CN102459803A

CN102459803A - Dual rotary centralizer for a borehole

Info

Publication number: CN102459803A
Application number: CN2010800245653A
Authority: CN
Inventors: 戴尔米亚·山塔努
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-06-08
Filing date: 2010-06-07
Publication date: 2012-05-16
Anticipated expiration: 2030-06-07
Also published as: EP2440739A2; US20120073803A1; WO2010143201A2; CN102459803B; EP2440739B1; WO2010143201A3

Abstract

The present invention relates to an apparatus for use in a wellbore, which comprises two rotating bodies (1, 11) and a ring (4). The said rotating bodies rotate clockwise or anticlockwise on its own axis. Preferably, the present invention provides a dual rotary centralizer with a unique dual rotating design with an advantage of an integral stop. This combination enables a free rotation on the axis of the casing pipe which allows easy casing rotation while the dual rotary centralizer stays in its position onto the casing pipe eliminating altogether the need for stop collars. The clockwise and anticlockwise rotation of two bodies induces extra swirl action.

Description

Double rotating boring centralizer

Technical field

The present invention is the double rotating boring centralizer that is applicable in the boring of recover petroleum or natural gas.More precisely, this invention is one and on ring, two rotary heads is housed, and can press dual body clockwise or the counter clockwise direction rotation around self axle center.

Background technology

The exploitation of hydrocarbons such as oil and natural gas is a very complicated process.The construction of traditional oil and natural gas well generally all is to utilize the end rotation of single rotary head at bull stick.Bull stick utilizes a plurality of sleeve pipes to remain on the vertical axis invariant position of boring firmly, and these sleeve pipes are fixed on the bull stick according to certain intervals in advance, common people's said " centralizer " just, and then by cemented between boring internal diameter and cover external diameter of pipe.The thick and heavy mud that drilling operation stays after finishing is exactly because the cause of these cement.Under the ideal situation, sleeve pipe can rotate or move back and forth longitudinally, around it, evenly distributes along the length of sleeve pipe to guarantee cement.

Centralizer normally is fixed on the tubing string along tubing string according to certain intervals, such as casing string, is to be used for the exterior wall of separation sleeve tubing string and the hole wall of the boring that casing string has been installed.This method is used for boring traditional peupendicular hole very much.When problem just appeared at rat holing, we need hole by certain angle at certain position of peupendicular hole.Specifically, with the change owing to the bull stick direction, huge side pressure has been transferred on the centralizer.And present underload centralizer probably can cause staying in the well fragment.

Secondly, remain on the wellhole center in order to make sleeve pipe, industry is also being used the concentrated blade assembly attached to jacket exterior always.According to same intervals and fixed screw, thing such as pincers neck grade together fixes these blade assemblies along the length of sleeve pipe.A problem of these blade assemblies is that because the rotation or the reciprocating motion of sleeve pipe, they become loose through regular meeting, slide along sleeve pipe then.So, they will often accumulate in one or more places, cause sleeve pipe to be difficult to maintain drill center, have also just reduced the quality of well cementing operation.Also have a problem to be, because blade assembly rotates lower slider in the high torque (HT) of sleeve pipe, fixed screw scratches sleeve pipe through regular meeting.These designated ports have reduced the integrality of sleeve pipe.Another problem of original technology is, these equipment are not stressed lubricated, quiet around the centralizer to reduce the frictional flow requirements of one's work, to help to discharge the drilling mud of thickness, reduce pump pressure.The subject matter of early stage solid centralizer is that it can't guarantee the normal rotation of sleeve pipe, can not remove from the original place when transferring sleeve pipe.

What U.S. Patent number 5095981 was represented is a kind of casing stabbing board of being made up of a continuous tubular metal body of circumference, and this metallic object and a bulk of sleeve pipe are combined closely.A plurality of sheet metals have been fixed on it; They are according to uniformly-spaced coming along the external diameter of metallic object and the axis parallel extension of metallic object together; The two ends of each blade are outwards relative with taper, and the external surface of relative broad is arranged, and are used for bearing wellhole or are used for handling the pressure of the outer tube of sleeve pipe.This centralizer is equipped with screw, and through the aperture on some blade and the metallic object, these screws can be used for catching sleeve pipe, with fixing centralizer.

