foam injection is widely applied in amounts of fields to drilling, production, and formation protection. sometimes, the application result is disappointing, which is caused by the failure of bubble generation in foam flooding. therefore, it is necessary to seek ways for improving the performance of foam injection. an increased disturbance to the stratum, like the vibration caused by a seismic o...

Blocking the already swept high permeable zone with a biodegradable polymer gel is expected to be a more effective and innovative sweep efficiency improvement (SEI) method. This is because it has no risk of formation damage, and it is expected to show additional oil recovery if the microbes have a MEOR effect. In this study, in order to confirm the effect of this blocking on the SEI, a waterflo...

There are two reservoirs with different temperature and permeability in the Kakkonda hydrothermal system. The shallow reservoir is permeable and 230 to 2 6 0 T , while the deep reservoir is less permeable and 350 to 3 6 0 T . However, they are hydraulically connected each other. Recent drilling of deep wells revealed existence of PreTertiary formation below Tertiary formations and neogranitic p...

Conventional reservoir drill-in fluids used for drilling reservoirs in Weizhou Oilfield encounter rheological problems that result technical such as hole-cleaning openhole horizontal intervals. Hence, novel fluid was developed by optimizing the additive quantity and particle size distribution. Lab tests showed boast high low shearing rate viscosity, provide promising cutting, carrying, suspensi...

Chang 8 oil deposit, developed in Hohe and Jihe oil fields at the southern Yi-Shan Slop of Ordos Basin, is regarded as a kind of typical sand reservoir formation with super-low porosity, poor permeability, strong anisotropy as well as locally natural faults and fractures. The previous studies believed that matrix reservoir has a good permeability, whereas fracture reservoir has a reverse manner...