CN217501612U - Full-sealed hydraulic cutting knife started by throwing ball - Google Patents
Full-sealed hydraulic cutting knife started by throwing ball Download PDFInfo
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- CN217501612U CN217501612U CN202220362915.7U CN202220362915U CN217501612U CN 217501612 U CN217501612 U CN 217501612U CN 202220362915 U CN202220362915 U CN 202220362915U CN 217501612 U CN217501612 U CN 217501612U
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Abstract
The utility model provides a totally enclosed water conservancy cutting knife that bowling started, the tail end of top connection links to each other with the head end of body, the tail end of body links to each other with the head end of bottom connection, the ball seat sets up between the lower terminal surface of top connection and the up end inner wall step of body, the dabber sets up in this body, and form a rack structure on the middle part outer wall of dabber, form the blade groove on the lateral wall of body, the blade is installed at the blade inslot, the upper portion towards the blade of dabber one side forms a gear structure, rack structure and gear structure meshing, form a piston step on the lower part outer wall of dabber, inner wall at the bottom connection forms one and keeps off the ring step, piston has set gradually from top to bottom between piston step and fender ring step, the spring with keep off the ring. The inner cavity of the hydraulic cutting knife is continuously and continuously closed, all fluid entering the system can completely penetrate through the cutting knife and cannot escape, and the pressure integrity of pumping operation is guaranteed.
Description
Technical Field
The utility model relates to an oil gas exploration exploitation technical field, more specifically say and relate to a totally enclosed water conservancy cutting knife of bowling start-up.
Background
In the process of oil and gas exploration and exploitation, some oil and gas wells with longer service life may need to be discarded due to the reasons of yield reduction, high water content, potential safety hazards and the like. Among them, casing cutting is one of the most important operations in oil and gas well abandonment, and the methods of casing cutting can be broadly classified into mechanical cutting, chemical cutting, explosive cutting, abrasive jet cutting, and the like. Wherein, the hydraulic cutter is a conventional tool used for mechanical cutting.
In the prior patents CN 107288566A, CN 108915629 a and CN 107191150B, the general working principle of the conventional hydraulic cutter at present is to pump fluid from a drilling tool to the hydraulic cutter at a certain displacement, and the inside of the hydraulic cutter is usually provided with a nozzle, and the fluid flows through the nozzle at a certain displacement to cause differential pressure throttling to generate a downward thrust to push a piston or a similar mechanism to move downward. During the downward movement, the blades are radially expanded to contact the pipe (casing) to be cut, and then the cutting is completed by rotating the cutter.
The existing hydraulic cutting knife has two defects: firstly, due to the existence of the nozzle on the main flow channel, the flow area inside the whole cutting knife is small, the pumping displacement of the fluid is sensitive, and once a certain fluid displacement is established, the blade can be opened towards the radial direction. Second, most existing conventional hydraulic cutter designs do not have pressure integrity and pumped fluid can escape from the blade or elsewhere after flowing through the nozzle. When special operations (such as one-time implementation of cement plug beating and casing cutting) need to pump fluid to a certain displacement below a hydraulic cutter (at the moment, the blade is not required to be opened), and the blade is opened radially after the pumping step is completed for cutting, the conventional hydraulic cutter is difficult to implement.
SUMMERY OF THE UTILITY MODEL
The utility model overcomes not enough among the prior art, current water conservancy cutting knife has the unable big discharge capacity pump to annotate and the inside problem that does not have pressure integrality of cutting knife, provides a totally enclosed water conservancy cutting knife that the bowling started, and the inner chamber of this water conservancy cutting knife continues to link up the closure, and all fluid that get into the system all can run through completely, can not the loss, has guaranteed the pressure integrality of pump injection operation.
The purpose of the utility model is realized by the following technical scheme.
