CN102787826A - Magnetic float collar float shoe - Google Patents
Magnetic float collar float shoe Download PDFInfo
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- CN102787826A CN102787826A CN2011101342163A CN201110134216A CN102787826A CN 102787826 A CN102787826 A CN 102787826A CN 2011101342163 A CN2011101342163 A CN 2011101342163A CN 201110134216 A CN201110134216 A CN 201110134216A CN 102787826 A CN102787826 A CN 102787826A
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Abstract
The invention relates to the technical field of well cementing tools, in particular to a well cementing float collar float shoe with magnetic resetting as the main characteristic, namely a magnetic float collar float shoe. The magnetic float collar float shoe comprises a body and a magnetic resetting check valve core formed by magnetic steel, a ball seat, a magnetic induction ball, a guide barrel, a deflection guide ring and the like, wherein the body and the magnetic resetting check valve core are solidified into a whole through cementing materials. In the normal state, the magnetic induction ball is attracted by the magnetic steel to be kept in the ball seat and is in a reverse normally-closed state. During circulation, the magnetic induction ball is rushed downwards by fluid and guided to one side through the deflection guide ring to avoid blocking the fluid and enable the fluid to pass smoothly. When a pump stops working, the magnetic induction ball returns back to the ball seat quickly under the effect of magnetic force, and performs reverse close seal to prevent the fluid from flowing back. Due to the fact that accessories such as a spring and a spring seat, or a ball bar and a valve rod are eliminated, the magnetic float collar float shoe has the advantages of being smooth in fluid channel, small in flowing resistance, free of risks of impurity winding and spring failure, and the like. In addition, the magnetic float collar float shoe is reasonable in structure, easily accessible in material, stable in high-temperature resistance, high-pressure resistance, sulfur resistance and corrosion resistance, reliable in sealing, strong in drillability and suitable for well cementing of various kinds.
Description
One, technical field
The present invention relates to a kind of float collar float shoe, especially a kind of float collar float shoe of magnetic force reduction type spool.
Two, background technology
In the drilling process of underground mineral resources exploration and developments such as oil, natural gas, underground heat, bittern, need to use cementing tools such as float collar float shoe usually.
The float collar float shoe is the crucial annex of the cover of one in bunch tube and the well cementation process, and effect is that guiding sleeve is gone into well smoothly, and the suffered buoyancy of tubing string during the adjustment setting of casing prevents during well cementation that cement paste from flowing backwards, and can accept plug and accomplish bruising.The float collar float shoe is a kind of ball-and-seat that can bear complex conditions influences such as down-hole formation HTHP and all kinds of active sulfur body mediums on the well cementation sleeved pipe that is installed on and works in essence, and the well cementation circle also claims back pressure valve or back-pressure valve.Effectively closing and sealing of spool is the key of float collar float shoe.
The cementing slurry float collar float shoe of flowing through is injected into casing annulus, bears buffer brake from outside to inside then, so in the well cementation process, in case the float collar float shoe lost efficacy, will bring enormous economic loss.Existing float collar float shoe; Though Products in Seriesization and product obtained qualitatively improve and improve; But along with the exploration and development development of the situation of domestic and international oil gas field and stratum resource and the progress of drilling technology; The well cementation of the various technology types under deep-well, ultradeep well, high angle hole, horizontal well and the complex geological condition continues to bring out, to the float collar float shoe require increasingly high.High temperature resistant, high pressure resistant, erosion resistance, antiacid alkali, oil resistant, anti-sulphur, shock resistance, area of passage is big, flow resistance is little; Antiwind ability is strong; Drillability can be good, reverse sealing reliability high, these all are the basic demands to following float collar float shoe, also are developing direction.Existing just at present make a brief analysis, be enough to explain that existing float collar float shoe urgent need improves in reverse sealing situation with the float collar float shoe.
