Novel modified cellulosic polymers as drilling fluid additives with improved properties
✍ Scribed by Zhang, Li-Ming; Tan, Ye-Bang; Li, Zhuo-Mei
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 96 KB
- Volume
- 48
- Category
- Article
- ISSN
- 0959-8103
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✦ Synopsis
Novel modi®ed cellulosic polymers with amphoteric character were prepared by grafting 2dimethylaminoethyl methacrylate (DM) and 4-vinylbenzene sulphonic acid sodium salt (VB) onto sodium carboxymethylcellulose (NaCMC), and characterized by IR and composition analyses. Their properties as drilling-¯uid additives in oil®elds were investigated with respect to shale inhibition, ®ltration control and viscosity enhancement. It is found that the grafting of DM enhances the shaleinhibition effectiveness and that the grafting of VB increases the tolerances to salt and temperature. Different from commonly used anionic and cationic polymeric additives, the modi®ed cellulosic polymer with suitable structural parameters has both good shale-inhibition and mud properties.