APl Specification 13A 18th Edition, August 2010
Specification for Drilling Fluids-Specifications and Testing
LOW-VISCOSITY POLYANIONIC CELLULOSE (PAC-LV)
Product : Low-viscosity polyanionic cellulose (PAC-LV)
API Specification 13A-17 1.1
PAC-LV, also referred to as PAC low-viscosity grade, is a water-solube 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 free-flowing and/or granular powder.
API Specification 13A-17 1.2
PAC-LV is widely used in water-based drilling fluids 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 characteristics.
Product Physical Requirement:
API Specification 13A-17 1.7
To obtain the best handling in the field, it is recommended that the particle size for PAC LV powder be u 0,8 mm (u 20 mesh)
Technical Requirements: API Specification 13A-17 1.1
Product Rejection: It shall not contain any other polysaccharides such as starch, guar or other naturally occurring polymers or their derivatives.
API Specification 13A-17.1. 4
PAC-LV shall be free of any foreign polymer. Therefore, a qualitative starch determination shall be performed. If starch is found, no further testing should be performed and the sample shall be rejected.
API Specification 13A-174 1.2 Footnote 13
API standard evaluation base clay is an example of a suitable product available commercially. Requests for clay should be directed to the API which will forward the request to a supplier for further handling. This inform convenience of users of this Internal Standard and does not constitute an endorsement by ISO of this product.
Table 16-PAC-LV physical requriements