At present at the float collar float shoe of usefulness, its back pressure seal form that resets roughly has three kinds: promptly natural float-ball type, compression spring brace type and torsion spring tongue plate type.Its basic condition is following: 1, natural float-ball type: the float collar float shoe of this sealing requires the apparent density of ball float will be lower than fluid density; The density that will be lower than water in principle just can effectively be guaranteed; Yet; Low-density spheroid like this (comprising hollow ball) itself intensity, rigidity, hardness, abrasion resistance and aspect performance such as anticorrosive, desire satisfies in the complicated adverse circumstances requirement of thousands of meters underground HTHP highly corrosive, often difficulty very.2, compression spring brace type: this is the sealing means that used float collar float shoe generally adopts during well cementation in the drilling engineering both at home and abroad at present, and the elastic force through the compression spring carries out back resetting control, makes the float collar float shoe keep airtight normality, and general effect is pretty good.But in well cementing operation, also there is the float collar float shoe poorly sealed often, causes the situation of well cementing operation failure to take place.Trace it to its cause, generally show deficiency in the following aspects: the one, back-moving spring is too high because of the well formation temperature that has, and in addition through circulation for a long time, thousands of compressions have produced fatigue, the elastic effect variation, pre-sealed power dies down; The 2nd, the well that has often contains more impurity owing to complex situations such as leakage occurred in the drilling fluid after handled such as leak stopping, and cellulosic material twines easily or hangs tag and on spring, fettered its regular event; The 3rd, the non-spherical valve body that has is because of the contact point of its sealing surface and seal receptacle is single, is prone to make the vulcanized rubber sealing surface to damage, the valve body material slag inclusion that has or receive corrosion to cause the face seal defective; The 4th, most springs pivot angle amplitude at work is excessive, and especially in the well cementation of inclined shaft, horizontal well, under action of gravity, departing from can be bigger, the poor reliability of the directed fixed point of valve body return; The 5th, strong impaction ball hurdle caused the part rib to damage when the valve body that has was worked, and the ball hurdle lost efficacy, and valve body comes off; The 6th, the valve rod that has (valve handle) is poor at the gathering sill fitness, in high-frequency, has occurred under the situation of big stroke, non-power placed in the middle wearing and tearing and hanging tag, and is difficult to normally reset; The 7th, between spool that has and body because of cast difference or because of the non-casting type packing that has damages, what have has also formed microgap integral sealing inefficacy because of the material coefficient of expansion under the hot conditions of down-hole inconsistent under high pressure and strong vibration.And the closing with poorly sealed of float collar float shoe causes cement paste to flow backwards, and can cause tail pipe, twin-stage or special cementing well construction accident and cementing quality accident such as multistage when serious.Except the deficiency of above sealing performance aspect, the spring valve pole socket that it is inner or the contents such as rib on ball hurdle also have influence on the unobstructed of runner, have increased flow resistance.Simultaneously; The contents or the accessory of hard metal material such as hard spring steel and so on, the drilling out work after cementing the well of also giving causes adverse effect, and the one, the spring steel cause damage to drill bit easily; The 2nd, drilling out speed is slack-off, badly influences bit speed.3, torsion spring tongue plate type: this is a kind of spring base that will compress the spring brace type on the structure from vertically having changed over laterally, has changed telescopic spring the mode of torsion spring into, in fact many deficiencies of this and the compression spring brace type of failing fundamentally to overcome.The valve rod of its horizontally set, the possibility that receives the impurity winding is big all the better.Therefore, the application of this type torsion spring tongue plate type float collar float shoe also can not show a candle to being widely used of compression spring brace type float collar float shoe.
Three, summary of the invention
The objective of the invention is: the float collar float shoe that a kind of magnetic force reduction type is provided.The method that possesses skills advanced person, compact conformation are reasonable, high temperature resistant, high pressure resistant, erosion resistance, antiacid alkali, oil resistant, anti-sulphur, shock resistance, and area of passage is big, flow resistance is little, and antiwind ability is strong, and drillability can the high characteristics of good, reverse sealing reliability.Applicable to all kinds of well cementing operations under the current known various complex conditions.
