CN206957636U - Look for leakage packer - Google Patents

Abstract

The utility model discloses one kind to look for leakage packer, including：Top connection, upper shield, central tube, packing element, lower shield and lower contact, wherein, top connection is in hollow revolution build, and it is fixedly connected close to the inner side of lower end with the upper end of central tube, and it is fixedly connected close to the outside of lower end with upper shield；Lower contact is in hollow revolution build, and it is fixedly connected close to the inner side of upper end with the lower end of central tube, and it is fixedly connected close to the outside of upper end with lower shield；Central tube is hollow body, and its outer sheath is provided with packing element；Perforate is provided with the tube wall of central tube；Packing element has relative top and bottom, and the outside of the lower surface of top connection, the inner side of upper shield and central tube is formed with the first limiting section that packing element upper end is set for card；The outside of the upper surface of lower contact, the inner side of lower shield and central tube is formed with the second limiting section that packing element lower end is set for card.Provided by the utility model to look for leakage packer, can be applied to position below casing deformation well looks for the omission of examination to alter.

Description

Look for leakage packer

Technical field

Petroleum production engineering field is the utility model is related to, more particularly to one kind looks for leakage packer.

Background technology

With deepening continuously for oil field development, the frequent steam injection of oil well take turns the continuous expanded by heating of steam soak rear sleeve more, Easily occurs the situation such as sleeve pipe damage, run-down under thermal stress effect.Once there is casing leakage in oil well, does not only result in injection steam Heat loss increases, and sleeve pipe damage, leakage near sites water layer water will channelling come to cause a large amount of water outlets of oil well, and to Oil reservoir pours in down a chimney, and oil well is not produced normally, or even be forced closing well.In order to ensure the normal production of oil well, it is necessary to be damaged to sleeve pipe The bad position missed is blocked.

To reach the purpose of closure, it is necessary first to find out accurate casing leakage position, then it is implemented to seal accordingly It is stifled.At present, generally using Y521-150 packers look for Lou.But the packer be only applicable to sleeve pipe do not deform it is complete In good oil well.As casing deformation causes local reducing, because packer external diameter can not become section by the set greatly, set is caused to conjugate Putting can not carry out looking for the omission of examination to alter with setting of casing.

Therefore, it is necessary to look for the omission of examination to alter for position below casing deformation well, propose it is a kind of it is special look for Lou packer with gram The defects of taking prior art.

Utility model content

The purpose of this utility model is to provide one kind and looks for leakage packer, and can be applied to position below casing deformation well looks for the omission of examination Alter.

Above-mentioned purpose of the present utility model can be realized using following technical proposal：

One kind looks for leakage packer, and described to look for the sleeve pipe that Lou packer is used to cover below change position to look for Lou, it includes：On connect Head, upper shield, central tube, packing element, lower shield and lower contact,

Wherein, the top connection is in hollow revolution build, and it consolidates close to the inner side of lower end and the upper end of the central tube Fixed connection, it is fixedly connected close to the outside of lower end with the upper shield；

The lower contact is in hollow revolution build, and it is fixed close to the inner side of upper end and the lower end of the central tube connects Connect, it is fixedly connected close to the outside of upper end with the lower shield；

The central tube is hollow body, and its outer sheath is provided with the packing element；It is provided with the tube wall of the central tube Perforate；

The packing element has a relative top and bottom, the lower surface of the top connection, the inner side of upper shield with it is described in The outside of heart pipe is formed with the first limiting section that the packing element upper end is set for card；The upper surface of the lower contact, lower shield Inner side and the outside of the central tube are formed with the second limiting section that the packing element lower end is set for card.

In one preferred embodiment, the perforate of the central tube is opened including first in the middle part of the packing element Hole, the number of first perforate is multiple, is evenly arranged along the circumferencial direction of the central tube.

In one preferred embodiment, the perforate of the central tube also includes the positioned at the first perforate both sides Two perforates and the 3rd perforate, the number of second perforate or the 3rd perforate is multiple, along the circumferencial direction of the central tube It is evenly arranged.

In one preferred embodiment, the upper shield has relative top and bottom, and second perforate is just To the lower end position of the upper shield.

In one preferred embodiment, the lower shield has relative top and bottom, and the 3rd perforate is just To the upper end position of the lower shield.

In one preferred embodiment, it is described look for Lou packer there is non-set state and to set state, described Non- to set under state, the external diameter of the packing element is less than or equal to the external diameter of the upper shield and lower shield.

