CN212927745U - Hydraulic centralizer - Google Patents
Hydraulic centralizer Download PDFInfo
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- CN212927745U CN212927745U CN202021903304.6U CN202021903304U CN212927745U CN 212927745 U CN212927745 U CN 212927745U CN 202021903304 U CN202021903304 U CN 202021903304U CN 212927745 U CN212927745 U CN 212927745U
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Abstract
The utility model relates to a downhole tool technical field in the mechanical oil production equipment, concretely relates to hydraulic pressure centralizer, include: a first joint; a second joint; a central tube; the cylinder barrel is sleeved outside the central pipe, and an annular space is formed between the cylinder barrel and the central pipe; the piston is arranged in the annular space and is in sliding sealing fit with the central tube and the cylinder barrel; the liquid inlet hole is arranged on the pipe wall of the central pipe and is communicated with the central pipe and the annular space; a spring plate arranged around a circumference of the center tube; the first connecting sleeve is sleeved outside the central tube and is connected with one end of each spring piece; the second connecting sleeve is sleeved outside the central tube and is connected with the other end of each spring piece; the second connecting sleeve is matched with the piston in a pushing mode and is located outside the cylinder barrel. Has the advantages that: the spring pieces are connected into a whole through the first connecting sleeve and the second connecting sleeve, so that the spring pieces cannot be separated from the hydraulic centralizer, and the normal use of the hydraulic centralizer is ensured; the spring leaf is connected on being independent of the second link outside the cylinder, makes things convenient for the installation of spring leaf.
Description
Technical Field
The utility model relates to a downhole tool technical field in the mechanical oil production equipment, concretely relates to hydraulic pressure centralizer, mainly used oil field development inclined vertical well divides injection tubing to right between two parties.
Background
At present, a rigid centralizer is adopted in domestic oil field development and can be used for centralizing an oil pipe, but the structural reasons have the following defects:
the external diameter size is large, the difficulty of running the pipe string is increased, and the centering of the oil pipe is poor;
secondly, the outer diameter is large, and the well section with large angle of inclination is easy to be blocked.
In order to reduce the running resistance, a rigid centralizer is provided with rollers, but the roller centralizer increases the running difficulty of the pipe string due to large outer diameter; the roller centralizer is short in length and limited in centralizing effect.
The packer in the inclined and straight well must be centered, the defect of uneven stress of a packer rubber sleeve is eliminated, the influence of well inclination on the sealing performance of the tubular column is reduced, and therefore the service life of the tubular column is effectively prolonged.
In view of the above, the chinese utility model with the publication number CN204082032U discloses a hydraulic elastic centralizer, which includes an upper joint, a cylinder sleeve (i.e., a cylinder barrel), and a central tube. The lower end of the upper joint is in threaded connection with the central pipe, the hydraulic cylinder sleeve is in threaded connection with the outer wall of the upper joint, the piston is installed between the central pipe and the hydraulic cylinder sleeve and is sealed with the central pipe and the hydraulic cylinder sleeve through the sealing ring, and the piston and the upper joint are fixed through the pin. The lower end of the piston is pressed against the pushing ring, the inner side of the pushing ring is provided with a check ring, and the check ring is sleeved on the central pipe and meshed with the locking thread on the central pipe. The lower end of the propelling ring is abutted to the spring piece, the spring piece is sleeved on the central tube and is installed between the hydraulic cylinder sleeve and the spring piece base, the spring piece is limited by the key groove in the hydraulic cylinder sleeve and the spring piece base, and the spring piece base is connected to the lower end of the central tube.
When the centralizer is used, the spring piece is in an unfolded state in the process of descending the well. After the design degree of depth was assigned to the casing cluster, to intraductal the suppressing, when pressure reached a definite value, the pin was cut, and the piston receives hydraulic pressure down, promotes the stopping ring, impels the ring, and then makes the spring leaf expand by compressing, forms cage structure, and the spring leaf of expanding pastes on the wall of a well, and the casing that originally lies on wall of a well one side because of the action of gravity is skew under the effect of spring leaf elasticity, forms the passageway of continuous grout circulation. The check ring moves in a single direction and is reliably meshed with the locking thread on the central pipe, so that the spring piece is always in a compressed state and cannot be positioned, and the hydraulic centralizer is ensured to have a good centralizing effect. The mode that the piston pushes the spring piece to centralize is adopted, so that the casing string centralizing device has the advantages of being sufficient in centralizing rigidity, good in centralizing effect and capable of reducing, the casing string descending difficulty is greatly reduced, the spring piece is large in compression expansion outer diameter, the casing string centralizing device can centralize a casing string in an irregular borehole and an expanded borehole, and well cementation quality is improved.
