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

Table 2

Experiment results of conventional density fracturing fluids using different boric acid.

Sample	Sodium gluconate 2%	Ligand 2%	Boric acid 1%	Boric acid 2%	Crosslinked gel	Apparent viscosity (150°C, 1 h)
Crosslinkedgel 1	16	7	15		Good crosslinked gel without dehydration	215
	16	7	18			232
	16	7	20			289
	16	7	25			408
Crosslinked gel 2	16	7		15		189
	16	7		18		201
	16	7		20		266
	16	7		25		381