What U.S. Patent number 6006830 was represented is a kind of casing stabbing board of being made up of annular solid; The centre have one greatly circular hole vertically pass this annular solid; The blade that is with a series of longitudinal extensions outward is centered around around the annular solid, is used for confirming the path between every pair of adjacent knife blades, and each path can both provide the centralizer fluid flow path between the two ends up and down; The outward flange of blade is radial, the contact surface that formation can contact with boring.The circular hole size of passing annular solid just in time is fit to be enclosed within around the sleeve pipe, utilizes the casing stabbing board fixed center of saying in the preceding text.This centralizer is to be processed by a kind of material that contains zinc or kirsite fully.

Come one of characteristics with reference to original technical centralizer of discussing before us again, like spacing ring.These characteristics are at the two ends of each centralizer a spacing ring to be housed all to guarantee rotating freely of centralizer.

Therefore spacing ring all is equipped with at the two ends of each centralizer.Want to use two-way centralizer, just must spacing ring be vertically fixed between the sliding end, and sliding end must fixedly secure the end at semielliptic spring, and spacing ring is fixed on the outside of sleeve pipe, sleeve pipe must remain on drill center.Such configuration provides desirable two-way function to centralizer, because centralizer can be not slack and undisciplined, and can slide, thereby get in the bigger sleeve pipe along with sleeve pipe, up to sleeve pipe foremost, and near spacing ring.The longitudinal extension of centralizer make tail end be towards away from spacing ring near the direction motion of front end.

With spacing ring the problem between the sliding end of being vertically fixed in is that the thickness of spacing ring makes the centralizer rib not topple over to internal diameter completely, and is attached on the sleeve pipe of movably having fixed centralizer along casing length.This makes spacing ring occupy valuable annular space, also just can not make subsequent casings reach desirable effect.

Typical centralizer is the Lirette centralizer, U.S. Patent number 5575333.That this centralizer utilizes is removable, spring bow separates sleeve pipe and borehole wall flexibly.The Lirette centralizer contains threaded end (TE), can connect the each several part of inner sleeve as casing coupling outside in the sleeve pipe.But this removable, spring bow probably stops the rotation of sleeve pipe in boring flexibly, because spring bow is not to be used for bearing sleeve pipe specially in the high torque (HT) of boring inner surface rotation generation.Yet current this is equipped with the invention of two rotary heads to rotate at both direction, therefore when well cementation, can produce extra whirlpool.These two rotary heads can be not floating between spacing ring, even because centralizer is fixed, they still can rotate very easily, and this is because these two rotary head meetings self are rotated along with the rotation of sleeve pipe.

The boring centralizer of U.S. Patent number 4830105 representative has an elongated handle, and body is relatively arranged on the handle slidably, and these two relative bodies link to each other with joint arm movably.U.S. Patent number 5261488 representative be one and have the equipment that being applicable to of spring transferred sleeve that extra energising equipment of these invention needs increase the flexural spring band.

These all equipment all have their problems separately.Generally speaking, the cause of these problems is because centralizer is the thing that adds of sleeve pipe.Like this, they enter in the boring, but can not in boring, keep their position, and when they move, often get into sleeve surface.More very, they can not accomplish to let cement be evenly distributed on the sleeve pipe.These all equipment all need to improve, so that sleeve pipe can be fixed on the sleeve and can rotate easily to increase whirlpool.

Though these equipment successfully used a lot of years in the boring condensation process, in the mud discharge process, the effect that rotates freely jointly of sleeve pipe and centralizer but can't be satisfactory.The improper homogeneity well cementation process that finally can influence of the rotation of sleeve pipe also just can not form annular space.In these cases, bad leak case can happen occasionally.Such leakage is very disadvantageous to the sealing of long-term integrality and cement sheath, and the amplitude of this leakage often reduces or stops leakage to our remedial measure of need implementing to cement the well greatly.Such leakage may cause a large amount blowout in the short time before cement is filled back and preliminary sedimentation.

In addition, the centralizer of original technology faces a subject matter in the sleeve pipe rotation.The solid centralizer of original technology can not guarantee the good rotation of sleeve pipe or when transferring sleeve pipe, be shifted.When sleeve pipe moved reciprocatingly, centralizer can be moved again subsequently, and when sleeve is removed, can not keep stable.

