CN206174920U - A single current valve and bridging plug for bridging plug - Google Patents

Abstract

The utility model discloses a single current valve and bridging plug for bridging plug relates to engineering machine tool technical field. The problem of prior art exist the relatively poor technique of the suitability of different job sites is solved. Should be used for the single current valve of bridging plug, and including the shutoff body and guard ring, form to dismantle between guard ring and the release sub and be connected, and the central through hole of guard ring and release sub's internal fluid channel is linked together, the shutoff body stops up on the inner wall of guard ring, and can follow the internal fluid channel that the orientation that deviates from the stratum export flowed into release sub in order to hinder the flow stopping body through the central through hole of guard ring with the central through hole shutoff of guard ring. The utility model is used for improve the suitability of bridging plug to different job sites.

Description

For the ball-and-seat and bridging plug of bridging plug

Technical field

The utility model is related to technical field of engineering machinery, more particularly to a kind of for the ball-and-seat of bridging plug and using this The bridging plug of ball-and-seat.

Background technology

During the exploration and development in oil field, due to oil, gas and water well payzone because formation testing by layer, layering section pressure break or point The technologies such as interval pilot production need, it is necessary to take a kind of temporary blocking technique, current production layer closure are fallen, cut-out production layer Flow channel in pit shaft, in order to after the completion of to other payzone implementing process measures, treating technique, then releases temporary plugging, The flow channel of production layer and pit shaft is set up, is realized to oil, the oil recovery of gas well, gas production production.Due to bridge plugging be at present most Cost-effective pit shaft plugging technology, is also that range of application is wider in wellbore operations, measures to reform and in formation testing pilot production technology Process, is one of most widely used technique in exploration and development production process in oil field.But, applicants have discovered that existing At least there is following technical problem in the bridging plug as shown in Figure 1 that technology is provided：

One is to set problem influence halfway normally to use, whether the product of external product and the country, because bridging plug send Enter instrument and bridging plug to give up the free movement situation of setting, midway easily occur during bridging plug feeding sets problem, once There is midway and set problem, it is necessary to reclaimed or bored except treatment, influence duration and cost；

Two is that to reclaim or bore plug high cost, difficulty big, bore and limited by condition in pit shaft during plug (such as sand setting, junk, Side-wall begriming etc.) so that bore and fill in more difficult, it is necessary to carry out other technique advanced processing pit shafts, cause construction cost increase, Serious also results in the appearance of pit shaft complex situations, influences the normal production of Oil/gas Well；Meanwhile, during plug is bored, whether Bridging plug can be bored or composite easily bores bridging plug, one side bridging plug is bored except Surface power drive system is needed in itself, and construction cost is high, together The slips of Shi Qiaosai itself is manufactured using high intensity material, bores mill performance extreme difference, and as the maximum difficult point for boring plug, slip segment also holds Easily formed and bore plug tubing string chance card problem, the whole cost for boring plug technique is significantly increased；

Three be current bridging plug exist it is setting after cannot be according to ball-and-seat be adjusted the need for job site, this is bridging plug packing element There is leakage channel with the borehole wall, bridging plug loses the effect of closure, and its consequence is fracturing fluid whereabouts unknown, causes serious waste；

Four is that bridge plug seat is honored as a queen that grappling is unreliable, and bridging plug is descending during pressure break, causes layering to fail, and has a strong impact on separate stratum fracfturing Construction quality；

Five is that the cage of bridging plug can not be adjusted at the construction field (site), is made troubles to pressing crack construction；

Six is the elastic packing cylinder that bridging plug is made of degradable rubber and degradable polymeric material, but degradable rubber With degradable polymeric material not heatproof, it is impossible to be satisfied with the applied environment of high compressive strength；With industrial production and daily life Among degraded paper, degradative plastics and imitative metal degradation material make bridging plug, due to these materials itself exist range of application and Condition is limited, and intensity is mostly very low, can only achieve the intensity of ordinary carbon steel metal material 30-40%, this kind of bridge of material manufacture Plug is in filed application, it is impossible to be satisfied with the applied environment of high compressive strength.

Utility model content

At least one purpose of the present utility model is to propose a kind of ball-and-seat for bridging plug and using the ball-and-seat Bridging plug, solves prior art in the presence of the poor technical problem of applicability to different job sites.It is all that the utility model is provided (plugging effect is lasting, stabilization, grappling reliability for many technique effects that optimal technical scheme in many technical schemes can be generated It is good, be not in that midway sets problem, need not bore plug, easy construction etc.) elaboration as detailed below.

To achieve the above object, the utility model provides following technical scheme：

The ball-and-seat for bridging plug that the utility model is provided, including occluding body and guard ring, wherein：

Formed between the guard ring and back-off sub and be detachably connected, and the central through hole of the guard ring is lost with described The internal fluid channels of hand joint are connected；The occluding body is blocked on the inwall of the guard ring, and can be by the protection The central through hole closure of circle flows into institute with the central through hole for preventing fluid from passing through the guard ring along the direction exported away from stratum State the internal fluid channels of back-off sub.