In one preferred embodiment, it is described it is non-set state under, it is described look for Lou packer maximum outside diameter be 132 millimeters.

In one preferred embodiment, it is described look for Lou packer set pressure as more than 1 MPa.

In one preferred embodiment, the upper shield and the top connection coordinate position and the lower shield with The position that the lower contact coordinates is additionally provided with O-ring seal.

In one preferred embodiment, the top connection close to the outside of its lower end formed with the first limited step, First limited step is located at the top of second perforate；The lower contact is provided with the second limit on the outside of its upper end Position step, second limited step are located at the bottom of the 3rd perforate.

In one preferred embodiment, the packing element includes respectively from the inside to the outside：Inner bag, line layer, outer layer, cross-linked layer And cortex, wherein, the material of the cortex is the abrasive rubber with predetermined hardness.

In one preferred embodiment, the top connection is provided with upper limit ring on the inside of its lower end, described Lower contact is provided with lower limit ring on the inside of its upper end.

In one preferred embodiment, the perforate of the central tube is opened including relative with the middle part of the packing element first Hole, and it is located at the second perforate and the 3rd perforate of the first perforate both sides along the axis direction of the packing element, wherein,

Second perforate is located at the bottom of the upper limit ring, and with the upper shield face；

3rd perforate is located at the top of the lower limit ring, and with the lower shield face.

The characteristics of the utility model and advantage are：A kind of sleeve pipe for being used to cover below change position provided by the utility model is looked for Leakage packer is looked in leakage, and it mainly includes：Top connection, upper shield, central tube, packing element, lower shield and lower contact, wherein top connection It is used to connect other downhole tools or part inside upper end；It is connected outside its lower end with upper shield top.Packing element is placed in central tube Outside simultaneously passes through upper shield and lower shield compression packing element both ends.Central tube is connected with top connection and lower contact respectively outside both ends, Perforate is provided with central tube, is connected on the inside of lower shield with lower contact, the other downhole tools of lower contact lower end external connection or portion Part.The packer maximum outside diameter is only Φ 132 millimeters (mm), more former packer reduced diameter 20mm.In use, connected by oil pipe Lou design attitude in packer tripping in casing deformation well will be looked for by connecing, and after installing well head, be beaten on ground using cementing truck water filling into oil pipe Pressure, the spring that the valve ball of eccentric flow controller compresses under hydraulic action, sidewise hole is opened and plays throttling action, now in oil pipe Pressure be higher than the pressure of oil jacket annular space, after pressure difference is higher than 1 MPa (MPa), liquid is from looking for opening for the Lou central tube of packer Hole enters blister cavities in packing element, is strutted by hydraulic pressure and expands packing element, its outer surface is close to shaft in wall, so as to Seal Oil collar-shaped Space, now packer completion are set.Continue to suppress, sleeve pipe look for Lou.Bleed off oily overpressure and look for leakage packing element Recovery, removing seal for packer, the packer can repeatedly be set, be unsealed, and realize that the sleeve pipe that set becomes below position is looked for Lou.

With reference to following explanation and accompanying drawing, the particular implementation of the application is disclose in detail, specifies the original of the application Reason can be in a manner of adopted.It should be understood that presently filed embodiment is not so limited in scope.In appended power In the range of the spirit and terms that profit requires, presently filed embodiment includes many changes, modifications and is equal.

The feature for describing and/or showing for a kind of embodiment can be in a manner of same or similar one or more Used in individual other embodiment, it is combined with the feature in other embodiment, or substitute the feature in other embodiment.

It should be emphasized that term "comprises/comprising" refers to the presence of feature, one integral piece, step or component when being used herein, but simultaneously It is not excluded for the presence or additional of one or more further features, one integral piece, step or component.

Brief description of the drawings

Fig. 1 is a kind of structural representation for looking for Lou packer provided in the application embodiment.

Description of reference numerals：

Top connection 21；O-ring seal 22；Upper shield 23；Central tube 24；First perforate 241；Second perforate 242；3rd opens Hole 243；Packing element 25；Lower shield 26；Lower contact 27；First limited step 210；Second limited step 270；Upper limit ring 211；Under Spacing ring 271.

Embodiment

Below in conjunction with the drawings and specific embodiments, the technical solution of the utility model is elaborated, it should be understood that These embodiments are merely to illustrate the utility model rather than limitation the scope of the utility model, new having read this practicality After type, modification of the those skilled in the art to the various equivalent form of values of the present utility model each falls within the application appended claims In limited range.