Drilling engineers are seeking the product that can substitute common centralizer for many years, make centralizer be fixed on the sleeve pipe and can let easily rotation and increase whirlpool of sleeve pipe.

For this reason, in boring, use high-quality centralizer and keep perfect sleeve pipe rotation and just become a permanent demand and be accustomed to.Therefore, the double rotating centralizer of on prior art, inventing utilizes two rotary heads of centralizer, has overcome the problem of original technical sleeve pipe rotation.These two rotary heads rely on allene screws to be fixed on the sleeve, and around self axle center along with centralizer together with clockwise with rotation counterclockwise.

For early stage solid centralizer, best bet is exactly that centralizer is floated on the normal rotation that guarantees sleeve pipe between the spacing ring, yet utilizes existing double rotating centralizer, even centralizer has been fixed, also need it not floated between the spacing ring.Centralizer can rotate easily, because two rotary heads self also can be rotated along with the rotation of sleeve pipe, has got rid of the demand of two spacing rings.Current equipment provides two functions of spacing ring, because it makes centralizer bidirectional-movement and maintenance stablize, has therefore solved original technical problem.

Secondly, because two rotary head separately rotations separately up and down, centralizer can produce extra whirlpool in pump mud process.The fact has proved utilizes the eddy current equipment of inducing to help well cementing operation.

The dual body of present invention has overcome these all problems.It can bear that sleeve pipe is done rotation and the high torque (HT) when moving back and forth and can not sliding, and when guaranteeing that cement stream is smooth, at an easy rate drilling mud is excluded, and reduce and insert pressure and pump slurry pressure, and the increase cement flow.

Summary of the invention

The purpose of this invention is for the centralizer of a two-way rotation is provided.

Another purpose is in order to provide one can do around self axle center clockwise and the double rotating centralizer that is rotated counterclockwise.

Another purpose be for provide one can be at the centralizer of free floating during rotation around self axle center.

Another purpose is in order to provide one to utilize this centralizer in the oil or the natural gas well, to carry out the method that sleeve is set upright.

From one or more aspects, another purpose is in order to satisfy industrial requirement mentioned above.

Another purpose is the centralizer in order to provide to be specially adapted for two rotary head rotations of well cementing operation.

Another purpose is in order to provide an ability to put into the double rotating centralizer of boring with the cover interface tube.The other end in axle center can be when free fluid rotates and the other end of centralizer put into boring.

Another purpose is for an economy is provided, and cost is low, the high and easy-operating double rotating centralizer of effectiveness.

According to characteristics of present invention, this has provided an equipment that uses in being adapted at holing, this equipment configuration two rotary heads and a ring.These two rotary heads are done round the axle center of self clockwise and are rotated counterclockwise.

On the ideal, two rotary heads all have and can when well cementing operation, improve the blade of eddy motion up and down.Two rotary heads can be according to the needs adjustment angle of operation up and down.These two rotary heads are fixed on the ring with locking device.

This centralizer has a function, and after centralizer was by built-in lock screw permanent position, two rotary heads of centralizer can be done clockwise with counterclockwise around the axle center of spacing ring and move.

Therefore current invention; Be about in the boring that is used in the recover petroleum or the natural gas well with the double rotating centralizer of setting upright the method for sleeve; Be two rotary heads that are fixed on the ring to be arranged, can do clockwise and the centralizer that is rotated counterclockwise around the axle center of self about one.

Description of drawings

Through mentioned above, in conjunction with the analysis diagram of extention in the manual, we can the more careful purpose of understanding this invention exactly.

Fig. 1 is the overall perspective of present invention.

Figure 1A and 1B are the last cylindrical front perspective views that centralizer shown in Fig. 1 uses.

Fig. 1 C and 1D are the front perspective views of the ring of the use of centralizer shown in Fig. 1.

Fig. 1 E is similar with 1B with Figure 1A with 1F, but demonstration is the following cylinder of centralizer shown in Fig. 1.

Fig. 2 is another phantom drawing of present invention.

Fig. 2 A and 2B are the cylindrical front perspective views on the top of using in the centralizer among Fig. 2.

The front perspective view of the ring that uses in the centralizer among Fig. 2 C and 2D Fig. 2.

