Some strategies for improvement of the key technology of testing?adjusting integrated separate injection technology have been investigated, due to much lower efficiency of conventional testing?adjusting integrated separate injection technology, which cannot accomplish layered static pressure testing. Through optimizing the string structure to improve the pressure balance during water injection, the creep of the string caused by the large displacement water injection is reduced. Design of the bridge channel of the water distributor greatly increases the flow area,reduces the interlayer interference, and further improves the testing?adjusting efficiency. Meanwhile, the pressure hole is added in the water distributor body to establish stratum?tubing pressure transfer channel, and the static pressure testing instrument is equipped for further testing of the layered static pressure. The improved technology works well in application, the deployment efficiency has been significantly improved, which takes only 5 hours to complete the deployment of 6 layers. The overpressure layer can be successfully picked out during the layered static pressure test, which provides a basis for the layered injection allocation adjustment. The adaptability of the improved technology in Bohai oilfield is significantly enhanced.

The property and composition of ethylene cracking tar were investigated by four component analyses and the method of ndM. The results were shown that amount of the aromatic hydrocarbon, colloid and asphaltene was higher in the ethylene cracking tar. On the other hand, the delayed coke simulation test was carried on the selfmade apparatus based on the ethylene cracking tar as materials or doping different ratio of the ethylene cracking tar into the coking materials as material under the conditions was that the 500 ℃ and normal atmosphere. The results showed that the fraction of gasoline and wax oil was decreased, but the fraction of diesel oil and coke was increased under the doping ratio of ethylene cracking tar in coke material was increased. Compared with the industrial production device, under the doping ratio of ethylene cracking tar was 20%, the density of gasoline was nearly not changed, the fraction of sulfur and actual colloid were increased slightly, the initial boiling point and dry point of the middle distillate (200～350 ℃) was nearly not changed, however the density of the middle distillate (200～350 ℃) was increased, but the actual colloid was decreased. As for the coke, the fraction of volatile and ash was increased, but the fraction of water and sulfur was decreased apparent. The result mentioned above showed that the doping ratio of ethylene cracking tar was 20% will not affect apparently the production of the delayed coking. 