Technical scheme of the present invention is: the good characteristic of applied magnetic material, and in conjunction with current international and domestic high-molecular special engineering material new feature and cementing technology primary demand and form a kind of float collar float shoe by the magnetic force reduction type sealed valve core.Comprise body, magnet steel, ball seat, magnetic strength ball, sealing ring, guide cylinder and local derviation ring etc.Wherein, Constituted relatively independent magnetic force reduction type single current spool by magnet steel, ball seat, magnetic strength ball, sealing ring, guide cylinder and local derviation ring etc.; Between spool and body, can be fixed with the casting of gelling chemical materials such as special cement, also can use packing as seal; Spool is fixed on stops the step position on the body accordingly, form the finished product of magnetic force float collar float shoe.And its spool is magnet steel, ball seat, guide cylinder and local derviation ring from top to bottom successively.Form a Unbolcked type cavity by ball seat, guide cylinder and local derviation ring.This cavity ball seat end entrance is less, and middle guide cylinder position is maximum, and the outlet of lower end local derviation ring position is bigger, is the axial passage of a Pear-Shaped.In the local derviation ring of lower end, be furnished with asymmetric gusset, gusset look internal diameter less than magnetic strength ball external diameter.The magnetic strength ball places in this cavity, and its external diameter is looked internal diameter greater than the gusset of ball seat end entrance internal diameter and port of export local derviation ring, thereby its scope of activities also only limits in this cavity.Guide cylinder and local derviation ring also can unite two into one, and process one.Between ball seat and guide cylinder, be provided with sealing ring, can connect with magnetic strength ball the first half surface and cooperate ball seat to play the auxiliary seal effect.Magnet steel is made by the permanent magnetism material, is arranged on the upper seat of this cavity, also can incorporate among ball seat.The magnetic strength ball also is the ball sealer as valve body, adds magnetic conductive substance by the high-quality base material and makes, and can magnetic conduction substance be mixed in the spheroid base material on the technology, also can place spheroid or other technology modes to incorporate among the spheroid by magnetic conduction powder core.The magnetic strength ball is positioned at this cavity, receives the magnet steel suction, remains adhesive trend and falls to being seated among the ball seat.Operating principle of the present invention is: generally, the magnetic strength ball receives the magnetic attraction effect of magnet steel, is attracted to remain in the ball seat, and the normally closed sealing state at ball seat and sealing ring place realization float collar float shoe stops reverse fluid flow; When pump priming mud or circulating mud operation, fluid overcomes the magnetic attraction of magnet steel and washes the magnetic strength ball open and set up circulation; The magnetic strength ball of this moment receives the acting in conjunction of downward fluid impact power, self gravitation and buoyancy that makes progress and magnet steel magnetic attraction, just in the cavity that is formed by ball seat, guide cylinder and local derviation ring, is in dynamic floating state; When the pump speed increase, discharge capacity strengthens, and when impact force increases, the magnetic strength ball will continue descending, and is relied on one side by the guiding of the gusset of local derviation ring, makes direct flow channels more unimpeded, and flow resistance is littler, and effectively avoids the obstruction of impurity in the fluid; Annotate or circulation time when termination of pumping stops pump, the magnetic strength ball no longer receives the impact force of fluid, under the stronger magnetic attraction effect of buoyancy, reflux fluid viscous force and magnet steel, overcomes gravity, revert to the ball seat position rapidly, realizes oppositely closing and sealing.So go round and begin again, just reached the float collar float shoe and prevented the purpose that the cement paste fluid flows backwards.
It is a kind of brand-new technology method that the magnetic force that the present invention proposes first resets, and this magnetic force ball-and-seat cored structure that resets is a brand-new structure.The float collar float shoe of this new structure can be removed the inner complicated annex accessory of conventional springs elastic reset float collar float shoe from; Thereby its area of passage of float collar float shoe of this magnetic force resetting structure is bigger; Fluid flowing in the float collar float shoe is more unobstructed, and sealing performance is more reliable.
