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

Table 1

Characteristics of the conventional density fracturing fluid using different crosslinking ligands.

Sodium gluconate 2%	Ligand 2%	Boric acid 2%	Crosslinked gel	Apparent viscosity (150°C, 1 h)
15		15	Low-viscosity gel	Quickly decreased
20		15	Good crosslinked gel	Quickly decreased
25		15	Good crosslinked gel	36cp
25		20	Gel is brittle and dehydrated	65cp
25		25	Gel is brittle and dehydrated	130cp
	15	20	Low-viscosity gel	Quickly decreased
	20	20	Good crosslinked gel	Quickly decreased
	25	20	Good crosslinked gel	Quickly decreased
	25	22	Good crosslinked gel without dehydration	33cp
	25	25	Good crosslinked gel without dehydration	52cp
16	7	20	Good crosslinked gel without dehydration	266cp
16	7	25	Good crosslinked gel without dehydration	381cp