CA1154380A - Casing stand-off band for use with running cementing of casing in wellbores - Google Patents
Casing stand-off band for use with running cementing of casing in wellboresInfo
- Publication number
- CA1154380A CA1154380A CA000411063A CA411063A CA1154380A CA 1154380 A CA1154380 A CA 1154380A CA 000411063 A CA000411063 A CA 000411063A CA 411063 A CA411063 A CA 411063A CA 1154380 A CA1154380 A CA 1154380A
- Authority
- CA
- Canada
- Prior art keywords
- casing
- band
- well bore
- flutes
- cementing
- 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.)
- Expired
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1078—Stabilisers or centralisers for casing, tubing or drill pipes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B17/22—Rods or pipes with helical structure
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
CASING STAND-OFF BAND FOR USE WITH RUNNING
AND CEMENTING OF CASING IN WELLBORES
Abstract - Stand-off band of this invention is particularly useful when mounted on casing which must be run into deviated wellbores to assure that the casing does not stick prior to reaching a desired depth and permits the casing to be reciprocated up and down, or rotated, during the cementing operation, in order to obtain more effective cementing of the casing. The design and construction of this invention with its spiralled flutes cause the stand-off band to rotate relative to the wellbore and the casing and thus distribute the wear over the entire circumference of the stand-off band and during cementing the spiralled flutes guide the cement in a spiralled fashion for more effective displacement of the drilling mud from the annulus.
AND CEMENTING OF CASING IN WELLBORES
Abstract - Stand-off band of this invention is particularly useful when mounted on casing which must be run into deviated wellbores to assure that the casing does not stick prior to reaching a desired depth and permits the casing to be reciprocated up and down, or rotated, during the cementing operation, in order to obtain more effective cementing of the casing. The design and construction of this invention with its spiralled flutes cause the stand-off band to rotate relative to the wellbore and the casing and thus distribute the wear over the entire circumference of the stand-off band and during cementing the spiralled flutes guide the cement in a spiralled fashion for more effective displacement of the drilling mud from the annulus.
Description
3~3~
1 This invention relates to a well-casing centering device which is placed over the casing and facilitates the running of the casing and cementing the casing to the well bore.
In drilling well bores such as oilwells, it is common practice to drill through the various formations to a point closely adjacent to or into the productive zone, and then to case the well.
During such drilling, there is normally some deviation from the vertical due to the interaction of the drilling equipment and the drilling practices and between the foregoing and variations in the formation, and this is normally referred to as a crooked well. During such drilling, it is sometimes desirable to deviate the well bore at an angle and usually in a specific direction. Such deviations can take many forms including wells which are started at an incline at the surface either to reach a specific area of the formation or to permit the well bore to traverse a greater length in the formation to aid in improved production.
Figure 1 is a prospective view of the casing stand off band;
Figure 2 is a schematlc sectlonal view of a portion of a deviated well bore showing a casing suspended therein on which is mounted a stand off band shown in prospective view in Figure 1.
Under some conditions, it is necessary to bypass or drill around tùe inltially intended well bore because of mechanical problems. It is common that the casing particularly under such deviated conditions will not center properly but bears with considerable force against the side of the well bore.
After the casing has been positloned to the desired depth it is cemented in by forcing cementatious material from the bottom of the casing upwardly around the casing to displace the drilling mud that is forced into the well to carry away the cuttings and it is important to obtain cement around the casing to fill the space between the casing .~
, ~5~38~
1 and the well bore.
During the running of the well casing 9 it sometimes becomes stuck in the well bore due to the differential pressure. It is also common practice to rotate the casing in the well bore during the cementing and to reciprocate the casing up and down during the pumping of the cement slurry to ensure complete evacuation of drilling mud from the well bore and to prevent channeling of the cement slurry which would result in an incomplete and inferior cementing.
It is of increased importance to achieve as complete cementing as possible in wells which are subjected to steam injection either continuously or cyclicly to stimulate the formation to enhance formation fluid recovery. Such heating and cooling results in thermalexpansion and contraction of the casing and if adequate cementing has not accomplished can result in breaking of the bond between the cement and the casing allowing it to move and can even allow leakage oE the steam or formation fluids and to escape to the ;~ surface or to escape into other formations which is undesirable.
~here have heretofore been developed and used a number of ~` 20 devices to be attached to the casing to alleviate some of the ` aforesaid problems.