A totally-enclosed hydraulic cutter started by throwing a ball, which comprises an upper joint, a body, a ball seat, a mandrel and a lower joint,
the tail end of the upper joint is connected with the head end of the body, the tail end of the body is connected with the head end of the lower joint, the ball seat is arranged between the lower end face of the upper joint and the step on the inner wall of the upper end face of the body, the mandrel is arranged in the body, a rack structure is formed on the outer wall of the middle of the mandrel, a blade groove is formed on the side wall of the body, a blade is arranged in the blade groove, a gear structure is formed on the upper portion of the blade facing one side of the mandrel, the rack structure is meshed with the gear structure, the purpose of driving the blade to radially recover or open along the body is achieved by moving the mandrel along the body, a piston step is formed on the outer wall of the lower portion of the mandrel, a baffle ring step is formed on the inner wall of the lower joint, and a piston and a baffle ring are sequentially arranged between the piston step and the baffle ring step from top to bottom, The piston is always contacted with the piston step under the action of the spring, and the baffle ring is always contacted with the baffle ring step under the action of the spring, so that the aim of resetting the mandrel pressed by force after losing the downward acting force is fulfilled;
a ball seat expanding section is formed on the outer wall of the middle part of the ball seat, a through notch penetrating through the side wall of the ball seat is formed on the side wall of the ball seat above the ball seat expanding section, an axial through hole penetrating through the ball seat expanding section is formed on the ball seat expanding section, a starting ball chamfering structure is formed on the inner wall of the ball seat, and the starting ball chamfering structure is used for receiving a starting ball;
an inclined through hole is formed in the upper end face of the mandrel, one end of the inclined through hole is located at the upper end face of the mandrel, the other end of the inclined through hole is communicated with the inner cavity of the mandrel, and a nozzle is arranged in the inclined through hole.
The blades are rotatably connected with the blade grooves through hinge pins, the number of the blades is 3, and the blades are uniformly distributed along the circumferential direction of the body.
The number of the through notches is 6, the through notches are uniformly distributed along the circumferential direction of the ball seat, the number of the axial through holes is 6, and the axial through holes are uniformly distributed along the circumferential direction of the ball seat.
The quantity of oblique through-hole is 3, and oblique through-hole is along the circumference evenly distributed of dabber.
The top connection with realize sealedly through the top connection is sealed between the body, the body with realize sealedly through the lower clutch is sealed between the lower clutch, the dabber with realize sealedly through the dabber is sealed between the body.
The stop ring and the mandrel are sealed through piston inner seal, the stop ring and the body are sealed through piston outer seal, and the stop ring and the lower joint are sealed through the stop ring.
The utility model has the advantages that: (1) when the starting ball is not thrown, the internal flow passage area of the invention is large, and fluid is allowed to be pumped without causing the blades to open radially. Other operations needing pumping can be completed before the hydraulic cutter is activated, so that multiple operations can be completed by one string, and time and cost are saved;
(2) the utility model discloses an inner chamber continuously links up sealedly, and all fluids that get into the system all can run through completely and pass through, can not the loss, have guaranteed the pressure integrality of pump injection operation.
Drawings
FIG. 1 is a state diagram of the hydraulic cutter of the present invention when the start ball is not thrown in;
FIG. 2 is a state diagram of the hydraulic cutter of the utility model when the starting ball is put in;
FIG. 3 is a schematic view of the structure of the ball seat of the present invention;
fig. 4 is a schematic structural view of the central spindle and the nozzle thereof according to the present invention;
in the figure: 1 is an upper joint, 2 is a ball seat, 3 is a mandrel, 4 is a body, 5 is a piston, 6 is a retaining ring, 7 is a lower joint, 8 is a hinge pin, 9 is a spring, 11 is a blade, 12 is a nozzle, 16 is a piston inner seal, 17 is a piston outer seal, 18 is a retaining ring seal, 19 is a lower joint seal, 20 is a mandrel seal, 21 is an upper joint seal, 22 is a nozzle seal, and 23 is a starting ball.
For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.
Detailed Description
The technical solution of the present invention is further explained by the following specific examples.