The magnetic force that the present invention the addresses technological new method single current spool that resets can promote being applicable to that all fluids need prevent the reverse situation that flows backwards and flow in any pipeline.And for the float collar float shoe that is used in the well cementation casing string pipeline, below also having some but be not limited only to these basic demand.
Body: be a cylindrical shape steel body.Generally be not less than casing grade, its collapsoing strength internal pressure strength is not less than adjacent casing in the casing string.External diameter is not more than respective sleeve box cupling diameter; Internal thread is arranged at top, in the tube of middle part installation step is arranged, and inner minimum diameter has external screw thread greater than respective sleeve float collar bottom, and external surface and all screw threads should be done anticorrosion (or phosphatization) and handle, and the float shoe bottom is a guide shoe.
Magnet steel: be a permanent magnet.Generally, process through technologies such as sintering, bonding or injection mouldings by the permanent-magnet material that comprises rare earth alloy such as rubidium iron boron, SmCo or ferrite and so on.Its Curie point is greater than 38～400 degrees centigrade, and the general work temperature is normal temperature to 100～150 degree centigrade, reaches as high as more than 200 degrees centigrade.Its distribution of shapes can be an annular, also can be circular, square, bar shaped, column, needle-like and other shapes; Can be multilayer stack adult, also can be the separate magnets of some suitable distributions.Requirement should have higher residual magnetic flux density, coercivity, HCJ and maximum magnetic energy product.
Ball seat: be a ball face sealing seat, in be through hole.Generally have a chemical stabilization with what high performance synthetic high polymer special engineering plastics such as PEEK, PPS were made, not corrosion, wear-resisting, self-lubricity good, the characteristics of good impact resistance, heatproof good corrosion resistance (heatproof that has can reach more than 240 degrees centigrade).The making of ball seat also can directly use a kind of synthesized polymer material from carrying magnetic injection molded, or magnet steel is inserted ball seat, and magnet steel and ball seat are united two into one.
Magnetic strength ball: be designed to spheroid in shape,, also more be prone to the guiding playback to protect its sealing respectively to evenly.Its material is the basis with the special engineering plastics material of PES, PEI and so on light-high-strength; Mixing a certain proportion of magnetic conduction substance like iron powder and so on is made; The magnetic conductivity object that also can in ball, insert ferrocart core and so on is made through methods such as injection mouldings; Or adding magnetic conduction substance with other materials, its external surface also can line with rubber.The magnetic strength ball is satisfying under the intensity and toughness prerequisite, and its apparent density should suitably reduce, require heatproof, wear-resisting, corrosion resistance good, impact resistance is strong, self-lubricity is good, good springiness, chemical property is stable, indeformable not corrosion.
Sealing ring: material can be a rubber, can be plastic cement and plastics, also can be metal or other nonmetals.Requirement can be born 100～150 degrees centigrade, even high temperature more than 240 degrees centigrade; Acidproof alkaline-resisting oil resistant of ability and anti-sulphur are anticorrosion.Cross sectional shape can be the O type, also can be V-type or other shapes.
Guide cylinder is the macromolecular material cylinder of a band portion inner conical surface, and its effect one is the inner chamber that forms spool, holds the magnetic strength ball; The 2nd, guiding magnetic strength ball can successfully return ball seat naturally when receiving magnet steel suction.
The local derviation ring is the bowl shaped structure of band inclined-plane deflection gusset in, and centre be through hole greatly directly, and gusset asymmetric order in inclined-plane is arranged in it, radially joins formation hollow and discontinuous " interior circle " makes runner not have continuous obstacle relatively and not; " interior circle " internal diameter that gusset is formed comes off to prevent that the magnetic strength ball is hit suitably less than magnetic strength ball external diameter.When circulating mud or cementing, gusset will be guided to naturally by the magnetic strength ball that fluid sweeps away and depart from float collar float shoe axial line position, and eccentric throw is more than 1 millimeter.The magnetic strength ball of secundly has reserved more major path for the direct overcurrent of fluid, has reduced resistance and has prevented that the impurity in the fluid from obstructing.
