Study on Injection-Production System Adjustment of Fault Block Reservoir Based on Equilibrium Displacement

This paper proposed a method of injection-production system adjustment to solve the problem that the water flooding effect was restricted because of the horizontal and vertical contradictions during the development process of fault block reservoirs. Considering the heterogeneity of reservoir, the Buckley-Leverett water flooding theory was applied to establish the relationship between the recovery and cumulative water injection. In order to achieve the goal of vertically balanced recovery of each section, the calculation method of vertical sectional injection allocation was proposed. The planar triangular seepage unit was assumed and sweep coefficients of different oil-water distribution patterns were characterized using multi-flow tube method. In order to balance and maximize the plane sweep coefficient, the calculation method of plane production system optimization was obtained. Then the injection-production system stereoscopic adjustment method based on equilibrium displacement was proposed with vertical sectional injection allocation and plane production system optimization. This method was applied to injection and production adjustment of BZ oilfield in southern Bohai. The effect of water control and oil increase was obvious. This method can greatly improve the effect of water flooding of offshore fault block reservoirs with the adjustment of injection-production system.

Institutional changes of China's drug regulation and improvement solutions

Drug regulation is the most important policy to ensure drug safety.In this article,we analyzed institutional changes and problems in China＇s drug regulation.In addition,suggestions were provided to enhance the capacity of drug regulation,including a clearer functional positioning for drug regulation,increased resource inputs in drug regulation at central level,a more rational allocation of vertical drug regulatory functions,and an improved supervision mechanism for regulatory departments.

Sub-Provincial Fiscal Expenditure Decentralization Structure:A Case in China

This paper uses the data from the post-1994 tax reform in China to investigate the vertical and spatial structures of sub-provincial fiscal expenditure decentralization(SPFED)in China.The study shows that,on the whole,SPFED tends to be gradually biased toward the county level,but inter-provincial differences are obvious,and the provincial centralization is more obvious in less economically developed regions.In terms of expenditure items,the province level enjoys a relatively higher level of economic expenditure decentralization(EED),and the county level enjoys a higher level of social expenditure decentralization(SED).In terms of internal structure,the difference in the level of EED shared by the province,prefecture and county levels is relatively smaller and the difference in the level of SED is relatively larger.In terms of spatial structure,in less developed regions,the province level enjoys a higher EED but a lower SED;in developed regions,the prefecture and county levels enjoy a higher EED but the prefecture level enjoys a relatively lower SED.These findings can provide empirical evidence for the reform of the division of power and expenditure responsibility,as well as the governance of sub-provincial governments.