GB2134566A - Method for drilling subsea hydrocarbon wells - Google Patents
Method for drilling subsea hydrocarbon wells Download PDFInfo
- Publication number
- GB2134566A GB2134566A GB08402336A GB8402336A GB2134566A GB 2134566 A GB2134566 A GB 2134566A GB 08402336 A GB08402336 A GB 08402336A GB 8402336 A GB8402336 A GB 8402336A GB 2134566 A GB2134566 A GB 2134566A
- Authority
- GB
- United Kingdom
- Prior art keywords
- drill guide
- platform
- ocean
- guide platform
- drilling
- 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
- 238000005553 drilling Methods 0.000 title claims abstract description 101
- 239000004215 Carbon black (E152) Substances 0.000 title claims abstract description 38
- 229930195733 hydrocarbon Natural products 0.000 title claims abstract description 38
- 150000002430 hydrocarbons Chemical class 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000000694 effects Effects 0.000 claims description 6
- 230000003466 anti-cipated effect Effects 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000002184 metal Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000009189 diving Effects 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 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
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
- E21B43/017—Production satellite stations, i.e. underwater installations comprising a plurality of satellite well heads connected to a central station
-
- 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
- E21B7/128—Underwater drilling from floating support with independent underwater anchored guide base
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)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
A method is disclosed for using a submerged drill guide platform 10 in the drilling and completion of subsea hydrocarbon wells. The method generally comprises securing a submerged drill guide platform on the ocean floor 14, moving a floating drilling platform 26 into position on the surface of the ocean above the submerged drill guide platform, extending a drill string 24 downwardly from said floating drilling platform, extending said drill string through a subsea drilling template 18 mounted on the top of said drill guide platform 10 and through a tubular drill guide 22 mounted on said submerged drill guide platform and conducting drilling operations through said tubular drill guide on said drill guide platform. <IMAGE>
Description
SPECIFICATION
Method for drilling subsea hydrocarbon wells
This invention relates to an improved method for using a drill guide platform in the drilling and completion of subsea hydrocarbon wells.
In subsea drilling operations in the oil and gas industry the use of drilling platforms is well known. A drilling platform generally consists of a tower-like support structure having a bottom which rests upon the floor of the ocean and an equipment deck mounted on top of said tower-like support structure. The drilling and production equipment used in drilling and completing the well and in producing hydrocarbon products such as oil or gas from the well is mounted on the equipment deck of the drilling platform. When offshore drilling operations are conducted in relatively shallow depths of water it is relatively easy to use drilling platforms that rest upon the floor of the ocean and support the equipment deck above the surface of the ocean.Of course, drilling platforms that extend above the surface of the ocean must have sufficient strength and rigidity to resist the action of the ocean's waves even during the most violent storms. When offshore drilling operations are conducted in deeper water the tower-like support structures of the drilling platforms must be correspondingly taller and proportionately larger to support the equipment deck above the surface of the ocean and to withstand wave action.
An alternate method for drilling and completing subsea hydrocarbon wells utilizes floating drilling vessels in conjunction with subsea templates and subsea wellhead equipment. In this method a subsea drilling template is first installed on the floor of the ocean at the well site. As is well known in the prior art, subsea templates generally comprise a metal frame having portions defining a number of vertically aligned drilling apertures extending through said template. A subsea template provides the base through which the subsea hydrocarbon wells are drilled and completed and serves to space and align the subsea wellhead equipment.
After the subsea template is installed upon the floor of the ocean, a floating drilling vessel such as a semi-submersible or jack-up drilling platform is positioned over the template. A drill string is then extended downwardly from the drilling platform and guided through one of the vertically aligned apertures of the subsea template which rests upon the floor of the ocean. A number of similar wells may be drilled through each of the remaining apertures of the subsea template. When a well which has been drilled through the subsea template has been completed, the drill string is removed and the subsea wellhead equipment mounted on the subsea template is connected to the well to bring the well into production.A subsea pipeline connected to the subsea well head equipment on the subsea template carries the oil or gas produced from the completed wells to a production facility on shore or to a production facility on a fixed or floating surface platform.
