productivity coefficient
1.According to the data of comparative productivity, dualism-based comparing coefficient and contrasting indices, the author, after analyzing the situation of the dualistic economic structure since reforming and opening-up in Henan Province, finds out that it is in rigidity condition.
3.The effects of high pressure and reservoir rock stress sensitivity on super-high gas reservoir productivity are considered, the new productivity equations are deduced and the method for determination of the coefficient and the absolute open flow potential or deliverability are presented.
4.In order to study effects of various factors on gas well productivity, this paper takes Changqing Gas Field as an example and uses gas reservoir engineering and numerical simulation methods to qualify effect of different factors on absolute open-flow capacity in different reservoirs in respect of formation coefficient, water production, non-Darcy flow coefficient, formation pressure and skin factor.
5.This paper takes account of the change of parameters that have big impact on gas well productivity equation according to relative theory and calculation method of abandonment formation pressure of gas well. Combining with gas well test in Yulin gas field,a binomial coefficient equation has been derived for Yulin gas wells at any moment,and a stable binominal equation of gas well abandonment is obtained.
6.Results show that water pollution of Hailing Bay is slight,the values of the environmental factors are not remarkably changed during flood tide and ebb tide,primary productivity is controled by present phosphorus instead of by past nitrogen,water eutrophication status is between oligotrophic and mesotrophic,corrlalion between chlorophyll-a and key environmental factors is quite good(relative coefficient R is above 0.81).
7.THe cane yield of Mintang 87-912 was 15.1% higher than the check, and the yield increase was below the significant level while the regression coefficient b<1. It was a middle-late season variety with abundant and stable productivity. ?
