http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0736666-A3
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_f9b403ca659d6ab7ac30de1ebb09af3d |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/E21B33-1277 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/E21B49-006 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/E21B43-26 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/E21B47-08 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01N3-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/E21B43-26 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/E21B47-08 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01L5-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/E02D1-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/E21B49-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/E21B33-127 |
| filingDate | 1996-04-03-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_9a7914be17ea1c1a4b34891c9427f456 |
| publicationDate | 1998-01-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | EP-0736666-A3 |
| titleOfInvention | Method and apparatus for determining the stress state and material properties |
| abstract | A method and apparatus for measuring ambient stress states andnmaterial properties in underground media includes a borehole probe having ancylindrical tube formed of soft, elastic polymer material secured about a centralnmandrel. An upper end cap assembly removably secures the probe to a servicenmodule to provide high pressure hydraulic fluid and sensor connections. Andistal end cap seals the tube to the mandrel, so that hydraulic pressure causesndiametrical expansion of the tube. The end cap includes an annular seal formednof elastic polymer material and helical springs are embedded therein in thencircumferential direction. The interiors of the helical springs are filled withnsteel pins or balls to prevent deformation of the springs. High strength fibersnare bonded in the outer surfaces of the annular seal and oriented longitudinallynto permit radial expansion of the seal assembly without hydraulic leakage ornextrusion of the soft polymer of the cylindrical tube. An inner laminar layerncomprised high strength fiber extending circumferentially about the tube andndefine a datum plane extending through the axis of the tube, so that the tube isnexpandable only in one diametrical direction. An outer laminar layer ofnbraided steel wire mesh limits longitudinal expansion of the tube and providesna high friction outer surface for the tube. A plurality of LVDT sensors arenaligned with the direction of diametrical expansion and spaced longitudinally.nHigh pressure hydraulic fluid expands the outer tube, to drive the high frictionnouter surface is into the borehole wall, consolidating the borehole boundary.nThe fracture pressures at various angles are recorded, and analyzed to yield thenprincipal stress vectors and material properties of the underground media. |
| priorityDate | 1995-04-03-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 23.