Because of the subsea wellhead equipment mounted on the subsea template must be periodically serviced by divers descending from the surface of the ocean, affixing the subsea template to the ocean floor may not be convenient in deep water. This is due to the fact that at depths exceeding approximately six hundred feet it is increasingly difficult for divers to operate for sufficiently long periods of time to efficiently perform the necessary maintenance work.
The method of the present invention contemplates using a submerged drilling platform for elevating the subsea drilling template and associated equipment to a point above the floor of the ocean that is within the convenient diving and working range of divers who must work on the subsea drilling template and associated equipment but which is sufficiently far below the surface of the ocean to avoid most surface turbulence. Said submerged drilling platform is provided with tubular drill guides extending from the top of said drilling platform to the bottom of said drilling platform for guiding the direction of the wells drilled through the subsea drilling templates mounted on said submerged drilling platform. The drilling platform with tubular drill guides may be referred to as a drill guide platform.
In addition to providing ready access to the subsea drilling template and associated equipment, the use of a submerged drilling platform results in great cost savings due to the fact that the ocean's waves will normally have little effect on a submerged drilling platform.
Therefore, the tower-like structure of the submerged drilling platform will not require the size, strength and rigidity of a platform which would extend to the surface of the ocean.
The use of a submerged drill guide platform as described above also permits the more efficient exploitation and development of subsea hydrocarbon resources by permitting an increase in the number of subsea hydrocarbon wells that may be drilled and completed within a given subsea area. It is well known in the oil and gas producing industry that in order to get good well converage in a subsea hydrocarbon reservoir, one may cause some of the drill strings of the wells drilled through a subsea drilling template to be deviated from the vertical during drilling operations. This allows one to complete the wells at a subsurface point which may be displaced horizontally several thousand feet from an imaginary line that descends vertically into the earth from directly beneath the subsea drilling template.The horizontal distance from said vertical line to the completion point of the deviated well is referred to as the "throw distance".
By carefully selecting the appropriate angles of deviation for the deviated wells, one can cause the completion points of the deviated wells to be spread over a large area of the reservoir in which the drilling operations are being conducted. In practice, the locations of the completion points of the wells are spaced so that the area of the reservoir that each well drains is adjacent to the other drainage areas of the other wells. To obtain the maximum production of hydrocarbon products from the reservoir, the drainage of areas of the completed wells should be as closely packed together as possible for efficient reservoir drainage. That is, the peripheral boundary of each drainage area of each completed well in the reservoir should touch the peripheral boundaries of as many adjacent drainage areas as possible to cover as much of the total area of the reservoir as is possible.
By using a submerged drill guide platform to elevate the subsea drilling template and associated equipment to a height above the floor of the ocean, it is possible to increase the height above the level of the subsea reservoir from which the deviation of the wells may be begun.
Specifically, the drill string of a well passing through the subsea drilling template may be significantly deviated by directing the drill string through a curved tubular drill guide mounted on the submerged drill guide platform. The direction of the drill string can thus be deviated before the drill string reaches the floor of the ocean. The additional deviation achievable by using a submerged drill guide platform to so deviate the drill string increases the "throw distance" that is attainable in a given subsea area from a given subsea drilling template. An increase in the horizontal extent of reservoir drainage area may be accomplished with this technique thereby yielding an increase in the number of subsea wells that may be drilled and completed.
It is an object of the invention to provide a method for using a submerged drill guide platform in which a subsea drilling template and associated equipment is elevated above the bottom of the ocean floor to permit said subsea template to be readily accessible to divers descending from the surface of the ocean.
It is a further object of the invention to provide a method for using a submerged drill guide platform in which a subsea drilling template and associated equipment is elevated above the bottom of the ocean floor and said subsea drilling template and associated equipment is supported in the ocean at a depth not appreciably affected by the action of the ocean's waves.
It is still a further object of the invention to provide a method for using submerged drill guide platforms to more efficiently exploit and develop subsea hydrocarbon resources by increasing the number of subsea hydrocarbon wells that may be drilled and completed while maintaining the drainage area per well.
