WO2015174851A1 - Device and method for collecting oil from tubulars being retracted from a wellbore - Google Patents
Device and method for collecting oil from tubulars being retracted from a wellbore Download PDFInfo
- Publication number
- WO2015174851A1 WO2015174851A1 PCT/NO2015/050081 NO2015050081W WO2015174851A1 WO 2015174851 A1 WO2015174851 A1 WO 2015174851A1 NO 2015050081 W NO2015050081 W NO 2015050081W WO 2015174851 A1 WO2015174851 A1 WO 2015174851A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fluid
- well
- pipe
- well pipe
- sheath
- 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.)
- Ceased
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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
- E21B43/01—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
- E21B43/0122—Collecting oil or the like from a submerged leakage
Definitions
- the invention relates to a device and a method for collecting fluid from a well pipe, which is being pulled out of a well, more specifically from a riserless well.
- riserless mud recovery system In subsea exploration and production drilling for hydrocarbons a so-called riserless mud recovery system is sometimes used, wherein there is no riser extending between a surface installation and a wellhead on the seabed, and wherein the return flow of drilling mud runs through a hose connection from the wellhead to the surface installation.
- a drawback to a riserless system is that the withdrawal of a drill pipe, casing or production tubing from the borehole through the wellhead may result in pollution of the water mass around the wellhead as the surface of the pipe string may have remains of a coating of drilling mud, well-completion fluid, oil and so on, even if the wellhead includes means which are to retain such liquids by scraping or the like for collection in a closed system in association with the wellhead.
- US2013126182A1 discloses a riserless system having flexible choke and kill lines arranged between a subsea BOP and a mobile offshore drilling unit (MODU).
- Means for drill string guidance and cleaning are provided for inserting or taking out the drill string from the BOP.
- a collecting unit is provided underneath the cleaning means but above the BOP to control the leakage of fluid from the outside of the drill string into the seawater. Recovered fluid is returned to the MODU by means of a subsea pump.
- US4399869A discloses a method and an apparatus for removing drilling mud and other substances from the outside surfaces of drill pipe as the drill pipe is removed from a wellbore. This implies locating an inflatable ring-shaped wiping member formed of a resilient material over the well bore encircling the drill string. The wiping member is inflated by a gas pressurized to a level wherein the wiping member is brought in contact with the drill pipe in a controlled manner. The pipe is pulled through the wiping member thereby wiping drilling mud and other substances off the drill pipe.
- the invention has for its object to remedy or reduce at least one of the drawbacks of the prior art or at least provide a useful alternative to the prior art.
- the object is achieved through features, which are specified in the description below and in the claims that follow.
- the invention provides a device for forming a barrier between a pipe string, which is located above a wellhead and about to be pulled out of a well and an adjacent water mass.
- the device includes a magazine, for example a holder, which accommodates a fluid-tight sheath, which is folded up in its axial direction, an open centre passage being maintained through the folded-up sheath.
- the magazine is arranged at the top of the wellhead, and the pipe string, which is to be pulled out of the well extends through the centre passage of the folded-up sheath.
- the sheath In an extended state, the sheath has a length, which is preferably at least equal to the distance from the wellhead up to the surface installation. At least in a phase for connection to the pipe string, an upper end of the sheath is connected to an attachment means, which is arranged to attach the upper end of the sheath to the pipe string.
- an attachment means which is arranged to attach the upper end of the sheath to the pipe string.
- a lower end of the sheath is attached in a fluid-tight manner by its periphery to the magazine or an underlying structure.
- a fluid receptacle may be arranged, which is in fluid communication with the interior of the sheath and is drained to the surface installation via an evacuation plant including a pump and a level-regulation system. Liquids and other things that are present between the pipe string and the sheath and that have a tendency to sink down towards the wellhead over time may thereby be collected and removed from the wellhead, for example by pumping to the surface installation through the drilling-mud return line or a separate pumping line.
- the fluid receptacle is funnel-shaped with an open bottom portion.
