WO1991002269A1 - Sonde d'imagerie champ total - Google Patents
Sonde d'imagerie champ total Download PDFInfo
- Publication number
- WO1991002269A1 WO1991002269A1 PCT/FR1990/000574 FR9000574W WO9102269A1 WO 1991002269 A1 WO1991002269 A1 WO 1991002269A1 FR 9000574 W FR9000574 W FR 9000574W WO 9102269 A1 WO9102269 A1 WO 9102269A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- probe
- wall
- envelope
- fluid
- elements
- Prior art date
Links
- 239000000523 sample Substances 0.000 title claims abstract description 107
- 238000003384 imaging method Methods 0.000 title claims abstract description 26
- 238000005259 measurement Methods 0.000 claims abstract description 69
- 239000000463 material Substances 0.000 claims abstract description 13
- 239000012530 fluid Substances 0.000 claims description 42
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 229920001971 elastomer Polymers 0.000 claims description 4
- 239000000806 elastomer Substances 0.000 claims description 4
- 230000003068 static effect Effects 0.000 claims description 4
- 239000002689 soil Substances 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000005553 drilling Methods 0.000 abstract description 11
- 230000015572 biosynthetic process Effects 0.000 abstract description 6
- 230000004044 response Effects 0.000 abstract description 2
- 238000009412 basement excavation Methods 0.000 abstract 2
- 239000013536 elastomeric material Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 7
- 238000005755 formation reaction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000003071 parasitic effect Effects 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000002513 implantation Methods 0.000 description 2
- 239000011859 microparticle Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/01—Devices for supporting measuring instruments on drill bits, pipes, rods or wirelines; Protecting measuring instruments in boreholes against heat, shock, pressure or the like
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V11/00—Prospecting or detecting by methods combining techniques covered by two or more of main groups G01V1/00 - G01V9/00
- G01V11/002—Details, e.g. power supply systems for logging instruments, transmitting or recording data, specially adapted for well logging, also if the prospecting method is irrelevant
- G01V11/005—Devices for positioning logging sondes with respect to the borehole wall
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/01—Devices for supporting measuring instruments on drill bits, pipes, rods or wirelines; Protecting measuring instruments in boreholes against heat, shock, pressure or the like
- E21B47/017—Protecting measuring instruments
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S367/00—Communications, electrical: acoustic wave systems and devices
- Y10S367/911—Particular well-logging apparatus
Definitions
- the present invention relates to a total field imaging probe making it possible to carry out logs over the entire periphery of the wall of a hole drilled in the basement.
- the technical sector of the invention is the manufacture and operation on site of tools or probes to carry out measurements of the characteristics of the soil in a drilled hole crossing geological formations and to record and analyze these measurements remotely.
- One of the main applications of the invention is its use for carrying out well imaging logs making it possible to obtain good coverage of the entire borehole wall, using various usual individual measurement means, such as acoustic measurements. or microresistive.
- imaging logging is a new concept making it possible, from usual individual measurements, to present the response of this wall to a physical measurement according to a developed part of the wall of the well as a function of depth. , this measurement having a vertical and horizontal definition of the order of several tens of centimeters for current logs.
- This representation on any visual support which can be displayed and which is also oriented in space, therefore constitutes an artificial image of the formations encountered. Its implementation essentially requires:
- the probes usually use rigid or semi-rigid pads constituting one side of a parallelogram, the opposite side being defined at its ends by one or two articulations located on the probe body, as described for acoustic imaging in patent application US 948,206 filed on December 31, 1986 by the company SHELL INTERNATIONAL RESEARCH.
- the measurement coverage depends on the size of the pads, their number and the diameter of the borehole. Furthermore, the descent of the tool into the well, before the measurement, requires that in the rest position, with the pads folded, these are contained within the diameter of the probe body and in the acoustic use above. , the friction of the pads on the wall generates a lot of noise.
- the cover of a probe with an outside diameter of 4 "l / 2, for example in an 8" l / 2 hole not exceed 40%; it is only 28% in a 12 "l / 4 (311 mm) well.