It is another object of the invention to provide a method for using a submerged drill guide platform to increase the number of subsea hydrocarbon wells that may be drilled and completed.
It is an additional object of the invention to provide a method for using a submerged drill guide platform in which a subsea drilling template and associated equipment is elevated above the bottom of the ocean floor to permit the use of curved tubular guides for deviating the drill strings of subsea hydrocarbon wells drilled through said template.
These and other objects and features of advantage of the invention will be apparent from the drawings, the detailed description and the appended claims.
In the drawings in which is shown a preferred embodiment the invention may assume, and in which like numerals indicate like parts,
Figure 1 is a schematic side elevational view of a floating drilling vessel conducting drilling operations through a submerged drill guide platform and through a subsea drilling template mounted on the top of said drill guide platform and schematically showing curved tubular drill guides mounted within said drill guide platform for deviating the direction of the drill string of the wells drilled through said subsea drilling template;;
Figure 2 is a graph of subsurface vertical depth in feet versus throw distance in feet showing representative values of completion depths and throw distances for a well drilled through a subsea drilling template on the bottom of the ocean and for a well drilled through a subsea drilling template mounted on the top of a submerged drill guide platform;
Figure 3 is a schematic plan view of a reservoir drainage area map (320 acre spacing) showing a closely packed array of drainage areas of thirteen subsea hydrocarbon wells drilled from a subsea drilling template mounted on the ocean floor;;
Figure 4 is a schematic plan view of a reservoir drainage area map (320 acre spacing) showing a closely packed array of drainage areas of nineteen subsea hydrocarbon wells drilled from a submerged drill guide platform, and
Figure 5 is a schematic plan view of a series of five submerged drill guide platforms and their respective subsea hydrocarbon wells in which it is schematically shown how the submerged drill guide platforms may be connected via subsea pipelines to production facilities located above the surface of the ocean.
In the drawings the numeral 10 generally designates the submerged drill guide platform used to practice the method of the invention. As shown in Figure 1, the drill guide platform 10 generally comprises a tower-like support structure 12 adapted to be seated on the ocean floor 1 4.
The tower-like support structure 1 2 of the drill guide platform 10 is secured to the ocean floor 1 4 via pilings (not shown) driven through a frame of piling sleeves 1 6 fastened to the base of the tower-like support structure 12.
The top of the tower-like structure 12 of drill guide platform 10 supports a subsea drilling template 1 8 on which is mounted subsea wellhead equipment 20. Submerged drill guide platform 10 is provided with at least one tubular drill guide 22 extending downwardly from the subsea drilling template 1 8 mounted on the top of drill guide platform 10 to the ocean floor 14 beneath drill guide platform 10. A tubular drill guide 22 generally comprises a metal tubular pipe through which a drill string 24 is passed to drill a subsea hydrocarbon weli. Tubular drill guides 22 may be either straight or curved depending on whether vertical drilling or deviated drilling is desired. Figure 1 schematically depicts two curved tubular drill guides 22 mounted within drill guide
platform 10.Any desired number of such tubular drill guides may be utilized, with one such drill guide being provided for each well to be drilled utilizing drill guide platform 1 0.
The dimensions of drill guide platform 10 are chosen so that the subsea drilling template 1 8 and its associated subsea well head equipment 20 are supported at a level which is beneath the surface of the ocean. In the schematic representation of drill guide platform 10 depicted in Figure 1, the subsea drilling template 1 8 is approximately 550 feet below the surface of the ocean. The height of drill guide platform 10 depicted in Figure 1 is approximately 700 feet.
Divers descending from the surface of the ocean can conveniently reach and work on the subsea wellhead equipment 20 mounted on subsea drilling template 1 8 when said equipment is supported at a depth no greater than approximately 600 feet deep. At depths exceeding approximately 600 feet it is increasingly difficult for divers to operate for long periods of time.
Accordingly, the elevation of the subsea drilling template 1 8 and associated wellhead equipment 20 above the bottom of the ocean floor as described above is very advantageous in performing drilling operations in deep water.
