Study On Flowing Gel Profile Control Technique To Conventional Heavy Oil Reservoir

The Y district of LiaoHe Oil Field is developed efficiency, now it is at the ending term of development, the liquid from the well get a high percent of water, together with the recovery has many layers and the layers is very anisotropic, the oil is highly viscous, then the development has been getting more and more difficult, it is hard to get a higher degree by traditional water droving, so in this paper we study hard on the week polymer gel, and get the main conclusion as follow:(1) The Y district has a high porosity and infiltration rate, it has many layers and every layer is thin, the connection is good, the main problems exist recently is the contradiction between layers has became serious, we use the dynamic analysis to study the condition of the water logging in oil pool,based on the law of remained oil exist, we make the conclusion that the Y district is fit for the gel driving recovery.(2) According to the oil recovery condition, we design the three segment to make the progress by four steps such as plugging, adjusting driving and rinsing, we chose the polymer and zinc chromium, as the using prescription, we find the best concentration of the system is2000mg/L plyoymer+1500mg/L zinc chromium, we also find the best proportion between the polymer and cross-linking agent is25:1, in the other hand we still do the research on the infection to the gel such as relative molecular mass temperature PH mechanical cutting.(3) we do the research on the pre-segment and find the best concentration is3000mg/L Particulated Crosslinked Polymer+2000mg/Lploymer+1500mg/L zinc chromium, we still do the research on the infection element for expanding of Particulated Crosslinked Polymer, in the other hand,we fund that the polymer concentration of carrying liquid for the Particulated Crosslinked Polymer should not less than1000mg/L.(4) we evaluated the capacity of plugging of pre-segment and main-segment, and proved the capacity of moving gel to adjust the infiltration rate of oil layer, and used the physical modeling to evaluate the cooperative effect of pre-segment and main-segment, we designed the size of the tree segment is0.02PV pre-segment+0.12PV main-segment+0.06PV oil-displacing segment.