High-Viscosity Polyanionic Cellulose (PAC-HV)
Product: High-Viscosity Polyanionic Cellulose (PAC-HV)
Grade: Regular
Product Description:
PAC-HV, also referred to as API PAC regular grade, is a water-soluble polymer produced only from cellulose chemically reacted with carboxy-methyl (anionic) groups.
The product obtained is further purified to significantly increase the active polymer content.
The product is a free-flowing and/or granular powder. See Table 17 for physical requirements.
PAC-HV is widely used in water-based drilling fluid for a variety of applications, such as filtration control, viscosity and shale inhibition. Although field use can vary, this procedure focuses on filtration-control and viscosity-control characteristics.
Product Physical Requirements:
To obtain the best handling in the field, it is recommended that the particle size for the PAC-HV powder be u 0.8 mm(20mesh).
Technical Requirements:
It shall not contain any other polysaccharides, such as starch, guar or other naturally occurring polymers or their derivatives.
PAC-HV shall be free of any foreign polymer. Therefore, a qualitative starch determination shall be performed before the performance tests. If starch is found, no further testing should be performed and the sample shall be rejected.
Table 17 - PAC-HV Physical Requirements
Requirement | Standard |
Presence of starch or starch derivatives | Absent |
Moisture content | Maximum 10% |
Apparent viscosity | Minimum 50 cP |
API filtrate volume | Maximum 23ml |