An added advantage of using a submerged drill guide platform 10 is that great cost savings may be obtained by submerging the platform at least sufficiently far beneath the ocean's surface so that the ocean's waves, or other surface turbulence effects, will normally have little effect upon it. If so positioned, the submerged drill guide platform 10 does not require the size, strength and rigidity of a drilling platform that extends to the surface of the ocean. It has been determined that the ocean's waves create little disturbance at a depth which is deeper than approximately three times the wave height of an ocean wave. Therefore, the top of the platform 10 is preferably positioned at a depth beneath the ocean's surface which is equal to at least three times the height of the largest storm waves expected to be encountered during the use of the platform.
Those skilled in the art are aware of the maximum storm wave height are anticipated in a given area, often referred to as the "100-year wave height" for a given area, such as the North
Sea. If the maximum anticipated wave height of an ocean wave is approximately 80 feet in extremely strong storm conditions for a given location, then there will be relatively little subsea disturbance, even during such storm conditions, at a depth greater than approximately 240 feet beneath the surface of the ocean. Therefore, the approximate range of depths at which the subsea drilling template 1 8 and subsea wellhead equipment 20 would be supported by submerged drill guide platform 10 in accordance with the preferred method would be from approximately 240 feet deep (to avoid surface turbulence) to approximately 600 feet deep (to provide satisfactory diver access).
In practice, the method of the invention for drilling subsea hydrocarbon wells first requires that submerged drill guide platform 10 be fixedly seated on the ocean floor 14 so that the top of drill guide platform 10 is positioned within the above described range of depths. Next, a floating drilling platform, generally denoted by the numeral 26, is
moved into position on the surface of the ocean above the submerged drill guide platform 10. Drill string 24 is then extended downwardly from floating drilling platform 26 and is threaded through an aperture (not shown) in subsea drilling template 1 8 and through a tubular drill guide 22.
When drill string 24 reaches the ocean floor 1 4 after having passed through tubular drill guide 22 normal drilling operations may be conducted using methods well known in the prior art.
After the wells have been drilled, they are completed at the top of platform 10 using the subsea wellhead equipment 20 mounted on subsea drilling template 1 8. As each well is completed it may be closed while further drilling and completion operations are conducted. The oil, gas and other hydrocarbon products produced from the wells drilled through submerged drill guide platform 10 are then conducted via subsea pipeline 27 to a production facility onshore or to a production facility on a fixed or floating surface platform 40. Submerged drill guide platform 10 remains in place throughout the producing life of the wells drilled and completed through it. After the wells have been exhausted and shut in, drill guide platform 10 is removed for use at another location.
The elevation of subsea drilling template 18 above the surface of the ocean floor 14 permits the drill string 24 of a well drilled through subsea drilling template 18 to be deviated from the vertical by the use of curved tubular drill guides 22 before the drill string 24 reaches the ocean floor 14. By starting the deviation of the drill string 24 at a point several hundred feet above the surface of the ocean floor 14, it is possible to significantly increase the "throw distance" of the deviated well from what it would have been if the deviation was started at the surface of the ocean floor 14.
A comparative example of the increase in "throw distance" that may be available is illustrated in Figure 2. Figure 2 depicts a graph of subsurface vertical depth in feet versus throw distance in feet showing representative values of completion depths and throw distances for a well drilled through a subsea drilling template 28 mounted on the bottom of the ocean floor 14 and for a well drilled through a subsea drilling template 18 mounted on the top of a submerged drill guide platform 10 having a height of 700 feet. As shown in Figure 2, the maximum throw distance at a depth of 6,600 feet total vertical depth beneath the ocean floor 1 4 reached by the well drilled through subsea drilling template 28 mounted on the floor of the ocean 1 4 is approximately 7,000 feet.The maximum throw distance at a depth of 6,600 feet total vertical depth beneath the ocean floor 14 reached by the well drilled from the subsea drilling template 18 mounted on a 700 foot submerged drill guide 10 is approximately 8,500 feet. Because the drill string 24 is deviated by a tubular drill guide 22 before it reaches the ocean floor 14, greater throw distances are obtainable than would be the case if the deviation of drill string 24 did not begin until drill string 24 reached the ocean floor 14.
The additional deviation achievable by using a submerged drill guide platform 10 to deviate the drill strings 24 to increase the throw distance that is obtainable in a given subsea area may be used to increase the horizontal extent of reservoir drairiage that may be accomplished from a given subsea drilling template 18. For example, Figure 3 represents a schematic plan view of a reservoir drainage area map showing the spacing of a closely packed array of individual drainage areas 30 from a grouping of thirteen subsea hydrocarbon wells. The dotted line 32 represents the boundary of the greatest areal extent of reservoir drainage that may be achieved from a subsea drilling template 28 mounted on the floor of the ocean 14.When the drill strings 24 of the wells are deviated before reaching the ocean floor 14 as depicted in Figure 2, it is possible to increase the horizontal distance from the vertical at which the wells may be completed.
Figure 4 illustrates that this feature permits the addition of six subsea hydrocarbon wells to the drilling pattern shown in Figure 3. Figure 4 depicts a schematic plan view of a reservoir drainage area map showing a closely packed array of the drainage areas 30 of nineteen hydrocarbon wells.
The additional six drainage areas 34 are lightly shaded in Figure 4 to show their position with respect to the previously existing drainage areas 30 depicted in Figure 3. As may be seen, the new drainage areas 34 extend beyond the previously indicated boundary 32 thereby increasing the accessible area of the reservoir. The method of the invention therefore permits the more efficient exploitation and development of subsea hydrocarbon reservoirs by permitting an increase in the number of subsea hydrocarbon wells that may be drilled and completed within a given subsea area.
Figure 5 schematically depicts a plan view of five submerged drill guide platforms 10 and the bottom hole locations represented by small circles 36 of their respective subsea hydrocarbon wells.
The bottom hole location of water injection wells represented by small triangles 38 are also depicted. Figure 5 illustrates how a series of submerged drill guide platforms 10 may be used in conjunction to systematically cover a large subsea reservoir area. The dotted lines depicted in
Figure 5 represent subsea pipelines for transporting the oil, gas and other hydrocarbon products from the platforms 10 to production facilities 40 located above the surface of the ocean.
The foregoing disclosure and description of the invention are illustrative and explanatory thereof, and various changes in the size, shape and materials of the construction, as well as in the details of the illustrated method, may be made within the scope of the appended claims without departing from the spirit of the invention.
Claims (6)
1. A method for drilling subsea hydrocarbon wells comprising providing a drill guide platform having at least one tubular drill guide, said drill guide platform adapted to be seated on the ocean floor, positioning said drill guide platform so that the bottom of said drill guide platform is seated on the ocean floor and the top of said drill guide platform is positioned below the surface of the ocean at a depth at which the effect of the ocean's surface turbulence is substantially reduced but not more than approximately six hundred feet deep, positioning a floating drilling platform on the surface of the ocean above the submerged drill guide platform, and conducting drilling operations through at least one tubular drill guide of said drill guide platform.
2. A method for drilling subsea hydrocarbon wells comprising providing a drill guide platform having at least one tubular drill guide, said drill guide platform adapted to be seated on the ocean floor, positioning said drill guide platform so that the bottom of said drill guide platform is seated on the ocean floor and the top of said drill guide platform is positioned below the surface of the ocean at a depth below approximately three times the maximum anticipated wave height of an ocean wave but not deeper than approximately six
hundred feet deep, positioning a floating drilling platform on the surface of the ocean above the submerged drill guide platform, and conducting drilling operations through at least one tubular drill guide of said drill guide platform.
3. A method for drilling subsea hydrocarbon wells comprising providing a drill guide platform
having at least one tubular drill guide, said drill
guide platform adapted to be seated on the ocean floor, positioning said drill guide platform so that the bottom of said drill guide platform is seated on the ocean floor and the top of said drill guide
platform is positioned below the surface of the
ocean at a depth at which the effect of the ocean's
surface turbulence is substantially reduced but not
more than approximately six hundred feet deep,
positioning a floating drilling platform on the
surface of the ocean above the submerged drill
guide platform, conducting drilling operations through at least one tubular drill guide of said drill
guide platform, and completing at the top of said
drill guide platform the subsea hydrocarbon well
drilled through said tubular drill guide.
