Fracturing Height Control Technology Research In Glutenite Reservoir

Glutenite reservoir is mainly formed by conglomerate, glutenite and sandy gravel,the classify and the communication is poor. Pore distribution is very uneven, the natural production is low because of the low permeability and heterogeneity, it often needed to get fracturing oil and gas industry. It prone to distortion twist fracture, the construction is more difficult because of the increasing friction. Main types of fracture is micro-fracture, it's poor connectivity makes the fracturing fluid in fracturing fluid loss during the construction of faster, leading to early removal of sand. In addition, the glutenite reservoir generally buried deeper, the vertical of the reservoir span largely and interlaminar stress is small, resulting in the fracture height is easy to get out of control when fracturing. On the one hand, the excessive outspread of fracture height increases the fracture fluid filtration, resulting in the late fracturing sand plug. On the other hand, the formation of "high, short, narrow, " fracture could not reach the requirements ,the fracturing effects is impacted. Therefore, the glutenite reservoir during the fracturing operation, we must pay attention to a high degree of fracturing fluid loss and fracture extension problems.Control of fracturing fluid in glutenite reservoir lost, mainly by silt fluid loss methods, the amount of silt size, medium volume and other parameters is optimized to achieve an optimal effect to reduce fluid loss. Control the vertical fracture height excessive outspread, mainly through the use of adding to the forming artificially layer between the agent method, compartment as the optimization of artificial compressible cake, the relationship between interlayer thickness and the fracture height is established. Calculation obtained in the optimization of artificial interlayer thickness, shift agent in the migration to be three-dimensional distribution of fracture is calculated, the particle size and the amount of steering agents as well as the construction emissions and other parameters is optimized to achieve optimal control of the final effect of fracture height. Application of a well site, compared before and after laying compartment change of fracture height, the height of crack have been obtained effective control, the proposed method to improve the success rate of glutenite formation fracturing has a certain role.