The optimization of technical scheme after any technical scheme provided above or hereinafter as the utility model or any optimization, The guard ring is made up of degradation material or corrodible material, and its degradation resistant or decay resistance are better than described giving up and connect Head.

The optimization of technical scheme after any technical scheme provided above or hereinafter as the utility model or any optimization, The internal diameter size of the guard ring is gradually reduced towards away from the direction of stratum outlet.

The optimization of technical scheme after any technical scheme provided above or hereinafter as the utility model or any optimization, The inner and outer wall of the guard ring is the conical surface or curved surface.

The optimization of technical scheme after any technical scheme provided above or hereinafter as the utility model or any optimization, Formed by anticreep circle between the guard ring and back-off sub and be detachably connected, the anti-knocking over is removable with the back-off sub Unload connection and the position of the guard ring can be locked and can prevent the occluding body from departing from from the guard ring.

The optimization of technical scheme after any technical scheme provided above or hereinafter as the utility model or any optimization, It is provided with stop bit flange on the inwall of the anti-knocking over, the stop bit flange is pressed on the guard ring with by the guard ring It is locked in the position being resisted against in the external port of the back-off sub；Or, both the anti-knocking over and described guard ring are one Body formula structure or both is fixedly connected.

The optimization of technical scheme after any technical scheme provided above or hereinafter as the utility model or any optimization, Be provided with anticreep flange or anti-break pin in the anti-knocking over, the anticreep flange or anti-break pin can prevent the occluding body from The external port of the back-off sub departs from.

The optimization of technical scheme after any technical scheme provided above or hereinafter as the utility model or any optimization, The anti-knocking over, the occluding body are degradation material or corrodible material is made.

The bridging plug that the utility model is provided, including being used for of providing of back-off sub and any technical scheme of the utility model The ball-and-seat of bridging plug.

The optimization of technical scheme after any technical scheme provided above or hereinafter as the utility model or any optimization, The first corrodible material or the second corrodible material are partly or entirely used in the parts of the bridging plug, wherein：

The performance of the first corrodible material meets following condition：

Compressive strength is more than 400MPa at room temperature, and corrosion rate is more than in 70 DEG C and 0.5% Klorvess Liquid 0.2mg/cm²·hr；And/or,

The performance of the second corrodible material meets following condition：Compressive strength is more than 320MPa at room temperature, 70 DEG C of KCE content be 0.5% solution in corrosion rate be more than 0.1mg/cm²·hr。

Based on above-mentioned technical proposal, the utility model embodiment can at least produce following technique effect：

Guard ring in the utility model in ball-and-seat is arranged at the external port of the back-off sub of bridging plug, and is formd and lost The safeguard structure of the external port of hand joint, guard ring can play protective action to ball-and-seat, can extend the outer of back-off sub The useful effect duration of port ball-and-seat, is detachably connected due to being formed (by anti-knocking over) between guard ring and back-off sub Connect, it is possible thereby to according to thickness difference or the different guard ring of degradation rate are equipped with, changed the need for job site, to realize adjusting The purpose of whole ball-and-seat effective time, asks the poor technology of applicability of different job sites so solving prior art and existing Topic.

Further, the preferred technical scheme in many technical schemes of the utility model is also to the cage structure at ball-and-seat Improvement has been made, this reality thus can have more effectively been improve according to suitable cage is changed the need for different job sites With new applicability (this puts and will be explained below).

In addition, it is necessary to it is emphasised that：Optimal technical scheme in many technical schemes that the utility model is provided can be produced (plugging effect is lasting, stabilization, grappling good reliability, is not in that midway sets problem, need not bore for raw many technique effects Plug, easy construction, pressing crack construction quality are high etc.) elaboration as detailed below.

Brief description of the drawings

Accompanying drawing described herein is used for providing being further understood to of the present utility model, constitutes the part of the application, Schematic description and description of the present utility model is used to explain the utility model, does not constitute to of the present utility model improper Limit.In the accompanying drawings：

Fig. 1 is the schematic diagram of the bridging plug for providing in the prior art；

The schematic diagram of the bridging plug that Fig. 2 is provided by the utility model embodiment；

The section view of the first annular body of reducing support ring is illustrated in the bridging plug that Fig. 3 is provided by the utility model embodiment Figure；

A kind of first annular body and second in the bridging plug that Fig. 4 is provided by the utility model embodiment in reducing support ring Schematic cross-sectional view when annular solid is mutually superimposed；

First annular body in the bridging plug that Fig. 5 is provided by the utility model embodiment in another reducing support ring and the Schematic cross-sectional view when second ring body is mutually superimposed；

The pressure ring of linear pattern groove is provided with the bridging plug that Fig. 6 is provided by the utility model embodiment and sector is provided with The contrast schematic diagram of the pressure ring of groove；

The section view that the pressure ring of linear pattern groove is provided with the bridging plug that Fig. 7 is provided by the utility model embodiment is illustrated Figure；

The slips that teeth pedestal is collectively constituted with grappling teeth in the bridging plug that Fig. 8 is provided by the utility model embodiment Schematic front view；

