CN107965275A - Centralizer - Google Patents
Centralizer Download PDFInfo
- Publication number
- CN107965275A CN107965275A CN201610911042.XA CN201610911042A CN107965275A CN 107965275 A CN107965275 A CN 107965275A CN 201610911042 A CN201610911042 A CN 201610911042A CN 107965275 A CN107965275 A CN 107965275A
- Authority
- CN
- China
- Prior art keywords
- centralizer
- cylinder
- spacing ring
- rib
- casing
- 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.)
- Pending
Links
- 238000005553 drilling Methods 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 5
- 239000012530 fluid Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 210000002421 cell wall Anatomy 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 206010016825 Flushing Diseases 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 239000010959 steel 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
- 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
-
- 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
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1078—Stabilisers or centralisers for casing, tubing or drill pipes
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
The present invention relates to a kind of centralizer, it includes cylinder and righting rib, and the righting rib is arranged at the outside of the cylinder, and the righting rib is rotatably connected with the cylinder.It can ensure that tail pipe or sleeve rotating well cementing operation can be smoothed out using this centralizer.
Description
Technical field
The present invention relates to cementing technology field, more particularly to a kind of centralizer.
Background technology
Centralizer is mainly used for avoiding casing or tail pipe from contacting the borehole wall, improves drilling fluid, improves cementing quality.
With the development of cementing technology, rotary tail or revolving casing cementing technology are pushed away because can improve cementing quality
Wide application.However, centralizer of the prior art is totally unfavorable for protection rotary tail or revoling tube.This is
Because centralizer needs to be in contact with the borehole wall while with tail pipe or sleeve rotating, this is easy to cause centralizer and is subject to larger damage
Wound, and centralizer is possible to be stuck on the borehole wall and thus causes tail pipe or casing is difficult to continue to rotate.This causes rotary sleeve
Pipe or tail pipe operation cannot smoothly be implemented, and reduce cementing quality.
Therefore, it is necessary to a kind of centralizer that can ensure that tail pipe or sleeve rotating well cementing operation can be smoothed out.
The content of the invention
In view of the above-mentioned problems, the present invention proposes a kind of centralizer, it can ensure that tail pipe or casing revolve using this centralizer
Turning well cementing operation can be smoothed out.
According to the invention it is proposed that a kind of centralizer, including cylinder, and righting rib, the righting rib are arranged at described
The outside of cylinder, and the righting rib is rotatably connected with the cylinder.
In centralizer with tail pipe or casing lower going-into-well and when tail pipe or sleeve rotating, the cylinder of centralizer can be with
Tail pipe or casing rotates together, and righting rib is rotatably connected with cylinder, therefore can not be with rotary tail or revoling tube one
Rise and rotate.Righting rib can not be rotated relative to the borehole wall, or only produce small rotation.Thus, righting rib and well can be reduced
Friction between wall, avoids centralizer from being damaged.In addition, this be also avoided that because righting rib is stuck on the borehole wall hinder rotary tail or
Revoling tube continues to rotate.Therefore, this centralizer is passed through, it can be ensured that underground work is smoothed out.
In one embodiment, righting rib is extendable in the longitudinal direction, and two ends and the cylinder of the righting rib revolve
Rotatable connection, the pars intermedia of the righting rib are projected radially outward relative to the cylinder.
In one embodiment, the end structure of righting rib is into the groove with the opening towards the cylinder, in the groove
Interior receiving helps rotation thing.
In one embodiment, ball is in contact with the inner wall of the cylinder and the groove.
In one embodiment, be provided with the groove one of multiple balls, multiple balls and and its
Two adjacent balls are in contact.
In one embodiment, pars intermedia is configured with the sheet bar body of elasticity.
In one embodiment, the end structure of centralizer into can move along the longitudinal direction relative to the cylinder.
In one embodiment, the first spacing ring projected radially outward is also configured with the outside of the cylinder, it is described
First spacing ring be located in one of end away from the side of the other end.
