A Novel Terpolymer as Fluid Loss Additive for Oil Well Cement

Table 1

Compressive strength of oil cement with SSS/FA/AM under different temperatures.

Curing temperature (°C)	Dosage of SSS/FA/AM (wt%, BWOC)	Dispersant (wt%, BWOC)	Compressive strength (MPa)
			24 h	48 h
90	1	0	22.5	25.7
	2	0.3	20.4	21.1
	3	0.3	19.1	21.0
120	1	0	26.8	24.7
	2	0.3	23.7	20.9
	3	0.3	23.2	19.5
140	1	0	28.5	23.1
	2	0.3	25.3	19.6
	3	0.3	24.9	17.3

Note: BWOC means “by weight of cement.” The dispersant was SXY-2 (Chengdu Chuanfeng Chemical Engineering Co., Ltd., Sichuan, China), that is, a condensation copolymer of acetone and formaldehyde. The chemical structure is exhibited in Figure 9.