Evaluation And Experimental Research On ASP Profile Control Agent Performance And Flooding Effect

At present,there are two main series of depth profile control system: the particle profile control agent and the gel profile control.Performance evaluation and plugging effect research on particle profile control agent and gel profile control agent is still in the exploratory stage.Therefore three main research works were launched to aim at the particle profile control agent's performance evaluation,polymer gel system's rheological-law research and gel system's plugging-flooding effect.(1)A characterization method is established by measuring the via-hole breakthrough pressure.The matching relationship between particle size and perforated plate has been given after 96 matching experiments.Variation law of particle's elasticity under different pressures has been given by resilience factor's characterization after 64 elasticity-evaluating experiments.Negative correlation between the via-hole intensity and resilience coefficient is discovered by analyzing within limits.Therefore intensity and elasticity are supposed to be considered synthetically while evaluating the particle profile control agent's performance.(2)The creep recovery,stress relaxation,storage modulus,loss modulus and complex viscosity of gel system were measured by Thermo Scientific HAAKE RheoStress6000 with different gelling time(initial states: 4h,24 h,72h,15d)and concentrations.Results show that there is no obvious creep recovery and stress relaxation in polymer solution.Creep recovery and stress relaxation are able to be enhanced by polymer solution concentration's or gel intensity's increasing.There is a positive correlation between the ratio of storage modulus to loss modulus and complex viscosity.(3)Amidst-ASP and after-ASP profile controlling flow distribution & pressure variation were simulated under the condition of different permeability ranges(3.0,2.6,2.25)by two parallel tube core model.The after-ASP profile controlling flow distribution and pressure variation were contrasted under condition of different injection rates(0.1PV,0.3PV).Research result shows that the injected gel is able to improve flow distribution and plug high permeability layer effectively.The higher permeability differential is,the better flow distribution is improved;the more gel is injected,the better flow distribution is improved.Measurement & evaluation method of particle profile control agent's intensity index – via hole breakthrough pressure and elasticity index – resilience coefficient is established in this research.Gel profile control agent's flowage law and viscosity-elasticity matching relationship are given.Gel profile control agent's plugging & flooding effect is explored on different conditions.Our research enriches and develops the theory of depth profile control.Our research is also instructive importantly to the field ASP depth profile control engineer designing.