The shielding frequency of cell phone blocker is 800-964MHz

The results (Table 3) show that the three rock samples in 15min when the temporary blocking rate above 99%, with the back row of the pressure increase in permeability to restore value increases, and then gradually leveled off (Figure 2). The reason is because when the backflow pressure increases to a certain value, the cake was destroyed, along with a filtrate flow. When the back row of the pressure increases, the original block in the hearts of rock pore-throat at the solid-phase particles are continuously discharged, smooth flow channels gradually, increasing the recovery rate of return row; flowback pressure continues to increase, the fluid flow rate increases, When the flow rate exceeds a certain value, the flow rate of penetration of the impact on smaller and smaller, back row of the recovery rate gradually leveled off. The shielding frequency of cell phone blocker is 800-964MHz.The initial positive formation water permeability; rock sample recovery rate of 91.94% back row, back row 3 # rock sample recovery rate of 98.55%, breaking the pressure is only 0.02MPa, the best back row. Analysis of the reasons: from the slurry particle size distribution curve (Figure 3) can be seen that the peak in the size, slit width of the rock sample 3 # 50? M, with the peak to match the size, fill fine-grained particles and the relative deformation of particles high levels, mainly in for fast and efficient formation of shielding ring, solid and liquid phase penetrated shallow, so backflow effect. Thus, the modified paste the crack width of the rock sample and flowback temporary blocking effect. The total power of antennae of  cell phone jammer is 12W.Strength test rock samples were crack width. Strength point of view from the mud (Table 4), in the case of increasing pressure, the corresponding temporary blocking rate and no significant reduction in its filtration capacity has not increased significantly, indicating the shielding ring has not been pressure leakage. At 15MPa, its temporary blocking rate above 99%, Aperture small core shielding ring slot width larger than the core strength is good. Analysis of the reasons is because Aperture large rock-like, easy access to the solid-liquid core, the large amount of fluid loss. But overall, the two rock-like strength of the formation of the shielding ring are at least able to withstand the pressure of 15MPa, cementing operations to prevent damage is extremely beneficial. The power of each antenna of cell phone jammer is 3 W.Pressure of the temporary blocking of different experimental results from the temporary blocking (Figure 4) shows that # 6 is pressure in the rock sample only 1MPa, the shielding ring to form the best, temporary blocking rate has reached 100%, then the pressure flowback To 2MPa, flowback recovery rate 77.50%; positive air pressure to 2MPa, the temporary blocking rate of 98.98%, only this time flowback pressure 1.5MPa, back row of the highest recovery rate reached 98.16%. Analysis of the reasons: 6 # rock samples Aperture 11? M, is only 1MPa pressure, the solid-liquid phase enters the core, it is easy to form a shield ring, temporary blocking rate has reached 100%. Positive pressure 2MPa, the mud cake formed, and when the pressure reached 1.5MPa back row, the mobile channel has been established to participate in cracks and pores contribution flowback recovery rate of 98.16%.The power  cell phone jammer is 12W with 3W for each antenna. As artificial joints is greater than the natural width of cracks in the effective stress is more prone to deformation under the effect of closed, artificial joints so the stress sensitivity of the whole core is stronger than the natural minor cracks in the stress sensitivity of the core.