Migration Law Of Temporary Plugging Agent In Wellbore And Optimization Of Construction Technology

For the development of unconventional oil and gas,hydraulic fracturing is generally used to form a complex fracture network and improve production efficiency.Temporary plugging technology can make the fracture turn,improve the uneven development of fracture network and improve the complexity of fracture network.So far,although the field practice has been widely popularized,the mechanical mechanism,migration law,dosage calculation and construction process optimization of temporary plugging in temporary plugging steering fracturing are still in the exploratory stage.In this paper,the action mechanism of different types of temporary plugging agents is studied.Combined with the actual situation in MH area,the migration process of temporary plugging agent in construction is simulated by fluent,and the effectiveness of temporary plugging is judged in combination with the parameters such as cumulative fracture entry and critical outlet concentration.The migration law of temporary plugging agent in the wellbore and the factors affecting the efficiency of temporary plugging are studied.A test well in MH area is selected for analysis,and the construction parameters are optimized.Through the above research,this paper mainly obtains the following three understandings:(1)It is more convenient to introduce parameters such as particle transport efficiency,outlet critical concentration and cumulative receiving quality to describe the transport law of temporary plugging agent and the calculation of temporary plugging efficiency,as well as whether an effective temporary plugging structure is formed in the target area(2)Flow rate,density of temporary plugging agent,particle size of temporary plugging agent,liquid viscosity and sand liquid ratio are the main influencing factors for temporary plugging efficiency.Increasing the displacement will improve the transport efficiency,but the critical concentration will also increase accordingly;Using highdensity temporary plugging agent and increasing the particle size of temporary plugging agent will improve the temporary plugging efficiency of heel perforation cluster;The use of higher viscosity fracturing fluid and higher sand fluid will improve the temporary plugging efficiency.(3)According to the influencing factors affecting the transportation of temporary plugging agent and the formation of temporary plugging structure,combined with the actual situation of the site,the temporary plugging optimization scheme is designed for the construction of field test wells,simulated and fitted with the actual situation of the site,and the causes are analyzed.It provides a certain reference for the follow-up construction of the site.