Performance Evaluation And Research Of Profile Control Agent In The North Saertu Oil Field

As most of the oil fields in China enter the high water cut stage,The contradiction between layers in the development process,Increasingly prominent contradictions in the plane,Under the influence of long-term water flooding,The formation pore,pore gradually expand,The oil field has a serious "short circuit" phenomenon,Conventional profile control and water shutoff technology can not meet the needs of the field,The phenomenon of water injection coning leads to premature water,decreasing production and low oil displacement efficiency,In order to solve this problem,the technology of profile control and water shutoff at home and abroad to improve oil recovery.In order to screen out the profile control agent suitable for the actual situation of the oil field?s polymer injection tract,this paper analyzes the mechanism of the anionic polymer and compound ion polymer profile control.In this paper,the types of polymer profile control agent and the profile control mechanism and characteristics of anionic polymer profile control agent and compound ion polymer profile control agent are analyzed.The evaluation method of polymer gel properties was determined.And an experiment was conducted to evaluate the gelling properties and the influencing factors of gelling properties of anionic polymer and compound ion profile control agent.Through the experiment to evaluate the concentration of polyacrylamide,six methylene amine four dosage,solution pH,resorcinol content,salinity effect on gel strength.The effects of molecular weight and concentration of polymer,concentration of JL-1,concentration of phenol,concentration of resorcinol,solution pH,salinity and shearing degree on the gelling properties of composite ion profile modification agent were experimentally analyzed.The results show that: anionic polymer and compound ion profile control agent can realize profile control of polymer profile modification agent by adsorption,resistance increase,dynamic capture and viscoelastic resistance.Viscosity method,variable pressure method and resistance coefficient and residual resistance coefficient method can effectively measure and calculate the viscosity,transition pressure and resistance coefficient of the gel system,so as to evaluate the gel system;The gel strength of anionic polymer profile control agent is greatly affected by the concentration of polyacrylamide.The addition of resorcinol,six methylene,four amine,and PH shortens the gelling time and increases the gel strength.For compound ion profile control agent,with the polymer concentration and the concentration of JL-1 increased,the strength of gel was stable condition gradually increased,when the concentration of phenol is changed,the gelling time did not change obviously,the gel strength is little.With the increase of resorcinol concentration,the gelling time of the solution is obviously shortened,and the gel strength is also increased significantly.When the pH value is low,the gel is fast,but the viscosity remains shorter.When p H value is higher,it is difficult to become glue.When the pH value is between 5.10 and 5.15,the gelling property is better.Salinity has no obvious influence on gelling time and gelling strength.Salinity has no obvious influence on gelling time and gelling strength.The greater the degree of shear,the lower the gel viscosity and the lower the strength.