Development and Field Application of a New Ultralow Guar Gum Concentration Weighted Fracturing Fluid in HPHT Reservoirs

Table 4

Base fluid viscosity of different density fracturing fluids under different guar gum concentrations.

Fracturing fluid	Temperature (°C)	Concentration of guar gum (%)	Density (g/cm^3)	Apparent viscosity of the base fluid at 170 s^−1 shear rate (mPa⋅s)	Weighting agent
Base fluid of hydroxypropyl guar gum fracturing fluid	Ambient temperature	0.45	1.0	69	None
		0.5		72
		0.55		86
Base fluid of weighted hydroxypropyl guar gum fracturing fluid	25°C	0.45	1.32	72	Sodium nitrate B
		0.5		96
		0.55		105
	15°C	0.45		87
		0.5		114
		0.55		123