However, because the spring pieces are arranged in the cylinder barrel and the key grooves of the spring piece base one by one, if the stroke of the piston is not well controlled during use, the spring pieces are easily pushed out completely, and then the spring pieces can be separated from the centralizer, so that the normal use performance of the centralizer is influenced. Simultaneously, because the space between cylinder and spring leaf base and the center tube is very narrow and small, lead to the installation of spring leaf very inconvenient.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a hydraulic pressure centralizer to solve the spring leaf among the current centralizer one slice of installing between cylinder and center tube and install in the keyway of cylinder and lead to installing inconvenient problem and spring leaf easily by the piston ejecting, thereby break away from, influence the problem of the normal use performance of centralizer with the centralizer.
In order to achieve the above object, the utility model provides a hydraulic centralizer adopts following technical scheme:
a hydraulic centralizer, comprising:
the first joint is positioned at one end of the hydraulic centralizer;
the second joint is positioned at the other end of the hydraulic centralizer;
a center tube connected between the first joint and the second joint;
the cylinder barrel is sleeved outside the central tube, and an annular space is formed between the cylinder barrel and the central tube;
the piston is arranged in the annular space and is in sliding sealing fit with the central pipe and the cylinder barrel;
the liquid inlet hole is formed in the pipe wall of the central pipe and is communicated with the central pipe and the annular space;
the spring pieces are at least three and are arranged around the circumference of the central tube;
the hydraulic centralizer still includes:
the first connecting sleeve is sleeved outside the central tube and is connected with one end of each spring piece;
the second connecting sleeve is sleeved outside the central tube and is connected with the other end of each spring piece;
wherein, the first connecting sleeve is arranged close to the first joint, the second connecting sleeve is arranged close to the second joint and the cylinder barrel, the second connecting sleeve is matched with the piston in a pushing way, and the second connecting sleeve is positioned outside the cylinder barrel.
The beneficial effects of the above technical scheme are that: the first connecting sleeve and the second connecting sleeve are arranged, the first connecting sleeve is connected with one end of each spring piece, the second connecting sleeve is connected with the other end of each spring piece, the spring pieces are connected into a whole through the first connecting sleeve and the second connecting sleeve, the first connecting sleeve and the second connecting sleeve are sleeved outside the central tube, the problem that a single spring piece is jacked down can not occur, namely, each spring piece can not be separated from the hydraulic centralizer, and therefore the normal use performance of the hydraulic centralizer can be guaranteed.
In addition, the first connecting sleeve is arranged close to the first joint, the second connecting sleeve is arranged close to the second joint and the cylinder barrel, and the second connecting sleeve is in pushing fit with the piston, so that when the piston pushes the second connecting sleeve to move, under the matching action of the first connecting sleeve, each spring piece can be expanded, and the centering function of the hydraulic centralizer is realized. Simultaneously because the second adapter sleeve is located the outside of cylinder, the tip of spring leaf links to each other with the second adapter sleeve, compares and installs in the narrow and small space between cylinder and center tube among the prior art, the utility model discloses a spring leaf is connected on a part independently outside the cylinder, can make things convenient for the installation of spring leaf more.
Furthermore, the first connecting sleeve and the second connecting sleeve are respectively arranged with the spring piece in a split mode.
The beneficial effects of the above technical scheme are that: the first connecting sleeve, the second connecting sleeve and the spring piece are convenient to process and manufacture.
Furthermore, caulking grooves for embedding the end parts of the spring leaves are respectively arranged on the outer peripheral surfaces of the first connecting sleeve and the second connecting sleeve.
The beneficial effects of the above technical scheme are that: the installation of the spring piece is convenient.
Furthermore, a first press ring is fixed outside the first connecting sleeve and used for pressing and fixing one end part of the spring piece on the first connecting sleeve, a second press ring is fixed outside the second connecting sleeve and used for pressing and fixing the other end part of the spring piece on the second connecting sleeve.
