of origin study of the low resistivity...
As an unconventional gas resource, shale gas is an practically alternative energy. Through the analysis of the current situation of shale gas development at home and abroad, this paper ascertains the influencing factors of the development prospect of the shale gas mainly from the aspects of the potential of the shale gas reservoirs, the controlling factors on the development technology of shale gas...
In this paper, a stochastic mixed-integer linear programming approach is proposed to find the optimal operations planning of a hydro producer acting as a risk-neutral price-maker trading in the day-ahead market based on a pool. The proposed approach optimizes a set of scenarios using as decision variables the amount of power supplied by each generation unit facing the 24-hours residual demand curves...
To effectively control the phenomenon of channeling and improve injection water utilization ratio, it is needed to distinguish the inefficient circulation areas where have channeling paths. Based on water drive reservoir characteristics and influential factors, the reservoir evaluation index system is formed including static and dynamic parameters. Quantitative grading, weights of factors and grading...
The geological model is established with Software Petrel. Then by Eclipse, numerical simulation is done. The development index of block well pattern and remaining oil change condition of well pattern are forecasted. At the same time, comparisons are done between theoretical relationship curve and actual data curve of recovery extent and water cut for the whole block and sublayers. Adaptability is...
For multilayer sandstone reservoir 1, high permeability water passage would be formed between oil well and water well at the later stage of water drive. This caused the injected water circulation with no or low efficiency and thus decreased the production of oil wells. In order to improve the effect of water drive, measures of profile control and/or water shutoff must be taken. The key problem is...
Thermodynamic essence of reservoir driving process is studied, which is a typical exergy transfer problem that uses multi-potential fields as driving source to achieve the purpose of oil displacement. The discrimination of reservoir driving mode is derived on the basis of the establishment of driving potential field exergy transfer, which includes driving work (exergy), driving power (exergy flow...
Regional exploration, trap exploration and reservoir evaluation exploration are three phases of an exploration process. Each phase confronts a problem of evaluating and ranking many exploration projects, and then selecting the optimal ones. The projects of different phase are quite different from each other, so evaluation and ranking methods must be chosen on the base of the divergence of each exploration...
In this paper a BISR architecture for embedded memories is presented. The proposed scheme utilises a multiple bank cache-like memory for repairs. Statistical analysis is used for minimisation of the total resources required to achieve a very high fault coverage. Simulation results show that the proposed BISR scheme is characterised by high efficiency and low area overhead, even for high defect densities...
When drilling into a petroleum reservoir, the geological properties of the reservoir might require that the well pressure is kept slightly below the reservoir pore pressure. This leads to a migration of reservoir fluids from the reservoir into the oil well. The amount of reservoir fluids flowing into the well is dependent of the reservoir parameter named production index. This paper evaluates the...
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