It is the object of the present invention to overcome the limitations of the prior practices and of the devices that have heretofore been utilized to attempt to overcome these problems. The invention disclosed and claimed in United States Patent Serial ~umber 1,767,198 - Rueben C. Baker discloses a centering device which incorporates vanes arranged spirally with respect to the longitudinal axis of the device, so that when the centering device is arranged in a well casing, the vanes will engage the casing thereof, holding the circular member concentrically with respect to the casing and forming ~S~3~
1 a plurality of spirally disposed passage ways between the circular member and the casing. To assist the cement slurry material passing along the well bore to completely envelope the casing and ~o minimize the channelling of the cement in the drilling mud that must be displaced. This device is designed to be fastened fixedly to the casing and thus would tend to inhibit the ability of the casing to be reciprocated up and down in the well bore and also inhibit the ability to rotate the casing to aid in the cementing.
Canadian Patent 1,032,867 by Alexander is free to move along :-the axis of the casing between the couplings or collars to aid in the reciprocation of the casing and the rotating the casing while cementing. It is also claimed for that invention that the particular configuration has more resistance to collapse from lateral Eorces encountered within the well bore than previous devices.
One of the disadvantages of this and previous devices ; particularly in deliberately deviated wells, that the centering devices will tend to stay in one position with respect to the well bore and such devices can thus wear on that position and thus permit the casing to come in close contact with the well bore increasing the possibility of differential sticking and could cause a jamming between the casing and ~; the well bore should they wear out and become dislodged.
Accordingly 9 my invention comprises of a casing stand off b~nd (50) for mounting on a string of casing (13) which is to be run into and cemented in a well bore (11) and reciprocated or rotated during the cementing operation and wherein the casing has a plurality of lengths of plpe connected by couplings (14) having outside diameters larger than the pipe. (13) The centralizer is adapted for mounting about one of the lengths of pipe (13) intermediate between the couplings (14) connected thereto.
The band has an internal diameter larger than the outside ~S43~3~
1 diameter of the lengths of pipe about which the band is mounted and smaller than the outside diameter of the couplings. The outer surEace of the centralizing device is fluted outwardly so that the outside diameter of the flutes (51) is larger than the couplings of the casing but smaller than the inside diameter of the well bore (11). The flutes are arranged at an angle to the axis of the casing to form spiral thus when the casing string is being lowered or raised the interaction between the spiral flutes (51) and the sides of the well bore (11) will cause the device to rotate spirally and ; 10thus permit the wear on the spiral flutes and the device to be distributed uniformally over the device and such spiralling action would tend to minimize the tendency for differential sticking of the casing string to occur.
The spiral flutes being arranged at an angle to the axis of the casing to form spiral passage ways (53) between the casing and the member to assist the cement slurry passing along the well bore to travel spirally in the annulus (12~ between the casing and the well bore and thus aid in a more complete displacement of the drilling mud ~ ,:
~`and thus to minimize the channelling which has a tendency to occur without such spiral devices.
; ~dditionally, spiral configuration provides a device with greater resistance to collapse than the flutes disclosed in Canadian Patent 1,032,867 which are parallel to the axis of the casing pipe.
These devices are typically formed into a circular band then joined together for placement over the casing pipes between the couplings which fasten such lengths thereto. The flutes (51~ are tapered and shaped to provide the appropriate stream lining action to rotate around the casing during a lowering of the casing into the well bore and to provide the most advantageous spiral path to direct the cement slurry in a spiral fashion around the casing.
1 There is provided by this invention, a casing centralizer band which provides positive standoff of the casing from the well bore and whose spiral flutes cause it to rotate during the insertion of the casing into the well bore and thus distribute the wear on the centralizer and to provide greater strength to resist collapse and deformation due to lateral forces and to provide freedom of movement both up and down and rotatibly of the casing inside the devices and to provide spiral guidance to the cement slurry to encourage a more complete and uniform displacement of the drilling mud and more complete bonding of the cement to the casing and to the well bore.
There will be less tendency to damage the well bore or otherwise dig into the well bore and to be damaged by the well bore as in the case of prior art centralizers.
.~ .
1 This invention relates to a well-casing centering device which is placed over the casing and facilitates the running of the casing and cementing the casing to the well bore.
In drilling well bores such as oilwells, it is common practice to drill through the various formations to a point closely adjacent to or into the productive zone, and then to case the well.
During such drilling, there is normally some deviation from the vertical due to the interaction of the drilling equipment and the drilling practices and between the foregoing and variations in the formation, and this is normally referred to as a crooked well. During such drilling, it is sometimes desirable to deviate the well bore at an angle and usually in a specific direction. Such deviations can take many forms including wells which are started at an incline at the surface either to reach a specific area of the formation or to permit the well bore to traverse a greater length in the formation to aid in improved production.
Figure 1 is a prospective view of the casing stand off band;
Figure 2 is a schematlc sectlonal view of a portion of a deviated well bore showing a casing suspended therein on which is mounted a stand off band shown in prospective view in Figure 1.
Under some conditions, it is necessary to bypass or drill around tùe inltially intended well bore because of mechanical problems. It is common that the casing particularly under such deviated conditions will not center properly but bears with considerable force against the side of the well bore.
