At low GLR, based on Hagedorn and Brown's method of wellbore pressure calculation, the concept and calculation method of theoretical and actual liquid hold-ups are defined, and the continuous liquid carrying critical production at low GLR is determined by comparing theoretical and actual liquid hold-up rates.
Through analyzing the effect of the vertical locations of horizontal wells on the critical output and gas breakthrough time of the gas cap reservoir, the curve showing the relationship between the vertical locations of horizontal wells and the critical output as well as the gas breakthrough time is obtained in this paper.
This paper studies the relationship between critical production rate productivity perforation and differential pressure in a bottom water reservoir and puts forward the method for determining these parameters and points of attention． This has important significance in working out the development plan in the bottom water reservoirs and guiding the reasonable development of such reservoirs．
Utilize mirror image reflect and potential function's principle of superposition,priority elicit any point's potential function in gas-cap reservoir, then fetch the bottom potential difference and output equation of horizontal well in gas-cap reservoir, therefore we studied the influence of the horizontal well position to production rate of a horizontal well critical rate and gas migration time in gas-cap reservoir, so obtain the horizontal well's reasonable position in gas-cap reservoir.
Furthermore, the correlations of critical rate and gas breakthrough time of oil reservoirs with gas-cap, and critical rate and water breakthrough time of bottom-water gas reservoir are discussed in this paper and presented here.
The methods of determined the oil well best perforation interval and critical rate are investigated. And the article analyses the all kinds of insufficiency of the methods in existence, presents an optimization model, which can determines the best perforation interval and critical rate considering the more factors.