http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-11155742-B2
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_64ec033daa290ae22642d8f6c1933c97 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/E21B21-003 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/E21B21-062 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C09K8-203 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C09K8-05 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C09K8-206 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09K8-05 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09K8-20 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/E21B21-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/E21B21-06 |
| filingDate | 2018-06-22-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2021-10-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_3e319e29b543e1f1e2e3ca2735c9201e http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_c38965dd79a5d9217211adc17b77f6e7 |
| publicationDate | 2021-10-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | US-11155742-B2 |
| titleOfInvention | Drill fluid and method for tunneling |
| abstract | A method for drilling a tunnel through a formation must address environmental concerns. One tunneling method comprises the steps of: preparing a mixed metal-viscosified drilling fluid including bentonite, a mixed metal viscosifier and controlling pH to 8.5 to 9.5 to permit a reaction between the bentonite and the mixed metal viscosifier; adding at least one of: (i) calcium sulfate and (ii) a potassium salt; and pumping the drilling fluid while drilling the tunnel with the pH lowered to 7-9. The amount of mixed metal viscosifier used can be limited such that the weight ratio of mixed metal viscosifier to MBT reaches up to 1:30. In the event that there is a problematic increase in viscosity, a non-toxic anionic thinner can be added to the drilling fluid. One such anionic thinner is a polyacrylate. |
| priorityDate | 2007-03-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 85.