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

Table 7

Gel-breaker profile of the weighted fracturing fluid at 140°C.

Cross-linker	Gel-breaking time (h)	Concentration of ammonium persulfate (wt%)
		0.005	0.01	0.02	0.05	0.1
ZCY-10	2	Not break	Not break	Not break	Not break	Not break
	8	Not break	Not break	Not break	Thin	Gel appeared again
	12	Not break	Not break	Thin	Gel appeared again	Gel appeared again
JDY-1	1	Thin	Thin	≤5 mPa⋅s	≤5 mPa⋅s	≤5 mPa⋅s
	2	≤5 mPa⋅s	≤5 mPa⋅s	≤5 mPa⋅s	≤5 mPa⋅s	≤5 mPa⋅s