Patent US4814609A successfully refreshed from Google Patents.
US4814609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods and apparatus for safely measuring downhole conditions and formation characteristics while drilling a borehole
Assignee: Schlumberger Technology Corp
•
Filing: 1987-03-13
•
Granted: 1989-03-21
•
Expires: 2007-03-13
Abstract
Abstract A borehole logging apparatus for performing radiation based measurements has a tubular body for movement through a borehole. The tubular body includes an upwardly opening passage and an interior chamber for accommodating the positioning and lengthwise insertion and removal of an energy radiating source. The radiation source includes an uppermost portion which may be remotely engaged by a source removing device for its removal in the event the tool becomes stuck in the borehole and in order to facilitate source handling at the earth's surface.
Inventors
- 👤 Peter D. Wraight
- 👤 Edouard Marienbach
- 👤 Jean-Michel Hache
- 👤 Erik Rhein-Knudsen
- 👤 Mike Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:14
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1078; E21B23/00; E21B23/03; E21B47/00; E21B47/01; E21B47/017; G; G01; G01V; G01V5/00; G01V5/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
134 words
A logging apparatus having a tubular body for movement through a borehole while making investigations of the properties of earth formations surrounding the borehole comprising: a. an upwardly opening passage in an upper portion of said tubular body for accommodating the lengthwise insertion and removal of an energy radiating source; b. a chamber in the interior of said tubular body and communicating with said passage for receiving an energy radiating source therein; c. an energy radiating source means comprising a source and source mount removably positioned in said chamber, said source means including means for removing said source, said removing means comprising an uppermost portion of said source means configured so as to be engagable by a source removing device; and d. a radiation detector disposed at a location spaced lengthwise from said chamber.
Claim 2
Dependent Claim
134 words
A logging apparatus having a tubular body for movement through a borehole while making investigations of the properties of earth formations surrounding the borehole comprising: a. an upwardly opening passage in an upper portion of said tubular body for accommodating the lengthwise insertion and removal of an energy radiating source; b. a chamber in the interior of said tubular body and communicating with said passage for receiving an energy radiating source therein; c. an energy radiating source means comprising a source and source mount removably positioned in said chamber, said source means including means for removing said source, said removing means comprising an uppermost portion of said source means configured so as to be engagable by a source removing device; and d. a radiation detector disposed at a location spaced lengthwise from said chamber.
Claim 3
Dependent Claim
46 words
The logging apparatus as recited in claim 1 in which said source includes a gamma ray source and wherein said apparatus includes means arranged on the exterior of said tubular body for substantially reducing radiation streaming through the borehole annulus from said source to said detector.
Claim 4
Dependent Claim
30 words
The logging apparatus as recited in claim 2 further including passages adjacent both said chamber and said detector for directing gamma radiation through said tubular body and said exterior means.
Claim 5
Dependent Claim
33 words
The logging apparatus as recited in claim 3 further including means in said passages for excluding fluids in the borehole annulus from said passages and for permitting the passage of gamma rays therethrough.
Claim 6
Dependent Claim
25 words
The logging apparatus as recited in claim 2 wherein said gamma ray source is disposed eccentered from the longitudinal central axis of said tubular body.
Claim 7
Dependent Claim
36 words
The logging apparatus as recited in claim 1 in which said source includes a neutron source and said apparatus further includes means for positioning said neutron source on the longitudinal central axis of said tubular body.
Claim 8
Dependent Claim
30 words
The logging apparatus as recited in claim 1 wherein said energy radiating source includes a neutron source and a gamma ray source and means for coupling one to the other.
Claim 9
Dependent Claim
49 words
The logging apparatus as recited in claim 7 further including means on the interior of said tubular body for positioning said neutron source on the longitudinal central axis of said tubular body and for positioning said gamma ray source eccentered from the longitudinal central axis of said tubular body.
Claim 10
Dependent Claim
16 words
The logging apparatus as recited in claim 1 wherein said tubular body comprises a drill collar.
Claim 11
Dependent Claim
16 words
The logging apparatus as recited in claim 7 wherein said source coupling means is laterally flexible.
Claim 12
Dependent Claim
27 words
The logging apparatus as recited in claim 1 wherein said chamber is an upwardly opening chamber at least partially located in the wall of said tubular body.
References Cited (Backward Citations)
US2443731A
Cited
US2986639A
Cited
US3078370A
Cited
US3071689A
Cited
US3321625A
Cited
US3255353A
Cited
US3521065A
Cited
US4048495A
Cited
US4006777A
Cited
US4180730A
Cited
US4520468A
Cited
US4468762A
Cited
US4412130A
Cited
US4492865A
Cited
US4550392A
Cited
US4596926A
Cited
US4705944A
Cited
GB2175085A
Cited
US4698501A
Cited
GB2183831A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-20 | 1992-09-19 | 1993-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-20 | 1996-09-19 | 1997-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-20 | 2000-09-19 | 2001-03-21 | $7700.00 | Window Closed / Lapsed |