Synthesis of a Novel Filtrate Reducer and Its Application in Water-Based Drilling Fluid for Ultra-High-Temperature Reservoirs

Table 2

Testing results of intrinsic viscosity and molecular weights.

Sample	Concentration (g/100 mL)	0.1	0.2	0.3	Average intrinsic viscosity (mL/g)	Molecular weight
HTRTP	Average outflow time (s)	76.13	98.68	123.24	284.06	1040322
	Intrinsic viscosity (mL/g)	279.06	288.29	284.87
DCL-a	Average outflow time/s	79.92	107.69	141.06	339.78	1372721
	Intrinsic viscosity (mL/g)	332.72	341.59	345.04