ABSTRACT
Most of the liaohe oilfield development of heavy oil steam stimulation or steam drive
mining way, it will produce a lot of heavy oil wastewater, and along with the change of
heavy oil thermal recovery way and the increase of the length of mining, produced by
the thick oil wastewater quantity rising rapidly, the water quality complicated
composition, high water temperature, viscosity, water density difference is small,
emulsifying serious, biodegradable sex difference, processing difficulty is greater, the
high-viscosity oil wastewater disposal is reasonable oilfield company is faced with a
serious economic and technical problems.
Liaohe oilfield of heavy oil wastewater to in-depth processing so as to meet the
high pressure steam boiler feed water standard, as thermal recovery boiler water supply,
the main treatment process is divided into oil removal, in addition to susended matter, in
addition to silicon and softening four parts. Oil and suspended solids processing
technology has been mature, engineering a investment and processing cost is low. In
addition to silicon technology existence dosing, large amount of silicon mud, the high
cost and the subsequent filter scaling problems such as serious, and all the to remove
silicon process to reduce the amplitude of silicon, can not reach the lower orders of
magnitude, the back of the big hole weak acid fixed bed softening process on metal ion
removal is not complete, the water still exist mg/L level low concentration of metal
ions, the content of residual silicon and low concentration of metal ions lead to thermal
recovery boiler scaling.So the project according to the production and supply of heavy
oil wastewater water quality change, used to remove silicon, the development of new
type of resin, depth adsorption two/three price cation performance, to reach high silicon
containing wastewater reuse the boiler technical requirements, form suitable for thick
oil sewage water depth softening technology.
This project based on the predecessor experiment results of heavy oil wastewater
containing high silicon second/trivalent cations safety concentration threshold for
twenty ug/L and found that the traditional oil field two levels of weak acid resin
softening cannot achieve and the concentration of the ug/L requirements, thus further
developed suitable for thick oil sewage water quality of new resin.
Through the laboratory test and the pilot test get, using macroporous weak acid Na
type resin and macroporous amino acid Na type (chelate) resin combination. Due to the
heavy oil sewage oil material adhesion in the resin surface, the impact of the resin
adsorption calcium magnesium ion of the reaction rate, and the resin the long-term use
of impact. Aimed at this problem, the project development for the thick oil sewage
water quality of new weak acid resin and new chelating resin, in view of the
development of new weak acid and chelating resin, the effects of the depth of the
softening process operation parameters.
Key word :heavy oil wastewater, ion exchange, softening, static
adsorption, technological parameter