http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CA-1038749-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_7851348db19297faa07ed5a450ecbbf3 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/E21B33-12 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/E21B47-00 |
| filingDate | 1978-01-30-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 1978-09-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_b53d75454e7b565d00ca17cd12d372a4 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_4d3cbc3b3e94e643de2682c7803ffe54 |
| publicationDate | 1978-09-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CA-1038749-A |
| titleOfInvention | Pressure operated isolation valve for use in a well testing and treating apparatus, and its method of operation |
| abstract | ABSTRACT OF THE DISCLOSURE An isolation valve for use in a fluid filled oil well bore for controlling fluid communication between the oil well bore and a flow passage in the interior of the valve. The valve comprises: a tubular housing having a central bore there-through; an annular chamber in the wall of the housing; a flow passage communicating with a first end of said annular chamber; a first plurality of ports for providing fluid communication between the first end of the annular chamber and the oil well bore exterior of the valve, a second plurality of ports for providing fluid communication between a second opposite end of the annular chamber and the oil well bore exterior of the valve; and a third plurality of ports for providing fluid communication between the central bore and the annular chamber at a point intermediate the first and second pluralities of ports. A raised shoulder por-tion is provided on the inner wall separating the annular chamber from the central bore, intermediate the third plurality of ports and the first end of the annular chamber. Sleeve valve means, located in the annular chamber and having a thickened shoulder portion intermediate the raised shoulder portion on the inner wall and the first end of the chamber, is provided for moving toward the first end of the chamber responsive to fluid pressure in the well bore external to the valve, and for movement toward the second end of the chamber responsive to fluid pressure in the central bore. Floating piston means is situated between the raised shoulder portion on the inner wall of the annular chamber and said raised shoulder portion of the sleeve valve means, for movement responsive to a pressure differential between the fluid pressure in the central bore and the fluid pressure in the flow passage, wherein the floating piston means abuts against the thickened shoulder portion of the sleeve valve means where the central bore pressure is greater and abuts against the raised shoulder portion on the inner wall when the flow passage pressure is greater. Seal means between the first end of the annular chamber and the sleeve valve means provides a fluid pressure tight seal between the first plurality of ports and the flow passage when the sleeve valve means moves to the first end of the annular chamber. |
| priorityDate | 1975-06-20-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 17.