Adhesive bond: be the combination between spool and body, fixed with the casting of gelling chemical materials such as cement is main, also can stop that the mode that is aided with packing_seal disposes with step.
That above all material all has is high temperature resistant, high pressure resistant, erosion resistance, antiacid alkali, oil resistant, anti-sulphur, shock resistance characteristic.External except that this, be nonmetals or unstructuredness metal material, the drilling out work after helping cementing the well.
Four, description of drawings
Accompanying drawing 1 is the structural representation of magnetic force float collar.Among the figure, 1-body, 2-magnet steel, 3-ball seat, 4-magnetic strength ball, 5-sealing ring, 6-guide cylinder, 7-local derviation ring, 8-adhesive bond
Five, the specific embodiment
For further disclosing technical scheme of the present invention, further describe through embodiment below in conjunction with Figure of description.But the present invention does not receive the restriction of following embodiment, can confirm concrete embodiment according to technical scheme of the present invention and actual conditions.
Upper and lower in according to the invention, flowing with fluid in the pipeline from up to down is order.
The magnetic force float collar of structure as shown in Figure 1, its magnet steel 2 are on ball seat 3, and magnetic strength ball 4 is under ball seat 3, and ball seat 3 is between magnet steel 2 and magnetic strength ball 4, and magnet steel 2 is inhaled magnetic strength ball 4 toward ball seat 2 through magnetic attraction all the time, makes the float collar float shoe keep normally off.Ball seat 3 is last, and sealing ring 5 is under ball seat, and magnetic strength ball 4 the first half surface contacts with sealing ring 5 appropriateness, is main with ball face sealing, realizes the sealing of float collar float shoe with the auxilliary mode of being sealed into of sealing ring 5.Form with the special cement casting between body 1 and the magnetic force spool.
Structural representation by magnetic force float collar shown in Figure 1 is visible: under normal conditions; Magnetic strength ball 4 receives the magneticaction of magnet steel 2; Be attracted and get back to ball seat 3,, play the effect that prevents that cement paste from flowing backwards in the normally closed sealing state of ball seat 3 with sealing ring 5 places realization float collar float shoe; When pump priming mud or circulating mud, fluid will overcome the magnetic attraction of magnet steel 2 and wash magnetic strength ball 4 open and set up circulation; The magnetic strength ball 4 of this moment just is in dynamic balance state in the cavity that is formed by ball seat 3, guide cylinder 6 and local derviation ring 7; When impact force is big; Also can be directed at a side by the rib of local derviation ring 7; The passage that fluid is directly flow through is bigger, and flow resistance is littler, and can reduce the probability that impurity obstructs in the fluid; In case and termination of pumping stops circulation time, magnetic strength ball 4 no longer receives the impact force of fluid and under the magnetic attraction effect of magnet steel 2, gets back to ball seat 3 positions rapidly, realizes oppositely closing and sealing.So go round and begin again, just reached the float collar float shoe and prevented the purpose that flows backwards.
Claims (10)
1. magnetic force float collar float shoe is characterized in that comprising body and with the magnetic force of compositions such as magnet steel, ball seat, magnetic strength ball, sealing ring, guide cylinder, the local derviation ring single current spool that resets.
2. magnetic force float collar float shoe according to claim 1 adopts the technological new method that is reset to essential characteristic with magnetic force first.
3. according to the magnetic force of the said magnetic force float collar of the claim 1 float shoe single current spool that resets, be suitable for all kinds of fluids one-way flow situation that magnetic force resets in various cross sectional shape tube passages.
4. magnetic force float collar float shoe according to claim 1, valve body is the magnetic strength ball of spheroidal, places in the chamber that is made up of ball seat, guide cylinder, local derviation ring, can in the chamber, move about, longshore current rotation axis adhesive to the ball seat that makes progress can be realized oppositely closing and sealing.
