A Study On Feasibility Of Reusing Reserved HPAM In Chemical Flooding Produced Water

Polymer flooding technology is widely used by Domestic oil fields to enhance oil recovery, displacing agent mother liquor is prepared by running water and diluted by produced water. Due to high salinity produced water, viscosity of displacing agent declines. In addition, the polymer makes the produced fluid emulsion stability increased and causes difficult oil-water separation. In this view, polymer produced fluid is handled with ARK-88 comprehensive treatment agent, and remnant polymer is reserved. In order to achieve reduction of polymer input, resource recycling, we study the feasibility of displacement. In this paper, water-related factors such as types and contents of metal ions,dissolved oxygen, suspended particles,bacterium which influence viscosity and degree of polymer solution are systematically studied and water quality controlling targets and the limits is put forward.Through the stratum transport hydrolysis degree shift from 25% to 32%, average molecular weight fall down from 15 million to 2 million. Changing the measurement conditions such as temperature, shear rate and the system environment such as pH and water quality, polymer was re-equipped and the change of initial viscosity and viscosity stability is studied. As a kind of injection water polymer reversed water is obtained by dealing produced fluid, under the same condition of mother liquor, the initial viscosity of polymer reversed water system is 3mPa·s higher than tap water system, and the system also possesses strong viscosity stability. Different type viscosity stabilizer is added, the results show that the initial viscosity of polymer systems increased by about 3-8mPa·s and the viscosity stability is also enhanced. The research determines the suitable scope and conditions of reversed polymer water, which provides technical basis information for oilfield produced wastewater reuse, recharge and emission reduction. This paper briefly described the mechanism of viscosity addition and stability. Comprehensive study concluded that it is feasible for reversed polymer water instead of tap water on technology, environmental protection and economy.