Fig. 9 is the schematic top plan view of slips shown in Fig. 8；

Figure 10 is the elevational schematic view of slips shown in Fig. 8；

Along axle after eight teeth pedestals and two hoops are assembled in the bridging plug that Figure 11 is provided by the utility model embodiment To schematic diagram when upper (court leads to the direction in shaft bottom) down viewing；

Along axle after eight teeth pedestals and two hoops are assembled in the bridging plug that Figure 12 is provided by the utility model embodiment To the schematic diagram under upward (towards the direction for leading to well head) during viewing；

Formed both when anti-knocking over carries out spacing to guard ring in the bridging plug that Figure 13 is provided by the utility model embodiment Assembly schematic cross-sectional view；

Both when anti-knocking over carries out spacing to guard ring in the bridging plug that Figure 14 is provided by the utility model embodiment with lose The partial schematic sectional view of the assembly that hand joint is collectively forming；

Reference：1st, pressure ring (being located at upstream)；2nd, hoop；3rd, grappling teeth；31st, the bottom surface of grappling teeth；4th, teeth Pedestal；5th, first annular body；6th, the second annular solid (belonging to reducing support ring)；7th, degradable elasticity sealing drum；8th, the second ring Body (belongs to lower reducing support ring)；9th, slips present a theatrical performance as the last item on a programme (or：Slips body)；10th, pressure ring (being located at downstream)；101st, groove； 102nd, it is domatic；103rd, lozenges；11st, anti-break pin；12nd, anti-knocking over；121st, stop bit flange；13rd, occluding body；14th, guard ring； 15th, back-off sub (position of label sign is the part that it is exported close to stratum)；161st, first face is set；162nd, second set Face；17th, downstream supporter.

Specific embodiment

Accompanying drawing Fig. 1~Figure 14 is referred to below and word content understands that content of the present utility model and this practicality are new Distinctive points between type and prior art.Hereafter pass through accompanying drawing and enumerate the side of some alternative embodiments of the present utility model Formula, is described in further detail to the technical solution of the utility model (including optimal technical scheme).It should be noted that：This During any technical characteristic, any technical scheme in embodiment are the technical characteristic or optional technical scheme of plurality of optional One or more, in order to describe it is succinct the need for cannot exhaustive all alternative technical characteristics of the present utility model in presents And alternative technical scheme, the implementation method for being also not easy to each technical characteristic emphasizes that it is optional various embodiment party One of formula, so those skilled in the art should know：Any technological means that the utility model is provided can be replaced Or any two or more the technological means that provides the utility model or technical characteristic are combined mutually and obtain new Technical scheme.Any technical characteristic and any technical scheme in the present embodiment do not limit protection model of the present utility model Enclose, protection domain of the present utility model should not pay that creative work institute is thinkable any to be replaced including those skilled in the art Any two that generation technique scheme and those skilled in the art provide the utility model or more technological means or technology Feature technical scheme new obtained from being combined mutually.

It is a kind of lasting, stable with plugging effect that the utility model embodiment is provided, and grappling good reliability is not in Midway sets problem, the ball-and-seat for bridging plug without boring the advantages of plug, easy construction and the bridging plug using the ball-and-seat.

The technical scheme that the utility model is provided is illustrated in more detail with reference to Fig. 1~Figure 14.

As shown in Fig. 2~Figure 14, the ball-and-seat for bridging plug that the utility model embodiment is provided, including occluding body (preferably spheroid, is properly termed as ball sealer when being spheroid) 13 and guard ring 14, wherein：

Formed between guard ring 14 and back-off sub 15 and be detachably connected, guard ring 14 is arranged on the back-off sub 15 of bridging plug External port at；And the central through hole of guard ring 14 is connected with the internal fluid channels of back-off sub 15；Occluding body 13 is blocked On the inwall of guard ring 14, and the central through hole of guard ring 14 can be blocked to prevent fluid from leading to by the center of guard ring 14 Hole flows into the internal fluid channels of back-off sub 15 along the direction exported away from stratum.

Guard ring 14 in the utility model in ball-and-seat is arranged at the external port of back-off sub 15 of bridging plug, and is formed The safeguard structure of the external port of back-off sub 15, guard ring 14 can play protective action, can extend and give up to ball-and-seat The useful effect duration of ball-and-seat at the external port of joint 15, due between guard ring 14 and back-off sub 15 (by anti-knocking over) Formation is detachably connected, it is possible thereby to that thickness is different or degradation rate is different is anti-according to being equipped with the need for job site, being changed Guard ring 14, to realize adjusting the purpose of ball-and-seat dissolving or degradation speed and effective time.Optionally implementation method, prevents The degradation resistant or decay resistance of guard ring 14 are better than back-off sub 15.Now, guard ring 14 can be to the outer end of back-off sub 15 Mouth plays more preferable protective action, and then the more effectively degraded of the external port of extension back-off sub 15 or corrosion rate, improves The reliability of ball-and-seat.Degradation resistant or the stronger guard ring 14 of decay resistance then can more save the material of back-off sub 15, have Beneficial to reduces cost.

