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
  • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
  • E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
  • E21B43/305—Specific pattern of wells, e.g. optimising the spacing of wells comprising at least one inclined or horizontal well
• • 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
  • E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
  • E21B41/08—Underwater guide bases, e.g. drilling templates; Levelling thereof
• • 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
  • E21B7/00—Special methods or apparatus for drilling
  • E21B7/04—Directional drilling
  • E21B7/043—Directional drilling for underwater installations
• • 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
  • E21B7/00—Special methods or apparatus for drilling
  • E21B7/12—Underwater drilling
• • 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
  • Y02E10/30—Energy from the sea, e.g. using wave energy or salinity gradient

Definitions

• the present invention relates to a method for estab ⁇ lishing a connection from the sea bed to a tunnel which is provided in advance by blasting or drilling. Such tunnel connections are necessary in so called ocean
• thermical energy plants producing energy by utilizing the temperature difference between the surface water and water on great depth.
• the diameter of the pipeline is insignificant in relation to the diameter of the tunnel.
• the object of this invention is to provide a safe method of establishing a connection of the kind stated introductory, said connection having a flow cross, section, in hydraulic respect substantially correspon ⁇ ding to the cross section of the tunnel.
• the purpose of this invention is obtained by drilling from the sea
• bed surface a plurality of drilling holes ending in the tunnel and having a total flow cross section which in hydrodynamic respect is corresponding at least to the cross section of the tunnel.
• the tunnel is filled with water before establish ⁇ ing the through-flow-connection.
• the drilling operation is carried out preferably from a floating or semi- submergeable drilling vessel or the like and drilling templates are used to line.
• method according to the invention is applicable for vertical drilling as well as for inclined drilling.
• the invention solves the problems in a simple and safe manner in the previously known flow communication establishing methods. Instead of carrying out the
• Fig. 1 is illustrating diagramatically a vertical
• fig. 2 is illustrating inclined drilling
• fig. 3 is illustrating mounting of the drilling line for a inclined drilling operation
• fig. 4 is showing diagramatically a drilling template
• Fig. 1 shows a vertical cross section formation 3 . 00073
• a cold water tunnel for an ocean thermal energy plant.
• an energy plant e.g. of 5 MW, it can be suitable to provide a tunnel for receiving cold water
• the number of drilling holes 8 is determined by the necessary cross section. A cave for rock drilled out and blasting rock rest if any, is shown at 9. The normal maximum diameter in crude oil industry is at the present
• the hole length will depend on the geometry of the rock surface (sea bed) and the geography of the tunnel.
• Fig. 2 is illustrating an alternative method.
• the drill holes 8 are drilled obliquely in order to obtain better flowing conditions at the inlet to the tunnel 3
• the drilling template 6 is provided with a guide funnel 10 which is pivotably journaled at 11.
• the drilling string is extending along an arcuade path from the drilling vessel 5 to the guide funnel 10
• the template can be made with as many guides as necessary for drilling holes in the sea bed, however, it can also be provided
• the guide funnel 10 may also be arranged for rotary movement so that ar..
• Fig. 3 illustrates a method for adapting the drilling string for inclined drilling.
• the drilling template 6 is provided with a guide funnel 10 for accomodating the lowermost portion of the drilling string (see also fig.
• Fig. 4 shows diagramatically a drilling template
• frame 6 shaped as a sledge (sled) for moving across a sea bed and provided with a pivotable guide funnel 10 as also shown in fig. 2.

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Geology (AREA)
• Mining & Mineral Resources (AREA)
• Physics & Mathematics (AREA)
• Environmental & Geological Engineering (AREA)
• Fluid Mechanics (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Geochemistry & Mineralogy (AREA)
• Earth Drilling (AREA)
• Building Environments (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=19887963

Family Applications (1)

Country Status (5)

Citations (2)

• 1984
  • 1984-11-28 NO NO844729A patent/NO844729L/no unknown
• 1985
  • 1985-11-27 AU AU51940/86A patent/AU5194086A/en not_active Abandoned
  • 1985-11-27 EP EP85906091A patent/EP0202310A1/en not_active Withdrawn
  • 1985-11-27 WO PCT/NO1985/000073 patent/WO1986003253A1/en unknown
  • 1985-11-28 CU CU1985213A patent/CU21793A3/es unknown

Patent Citations (2)

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