In one embodiment, the second spacing ring projected radially outward is also configured with the outside of the cylinder, it is described
Second spacing ring is between two ends.
In one embodiment, the distance between the first spacing ring and second spacing ring are more than positioned at the described first limit
The longitudinal length of end between position ring and second spacing ring.
Compared with prior art, the advantage of the invention is that：Centralizer with tail pipe or casing lower going-into-well and
When tail pipe or sleeve rotating, the cylinder of centralizer can rotate together with tail pipe or casing, and righting rib rotatably connects with cylinder
Connect, therefore can not be rotated with rotary tail or revoling tube.Righting rib can not be rotated relative to the borehole wall, or only be produced
Small rotation.Thus, the friction between righting rib and the borehole wall can be reduced, avoid centralizer from being damaged.In addition, this be also avoided that because
Righting rib is stuck on the borehole wall and hinders rotary tail or revoling tube to continue to rotate.Therefore, this centralizer is passed through, it can be ensured that
Underground work is smoothed out.
Brief description of the drawings
The invention will be described in more detail below based on embodiments and refering to the accompanying drawings.Wherein：
Fig. 1 is the structure diagram of one embodiment of centralizer according to the present invention.
In the accompanying drawings, identical component uses identical reference numeral.Attached drawing is not according to actual ratio.
Embodiment
The present invention will be further described with reference to the accompanying drawings.
Fig. 1 schematically shows one embodiment of centralizer 100 according to the present invention.
As shown in Figure 1, centralizer 100 includes generally cylindrical cylinder 110, and it is arranged on the outside of cylinder 110
Righting rib.Righting rib is extendable in the longitudinal direction, and including two ends 120A, 120B with 110 rotary type contact of cylinder, with
And the pars intermedia 121 being connected between two ends 120A, 120B and with two ends 120A, 120B, pars intermedia 121 are opposite
Projected radially outward in cylinder 110, such as can be into arch or bowed shape shown in Fig. 1.The cylinder of this centralizer 100
110 for example can be with turnbarrel or rotary tail by screwed connection, and as turnbarrel or rotary tail rotate together.
And due to rotatably being connected between righting rib and cylinder 110, so when cylinder 110 rotates, righting rib need not revolve together therewith
Turn, or the speed rotated with is relatively slow, amplitude is smaller.Thus, will not be relative to the borehole wall when righting rib is contacted with the borehole wall
Significantly rotate, because without causing to produce very big friction between righting rib and the borehole wall because of rotation, or will not be because of rotation
Then cause righting rib to be stuck on the borehole wall, and thus without the rotation for hindering cylinder 110 and revoling tube or rotary tail.Cause
This, above-mentioned centralizer 100 can effectively ensure that centralizer 100 and using its casing or tail pipe stable structure, reduce
The rotation torque of casing or tail pipe, and thus can ensure that being smoothed out for underground work.
As shown in Figure 1, end 120A, 120B of righting rib can be configured to the groove with the opening towards cylinder 110,
It can be accommodated in the groove and help rotation thing.It can be slide, lubricator etc. to help rotation thing.Preferably, it is ball 122 to help rotation thing.Ball
122 are in contact with the outer surface of cell wall and cylinder 110.When cylinder 110 is rotated relative to righting rib, ball 122 is relative to cylinder
Body 110 and cell wall roll, and thus reduces frictional force when cylinder 110 is rotated relative to righting rib between the two.Especially, groove
Can be annular groove, and multiple balls 122 are full of whole annular groove with can contacting with each other.So, it can ensure that ball
Friction between 122 and cell wall and cylinder 110 is generally rolling friction, thus, it is possible to which friction is reduced to very small journey
Degree.
In addition, the pars intermedia of righting rib can be sheet bar body as shown in Figure 1, and by with certain elasticity and having
The material (for example, steel) for having some strength is made.This righting rib can be while righting effect be ensured with longer use
Service life.