The beneficial effects of the above technical scheme are that: the convenient one end to the spring leaf of first clamping ring is fixed, and the convenient other end to the spring leaf of second clamping ring is fixed.
Furthermore, the two ends of the spring piece are respectively provided with a flanging extending towards the central pipe, the first connecting sleeve and the second connecting sleeve are respectively provided with a slot for inserting the flanging, the slot is positioned at one end of the caulking groove, and the depth of the slot is greater than that of the caulking groove.
The beneficial effects of the above technical scheme are that: the two ends of the spring piece are well limited, and the spring piece is prevented from being separated from the first connecting sleeve and the second connecting sleeve along the axial direction.
Furthermore, the outer wall of the central tube is provided with a limiting step for limiting the moving limit of the second connecting sleeve.
The beneficial effects of the above technical scheme are that: the moving limit of the second connecting sleeve is limited, so that the second connecting sleeve is prevented from moving excessively to cause the transition deformation of the spring piece, the resetting of the spring piece is influenced, the scrapping of the spring piece is caused, and the smooth pulling-out of the pipe column is further influenced.
Further, the cylinder and the second joint are integrally connected.
The beneficial effects of the above technical scheme are that: the processing, the manufacturing and the installation are convenient.
Furthermore, at least two sealing rings are respectively arranged between the piston and the central pipe and between the piston and the cylinder barrel.
The beneficial effects of the above technical scheme are that: at least two sealing rings can guarantee sealing performance, and high-pressure liquid is prevented from leaking when the sealing ring is pressed.
Furthermore, the end part of the central tube is fixedly connected in the first joint, and the end surface of the first joint is in stop fit with the first connecting sleeve.
The beneficial effects of the above technical scheme are that: the first connecting sleeve is convenient to limit, so that the first connecting sleeve is better matched with the second connecting sleeve.
Further, the center tube is in threaded connection with the first joint, and a sealing ring is arranged between the center tube and the first joint.
The beneficial effects of the above technical scheme are that: the connection between the central pipe and the first joint is facilitated, and meanwhile, the sealing performance is guaranteed.
Drawings
FIG. 1 is a structural diagram of an embodiment 1 of the hydraulic centralizer according to the present invention;
FIG. 2 is an enlarged view taken at A in FIG. 1;
fig. 3 is an enlarged view at B in fig. 1.
In the figure:
1-a first linker;
2-a first sealing ring;
3-a first connecting sleeve;
4-a first pressure ring;
5-a first screw;
6-a central tube;
61-a limit step;
62-liquid inlet hole;
7-spring leaf;
71-flanging;
8-a second connecting sleeve;
81-caulking groove;
82-slot;
9-a second pressure ring;
10-a piston;
11-a second sealing ring;
12-a third sealing ring;
13-a second linker;
131-a cylinder barrel;
14 annular space.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the described embodiments are only some, but not all embodiments of the invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The features and properties of the present invention are described in further detail below with reference to examples.
The utility model discloses embodiment 1 of well hydraulic pressure centralizer is as shown in figure 1, connect 13 including first joint 1, center tube 6, second, first joint 1 is located the one end of hydraulic pressure centralizer, and second joint 13 is located the other end of hydraulic pressure centralizer, and center tube 6 is connected between first joint 1 and second joint 13.
The first joint 1 is in threaded connection with the central pipe 6, specifically, the end of the central pipe 6 is fixedly connected in the first joint 1, a convex ring is arranged on the inner wall of the first joint 1, and the end of the central pipe 6 is in stop fit with the convex ring. In addition, a first sealing ring 2 is arranged between the central tube 6 and the first joint 1 to ensure sealing performance.
The second joint 13 is also screwed to the central tube 6, and the end of the central tube 6 is fixedly connected inside the second joint 13. Referring to fig. 3, the second joint 13 includes an integrally extending cylinder 131, the cylinder 131 is disposed outside the central tube 6, and an annular space 14 is formed between the cylinder 131 and the central tube 6. The pipe wall of the central pipe 6 is provided with a liquid inlet hole 62, and the liquid inlet hole 62 is communicated with the central pipe 6 and the annular space 14.
