EP1058768A1 - Safety seal for wells - Google Patents
Safety seal for wellsInfo
- Publication number
- EP1058768A1 EP1058768A1 EP99907993A EP99907993A EP1058768A1 EP 1058768 A1 EP1058768 A1 EP 1058768A1 EP 99907993 A EP99907993 A EP 99907993A EP 99907993 A EP99907993 A EP 99907993A EP 1058768 A1 EP1058768 A1 EP 1058768A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lid
- well
- safety seal
- liquid
- string
- 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.)
- Withdrawn
Links
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 16
- 230000006978 adaptation Effects 0.000 claims 1
- 238000007789 sealing Methods 0.000 description 8
- 238000007689 inspection Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- GQWNECFJGBQMBO-UHFFFAOYSA-N Molindone hydrochloride Chemical compound Cl.O=C1C=2C(CC)=C(C)NC=2CCC1CN1CCOCC1 GQWNECFJGBQMBO-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000013022 venting Methods 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/10—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
-
- 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
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/01—Sealings characterised by their shape
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/30—Geothermal collectors using underground reservoirs for accumulating working fluids or intermediate fluids
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Definitions
- the present invention relates to safety seals for wells, primarily energy wells.
- the main object of the invention is to suggest a lid construction, which is easy to open, for example for the purpose of inspection and servicing of the piping system, but which efficiently prevents liquid or liquid-borne impurities from unintentionally penetrating into the well hole and pollute water present therein and usually in communication with the subsoil water in the ground.
- a safety seal in accordance with the invention, which seal is essentially characterised in that it comprises, in combination, a lid one face of which is turned towards the well hole, and a string, which is inserted in the gap between said well wall and said lid face and which consists of a material that swells upon its contact with a liquid.
- the well lid is easy to dismantle as long as no liquid tries to penetrate into the well hole but, should this happen, for instance in consequence of flooding, the lid is arranged to form an efficient seal.
- the seal string When such undesirable liquid tends to penetrate into the well hole, past the seal string of a material that swells upon its contact with liquid, said seal string will swell as a result of the supply of liquid and efficiently fill the gap between the lid and the well wall, thereby efficiently constraining the liquid tending to flow down the well hole, also at high pressures.
- Fig 1 is a vertical sectional view through an energy well having an inspection space in the upper region closest to ground level
- Fig 2 is a cross-sectional view through the upper part of a well casing and its associated closure lid, projecting into the inspection space interior,
- Fig 3 is a view from below of the lid shown in Fig 2 .
- Fig 4 is a part cross-sectional view through the lid and the part of a well casing projecting into the lid showing a different seal from that shown in Fig 2.
- Fig 1 shows a well hole formed by a well casing 2 implanted in the ground 1.
- the well casing projects somewhat above the bottom 3 of an inspection space 4 comprising lateral walls 5 and a lid 6 closing the top of the inspection space.
- the components 3, 5 and 6 of the inspection space shown in Fig 1 may be made from concrete, but also other materials, such as plastics, are possible.
- Numeral reference 7 designates a lid 7, which in the shown embodiment is designed as a disk-like part 8 bridging the end of the well casing 2.
- a number of annular grooves are formed in the disk- like part from below, said grooves being mutually concentric in accordance with the shown embodiment.
- the well casing 2 projects into one of these grooves.
- Pipe joining pieces 13, 14 extend through apertures 11 and 12 formed in the lid, the lower ends of said pieces being connected to pipes 15, 16 leading down into the well and the upper ends of which are connected to pipes 17, which extend for instance into a building, and possibly also to a venting pipe 18. It should be appreciated that the various pipes could be 3 joined together directly and extend through the lid 7, obviating the need for the pipe joining pieces 13, 14.
- space 4 when there is no need for a large-volume space, space 4 could be replaced by a pipe 19, indicated in Fig 2 by dotted lines, which pipe is mounted in an oblique position on top of the lid 7 and is orientated by locating shoulders 27 or the like disposed on the lid top.
- the pipe 19 may be fixed to the lid by means of locking screws or the like extending into the shoulders 27.
- the pipe 19 may be fitted at its top with a lid.
- the pipe 19 may be made from a plastics material as well as from some other suitable material.
- Numeral reference 20 designates a string of a material of a kind that swells upon its contact with liquid, said string being received in the relevant one of grooves 9.
- the string 20 of material is inserted in the shape of an annulus for reception of the upper end of the well casing 2 before the lid is applied on top of the well casing.
- the material may be positioned in the manner shown in Fig 2 , and may be placed on the bottom of the groove or even be fitted over the top of the well casing in the manner of a hood 21 so as to enclose the upper part of the well casing.
- the hood 21 could be inserted in the groove already before the lid is placed on top of the well casing or be positioned on top of the well casing end before the latter is introduced into the groove formed in the lid.
- strings of a sealing material may be placed between collars 22 23; 24 25 projecting radially from the pipes 13,14.