Preferably, end 120A can be slided along cylinder 110 in a longitudinal direction.It is highly preferred that in the upper of end 120A
Side, be provided with the first spacing ring 111A backwards to the side of end 120B, to limit the moving range of end 120A, to avoid helping
The pars intermedia 121 of positive rib is damaged because deforming excessive, and is also avoided that pars intermedia 121 is deformed into excessively flat and is difficult to play
Expected centralizing function.In the case where end 120A can be slided, end 120B can keep fixed.However, it is preferred that end
Portion 120B can also be slided along cylinder 110 in a longitudinal direction.Alternatively, it is also possible in the volume two of end 120B, i.e. backwards to end
The side of 120A sets the first spacing ring 111B.The effect of first spacing ring 111B is similar with the effect of the first spacing ring 111A,
It is used for the moving range for limiting end 120B.
In addition, it is to be understood that it is moveable that can also make end 120B, and end 120A is fixed.
As shown in Figure 1, in the case of end 120A and/or end 120B are transportable, can also in end 120A and
Second spacing ring 112 is set between the 120B of end.Second spacing ring 112 be avoided that end 120A and end 120B too close to,
And pars intermedia 121 is thus avoided to be damaged because deforming excessive.
It should be noted that in order to ensure end 120A, 120B have enough displacement distances, it should be ensured that spacing ring 111A,
111B and the distance between the second spacing ring 112 are sufficiently large.
The above-mentioned righting rib that can be deformed is favourable for through bad hole and slim-hole, even if being squeezed
Pressure is not easy to damage.Especially, above-mentioned centralizer can reduce the moment of torsion that casing screw thread is subject to, and can prevent casing from turning round, to tail
Pipe and casing have beneficial protective effect.
In order to further show the advantage of the centralizer 100 of the present invention, hereinafter by centralizer 100 and in the prior art
The application of centralizer be compared.
Embodiment 1
In S1 wells, tested using centralizer 100.In the S1 wells, using oil-base mud drilling well, oil base drilling fluid
Friction coefficient 0.32, density 1.38g/cm3.89.6 ° of hole angle during finishing drilling, horizontal segment length 1600m, oblique depth 4490.0m, vertical depth are
2761.0m, kickoff point (KOP) 2120m, bit size 215.9mm, sleeve outer 139.7mm, wall thickness 12.34mm.Full well uses 191
Every casing of centralizer 100, wherein horizontal segment and High angle section places a centralizer 100, and straight well section 3-4 roots casing places one
Centralizer 100.In order to ensure the normally casing into of casing, when casing is down toward shaft bottom 3020m, revoling tube, rotation torque is
2600Nm, when casing tripping in is to shaft bottom 4490m, sleeve rotating moment of torsion is 7609Nm, ensure that the normally casing into of casing, under
Enter process without being hampered or meet card phenomenon.
Comparative example 1
In the S1 ' well similar with S1 wells, tested using existing centralizer.In the S1 ' wells, using oil base mud
Starch drilling well, oil base drilling fluid friction coefficient 0.31, density 1.37g/cm3.88.5 ° of hole angle during finishing drilling, horizontal segment length 1512m,
Oblique depth 4446.0m, vertical depth 2776.0m, kickoff point (KOP) 2229m, bit size 215.9mm, sleeve outer 139.7mm, wall thickness
12.34mm.Full well uses ordinary resin rigid centralizer 185, and wherein every casing of horizontal segment and High angle section places one
Centralizer, straight well section 3-4 roots casing place a centralizer.In order to ensure the normally casing into of casing, in casing down toward shaft bottom
During 3051m, revoling tube, rotation torque 3371Nm, when casing tripping in is to shaft bottom 4446m, sleeve rotating moment of torsion reaches
10900Nm, casing maximum admissible torque are 12000Nm, for protection sleeve pipe screw thread, during down toward shaft bottom, fail to realize rotation
Turn.
