Experimental Study of the Damage of Fracturing Fluid

Hydraulic fracturing is an effective way to stimulate the production rate for reservoirs with low permeability. However, the infiltration of the fracturing fluid will damage the permeability of the reservoir matrix and the conductivity of the proppant pack. The commonly used HPG and CMHPG were selected to study the gel-breaking performance of the fracturing fluid with different mass concentration, and further to study the damage to the matrix and the proppant pack. Results showed that: The gel-breaking performance of CMHPG is better than that of HPG, the viscosity and the residue content of gel broken solution are significantly reduced; the solid phase damage is the main factor that causes the matrix damage. The smaller the reservoir permeability, the greater the damage rate caused by the fracturing fluid; the greater the amount of the thicker, the greater the amount of residue in the broken gel, and the greater the damage to the conductivity of the proppant pack.