CN108868686B - Permanent packer slip - Google Patents
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- CN108868686B CN108868686B CN201810651811.6A CN201810651811A CN108868686B CN 108868686 B CN108868686 B CN 108868686B CN 201810651811 A CN201810651811 A CN 201810651811A CN 108868686 B CN108868686 B CN 108868686B
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- 229910001069 Ti alloy Inorganic materials 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/129—Packers; Plugs with mechanical slips for hooking into the casing
- E21B33/1295—Packers; Plugs with mechanical slips for hooking into the casing actuated by fluid pressure
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Abstract
The invention provides a permanent packer slip which comprises a C-shaped slip body and a fracture sheet, wherein the slip body is provided with a notch, two ends of the fracture sheet are respectively connected with the slip body and cross over the notch, and one side of the fracture sheet facing the inner side wall of the slip body is provided with a fracture groove. In the permanent packer slip, the processing of the fracture sheet and the fracture groove is simpler and easier, and the fracture strength is more accurate and easier to control, so that the fracture strength of the fracture sheet and the slip is more accurate and easier to control, the reduction of fracture test loss is facilitated, the cost is saved, and the fracture and seating sequence of a plurality of groups of slips can be accurately controlled.
Description
Technical Field
The invention relates to the technical field of petroleum, in particular to a permanent packer slip.
Background
The packer is the most common downhole tool in oil field development, is widely applied to various measure operations such as well completion, fracturing, acidizing, water injection, oil testing and the like, and is mainly used for separating production intervals to meet the requirements of production and measure operations. The packer slip is the most important component for providing safety guarantee for the packer, and considering the pressure bearing capacity of the packer slip and the requirement of later grinding and milling, the slip structure generally adopts a barrel type structure, and is provided with an axial groove on the circumference, when the packer slip is clamped, the slip is required to be fractured at the axial groove, so that teeth on the peripheral surface of the slip bite into the casing to complete clamping, the packer is anchored, and the effects of supporting the packer and locking a rubber barrel assembly with the setting effect are achieved. In fact, the breaking strength of the slip axial groove is not easy to control, the machining error of the slip, the heat treatment process and the like can influence the actual breaking strength of the axial groove, a large number of slip test finished products are consumed in the axial groove breaking strength test process, the slip structure is fine, the manufacturing cost is high, and the manufacturing cost of the test finished products is high due to the large number of losses in the test. Furthermore, the difference of the axial machining precision of the slip axial groove or the uneven stress of the slip along the axial direction often cause the axial groove of the slip to be broken unevenly along the axial direction, and then the slip is broken incompletely along the axial direction and each section of the slip cannot be released normally, so that the slip is stuck and is invalid. At present, most of researches are mainly based on structure optimization, and the fundamental problem cannot be solved.
Disclosure of Invention
In order to solve the technical problems, the embodiment of the invention provides a permanent packer slip which has the advantages of accurate and easily-controlled fracture strength, small fracture test loss, low cost and convenience for accurately controlling the fracture and setting sequence of a plurality of groups of slips.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
an embodiment of the present invention provides a permanent packer slip, including:
a C-shaped slip body having a notch;
and two ends of the fracture piece are respectively connected with the slip body and span the notch, and one side of the fracture piece, facing the inner side wall of the slip body, is provided with a fracture groove.
Through setting up the integral slips body of C shape tubbiness, utilize the C shape lateral wall of slips body to form an axial breach, the both ends of rupture piece are connected with the lateral wall of slips body (can be the outside wall face of the C shape lateral wall that is located the breach both sides or the interior lateral wall face of C shape lateral wall or the terminal surface of C shape lateral wall), make the rupture piece span on the breach to guarantee that the lateral wall of slips body can not open.
Meanwhile, one side of the fracture piece facing the inner side wall of the slip body is provided with a fracture groove, when a permanent packer slip (hereinafter, simply referred to as slip) is clamped, under the action of hydraulic thrust, the cone and the slip body move relatively along the axial direction, and in the process of contact and continuous opposite movement between the cone and the slip body, the cone continuously applies radially outward expanding propping acting force (i.e. acting force for propping apart the side walls of the slip body on two sides of the notch) to the C-shaped side wall of the slip body, so that fracture load is applied to the fracture piece connected on two sides of the notch, when the propping acting force reaches the fracture strength of the fracture piece (i.e. the fracture load borne on a unit area when the fracture piece fractures), the fracture piece fractures along the fracture groove, and then the side wall of the slip body expands radially outward until clinging to the inner wall of the sleeve and anchors the inner wall of the sleeve, and the slip clamping and packer setting are realized.
In the embodiment of the invention, compared with the mode of arranging the axial fracture groove on the slip body in the prior art, the structure of the fracture piece and the fracture groove is greatly simplified, so that the fracture piece and the fracture groove are simpler and easier to process, and the adverse effect of the processing precision difference on the slip body on the fracture strength of the fracture piece is favorably reduced; the breaking strength of the breaking piece (or the breaking groove) can be controlled more conveniently and flexibly by reasonably adjusting the width, thickness, shape and material quantity of the breaking piece (or the breaking groove) and the arrangement form (including shape, single side or double sides, whether the breaking piece is communicated along the width direction of the breaking piece, and the like) of the breaking groove on the breaking piece, so that the breaking strength of the breaking piece (namely the breaking strength of the slips) is more accurate and easy to control, the test loss of the slip breaking test is reduced, and the cost is saved. In addition, the fracture length of the fracture piece and the fracture groove along the axial direction (along the axial direction of the slip body) is effectively reduced, so that the problem that the slip body (and slip teeth) cannot be normally released due to incomplete fracture easily caused when the slip body is fractured along the axial direction is solved, and the probability of slip clamping failure can be reduced.
In addition, as the well completion packer is widely designed by adopting a bidirectional slip structure to perform upper and lower clamping, the upper slip is generally required to be clamped and then the lower slip is required to be clamped, and in order to control the clamping sequence of the upper slip and the lower slip, the difference value of the fracture load of the upper slip and the lower slip is required to be in a proper range.
Optionally, the breaking piece is provided in one or more.
The breaking piece can be arranged into an integral piece to cross at a local position of the notch along the axial direction, or can be arranged into a plurality of separated strip-shaped structures which respectively cross within a certain length range of the notch along the axial direction, so that two ends of each strip-shaped structure are connected with different positions of the side wall of the slip body. Of course, it is also possible to provide only one strip-shaped rupture disc, provided that only a low rupture strength is required. Through reasonable arrangement of the structural form, the number and the connection form of the fracture pieces, the flexible and accurate control of the fracture strength and the fracture strength gradient of the fracture pieces is also facilitated.
Optionally, the fracture groove extends through a sidewall of the fracture piece in an axial direction of the slip body.
In an embodiment of the invention, the fracture grooves extend through the sidewalls of the fracture plate in the axial direction of the slip body (i.e., in the width direction of the fracture plate). The fracture groove is axially formed, so that when the side walls of the slip body, which are positioned on two sides of the notch, are subjected to expansion force, the slip body is easier to break and more sufficient in fracture, and after the side walls of the slip body are broken along the axial fracture groove, the side walls of the slip body are radially and outwards opened from the notch so as to anchor the inner wall of the sleeve.
Optionally, the slip body includes a connection end, the connection end having a connection portion disposed thereon.
In the embodiment of the invention, the slip body is fixedly connected with the slip seat along the axial direction through the connecting part. Particularly, connecting portion set up to processing internal thread on slips body inside wall, the slips body passes through the external screw-thread fit on internal thread and the slips seat with the coupling, make slips body and slips seat keep relatively fixed, and then before guaranteeing slips seat and the cone does not have relative motion, the slips body can not produce relative motion with the cone, thereby avoided among the prior art slips because do not have fixedly at the axial, meet the wall of a well and cause very easily when irregular meeting at the slips and hinder (hang card etc.) department, the cone struts the slips body and leads to the packer to sit the card in advance and sit the accident of sealing. Of course, the connecting part can also be an external thread arranged on the outer side wall of the slip body, and the technical effects can also be achieved.
Optionally, an axial positioning shoulder is provided on the slip body adjacent to the connection portion.
In the embodiment of the invention, the slip seat and the slip body are in axial limit fit through the axial positioning shoulder. As the example in this embodiment, the axial positioning circular bead sets up on the inside wall of slips body and is located the end that ends of connecting portion, when the slip bowl along the internal thread precession on the slips body inside wall until with the axial positioning circular bead butt, the axial positioning circular bead can carry out spacing backstop to the axial position of slips body to prevent that the cone from pushing the slips body in order to sit the card in-process, retreat towards slip bowl one end along the axial because of the slips body, lead to the unable normal cooperation of pushing of cone and slips body, cause the condition of sitting the card failure to take place.
In addition, the slip body is axially limited and radially limited through the connecting part (such as internal threads) on the inner side wall of the slip body and the axial positioning shoulder, so that the slip body is not easy to deform due to axial or radial extrusion deflection when the slip body is installed, and adverse effects on the fracture performance of the fracture piece are eliminated; and when the slips are clamped, the conical inclined plane structure between the cone and the slips body is convenient to be accurately aligned and matched, and the reliability of relative motion matching between the cone and the slips body is improved when the slips are clamped.
Optionally, be provided with multichannel axial groove along the circumference interval on the lateral wall of slips body, the slips body includes the work end, the accessible deformation of work end outwards opens, the axial trench is located the one end of work end is along radially running through the lateral wall of slips body.
The slip comprises a slip body and is characterized in that a plurality of axial grooves are formed in the outer side wall of the slip body at intervals along the circumferential direction, slip teeth are arranged among the plurality of axial grooves and surround the circumferential direction of the slip body, and one end, located at the working end of the slip body, of each axial groove penetrates through the side wall of the slip body along the radial direction. The slip body can be fully deformed when being propped open by arranging the axial grooves, and the slip teeth are driven to be smoothly propped open to anchor the inner wall of the sleeve. Especially, the one end that is located slips body working end of axial groove is along radially lining up for deformability is stronger when the lateral wall of this one end outwards expands, is convenient for the cone further to stretch into the inner circumferential face of slips body working end.
Optionally, the fracture groove is U-shaped or V-shaped or C-shaped or semi-circular.
In the embodiment of the invention, the fracture groove can be arranged to be in a U shape, a V shape, a C shape or a semicircular shape, and generally, the sharper the fracture groove shape, the greater the depth of the notch shape and the smaller the thickness of the notch, the smaller the fracture load that can be borne by the fracture groove under the same fracture sectional area, i.e. the earlier the fracture. Therefore, the actual breaking strength of the breaking pieces can be flexibly adjusted by selecting different shapes of the breaking grooves and reasonably adjusting the thickness of the breaking grooves, and the breaking sequence of the breaking pieces on different slips can be accurately controlled.
Optionally, the fracture piece is in a rectangular strip shape or a waist-shaped strip shape (both ends are arc-shaped, and the middle is in a rectangular strip shape) or an oval strip shape.
Optionally, two mounting holes are formed in two ends of the fracture piece, two screw holes are correspondingly formed in the side wall of the slip body, and screws penetrate through the mounting holes and the screw holes to fixedly connect the fracture piece with the slip body.
The selected screws are matched with the mounting holes and the screw holes to realize the fixed connection between the fracture piece and the two side walls of the slip body, the fastening mode is simple and firm, the processing of the screw holes in the mounting holes of the fracture piece and the slip body is simple, the materials of the screws are easy to obtain, and the reduction of the assembly cost of the fracture piece and the slip body is facilitated.
Optionally, two buckles are arranged at two ends of the fracture piece, two clamping holes are correspondingly formed in the side wall of the slip body, and the fracture piece is fixedly connected with the slip body through the buckles inserted into the clamping holes.
For example, two buckles can also be set up to two inside pothooks, and two clamping grooves are correspondingly arranged on the two side walls of the slip body, and two pothooks are clamped in the two clamping grooves, so that the rupture sheet is fixedly connected with the slip body. Fixed through the buckle joint, the dismouting efficiency is improved in the installation of being convenient for and dismantlement.
Optionally, two mounting holes are formed in two ends of the fracture piece, two insertion holes are correspondingly formed in the side wall of the slip body, and a bolt penetrates through the mounting holes and the insertion holes to fixedly connect the fracture piece with the slip body. Fixed through the bolt grafting, can have the convenient and installation of being convenient for of mounting hole processing concurrently and dismantle the advantage.
Optionally, both ends of the fracture piece are fixedly connected with the side wall of the slip body through welding.
When the welding mode is adopted, the installation structures do not need to be additionally arranged on the two ends of the fracture piece and the side walls of the slip body, which are positioned on the two sides of the notch, the structures of the fracture piece and the slip body can be further simplified, only welding flux needs to be added during connection, and the fixation is relatively firm.
Compared with the prior art, the invention has the following beneficial effects:
1. compared with the mode that the axial fracture groove is arranged on the slip body, the structure of the fracture piece and the fracture groove is greatly simplified, so that the fracture piece and the fracture groove are simpler and easier to process, and the adverse effect of the processing precision difference of the slip body on the fracture strength of the fracture piece is favorably reduced, so that the fracture strength of the fracture piece and the fracture groove is more accurate and easier to control, the fracture test loss is reduced, and the cost is saved;
2. the quantity, width, thickness, shape, material, position and the like of the fracture pieces or the fracture grooves are reasonably adjusted, so that the fracture strength of the fracture pieces or the fracture grooves is more flexibly and accurately controlled, the fracture and setting sequence of a plurality of groups of slips is conveniently and accurately controlled, and the service performance of the packer is improved;
3. the fracture piece or the fracture groove has reduced fracture length along the axial direction, so that the problem that the slips teeth cannot be normally released due to incomplete fracture of the slips body is avoided;
4. the slip body is provided with threads and an axial positioning shoulder which are respectively in shaft connection with the slip seat, and axial limiting and radial limiting matching are realized, so that the slip body is not easy to deform when being installed, the problem that the slip body cannot move and lose efficacy due to the fact that the slip body is seated in advance at a blocking position of the slip and is stopped to retreat towards one end of the slip seat is solved;
5. through set up multichannel axial groove along circumference interval on the lateral wall of slips body, can fully be out of shape when making slips body strutted, drive the slips tooth and open smoothly with anchoring sleeve pipe inner wall.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a schematic diagram of a permanent packer slip according to an embodiment of the present invention;
FIG. 2 is a schematic perspective view of the slip body of FIG. 1;
FIG. 3 is a schematic cross-sectional view of FIG. 2;
FIG. 4 is a schematic front view of the breaking chip of FIG. 1;
FIG. 5 is a schematic cross-sectional view of FIG. 4;
FIG. 6 is a schematic view of FIG. 1 in an operational state with the packer set;
wherein, the relationship between the reference numbers and the names of the components in fig. 1-6 is:
the permanent packer slip comprises 100 permanent packer slips, 1 slip body, 11 notches, 12 slip teeth, 13 connecting parts (internal threads), 14 axial positioning shoulders, 15 axial grooves, 16 conical inclined planes at the working end of the slip body, 17 screw holes, 18 grooves, 2 fracture sheets, 21 fracture grooves, 22 mounting holes, 3 screws, 4 slip seats and 5 cones.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The present embodiment provides a permanent packer slip 100, as shown in FIG. 1, the packer slip 100 comprising:
the slip comprises a C-shaped slip body 1, wherein the slip body 1 is provided with a notch 11;
and the two ends of the fracture piece 2 are respectively connected with the slip body 1 and span the notch 11, and one side of the fracture piece 2 facing the inner side wall of the slip body 1 is provided with a fracture groove 21.
The slips body 1 is arranged into a C-shaped barrel-shaped integral slips body, a hollow sleeve-shaped structure is enclosed by the C-shaped inner side wall, during installation, the slips body 1, the slip seat 4 and the cone 5 are respectively sleeved on the outer side wall of the mandrel (or the central pipe), and the cone 5 and the slip seat 4 are respectively positioned at two ends of the slips body 1. An axial gap 11 is formed by using a C-shaped side wall of the C-shaped slip body 1, and two ends of the fracture piece 2 are connected with the side wall of the slip body 1 (which may be an outer side wall surface of the C-shaped side wall or an inner side wall surface of the C-shaped side wall or an end surface of the C-shaped side wall on two sides of the gap 11), so that the fracture piece 2 spans over the gap 11 to ensure that the C-shaped side wall cannot be opened before the slip body 1 is seated.
Meanwhile, a fracture groove 21 (shown in fig. 5) is arranged on one side of the fracture piece 2 facing the inner side wall of the slip body 1, and as shown in fig. 6, when the packer slip 100 is set, under the action of hydraulic thrust, the cone 5 and the slip body 1 move relatively in the axial direction, and when the cone 5 and the slip body 1 are in contact and continue to move relatively, the cone 5 continuously applies a radially outward expanding propping and squeezing force to the C-shaped side wall of the slip body 1, so that fracture loads are applied to the fracture pieces 2 connected to two sides of the notch 11, and when the fracture strength of the fracture groove 21 is reached, the fracture piece 2 connected between the two side walls can be fractured along the fracture groove 21, and then the side wall of the slip body 1 is radially outward stretched until the fracture piece clings to the inner wall of the casing and is anchored to the inner wall of the casing, thereby realizing setting of the packer and setting of the slip 100.
In the embodiment, compared with the mode that the axial breaking groove 21 is arranged on the slip body 1 in the prior art, the structure of the breaking piece 2 and the breaking groove 21 is greatly simplified, so that the processing of the breaking piece 2 and the breaking groove 21 is simpler and easier, and the adverse effect of the processing precision difference on the slip body 1 on the breaking strength of the breaking piece 2 is favorably reduced; the breaking strength of the breaking piece 2 (or the breaking groove 21) can be controlled more conveniently and flexibly by reasonably adjusting the width, thickness, shape and material quantity of the breaking piece 2 (or the breaking groove 21) and the arrangement form (including shape, single side or double side, whether the breaking piece 2 is communicated or not in the width direction) of the breaking groove 21 on the breaking piece 2, so that the breaking strength of the breaking piece 2 (namely the breaking load of the slip 100) is more accurately and easily controlled, the test loss of the slip breaking test is reduced, and the cost is saved. Meanwhile, the fracture length of the fracture piece 2 and the fracture groove 21 along the axial direction (along the axial direction of the slip body 1) is effectively reduced, so that the problem that the slip body 1 (and slip teeth) cannot be normally released due to incomplete fracture easily when the slip body 1 is fractured along the axial direction is solved, and the probability of slip 100 setting failure is reduced.
Furthermore, as the well completion packer is widely designed by adopting a bidirectional slip structure to perform upper and lower clamping, the upper slip is generally required to be clamped and then the lower slip is required to be clamped, and in order to control the clamping sequence of the upper slip and the lower slip, the difference value of the fracture load of the upper slip and the lower slip is required to be in a proper range.
In this embodiment, the breaking grooves 21 may be formed on one side (i.e., inner side wall) of the breaking piece 2 facing the inner side wall of the slip body 1 (as shown in fig. 5), or may be formed on one side (i.e., outer side wall) of the breaking piece 2 facing away from the inner side wall of the slip body 1, or the breaking grooves 21 may be formed on both inner and outer side walls of the breaking piece 2, and the positions of the breaking grooves 21 on the inner and outer side walls are opposite to each other. The breaking groove 21 can be opened in the middle of the breaking piece 2 in this embodiment, and can also be arranged in other positions on the breaking piece 2, the number of the breaking grooves 21 can be one or more, certainly, the breaking grooves 21 can also be omitted, the slip body 1 can be disconnected and opened outwards by directly breaking the breaking piece 2, and the slip is clamped.
In this embodiment, the breaking strength and the breaking strength gradient of the breaking piece 2 (or the breaking groove 21) can be flexibly and accurately controlled by reasonably adjusting the width, thickness, shape, material quantity of the breaking piece 2, the arrangement form of the breaking groove 21 on the breaking piece 2 (including the width, the thickness of the groove, the depth and shape of the notch, the arrangement on one side or both sides, whether the breaking groove is through in the width direction of the breaking piece 2, etc.), and the like, so as to effectively control the breaking load of the slips 100 and the seating sequence of multiple sets of slips.
Optionally, the rupture tab 2 is provided in one or more.
In this embodiment, the fracture piece 2 may be configured as an integral piece to span a local position of the notch 11 along the axial direction, or may be configured as a plurality of separate strip-shaped structures, the plurality of separate strip-shaped structures respectively span a certain length range of the notch 11 along the axial direction, and two ends of each strip-shaped fracture piece 2 are respectively connected to different positions of the side wall of the slip body 1. Of course, it is also possible to provide only one strip-shaped rupture disk 2, provided that only a low rupture strength is required. Through reasonable arrangement of the structural form, the number and the connection form of the fracture pieces 2, the flexible and accurate control of the fracture strength and the fracture strength gradient of the fracture pieces 2 is also facilitated.
As an example in this embodiment, the fracture groove 21 penetrates the side wall of the fracture piece 2 in the axial direction of the slip body 1. When the fracture groove 21 is axially formed to enable the side walls of the slip body 1 located on two sides of the notch 11 to bear expansion force, the slip body is easier to fracture and more sufficient to fracture, so that after the side walls of the slip body 1 fracture along the axial fracture groove 21, the slip body is then radially outwards opened from the notch 11 to anchor the inner wall of the sleeve.
It should be noted that, in this embodiment, there is no limitation on the width of the fracture piece 2 and the proportional relationship between the width and the axial length of the slip body 1, and the fracture piece can be reasonably adjusted according to actual requirements, so as to meet the requirements of the size of the fracture load that can be provided by the hydraulic pressure energy and the convenience of processing.
In this embodiment, the breaking groove 21 is optionally U-shaped, V-shaped, C-shaped, or semicircular.
As shown in fig. 5, the breaking groove 21 is provided in a semicircular shape as an example in this embodiment, of course, the breaking groove 21 may also be U-shaped, V-shaped or C-shaped, and different shapes of the breaking groove 21 are selected, and the theoretical calculation methods of the breaking strength corresponding to the shapes are also different, which results from the notch of the U-shaped, V-shaped, C-shaped or semicircular breaking groove 21 having different notch 11 effects, and generally, the sharper the shape of the breaking groove 21, the greater the depth of the notch shape, and the smaller the thickness of the groove, the smaller the breaking load that the breaking groove 21 can bear under the same breaking sectional area, i.e. the earlier the breaking. Therefore, by selecting different shapes of the breaking grooves 21 and reasonably adjusting the thickness of the breaking grooves 21, the actual breaking strength of the breaking pieces 2 can be flexibly adjusted, and further the breaking load of the slips 100 and the breaking sequence of multiple groups of slips can be accurately controlled.
Further, the fracture pieces 2 are rectangular strip-shaped, waist-shaped strip-shaped or oval strip-shaped.
Alternatively, the fracture sheet 2 may be a rectangular strip or a waist-shaped strip (both ends are arc-shaped, and the middle is a rectangular strip as shown in fig. 5) or an oval strip, which can meet the requirement of fracture strength and is convenient to process.
Optionally, the slip body 1 is made of nodular cast iron or carburizing steel or titanium alloy materials, and the like, so that the strength of the slip body 1 is high, the engaging capacity of the slip teeth 12 is strong, and/or the fracture piece 2 is made of low-carbon steel or ceramic materials, and the like, so that the fracture piece 2 or the fracture groove 21 is easy to process, and the fracture strength is moderate and easy to control. Of course, the material of the slip body 1 and the fracture piece 2 is not limited to the above, and other materials may be selected, which is not limited in this application.
Further, the slip body 1 comprises a connecting end, and a connecting part 13 is arranged on the connecting end. Wherein, connecting portion 13 can set up on the inside wall of slips body 1, makes the inside wall of slips body 1 and the lateral wall of slip bowl 4 be connected along the axial, and perhaps, connecting portion 13 also can set up on the lateral wall of slips body 1, makes the lateral wall of slips body 1 and the inside wall of slip bowl 4 be connected along the axial. In this embodiment, as shown in fig. 2, fig. 3 and fig. 6, the connection portion 13 is configured to be processed with an internal thread 13 on an inner side wall of the slip body 1, the slip body 1 is coupled to an external thread on the slip seat 4 through the internal thread 13, so that the slip body 1 and the slip seat 4 are kept relatively fixed, and further before the slip seat 4 and the cone 5 are ensured to have no relative movement, the slip body 1 cannot move relative to the cone 5, thereby avoiding an accident that the packer is set and sealed in advance due to the fact that the slip is not fixed in the axial direction and is easily caused at a place where the slip meets a blockage (hanging blockage and the like) when a well wall is irregular, and the cone 5 stretches the slip body 1 open. Of course, the connecting portion 13 may be an external thread provided on the outer sidewall of the slip body 1, and the above technical effects can be achieved.
Furthermore, an axial positioning shoulder 14 is arranged on the slip body 1 at a position close to the connecting part 13, and the slip seat 4 and the slip body 1 are in axial limit fit through the axial positioning shoulder 14. In this embodiment, as shown in fig. 2, 3 and 6, the axial positioning shoulder 14 is disposed on the inner side wall of the slip body 1 and located at the cut-off end of the connection portion 13, when the slip bowl 4 is screwed along the internal thread 13 on the inner side wall of the slip body 1 until abutting against the axial positioning shoulder 14, the axial positioning shoulder 14 can perform a limit stop on the axial position of the slip body 1, so as to prevent the cone 5 from pushing the slip body 1 to sit in the process, and the slip body 1 retreats toward one end of the slip bowl 4 along the axial direction, which results in the cone 5 and the slip body 1 being unable to normally push and cooperate, and thus the slip 100 fails to sit.
In addition, the slip body 1 is axially limited and radially limited through the connecting part 13 (such as the internal thread 13) on the inner side wall of the slip body 1 and the axial positioning shoulder 14, so that the slip body 1 is not easy to deform due to axial or radial extrusion deflection when the slip body 1 is installed, and adverse effects on the fracture performance of the fracture piece 2 are eliminated; and when the slips are clamped, the conical inclined plane 16 structure between the cone 5 and the slips body 1 is convenient to be accurately aligned and matched, and the reliability of relative motion matching between the cone 5 and the slips body 1 when the slips 100 are clamped is improved.
It should be understood that in the case of the external thread formed on the outer side wall of the connecting end of the slip body 1, the axial positioning shoulder 14 is correspondingly disposed at the cut-off end of the external thread section outside the slip body 1 in the axial connection with the internal thread formed on the slip bowl 4, and the above technical effects can be achieved.
Further, the slip body 1 further comprises a working end which is deformable to expand outwardly. Specifically, as shown in fig. 3, the inner side wall of the end of the working end of the slip body 1 is configured as a tapered inclined surface 16 that expands outwards, that is, the inner diameter of the working end of the slip body 1 decreases gradually along the direction toward the end surface of the working end of the slip body 1, so that when the slip body 1 is sleeved on the mandrel, a C-shaped annular wedge inlet is formed between the inner side wall of the working end and the outer side wall of the mandrel, and at the same time, the end of the cone 5 opposite to the working end of the slip body 1 is configured as a tapered mating inclined surface (as shown in fig. 6) that matches with the tapered inclined surface 16 on the slip body 1, that is, the end of the cone 5 close to the working end of the slip body 1 decreases inwards (that is, the inner diameter decreases gradually) along the direction close to the slip body 1 to form a wedge. When the packer slip 100 is clamped, the cone 5 moves in opposite directions with the slip seat 4 (integrated with the slip body 1) under the action of axial thrust, the wedge-shaped body at the end part of the cone 5 can easily and quickly extend into a wedge inlet of the working end of the slip body 1, and the wedge-shaped body is matched with the conical matching inclined plane through the conical inclined plane 16 so as to apply radially outward extrusion acting force on the inner side wall of the working end, so that the side wall of the working end is outwards expanded, and the slip teeth 12 are anchored on the inner wall of the casing.
Further, a plurality of axial grooves 15 are circumferentially arranged on the outer side wall of the slip body 1 at intervals. As shown in fig. 2 and 3, in the present embodiment, as an example, each axial groove 15 axially penetrates through an outer side wall of the slip body 1 (i.e., extends from a connecting end surface of the slip body 1 to a working end surface of the slip body 1), a plurality of slip elements 12 circumferentially arranged around the slip body 1 are disposed between the plurality of axial grooves 15, the plurality of slip elements 12 are parallel to each other and axially and uniformly distributed on the outer side wall of the slip body 1 (i.e., extends from the connecting end surface of the slip body 1 to the working end surface of the slip body 1), and a top tooth angle and a pitch angle are disposed on the slip elements 12 to ensure that the slip elements 12 can be firmly anchored on an inner wall of a casing. Wherein the plurality of axial grooves 15 are preferably circumferentially symmetrical and evenly distributed along the slip body 1. The axial grooves 15 can enable the slip body 1 to be fully deformed when being expanded, and drive the slip teeth 12 to be smoothly expanded to anchor the inner wall of the casing. In particular, the axial grooves 15 are formed in the side wall of the slip body 1, through which one end of the slip body 1 at the working end radially penetrates (i.e., through radially), so that the one end has a stronger deformation capability when expanding outward, and the cone 5 can conveniently further extend into the inner circumferential surface of the working end of the slip body 1. The cross-sectional shape of the axial groove 15 in the radial direction may be C-shaped or rectangular. It should be understood that the axial grooves 15 may also be asymmetrically arranged circumferentially along the slip body 1, and this arrangement also achieves the above-described technical effect.
It should be noted that the breaking strength of the axial grooves 15 on the slip body 1 is much greater than that of the breaking pieces 2 (or the breaking grooves 21), so as to ensure that the slip body 1 does not open in advance before the breaking pieces 2 (or the breaking grooves 21) break, thereby ensuring the reliability of the breaking pieces 2.
Further, two ends of the fracture piece 2 can be fixedly connected with the side wall of the slip body 1 through screwing, clamping, inserting or welding.
Specifically, for example, as shown in fig. 1, 4 and 5, two mounting holes 22 are provided at both ends of the fracture piece 2, two screw holes 17 are correspondingly provided on the side walls of the slip body 1 on both sides of the notch 11, and the bolt 3 passes through the mounting holes 22 and fixedly connects the fracture piece 2 with the slip body 1. The selected screws 3 are matched with the mounting holes 22 and the screw holes 17 to realize the fixed connection between the fracture piece 2 and the two side walls of the slip body 1, the fastening mode is simple and firm, the processing of the mounting holes 22 of the fracture piece 2 and the screw holes 17 on the slip body 1 is simple, the materials of the screws 3 are easy to obtain, and the assembly cost of the fracture piece 2 and the slip body 1 is favorably reduced.
Or, the both ends of rupture piece 2 extend towards slips body 1's inside wall and form two buckles, are located and correspond on the lateral wall of 11 both sides of breach and are equipped with two joint holes, insert joint hole through the buckle with rupture piece 2 and slips body 1 fixed connection. Wherein, two buckles also can set up to the pothook of two inside bendings, correspond on the both sides wall of slips body 1 and set up two draw-in grooves, two pothook joints make rupture piece 2 and slips body 1 fixed connection in two draw-in grooves. Fixed through the buckle joint, the dismouting efficiency is improved in the installation of being convenient for and dismantlement.
Or, the both ends of rupture piece 2 are provided with two mounting holes, and the lateral wall that is located breach 11 both sides of slips body 1 corresponds and is equipped with two jacks, penetrates mounting hole and jack through the bolt with rupture piece 2 and slips body 1 fixed connection. Through the bolt grafting fixed, can have the convenient and installation of convenient to assemble of mounting hole 22 processing concurrently and dismantle advantage.
Or, the two ends of the fracture piece 2 are fixedly connected with the side walls of the slip body 1 on the two sides of the notch 11 through welding. When the welding mode is adopted, the installation structures do not need to be additionally arranged on the two ends of the fracture piece 2 and the side walls of the slip body 1, which are positioned on the two sides of the notch 11, the structures of the fracture piece 2 and the slip body 1 can be further simplified, only welding flux needs to be added during connection, and the fixation is relatively firm.
Of course, the connection mode of the slip body 1 and the fracture piece 2 is not limited to the above-mentioned several, and other modes of fixed connection can be selected, which is not limited in this application.
Further, as shown in fig. 2 and fig. 6, grooves 18 matched with the two ends of the fracture piece 2 are formed in the side walls of the slip body 1 located at the two sides of the notch 11, and both the two ends of the fracture piece 2 and the connecting structure between the two ends and the side wall of the slip body 1 (for example, a screw 3-screw hole 17, a buckle-clamping hole, a bolt-insertion hole or a connecting structure between welding lines) can be accommodated in the grooves 18, so that not only the two ends of the fracture piece 2 are conveniently positioned, but also the installation position of the notch of the fracture groove 21 is accurate and not easy to deviate, and the connecting structure is convenient to assemble, so that the two ends of the fracture piece 2 and the connecting structure do not obviously protrude from the side wall surface of the slip body 1, and the slip 100 is ensured to have a simple and beautiful overall appearance.
In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", "axial", "radial", "circumferential", "outer side wall", "end face", "inner side wall", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the structures referred to have specific orientations, configurations and numbers, and thus, are not to be construed as limiting the present invention.
In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "connected," "fixedly connected," "sleeved," and "attached" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected, directly connected, or indirectly connected through an intermediate medium. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A permanent packer slip, comprising:
a C-shaped slip body having a notch;
the two ends of the fracture piece are respectively connected with the slip body and span the gap, and one side of the fracture piece, facing the inner side wall of the slip body, is provided with a fracture groove;
the notch penetrates through the side wall of one side of the slip body along the axial direction and the radial direction of the slip body; the breaking piece can break along the breaking groove.
2. The permanent packer slip of claim 1, wherein:
the breaking piece is arranged into one or more pieces.
3. The permanent packer slip of claim 1, wherein:
the fracture groove penetrates through the side wall of the fracture piece along the axial direction of the slip body.
4. The permanent packer slip of claim 1, wherein:
the slips body includes the link, be provided with connecting portion on the link.
5. The permanent packer slip of claim 4, wherein:
an axial positioning shoulder is arranged on the slip body and close to the connecting part.
6. The permanent packer slip of any one of claims 1-5, wherein:
the fracture groove is U-shaped or V-shaped or C-shaped or semicircular.
7. The permanent packer slip of any one of claims 1-5, wherein:
the fracture piece is in a rectangular strip shape, a waist-shaped strip shape or an oval strip shape.
8. The permanent packer slip of any one of claims 1-5, wherein:
two mounting holes are formed in two ends of the fracture piece, two screw holes are correspondingly formed in the side wall of the slip body, and the fracture piece is fixedly connected with the slip body through screws penetrating through the mounting holes and the screw holes;
or two buckles are arranged at two ends of the fracture piece, two clamping holes are correspondingly arranged on the side wall of the slip body, and the fracture piece is fixedly connected with the slip body by inserting the buckles into the clamping holes;
or two mounting holes are formed in two ends of the fracture piece, two insertion holes are correspondingly formed in the side wall of the slip body, and the fracture piece is fixedly connected with the slip body through inserting pins into the mounting holes and the insertion holes;
or the two ends of the fracture piece are fixedly connected with the side wall of the slip body through welding.
9. The permanent packer slip of any one of claims 1-5, wherein:
grooves matched with the two ends of the breaking pieces are formed in the side walls of the slip body, and the two ends of the breaking pieces are contained in the grooves.
10. The permanent packer slip of any one of claims 1-5, wherein:
the slip comprises a slip body and is characterized in that a plurality of axial grooves are formed in the outer side wall of the slip body at intervals along the circumferential direction, the slip body comprises a working end, the working end can be deformed to be opened outwards, and the axial grooves are located in the positions, along the radial direction, of one end of the working end and penetrate through the side wall of the slip body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810651811.6A CN108868686B (en) | 2018-06-22 | 2018-06-22 | Permanent packer slip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810651811.6A CN108868686B (en) | 2018-06-22 | 2018-06-22 | Permanent packer slip |
Publications (2)
| Publication Number | Publication Date |
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| CN108868686A CN108868686A (en) | 2018-11-23 |
| CN108868686B true CN108868686B (en) | 2021-11-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810651811.6A Active CN108868686B (en) | 2018-06-22 | 2018-06-22 | Permanent packer slip |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111535775B (en) * | 2020-05-21 | 2022-08-30 | 东营市华科石油科技开发有限责任公司 | Adjustable constant pressure washable well packer |
| CN111577166B (en) * | 2020-05-27 | 2022-03-01 | 重庆科技学院 | Novel slips structure |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6302217B1 (en) * | 1998-01-08 | 2001-10-16 | Halliburton Energy Services, Inc. | Extreme service packer having slip actuated debris barrier |
| US10196870B2 (en) * | 2013-11-29 | 2019-02-05 | Halliburton Energy Services, Inc. | External slip having expandable slots and a retainer |
| CN105952412A (en) * | 2016-06-23 | 2016-09-21 | 宝鸡市元亨石油设备有限责任公司 | Saw tooth slip |
| CN206016760U (en) * | 2016-08-30 | 2017-03-15 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | A kind of well completion packer tubbiness formula slips |
| CN206737855U (en) * | 2017-05-12 | 2017-12-12 | 西安石油大学 | A kind of new well completion packer slips |
| CN207111038U (en) * | 2017-06-12 | 2018-03-16 | 西安石油大学 | A kind of permanent packer slips locking device |
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