Fig. 2 E is similar with 2B with Fig. 2 A with 2F, but displaying is the lower part cylinder of centralizer among Fig. 2.

Fig. 3 is another phantom drawing of the centralizer of present invention.

Fig. 3 A and 3B are the last cylindrical front perspective views that centralizer shown in Figure 3 uses.

Fig. 3 C and 3D are the front perspective views of employed ring in the centralizer shown in Figure 3.

Fig. 3 E is similar with 3B with Fig. 3 A with 3F, but displaying is the following cylinder of centralizer among Fig. 3.

Fig. 4 is another phantom drawing of present invention.

Fig. 4 A and 4B are the last cylindrical front perspective views of centralizer among Fig. 4.

Fig. 4 C and 4D are the front perspective views that centralizer shown in Fig. 4 uses ring.

Fig. 4 E is similar with 4B with Fig. 4 A with 4F, but displaying is the employed cylinder down of centralizer shown in Fig. 4.

Fig. 5 is another phantom drawing of the centralizer of present invention.

Fig. 5 A and 5B are the employed cylindrical front perspective views of centralizer shown in Fig. 5.

Fig. 5 C and 5D are the front perspective views of the employed ring of centralizer shown in Fig. 5.

Fig. 5 E is similar with 5B with Fig. 5 A with 5F, but displaying is the employed cylinder down of centralizer shown in Fig. 5.

Fig. 6 is another phantom drawing of the centralizer of present invention.

Fig. 6 A and 6B are the employed cylindrical front perspective views of centralizer shown in Fig. 6.

Fig. 6 C and 6D are the front perspective views of the employed ring of centralizer shown in Fig. 6.

Fig. 6 E is similar with 6B with Fig. 6 A with 6F, but displaying is the employed cylinder down of centralizer shown in Fig. 6.

The specific embodiment

Present invention is an equipment that is applicable to boring, and it is equipped with two rotary heads and a ring, and these two rotary heads are done clockwise around the axle center of self and are rotated counterclockwise.This invention is a double rotating centralizer, is equipped with unique double rotating design, has to force the advantage that stops.Such binding energy is done around the axle center of sleeve by rotary head and is rotated freely, and like this, even the double rotating centralizer remains on the sleeve, sleeve pipe also can easily rotate, and need not any spacing ring.Two rotary heads clockwise with can increase eddy motion counterclockwise.

In addition, even in mud, the locking device that this double rotating centralizer is adopted also can make sleeve pipe easily rotate.They have high abrasion, reduce functions such as torque, and can increase the whirlpool of cement paste.These two rotary heads can guarantee that a shearing pressure maintains within the scope of elastic band.

The also available following information of this invention further defines:

According to Fig. 1, this centralizer is equipped with spacing ring-4, last cylinder-1, following cylinder-10 and the blade-2,3 of combining closely with these two cylinders and installing by equal angular.Flat head screw on the ring-5 and screw thread-8 alternately arranged.Cylinder ring and annular groove-9 two ends equal diameters just in time engage with cylinder.A cylindrical up and down end has groove-6 and engagement of loops, so that form the centralizer of a two-way rotation.The wall thickness degree-7 of last cylinder-1 and following cylinder-10 depends on the boring in the environment for use of centralizer.

Each blade not only is arranged in vertically relative up and down between the cylindrical two ends, also is centered around the periphery of centralizer.The direction of blade guarantees that their outward flanges-3 separately can form a complete boring contact surface jointly around centralizer, and increases whirlpool, helps cleaning boring.

According to Figure 1A and 1B, an end of last cylinder-1 has groove-6, is suitable for merging the two-way rotation centralizer of formation with articulating.Go up cylindrical wall thickness degree and should depend on the boring in its operating environment.There is one group of blade-2,3 of arranging by equal angular on the surface of last cylinder-1.

According to Fig. 1 C and 1D, there are flat head screw-5 and screw thread-8 alternately to arrange on the ring, ring and cylinder size to fit up and down are to form a complete unified centralizer.The cylinder ring two ends are identical with cannelure-9 diameter, just in time engage with cylinder.