- the invention relates more specifically to a device for collecting fluid from a well pipe, which is being pulled out of a well, characterized by
- the collecting device being arranged above a wellhead and being provided with a centre opening extending through it, coaxially with the centre axis of the well;
- the collecting device including a magazine which is arranged above a fluid receptacle and accommodates a folded-up, fluid-tight sheath encircling the centre opening, the periphery of a lower sheath end portion being connected in a fluid-tight manner to the fluid receptacle, and the periphery of an upper sheath end portion being connected to an attachment arranged to be attached to the jacket surface of the pulling pipe or the well pipe.
- the fluid receptacle may be a funnel with an open bottom portion.
- the advantage of this is that a surrounding water mass may initially fill the fluid receptacle, this water mass successively being displaced out of the open bottom portion as the lighter hydrocarbon-containing fluid fills the fluid receptacle from its opening towards the sheath.
- a pumping line may be connected in a fluid-communicating manner to the fluid receptacle.
- the advantage of this is that the hydrocarbon-containing fluid may be kept separate from the surrounding water mass independently of how much fluid is drained to the fluid receptacle.
- the fluid receptacle may be provided with a level-regulation system arranged to regulate the contents of the receptacle of fluid received from the well pipe.
- a level-regulation system arranged to regulate the contents of the receptacle of fluid received from the well pipe.
- the invention relates more specifically to a method of collecting fluid from a well pipe, which is being pulled out of a well, characterized by the method including the following steps: arranging a fluid-tight sheath folded up around a centre opening in a collecting device; positioning the collecting device above a wellhead;
- the method may include the further step of:
- the method may include the further steps of:
- Figure 1 shows, in a side view and partially in axial section, a wellhead provided with a collecting device according to the invention in an early phase of pulling out a well pipe;
- Figure 2 shows, in a side view and partially in axial section, a wellhead provided with a collecting device according to the invention in a later phase of pulling out a well pipe; and
- Figure 3 shows a section of figure 1 on a larger scale.
- the reference numeral 1 indicates a subsea well in which a wellhead 1 1 is established on a seabed 41 under a water mass 5.
- the wellhead 1 1 includes a Christmas tree 1 1 1 , typically a blowout preventer and other valves of a kind known per se.
- a casing 12 and a well pipe 13, for example production tubing, extend downwards in a borehole in an underground 4.
- the well 1 forms part of a so-called riserless system in which fluids are carried in a manner known per se from the wellhead 1 1 to a surface installation not shown or a land facility via fluid lines not shown.
- a pulling pipe 2 extends from the wellhead 1 1 , where it is temporarily connected to the well pipe 13, to a surface installation not shown.
- the pulling pipe 2 is used to pull the well pipe 13 through the wellhead 1 1 and out of the well 1 .
- a collecting device 3 On top of the Christmas tree 1 1 1 1 a collecting device 3 is arranged, including a fluid receptacle 31 , typically a collecting funnel defining a volume above the wellhead Christmas tree 1 1 1 upwards.
- the fluid receptacle 31 has an open bottom portion 312 and is provided, at a distance above the bottom portion 312, with a pumping line 31 1 connecting the interior of the fluid receptacle 31 with a pump not shown and a reservoir arranged, for example, on a surface installation not shown.
- a level- regulation system 313, shown schematically here, is connected in terms of signals to the pump not shown.
- the level-regulation system 313 includes means arranged to indicate when the level of hydrocarbon-containing fluid has reached a certain level above the bottom portion of the fluid receptacle 31 .
- the collecting device 3 has a centre opening 314 extending through it, which is coaxial with the centre opening of the wellhead 1 1 .
- a magazine 32 accommodating a fluid-tight sheath 321 which is folded up in its axial direction is arranged, an open centre passage having been maintained through the folded-up sheath 321 , coinciding with the centre opening 314 to enable the pulling pipe 2 and the well pipe 13 to pass through the folded-up sheath 321 .
- An upper end portion 324 (see figure 3) of the sheath 321 is connected to a sheath attachment 322, for example a clamping device which is arranged to be attached to a portion of the pulling pipe 2 or the well pipe 13.
- the magazine 32 is at least arranged to retain the folded-up portion of the sheath 321 while the sheath 321 is being pulled out through an upper portion of the centre opening 314 of the collecting device 3.
- a lower end portion 323 (see figure 3) of the sheath 321 is attached in a fluid-sealing manner to a lower portion of the magazine 32 but may just as soon be attached to an upper portion of the collecting funnel 31 . It may be an advantage if the magazine 32 fits tightly around the folded-up sheath 321 with the exception of an upper opening towards the surrounding water mass 5 and a lower opening towards the fluid receptacle 31 , in order thereby to prevent the folded-up sheath 321 from becoming damaged.
- the upper end portion 324 of the sheath 321 is attached to the pulling pipe 2 or to an upper portion 131 (see figure 3) of the well pipe 13 by means of the sheath attachment 322.
- This operation may be carried out by means of, for example, a remotely operated vehicle (ROV) not shown.
- ROV remotely operated vehicle
- the well pipe 13 and the accompanying sheath 321 are then pulled out of the well as the sheath 321 is successively pulled out of the magazine 32 through the centre opening 314, forming a fluid-tight barrier between the well pipe 13 and the water mass 5.
- hydrocarbon-containing fluid residues will gather in the upper portion of the fluid receptacle 31 and be prevented from escaping through the open bottom portion 312 by the level-regulation system 313 controlling the evacuation of fluid residues from the collecting funnel 31 .
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
A device (3) for collecting fluid from a well pipe (13), which is being pulled out of a well (1) is described, in which the collecting device (3) is arranged above a wellhead (1 1) and is provided with a centre opening (314) extending through it, coaxially with the centre axis of the well (1 ); and the collecting device (3) includes a magazine (32), which is arranged above a fluid receptacle (31) and accommodates a folded-up, fluid-tight sheath (321) encircling the centre opening (314), the periphery of a lower sheath end portion (324) being connected in a fluid-tight manner to the fluid receptacle (31) and the periphery of an upper sheath end portion (323) being connected to an attachment (322) arranged to be attached to the jacket surface of the pulling pipe (2) or of the well pipe (13). A method for collecting fluid from a well pipe (13), which is being pulled out of a well (1) is described as well.
Description
DEVICE AND METHOD FOR COLLECTING OIL FROM TUBULARS BEING RETRACTED FROM A WELLBORE
The invention relates to a device and a method for collecting fluid from a well pipe, which is being pulled out of a well, more specifically from a riserless well.
In subsea exploration and production drilling for hydrocarbons a so-called riserless mud recovery system is sometimes used, wherein there is no riser extending between a surface installation and a wellhead on the seabed, and wherein the return flow of drilling mud runs through a hose connection from the wellhead to the surface installation. A drawback to a riserless system is that the withdrawal of a drill pipe, casing or production tubing from the borehole through the wellhead may result in pollution of the water mass around the wellhead as the surface of the pipe string may have remains of a coating of drilling mud, well-completion fluid, oil and so on, even if the wellhead includes means which are to retain such liquids by scraping or the like for collection in a closed system in association with the wellhead.
US2013126182A1 discloses a riserless system having flexible choke and kill lines arranged between a subsea BOP and a mobile offshore drilling unit (MODU). Means for drill string guidance and cleaning are provided for inserting or taking out the drill string from the BOP. A collecting unit is provided underneath the cleaning means but above the BOP to control the leakage of fluid from the outside of the drill string into the seawater. Recovered fluid is returned to the MODU by means of a subsea pump.
US4399869A discloses a method and an apparatus for removing drilling mud and other substances from the outside surfaces of drill pipe as the drill pipe is removed from a wellbore. This implies locating an inflatable ring-shaped wiping member formed of a resilient material over the well bore encircling the drill string. The wiping member is inflated by a gas pressurized to a level wherein the wiping member is brought in contact with the drill pipe in a controlled manner. The pipe is pulled through the wiping member thereby wiping drilling mud and other substances off the drill pipe.
The invention has for its object to remedy or reduce at least one of the drawbacks of the prior art or at least provide a useful alternative to the prior art.
The object is achieved through features, which are specified in the description below and in the claims that follow.
The invention provides a device for forming a barrier between a pipe string, which is located above a wellhead and about to be pulled out of a well and an adjacent water mass. The device includes a magazine, for example a holder, which accommodates a fluid-tight sheath, which is folded up in its axial direction, an open centre passage being maintained through the folded-up sheath. The magazine is arranged at the top of the wellhead, and the pipe string, which is to be pulled out of the well extends through the centre passage of the folded-up sheath.