After the casing has been positloned to the desired depth it is cemented in by forcing cementatious material from the bottom of the casing upwardly around the casing to displace the drilling mud that is forced into the well to carry away the cuttings and it is important to obtain cement around the casing to fill the space between the casing .~
, ~5~38~
1 and the well bore.
During the running of the well casing 9 it sometimes becomes stuck in the well bore due to the differential pressure. It is also common practice to rotate the casing in the well bore during the cementing and to reciprocate the casing up and down during the pumping of the cement slurry to ensure complete evacuation of drilling mud from the well bore and to prevent channeling of the cement slurry which would result in an incomplete and inferior cementing.
It is of increased importance to achieve as complete cementing as possible in wells which are subjected to steam injection either continuously or cyclicly to stimulate the formation to enhance formation fluid recovery. Such heating and cooling results in thermalexpansion and contraction of the casing and if adequate cementing has not accomplished can result in breaking of the bond between the cement and the casing allowing it to move and can even allow leakage oE the steam or formation fluids and to escape to the ;~ surface or to escape into other formations which is undesirable.
~here have heretofore been developed and used a number of ~` 20 devices to be attached to the casing to alleviate some of the ` aforesaid problems.
It is the object of the present invention to overcome the limitations of the prior practices and of the devices that have heretofore been utilized to attempt to overcome these problems. The invention disclosed and claimed in United States Patent Serial ~umber 1,767,198 - Rueben C. Baker discloses a centering device which incorporates vanes arranged spirally with respect to the longitudinal axis of the device, so that when the centering device is arranged in a well casing, the vanes will engage the casing thereof, holding the circular member concentrically with respect to the casing and forming ~S~3~
1 a plurality of spirally disposed passage ways between the circular member and the casing. To assist the cement slurry material passing along the well bore to completely envelope the casing and ~o minimize the channelling of the cement in the drilling mud that must be displaced. This device is designed to be fastened fixedly to the casing and thus would tend to inhibit the ability of the casing to be reciprocated up and down in the well bore and also inhibit the ability to rotate the casing to aid in the cementing.
Canadian Patent 1,032,867 by Alexander is free to move along :-the axis of the casing between the couplings or collars to aid in the reciprocation of the casing and the rotating the casing while cementing. It is also claimed for that invention that the particular configuration has more resistance to collapse from lateral Eorces encountered within the well bore than previous devices.
One of the disadvantages of this and previous devices ; particularly in deliberately deviated wells, that the centering devices will tend to stay in one position with respect to the well bore and such devices can thus wear on that position and thus permit the casing to come in close contact with the well bore increasing the possibility of differential sticking and could cause a jamming between the casing and ~; the well bore should they wear out and become dislodged.
Accordingly 9 my invention comprises of a casing stand off b~nd (50) for mounting on a string of casing (13) which is to be run into and cemented in a well bore (11) and reciprocated or rotated during the cementing operation and wherein the casing has a plurality of lengths of plpe connected by couplings (14) having outside diameters larger than the pipe. (13) The centralizer is adapted for mounting about one of the lengths of pipe (13) intermediate between the couplings (14) connected thereto.
The band has an internal diameter larger than the outside ~S43~3~
1 diameter of the lengths of pipe about which the band is mounted and smaller than the outside diameter of the couplings. The outer surEace of the centralizing device is fluted outwardly so that the outside diameter of the flutes (51) is larger than the couplings of the casing but smaller than the inside diameter of the well bore (11). The flutes are arranged at an angle to the axis of the casing to form spiral thus when the casing string is being lowered or raised the interaction between the spiral flutes (51) and the sides of the well bore (11) will cause the device to rotate spirally and ; 10thus permit the wear on the spiral flutes and the device to be distributed uniformally over the device and such spiralling action would tend to minimize the tendency for differential sticking of the casing string to occur.
The spiral flutes being arranged at an angle to the axis of the casing to form spiral passage ways (53) between the casing and the member to assist the cement slurry passing along the well bore to travel spirally in the annulus (12~ between the casing and the well bore and thus aid in a more complete displacement of the drilling mud ~ ,:
~`and thus to minimize the channelling which has a tendency to occur without such spiral devices.
; ~dditionally, spiral configuration provides a device with greater resistance to collapse than the flutes disclosed in Canadian Patent 1,032,867 which are parallel to the axis of the casing pipe.
These devices are typically formed into a circular band then joined together for placement over the casing pipes between the couplings which fasten such lengths thereto. The flutes (51~ are tapered and shaped to provide the appropriate stream lining action to rotate around the casing during a lowering of the casing into the well bore and to provide the most advantageous spiral path to direct the cement slurry in a spiral fashion around the casing.