According to Fig. 1 E and 1F, there is groove-6 at following cylinder-1 two ends, just in time with engagement of loops, and form the centralizer of a two-way rotation.The thickness-7 of cylindrical wall depends on the boring in the centralizer operating environment down.There is one group of blade by the equidistant arrangement of equal angular-2,3 on the surface of following cylinder-1.

According to Fig. 2, centralizer is equipped with ring 4, last cylinder-9, and following cylinder-1 and a group blade-2,3,10,11 by the equidistant arrangement of equal angular, these blades and last cylinder-9 are combined closely with following cylinder-1.There is flat head screw-5 and screw thread-8 alternately to arrange on the ring.The cylinder two ends are identical with the diameter of ring groove size, just in time engage with cylinder.There is groove-12 at last cylinder two ends, just in time merge the centralizer that forms a two-way rotation with articulating.Groove-6 top can merge the centralizer that forms a two-way rotation with articulating.The

thickness

13,7 of last cylinder-9 and following cylinder-1 wall separately depends on the boring in the environment of centralizer use.

Each blade not only extends between the two ends of last cylinder-9 and following cylinder-1 of longitudinal extension, and be centered around centralizer around.The direction of blade makes their outward flanges-3,12 separately around centralizer, form a complete boring contact surface jointly, and increases eddy current, helps cleaning to hole.

According to Fig. 2 A and 2B, there is groove-12 at the two ends of last cylinder-9, just are being better than engagement of loops and are forming the centralizer of a two-way rotation.The thickness 13 of the wall of last cylinder-9 depends on the well bore of centralizer environment for use.There is one group of blade by the equidistant arrangement of equal angular-10,11 on the surface of last cylinder-9.

According to Fig. 2 C and 2D, there are flat head screw-5 and screw thread-8 alternately to arrange on the ring, just in time engage and form a complete unified centralizer with cylinder up and down.

According to Fig. 2 E and 2F, an end of following cylinder-1 have groove-6 can with engagement of loops, to form the centralizer of a two-way rotation.Down the thickness-7 of cylindrical wall depends on the boring in the environment for use of centralizer.There is one group of blade by the equidistant arrangement of equal angular-2,3 on the surface of following cylinder-1.

According to Fig. 3, centralizer is equipped with ring 4, last cylinder-9, and the blade-10,11 of following cylinder-the 9 and a group equidistant arrangement of equal angular, these blades and last cylinder-9 are combined closely with following cylinder-9.There is flat head screw-5 and screw thread-8 alternately to arrange on the ring.The cylinder two ends are identical with the diameter of ring groove size, just in time engage with cylinder.Last cylinder one end has groove-12, just in time merges the centralizer that forms a two-way rotation with articulating.Groove-6 top can merge the centralizer that forms a two-way rotation with articulating.The thickness 13 of the wall of cylinder-9 depends on the boring in the environment that centralizer uses up and down.

Each blade not only extend and the two ends of the last cylinder-9 of longitudinal extension and following cylinder-9 between, and be centered around centralizer around.The direction of blade makes their outward flanges-11 separately around centralizer, form a complete boring contact surface jointly, and increases eddy current, helps cleaning to hole.

According to Fig. 3 A and 3B, there is groove-12 at the two ends of last cylinder-9, just in time merge the centralizer that forms a two-way rotation with articulating.The thickness 13 of the wall of last cylinder-9 depends on the boring in the centralizer environment for use.There is one group of blade by the equidistant arrangement of equal angular-10,11 on the surface of last cylinder-9.

According to Fig. 3 C and 3D, there are flat head screw-5 and screw thread-8 alternately to arrange on the ring, just in time engage and form a complete unified centralizer with cylinder up and down.

According to Fig. 3 E and 3F, an end of following cylinder-9 have groove-12 can with engagement of loops, to form the centralizer of a two-way rotation.Down the thickness-13 of cylindrical wall depends on the boring in the environment for use of centralizer.There is one group of blade by the equidistant arrangement of equal angular-10,11 on the surface of following cylinder-9.