In an extended state, the sheath has a length, which is preferably at least equal to the distance from the wellhead up to the surface installation. At least in a phase for connection to the pipe string, an upper end of the sheath is connected to an attachment means, which is arranged to attach the upper end of the sheath to the pipe string. When the pipe string is being pulled out of the well, the sheath is pulled successively out of the magazine, enclosing the pipe string projecting upwards. Liquids and so on present on the surface of the pipe string will thereby be kept separate from the surrounding water mass.
A lower end of the sheath is attached in a fluid-tight manner by its periphery to the magazine or an underlying structure. Between the magazine and the wellhead, a fluid receptacle may be arranged, which is in fluid communication with the interior of the sheath and is drained to the surface installation via an evacuation plant including a pump and a level-regulation system. Liquids and other things that are present between the pipe string and the sheath and that have a tendency to sink down towards the wellhead over time may thereby be collected and removed from the wellhead, for example by pumping to the surface installation through the drilling-mud return line or a separate pumping line. In one embodiment, the fluid receptacle is funnel-shaped with an open bottom portion.
In a first aspect, the invention relates more specifically to a device for collecting fluid from a well pipe, which is being pulled out of a well, characterized by
the collecting device being arranged above a wellhead and being provided with a centre opening extending through it, coaxially with the centre axis of the well; and
the collecting device including a magazine which is arranged above a fluid receptacle and accommodates a folded-up, fluid-tight sheath encircling the centre opening, the periphery of a lower sheath end portion being connected in a fluid-tight manner to the fluid receptacle, and the periphery of an upper sheath end portion being connected to an attachment arranged to be attached to the jacket surface of the pulling pipe or the well pipe.
The fluid receptacle may be a funnel with an open bottom portion. The advantage of this is that a surrounding water mass may initially fill the fluid receptacle, this water mass successively being
displaced out of the open bottom portion as the lighter hydrocarbon-containing fluid fills the fluid receptacle from its opening towards the sheath.
A pumping line may be connected in a fluid-communicating manner to the fluid receptacle. The advantage of this is that the hydrocarbon-containing fluid may be kept separate from the surrounding water mass independently of how much fluid is drained to the fluid receptacle.
The fluid receptacle may be provided with a level-regulation system arranged to regulate the contents of the receptacle of fluid received from the well pipe. The advantage of this is that the interface between the fluid received and the underlying water mass in the fluid receptacle may be kept at a prescribed lower level independently of the amount of hydrocarbon-containing fluid drained from the well pipe into the fluid receptacle.
In a second aspect, the invention relates more specifically to a method of collecting fluid from a well pipe, which is being pulled out of a well, characterized by the method including the following steps: arranging a fluid-tight sheath folded up around a centre opening in a collecting device; positioning the collecting device above a wellhead;
pulling an upper end portion of the well pipe through the centre opening of the collecting device;
connecting the periphery of an upper sheath end portion in a fluid-tight manner to an upper portion of the well pipe or an adjacent portion of the pulling pipe; and
pulling the well pipe out of the well, the sheath successively enclosing the well pipe.
The method may include the further step of:
draining fluid from the well pipe via a fluid receptacle arranged in the collecting device.
The method may include the further steps of:
filling the fluid receptacle with fluid from the well pipe by successively displacing a water mass through an open bottom portion of the fluid receptacle; and
regulating the interface against the underlying water mass by means of a level-regulation system connected to a pumping line.
In what follows, an example of a preferred embodiment is described, which is visualized in the accompanying drawings, in which:
Figure 1 shows, in a side view and partially in axial section, a wellhead provided with a collecting device according to the invention in an early phase of pulling out a well pipe;
Figure 2 shows, in a side view and partially in axial section, a wellhead provided with a collecting device according to the invention in a later phase of pulling out a well pipe; and
Figure 3 shows a section of figure 1 on a larger scale.
In the figures, the reference numeral 1 indicates a subsea well in which a wellhead 1 1 is established on a seabed 41 under a water mass 5. The wellhead 1 1 includes a Christmas tree 1 1 1 , typically a blowout preventer and other valves of a kind known per se. A casing 12 and a well pipe 13, for example production tubing, extend downwards in a borehole in an underground 4. The well 1 forms part of a so-called riserless system in which fluids are carried in a manner known per se from the wellhead 1 1 to a surface installation not shown or a land facility via fluid lines not shown.
A pulling pipe 2 extends from the wellhead 1 1 , where it is temporarily connected to the well pipe 13, to a surface installation not shown. The pulling pipe 2 is used to pull the well pipe 13 through the wellhead 1 1 and out of the well 1 .
On top of the Christmas tree 1 1 1 a collecting device 3 is arranged, including a fluid receptacle 31 , typically a collecting funnel defining a volume above the wellhead Christmas tree 1 1 1 upwards. The fluid receptacle 31 has an open bottom portion 312 and is provided, at a distance above the bottom portion 312, with a pumping line 31 1 connecting the interior of the fluid receptacle 31 with a pump not shown and a reservoir arranged, for example, on a surface installation not shown. A level- regulation system 313, shown schematically here, is connected in terms of signals to the pump not shown. The level-regulation system 313 includes means arranged to indicate when the level of hydrocarbon-containing fluid has reached a certain level above the bottom portion of the fluid receptacle 31 . The collecting device 3 has a centre opening 314 extending through it, which is coaxial with the centre opening of the wellhead 1 1 .
At the top of the fluid receptacle 31 a magazine 32 accommodating a fluid-tight sheath 321 which is folded up in its axial direction is arranged, an open centre passage having been maintained through the folded-up sheath 321 , coinciding with the centre opening 314 to enable the pulling pipe 2 and the well pipe 13 to pass through the folded-up sheath 321 . An upper end portion 324 (see figure 3) of the sheath 321 is connected to a sheath attachment 322, for example a clamping device which is arranged to be attached to a portion of the pulling pipe 2 or the well pipe 13. The magazine 32 is at least arranged to retain the folded-up portion of the sheath 321 while the sheath 321 is being pulled out through an upper portion of the centre opening 314 of the collecting device 3. A lower end portion 323 (see figure 3) of the sheath 321 is attached in a fluid-sealing manner to a lower portion of the magazine 32 but may just as soon be attached to an upper portion of the collecting funnel 31 . It may be an advantage if the magazine 32 fits tightly around the folded-up sheath 321 with the exception of an upper opening towards the surrounding water mass 5 and a lower opening towards the fluid receptacle 31 , in order thereby to prevent the folded-up sheath 321 from becoming damaged.
When a well pipe 13 is to be pulled out of the well 1 and through the water mass 5, the upper end portion 324 of the sheath 321 is attached to the pulling pipe 2 or to an upper portion 131 (see figure
3) of the well pipe 13 by means of the sheath attachment 322. This operation may be carried out by means of, for example, a remotely operated vehicle (ROV) not shown. The well pipe 13 and the accompanying sheath 321 are then pulled out of the well as the sheath 321 is successively pulled out of the magazine 32 through the centre opening 314, forming a fluid-tight barrier between the well pipe 13 and the water mass 5.
Even if the wellhead 1 1 is provided with means for removing a fluid coating from the outside of the well pipe 13, there will always be some fluid coating joining the well pipe out of the wellhead Christmas tree 1 1 1 . Any fluid residues present on the jacket surface of the well pipe 13 will be prevented by the sheath 321 from mixing with the water mass 5, and, with the help of gravity, flowing fluid residues will land in the fluid receptacle 31 , where the fluid residues may be drained to the surface installation, not shown, via the pumping line 31 1 . As hydrocarbons are lighter than water, hydrocarbon-containing fluid residues will gather in the upper portion of the fluid receptacle 31 and be prevented from escaping through the open bottom portion 312 by the level-regulation system 313 controlling the evacuation of fluid residues from the collecting funnel 31 .
Claims
1 . A device (3) for collecting fluid from a well pipe (13), which is being pulled out of a well (1), c h a r a c t e r i z e d i n that
the collecting device (3) is arranged above a wellhead (1 1) and is provided with a centre opening (314) extending through it, coaxially with the centre axis of the well (1); and
the collecting device (3) includes a magazine (32) which is arranged above a fluid receptacle (31) and accommodates a folded-up, fluid-tight sheath (321) encircling the centre opening (314), the periphery of a lower sheath end portion (324) being connected in a fluid-tight manner to the fluid receptacle (31) and the periphery of an upper sheath end portion (323) being connected to an attachment (322) arranged to be attached to the jacket surface of the pulling pipe (2) or the well pipe (13).
2. The device (3) according to claim 1 , wherein the fluid receptacle (31) is a funnel with an open bottom portion (312).
3. The device (3) according to claim 1 , wherein a pumping line (31 1) is connected in a fluid-communicating manner to the fluid receptacle (31).
4. The device (3) in accordance with claim 1 , wherein the fluid receptacle (31) is provided with a level-regulation system (313) arranged to regulate the contents of the fluid receptacle (31) of fluid received from the well pipe (13).
5. A method of collecting fluid from a well pipe (13), which is being pulled out of a well (1), c h a r a c t e r i z e d i n that the method includes the following steps: arranging a fluid-tight sheath (321) folded up around a centre opening (314) in a collecting device (3);
positioning the collecting device (3) above a wellhead (1 1);
pulling an upper end portion (131) of the well pipe (13) through the centre opening (314) of the collecting device (3);
connecting the periphery of an upper sheath end portion (324) in a fluid-tight manner to an upper portion (131) of the well pipe (13) or an adjacent portion of the pulling pipe (2); and
pulling the well pipe (13) out of the well (1), the sheath successively enclosing the well pipe (13).
6. The method according to claim 5, wherein the method includes the further step of:
draining fluid from the well pipe (13) via a fluid receptacle (31) arranged in the collecting device (3).
7. The method according to claim 5, wherein the method includes the further steps of: filling the fluid receptacle (31) with fluid from the well pipe (13) by successively displacing a water mass (5) through an open bottom portion (312) of the fluid receptacle; and
- regulating the interface against the underlying water mass (5) by means of a level-regulation system (313) connected to a pumping line (31 1).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO20140619A NO20140619A1 (en) | 2014-05-15 | 2014-05-15 | Apparatus and method for collecting oil from pipes extracted from a well |
| NO20140619 | 2014-05-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2015174851A1 true WO2015174851A1 (en) | 2015-11-19 |
Family
ID=54480285
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/NO2015/050081 Ceased WO2015174851A1 (en) | 2014-05-15 | 2015-05-13 | Device and method for collecting oil from tubulars being retracted from a wellbore |
Country Status (2)
| Country | Link |
|---|---|
| NO (1) | NO20140619A1 (en) |
| WO (1) | WO2015174851A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110005363A (en) * | 2019-04-09 | 2019-07-12 | 中国石油天然气股份有限公司 | A wellhead anti-splash device for oil and water well operations |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4149603A (en) * | 1977-09-06 | 1979-04-17 | Arnold James F | Riserless mud return system |
| GB1584888A (en) * | 1977-01-18 | 1981-02-18 | Salzgitter Maschinen Ag | Rock drilling apparatus |
| US5540283A (en) * | 1995-03-20 | 1996-07-30 | Atlantic Richfield Company | Well pumping |
| US20130126182A1 (en) * | 2010-07-30 | 2013-05-23 | Ocean Riser Systems As | Riserless, pollutionless drilling system |
-
2014
- 2014-05-15 NO NO20140619A patent/NO20140619A1/en not_active Application Discontinuation
-
2015
- 2015-05-13 WO PCT/NO2015/050081 patent/WO2015174851A1/en not_active Ceased
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1584888A (en) * | 1977-01-18 | 1981-02-18 | Salzgitter Maschinen Ag | Rock drilling apparatus |
| US4149603A (en) * | 1977-09-06 | 1979-04-17 | Arnold James F | Riserless mud return system |
| US5540283A (en) * | 1995-03-20 | 1996-07-30 | Atlantic Richfield Company | Well pumping |
| US20130126182A1 (en) * | 2010-07-30 | 2013-05-23 | Ocean Riser Systems As | Riserless, pollutionless drilling system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110005363A (en) * | 2019-04-09 | 2019-07-12 | 中国石油天然气股份有限公司 | A wellhead anti-splash device for oil and water well operations |
Also Published As
| Publication number | Publication date |
|---|---|
| NO20140619A1 (en) | 2015-11-16 |
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