As shown in figures 1 to 4, the totally enclosed hydraulic cutter started by throwing the ball comprises an upper joint 1, a body 4, a ball seat 2, a mandrel 3 and a lower joint 7,
the tail end of the upper joint 1 is connected with the head end of the body 4, the tail end of the body 4 is connected with the head end of the lower joint 7, the ball seat 2 is arranged between the lower end face of the upper joint 1 and the step of the inner wall of the upper end face of the body 4, the mandrel 3 is arranged in the body 4, a rack structure is formed on the outer wall of the middle part of the mandrel 3, a blade groove is formed on the side wall of the body 4, a blade 11 is arranged in the blade groove, a gear structure is formed on the upper part of the blade facing one side of the mandrel 3, the rack structure is meshed with the gear structure, the purpose of driving the blade 11 to be radially recovered or opened along the body 4 is realized by the movement of the mandrel 3 along the body 4, a piston step is formed on the outer wall of the lower part of the mandrel 3, a baffle ring step is formed on the inner wall of the lower joint 7, a piston 5, a spring 9 and a baffle ring 6 are sequentially arranged between the piston step and the baffle ring step from top to bottom, the piston 5 is always contacted with the piston step under the action of the spring 9, the baffle ring 6 is always contacted with the baffle ring step under the action of the spring 9, so that the aim of resetting the mandrel 3 pressed downwards under stress after losing the downward acting force is fulfilled;
a ball seat expanding section is formed on the outer wall of the middle part of the ball seat 2, a through notch penetrating through the side wall of the ball seat is formed on the side wall of the ball seat above the ball seat expanding section, an axial through hole penetrating through the ball seat expanding section is formed on the ball seat expanding section, and a starting ball chamfering structure is formed on the inner wall of the ball seat and is used for receiving a starting ball 23;
an inclined through hole is formed in the upper end face of the mandrel 3, one end of the inclined through hole is located at the upper end face of the mandrel 3, the other end of the inclined through hole is communicated with the inner cavity of the mandrel 3, and a nozzle 12 is arranged in the inclined through hole.
The blades 11 are rotatably connected with the blade grooves through hinge pins 8, the number of the blades 11 is 3, and the blades 11 are uniformly distributed along the circumferential direction of the body 4.
The quantity of through notch is 6, and through notch along ball seat 2's circumference evenly distributed, and the quantity of axial through hole is 6, and axial through hole along ball seat 2's circumference evenly distributed.
The quantity of oblique through-hole is 3, and oblique through-hole is along the circumference evenly distributed of dabber 3.
The upper joint 1 and the body 4 are sealed through an upper joint seal 21, the body 4 and the lower joint 7 are sealed through a lower joint seal 19, and the mandrel 3 and the body 4 are sealed through a mandrel seal 20.
The baffle ring 6 and the mandrel 3 are sealed through a piston inner seal 16, the baffle ring 6 and the body 4 are sealed through a piston outer seal 17, and the baffle ring 6 and the lower joint 7 are sealed through a baffle ring seal 18.
When the hydraulic cutting knife is used, the hydraulic cutting knife is conveyed to a designated position of a shaft from a drill rod, at the moment, a starting ball is not put in temporarily, the state of the hydraulic cutting knife is as shown in figure 1, when pumping starts, fluid passes through the drill rod from an upper connector 1 to enter the hydraulic cutting knife at a certain discharge capacity, and at the moment, two flow channels (hereinafter referred to as a flow channel I and a flow channel II) exist in an inner cavity of the hydraulic cutting knife:
the fluid movement process in the first flow channel is as follows: most of the fluid flows through the inner cavity of the upper joint 1, the inner cavity of the ball seat 2, the inner cavity of the mandrel 3, the inner cavity of the baffle ring 6 and finally leaves the hydraulic cutter until reaching the inner cavity of the lower joint 7.
The fluid movement process in the second flow channel is as follows: a small part of fluid can flow through straight-through notches which are uniformly distributed in the circumferential direction on the ball seat 2, axial through holes (the ball seat structure is shown in figure 3) which are uniformly distributed in the circumferential direction on the diameter expansion section of the ball seat enter a nozzle 12 (shown in figure 4) which is arranged on an inclined through hole of the mandrel, and after throttling through the nozzle 12, the fluid flows through the inclined through hole to enter an inner cavity of the mandrel 3, then sequentially flows through an inner cavity of the baffle ring 6 and an inner cavity of the lower connector 7 and finally leaves the hydraulic cutter.
In the two flow passages, an upper joint seal 21, a mandrel seal 20, a piston inner seal 16, a piston outer seal 17, a lower joint seal 19 and a baffle ring seal 18 are used for ensuring the pressure integrity in the hydraulic cutter.
Because the nozzle 12 in the second flow passage has a strong throttling function, most of the fluid can pass through the first flow passage with a larger flow passing area, the fluid flowing through the second flow passage is less, the throttling pressure difference of the mandrel 3 is not enough to overcome the downward movement of the spring 9, so that the rack and pinion meshing relation is not activated to radially open the blade 11, and whether the nozzle 12 is installed on each inclined through hole or not can be selectively placed according to actual requirements.