- the problem posed is to be able to produce a probe allowing full field imaging of the basement surrounding a hole, which improves the performance of current tools, on the one hand in the effectively total coverage of the periphery of the wall up to diameters of at least 216 mm and even beyond, with a definition of vertical and horizontal measurement of the order of a centimeter , on the entire surface of the wall, on the other hand, in the maximum elimination of the parasitic effects of the fluid medium existing in the hole and finally by allowing it to rise during measurement by limiting the possible vibrations due to friction and despite the presence of the ambient fluid medium, which must therefore circulate on either side of the probe.
- a solution to the problem posed is a total field imaging probe enabling imaging to be carried out over the entire periphery of the wall of a hole drilled in the basement and filled with a fluid, using sensors. for measuring the characteristics of this soil, mounted on or in the body of said probe, certain parts of this body being able to come into contact with said wall and in the rest position, its external shape being that of a cylinder with a diameter less than the diameter of said hole: according to the invention said body of the probe comprises at least one casing molded from a material of the elastomer type, comprising elements in helices, separated by bellows, so that by any internal means of expansion, said envelope is deployed so that said elements match the wall of the well and that said bellows provide the connections between these elements and maintain the entire envelope in a semi-rigid manner and following a continuity of its peripheral face.
- said envelope can be completely closed and contains a fluid that can be pressurized, to constitute said internal means for expanding the envelope against the wall of the well, said helical elements being provided with own elastic systems. reminder to return to the rest position in the absence of a relative pressure of the fluid greater than that of the ambient fluid and said bellows allow sufficient passage for said fluid when the probe is raised during measurement; or said internal expansion means consists of any hydromechanical system connecting each helical element to a static structural element of the probe body.
- At least one of the sensors is an ultrasonic transducer, located inside said probe, said envelope being completely closed and filled with a fluid allowing good acoustic coupling.
- at least some of said sensors are known electrodes of microresistive measurements integrated and molded in said helical elements which can come into contact with said wall of the well, and arranged along these elements so that, whatever the diameter of the expansion and measurement position compatible with said probe, the entire periphery of the wall of said well is fully covered and investigated by said electrodes, when ascending without rotation said probe.
- the probe makes it possible to overcome the constraint due to the quality of the mud and to greatly reduce the incidence of the others (contrasts of the acoustic impedances, etc.); the combination with the electrical imagery of an acoustic system also allowing the exact measurement of the geometry of the hole;
- Figure 1 is a side view of an example of a probe according to the invention in the rest position penetrating a hole.
- Figure 2 is a side view of the probe of Figure 1 in the measurement position. '
- FIG. 3 is a sectional view AA of Figure 2 of a probe in the measurement position.
- FIG. 4 is a perspective view of another example of a probe.
- the present invention relates to the probe itself, its principle of deployment and production and in no way the electronics associated with the various measurements which has already been developed for this type of application and which is therefore not described.
- the probe 5 In its rest or folded position, as shown in FIG. 1, the probe 5 can be moved into the drilled hole 1, its external shape being that of a diameter smaller than that of said hole 1.
- Said probe body 5 comprises, according to the invention, a casing 6-, molded from a material of elastomer type resistant well to abrasion, to oils, to heat, etc.
- This casing comprises elements 7 in helices, which when in the rest position, are practically adjacent to each other: these elements 7 may comprise, for measurement applications requiring contact with the wall 2, sensors 4 such as electrodes or transducers, which are then distributed helically on said envelope 6.
- the material of the electrodes may be made of elastomer or similar conductive material.
- FIG. 2 represents the same probe 5 in the measurement position, thanks to an expansion and a deployment of its envelope 6 against said wall 2 of the well or hole 1.
- bellows 8 which can be arranged in accordance with FIG. 3. Furthermore, when the envelope 6 is sealed and closed, the section available between these bellows 8 and the wall of the well 2 allows the passage of fluid such as drilling mud 10, during the ascent of the probe 5 during measurement.
- the upper and lower parts of the measurement zones of the casing 6 can be protected to avoid snagging when the probe is lowered or, during measurement, when going up. This protection can be obtained, for example by a system of "petals” overlapping more or less depending on the diameter.
