GB2091781A - Apparatus for releasably anchoring a body in a desired location - Google Patents
Apparatus for releasably anchoring a body in a desired location Download PDFInfo
- Publication number
- GB2091781A GB2091781A GB8102055A GB8102055A GB2091781A GB 2091781 A GB2091781 A GB 2091781A GB 8102055 A GB8102055 A GB 8102055A GB 8102055 A GB8102055 A GB 8102055A GB 2091781 A GB2091781 A GB 2091781A
- Authority
- GB
- United Kingdom
- Prior art keywords
- wedge
- wedge component
- housing
- desired location
- component
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004873 anchoring Methods 0.000 title claims description 11
- 230000003213 activating effect Effects 0.000 claims abstract description 23
- 239000011435 rock Substances 0.000 abstract description 8
- 230000000717 retained effect Effects 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 230000001681 protective 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
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/01—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for anchoring the tools 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention provides apparatus for releasably locating a transducer housing (1) in a borehole (2) formed in rock strata, the housing providing a support member of the apparatus. A wedge arrangement is provided comprising a first wedge component (10) resiliently urged towards the housing by a resilient bias (11) and a second wedge component co-operable with the first wedge component, the second wedge component being connected to an activating arm (34) movable in one direction to cause the wedge arrangement to urge the first wedge component against its resilient bias to anchor the housing in the borehole and movable in another direction to release the housing. <IMAGE>
Description
SPECIFICATION
Apparatus for releasably anchoring a body in a desired location
This invention relates to apparatus for releasably anchoring a body in a desired location.
In particular, although not exclusively, the present invention relates to apparatus for relasably anchoring a transducer in a desired location within a borehole formed in rock strata. The invention finds particular, although not exclusive application in seismic exploration of minerals.
In such exploration, it frequently is necessary to anchor transducers in boreholes in a rock strata, as for example, mineral seams, wherein they are arranged to detect seismic disturbances. A known example of such apparatus comprises a rod attached to a transducer and sleeved with a slidable sleeve, the rod being used so that the transducer can be remotely positioned. A leaf spring is attached to the transducer and the sleeve and in use the leaf spring urges the transducer against walls in the borehole in which the transducer is positioned.
Unfortunately, the prior known apparatus suffers from two serious deficiences being that it does not couple well within the borehole and seismic signals received by the transducer tend to be distorted. Also the spring tends not to provide a positive anchorage in the borehole. The known apparatus tends not to be suitable for location in standard size boreholes.
An object of the present invention is to provide an improved apparatus which mitigates the above deficier.ces.
According to the present invention apparatus for releasably anchoring a body in a desired location comprises a support member which, in use, is fixedly associated with the body, a wedge arrangement including a first wedge component which is urged towards the support member under the action of a resilient bias and a second wedge component cooperable between the support member and the first wedge component, and an activating arm connected to the second wedge component and movable in one direction to urge the second wedge component to co-operate with the first wedge component which thereby, in use, is urged against the resilient bias tending to effectively increase an outside dimension of the apparatus to anchor the body in the desired location and movable in another direction to urge the second wedge component to co-operate with the first wedge component to release the body.
Preferably, when the second wedge component co-operates with the first wedge component to release the body, the first wedge component is free to move underthe action ofthe resilient bias.
Preferably, the activating arm is integral with the second wedge component.
Preferably, the second wedge component comprises two substantially parallel wedge elements arranged one on either side of the activating arm.
Conveniently, the first wedge component comprises two substantially parallel wedge elements interconnected by a bridging portion.
Preferably, the first wedge component is carried on a resilient arm providing the resilient bias.
Preferably, the support member is secured to the body which constitutes a housing for at least one transducer.
Preferably, the activating arm is cranked around one end of the body.
Preferably, the apparatus comprises an elongate locating tool releasably securable to the body.
Preferably, the activating arm is provided with an elongate trailing element enabling the activating arm to be moved in said one direction tending to anchorthe body in the desired location.
Preferably, the activating arm engages a slideway provided on the support member.
Preferably, the assembly comprising the first wedge component and the resilient arm includes means for enabling pads to be secured to the assembly to increase said outside dimensions of the apparatus.
By way of example, one embodiment of the present invention now will be described with reference to the accompanying drawings, in which Figure 1 is a side veiw of a body provided with apparatus for releasably anchoring the body in a desired location;
Figure 2 is a plan of Figure 1;
Figure 3 is an end view of Figure 1 looking in the direction of arrow A;
Figure 4 is an incomplete side view, partly in section of a portion of the body and apparatus of Figure 1, the body and apparatus being shown in an operational position in a desired location;
Figure 5 is an incomplete end view of Figure 4 looking in the direction of arrow B;
Figure 6 is an incomplete end view similar to Figure 5 but showing the apparatus modified to suit another desired location;;
Figure 7 is an incomplete end view similar to Figure 6 but showing the apparatus further modified to suit a further desired location;
Figure 8 is a side view of a detail of Figure 1;
Figure 9 is an inverted plan of FigureS; Figure 10 is an end view of Figure 8 looking in the direction of arrow C;
Figure 11 is a side view of a further detail of Figure 1;
Figure 12 is a plan of Figure 11;
Figure 13 is an incomplete section taken longitudinally through the body of Figure 1; and
Figure 14 is an incomplete plan partly in section of
Figure 13.
