Laboratory Experimental Research On The Effect Of Profile Modification In Niuxintuo Oilfield

Niuxintuo oilfield is located in the west of Liaohe basin, the current productionlevel hasreached17.49%. At present, the water in the old liberated area is rising with the newreplacement problem, injection production well network have been damaged at a certaindegree, water flooding effect is not ideal, the using of the low permeability layer have beenmore difficult, reserves have not been effective development. The continued deterioration ofwater injection profile increased inter layer,layer development contradictions, making theyield decreased obviously. The effect of increasing oil production is limited continue to takethe water flooding development. For water flooding development process of low permeabilitylayer use more difficult phenomenon, through some water plugging and profilecontrolmeasures as well as the deep profile control technology, can improve thewaterabsorption and output two profiles, alleviate the inter layer and interlayer contradictions. It isnecessary to carry out related research.Through indoor physical simulation experiment, according to the problem that faces indevelopment of Niuxintuo oilfield water flooding, combined with geological characteristicsand water conditions in Niu Xintuo oilfield.(1) The experimental results show that the influence of adjusting the concentration ofpolymer on gel system was directly and effectively while the gelling viscosity of the floodingagent was fixed between1000mPa·s and13000mPa·s.(2) Test of core gelling time on6kinds of modifying and flooding agent system wascompleted. The research on the pressure of the6kinds of modifying and flooding agentsystem and the situation of recovery efficiency. By the tests on oil displacement agent systemwith6kind of different gelling viscosity, we can know that the gelling viscosity of themodifying and flooding agent get increased from3000mPa·s to9500mPa·s and theefficiency of recovery got increased too. Modifying and flooding agent with a9500mPa·sgelling viscosity made the efficiency of recovery got increased obviously as high as15.18%.(3) Test on the mobility and scouring resistance ability of the modifying and floodingagent system was completed in order to study the influence on oil displacement efficiencywhich was caused by different injection condition. The optimal injection rate determined to be20mL/h because of the results of the test on the influence of modifying and flooding agentinjection rate on the oil displacement efficiency. Due to the results of the test on the influenceof PV on the oil displacement efficiency，the best PV should be0.03PV.Finally，by researching the gelling property of weak gel modifying and flooding agent information condition，dynamic regulation based on the need of recipe of modifying andflooding agent and the construction parameter should be carried out during the site operationprocess in time in order to improve the operational efficiency of modifying and flooding.