According to Fig. 4, centralizer is equipped with ring 4, last cylinder-14, and the blade-2,3,15,16 of following cylinder-the 1 and a group equidistant arrangement of equal angular, blade and last cylinder-14 are combined closely with following cylinder-1.There is flat head screw-5 and screw thread-8 alternately to arrange on the ring.The cylinder two ends are identical with the diameter of ring groove size, just in time engage with cylinder.Last cylinder one end has groove-17, just in time merges the centralizer that forms a two-way rotation with articulating.Groove-6 top can merge the centralizer that forms a two-way rotation with articulating.The

thickness

18,7 of the wall of last cylinder-14 and following cylinder-1 depends on the boring in the environment of centralizer use.

Each blade not only extends between the two ends of vertically relative last cylinder-14 and following cylinder-1, and be centered around centralizer around.The direction of blade makes their outward flanges-3 and 16 separately around centralizer, form a complete boring contact surface jointly, and increases eddy current, helps cleaning to hole.

According to Fig. 4 A and 4B, an end of last cylinder-14 has groove-17, just in time merges the centralizer that forms a two-way rotation with articulating.The thickness 18 of the wall of last cylinder-14 depends on the boring in the centralizer environment for use.There is one group of blade by the equidistant arrangement of equal angular-15,16 on the surface of last cylinder-14.

According to Fig. 4 C and 4D, there are flat head screw-5 and screw thread-8 alternately to arrange on the ring, just in time engage and form a complete unified centralizer with cylinder up and down.

According to Fig. 4 E and 4F, an end of following cylinder-1 have groove-6 can with engagement of loops, to form the centralizer of a two-way rotation.Down the thickness-7 of cylindrical wall depends on the boring in the environment for use of centralizer.There is one group of blade by the equidistant arrangement of equal angular-2,3 on the surface of following cylinder-1.

According to Fig. 5, centralizer is equipped with ring 4, last cylinder-14, and the blade-10,11,15,16 of following cylinder-the 1 and a group equidistant arrangement of equal angular, blade and last cylinder-14 are combined closely with following cylinder-9.There is flat head screw-5 and screw thread-8 alternately to arrange on the ring.The cylinder two ends are identical with the diameter of ring groove size, just in time engage with cylinder.Last cylinder one end has groove-17, just in time merges the centralizer that forms a two-way rotation with articulating.Groove-12 top can merge the centralizer that forms a two-way rotation with articulating.The

thickness

18,13 of last cylinder-14 and following cylinder-9 wall separately depends on the boring in the environment of centralizer use.

Each blade not only extends between the two ends of vertically relative last cylinder-14 and following cylinder-9, and be centered around centralizer around.The direction of blade makes their outward flanges-11 and 16 separately around centralizer, form a complete boring contact surface jointly, and increases eddy current, helps cleaning to hole.

According to Fig. 5 A and 5B, an end of last cylinder-14 has groove-17, just in time merges the centralizer that forms a two-way rotation with articulating.The thickness 18 of the wall of last cylinder-14 depends on the boring in the centralizer environment for use.There is one group of blade by the equidistant arrangement of equal angular-15,16 on the surface of last cylinder-14.

According to Fig. 5 C and 5D, there are flat head screw-5 and screw thread-8 alternately to arrange on the ring, just in time engage and form a complete unified centralizer with cylinder up and down.

According to Fig. 5 E and 5F, an end of following cylinder-9 have groove-12 can with engagement of loops, to form the centralizer of a two-way rotation.The thickness of the cylindrical wall in lower part-13 depends on the boring in the environment for use of centralizer.There is one group of blade by the equidistant arrangement of equal angular-10,11 on the surface of following cylinder-1.

According to Fig. 6, centralizer is equipped with ring 4, last cylinder-14, and the blade-15,16 of following cylinder-the 14 and a group equidistant arrangement of equal angular, blade and top cylinder-14 are combined closely with lower part cylinder-14.There is flat head screw-5 and screw thread-8 alternately to arrange on the ring.The cylinder two ends are identical with the diameter of ring groove size, just in time engage with cylinder.Last cylinder one end has groove-17, just in time merges the centralizer that forms a two-way rotation with articulating.The thickness 18 of the wall of cylinder-14 depends on the boring in the environment that centralizer uses up and down.

Each blade not only extends between the two ends of vertically relative last cylinder-14 and following cylinder-14, and be centered around centralizer around.The direction of blade makes their outward flanges-16 separately around centralizer, form a complete boring contact surface jointly, and increases eddy current, helps cleaning to hole.