5. magnetic force float collar float shoe according to claim 1, last, the magnetic strength ball is following with magnet steel, and the relative position of ball seat face between magnet steel and magnetic strength ball disposes.
6. magnetic force float collar float shoe according to claim 1, ball seat are a ball face sealing seat, in be through hole.With ball face sealing is main, and sealing ring contacts with the first half surface of magnetic strength ball, realizes auxiliary seal.
7. magnetic force float collar float shoe according to claim 1; The local derviation ring is the bowl shaped structure of the eccentric gusset in an interior band inclined-plane, and the centre is a big footpath through hole, and the inclined-plane gusset is asymmetricly arranged in it in proper order; Radially join relatively and not, form hollow and discontinuous " interior circle "; " interior circle " internal diameter is suitably less than magnetic strength ball external diameter; The center of circle of " interior circle " and float collar float shoe axial line offset distance are more than 1 millimeter.
8. magnetic force float collar float shoe according to claim 1, used magnet steel generally by the magnetic material that comprises rare earth alloy, ferrites and so on such as rubidium iron boron, SmCo, is processed through technologies such as sintering, bonding or injection mouldings, and Curie point is more than 38 to 400 degrees centigrade.
9. magnetic force float collar float shoe according to claim 1, its magnetic strength ball is formed by the permeability magnetic material of inserting in the non-metallic base material or incorporate the ferrocart core and so on of certain deal.
10. magnetic force float collar float shoe according to claim 1, inner each part is the strong material of drillability such as high-molecular special engineering plastics, magnetic conduction powder core, rare earth alloy and gum material entirely.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101342163A CN102787826A (en) | 2011-05-15 | 2011-05-15 | Magnetic float collar float shoe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101342163A CN102787826A (en) | 2011-05-15 | 2011-05-15 | Magnetic float collar float shoe |
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| CN102787826A true CN102787826A (en) | 2012-11-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011101342163A Pending CN102787826A (en) | 2011-05-15 | 2011-05-15 | Magnetic float collar float shoe |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108868683A (en) * | 2018-09-10 | 2018-11-23 | 张玉森 | The disconnected de- automatic well-packer of pumping well polish rod |
| CN111963113A (en) * | 2019-05-20 | 2020-11-20 | 思达斯易能源技术(集团) 有限公司 | Automatic inflow control current limiter, inflow control device and water control tubular column |
| CN115324499A (en) * | 2022-10-14 | 2022-11-11 | 东营市源鑫石油科技有限公司 | Automatic grouting floating shoe device for oil well construction |
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| CN201090174Y (en) * | 2007-10-17 | 2008-07-23 | 吉林石油集团有限责任公司 | Steel body sealing float collar and float shoe for oil field well-cementing |
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| CN1111735A (en) * | 1994-05-16 | 1995-11-15 | 唐山龙加电子技术开发有限公司 | WK splitter |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108868683A (en) * | 2018-09-10 | 2018-11-23 | 张玉森 | The disconnected de- automatic well-packer of pumping well polish rod |
| CN111963113A (en) * | 2019-05-20 | 2020-11-20 | 思达斯易能源技术(集团) 有限公司 | Automatic inflow control current limiter, inflow control device and water control tubular column |
| CN111963113B (en) * | 2019-05-20 | 2024-05-17 | 思达斯易能源技术(集团)有限公司 | Automatic inflow control flow restrictor, inflow control device and water control pipe column |
| CN115324499A (en) * | 2022-10-14 | 2022-11-11 | 东营市源鑫石油科技有限公司 | Automatic grouting floating shoe device for oil well construction |
| CN115324499B (en) * | 2022-10-14 | 2022-12-23 | 东营市源鑫石油科技有限公司 | Automatic grouting floating shoe device for oil well construction |
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Application publication date: 20121121 |