http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-108997508-B
Outgoing Links
| Predicate | Object |
|---|---|
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C09K2208-12 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08B31-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08B31-04 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C09K8-035 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08B31-04 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08B31-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09K8-035 |
| filingDate | 2017-06-06-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2021-12-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 2021-12-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CN-108997508-B |
| titleOfInvention | Modified starch anti-sloughing agent for drilling fluid and preparation method thereof |
| abstract | The invention relates to a modified starch anti-sloughing agent for drilling fluid and a preparation method thereof, belonging to the field of oilfield additives. The modified starch anti-sloughing agent is a natural modified product obtained by reacting starch, a sulfonylation agent and an amination agent serving as raw materials through enzymatic reaction, sulfoesterification reaction and amination reaction. The invention introduces primary amine group into glucose structural unit of starch, which makes starch have stronger ability of inhibiting bentonite slurrying, prevents hydration dispersion and expansion collapse of shale stratum, resists temperature up to 150 ℃, can effectively maintain well wall stability, and has wide source of preparation raw materials, simple preparation method and easy industrial popularization. |
| priorityDate | 2017-06-06-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 41.