1 There is provided by this invention, a casing centralizer band which provides positive standoff of the casing from the well bore and whose spiral flutes cause it to rotate during the insertion of the casing into the well bore and thus distribute the wear on the centralizer and to provide greater strength to resist collapse and deformation due to lateral forces and to provide freedom of movement both up and down and rotatibly of the casing inside the devices and to provide spiral guidance to the cement slurry to encourage a more complete and uniform displacement of the drilling mud and more complete bonding of the cement to the casing and to the well bore.
There will be less tendency to damage the well bore or otherwise dig into the well bore and to be damaged by the well bore as in the case of prior art centralizers.
.~ .
Claims
Claim The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
(1) A casing stand-off band for mounting on a string of casing which is to be run into and cemented in a well bore and reciprocated or rotated during the cementing operation and wherein said casing has a plurality of lengths of pipe connected by couplings having outside diameters larger than said pipe, said band being adapted for mounting about one of said lengths of pipe at a point intermediate between said couplings connected thereto, and having an internal diameter larger than the outside diameter of the said length of pipe by which said band is mounted and smaller than the outside diameter of said couplings, being further characterized by having a series of circumferentially spaced flutes of streamline configuration forming a substantial part of the outer surface of said band and projecting therefrom, to define axially extending lands and grooves thereon, the flutes arranged at an angle to the axis of the casing to form a spiral, the outer most surfaces of said lands providing said band with a projected outside diameter smaller than the well bore in which the casing is to be placed and greater than the outside diameter of said coupling whereby said band provides resistance to collapse from lateral forces and effectively prevent casing sticking during running and during the cementing operation when the casing is moved in the well bore and the spiraled flutes cause the band to rotate with respect to the well bore and casing during lowering or raising to evenly distribute wear and such flutes providing spiral passage which causes the cement slurry to spiral along the pipe to prevent channelling.
(1) A casing stand-off band for mounting on a string of casing which is to be run into and cemented in a well bore and reciprocated or rotated during the cementing operation and wherein said casing has a plurality of lengths of pipe connected by couplings having outside diameters larger than said pipe, said band being adapted for mounting about one of said lengths of pipe at a point intermediate between said couplings connected thereto, and having an internal diameter larger than the outside diameter of the said length of pipe by which said band is mounted and smaller than the outside diameter of said couplings, being further characterized by having a series of circumferentially spaced flutes of streamline configuration forming a substantial part of the outer surface of said band and projecting therefrom, to define axially extending lands and grooves thereon, the flutes arranged at an angle to the axis of the casing to form a spiral, the outer most surfaces of said lands providing said band with a projected outside diameter smaller than the well bore in which the casing is to be placed and greater than the outside diameter of said coupling whereby said band provides resistance to collapse from lateral forces and effectively prevent casing sticking during running and during the cementing operation when the casing is moved in the well bore and the spiraled flutes cause the band to rotate with respect to the well bore and casing during lowering or raising to evenly distribute wear and such flutes providing spiral passage which causes the cement slurry to spiral along the pipe to prevent channelling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000411063A CA1154380A (en) | 1982-09-09 | 1982-09-09 | Casing stand-off band for use with running cementing of casing in wellbores |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000411063A CA1154380A (en) | 1982-09-09 | 1982-09-09 | Casing stand-off band for use with running cementing of casing in wellbores |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1154380A true CA1154380A (en) | 1983-09-27 |
Family
ID=4123551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000411063A Expired CA1154380A (en) | 1982-09-09 | 1982-09-09 | Casing stand-off band for use with running cementing of casing in wellbores |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1154380A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0671546A1 (en) * | 1994-03-12 | 1995-09-13 | Downhole Products (UK) Limited | Casing centraliser |
| US6006830A (en) * | 1994-03-12 | 1999-12-28 | Downhole Products (Uk) Limited | Casing centraliser |
| USD849800S1 (en) | 2012-04-04 | 2019-05-28 | Summit Energy Services, Inc. | Casing centralizer having spiral blades |
-
1982
- 1982-09-09 CA CA000411063A patent/CA1154380A/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0671546A1 (en) * | 1994-03-12 | 1995-09-13 | Downhole Products (UK) Limited | Casing centraliser |
| EP0816628A1 (en) * | 1994-03-12 | 1998-01-07 | Downhole Products PLC | Casing centraliser |
| US5797455A (en) * | 1994-03-12 | 1998-08-25 | Downhole Products (Uk) Limited | Casing centraliser |
| US6006830A (en) * | 1994-03-12 | 1999-12-28 | Downhole Products (Uk) Limited | Casing centraliser |
| USD849800S1 (en) | 2012-04-04 | 2019-05-28 | Summit Energy Services, Inc. | Casing centralizer having spiral blades |
| USD983231S1 (en) | 2012-04-04 | 2023-04-11 | Summit Casing Services, Llc | Casing centralizer having spiral blades |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |