Analysis Of Monitoring Interpretation Methods For Multi-fracturing Tracer

Hydraulic fracturing is a common mining method for low-permeability and tight reservoirs.After fracturing,the law of seepage flow is complicated.The relationship between fracture parameters,reservoir physical properties,and production levels during mine application is critical.Fracturing tracing monitoring is one of the intuitive technical means to judge the fracturing effect and evaluate the staged fluid production status.At present,theoretical research and mine application are in the ascendant.In order to construct a multi-stage fracturing tracer monitoring and interpretation analysis method for straight wells,the mass transfer and diffusion law of the fracturing tracer,the dynamic law of flowback concentration and the main controlling factors of production were carried out.By establishing a numerical model for the simulation of the fracturing tracing process,the law of mass transfer and diffusion seepage in the fracturing tracing of vertical wells was clarified;a numerical simulation scheme was designed around key formations and fracture parameters to study the dynamic change law of the backflow concentration of the fracturing tracer A parameter sensitivity evaluation system is proposed,which evaluates and analyzes the sensitivity of various factors to the dynamic performance of the fracturing tracer output in vertical wells.The theory and the mine are combined to summarize the main control of the fracturing tracer output dynamics.factor.Main knowledge gained:(1)The mass transfer and diffusion law of the fracturing tracer in a single fracture is controlled by the formation fracture,additive process,and physicochemical parameters.The output concentration is single-peak type,affected by migration distance,adsorption,and diffusion The indicators such as peak output concentration of liquid additive and cumulative recovery rate are significantly better than those of pre-liquid additive.The peak output concentration of the two is nearly two orders of magnitude different,and the cumulative recovery rate is different by one order of magnitude.(2)The influence of formation parameters,fracture parameters,and process parameters on the output of fracturing tracer is clarified;the results show that the shorter the fracturing fracture,the greater the opening,the stronger the conductivity,the peak concentration of tracer output,The higher the cumulative recovery rate;the tracer output concentration peak of the single fracture and the cumulative recovery rate are higher than the fracture network;the formation permeability is high,which is beneficial when the liquid injection is preformed;the formation has a high initial water content,which is beneficial to fracturing traceback row.(3)From the perspective of single-stage fracturing tracing,there are relatively many main factors controlling the production dynamics of pre-fluid additives,including formation permeability,fracture opening,fracture conductivity,and the main dynamics of sand fluid additive production dynamics.There are relatively few control factors,mainly fracture conductivity;but from the perspective of multi-stage fracturing and tracing,considering the blending of tracer in the wellbore,the formation permeability and fracture parameters related to productivity are sensitive factors,Need to continue to improve in follow-up research.