4. A method for drilling subsea hydrocarbon
wells comprising providing a drill guide platform having at least one curved tubular drill guide, said drill guide platform adapted to be seated on the ocean floor, positioning said drill guide platform so that the bottom of said drill guide platform is seated on the ocean floor and the top of said drill guide platform is positioned below the surface of the ocean at a depth at which the effect of the ocean's surface turbulence is substantially reduced but not more than approximately six hundred feet deep, positioning a floating drilling platform on the surface of the ocean above the submerged drill guide platform, conducting drilling operations through at least one curved tubular drill guide of said drill guide platform, and completing at the top of said drill guide platform the subsea hydrocarbon well drilled through said curved tubular drill guide.
5. A method for drilling subsea hydrocarbon wells comprising:
(a) providing a plurality of drill guide platforms each having at least one curved tubular drill guide, said drill guide platforms adapted to be seated on the ocean floor;
(b) positioning said drill guide platforms so that the bottoms of said drill guide platforms are seated on the ocean floor and the tops of said drill guide platforms are positioned below the surface of the ocean at a depth below approximately three times the maximum anticipated wave height of an ocean wave but not deeper than approximately six hundred feet deep;
(c) positioning a floating drilling platform on the surface of the ocean above one of the submerged drill guide platforms;
(d) conducting drilling operations through at least one curved tubular drill guide of said drill guide platform; ;
(e) completing at the top of said drill guide platform the subsea hydrocarbon well drilled through said curved tubular drill guide;
(f) re-positioning said floating drilling platform above another drill guide platform;
(g) repeating steps (d) through (f) until wells have been completed through a plurality of said drill guide platforms;
(h) connecting said completed wells on each drill guide platform to a subsea pipeline leading to production facilities, and
(i) producing hydrocarbon products conducted through said subsea pipeline.
6. A method for drilling subsea hydrocarbon wells substantially as hereinbefore described.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US46455183A | 1983-02-07 | 1983-02-07 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8402336D0 GB8402336D0 (en) | 1984-02-29 |
| GB2134566A true GB2134566A (en) | 1984-08-15 |
| GB2134566B GB2134566B (en) | 1986-04-09 |
Family
ID=23844381
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08402336A Expired GB2134566B (en) | 1983-02-07 | 1984-01-30 | Method for drilling subsea hydrocarbon wells |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU2382584A (en) |
| GB (1) | GB2134566B (en) |
| NO (1) | NO840438L (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2009815A (en) * | 1977-11-18 | 1979-06-20 | Regan Offshore Int | Moveable guide structure for a subsea drilling template |
| GB2073282A (en) * | 1977-09-12 | 1981-10-14 | Standard Oil Co | Drilling guidance device |
| GB2094856A (en) * | 1981-01-28 | 1982-09-22 | Southeastern Drilling Services | Slip assembly for subsea template |
-
1984
- 1984-01-26 AU AU23825/84A patent/AU2382584A/en not_active Abandoned
- 1984-01-30 GB GB08402336A patent/GB2134566B/en not_active Expired
- 1984-02-06 NO NO840438A patent/NO840438L/en unknown
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2073282A (en) * | 1977-09-12 | 1981-10-14 | Standard Oil Co | Drilling guidance device |
| GB2009815A (en) * | 1977-11-18 | 1979-06-20 | Regan Offshore Int | Moveable guide structure for a subsea drilling template |
| GB2094856A (en) * | 1981-01-28 | 1982-09-22 | Southeastern Drilling Services | Slip assembly for subsea template |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2134566B (en) | 1986-04-09 |
| GB8402336D0 (en) | 1984-02-29 |
| NO840438L (en) | 1984-08-08 |
| AU2382584A (en) | 1984-08-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PE20 | Patent expired after termination of 20 years |
Effective date: 20040129 |