Zhundong Oil Production Plant,Xinjiang Oilfield Company,Petrochina,Fukang
In view of the high solid phase content of oil-containing sludge and the lack of treatment conditions in the ZhunDong oilfield, combined with the need of cracked oil storage wells, three different strength oily sludge profile agents were prepared by adding thickening agents, cross-linking agents and curing agents, and its suspension performance, blocking performance and curing strength were evaluated. The results show that solid-phase particles with oil-containing sludge greater than 40 Mesh in the ZhunDong oilfield can be carried into the formation, and the utilization rate of sludge is more than 90%. 30% oily sludge + 0.3% thickener forms a sludge suspension system with a suspension time greater than 60min. 30% oily sludge + 0.3% thickener + 0.2% crosslinker to form a sludge frozen glue system, in the range of 40 degrees Celsius to 90 degrees Celsius , the strength of the glue is stable, mineralization degree of 50000mg/L, the strength of the glue is basically unaffected, with better stability and shear resistance, core flow experiments show that the system has over 85% plugging rate, and over 6.8 Mpa breakthrough pressure. 30% oily sludge + 0.3% thickener + 0.2% crosslinker + (0.6-0.7) % curing agent to form a sludge curing system, pressure strength 4.6 Mpa. The strength of the three sludge systems is different, and the combined use can achieve effective sealing of crack oil deposits. On-site scale application of 36 wells, cumulative treatment of oily sludge 31186m3, saving sludge treatment costs of 15 million yuan, well group cumulative oil increase of 7956 tons. The purpose of improve the effect of oil field development and oily sludge resource utilization has been realized.