A piston 10 is arranged in the annular space 14, the piston 10 is in sliding sealing fit with the central pipe 6 and the cylinder 131, and as shown in fig. 1, in order to ensure the sealing performance, three second sealing rings 11 are arranged between the piston 10 and the central pipe 6, two third sealing rings 12 are arranged between the piston 10 and the cylinder 131, and the second sealing rings 11 and the third sealing rings 12 are arranged in a staggered manner in the axial direction.
As shown in fig. 1, the outer sleeve of the center tube 6 is provided with a first connection sleeve 3 and a second connection sleeve 8, the first connection sleeve 3 is disposed near the first joint 1, and the second connection sleeve 8 is disposed near the cylinder 131 of the second joint 13. The hydraulic centralizer further comprises at least three spring strips 7 uniformly arranged around the circumference of the central tube 6, preferably six spring strips 7, each spring strip 7 having an arcuate shape.
One end of each spring plate 7 is connected to the first connecting sleeve 3, and the other end is connected to the second connecting sleeve 8, specifically, caulking grooves for embedding the end portions of the spring plates 7 are respectively arranged on the outer peripheral surfaces of the first connecting sleeve 3 and the second connecting sleeve 8, as shown in fig. 2, the caulking groove 81 is arranged on the second connecting sleeve 8, the caulking groove 81 extends along the axial direction, the end portion of the caulking groove 81 is provided with a slot 82 communicated with the caulking groove 81, the slot 82 extends along the radial direction, and the depth of the slot 82 is greater than that of the caulking groove 81.
In order to fix the spring plate 7 so as to prevent the spring plate from being separated from the first connecting sleeve 3 and the second connecting sleeve 8 along the radial direction, a first pressing ring 4 is fixed outside the first connecting sleeve 3 through a first screw 5, and the first pressing ring 4 is used for pressing and fixing one end part of the spring plate 7 on the first connecting sleeve 3. Meanwhile, a second press ring 9 is fixed outside the second connecting sleeve 8 by a second screw (not shown in the figure), and the second press ring 9 is used for pressing and fixing the other end of the spring piece 7 on the second connecting sleeve 8. The first screw 5 allows the spring piece 7 to be fixedly connected with the first connecting sleeve 3, and the second screw also allows the spring piece 7 to be fixedly connected with the second connecting sleeve 8, so that holes do not need to be formed in the spring piece 7, and the processing, the manufacturing and the installation are convenient.
The utility model provides a hydraulic pressure centralizer, the terminal surface and the 3 stop cooperations of first adapter sleeve of first joint 1, the first adapter sleeve 3 of restriction to the removal limit of first joint 1 direction, the cooperation is pushed up with piston 10 top to the second adapter sleeve 8, when piston 10 removed, can promote the direction removal of second adapter sleeve 8 to first adapter sleeve 3 to extrusion spring leaf 7 makes spring 7 expand. Meanwhile, the outer wall of the central tube 6 is provided with a limiting step 61 for limiting the movement limit of the second connecting sleeve 8, as shown in fig. 2, the limiting step 61 can prevent the second connecting sleeve from moving excessively to cause the transition deformation of the spring piece 7, which affects the resetting of the spring piece 7 and the scrapping of the spring piece 7, and further affects the smooth pulling-out of the tubular column.
When the hydraulic centralizer is used, the outer diameter of the hydraulic centralizer in the initial state is the minimum, and the spring piece 7 is not expanded. The hydraulic centralizer is connected to the tool string with the first sub 1 as the top sub and the second sub 13 as the bottom sub, and then lowered together into the intended well depth. The oil pipe is used for pressurizing the interior of the hydraulic centralizer, high-pressure liquid enters the annular space 14 through the liquid inlet hole 62, so that the piston 10 is pushed to move, the piston 10 pushes the second connecting sleeve 8, the spring piece 7 arches outwards and expands and pushes the spring piece to the well wall under the extrusion effect of the second connecting sleeve 8 and the first connecting sleeve 3, the outer diameter of the hydraulic centralizer is increased, and the effect of centralizing the oil pipe in the middle is achieved. The hydraulic centralizer keeps the arching expansion state continuously under the internal pressure of the oil pipe; the pressure in the oil pipe is reduced, the spring piece 7 is gradually reset to push the piston 10 to return, the outer diameter of the hydraulic centralizer is gradually reduced, and when the pressure difference is nearly eliminated, the hydraulic centralizer is restored to the initial state, so that the hydraulic centralizer can be repeatedly used, and the smooth pulling-out of the pipe column is not influenced.
