Experimental Study Of The Physical Model Depth Profile Of Henan Oilfield

IV 5-11 strata of Northern Shuanghe Oilfield Heterogeneity is seriously Heterogeneitily.The degree of interlayer water driven have greatly differences;the main layer and negation main layer use a suit of injection-production pattern;having great difficult of uses of negation main layer have great difficults.Intake profile of the stratas are uneven; layers have serious interference;the main layer in the way of water-driving to enlarge swept volume and enhance recovery is difficult; synthetical containing water is high; degree of reserve recovery of water-driving is low,injection-production pattern is imperfect;the flow direction is difficulty to improve, the difficult of enhanced oil recovery is seriously great. After many years of water flooding development, at present the oilfield has entered high water cut stage, production decline, local area has problem of injected water along the high permeability zone cross flow, water cut rising fast, How to keep the production growth is becoming more and more important.In recent years, with the technology research of profile control and flooding in Henan oilfield, through the field test, we formed a series of Profile Controlling and enhanced oil technologies, But the test results show that polymer concentration in produced fluid rise to fast, Part of the wells have high pressure rise So, it’s necessary to deepen understanding of deep profile control and flooding system migration, blocking rule in reservoirs.Therefore, research on the technology of profile controlling and water shutoff is Increasingly important.Weak gel profile control technology to improve oil recovery in EOR was applied in major oil fields have been more extensive. Its main role isto apply a different profile control agent technology measures weak gel is injected into the high permeability layer, blocking the main flow channel, flow diversion into the future can be better in low-permeability layer, so to improve sweep efficiency and crude oil washing efficiency. Meanwhile in the formation of a weak gel gel time is longer, to facilitate the long-term profile conducted. Now that the weak gel profile techniques are relatively mature, the cost becomes relatively low, the reservoir’s depth profile in economic terms is very impressive.Through core flow experiments,we study on the injectivity,the resistance coefficient, the shut off capacity and the profile controlling effects of the gel system. Three newly prepared solution of weak gel, when injected into the core, they has a well capability controlling fluid mobility,in porous medium with well injectivity and propagation performance. After gelling in the layer,havingrelatively strong adhesion and toughness,along with Stress deformation capacity,easier access to high permeability layer. Those causing sequel injected waterbend and go into low permeability layer,whichbroaden swept area and raise conformance efficiency.In this paper, at first, we established a proper deep profile control and flooding adaptability research method, selected the most suitable formula for the reservoir (polymer2000mg/L+crosslinking agent 200mg/L), the standard is:high advantage of water seepage flow channel is capped, low and medium permeability channels get used.Second, establish the concrete design scheme of depth profile control physical model experiment, the final choice with 3 root and 1 m long sand filling tube in parallel, each root canal filling sand permeability is different, divided into high, medium and low permeability that can better simulate the real formation heterogeneity. By three tube parallel experiments to examine the plugging of oil displacement system of selectivity and enhance oil recovery effect.The third step is the preparation phase before the profile, including the selection of the appropriate size of quartz sand, and explore the sand filling process, vacuum and experiments measuring the porosity, permeability and saturation.The fourth step is carried out physical model experiments, measuring the basic data, by analyzing the relevant parameter optimization recovery, diversion rate, residual resistance coefficient, the injection radius.The fifth step, the basic parameters by experimental results measured with the actual formation of combined optimization profile used by the radius of the field operations.