Figures 1 to 5 ofthe drawings illustrate a housing 1 including a support member and a body to hold three seismic geophone transducers for detecting vibrations in rock strata. The transducers are arranged to detect vibrations in three mutually transverse axes. In Figures 4 and 5 the housing is shown at a desired location within a borehole 2 (only the adjacent portion of which is shown) and in Figure 1 a protective end cap 3 for one of the transducers is shown.
The housing is provided with apparatus For fleas ably anchoring the housing at the desired location within the borehole, the apparatus comprising a self locking wedge arrangement including a first wedge component 10 which is carried on one end of E; resilient arm 11 constituting one limb of a generally 'L' shape resilient member the other limb 12 of which is secured by screws 13 to one end of the housing, the action of the resilient member being to urge the first wedge component towards the housing.The first wedge component 10 which is shown in more detail in Figures 8,9, and 10 comprise two substantially parallel wedge elements 15 and 16 interconnected by a generally inverted trough shape bridging portion which is integral with the elements 15 and 16.
The first wedge component has two pairs of holes 18 for engagement by screws 19 securing the wedge component 10 to lips 20 extending downwards on the resilient arm 11. Each wedge element 15 and 16 has a downwardly facing wedge surface 21.
An additional resilient member 22 provides additional support to the resilient members 11, 12.
The wedge arrangement also comprises a second wedge component 30 co-operable between the upward facing surface 31 of the housing 1 and the first wedge component 10, the second wedge component 30 (see particularly Figures 11 and 12)com- prising two substantially parallel wedge elements 32 and 33 formed integral with a centrally extending cranked elongate activating arm 34. The wedge ele
ments 32 and 33 have upwardly directed wedge surfaces 35 for co-operation with the aforementioned
downwardiy directed wedge surfaces 21 of the
wedge elements 15 and 16.
The activating arm 34 has a generally horizontally
extending arm arranged to slide over the surface 31
provided by the support member or housing 1 and is
guided throughout its sliding movement by a slide
way 36 defined by a bridging member 37 fixedly secured to the housing. The other limb 38 of the crank arm extends vertically downwards over the adjacent end ofthe housing and is provided with an eyelet 39 for a trailing wire 40 (see Figure 1).
The activating arm is movable in one direction (ie the right hand side as seen in Figures 1 and 4) from the position as seen in Figure 1 with the vertical limb 38 adjacent to the end of the housing 1 to a position as seen in Figure 4 with the vertical limb 38 relatively remote from the end of the housing, such movement of the activating arm in said one direction urging the second wedge component 30 to co-operate with the first wedge component 10 which thereby is urged against the action of the resilient bias 11, 12 tending to effectively increase the vertical outside dimension of the apparatus to anchor the housing 1 in the desired location within the borehole 2 (as indicated in Figures 4 and 5). The co-operation of the wedge components urges the first wedge component 10 upwards relative to the housing into contact with the uppermost wall of the borehole.The same reaction urging the housing into contact with the floor of the borehole. The self-locking feature of the wedge arrangement ensures that once the two wedge components are engaged they are retained in the wedged mode and, therefore, the housing is securely anchored at the desired location and the trans duders are able to sense and detect ground vibrations in the adjacent rock strata.The activating arm 34 is urged to move in said one direction by an operator pulling on the wire 40 while the remainder ofthe housing and apparatus is retained at the desired location along the borehole by an elongate locating tool (now shown) having a forked end piece for spanning the vertical limb 38 of the activating arm to allow movement ofthe arm in said one direction and engaging in location recesses 44 (only one of which is shown) provided in the end ofthe housing. Location ofthe locating tool in the recesses enables the housing to be retained in the desired location along the borehole and also at the desired orientation within the adjacent rock strata. After the housing is anchored at the desired location the locating tool is withdrawn from the borehole.
After the seismic exploration is completed and it is desired to remove the transducers from the borehole, the locating tool is re-inserted into the borehole to abut the vertical limb 38 of the activating arm 34. The housing 1 is retained stationary in the borehole by the operator pulling on a reinforced trailing cable 45 (see Figure 1) feeding the signal lines from the transducers along the borehole to sensing the processing equipment. Simultaneously, the operator pushes on the locating tool to urge the activation arms to move in the opposite direction to said one direction such that the vertical limb 38 moves from the relatively remote position as seen in
Figure 4 to the position in which it is adjacent to the end of the housing 1 as seen in Figure 1.This movement of the activating arm in said opposite direction urges the second wedge component 30 to cooperate with the first wedge component to release the housing from its anchored position. The operator than after first withdrawing the locating tool hauls on the trailing cable 45 to haul the released housing of the borehole. Upon the wedge components releasing the hosing the first wedge component is free to move under its resilient bias. If the released housing becomes lodged in the borehole the locating tool can be relocated into the recesses 44 in the body so that the housing can be rotated whilst being withdrawn from the borehole.