The utility model provides a hydraulic pressure centralizer, each spring leaf have been linked into a whole through first adapter sleeve and second adapter sleeve to first adapter sleeve and second adapter sleeve are all established and are established in the outside of center tube, just so can not appear the problem that single spring leaf was pushed up again, also each spring leaf can not break away from with hydraulic pressure centralizer promptly, thereby can guarantee hydraulic pressure centralizer's normal performance. Simultaneously because the second adapter sleeve is located the outside of cylinder, the tip of spring leaf links to each other with the second adapter sleeve, compares and installs in the narrow and small space between cylinder and center tube among the prior art, the utility model discloses a spring leaf is connected on a part independently outside the cylinder, can make things convenient for the installation of spring leaf more.
The utility model discloses a hydraulic pressure centralizer design is simple and convenient, and the structure is reliable, and it is effectual to right, can prolong the life of tubular column, saves a large amount of funds. Through a plurality of tests in operation and construction, the safety factor and the construction progress of construction operation are generally improved.
The utility model discloses embodiment 2 of well hydraulic pressure centralizer: the main difference from embodiment 1 is that the second joint is an upper joint and the first joint is a lower joint, and the whole operation principle is the same as that of embodiment 1.
The utility model discloses embodiment 3 of well hydraulic pressure centralizer: the main difference from embodiment 1 is that the central tube is welded to the first joint, in which case the sealing ring between the central tube and the first joint can be omitted.
The utility model discloses embodiment 4 of well hydraulic pressure centralizer: the main difference from embodiment 1 is that the central tube is fixedly connected to the outside of the first joint, and a protruding ring is arranged on the outer wall of the central tube to be in stop fit with the first connecting sleeve.
The utility model discloses embodiment 5 of well hydraulic pressure centralizer: the main difference from example 1 is that the first connection sleeve is directly fixedly connected to the central tube.
The utility model discloses embodiment 6 of well hydraulic pressure centralizer: the main difference from embodiment 1 is that there are two or four or more sealing rings between the piston and the central tube, but of course there may be only one sealing ring.
The utility model discloses embodiment 7 of well hydraulic pressure centralizer: the main difference from embodiment 1 is that there are three or four or more sealing rings between the piston and the cylinder, but only one sealing ring is possible.
The utility model discloses embodiment 8 of well hydraulic pressure centralizer: the main difference from embodiment 1 is that the cylinder is provided separately from the second connection and the cylinder is additionally screwed onto the second connection or the central tube.
The utility model discloses embodiment 9 of well hydraulic pressure centralizer: the main difference from the embodiment 1 is that the outer wall of the central tube is not provided with a limit step, and the moving distance of the piston is controlled by controlling the pressing pressure.
The utility model discloses embodiment 10 of well hydraulic pressure centralizer: the main difference from the embodiment 1 is that two ends of the spring piece are not provided with flanges, the spring piece is directly fixed and limited on the corresponding connecting sleeve by the pressing ring, and at the moment, slots on the two connecting sleeves can be omitted.
The utility model discloses embodiment 11 of well hydraulic pressure centralizer: the main difference from embodiment 1 is that the two ends of the spring piece are directly fixed on the corresponding connecting sleeves through screws, so that the first pressing ring and the second pressing ring are omitted, and the two ends of the spring piece can also be welded and fixed on the corresponding connecting sleeves.
The utility model discloses embodiment 12 of well hydraulic pressure centralizer: the main difference from embodiment 1 is that the caulking grooves of the first and second connection sleeves are provided on the inner peripheral surface, and in this case, the spring piece end portions need to be fixed to the corresponding connection sleeves by screws.
The utility model discloses embodiment 13 of well hydraulic pressure centralizer: the main difference from embodiment 1 is that the first and second connection sleeves are not provided with caulking grooves, and the spring pieces are directly fixed to the outer peripheral surfaces of the first and second connection sleeves, for example, by screws or welding.
The utility model discloses embodiment 14 of well hydraulic pressure centralizer: the main difference from embodiment 1 is that the first and second connection sleeves are formed integrally with the spring piece which is cut out from a cylindrical member.