Embodiment 2
In S2 wells, tested using centralizer 100.The well type of S2 wells is straight well, finishing drilling well depth 3500m, and finishing drilling is bored
Area of bed 215.9mm, sleeve outer 139.7mm, casing wall thickness 9.17mm, drilling fluid density 1.28g/cm during finishing drilling3.Full well is adopted
With 88 centralizers 100,4 casings of straight well section place a centralizer 100.Revoling tube after casing tripping in, realizes rotary sleeve
Pipe is cemented the well.With 1.8m3In/min discharge capacity washing well process, revoling tube, rotation torque 2680Nm.In the mistake of cementing ring
Cheng Zhong, with 20 revs/min of revoling tubes, realizes revolving casing cementing, rotation torque 2790Nm.Carry out sound width survey after 7 days
Well, full well quality are high-quality.
Comparative example 2
In S2 wells, tested using existing centralizer.Full well uses plain cast iron rigid centralizer 81, straight well
4 casings of section place a centralizer.Revoling tube after casing tripping in, realizes revolving casing cementing.With 1.8m3/ min discharge capacities
In washing well process, revoling tube, rotation torque 3925Nm, with 20 revs/min of revoling tubes during cementing ring, is realized
Revolving casing cementing, rotation torque 4172Nm.Stereoplasm amount acoustic amplitude logging after 7 days, full well quality is good.
Embodiment 3
In S3 wells, tested using centralizer 100.The well type of S3 wells is straight well, finishing drilling well depth 5900m, and finishing drilling is bored
Area of bed 215.9mm, tail pipe pipe outside diameter 139.7mm, casing wall thickness 9.17mm, tail pipe length 908m, drilling fluid density during finishing drilling
1.48g/cm3.Full well uses 34 centralizers 100, and 3 casings of tailpipe section place a centralizer 100.Rotated after tail pipe tripping in
Casing, realizes revolving casing cementing.With 1.8m3During/min discharge capacity well-flushings, revoling tube, rotation torque is
5200N·m.During cementing ring, with 20 revs/min of revoling tubes, revolving casing cementing is realized, rotation torque is
5700N·m.Stereoplasm amount acoustic amplitude logging after 7 days, full well quality are high-quality.
Comparative example 3
In S3 wells, tested using existing centralizer.Full well uses resin rigidity centralizer 32, tailpipe section 3
Root casing places a centralizer.Revoling tube after tail pipe tripping in, realizes revolving casing cementing.With 1.8m3/ min discharge capacities are washed
During well, revoling tube, rotation torque 7800Nm.During cementing ring, with 20 revs/min of rotary sleeves
Pipe, when moment of torsion is 8200Nm, for protection sleeve pipe screw thread, abandons sleeve rotating.The acoustic amplitude logging of stereoplasm amount, Quan Jingzhi after 7 days
Amount is qualified.
By the way that embodiment 1 is carried out contrast with comparative example 1 as can be seen that can have using centralizer 100 in horizontal well
Effect reduces sleeve rotating moment of torsion and reaches more than 30.19%, and improves the success rate of sleeve rotating.By by embodiment 2 with contrast
Example 2 carries out contrast as can be seen that can ensure that casing normally casing into is same using centralizer 100 in the well cementation of straight well sleeve rotating
When, sleeve rotating moment of torsion 33.13% is effectively reduced, while improve cementing quality.By the way that embodiment 3 and comparative example 3 are carried out pair
Sleeve rotating moment of torsion can effectively be reduced up to more than 30.48% using centralizer 100 in rotary tail well cementation than can be seen that,
And ensure the smooth rotation of tail pipe.
Although by reference to preferred embodiment, invention has been described, is not departing from the situation of the scope of the present invention
Under, various improvement can be carried out to it and component therein can be replaced with equivalent.Especially, to be rushed as long as there is no structure
Prominent, items technical characteristic mentioned in the various embodiments can be combined in any way.The invention is not limited in text
Disclosed in specific embodiment, but all technical solutions including falling within the scope of the appended claims.
Claims (10)
1. a kind of centralizer, including cylinder and righting rib, the righting rib are arranged at the outside of the cylinder, and described help
Positive rib is rotatably connected with the cylinder.
