In order to improve the effect of polymer flooding, different slugs were injected into the N development zone to optimize the slugs. In this paper, 25 million and 7 million molecular weight polymers of different concentrations were used to conduct indoor oil displacement test on the core, so as to determine the recovery factor, polymer consumption, water cut change and injection pressure change of each combination slug, and optimize the combination of slugs. The results show that high concentration polymer is helpful to the formation pressure holding and oil recovery, and can get lower water cut value and water cut value more quickly. High concentration polymer should be used for single polymer flooding, and at the same time, polymer can also be used for pre slug of combination slug. The same polymer with different concentration and three slug combination can get oil recovery closer to that of single slug. However, with the increase of the injection volume of the high concentration slug, the injection pressure increases obviously.In practice, it is better to consider comprehensively and choose the scheme with higher recovery, lower injection pressure and less polymer consumption.Compared with the single slug and the same polymer combination slug, different polymer combination slugs have more advantages in the comprehensive performance of recovery, polymer consumption, water cut minimum and injection pressure.

The catalytic performance of ZSM⁃5,beta and USY zeolites for the preparation of low⁃carbon olefins from F⁃T synthetic distillate oil was investigated in ACE experimental facility.The effects of temperature,mass oil⁃to⁃solvent ratio and mass space velocity on the catalytic performance of beta zeolites were also investigated.The results showed that the ethylene yield was 4.22%,the propylene yield was 31.08%,the butylene yield was 19.96%,and total light olefin yield (ethylene + propylene + butylene) was 55.24% when the reaction temperature was 620 ℃,the mass of catalyst to oil ratio was 8 and the mass of space velocity was 8 h⁃1.

There are many sand and shale interbed in Daniudi gas field. Although the horizontal well exploitation can realize the maximum utilization of the single layer reserves, it is impossible to exploit several reservoirs in the longitudinal direction. A systematical and significant influencing the Daniudi gas field exploitation technology called layers penetration fracturing that between the pay zone He-1 and Shan-2 has been developed by associate with the characteristic of pay zone. The treatment parameter such as discharging rate and fluid viscosity also researched for the aim of proposing the treatment advice and optimal method in different conditions, in order to form the penetration principle and a technique that could identify controllable factors. Associated with the precise single well stress explanation results and well temperature monitoring, the layers penetration model and principle's reliability have been verified, which presented the steerable layers penetration fracturing treatment and parameter optimization method.