The utility model discloses embodiment 15 of well hydraulic pressure centralizer: the main difference from embodiment 1 is that the spring pieces are provided with three, four, five or more, and the spring pieces are not circumferentially arranged evenly.
The above description is only for the preferred embodiment of the present invention, and the present invention is not limited thereto, the protection scope of the present invention is defined by the claims, and all structural changes equivalent to the contents of the description and drawings of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A hydraulic centralizer, comprising:
the first joint is positioned at one end of the hydraulic centralizer;
the second joint is positioned at the other end of the hydraulic centralizer;
a center tube connected between the first joint and the second joint;
the cylinder barrel is sleeved outside the central tube, and an annular space is formed between the cylinder barrel and the central tube;
the piston is arranged in the annular space and is in sliding sealing fit with the central pipe and the cylinder barrel;
the liquid inlet hole is formed in the pipe wall of the central pipe and is communicated with the central pipe and the annular space;
the spring pieces are at least three and are arranged around the circumference of the central tube;
its characterized in that, hydraulic pressure centralizer still includes:
the first connecting sleeve is sleeved outside the central tube and is connected with one end of each spring piece;
the second connecting sleeve is sleeved outside the central tube and is connected with the other end of each spring piece;
wherein, the first connecting sleeve is arranged close to the first joint, the second connecting sleeve is arranged close to the second joint and the cylinder barrel, the second connecting sleeve is matched with the piston in a pushing way, and the second connecting sleeve is positioned outside the cylinder barrel.
2. The hydraulic centralizer of claim 1, wherein the first and second connecting sleeves are each separate from the spring plate.
3. The hydraulic centralizer of claim 2, wherein the first and second connection sleeves are provided on outer circumferential surfaces thereof with caulking grooves into which ends of the spring pieces are fitted, respectively.
4. The hydraulic centralizer of claim 3, wherein a first press ring is fixed outside the first connecting sleeve and used for pressing and fixing one end part of the spring piece on the first connecting sleeve, a second press ring is fixed outside the second connecting sleeve and used for pressing and fixing the other end part of the spring piece on the second connecting sleeve.
5. The hydraulic centralizer of claim 4, wherein flanges extending towards the central tube are respectively arranged at two ends of the spring piece, slots for the flanges to insert are respectively arranged on the first connecting sleeve and the second connecting sleeve, the slots are located at one end of the embedded groove, and the depth of the slots is larger than that of the embedded groove.
6. The hydraulic centralizer according to any one of claims 1 to 5, wherein a limiting step for limiting the movement limit of the second connecting sleeve is arranged on the outer wall of the central tube.
7. The hydraulic centralizer of any of claims 1-5 wherein the cylinder and the second joint are integrally connected.
8. The hydraulic centralizer according to any one of claims 1 to 5, wherein at least two sealing rings are respectively arranged between the piston and the central tube and between the piston and the cylinder barrel.
9. The hydraulic centralizer of any of claims 1-5 wherein the end of the center tube is fixedly attached within the first joint and the end face of the first joint is in stop-fit engagement with the first joint sleeve.
10. The hydraulic centralizer of claim 9, wherein the base pipe is threadably connected to the first sub, and a seal ring is disposed between the base pipe and the first sub.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021903304.6U CN212927745U (en) | 2020-09-03 | 2020-09-03 | Hydraulic centralizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021903304.6U CN212927745U (en) | 2020-09-03 | 2020-09-03 | Hydraulic centralizer |
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| Publication Number | Publication Date |
|---|---|
| CN212927745U true CN212927745U (en) | 2021-04-09 |
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| CN202021903304.6U Active CN212927745U (en) | 2020-09-03 | 2020-09-03 | Hydraulic centralizer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116624109A (en) * | 2023-07-25 | 2023-08-22 | 成都阿斯贝瑞科技有限公司 | Multi-pitching variable-diameter hydraulic centralizer |
-
2020
- 2020-09-03 CN CN202021903304.6U patent/CN212927745U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116624109A (en) * | 2023-07-25 | 2023-08-22 | 成都阿斯贝瑞科技有限公司 | Multi-pitching variable-diameter hydraulic centralizer |
| CN116624109B (en) * | 2023-07-25 | 2023-09-19 | 成都阿斯贝瑞科技有限公司 | Multi-pitching variable-diameter hydraulic centralizer |
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