According to Fig. 6 A and 6B, an end of top cylinder-14 has groove-17, just in time merges the centralizer that forms a two-way rotation with articulating.The thickness 18 of the wall of last cylinder-14 depends on the well bore of centralizer environment for use.There is one group of blade by the equidistant arrangement of equal angular-15,16 on the surface of last cylinder-14.

According to Fig. 6 C and 6D, there are flat head screw-5 and screw thread-8 alternately to arrange on the ring, just in time engage and form a complete unified centralizer with cylinder up and down.

The blade of centralizer remains in the boring tubulose centralizer, and bears the pressure at the boring interior wall, reduces friction.

In an analysis diagram, the direction of blade left and with 15 ° to 35 ° fixed angle on cylindrical surface.

In another analysis diagram, the direction of blade to the right and with 15 ° to 35 ° fixed angle on cylindrical surface.

In another analysis diagram, blade is vertical, with 90 ° fixed angle on cylindrical surface.

In another analysis diagram, whole centralizer is by as an integral body (though blade-10 can independent installation and particular requirement is installed is installed on the cylinder).

In another analysis diagram, the main body of centralizer is by zinc or kirsite, aluminum or aluminum alloy, and metal such as iron and steel or steel and alloy and phenolic resins and various resin material are formed.

In another analysis diagram, the main body of centralizer is made up of kirsite, is ZAMAC-12 on the ideal.

Also have in the analysis diagram, the main body of centralizer is made up of aluminium alloys, is ALUM-6 on the ideal.

Also have in the analysis diagram, the centralizer main body is made up of phenolic resins and various resin material, is HNBR on the ideal.

In another analysis diagram, blade can be wrapped with teflin tape.

The cylinder up and down of centralizer has blade, and these blades can improve eddy motion when well cementing operation.These two cylinders are fixed on the ring with locking device.This double rotating centralizer can at one end engage with casing coupling, closes in a termination in the other end and axle center.The other end in axle center can engage and do to rotate freely and rotatablely move with the miscellaneous part of centralizer.

In an analysis diagram, blade can rotate when reducing sleeve pipe, and two rotary heads still can remain on original position.

The staff of skilled this operation is easy to just can understand other transformation and changes about this invention through the explanation of front.Therefore, because we have only used the analysis diagram of minority to resolve to this invention, clearly, do not departing from outside this scope of invention and the purpose, we also may make an amendment.

Claims

1. double rotating centralizer is characterized in that: be equipped with:

A ring (4),

A cylinder (1) that vertically is installed in the top edge of ring,

The cylinder of a lower limb that vertically is installed in ring and

One group by the equidistant arrangement of equal angular, the blade (10) of combining closely with cylinder up and down.

2. double rotating centralizer as claimed in claim 1 is characterized in that: have flat head screw-5 and screw thread-8 alternately to arrange on the said ring.

3. double rotating centralizer as according to claim 1 or claim 2, it is characterized in that: the diameter at the two ends of the ring in the described double rotating centralizer is identical with the diameter of annular groove-9, just in time engages with cylinder.

4. double rotating centralizer as claimed in claim 1; It is characterized in that: on one group of blade ideal in the said double rotating centralizer upper surface-3 and soffit-2 are arranged by the equidistant arrangement of equal angular; Preferably, but be not limited to, cylindrical surface size conforms to reaching the standard grade.

5. like claim 1 or 4 described double rotating centralizers, it is characterized in that: the blade in the said double rotating centralizer extends between the cylinder two ends relative with following cylinder.

6. like claim 4 or 5 described double rotating centralizers, it is characterized in that: the blade in the said double rotating centralizer is centered around the surface of centralizer.

7. like claim 4 or 6 described double rotating centralizers, it is characterized in that: the blade in the said double rotating centralizer, or vertical, but is not limited only to this to the right preferably left.

8. like claim 4 or 7 described double rotating centralizers, it is characterized in that: in the said double rotating centralizer left and blade to the right preferably install according to 15 ° to 35 ° angle.

9. like claim 4 or 8 described double rotating centralizers, it is characterized in that: the vertical blade in the said double rotating centralizer is to install according to 90 ° angle.

10. these are roughly introductions of double rotating centralizer, please with reference to analysis diagram and explanation.