[특허]Single fracture method and apparatus for simultaneous measurement of in-situ earthen stress state and material propertie

[미국특허] Single fracture method and apparatus for simultaneous measurement of in-situ earthen stress state and material propertie 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01N-033/24 E21B-047/00 G01V-001/00
출원번호	US-0415196 (1995-04-03)
발명자 / 주소	Serata Shosei (3640 Ridgewood Way Richmond CA 94806)
인용정보	피인용 횟수 : 121 인용 특허 : 8

초록 ▼

A method and apparatus for measuring ambient stress states and material properties in underground media includes a borehole probe having a cylindrical tube formed of soft, elastic polymer material secured about a central mandrel. An upper end cap assembly removably secures the probe to a service module to provide high pressure hydraulic fluid and sensor connections. A distal end cap seals the tube to the mandrel, so that hydraulic pressure causes diametrical expansion of the tube. The end cap includes an annular seal formed of elastic polymer material and helical springs that are embedded therein in the circumferential direction. The interiors of the helical springs are filled with steel pins or balls to prevent deformation of the springs. High strength fibers are bonded in the outer surfaces of the annular seal and oriented longitudinally to permit radial expansion of the seal assembly without hydraulic leakage or extrusion of the soft polymer of the cylindrical tube. An inner laminar layer comprised of high strength fiber extending circumferentially about the tube defines a datum plane extending through the axis of the tube, so that the tube is expandable only in one diametrical direction. An outer laminar layer of braided steel wire mesh limits longitudinal expansion of the tube and provides a high friction outer surface for the tube. A plurality of LVDT sensors are aligned with the direction of diametrical expansion and spaced longitudinally. High pressure hydraulic fluid expands the outer tube, to drive the high friction outer surface into the borehole wall, consolidating the borehole boundary. The fracture pressures at various angles are recorded, and analyzed to yield the principal stress vectors and material properties of the underground media.

대표청구항 ▼

An apparatus for measuring stress state and material properties in underground media surrounding a borehole, including; a tubular central mandrel extending along an axis of symmetry common to the apparatus and borehole; a tubular expansion member disposed concentrically about said mandrel; means for delivering high pressure hydraulic fluid through said mandrel to inflate said tubular expansion member and impinge on and deform the wall of the borehole; means for joining said tubular expansion member to said mandrel to retain high pressure fluid within said tubular expansion member; means for defining a datum plane of said apparatus, said datum plane passing through said axis; means for directing expansion of said tubular expansion member in a direction orthogonal to said datum plane; sensor means for measuring the expansion of the outer surface of said tubular expansion member from said datum plane as a function of loading pressure.

이 특허에 인용된 특허 (8) 인용/피인용 타임라인 분석

Serata Shosei (1229 - 8TH St. Berkeley CA 94710), Borehole stress property measuring system.
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Hearn David D. (Richardson TX) Pasternack Eric S. (Plano TX) Segalman Daniel J. (Plano TX), Downhole tool for determining in-situ formation stress orientation.
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Widrow Bernard (Santa Clara County CA), Estimation of hydraulic fracture geometry from pumping pressure measurements.
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de la Cruz Rodolfo V. (Madison WI), Method and apparatus for determining the in situ deformability of rock masses.
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Serata Shosei (1229 - 8th St. Berkeley CA 94710), Method and apparatus for measuring in situ earthen stresses and properties using a borehole probe.
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Kanduth Harald H. (Saint-Lazare CAX) Hudyma Marty (Bathurst CAX), Method and apparatus for measuring three dimensional stress in rock surrounding a borehole.
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Fontenot John E. (Houston TX), Method for determining borehole stress from MWD parameter and caliper measurements.
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Mao Nai-Hsien (Castro Valley CA), Shear wave transducer for stress measurements in boreholes.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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[미국특허] Single fracture method and apparatus for simultaneous measurement of in-situ earthen stress state and material propertie 원문보기

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[미국특허] Single fracture method and apparatus for simultaneous measurement of in-situ earthen stress state and material propertie 원문보기

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