Wang Shaofei, Wang Zhouhua, Zhang Yaling, et al. A new cognition of the reduction of retrograde condensation damage in gas condensate wells by fracturing[J]. Petroleum Reservoir Evaluation and Development, 2018, (2): 30-34. DOI: 10.13809/j.cnki.cn32-1825/te.2018.02.005.
the fracturing can improve the reservoir single well production
however
whether it can reduce the retrograde condensation damage in gas condensate wells or not is urgent to be discussed further. By adopting the indoor core laboratory and single well numerical simulation method
we analyze the impacts of retrograde condensation on the gas phase permeability
the retrograde gas condensate saturation near the wellbore zone
the single well production and the recovery ratio before and after fracturing. The research shows that
after fracturing
the retrograde condensation damage is more serious and the damage time is earlier. However
the fractures reduce the condensate oil critical flow saturation. In the process of the depletion exploitation
the effective permeability value of the fractured gas phase is always larger than the value before fracturing. In addition
the gas phase flow ability increases substantially. After fracturing
the gas recovery speed of the single well is fast
the formation pressure reduces rapidly and the retrograde condensation damage is more serious. Furthermore
the recovery ratio of the condensate oil reduces by 3.48 % and the recovery ratio of the natural gas improves by 6.6 %. Accordingly
it concludes that
fracturing can’t effectively reduce the degree of the retrograde condensation damage
but it can improve the flow ability of the gas phase and the gas production of the gas condensate wells.