- the deployment is done by pressurizing a fluid 10 inside the sealed envelope 6, which must then be closed, completely closed and sealed, controlled by a mechanical system 9 and return to return to the rest position in the absence of relative pressure of the fluid 10, ensuring the helical elements 7 a known geometry in function the outside diameter of the cylinder on which these elements are positioned and which corresponds, in the measurement position, to that of said hole 1, as shown in FIG. 3.
- said internal expansion means 9 consists of any hydromechanical system connecting each element 7 in a helix to a static structural element of the probe body 5: this hydromechanical system can consist of jacks and springs.
- the casing 6 has a double wall, the space thus delimited, can be pressurized to ensure greater rigidity.
- envelope 6 and its internal expansion means 9 can be produced according to one of the forms described above or can combine several of these forms, such as:
- FIG. 1 and 2 illustrate shapes in accordance with the first two examples mentioned above.
- the casing 6 protects the entire interior volume thus defined from the drilling mud. This implies that the upper and lower openings of this envelope seal on the corresponding parts of the body of the probe 5.
- the two basic characteristics which are to have a support on the one hand, ensuring a helical segment distribution which can wear sensors and on the other hand, having a radial deployment capacity, thanks to the presence of bellows between the measurement zones, can also be ensured without requiring the use of a sealed waterproof envelope on the probe body: this latter possibility is shown in Figure 4, in illustration of the shapes according to the last two examples mentioned above. This figure shows: the segments 7 with measurement zones located helically and the bellows 8.
- articulated arms 13 ensure deployment from the support or probe body 5; the electrodes and all of the necessary electrical connections can be molded in the casing 6 at the measurement zones.
- the casing 6 may be of a double thickness and hollow, the interior being filled with a hydraulic fluid in equipressure in the rest position, and in slight overpressure during the measurements with the ambient fluid, the geometry of whole system remaining identical.
- One of the objectives of this last variant is to introduce variable rigidity at the level of the measurement zones and to be able to modify the radius of curvature thereof by increasing the pressure inside, so as to adapt to the variations in drilling diameter.
- the bellows 8 are not hollow but a few tubular passages of small diameter located in the thickness of the bellows provide hydraulic continuity between the different measurement zones.
- the probe comprises mechanical means 9 necessary for regular withdrawal, as described above; any other solution is possible such as for example a spring system mounted on the internal edge of the bellows 8.
- This return assembly between the bellows and the static internal part of the probe 5 allows a position of equilibrium of the bellows between this return voltage and the pressure differential existing between the inside of the probe and the well, in the closed jacket and internal fluid under pressure version.
- the helical elements 7, which can therefore be of measurement, can be produced in one or more segments depending on the deployment to be obtained, the only constraint being to know at all times the geometry of these measurement elements as a function of the deployed diameter.
- the diameter can be determined in several ways, depending on the degree of precision desired:
- At least one or more acoustic reflectors are placed regularly when there are several inside the elements 7 of the probe and allow, thanks to said acoustic sensor 4 ⁇ , then rotating and rotary, when there are several, and of which l wave 12 is reflected by each of these reflectors 11, to know perfectly the geometry of the hole 1. Indeed, the speed of sound in the fluid inside the probe being perfectly known, as well as the thickness of. material between the wall of the well and the internal surface of the reflector, the radius can be permanently determined.
- said acoustic reflectors 11 are located at the intersection of each half-bellows 8 and oriented in such a way that, whatever the deployment, the perpendiculars to the planes of these reflectors pass through the acoustic sensor j , of which l wave 12 reflected by each of the reflectors always makes it possible to know the geometry of the hole 1.
- the geometry of the probe being known as a function of the diameter
- the position of the sensors 4 such as electrodes or transducers with respect to fixed references of the probe
- the position of the probe in space is known thanks to a navigation module consisting for example of a three-axis accelerometer and a three-axis magnetometer, or a three-axis gyrometer, the principles and are well known.