Optionally implementation method, the internal diameter size of guard ring 14 is gradually reduced towards away from the direction of stratum outlet.Should The guard ring 14 of structure is more adapted to the shape of the external port of back-off sub 15, and stress is more uniformly distributed guard ring 14 everywhere.

Optionally implementation method, the inner and outer wall of guard ring 14 is the conical surface or curved surface (such as cambered surface), preferably It is the conical surface.The conical surface or curve form rule, are easy to batch machining, manufacture.

Optionally implementation method, Detachable connection structure includes anti-knocking over 12, and anti-knocking over 12 can with back-off sub 15 Dismounting connects (be preferably threadedly coupled) and can lock the position of guard ring 14 and can prevent occluding body 13 from being taken off from guard ring 14 From.Anti- knocking over 12 can play a part of locking, spacing, anticreep to guard ring 14, and anticreep effect can be played to occluding body 13.

Optionally implementation method, is provided with stop bit flange 121 on the inwall of anti-knocking over 12, and stop bit flange 121 is compressed In on guard ring 14 so that guard ring 14 to be locked in the position being resisted against in the external port of back-off sub 15；Or, anti-knocking over 12 Both are that integral type structure or both is fixedly connected with guard ring 14.Said structure easy disassembly, and compact conformation.

Optionally implementation method, anticreep flange is provided with anti-knocking over 12, and (anticreep flange is specifically as follows anti-knocking over The inwall of convex shoulder or groove 101 on 12 inwalls is formed, or the blocker ring being detachably connected with anti-knocking over 12) or anticreep Bearing pin, anticreep flange or anti-break pin can prevent occluding body 13 from departing from from the external port of back-off sub 15.Anticreep flange or anticreep Bearing pin 11 can play a part of spacing, anticreep to occluding body 13.Anti-break pin 11 can be collectively forming prevention with anti-knocking over 12 The cage structure that ball sealer is dropped out.

Optionally implementation method, anti-knocking over 12, occluding body 13 are degradation material or corrodible material is made.It is anti- After knocking over 12, occluding body 13 are degraded or be corrodible, ball-and-seat can be failed, and oil extraction operation just can be implemented afterwards.

Optionally implementation method, partly or entirely can using the first corrodible material or second in the parts of bridging plug Corrosion material, wherein：

The performance of the first corrodible material meets following condition：

Compressive strength is more than 400MPa at room temperature；Corrosion rate is more than in 70 DEG C and 0.5% Klorvess Liquid 0.2mg/cm²·hr；And/or,

The performance of the second corrodible material meets following condition：Compressive strength is more than 320MPa at room temperature；At 70 DEG C KCE content be 0.5% solution in corrosion rate be more than 0.1mg/cm²·hr。

Testing proves in oil and gas reservoir pressure break and oil-gas mining, the degraded of above-mentioned reducing support ring manufacture material, corrosion The need for performance and intensity, hardness performance can be preferably met to the sleeve pipe where most of stratum and bridging plug.Certainly, Those skilled in the art's intensity of sleeve pipe that can also according to actual needs where the condition and bridging plug on the stratum of pressure break and hard Degree performance is suitably changed to the performance of the material of reducing support ring.

Structure the utility model at ball-and-seat has three kinds of forms：

First, back-off sub 15 is not provided with guard ring 14, anti-knocking over 12 using degraded or the relatively slow material of corrosion rate On be not provided with anti-break pin 11 anticreep flange be only set；

2nd, back-off sub 15 sets degraded or corrosion rate is relative using degraded or the comparatively faster material of corrosion rate Guard ring 14 prepared by slower material, but anti-break pin 11 is not provided with anti-knocking over 12；

3rd, back-off sub 15 sets degraded or corrosion rate is relative using degraded or the comparatively faster material of corrosion rate Anti-break pin 11 is also provided with the guard ring 14 of slower material preparation and anti-knocking over 12.

Optionally implementation method, partly or entirely can using the first corrodible material or second in the parts of bridging plug Corrosion material,

The bridging plug that the utility model is provided, including the use that back-off sub 15 and any technical scheme of the utility model are provided In the ball-and-seat of bridging plug.Bridging plug suitably uses the ball-and-seat that the utility model is provided to be fitted to different job sites to improve bridging plug Should be able to power.

Optionally implementation method, bridging plug is also presented a theatrical performance as the last item on a programme 9 and reducing support including degradable elasticity sealing drum 7, slips Ring, wherein:Reducing support ring, including annular solid and be arranged on annular solid peripheral outer wall or end face and set face (preferably Face 161 is set including first and second set face 162), annular solid can profit after compressive deformation under the extruding force effect of axial direction With set face abut, set on the internal surface of sleeve pipe where bridging plug and with inwall (conditions permit can also be the borehole wall) shape of sleeve pipe It is tightly connected into face contact type.Annular solid include the annular solid 6 of first annular body 5 and second (or the second annular solid 8, hereafter with As a example by second annular solid 6), first annular body 5 is mutually superimposed with the second annular solid 6, wherein：

As shown in Figure 4 and Figure 5, first annular body 5 is provided with first and sets face 161, and the second annular solid 6 is provided with the second seat Both front cover 162, the annular solid 6 of first annular body 5 and second are common to be utilized under extruding forces effect of axial direction after compressive deformation Respective first sets face 161 and second sets face 162 and abuts, sets in the sleeve pipe where bridging plug that (conditions permit can also be The borehole wall) on inwall and form face contact type liquid with the inwall of sleeve pipe and be tightly connected.

