CA2291301A1 - Rotating casing assembly - Google Patents
Rotating casing assembly Download PDFInfo
- Publication number
- CA2291301A1 CA2291301A1 CA 2291301 CA2291301A CA2291301A1 CA 2291301 A1 CA2291301 A1 CA 2291301A1 CA 2291301 CA2291301 CA 2291301 CA 2291301 A CA2291301 A CA 2291301A CA 2291301 A1 CA2291301 A1 CA 2291301A1
- Authority
- CA
- Canada
- Prior art keywords
- casing
- section
- string
- casing string
- casing section
- 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.)
- Abandoned
Links
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000004568 cement Substances 0.000 claims abstract description 8
- 239000012530 fluid Substances 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000011152 fibreglass Substances 0.000 description 2
- 238000011109 contamination Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding 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
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/14—Methods or devices for cementing, for plugging holes, crevices or the like for cementing casings into boreholes
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/08—Casing joints
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (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)
- Mechanical Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
It is common practice to rotate casing in shallow holes (to approx. 1000m).
This has been found to noticeably enhance the bond between the casing and cement thereby decreasing the chance of microchannelling along the casing string. The rotating casing assembly and method, as described herein, allows for rotation of the casing at any depth. Only the lower portion is rotated.
This lower portion is generally that portion crossing the production zone. This method is extremely economical compared to other methods and requires no additional rig time or surface equipment. The casing is driven to rotate by the energy of the fluid being pumped through the casing.
This has been found to noticeably enhance the bond between the casing and cement thereby decreasing the chance of microchannelling along the casing string. The rotating casing assembly and method, as described herein, allows for rotation of the casing at any depth. Only the lower portion is rotated.
This lower portion is generally that portion crossing the production zone. This method is extremely economical compared to other methods and requires no additional rig time or surface equipment. The casing is driven to rotate by the energy of the fluid being pumped through the casing.
Description
ROTATING CASING ASSEMBLY AND METHOD
FIELD OF THE INVENTION
The present invention is directed to an assembly for rotating wellbore casing.
BACKGROUND OF THE INVENTION
In well completion and cementing in of casing, the main problem encountered is how to provide a better cement bond between both the casing and the wellbore and the cement in the annulus to overcome the problem of water migration between various zones, sometimes termed microchannelling.
There are many methods used such as, for example, cement squeezes, setting packers to isolate zones, and using turbolizers. These methods are all quite expensive and complex and not always effective.
It is common practice to rotate casing in shallow holes (to approx. 1000m).
This has been found to noticeably enhance the bond between the casing and the cement thereby decreasing the chance of microchannelling along the casing string.
Rotating has been found to be effective at shallower depths. However, it is not feasible to rotate the casing from surface in deeper holes or in bridged-off portions of the hole.
SUMMARY OF THE INVENTION
An assembly and method has been invented to provide for rotation of a casing section in a zone of interest without requiring rotation of the casing string from surface. Such rotation enhances cementing procedures. The assembly is particularly useful as it permits rotation in zones of interest in which previously casing rotation was difficult such as, for example, in deep sections of the borehole.
The assembly is also useful for rotating through bridged-off portions of the hole.
Thus in accordance with a broad aspect of the present invention, there is provided:
an assembly for connection to a casing string comprising: a casing section connected to the casing string through a bearing device, the bearing device S:1C4\47214443010002-1-app.doc permitting rotation of the casing section relative to the casing string and a means for rotating the casing section relative to the casing string.
The means for rotating the casing section can be a plurality of fins formed on the casing section and positioned to cause rotation of the casing section by action of fluids moving therepast. The fins are preferably formed on the inner surface of the casing section. To provide for removal of the fins should it be desirable to have access therebelow, the fins can be formed of easily drillable material such as aluminum or fiberglass.
In accordance with a further aspect of the present invention, there is provided a method for cementing in a casing section at a zone of interest, comprising:
providing a casing string with a casing section attached thereto and extending across a zone of interest, the casing section and the casing string each having inner bores and the inner bore of the casing section being in communication with the inner bore of the casing string; and pumping cement through the inner bores of the casing string and the casing section while rotating the casing section at an increased rate of rotation than that of the casing string.
In accordance with another aspect of the present invention, there is provided a method for rotating a section of casing a rate different from any rate of rotation of the casing string to which the section of casing is attached; comprising:
providing a casing string and a casing section connected to the casing string through a bearing device, the bearing device permitting rotation of the casing section relative to the casing string and a means for rotating the casing section relative to the casing string;
and actuating the means for rotating to drive the casing section to rotate on the bearing device relative to the casing string.
BRIEF DESCRIPTION OF THE DRAWINGS
A further, detailed, description of the invention, briefly described above, will follow by reference to the following drawings illustrating one embodiment of the invention.