- the path of the acoustic wave is as follows:
- the amplitude of the reflected wave and detected by the sensor can be altered by different parameters, ': contrasts between the various acoustic impedances of the materials or fluid crossed: probe fluid / envelope, envelope / drilling fluid, etc. ; density of the mud and particularly presence of solid microparticles which play a major role in weakening the acoustic signal;
- said probe then consists of at least two envelopes 6 placed one above the other and which may include elements 7 and sensors 4 with different characteristics from one to the other in order to be able to produce different types of measurement.
- the general geometry of the probe remains unchanged; the upper part being reserved for one type of measurement, the lower part for another and so on if there are several.
- this probe can include a camera: in this case the material of the elements 7 is transparent, said envelope 6 being completely closed and filled with a fluid allowing good optical coupling, one of said sensors 4 placed in the envelope such as for example the sensor 4, acoustics shown in FIG. 3 being a well camera capable of allowing observation, even in the presence of opaque mud.
- M CCD camera "wells, which technique is well known, can be radially oriented along 360 ° of freedom, its axis of rotation being axially movable to be able to investigate the full height of the window defined by the transparent elements.
- This type of measurement is generally carried out stationary and the probe is folded between each station. Wall cleaning using suitable scrapers with the drill string can be carried out before the measurements.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Geology (AREA)
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Geophysics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE90912494T DE69006737D1 (de) | 1989-08-01 | 1990-07-27 | Totalfeldabbildungssonde. |
AT90912494T ATE101726T1 (de) | 1989-08-01 | 1990-07-27 | Totalfeldabbildungssonde. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8910582A FR2650677B1 (fr) | 1989-08-01 | 1989-08-01 | Sonde d'imagerie champ total |
FR89/10582 | 1989-08-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1991002269A1 true WO1991002269A1 (fr) | 1991-02-21 |
Family
ID=9384514
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1990/000574 WO1991002269A1 (fr) | 1989-08-01 | 1990-07-27 | Sonde d'imagerie champ total |
Country Status (7)
Country | Link |
---|---|
US (1) | US5255245A (fr) |
EP (1) | EP0485488B1 (fr) |
AU (1) | AU6182790A (fr) |
CA (1) | CA2059650A1 (fr) |
DE (1) | DE69006737D1 (fr) |
FR (1) | FR2650677B1 (fr) |
WO (1) | WO1991002269A1 (fr) |
Families Citing this family (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5502686A (en) * | 1994-08-01 | 1996-03-26 | Western Atlas International | Method and apparatus for imaging a borehole sidewall |
US5541889A (en) * | 1995-01-31 | 1996-07-30 | Western Atlas International | Borehole fluid replacement means and method |
US7187784B2 (en) * | 1998-09-30 | 2007-03-06 | Florida State University Research Foundation, Inc. | Borescope for drilled shaft inspection |
AU2003231043A1 (en) * | 2002-04-25 | 2003-11-10 | Quantx Wellbore Instrumentation, Llc | System and method for acquiring seismic and micro-seismic data in deviated wellbores |
FR2845416B1 (fr) * | 2002-10-02 | 2004-12-24 | Inst Rech Developpement Ird | Sonde de diagraphie electrique pour la mesure de la resistivite sur la paroi d'un forage |
US6868035B2 (en) * | 2002-11-05 | 2005-03-15 | Bechtel Bwxt Idaho, Lcc | Method and apparatus for coupling seismic sensors to a borehole wall |
US6986389B2 (en) * | 2003-05-02 | 2006-01-17 | Weatherford/Lamb, Inc. | Adjustable deployment apparatus for an actively clamped tubing-conveyed in-well seismic station |