2. centralizer according to claim 1, it is characterised in that the righting rib is extendable in the longitudinal direction, the righting
Two ends of rib are rotatably connected with the cylinder, and the pars intermedia of the righting rib is radially outward convex relative to the cylinder
Go out.
3. centralizer according to claim 2, it is characterised in that the end structure of the righting rib is into towards the cylinder
The groove of the opening of body, accommodates in the groove and helps rotation thing.
4. centralizer according to claim 3, it is characterised in that described to help rotation thing be ball, the ball and the cylinder
The inner wall of body and the groove is in contact.
5. centralizer according to claim 4, it is characterised in that multiple balls are provided with the groove, it is multiple
One of described ball and two balls adjacent thereto are in contact.
6. the centralizer according to any one of claim 2 to 5, it is characterised in that the pars intermedia is configured with bullet
The sheet bar body of property.
7. the centralizer according to any one of claim 2 to 6, it is characterised in that the end structure of the centralizer into
It can be moved along the longitudinal direction relative to the cylinder.
8. centralizer according to claim 7, it is characterised in that be also configured with the outside of the cylinder radially outward convex
The first spacing ring gone out, first spacing ring be located in one of end away from the side of the other end.
9. centralizer according to claim 8, it is characterised in that be also configured with the outside of the cylinder radially outward convex
The second spacing ring gone out, second spacing ring is between two ends.
10. centralizer according to claim 9, it is characterised in that first spacing ring and second spacing ring it
Between distance be more than the longitudinal length of end between first spacing ring and second spacing ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610911042.XA CN107965275A (en) | 2016-10-19 | 2016-10-19 | Centralizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610911042.XA CN107965275A (en) | 2016-10-19 | 2016-10-19 | Centralizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107965275A true CN107965275A (en) | 2018-04-27 |
Family
ID=61996326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610911042.XA Pending CN107965275A (en) | 2016-10-19 | 2016-10-19 | Centralizer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107965275A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2542367A1 (en) * | 1983-03-08 | 1984-09-14 | Petroles Cie Francaise | Centraliser for the casing of a drilling well |
| US5238062A (en) * | 1991-04-27 | 1993-08-24 | Weatherford/Lamb, Inc. | Centralizer for centring drilling and casing pipes and centralizing arrangement including said centralizer |
| US20050241822A1 (en) * | 2000-09-06 | 2005-11-03 | Casetech International, Inc. | Dual diameter and rotating centralizer/sub and method |
| GB2439234A (en) * | 2003-06-18 | 2007-12-19 | Weatherford Lamb | Centraliser actuated using downhole sensor to relay signal from surface |
| CN201159057Y (en) * | 2008-01-17 | 2008-12-03 | 张键 | Elastic centralizer |
| CN204386500U (en) * | 2014-12-21 | 2015-06-10 | 湖北领先石油科技股份有限公司 | A kind of radial variable casing tube centralizer |
-
2016
- 2016-10-19 CN CN201610911042.XA patent/CN107965275A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2542367A1 (en) * | 1983-03-08 | 1984-09-14 | Petroles Cie Francaise | Centraliser for the casing of a drilling well |
| US5238062A (en) * | 1991-04-27 | 1993-08-24 | Weatherford/Lamb, Inc. | Centralizer for centring drilling and casing pipes and centralizing arrangement including said centralizer |
| US20050241822A1 (en) * | 2000-09-06 | 2005-11-03 | Casetech International, Inc. | Dual diameter and rotating centralizer/sub and method |
| GB2439234A (en) * | 2003-06-18 | 2007-12-19 | Weatherford Lamb | Centraliser actuated using downhole sensor to relay signal from surface |
| CN201159057Y (en) * | 2008-01-17 | 2008-12-03 | 张键 | Elastic centralizer |
| CN204386500U (en) * | 2014-12-21 | 2015-06-10 | 湖北领先石油科技股份有限公司 | A kind of radial variable casing tube centralizer |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180427 |