These drawings depict only a typical embodiment of the invention and are therefore not to be considered limiting of its scope. In the drawings:
Figure 1 is a section along a casing string including an assembly according to the present invention.
S:\C4',472\44430\0002-1-app.doc DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The rotating casing assembly according to the present invention allows for rotation of the casing at any depth. Only a selected portion of the casing will be rotated and rotation from surface is not required. The selected portion that is rotated is usually the portion crossing the production zone. This method is extremely economical compared to other methods and requires no additional rig time or surface equipment.
The casing is driven to rotate by the fluid being pumped through it.
In one embodiment as shown in Figure 1, the assembly includes a rotating bearing pack "A" and a section of casing "B" specially made with a series of internal fins.
The rotating bearing pack must be able to carry the weight of the casing below it, be sealed to prevent contamination by well and completion fluids and also to withstand the burst pressure of the casing. The bearing pack can be for example a race of ball bearings sealed within a housing. The bearing pack can be connected in any desirable way such as, for example, by welding or threaded connection between the end of a standard casing string and the section of casing B.
Below the bearing pack is a piece of casing with an internal array of fins that will rotate the casing when fluid is pumped through. The internal fins are shaped andlor positioned to drive the casing to turn freely on the bearing when fluid is pumped past the fins of the casing. To provide drive, the fins can have standard turbine structure and positioning, as would be appreciated.
Preferably the fins are positioned to drive rotation to the left. Left-hand rotation is preferred since should the bearing pack fail the casing string would not come apart.
In a preferred embodiment, the fins are formed of a drillable material such as, for example, aluminum or fiberglass to facilitate removal from the casing string.
It will be apparent that may other changes may be made to the illustrative embodiments, while falling within the scope of the invention and it is intended that all such changes be covered by the claims appended hereto.
S:1C4\472\44430\0002-l-app.doc
FIELD OF THE INVENTION
The present invention is directed to an assembly for rotating wellbore casing.
BACKGROUND OF THE INVENTION
In well completion and cementing in of casing, the main problem encountered is how to provide a better cement bond between both the casing and the wellbore and the cement in the annulus to overcome the problem of water migration between various zones, sometimes termed microchannelling.
There are many methods used such as, for example, cement squeezes, setting packers to isolate zones, and using turbolizers. These methods are all quite expensive and complex and not always effective.
It is common practice to rotate casing in shallow holes (to approx. 1000m).
This has been found to noticeably enhance the bond between the casing and the cement thereby decreasing the chance of microchannelling along the casing string.
Rotating has been found to be effective at shallower depths. However, it is not feasible to rotate the casing from surface in deeper holes or in bridged-off portions of the hole.
SUMMARY OF THE INVENTION
An assembly and method has been invented to provide for rotation of a casing section in a zone of interest without requiring rotation of the casing string from surface. Such rotation enhances cementing procedures. The assembly is particularly useful as it permits rotation in zones of interest in which previously casing rotation was difficult such as, for example, in deep sections of the borehole.
The assembly is also useful for rotating through bridged-off portions of the hole.
Thus in accordance with a broad aspect of the present invention, there is provided:
an assembly for connection to a casing string comprising: a casing section connected to the casing string through a bearing device, the bearing device S:1C4\47214443010002-1-app.doc permitting rotation of the casing section relative to the casing string and a means for rotating the casing section relative to the casing string.
The means for rotating the casing section can be a plurality of fins formed on the casing section and positioned to cause rotation of the casing section by action of fluids moving therepast. The fins are preferably formed on the inner surface of the casing section. To provide for removal of the fins should it be desirable to have access therebelow, the fins can be formed of easily drillable material such as aluminum or fiberglass.
In accordance with a further aspect of the present invention, there is provided a method for cementing in a casing section at a zone of interest, comprising:
providing a casing string with a casing section attached thereto and extending across a zone of interest, the casing section and the casing string each having inner bores and the inner bore of the casing section being in communication with the inner bore of the casing string; and pumping cement through the inner bores of the casing string and the casing section while rotating the casing section at an increased rate of rotation than that of the casing string.
In accordance with another aspect of the present invention, there is provided a method for rotating a section of casing a rate different from any rate of rotation of the casing string to which the section of casing is attached; comprising:
providing a casing string and a casing section connected to the casing string through a bearing device, the bearing device permitting rotation of the casing section relative to the casing string and a means for rotating the casing section relative to the casing string;
and actuating the means for rotating to drive the casing section to rotate on the bearing device relative to the casing string.
BRIEF DESCRIPTION OF THE DRAWINGS
A further, detailed, description of the invention, briefly described above, will follow by reference to the following drawings illustrating one embodiment of the invention.
These drawings depict only a typical embodiment of the invention and are therefore not to be considered limiting of its scope. In the drawings:
Figure 1 is a section along a casing string including an assembly according to the present invention.
S:\C4',472\44430\0002-1-app.doc DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The rotating casing assembly according to the present invention allows for rotation of the casing at any depth. Only a selected portion of the casing will be rotated and rotation from surface is not required. The selected portion that is rotated is usually the portion crossing the production zone. This method is extremely economical compared to other methods and requires no additional rig time or surface equipment.
The casing is driven to rotate by the fluid being pumped through it.
In one embodiment as shown in Figure 1, the assembly includes a rotating bearing pack "A" and a section of casing "B" specially made with a series of internal fins.
The rotating bearing pack must be able to carry the weight of the casing below it, be sealed to prevent contamination by well and completion fluids and also to withstand the burst pressure of the casing. The bearing pack can be for example a race of ball bearings sealed within a housing. The bearing pack can be connected in any desirable way such as, for example, by welding or threaded connection between the end of a standard casing string and the section of casing B.
Below the bearing pack is a piece of casing with an internal array of fins that will rotate the casing when fluid is pumped through. The internal fins are shaped andlor positioned to drive the casing to turn freely on the bearing when fluid is pumped past the fins of the casing. To provide drive, the fins can have standard turbine structure and positioning, as would be appreciated.
Preferably the fins are positioned to drive rotation to the left. Left-hand rotation is preferred since should the bearing pack fail the casing string would not come apart.
In a preferred embodiment, the fins are formed of a drillable material such as, for example, aluminum or fiberglass to facilitate removal from the casing string.
It will be apparent that may other changes may be made to the illustrative embodiments, while falling within the scope of the invention and it is intended that all such changes be covered by the claims appended hereto.
S:1C4\472\44430\0002-l-app.doc
Claims (8)
1. An assembly for connection to a casing string comprising:
a casing section connected to the casing string through a bearing device, the bearing device permitting rotation of the casing section relative to the casing string and a means for rotating the casing section relative to the casing string.
a casing section connected to the casing string through a bearing device, the bearing device permitting rotation of the casing section relative to the casing string and a means for rotating the casing section relative to the casing string.
2. The assembly as in claim 1 wherein the means for rotating the casing section is a plurality of fins formed on the casing section and positioned to cause rotation of the casing section by action of fluids moving therepast.
3. The assembly as in claim 2 wherein the casing section has an inner surface and an outer surface and the fins are formed on the inner surface of the casing section.
4. The assembly as in claim 3 wherein the fins are formed of easily drillable material.
5. A method for cementing in a casing section at a zone of interest, comprising:
providing a casing string with a casing section attached thereto and extending across a zone of interest, the casing section and the casing string each having inner bores and the inner bore of the casing section being in communication with the inner bore of the casing string; and pumping cement through the inner bores of the casing string and the casing section while rotating the casing section at an increased rate of rotation than that of the casing string.
providing a casing string with a casing section attached thereto and extending across a zone of interest, the casing section and the casing string each having inner bores and the inner bore of the casing section being in communication with the inner bore of the casing string; and pumping cement through the inner bores of the casing string and the casing section while rotating the casing section at an increased rate of rotation than that of the casing string.
6 6. A method for rotating a section of casing at a rate different from any rate of rotation of the casing string to which the section of casing is attached;
comprising:
providing a casing string and a casing section connected to the casing string through a bearing device, the bearing device permitting rotation of the casing section relative to the casing string and a means for rotating the casing section relative to the casing string; and actuating the means for rotating to drive the casing section to rotate on the bearing device relative to the casing string.
comprising:
providing a casing string and a casing section connected to the casing string through a bearing device, the bearing device permitting rotation of the casing section relative to the casing string and a means for rotating the casing section relative to the casing string; and actuating the means for rotating to drive the casing section to rotate on the bearing device relative to the casing string.
7. The method of claim 6 used to rotate through a bridged off portion of the hole.
8. The method of claim 6 used to create turbulence in cement passing through a casing annulus during a completion operation.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2291301 CA2291301A1 (en) | 1999-11-30 | 1999-11-30 | Rotating casing assembly |
| CA 2326995 CA2326995C (en) | 1999-11-30 | 2000-11-28 | Rotating casing assembly and method |
| US09/725,163 US6446725B2 (en) | 1999-11-30 | 2000-11-29 | Rotating casing assembly and method |
| GB0111797A GB2375555A (en) | 1999-11-30 | 2001-05-15 | Rotating casing assembly and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2291301 CA2291301A1 (en) | 1999-11-30 | 1999-11-30 | Rotating casing assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2291301A1 true CA2291301A1 (en) | 2001-05-30 |
Family
ID=4164751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2291301 Abandoned CA2291301A1 (en) | 1999-11-30 | 1999-11-30 | Rotating casing assembly |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2291301A1 (en) |
-
1999
- 1999-11-30 CA CA 2291301 patent/CA2291301A1/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |