The Application Of Freewater Knockout Facilities In The Daqing Oilfields And The Construction Of Mathematic Models

In this paper by the study of gathering and transporting process system, two types of treating systems have been taken, i.e. "north 13 model" and "la 360 model". The "north 13 model" is suited to pure polymer flooding fields and the "la 360 model" is suited to the fields of the mixture of the water flooding and the polymer flooding.By the study of coalescences test of FWKO, a new type of coalescence called ripple-type packing has been developed. This type of coalescence is a combination of gathering function and gravity separating function which possess the advantages of simple in shape and high efficiency in use. The use of ripple-type packing in FWKO can improve the removing the free-water efficiency of .the FWKO.In according to the study of FWKO, the overall arrangements of FWKO have been improved. It makes the FWKO more suitable for the use of treating of produced fluids.By the use of oil-fields, the research results have been improving and process parameters have been taken for the different oil-fields to achieve the required treating parameter to treat the produced free-water. Through the application of oil-field it has showed that the FWKO developed are satisfied to the continuous needs of treating the produced fluids of polymer flooding, the parameters treated have reached to the pre-designed values. The reached values are :inlet water cut 60~90%, operating temperature: 38~42℃, settling time: 20min, added dose: Fpw-320 20mg / L or Sp169 30~40mg / L, the treating results for treating produced fluids are: water cut in oil: < 30%; the oil in water :<2000 mg / L. In the same a series of FWKO suited for treating produced fluids of polymer flooding have been developed.By the analyzing and test of oil-fields, the models of FWKO have been taken. It takes the bases for the large scale uses of FWKO to set the guarantee.This study shows that the FWKO developed is able to meet the requirement of polymer flooding in Daqing oilfield. The applications of FWKO in Daqing oilfield have saved 36.0 millions yuan of the constructing fees. In each year, 93.27 millions yuan of the running-fees. The technique of polymer flooding has been widely used in NO.1, NO.2, NO.3, NO.4, NO.6 main oil extracting fields, So a vast quantity of money have been gained for the daqing oilfield company.