Details of the connection of the reinforced trailing cable 45 to the housing 1 are disclosed in Figures 13 and 14. As seen in Figure 13 the cable first is threaded around a removable pin assembly comprising two removable pins 46 which are assembled during the threading of the cable. Next the cable is engaged by a screw clamp 47 comprising a jaw 48 and two screws 49 arranged to securely clamp the cable. After passing through the clamp 47 the cable sheath is removed and the signal lines 50 are shown extending to the aforementioned three geophone tranducers 51, 52 and 53 mounted to detect the Z, Y and X components of ground vibrations.
From the above description it will be appreciated that the present invention provides apparatus for releasably anchoring a transducer housing in a borehole formed in rock strata, the housing being anchored at a desired location and at a desired orientation within the rock strata. The apparatus is simple, reliable robust and easy to operate.
Figures 6 and 7 are similar end views to Figure 5 but showing slightly modified apparatus suitable for releasably anchoring the housing in increased diameter boreholes. In Figure 6 an inverted trough shaped spacing member 60 is secured to the uppermost portion of the first wedge component 10 and in
Figure 7 an additional pad 61 is secured to the uppermost portion of the spacing member. Details of the second wedge component are omitted in Figures 6 and 7.
Claims (13)
1. Apparatus for releasably anchoring a body in a desired location comprising a support member, which, in use, is fixedly associated with the body, a wedge arrangement including a first wedge component which is urged towards the support member underthe action of a resilient bias and a second wedge component co-operable between the support member and the first wedge component, and an activating arm connected to the second wedge component and movable in one direction to urge the second wedge component to co-operate with the first wedge component which thereby in use, is urged against the resilient bias tending to effectively increase an outside dimension of the apparatus to anchorthe body in the desired location and movable in the other direction to urge the second wedge component to co-operate with the first wedge componentto release the body.
2. Apparatus as claimed in claim 1, in which when the second wedge component co-operates with the first wedge component to release the body, the first wedge component is free to move under the action of the resilient bias.
3. Apparatus as claimed in claim 1 or 2, in which the activating arm is integral with the second wedge component.
4. Apparatus as claimed in claim 3, in which the second wedge component comprises two substantially parallel wedge elements arranged one on either side of the activating arm.
5. Apparatus as claimed in claim 4, in which the first wedge component comprises two substantially parallel wedge elements interconnected by a bridging portion.
6. Apparatus as claimed in claim 5, in which the first wedge component is carried on an resilient arm providing the resilient bias.
7. Apparatus as claimed in any one of the preceding claims, in which the support member is secured to the body which constitutes a housing for at least one transducer.
8. Apparatus as claimed in any one of the preceding claims, in which the activating arm is cranked around one end of the body.
9. Apparatus as claimed in any one of the preceding claims, comprising an elongate locating tool releasably securable to the body.
10. Apparatus as claimed in any one of the preceding claims, in which the activating arm is provided with an elongate trailing element enabling the activating arm to be moved in said one direction tending to anchorthe body in the desired location.
11. Apparatus as claimed in any one ofthe preceding claims, in which the activating arm engages a slideway provided on the support member.
12. Apparatus as claimed in any one of the preceding claims, in which the assembly comprising the first wedge component and the resilient arm includes means for enabling pads to be secured to the assembly to increase said outside dimensions of the apparatus.
13. Apparatus for releasably anchoring a body in a desired location, substantially as described herein and substantially as shown in the accompanying drawings.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8102055A GB2091781B (en) | 1981-01-23 | 1981-01-23 | Apparatus for releasably anchoring a body in a desired location |
| AU79733/82A AU7973382A (en) | 1981-01-23 | 1982-01-22 | Apparatus for releasably anchoring sonde in borehole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8102055A GB2091781B (en) | 1981-01-23 | 1981-01-23 | Apparatus for releasably anchoring a body in a desired location |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2091781A true GB2091781A (en) | 1982-08-04 |
| GB2091781B GB2091781B (en) | 1984-07-04 |
Family
ID=10519163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8102055A Expired GB2091781B (en) | 1981-01-23 | 1981-01-23 | Apparatus for releasably anchoring a body in a desired location |
Country Status (2)
| Country | Link |
|---|---|
| AU (1) | AU7973382A (en) |
| GB (1) | GB2091781B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114729565A (en) * | 2019-10-25 | 2022-07-08 | 贝克休斯油田作业有限责任公司 | Adaptive anchor, system and method |
-
1981
- 1981-01-23 GB GB8102055A patent/GB2091781B/en not_active Expired
-
1982
- 1982-01-22 AU AU79733/82A patent/AU7973382A/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114729565A (en) * | 2019-10-25 | 2022-07-08 | 贝克休斯油田作业有限责任公司 | Adaptive anchor, system and method |
| CN114729565B (en) * | 2019-10-25 | 2024-01-23 | 贝克休斯油田作业有限责任公司 | Adaptive anchor, drilling system and method for anchoring a tool in a borehole |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2091781B (en) | 1984-07-04 |
| AU7973382A (en) | 1982-07-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |