CN104373059A - Floating guide shoe - Google Patents
Floating guide shoe Download PDFInfo
- Publication number
- CN104373059A CN104373059A CN201410643702.1A CN201410643702A CN104373059A CN 104373059 A CN104373059 A CN 104373059A CN 201410643702 A CN201410643702 A CN 201410643702A CN 104373059 A CN104373059 A CN 104373059A
- Authority
- CN
- China
- Prior art keywords
- central tube
- guide shoe
- floating guide
- opening
- bits cover
- 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.)
- Granted
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
- E21B17/14—Casing shoes for the protection of the bottom of the casing
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
Abstract
The invention provides a floating guide shoe. The floating guide shoe comprises a center pipe, a sealing base, a sealing plug, a shearing pin, an outer sleeve, a scrap preventing sleeve, a pressure balance hole and through holes, wherein the sealing base is sleeved with the center pipe and located at the first end of the center pipe, the sealing plug is sleeved with the sealing base, the shearing pin is connected between the sealing plug and the sealing base, the outer sleeve is arranged outside the center pipe in a sleeving mode, a cavity with an opening is formed by the first end of the outer sleeve and the first end of the center pipe, the opening is communicated with the exterior of the center pipe, the second end of the center pipe is closed by the second end of the outer sleeve, the scrap preventing sleeve is annular, is arranged at the opening and controls the opening to be opened or closed, the pressure balance hole is formed in the second end of the outer sleeve, and the through holes penetrate through the side wall of the center pipe, are connected with the cavity and located between the sealing base and the pressure balance hole. The floating guide shoe is simple in structure, convenient to use, high in reliability and low in production and processing cost.
Description
Technical field
The present invention relates to petroleum natural gas exploration field, be specifically related to a kind of cementing tool, be i.e. a kind of guide shoe, especially a kind of floating guide shoe.
Background technology
At present in oil and gas exploration and development process, usually need to use this cementing tool of guide shoe.People have invented " sleeve eccentric guide shoe " (application number 201120490097.0), " hydraulic drive rotation sleeve guide shoe " (application number 201110235894.9), " a kind of well drilling well completion casing rolling casing guide " (application number CN200720169377.5) etc. in recent years, these several inventions are main it is considered that how to strengthen the guiding function of guide shoe, help, at the bottom of the smooth lower going-into-well of sleeve pipe, to prevent mouth at the bottom of sleeve pipe from touching and scrape or insert the borehole wall.
But the defect of these several invention existence does not consider that landwaste invades guide shoe and blocks the problem of sleeve channel.For the operation of long horizontal sections horizontal cementing, use conventional guide shoe or float shoe, the landwaste in pit shaft easily enters guide shoe in setting of casing process, causes sleeve pipe circulation canal to block.
In sum, in prior art, there is following problem: for the operation of long horizontal sections horizontal cementing, use conventional guide shoe or float shoe, the landwaste in pit shaft easily enters guide shoe in setting of casing process, cause sleeve pipe circulation canal to block.
Summary of the invention
The invention provides a kind of guide shoe or floating guide shoe, to solve the problem that landwaste invades guide shoe blocking sleeve pipe circulation canal.
For this reason, the present invention proposes a kind of guide shoe or floating guide shoe, and described floating guide shoe comprises:
Central tube;
Seal receptacle, is sheathed in described central tube, and is positioned at the first end of described central tube;
Seal plug, is sheathed in described seal receptacle;
Shear pin, is connected between described seal plug and described seal receptacle;
Overcoat, is set in outside described central tube, and the first end of described overcoat and the first end of described central tube form the cavity with opening, and described opening is communicated with outward with described central tube, and the second end of described overcoat closes the second end of described central tube;
Anti-bits cover, described anti-bits cover is ring-type, is arranged on described opening part, controls the switch of described opening;
Pressure compensation opening, is arranged on the second end of described overcoat;
Through hole, run through the sidewall of described central tube and be connected with described cavity, described through hole is between described seal receptacle and described pressure compensation opening.
Further, described anti-bits cover has two ends, and the first end of described anti-bits cover is enclosed within outside the first end of described central tube, and the second end of described anti-bits cover is fixedly connected on the first end of described overcoat.
Further, the second end of described overcoat is hemispherical or semielliptical shape.
Further, the axis of described pressure compensation opening overlaps with the axis of described central tube.
Further, the diameter of described pressure compensation opening is 2mm.
Further, when casing annulus does not circulate, on the axial cross section of described anti-bits cover, the first end of described anti-bits cover is the straightway of parallel described central tube sidewall, second end of described anti-bits cover is connect the oblique line section between described straightway and the first end of described overcoat, and described straightway and described oblique line section are formed and bend.
Further, the length of described straightway is greater than the length of described oblique line section.
Further, when casing annulus does not circulate, described seal plug is to the bore seal of described central tube, and the first end of described anti-bits cover is attached on the outer wall of described central tube, blocks drilling cuttings and enters described central tube; When setting up casing annulus circulation, described shear pin is cut short, and described seal plug goes downwards to the second end of described central tube, removes the bore seal to described central tube, the first end of described anti-bits cover, away from the outer wall of described central tube, exposes described opening.
In setting of casing process, when not setting up sleeve pipe-annular circulation, floating guide shoe prevents drilling cuttings from entering bunch tube under the protection of anti-bits cover, overcoat, and protection float collar enters under guiding sleeve string is smooth; When by designing requirement by under bunch tube behind precalculated position in well, once need to set up sleeve pipe-annular circulation, then build the pressure in sleeve pipe at well head, build the pressure after certain value, it is descending that seal plug in floating guide shoe cuts off shear pin, anti-bits cover is opened, and sets up circulation canal, just can carry out follow-up note for operation.
Effect of the present invention has:
1, debris blockage sleeve pipe is prevented.Due to when not setting up sleeve pipe-annular circulation, the first end of anti-bits cover is attached on the outer wall of described central tube, blocks drilling cuttings and enters described central tube, so, debris blockage sleeve pipe circulation canal can be prevented.
2, float collar is protected.In actual use, guide shoe is placed in the bottom of float collar, and high strength, the high sealing performance of guide shoe dependence self, replace float collar to bear high back pressure in well, thus play the effect of protection float collar.
3, floating effect.Floating guide shoe good seal performance of the present invention, intensity are high, can produce certain buoyancy together with floating coupling to sleeve pipe.
Accompanying drawing explanation
Fig. 1 is the internal construction schematic diagram of the floating guide shoe of the embodiment of the present invention, the state wherein do not circulated for casing annulus;
Fig. 2 is the operating principle schematic diagram of the floating guide shoe of the embodiment of the present invention, wherein for setting up the state of casing annulus circulation.Drawing reference numeral illustrates:
1-central tube, 2-seal receptacle, 3-seal plug, 4-shear pin, 5-anti-bits cover, 6-overcoat, 7-pressure compensation opening 8 opening 10 through hole 60 cavity
Detailed description of the invention
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and the present invention is described.
As shown in Figure 1, the floating guide shoe of the embodiment of the present invention comprises:
Central tube 1;
Seal receptacle 2, is sheathed in described central tube 1, and is arranged in the first end (Fig. 1, the left end of central tube) of described central tube;
Seal plug 3, be sheathed in described seal receptacle 2, seal receptacle is fixed in central tube, supports seal plug, ensures that seal plug can only towards shear pin direction unidirectional operation; ;
Shear pin 4, is connected between described seal plug 3 and described seal receptacle 2, such as, be connected between the sidewall of seal plug 3 and the sidewall of described seal receptacle 2;
Overcoat 6, be set in outside described central tube 1, the first end of described overcoat is (in Fig. 1, the left end of overcoat is the first end of overcoat) form the cavity 60 with opening 8 with the first end of described central tube, described opening 8 is communicated with outward with described central tube, and to form casing annulus circulation when opening is opened, the second end of described overcoat is (in Fig. 1, the right-hand member of overcoat is the second end of overcoat) close second end (in Fig. 1, the right-hand member of central tube) of described central tube;
Anti-bits cover 5, described anti-bits cover is ring-type, is arranged on described opening part, controls the switch of described opening; When not setting up casing annulus circulation, anti-bits cover 5 closing openings, prevents debris blockage sleeve pipe; Once need to set up casing annulus circulation, in floating guide shoe, pressure is greater than outer (annular space) pressure of guide shoe, and cause anti-bits to overlap and strut to annular space, anti-bits cover is opened, and exposes described opening, sets up circulation canal, just can carry out follow-up note for operation;
Pressure compensation opening 7, is arranged on the second end of described overcoat 6, and can play the effect of floating guide shoe internal and external pressure balance, whether canal float guide shoe does not set up circulation, and pressure compensation opening 7 does not participate in cyclic process;
Through hole 10, runs through the sidewall of described central tube and is connected with described cavity, and described through hole 10 is between described seal receptacle and described pressure compensation opening.Circulation canal of the present invention is not through the perforate (pressure compensation opening 7) of guide shoe foot, and be through the through hole of the side of guide shoe, the effect of pressure compensation opening is only played in the perforate of guide shoe foot, and landwaste can not enter guide shoe through pressure compensation opening 7.
In setting of casing process, when not setting up sleeve pipe-annular circulation, floating guide shoe prevents drilling cuttings from entering bunch tube under the protection of anti-bits cover, overcoat, and protection float collar enters under guiding sleeve string is smooth; When by designing requirement by under bunch tube behind precalculated position in well, once need to set up sleeve pipe-annular circulation, then build the pressure in sleeve pipe at well head, build the pressure after certain value, it is descending that seal plug in floating guide shoe cuts off shear pin, anti-bits cover is opened, and sets up circulation canal, just can carry out follow-up note for operation.Anti-bits cover, overcoat can prevent landwaste from entering guide shoe and reduce the frictional resistance between guide shoe and the borehole wall.
Further, as shown in Figure 1, the first end of described anti-bits cover is enclosed within outside the first end of described central tube, do not formed with described central tube and be connected or only form laminating, under the effect of highly pressurised liquid, the first end of anti-bits cover can be rushed to open or strut, and exposes opening, and the second end of described anti-bits cover is fixedly connected on the first end of described overcoat.Like this, anti-bits nested structure is simple, is convenient to fabrication and installation.
Further, the second end of described overcoat is hemispherical or semielliptical shape.Certain buoyancy can be produced to sleeve pipe like this together with floating coupling.
Further, the axis of described pressure compensation opening 7 overlaps with the axis of described central tube.Like this, pressure compensation opening is in the bottom of guide shoe, is in the centre position of pit shaft in horizontal well, can play the effect of floating guide shoe inside and outside differential pressure balance preferably.
Further, the diameter of described pressure compensation opening is 2mm, can prevent landwaste from entering.
Further, as shown in Figure 1, when casing annulus does not circulate, on the axial cross section of described anti-bits cover (parallel center pipe axle to cross section), the first end (left end that anti-bits overlap) of described anti-bits cover is the straightway of parallel described central tube sidewall, for connecting the oblique line section between described straightway and the first end of described overcoat, described straightway and described oblique line section are formed and bend second end (right-hand member of anti-bits cover) of described anti-bits cover.Like this, be convenient to make, be convenient to the control of opening.
Further, the length of described straightway is greater than the length of described oblique line section.The length of straightway is longer, enters guide shoe to prevent the landwaste in pit shaft under High Pressure.Anti-bits cover makes with acrylonitrile-butadiene rubber, can complete folding many times, and length of straigh line is 90mm.
Further, when casing annulus does not circulate, described seal plug is to the bore seal of described central tube, and the first end of described anti-bits cover is attached on the outer wall of described central tube, blocks drilling cuttings and enters described central tube; As shown in Figure 2, when casing annulus circulation set up by needs, build the pressure in sleeve pipe at well head, build the pressure after certain value, described shear pin 4 is cut short, described seal plug 3 goes downwards to the second end of described central tube, and by the spherical of overcoat second end or ellipsoid shape inwall spacing, remove the bore seal to described central tube, highly pressurised liquid according to the direction of arrow in figure through the through hole of central tube sidewall, the cavity between central tube and overcoat, wash or strut anti-bits cover open at opening part, expose opening, thus set up circulation canal.In actual use, floating guide shoe is connected to the foot of bunch tube.Floating guide shoe can as the instrument coordinating floating coupling to use during long horizontal sections horizontal well casing job, and protection float collar damages from high pressure.Once after starting casing annulus circulation, floating guide shoe will lose float function in setting of casing process, but can continue to play prevent debris blockage, guiding sleeve under the effect that enters.Like this, the present invention can guiding sleeve smoothly under enter, solve again the problem of debris blockage sleeve pipe, and play a protective role to float collar, and structure is simple, easy to use, reliability is high, and production and processing cost is low, easily sets up circulation.
The present invention can prevent debris blockage sleeve pipe circulation canal, can protect float collar again.
The foregoing is only the schematic detailed description of the invention of the present invention, and be not used to limit scope of the present invention.For each ingredient of the present invention can mutually combine under the condition of not conflicting, any those skilled in the art, equivalent variations done under the prerequisite not departing from design of the present invention and principle and amendment, all should belong to the scope of protection of the invention.
Claims (8)
1. a floating guide shoe, is characterized in that, described floating guide shoe comprises:
Central tube;
Seal receptacle, is sheathed in described central tube, and is positioned at the first end of described central tube;
Seal plug, is sheathed in described seal receptacle;
Shear pin, is connected between described seal plug and described seal receptacle;
Overcoat, is set in outside described central tube, and the first end of described overcoat and the first end of described central tube form the cavity with opening, and described opening is communicated with outward with described central tube, and the second end of described overcoat closes the second end of described central tube;
Anti-bits cover, described anti-bits cover is ring-type, is arranged on described opening part, controls the switch of described opening;
Pressure compensation opening, is arranged on the second end of described overcoat;
Through hole, run through the sidewall of described central tube and be connected with described cavity, described through hole is between described seal receptacle and described pressure compensation opening.
2. floating guide shoe as claimed in claim 1, is characterized in that, described anti-bits cover has two ends, and the first end of described anti-bits cover is enclosed within outside the first end of described central tube, and the second end of described anti-bits cover is fixedly connected on the first end of described overcoat.
3. floating guide shoe as claimed in claim 2, is characterized in that, the second end of described overcoat is hemispherical or semielliptical shape.
4. floating guide shoe as claimed in claim 1, is characterized in that, the axis of described pressure compensation opening overlaps with the axis of described central tube.
5. floating guide shoe as claimed in claim 4, is characterized in that, the diameter of described pressure compensation opening is 2mm.
6. floating guide shoe as claimed in claim 1, it is characterized in that, when casing annulus does not circulate, on the axial cross section of described anti-bits cover, the first end of described anti-bits cover is the straightway of parallel described central tube sidewall, second end of described anti-bits cover is connect the oblique line section between described straightway and the first end of described overcoat, and described straightway and described oblique line section are formed and bend.
7. floating guide shoe as claimed in claim 6, is characterized in that, the length of described straightway is greater than the length of described oblique line section.
8. floating guide shoe as claimed in claim 1, it is characterized in that, when casing annulus does not circulate, described seal plug is to the bore seal of described central tube, the first end of described anti-bits cover is attached on the outer wall of described central tube, blocks drilling cuttings and enters described central tube; When setting up casing annulus circulation, described shear pin is cut short, and described seal plug goes downwards to the second end of described central tube, removes the bore seal to described central tube, the first end of described anti-bits cover, away from the outer wall of described central tube, exposes described opening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410643702.1A CN104373059B (en) | 2014-11-10 | 2014-11-10 | Floating guide shoe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410643702.1A CN104373059B (en) | 2014-11-10 | 2014-11-10 | Floating guide shoe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104373059A true CN104373059A (en) | 2015-02-25 |
| CN104373059B CN104373059B (en) | 2017-02-08 |
Family
ID=52552224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410643702.1A Active CN104373059B (en) | 2014-11-10 | 2014-11-10 | Floating guide shoe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104373059B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3135854A1 (en) * | 2015-08-24 | 2017-03-01 | Politechnika Gdanska | Wellbore reaming tool |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201598987U (en) * | 2010-02-12 | 2010-10-06 | 赵春余 | Positive constant-pressure blocking casing guide shoe |
| CA2742660A1 (en) * | 2011-06-08 | 2012-12-08 | Randle M. Loree | Method and apparatus for running casing in a wellbore with a fluid driven rotatable shoe |
| CN202673186U (en) * | 2012-07-17 | 2013-01-16 | 中国石油集团长城钻探工程有限公司 | Branch well drillable well completion guiding shoe |
| CN202673187U (en) * | 2012-07-20 | 2013-01-16 | 中国石油集团长城钻探工程有限公司 | Rotating homing type guiding shoe |
| CN203515370U (en) * | 2013-08-29 | 2014-04-02 | 山东华油博远石油开发有限公司 | Rotation deblocking type well completion guiding shoe |
| CN203742480U (en) * | 2014-01-29 | 2014-07-30 | 中国石油集团西部钻探工程有限公司 | Clamping-preventing casing guide device |
| CN204283247U (en) * | 2014-11-10 | 2015-04-22 | 中国石油天然气集团公司 | Floating guide shoe |
-
2014
- 2014-11-10 CN CN201410643702.1A patent/CN104373059B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201598987U (en) * | 2010-02-12 | 2010-10-06 | 赵春余 | Positive constant-pressure blocking casing guide shoe |
| CA2742660A1 (en) * | 2011-06-08 | 2012-12-08 | Randle M. Loree | Method and apparatus for running casing in a wellbore with a fluid driven rotatable shoe |
| CN202673186U (en) * | 2012-07-17 | 2013-01-16 | 中国石油集团长城钻探工程有限公司 | Branch well drillable well completion guiding shoe |
| CN202673187U (en) * | 2012-07-20 | 2013-01-16 | 中国石油集团长城钻探工程有限公司 | Rotating homing type guiding shoe |
| CN203515370U (en) * | 2013-08-29 | 2014-04-02 | 山东华油博远石油开发有限公司 | Rotation deblocking type well completion guiding shoe |
| CN203742480U (en) * | 2014-01-29 | 2014-07-30 | 中国石油集团西部钻探工程有限公司 | Clamping-preventing casing guide device |
| CN204283247U (en) * | 2014-11-10 | 2015-04-22 | 中国石油天然气集团公司 | Floating guide shoe |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3135854A1 (en) * | 2015-08-24 | 2017-03-01 | Politechnika Gdanska | Wellbore reaming tool |
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| Publication number | Publication date |
|---|---|
| CN104373059B (en) | 2017-02-08 |
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