- the collars may be attached to the pipes in any suitable manner. It should be appreciated that it is possible to place such seals in grooves 26 formed at the periphery of the apertures 11, 12 and indicated in Fig 3 by means of dashed lines. In this case, the collars 22-25 may be omitted.
- the lid is passed over the end portion of a well casing in such a manner that the well casing end portion projects into annular grooves formed in the lid.
- the invention is not limited to this configuration but could be applied together with other designs to seal a lid against the well hole wall. Consequently, the well hole need not be formed by a well casing projecting into the lid but could be any kind of hole extending down into the ground and having a comparatively smooth wall face, to be fitted with a covering lid.
- a sealing member in accordance with the invention may be inserted in the gap between the lid and the smooth face adjoining the well hole. The seal could be applied on the outer as well as on the inner face of a well casing.
- the structure and number of pipes passing through the lid could vary largely, depending on the purpose of these pipes .
- the pipes could be part of a heat-pump system using a special heat carrier medium, as well as form the water pipes used for supplying water from the associated well.
- the well could be used both for extraction of heat to a heat-pump system and for transportation of drinking water. Also a combination of these kinds of pipes is possible in one and the same well without departure from the inventive idea.
- the string seal In con- sequence of its considerable expansion the string seal will be pressed against and efficiently seal against the adjacent surfaces, thus efficiently preventing undesirable liquid and polluting substances contained therein from passing past the well lid and into the well hole, which would have caused pollution of the groundwater or at least of water present in the well hole.
- suitable dimensioning of the sealing member it also becomes possible to obtain air passage past the sealing member because the latter does not seal completely against the surrounding surfaces. This means that during normal operation of the well it becomes possible to achieve efficient pressure equalisation between the well hole and its surrounding.
- the sealing member Once the sealing member has expanded, the sealed condition is maintained until the lid is removed and a fresh seal is applied. Preferably this is done when there is no immediate risk for water effects.
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Energy (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Combustion & Propulsion (AREA)
- Chemical & Material Sciences (AREA)
- Sustainable Development (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Closures For Containers (AREA)
- Pipe Accessories (AREA)
- Sewage (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9800628A SE511806C2 (sv) | 1998-02-27 | 1998-02-27 | Säkerhetstätning för brunnar |
SE9800628 | 1998-02-27 | ||
PCT/SE1999/000207 WO1999043922A1 (en) | 1998-02-27 | 1999-02-17 | Safety seal for wells |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1058768A1 true EP1058768A1 (en) | 2000-12-13 |
Family
ID=20410351
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99907993A Withdrawn EP1058768A1 (en) | 1998-02-27 | 1999-02-17 | Safety seal for wells |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1058768A1 (no) |
AU (1) | AU2751899A (no) |
NO (1) | NO20004285L (no) |
PL (1) | PL342488A1 (no) |
SE (1) | SE511806C2 (no) |
WO (1) | WO1999043922A1 (no) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE531106C2 (sv) * | 2005-05-26 | 2008-12-16 | Pemtec Ab | Tätningsorgan |
FR2992997A1 (fr) * | 2012-07-06 | 2014-01-10 | Dakeez France | Dispositif de couverture d'une canalisation d'un puits de forage |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3568769A (en) * | 1969-07-07 | 1971-03-09 | Herbert W Maass | Well casing cap |
SE408564B (sv) * | 1977-10-26 | 1979-06-18 | Rp Rorprodukter Ab | Tetningskapa |
SE466869B (sv) * | 1990-03-08 | 1992-04-13 | Anders Nelson | Anordning foer avtaetning kring roer mot ett haal och anvaendning av anordningen |
-
1998
- 1998-02-27 SE SE9800628A patent/SE511806C2/sv not_active IP Right Cessation
-
1999
- 1999-02-17 PL PL99342488A patent/PL342488A1/xx unknown
- 1999-02-17 AU AU27518/99A patent/AU2751899A/en not_active Abandoned
- 1999-02-17 EP EP99907993A patent/EP1058768A1/en not_active Withdrawn
- 1999-02-17 WO PCT/SE1999/000207 patent/WO1999043922A1/en not_active Application Discontinuation
-
2000
- 2000-08-25 NO NO20004285A patent/NO20004285L/no unknown
Non-Patent Citations (1)
Title |
---|
See references of WO9943922A1 * |
Also Published As
Publication number | Publication date |
---|---|
PL342488A1 (en) | 2001-06-04 |
SE9800628L (sv) | 1999-08-28 |
AU2751899A (en) | 1999-09-15 |
NO20004285D0 (no) | 2000-08-25 |
SE9800628D0 (sv) | 1998-02-27 |
SE511806C2 (sv) | 1999-11-29 |
NO20004285L (no) | 2000-08-25 |
WO1999043922A1 (en) | 1999-09-02 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20000816 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FI FR GB IT LI NL SE |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20010901 |