It should be noted that when element is referred to as " being arranged at " another element, it can be directly on another element Or there may also be element placed in the middle.When an element is considered as " connection " another element, it can be directly connected to To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " on ", " under ", "left", "right" and similar statement for illustrative purposes only, it is unique embodiment to be not offered as.

Unless otherwise defined, all of technologies and scientific terms used here by the article and the technical field of the application is belonged to The implication that technical staff is generally understood that is identical.The term used in the description of the present application is intended merely to description tool herein The purpose of the embodiment of body, it is not intended that in limitation the application.Term as used herein "and/or" includes one or more The arbitrary and all combination of related Listed Items.

The utility model provides one kind and looks for leakage packer, and can be applied to position below casing deformation well looks for the omission of examination to alter.

Referring to Fig. 1, one kind is provided in the application embodiment looks for leakage packer, it is described look for Lou packer be used to cover displacement Following sleeve pipe is put to look for Lou, this look for Lou packer can include：Top connection 21, upper shield 23, central tube 24, packing element 25, lower shield Cover 26 and lower contact 27, wherein, the top connection 21 is in hollow revolution build, and it is close to the inner side of lower end and the central tube 24 upper end is fixedly connected, and it is fixedly connected close to the outside of lower end with the upper shield 23；The lower contact 27 is in hollow Turn round build, it is fixedly connected close to the inner side of upper end with the lower end of the central tube 24, its close to the outside of upper end with it is described Lower shield 26 is fixedly connected；The central tube 24 is hollow body, and its outer sheath is provided with the packing element 25；The central tube 24 Tube wall on be provided with perforate；The packing element 25 has relative top and bottom, the lower surface of the top connection 21, upper shield 23 inner side and the outside of the central tube 24 are formed with the first limiting section that the upper end of packing element 25 is set for card；Connect under described First 27 upper surface, the outside of the inner side of lower shield 26 and the central tube 24 for card formed with setting the lower end of packing element 25 Second limiting section.

It is provided by the utility model it is a kind of be used for cover become position below sleeve pipe look for leakage look for leakage packer, it is mainly wrapped Include：Top connection 21, upper shield 23, central tube 24, packing element 25, lower shield 26 and lower contact 27, wherein inside the upper end of top connection 21 For connecting other downhole tools or part；It is connected outside its lower end with the top of upper shield 23.Packing element 25 is placed in outside central tube 24 Portion simultaneously compresses the both ends of packing element 25 by upper shield 23 and lower shield 26.Outside the both ends of central tube 24 respectively with top connection 21 and under connect First 27 are connected, and perforate is provided with central tube 24, and the inner side of lower shield 26 is connected with lower contact 27, the lower end external connection of lower contact 27 Other downhole tools or part.The packer maximum outside diameter is only Φ 132 millimeters (mm), more former packer reduced diameter 20mm. In use, Lou design attitude in packer tripping in casing deformation well will be looked for by oil pipe connection, after installing well head, cement is utilized on ground Car water filling into oil pipe is suppressed, and the spring that the valve ball of eccentric flow controller compresses under hydraulic action, sidewise hole is opened and plays section Stream act on, now the pressure in oil pipe be higher than oil jacket annular space pressure, after pressure difference be higher than 1 MPa (MPa), liquid from look for Lou envelope Enter blister cavities in packing element 25 every the perforate of the central tube 24 of device, strutted by hydraulic pressure and expand packing element 25, its outer surface is close to well Cylinder inwall, so as to seal oil sets annular space, now packer is completed to set.Continue to suppress, sleeve pipe look for Lou.Bleed off oil Overpressure look for Lou packing element 25 reclaim, removing seal for packer, the packer can repeatedly be set, be unsealed, realize set become Sleeve pipe below position is looked for Lou.

In the present embodiment, it is in hollow revolution build that top connection 21 is overall, and the hollow space is through hole, and it has There are relative top and bottom.Wherein, internal thread can be provided with close to the inner side of upper end, to facilitate the other downhole tools of connection Or part；Upper shield 23 can be fixed with close to the outside of its lower end, can be with the upper end of central tube 24 close to the inner side of lower end It is mutually fixed.Specifically, the fixed form can be threaded connection.When the fixed form for threaded connection when, it is described on connect First 21 are provided with external screw thread on the outside of lower end, are provided with the inside of the upper end of upper shield 23 and the lower end of top connection 21 The internal thread that the external screw thread in outside matches.The top connection 21 is provided with internal thread, the center on the inside of its lower end Pipe 24 is provided with the external screw thread for matching with the internal thread of the lower end inside of top connection 21 on the outside of upper end.