GB2420624B (en) * | 2004-11-30 | 2008-04-02 | Vetco Gray Controls Ltd | Sonde attachment means |
US8270250B2 (en) | 2006-01-03 | 2012-09-18 | Halliburton Energy Services, Inc. | Programmable data acquisition for tubular objects |
US20090107725A1 (en) * | 2007-10-30 | 2009-04-30 | Christy Thomas M | System and method for logging soil properties in a borehole |
WO2016076868A1 (fr) | 2014-11-13 | 2016-05-19 | Halliburton Energy Services, Inc. | Télémétrie de puits avec un plongeur robotique autonome |
WO2016076876A1 (fr) * | 2014-11-13 | 2016-05-19 | Halliburton Energy Services, Inc. | Diagraphie de puits avec un plongeur robotique autonome |
JP2017125744A (ja) * | 2016-01-13 | 2017-07-20 | 株式会社大林組 | 超音波溝壁測定装置 |
CA3017466C (fr) | 2016-04-19 | 2020-08-11 | Halliburton Energy Services, Inc. | Ensemble capteur d'imagerie de trou de forage |
US10557340B2 (en) * | 2017-10-23 | 2020-02-11 | Aver Technologies, Inc. | Ultrasonic borescope for drilled shaft inspection |
US10677039B1 (en) | 2020-01-31 | 2020-06-09 | Aver Technologies, Inc. | Borescope for drilled shaft inspection |
US11136879B2 (en) | 2020-01-31 | 2021-10-05 | Aver Technologies, Inc. | Borescope for drilled shaft inspection |
CA3175094A1 (fr) | 2020-03-13 | 2021-09-16 | Geonomic Technologies Inc. | Procede et appareil de mesure d'un puits de forage |
CN113622833B (zh) * | 2021-08-11 | 2024-03-26 | 中国石油大学(华东) | 一种基于波纹管的井下油压补偿动密封装置及方法 |
WO2024152110A1 (fr) * | 2023-01-19 | 2024-07-25 | Geonomic Technologies Inc. | Procédé de mesure d'un profil d'un puits de forage et appareil de mesure de puits de forage associé |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2930969A (en) * | 1956-05-16 | 1960-03-29 | Dresser Ind | Electrical earth borehole logging apparatus |
FR2448621A1 (fr) * | 1979-02-09 | 1980-09-05 | Inst Francais Du Petrole | Sonde a patin rotatif pour effectuer des mesures dans un forage |
US4236113A (en) * | 1978-04-13 | 1980-11-25 | Phillips Petroleum Company | Electrical well logging tool, having an expandable sleeve, for determining if clay is present in an earth formation |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4899320A (en) * | 1985-07-05 | 1990-02-06 | Atlantic Richfield Company | Downhole tool for determining in-situ formation stress orientation |
FR2611919B1 (fr) * | 1987-03-05 | 1989-06-16 | Schlumberger Prospection | Sonde de diagraphie equipee de patins de mesure a large champ d'observation angulaire |
-
1989
- 1989-08-01 FR FR8910582A patent/FR2650677B1/fr not_active Expired - Lifetime
-
1990
- 1990-07-27 US US07/828,912 patent/US5255245A/en not_active Expired - Fee Related
- 1990-07-27 CA CA002059650A patent/CA2059650A1/fr not_active Abandoned
- 1990-07-27 WO PCT/FR1990/000574 patent/WO1991002269A1/fr active IP Right Grant
- 1990-07-27 EP EP90912494A patent/EP0485488B1/fr not_active Expired - Lifetime
- 1990-07-27 AU AU61827/90A patent/AU6182790A/en not_active Abandoned
- 1990-07-27 DE DE90912494T patent/DE69006737D1/de not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2930969A (en) * | 1956-05-16 | 1960-03-29 | Dresser Ind | Electrical earth borehole logging apparatus |
US4236113A (en) * | 1978-04-13 | 1980-11-25 | Phillips Petroleum Company | Electrical well logging tool, having an expandable sleeve, for determining if clay is present in an earth formation |
FR2448621A1 (fr) * | 1979-02-09 | 1980-09-05 | Inst Francais Du Petrole | Sonde a patin rotatif pour effectuer des mesures dans un forage |
Also Published As
Publication number | Publication date |
---|---|
US5255245A (en) | 1993-10-19 |
FR2650677A1 (fr) | 1991-02-08 |
EP0485488B1 (fr) | 1994-02-16 |
AU6182790A (en) | 1991-03-11 |
EP0485488A1 (fr) | 1992-05-20 |
DE69006737D1 (de) | 1994-03-24 |
FR2650677B1 (fr) | 1991-11-22 |
CA2059650A1 (fr) | 1991-02-02 |
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