fluid loss additive,cementing additives,well cementing

Salt-resistant and accelerating type fluid loss additive CG610L can control water loss in supersaturated salt water cement slurry system, shorten thickening time, and develop cement strength quickly, thus meeting the safety requirements of on-site construction.

Difficulties

During cementing construction in highly mineralized oil formations, excessively high salt concentrations lead to a long thickening time for cement slurry and slow strength development. The cementing fluid loss additives currently used in China generally have the defect of poor salt resistance and cannot meet the cementing needs of supersaturated brine cement slurry systems.

Features of the anti-salt accelerating type fluid loss additive-CG610L:

Ø The special molecular structure makes it resistant to high concentration salt.

Ø Short thickening time and fast strength development.

Ø Good compatibility with other additives.

Ø High temperature resistance up to 180℃.

Ø Good system stability, meeting the safety requirements of on-site construction.

Solutions

Properties of Cement Slurry With the Anti-Salt Accelerating Type Fluid Loss Additive CG610L Added In the Supersaturated Salt Water System

Items		Experimental Conditions	Required Values	Actual Values
Slurry density, g/cm³		25℃, atmospheric	--	1.93
Thickening properties	Thickening time of the cement paste, min	60℃/37min, 40MPa	--	＞520min, unthickened
Thickening properties	The thickening time of cement slurry with CG610L, min	60℃/37min, 40MPa	300-420	355
Fluid loss property	Fluid loss, ml	60℃, 8.0MPa	≤25	20
48h compressive strength, MPa		60℃, 40MPa	≥18	21.2
Slurry formulation:Oil well cement(Class G ) 700g, supersaturated salt water 413g (with NaCl’s concentration of 28.6%), CG610L 30.1g (4.3%), CX410L 1.4g (0.2%)

Anti-supersaturated salt water products