In the present embodiment, the overall structure of lower contact 27 and the structure of the top connection 21 are similar, overall in hollow Revolution build, the hollow space is through hole, and it has relative top and bottom.Wherein, can close to the outside of lower end To be provided with external screw thread, to facilitate the other downhole tools of connection or part；Lower shield can be fixed with close to the outside of its upper end 26, can mutually it be fixed with the lower end of central tube 24 close to the inner side of upper end.Connect specifically, the fixed form can be screw thread Connect.When the fixed form is is threadedly coupled, the lower contact 27 is provided with external screw thread, the lower shield on the outside of upper end Cover the internal thread for being provided with the inside of 26 lower ends and matching for the external screw thread on the outside of the upper end of lower contact 27.The lower contact 27 are provided with internal thread on the inside of its upper end, and the central tube 24 is provided with the outside of lower end to be used for and connect under described The external screw thread that internal thread on the inside of first 27 upper end matches.

In the present embodiment, it is in hollow sleeve-shaped that upper shield 23 is overall, and the hollow space is through hole.On described Shield 23 has relative top and bottom, can be provided with close to the inner side of its upper end for coordinating with the top connection 21 Internal thread, the upper end of the packing element 25 is set on the inside of its underpart, it is spacing for being carried out to the upper end of packing element 25, ensure glue Cylinder 25 set changed with unset state and setting with unset state when, the upper end of packing element 25 can be by reliably spacing.

In the present embodiment, the overall structure of lower shield 26 and the structure of the upper shield 23 are similar, the lower shield 26 entirety are in hollow sleeve-shaped, and the hollow space is through hole.The lower shield 26 has relative top and bottom, leans on The inner side of its nearly lower end can be provided with the internal thread for coordinating with the lower contact 27, be set on the inside of its top described The lower end of packing element 25, it is spacing for being carried out to the bottom of packing element 25, ensure packing element 25 set with unset state and set with When unset state is changed, the lower end of packing element 25 can be by reliably spacing.

In the present embodiment, it is in hollow body that the central tube 24 is overall, and its hollow space is through hole, described The outer sheath of central tube 24 is provided with the packing element 25；Perforate is provided with the tube wall of the central tube 24.When described look for Lou insulates When device needs to seal, by suppressing, hydraulic pressure enters blister cavities in packing element 25 by the perforate, is strutted by hydraulic pressure and expands packing element 25, its outer surface is close to shaft in wall, so as to seal oil sets annular space, realize setting for packer.

Specifically, first perforate 241 of the perforate of the central tube 24 including being located at the middle part of packing element 25, described first The number of perforate 241 is multiple, is evenly arranged along the circumferencial direction of the central tube 24, so as to ensure that the packing element 25 can quilt Uniformly reliably strut, realize and look for setting for Lou packer.

Further, the perforate of the central tube 24 also includes the second perforate 242 positioned at the both sides of the first perforate 241 With the 3rd perforate 243, the number of the perforate 243 of the second perforate 242 or the 3rd is multiple, along the circumference of the central tube 24 Direction is evenly arranged.When the perforate of the central tube 24 is also distributed multigroup along the axial direction of the central tube 24, it is ensured that When suppressing, hydraulic pressure quickly and efficiently can enter in packing element 25 from multigroup perforate looks for setting for Lou packer so as to realize, Set on the whole efficiently and relatively low to the pressure requirements of hydraulic pressure.Specifically, it is described look for Lou packer set pressure for 1 MPa with On.For example, can be 1 MPa, when the pressure difference in the pressure in oil pipe and oil jacket annular space reaches 1 MPa, this looks for leakage packer It can be achieved to set.

Specifically, the lower end position of upper shield 23 described in the face of the second perforate 242；The face of 3rd perforate 243 The upper end position of the lower shield 26.Wherein, when the lower end position of the upper shield 23 sets to suppress, the packing element 25 is led The position to be exerted a force.Likewise, the upper end position of the lower shield shape is when suppressing to set, the position mainly to be exerted a force to the packing element 25 Put.When the upper end position in the lower end of the upper shield 23 and lower shield 26 sets the second perforate 242 and the 3rd perforate of face When 243, when setting, the first perforate 241 positioned at the middle part of central tube 24 coordinates, and realization is reliably set, and the packing element 25 Both ends can be reliably spacing.It is as follows specifically to set process：The outside of the first perforate 241 when suppressing due to middle part does not limit Position, pressure fluid enter from the first perforate 241, the part of packing element 25 are strutted first so that pressure fluid is simultaneously from the He of the second perforate 242 Enter at 3rd perforate 243 in packing element 25, realization is set.During due to setting, the pressure fluid of entrance at second perforate 242 Pressure and the lower end of upper shield 23 coordinate caused by under clamping force effect, the top of the packing element 25 is by reliable spacing； Likewise, the pressure of the pressure fluid entered at the 3rd perforate 243 coordinates caused clamp with the upper end of lower shield 26 Under power effect, the bottom of the packing element 25 is by reliable spacing.

In one embodiment, the top connection 21 close to the outside of its lower end formed with the first limited step 210, institute State lower contact 27 and the second limited step 270 is provided with the outside of its upper end.Wherein, first limited step 210 can be with Positioned at the top of second perforate 242, the pressure fluid of the second perforate 242 will not be formed and stopped, second limited step 270 can be located at the bottom of the 3rd perforate 243, the pressure fluid of the 3rd perforate 243 will not be formed and stopped.In addition, work as institute State top connection 21 close to the outside of its lower end formed with the first limited step 210 when, the upper end of the corresponding packing element 25 can be with A minimum limit space is obtained, so that the upper end of the packing element 25 can be by reliably spacing.Likewise, under described When joint 27 is provided with the second limited step 270 on the outside of its upper end, the lower end of the corresponding packing element 25 can obtain One minimum limit space, so that the lower end of the packing element 25 can be by reliably spacing.

In one embodiment, the central tube 24 is hollow body, is provided with the tube wall of the central tube 24 Perforate；The packing element 25 has a relative top and bottom, the lower surface of the top connection 21, the inner side of upper shield 23 with it is described The outside of central tube 24 is formed with the first limiting section that the upper end of packing element 25 is set for card；The upper surface of the lower contact 27, The inner side of lower shield 26 and the outside of the central tube 24 are formed with the second limiting section that the lower end of packing element 25 is set for card, institute State between the both ends of packing element 25 and first limiting section, the second limiting section as interference fit.

Specifically, first limiting section or the second limiting section can be a hollow annular housing, the annular housing Toroidal cavity gap is less than the thickness at the both ends of packing element 25.By set the first limiting section and second it is spacing can be by the glue The both ends of cylinder 25 are relatively fixed with the central tube 24, ensure that the packing element 25 will not occur to slide relatively outside the central tube 24 It is dynamic, and then when can avoid setting, because the problem of card envelope occurs in the excessive expansion of packing element 25, and it is unfavorable for follow-up deblocking and again It is secondary to set and unseal.

In one embodiment, the top connection 21 is provided with upper limit ring 211 on the inside of its lower end, under described Joint 27 is provided with lower limit ring 271 on the inside of its upper end.The lower surface of the top connection 21, the inner side of upper shield 23 with The outside of the upper limit ring 211 is formed with the first limiting section that the upper end of packing element 25 is set for card.The lower contact 27 Upper surface, the inner side of lower shield 26 and the outside of the lower limit ring 271 for card formed with setting the of the lower end of packing element 25 Two limiting sections, it is interference fit between the both ends of the packing element 25 and first limiting section, the second limiting section.

In addition, can also be to be fixedly connected between the both ends of the packing element 25 and first limiting section, the second limiting section. Specifically, it can be cast connection that this, which is fixedly connected with mode, i.e., by the both ends of packing element 25 by way of cast directly and material Fixed for the first limiting section of steel, the second limiting section, excessive expansion during so as to avoid packing element 25 from setting.

In the present embodiment, the upper limit ring 211 can be in hollow annular shape, and it can be by being fixedly connected Mode is arranged on the inner side of the top connection 21.Specifically, the mode being fixedly connected can be threaded connection etc..In addition, The upper limit ring 211 can also be integrally formed with the top connection 21, specifically, the application does not make specific limit herein It is fixed.

In the present embodiment, the lower limit ring 271 can also be in hollow annular shape, and it can be by being fixedly connected Mode be arranged on the inner side of the lower contact 27.Specifically, the mode being fixedly connected can be threaded connection etc..This Outside, the lower limit ring 271 can also be integrally formed with the lower contact 27, specifically, the application does not make specifically herein Restriction.

When by setting the upper limit ring 211 in the inner side of top connection 21, setting institute in the inner side of lower contact 27 After stating lower limit ring 271, the lower surface of the top connection 21, the inner side of upper shield 23 and the outside shape of the upper limit ring 211 Into there is the first limiting section that the upper end of packing element 25 is set for card；The upper surface of the lower contact 27, the inner side of lower shield 26 with The outside of the lower limit ring 271 is and described first spacing formed with the second limiting section that the lower end of packing element 25 is set for card It is interference fit between the both ends in portion, the second limiting section and packing element 25.

Specifically, first limiting section or the second limiting section can be a hollow annular housing, the annular housing Toroidal cavity gap is less than the thickness at the both ends of packing element 25.By set the first limiting section and second it is spacing can be by the glue The both ends of cylinder 25 are relatively fixed with the central tube 24, ensure that the packing element 25 will not occur to slide relatively outside the central tube 24 Dynamic, and then when can avoid setting, the packing element 25 is unfavorable for follow-up deblocking and again because the problem of card envelope occurs in excessive expansion It is secondary to set and unseal.

Further, in the present embodiment, the perforate of the central tube 24 can include and the middle part phase of packing element 25 To the first perforate 241, and along the axis direction of the packing element 25 be located at the second perforate of the both sides of the first perforate 241 242 and the 3rd perforate 243, wherein, second perforate 242 is located at the bottom of the upper limit ring 211, and with the upper shield 23 faces；3rd perforate 243 is located at the top of the lower limit ring 271, and with the face of lower shield 26.When setting When, during highly pressurised liquid flow center pipe 24, highly pressurised liquid can be entered in the packing element 25 by first perforate 241, be realized Packer is set, and when highly pressurised liquid flows through second perforate 242 or three perforates 243, due to second perforate 242 With the face of upper shield 23, the 3rd perforate 243 and the face of lower shield 26.Respectively, flow through second perforate 242 hydraulic pressure is engaged with described in upper shield 23, and an abutting power has been additionally provided equivalent to the upper end for packing element 25, can More reliably fix the upper end of the packing element 25.Likewise, flow through the hydraulic pressure of the 3rd perforate 243 and the phase of lower shield 23 Coordinate, be additionally provided an abutting power equivalent to the lower end for packing element 25, can more reliably fix under the packing element 25 End.In terms of comprehensive, coordinated respectively with upper shield 23 and lower shield 26 by above-mentioned second perforate 242, the 3rd perforate 243, can be with Excessive expansion when packing element 25 is set is effectively ensured.

In the present embodiment, the packing element 25 has relative top and bottom, and its entirety is set in outside central tube 24. The material of the packing element 25 can predominantly corrosion-resistant, wear-resisting flexible rubber be made.The lower end of the top connection 21 Face, the inner side of upper shield 23 and the outside of the central tube 24 for card formed with setting the first spacing of the upper end of packing element 25 Portion；The upper surface of the lower contact 27, the inner side of lower shield 26 and the outside of the central tube 24 are described formed with being set for card Second limiting section of the lower end of packing element 25.Specifically, first limiting section can be annular housing, second limiting section also may be used Think the form of annular housing.

Specifically, the packing element 25 can include respectively from the inside to the outside：Inner bag, line layer, outer layer, cross-linked layer and cortex, its In, the material of the cortex is the abrasive rubber with predetermined hardness.In general, packing element are provided with inner bag, line layer and outer layer.This Apply in embodiment, cross-linked layer and cortex are added on the basis of existing packing element.Wherein described cross-linked layer is used for cementing institute State outer layer and cortex.The cortex is used for the wearability for improving whole packing element.Specifically, the material of the cortex can be with The abrasive rubber of predetermined hardness, the predetermined hardness are worth size to make adaptability tune according to the difference of actual use scene Section, specifically, the application does not make specific limit herein.For example, under using the scene for repeatedly setting and unsealing in needs, The hardness of the cortical material can be with of a relatively high, so as to ensure to retain the dilatancy of original packing element and elastic basis On, ensure sealing when setting while dilatancy amount can be reduced, improve the resistance to pressure and wearability of packing element in itself, satisfaction The use demand for the scene for repeatedly setting and unsealing.

It is described look for Lou packer there is non-set state and to set state, it is described it is non-set state under, the packing element 25 External diameter be less than or equal to the external diameter of the upper shield 23 and lower shield 26, look for Lou packer tripping in before setting in order to described When in well, packing element 25 is protected, situations such as preventing packing element 25 from wearing.Wherein, it is described it is non-set state under, it is described The maximum outside diameter for looking for Lou packer is 132 millimeters.For existing packer, the maximum for looking for Lou packer of the application External diameter reduces 20 millimeters, so that this looks for the size phase of the Lou sleeve pipe that packer can become below position to set Match somebody with somebody, so as to realize looking for Lou for the sleeve pipe below set change position.Certainly, the maximum outside diameter for looking for Lou packer can also be according to reality Border application scenarios it is different and different, such as when the change of original casing size or during casing deformation degree difference, the packer Maximum outside diameter can adaptively adjust, specific the application does not make specific limit herein.

In addition, the upper shield 23 and the position of the top connection 21 cooperation and the lower shield 26 and the lower contact 27 The position of cooperation is additionally provided with O-ring seal 22, and when being set for ensureing to suppress, pressure fluid will not be let out from the position of above-mentioned cooperation Spill.

On the whole, the utility model provides a kind of minor diameter and looks for leakage packer, and the packer can coordinate with flow controller and make With.In use, Lou design attitude in packer tripping in casing deformation well will be looked for by oil pipe connection, after installing well head, utilized on ground Cementing truck water filling into oil pipe is suppressed, and the spring that the valve ball of eccentric flow controller compresses under hydraulic action, sidewise hole is opened To throttling action, now the pressure in oil pipe is higher than the pressure of oil jacket annular space, and after pressure difference is higher than 1 MPa (MPa), liquid is from looking for The perforate for leaking the central tube 24 of packer enters blister cavities in packing element 25, is strutted by hydraulic pressure and expands packing element 25, makes its outer surface tight Shaft in wall is pasted, so as to seal oil sets annular space, now packer is completed to set.Continue to suppress, sleeve pipe look for Lou.Put Fall oily overpressure look for Lou packing element 25 reclaim, removing seal for packer, the packer can repeatedly be set, be unsealed, realize The sleeve pipe that set becomes below position is looked for Lou.

It is provided by the utility model it is a kind of be used for cover become position below sleeve pipe look for leakage look for leakage packer, it is mainly wrapped Include：Top connection 21, O-ring seal 22, upper shield 23, central tube 24, packing element 25, lower shield 26 and lower contact 27, wherein top connection Car has internal thread inside 21 upper ends, to facilitate the other downhole tools of connection or part；Car has screw thread outside lower end, with upper shield 23 Upper internal threaded connects, while is sealed using O-ring seal 22.Packing element 25 is placed in the outside of central tube 24 and passes through upper shield 23 and lower shield 26 compress packing element 25 both ends.Car has screw thread to connect respectively with top connection 21 and lower contact 27 outside the both ends of central tube 24 Connect, perforate is provided with central tube 24, the internal thread of lower shield 26 is connected with the external screw thread of lower contact 27, equally uses O-ring seal 22 Sealed, car has the other downhole tools of threaded connection or part outside the lower end of lower contact 27.The packer maximum outside diameter is only Φ 132 millimeters (mm), more former packer reduced diameter 20mm, is looked for Lou suitable for slight casing deformation well.

Herein cited any digital value all include between lower limit to higher limit with the lower value of an incremented and The all values of upper value, the interval of at least two units between any lower value and any much higher value be present.For example, such as Fruit elaborates that the quantity of part or the value of process variable (such as temperature, pressure, time etc.) are from 1 to 90, preferably from 20 To 80, more preferably from 30 to 70, then purpose is to illustrate that such as 15 to 85,22 are also clearly listed in the specification arrives 68th, 43 to 51,30 to 32 is equivalent.For the value less than 1, it is 0.0001,0.001,0.01,0.1 suitably to think a unit. These are only intended to the example clearly expressed, it is believed that the numerical value enumerated between minimum and peak is possible to Combination is all expressly set forth in the specification in a similar manner.

Unless otherwise indicated, all scopes all include all numerals between end points and end points.It is used together with scope " about " or " approximation " be suitable for two end points of the scope.Thus, " about 20 to 30 " are intended to covering " about 20 to about 30 ", including at least the end points indicated.

All articles and reference disclosed, including patent application and publication, for various purposes by quoting knot Together in this.Describe the term " substantially by ... forms " of combination should include determined by element, composition, part or step and reality Other elements, composition, part or the step of the basic novel feature of the combination are not influenceed in matter.Using term "comprising" or " comprising " describes the combination of element here, composition, part or step it is also contemplated that substantially by these elements, composition, part Or the embodiment that step is formed.Here by using term " can with ", it is intended to which illustrate that " can with " include is described any Attribute is all optional.

Multiple element, composition, part or step can be provided by single integrated component, composition, part or step.It is alternative Ground, single integrated component, composition, part or step can be divided into multiple element, composition, part or the step of separation.It is used for The open "a" or "an" for describing element, composition, part or step is not said to exclude other elements, composition, part Or step.

Above-mentioned each embodiment in this specification is described by the way of progressive, identical between each embodiment Similar portion is cross-referenced, and what each embodiment stressed is and other embodiment difference.

Several embodiments of the present utility model are the foregoing is only, although the embodiment disclosed by the utility model is such as On, but the content is only to facilitate the embodiment for understanding the utility model and using, it is new to be not intended to limit this practicality Type.Any the utility model person of ordinary skill in the field, the spirit and scope disclosed by the utility model are not being departed from On the premise of, any modification and change, but patent of the present utility model can be made in the formal and details of embodiment Protection domain, it must be still defined by the scope that appended claims are defined.

Claims (13)

1. one kind looks for leakage packer, it is characterised in that described to look for the sleeve pipe that Lou packer is used to cover below change position to look for Lou, it is wrapped Include：Top connection, upper shield, central tube, packing element, lower shield and lower contact,

Wherein, the top connection is in hollow revolution build, and it is fixed close to the inner side of lower end and the upper end of the central tube connects Connect, it is fixedly connected close to the outside of lower end with the upper shield；

The lower contact is in hollow revolution build, and it is fixedly connected close to the inner side of upper end with the lower end of the central tube, its It is fixedly connected close to the outside of upper end with the lower shield；

The central tube is hollow body, and its outer sheath is provided with the packing element；Perforate is provided with the tube wall of the central tube；

The packing element has relative top and bottom, the lower surface of the top connection, the inner side of upper shield and the central tube Outside formed with the first limiting section that the packing element upper end is set for card；The upper surface of the lower contact, the inner side of lower shield Outside with the central tube is formed with the second limiting section that the packing element lower end is set for card.

2. look for leakage packer as claimed in claim 1, it is characterised in that the perforate of the central tube includes being located at the packing element First perforate at middle part, the number of first perforate is multiple, is evenly arranged along the circumferencial direction of the central tube.

3. look for leakage packer as claimed in claim 2, it is characterised in that the perforate of the central tube is also included positioned at described the The second perforate and the 3rd perforate of one perforate both sides, the number of second perforate or the 3rd perforate is multiple, along in described The circumferencial direction of heart pipe is evenly arranged.

4. look for leakage packer as claimed in claim 3, it is characterised in that the upper shield has relative top and bottom, The lower end position of upper shield described in the second perforate face.

5. look for leakage packer as claimed in claim 3, it is characterised in that the lower shield has relative top and bottom, The upper end position of lower shield described in the 3rd perforate face.

6. look for leakage packer as claimed in claim 1, it is characterised in that it is described look for Lou packer have and non-set state and seat Envelope state, it is described it is non-set state under, the external diameter of the packing element is less than or equal to the external diameter of the upper shield and lower shield.

7. look for leakage packer as claimed in claim 6, it is characterised in that it is described it is non-set state under, it is described look for Lou insulate The maximum outside diameter of device is 132 millimeters.

8. look for leakage packer as claimed in claim 6, it is characterised in that it is described look for Lou packer set pressure as 1 MPa More than.

9. look for leakage packer as claimed in claim 1, it is characterised in that the position that the upper shield coordinates with the top connection The position coordinated with the lower shield and the lower contact is additionally provided with O-ring seal.

10. look for leakage packer as claimed in claim 3, it is characterised in that the top connection is formed close to the outside of its lower end There is the first limited step, first limited step is located at the top of second perforate；The lower contact is close to its upper end Outside is provided with the second limited step, and second limited step is located at the bottom of the 3rd perforate.

11. look for leakage packer as claimed in claim 1, it is characterised in that the packing element includes respectively from the inside to the outside：Inner bag, Line layer, outer layer, cross-linked layer and cortex, wherein, the material of the cortex is the abrasive rubber with predetermined hardness.

12. look for leakage packer as claimed in claim 1, it is characterised in that

The top connection is provided with upper limit ring on the inside of its lower end, and the lower contact is provided with the inside of its upper end Lower limit ring.

13. look for leakage packer as claimed in claim 12, it is characterised in that the perforate of the central tube includes and the packing element The first relative perforate of middle part, and along the packing element axis direction be located at the first perforate both sides the second perforate and 3rd perforate, wherein,

Second perforate is located at the bottom of the upper limit ring, and with the upper shield face；

3rd perforate is located at the top of the lower limit ring, and with the lower shield face.