The number of reducing support ring is two, and degradable elasticity sealing drum 7, slips is presented a theatrical performance as the last item on a programme 9 and the support of two reducings Ring is set in back-off sub 15；

Degradable elasticity sealing drum 7 is between two reducing support rings；

Reducing support ring can slips present a theatrical performance as the last item on a programme 9 and degradable elasticity sealing drum 7 jointly apply axial compression power work Set under on the internal surface of sleeve pipe where bridging plug.

Both are total to be used for the annular solid 6 of first annular body 5 and second of the reducing support ring of bridging plug in it in the utility model Can set face abutting, set in the sleeve pipe where bridging plug using respective after compressive deformation with being acted in the extruding force of axial direction On inwall and form face contact type liquid with the inwall of sleeve pipe to be tightly connected, it is big that face contact type liquid is tightly connected not only contact area, Junction is less prone to problem of stress concentration, and structural reliability is strong, and liquid sealing effectiveness is even more ideal, stable.Bridging plug is suitable Using the reducing support ring of the utility model offer to improve its plugging effect and set performance, plugging effect is especially ensured that Persistently, stably.

Optionally implementation method, first sets face 161 and/or second sets face 162 in first annular body 5 and second It is the conical surface or cambered surface, the preferably conical surface before both annular solid 6 compressive deformations.The face that sets of the structure is set in the set where bridging plug When on inside pipe wall, its fitting area between internal surface of sleeve pipe is big, and surrounding is not likely to produce stress concentration, so having plugging effect Persistently, the effect of stabilization.

Optionally implementation method, the annular solid 6 of first annular body 5 and second is each sheathed on the degradable elasticity of bridging plug The section of sealing drum 7 is provided with least two gaps or at least two preset cracks, wherein:First annular body and the second annular solid After compressive deformation, preset cracks can split and form gap；The segment segregation is at least two circumferentially direction arrangements by gap Dichotomy, and first set face 161 and/or second set face 162 positioned at dichotomy peripheral outer wall on.Dichotomy It is elastic stronger, when setting, the region that it circumferentially sets between direction and internal surface of sleeve pipe is more homogeneous against power, sealing effectiveness It is even more ideal.

Optionally implementation method, the gap on gap or preset cracks and the second annular solid 6 on first annular body 5 Or preset cracks are mutually staggered in circumferential direction.When now can avoid degradable elasticity sealing drum 7 by pressure break, degradable bullet Property sealing drum 7 disintegrating slag infiltration and by reducing support ring.

Optionally implementation method, two phases of the position in the gap on first annular body 5 on the second annular solid 6 Centre position between adjacent gap in circumferential direction.The structure can more effectively avoid degradable elasticity sealing drum 7 During by pressure break, the disintegrating slag of degradable elasticity sealing drum 7 permeates and by reducing support ring.

Optionally implementation method, reducing support ring is made up of degradation material or corrodible material.Reducing support ring Voluntarily degraded or fast erosion corrosion, thereby eliminating brill plug technique after the completion of formation breakdown operation.In addition, just in case setting mistake Lose, it is also possible to reducing support ring is set new bridging plug again after voluntarily degrading or corroding, so easy construction.

Optionally implementation method, on first annular body 5 first sets second on the annular solid 6 of face 161 and second Set face 162 both are concordant, set when on the internal surface of sleeve pipe where bridging plug, in the axial direction both mutual flushes, continuous Distribution.Now set, sealing effectiveness it is even more ideal.

Optionally implementation method, the ductility of reducing support ring is more than 5%.The ductility of reducing support ring is preferably big In 7%.Now reducing support ring resilience is relatively good, is hardly damaged, set, the persistence of sealing effectiveness it is even more ideal.

Optionally implementation method, the material composition of reducing support ring is：Mg：2~7.8wt%, Cu：0.01~ 4wt%, Sn：0.01~2wt%, Zn：0.01~9wt%, Ga：0.1~4.5wt%, Mn：0.01~1wt%, In：0.1~ 4.5wt%, Fe：0.01~3wt%, balance of Al, each component weight percent sum are 100wt%.Above-mentioned material composition proportion The reducing support ring degraded that is made, corrosive nature and intensity, hardness performance can preferably meet oil and gas reservoir pressure break and The demand of oil-gas mining.Certainly, material composition proportioning disclosed above is only the preferred cost proportioning of the utility model, this area Technical staff can also be modified to the percentage by weight of its part or all of element and element.Meanwhile, above-mentioned material Can apply to manufacture the parts of other bridging plugs outside reducing support ring.

Optionally implementation method, the reducing support ring for bridging plug also includes at least one the 3rd annular solids, the 3rd Annular solid is mutually superimposed with the annular solid 6 of first annular body 5 or second, wherein：

The 3rd is provided with the peripheral outer wall or end face of the 3rd annular solid and sets face, first annular body 5, the second annular solid 6 And the 3rd annular solid it is common under the extruding force effect of axial direction after compressive deformation can using respective first set face 161, Second sets face 162 and the 3rd sets face and abuts, sets and formed on the internal surface of sleeve pipe where bridging plug and with the inwall of sleeve pipe Face contact type liquid is tightly connected.3rd annular solid can be set according to the actual requirement that sets, it is also possible to be not provided with, during setting its Number can as needed design one or more.

Optionally implementation method, it is plane that slips is presented a theatrical performance as the last item on a programme and the end face of reducing support ring is extruded on 9, and plane perpendicular to Reducing support ring axial direction, the peripheral outer wall of reducing support ring presents a theatrical performance as the last item on a programme 9 section close to slips and slips is presented a theatrical performance as the last item on a programme between 9 and existed The avoidance gap of annular strain is supported for accommodating reducing.

The structure helps to make reducing support ring realize effectively receiving in predetermined position using present a theatrical performance as the last item on a programme 9 extruding force of slips Compressive strain, it is to avoid it is excessive and damage, set problem loosely deformation occur, so can with it is more longlasting, stably set in sleeve pipe Interior action.

Optionally implementation method, the pressure ring as shown in Fig. 61 that bridging plug also includes being set in back-off sub 15 (or pressure Ring 10, hereafter by taking pressure ring 1 as an example), slip assemblies, wherein：Slip assemblies are presented a theatrical performance as the last item on a programme between 9 between pressure ring 1 and slips；

Slip assemblies include hoop 2 and at least two pieces slips, and hoop 2 is set in outside slips, between slips and pressure ring 1 Guide frame is provided with, when pressure ring 1 applies axial compressive force to slips, in the presence of guide frame, all of slips can begin Slide into the position of the internal surface of sleeve pipe where being anchored to bridging plug from the position near the axis of back-off sub 15 with the state of centering eventually Put.

Slips in slip assemblies is moved to anchor station with the state of centering from initial position all the time, thus ensure that anchor Fixed reliability.During pressure break bridging plug will not be descending, it is to avoid the problem of layering failure occurs, and then ensure that separate stratum fracfturing is constructed Quality is more satisfactory.

Optionally implementation method, is preferably between pressure ring 1 and back-off sub 15 and uses the adjustable screw thread of attachment force Structure is connected.Can certainly be connected using bearing pin.The adjustable helicitic texture applicability of attachment force is stronger, can basis Actual conditions are adjusted pressure ring 1 and are given up by way of the tooth number for changing the screw thread engaged between pressure ring 1 and back-off sub 15 The size of the attachment force between joint 15.When sending the heart axle of plug instrument to hold back-off sub 15, the outer barrel of plug instrument is sent downward When moving and applying pressure to pressure ring 1, the pressure can make the attachment structure between pressure ring 1 and back-off sub 15 fail, the connection Pressure ring 1 is descending after structural failure and applies axial compressive force to slips.

Optionally implementation method, it is upper (preferably that guide frame includes being arranged on slips and pressure ring 1 both one of them On slips, specifically on the teeth pedestal 4 of slips) lozenges as shown in Figure 8 103 and be arranged on slips and pressure ring 1 both Wherein another upper connected in star of straight line as shown in Figure 6 and Figure 7 101 (preferably on pressure ring 1), wherein：The bottom of straight line connected in star 101 Face is domatic 102, and lozenges 103 is abutted against with domatic 102 and relative can slided.Said structure make use of lozenges 103 and slope The position-limiting action of sliding capability and straight line connected in star 101 between face 102 in sliding process, ideally realizes slips group The alignment function of slips in part.The centring property of the straight line connected in star 101 is far superior to scalloped recess 101.

In the present embodiment as shown in Figure 8 and Figure 9 lozenges 103 with as shown in Figure 7 domatic 102 both be specifically as follows it is flat Face, or the mating surface structure (such as concave surface coordinates with convex surface, fold face and fold face coordinate) or guide rail for matching each other Structure.

As shown in Fig. 8~12, optionally implementation method, slips includes teeth pedestal 4 and grappling teeth 3, wherein： Slips is anchored on internal surface of sleeve pipe by grappling teeth 3；

Be provided with mounting groove on teeth pedestal 4, grappling teeth 3 be embedded in mounting groove and grappling teeth 3 bottom surface 31 and peace The bottom surface of tankage abuts against, and the bottom surface 31 of grappling teeth 3 will can bear along the axle of back-off sub 15 in the anchoring process of grappling teeth 3 The pressure along the radial direction of back-off sub 15 is partially converted into frictional force.

Bottom surface 31 in the structure due to grappling teeth 3 can clear up the outer surface of grappling teeth 3 by way of conversion At least part of axial friction for bearing, which thereby enhances the service life and functional reliability of grappling teeth 3.Grappling teeth 3 volumes are much smaller than teeth pedestal 4, and it is higher than teeth pedestal 4 that grappling teeth 3 are preferably hardness, and the material of grappling teeth 3 specifically can be with Using ceramics.After other parts of bridging plug thoroughly corrode or degrade, the structure of the ceramic particle that grappling teeth 3 can be to crush Form is fallen into sleeve pipe.

Optionally implementation method, the bottom surface 31 of grappling teeth 3 is plane or cambered surface, the center line or plane of cambered surface with There is acute angle or obtuse angle angle in the axis of back-off sub 15.The structure midplane or cambered surface are regular face, are easy to process, make Make and assemble, certainly, also should be in protection of the present utility model with the technical scheme of substitutive patterns or cambered surface using other curved surfaces Within the scope of.

Optionally implementation method, grappling teeth 3 are located on teeth pedestal 4 close to the position of pressure ring 1, and/or, grappling Teeth 3 gradually increase towards the direction thickness close to pressure ring 1.

Grappling teeth 3 are located on teeth pedestal 4 during close to the position of pressure ring 1, and teeth pedestal 4 is to the pressure of grappling teeth 3 area Duan Houdu is larger, and intensity is higher, so being favorably improved the service life and functional reliability of teeth pedestal 4.Grappling teeth 3 When gradually increasing towards the direction thickness close to pressure ring 1, help to improve the compressive property of grappling teeth 3, improve it and use Life-span and functional reliability.

Optionally implementation method, back-off sub 15, degradable elasticity sealing drum 7, pressure ring 1, hoop 2 and teeth base Seat 4 is degradation material or corrodible material is made.

With reducing support ring similarly, the parts of bridging plug remove small volume, understand fragmentation after the completion of formation breakdown operation When can voluntarily degrade or corrode outside grappling teeth 3, it is convenient to omit bore plug technique.In addition, just in case set failure, it is also possible to make The parts of bridging plug set new bridging plug again after voluntarily degrading or corroding, so easy construction.

Optionally implementation method, partly or entirely can using the first corrodible material or second in the parts of bridging plug Corrosion material, wherein：

The first corrodible material composition is：Al：5~10wt%, Zn：0.1~3wt%, Mn：0.01~1wt%, Sn:0.01~1wt%, Cu：0.05~5wt%, Pb：0.01~1.9wt%, Fe：0.01~5wt%, Si：0.01~1wt%, Balance of Mg, each component weight percent sum is 100wt%；

The second corrodible material composition is：Mg：2~7.8wt%, Cu：0.01~4wt%, Sn：0.01~2wt%, Zn：0.01~9wt%, Ga：0.1~4.5wt%, Mn：0.01~1wt%, In：0.1~4.5wt%, Fe：0.01~3wt%, Balance of Al, each component weight percent sum is 100wt%.

The degraded of bridging plug parts that above-mentioned material composition proportion is made, corrosive nature and intensity, hardness performance can be with Preferably meet the demand of oil and gas reservoir pressure break and oil-gas mining.Certainly, material composition proportioning disclosed above is only this practicality New preferred cost proportioning, those skilled in the art can also be to its part or all of element and the percentage by weight of element It is modified.Meanwhile, above-mentioned material can also be applied to manufacture the parts of other bridging plugs outside bridging plug parts.

The preparation technology of optionally implementation method, the first corrodible material or the second corrodible material includes following steps Suddenly：

Step A：Smelt, cast

Matched by the alloy compositions of design, weigh each component, after the fusing that heats up, refining, casting；

Step B：Post processing

First step gained ingot casting is carried out into heat treatment includes homogenizing annealing, quenches, and Ageing Treatment or deformation process (are wrapped Include extruding, forging, rolling etc.).

Optionally implementation method, the smelting mode in step A is that vacuum metling or atmosphere protection are smelted.

Optionally implementation method, when preparing the first corrodible material, the step A includes step：

Vacuum metling according to a certain ratio or atmosphere protection smelt the first corrodible material intermediate alloy C, the first corrodible material Material intermediate alloy C includes aluminium, manganese, iron, silicon and copper；

Smelted using atmosphere protection or vacuum metling technique, pure magnesium, fine aluminium, pure tin, pure zinc, pure lead are melted first, then add Enter the described first corrodible material intermediate alloy C；

And/or, when preparing the second corrodible material, the step A includes step：

Vacuum metling according to a certain ratio or atmosphere protection smelt the second corrodible material intermediate alloy D, described second Corrodible material intermediate alloy D includes aluminium, copper, manganese, iron；

Smelted using atmosphere protection or vacuum metling technique, pure magnesium, pure gallium, fine aluminium, pure tin, pure zinc, pure indium melted first, Add the described second corrodible material intermediate alloy D.

The fusing point of intermediate alloy is higher, and content is less, and later addition is conducive to making full use of smelting equipment, save energy.

The teeth pedestal 4 of slips, guard ring 14 are preferably and use the first corrodible material, other zero in the utility model The second corrodible material can be used in part in addition to grappling teeth 3, degradable elasticity sealing drum 7.

Above-mentioned any technical scheme disclosed in the utility model unless otherwise stated, if it discloses number range, So disclosed number range is preferred number range, it is any it should be appreciated by those skilled in the art：Preferred numerical value Scope is only the obvious or representative numerical value of technique effect in many enforceable numerical value.Because numerical value is more, Cannot be exhaustive, thus the utility model just openly component values are to illustrate the technical solution of the utility model also, above-mentioned The numerical value enumerated should not constitute the limitation that protection domain is created to the utility model.

If the words such as " first ", " second " are used herein to limit parts, those skilled in the art should This knows：" first ", the use of " second " are intended merely to facilitate in description and parts are distinguished such as no Stated otherwise Outward, above-mentioned word does not have special implication.

Meanwhile, if above-mentioned the utility model is open or relate to the parts or structural member of connection fastened to each other, then, Unless otherwise stated, it is fixedly connected and can be understood as：Can releasably be fixedly connected (for example use bolt or mode connects for screw), Can be understood as：Non-removable to be fixedly connected (such as rivet, weld), certainly, connection fastened to each other can also be integral type Structure (for example being manufactured using casting technique is integrally formed) replaces (substantially cannot be using except integrally formed technique).

In addition, applied in any technical scheme disclosed in above-mentioned the utility model for representing position relationship or shape Term unless otherwise stated its implication include approximate with its, similar or close state or shape.What the utility model was provided Either component can be assembled by multiple individually parts, it is also possible to the list that the technique that is one of the forming is manufactured Only part.

In description of the present utility model if used term " " center ", " longitudinal direction ", " transverse direction ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outward ", " on ", D score etc., then the side that above-mentioned term is indicated Position or position relationship are, based on orientation shown in the drawings or position relationship, to be for only for ease of description the utility model and simplification is retouched State, must be with specific orientation, with specific orientation rather than equipment, mechanism, part or the element for indicating or implying meaning Construction and operate, therefore it is not intended that limitation to the utility model protection domain.

Finally it should be noted that:Above example is only used to illustrate the technical solution of the utility model rather than it is limited System；Although being described in detail to the utility model with reference to preferred embodiment, those of ordinary skill in the art should Understand：Specific embodiment of the present utility model can still be modified or some technical characteristics are equally replaced Change；Without deviating from the spirit of technical solutions of the utility model, it all should cover in the claimed technical scheme of the utility model In the middle of scope.

Claims (10)

1. a kind of ball-and-seat for bridging plug, it is characterised in that including occluding body and guard ring, wherein：

Formed between the guard ring and back-off sub and be detachably connected, and the central through hole of the guard ring connects with described giving up The internal fluid channels of head are connected；The occluding body is blocked on the inwall of the guard ring, and can be by the guard ring Central through hole is blocked to be lost with the central through hole for preventing fluid from passing through the guard ring along described in the direction inflow exported away from stratum The internal fluid channels of hand joint.

2. the ball-and-seat for bridging plug according to claim 1, it is characterised in that the guard ring be degradation material or Corrodible material is made, and its degradation resistant or decay resistance are better than the back-off sub.

3. the ball-and-seat for bridging plug according to claim 1, it is characterised in that the internal diameter size of the guard ring is towards the back of the body Direction from stratum outlet is gradually reduced.

4. the ball-and-seat for bridging plug according to claim 1, it is characterised in that the inner and outer wall of the guard ring is equal It is the conical surface or curved surface.

5. the ball-and-seat for bridging plug according to claim 1, it is characterised in that the guard ring and the back-off sub Between by anticreep circle formed be detachably connected, the anti-knocking over is detachably connected with the back-off sub and can be by the protection The position locking of circle simultaneously can prevent the occluding body from departing from from the guard ring.

6. the ball-and-seat for bridging plug according to claim 5, it is characterised in that be provided with the inwall of the anti-knocking over Stop bit flange, the stop bit flange to be pressed on and be resisted against the back-off sub so that the guard ring to be locked on the guard ring External port on position；Or, both the anti-knocking over and described guard ring are fixedly connected for integral type structure or both.

7. the ball-and-seat for bridging plug according to claim 5, it is characterised in that be provided with anticreep in the anti-knocking over convex Edge or anti-break pin, the anticreep flange or anti-break pin can prevent the occluding body from being taken off from the external port of the back-off sub From.

8. the ball-and-seat for bridging plug according to claim 5, it is characterised in that the anti-knocking over, the occluding body are equal By degradation material or corrodible material are made.

9. a kind of bridging plug, it is characterised in that including any described list for bridging plug of back-off sub and claim 1-8 Stream valve.

10. bridging plug according to claim 9, it is characterised in that the is partly or entirely used in the parts of the bridging plug One corrodible material or the second corrodible material, wherein：

The performance of the first corrodible material meets following condition：At room temperature compressive strength be more than 400MPa, at 70 DEG C and Corrosion rate is more than 0.2mg/cm in 0.5% Klorvess Liquid²·hr；And/or,

The performance of the second corrodible material meets following condition：Compressive strength is more than 320MPa at room temperature, at 70 DEG C KCE content be 0.5% solution in corrosion rate be more than 0.1mg/cm²·hr。