When the pumping operation is completed, the cutting blade 11 needs to be radially expanded to contact with the pipe to be cut for cutting. At this time, the starting ball 23 is pumped from the ground equipment together with the fluid, when the starting ball 23 reaches the hydraulic cutter along with the pumped fluid, the starting ball 23 is seated in the starting ball chamfering structure, the flow passage in the inner cavity of the ball seat is blocked, further the flow passage I is blocked, all the fluid entering the hydraulic cutter is guided to the flow passage II, when the fluid in the flow passage II reaches a certain displacement, the throttling pressure difference caused by the nozzle 12 acts on the top end surface of the mandrel 3, the lower pushing force formed by the throttling pressure difference is enough to overcome the elastic force of the spring 9, further the mandrel 3 pushes the piston 5 to move downwards, the rack and pinion mechanism between the mandrel 3 and the blade 11 drives the blade 11 to open radially to contact with the sleeve in the downward moving process of the mandrel 3, the cutting operation can be started, the upward and downward moving strokes of the piston 5 are respectively limited by the outer surface bulge of the ball seat 2 and the step of the inner wall of the body 4, when the piston 5 reaches the lower limit of the travel, the diameter of the radial opening of the blade 11 reaches a maximum, corresponding to the maximum external diameter of the pipe to be cut, as shown in fig. 2.
When the blade 11 needs to be retracted, the pump can be lowered to a certain displacement, the throttling pressure difference acting on the top end face of the mandrel 3 is not enough to overcome the upper jacking force of the spring 9, the spring 9 pushes the contact surface with the piston 5 to move upwards at the moment, the mandrel 3 is further driven to move upwards, the blade 11 is driven to retract into the blade groove by the meshing relationship of the rack and the gear of the mandrel 3 and the blade 11 in the process, and when the mandrel 3 moves to the upper limit of the stroke, the blade 11 is completely retracted into the blade groove.
Spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used in the embodiments for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.
The present invention has been described in detail, but the above description is only a preferred embodiment of the present invention, and should not be construed as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should still fall within the patent coverage of the present invention.
Claims (6)
1. The utility model provides a totally enclosed water conservancy cutting knife that bowling started which characterized in that: comprises an upper joint, a body, a ball seat, a mandrel and a lower joint,
the tail end of the upper joint is connected with the head end of the body, the tail end of the body is connected with the head end of the lower joint, the ball seat is arranged between the lower end face of the upper joint and the step of the inner wall of the upper end face of the body, the mandrel is arranged in the body, a rack structure is formed on the outer wall of the middle part of the mandrel, a blade groove is formed on the side wall of the body, a blade is arranged in the blade groove, a gear structure is formed on the upper part of the blade facing one side of the mandrel, the rack structure is meshed with the gear structure, a piston step is formed on the outer wall of the lower part of the mandrel, a retaining ring step is formed on the inner wall of the lower joint, and a piston, a spring and a retaining ring are sequentially arranged between the piston step and the retaining ring step from top to bottom;
a ball seat expanding section is formed on the outer wall of the middle part of the ball seat, a through notch penetrating through the side wall of the ball seat is formed on the side wall of the ball seat above the ball seat expanding section, an axial through hole penetrating through the ball seat expanding section is formed on the ball seat expanding section, a starting ball chamfering structure is formed on the inner wall of the ball seat, and the starting ball chamfering structure is used for receiving a starting ball;
an inclined through hole is formed in the upper end face of the mandrel, one end of the inclined through hole is located at the upper end face of the mandrel, the other end of the inclined through hole is communicated with the inner cavity of the mandrel, and a nozzle is arranged in the inclined through hole.
2. The totally enclosed hydraulic cutter started by throwing the ball as claimed in claim 1, wherein: the blades are rotatably connected with the blade grooves through hinge pins, the number of the blades is 3, and the blades are uniformly distributed along the circumferential direction of the body.
3. The totally enclosed hydraulic cutter started by pitching the ball according to claim 1, characterized in that: the number of the through notches is 6, the through notches are uniformly distributed along the circumferential direction of the ball seat, the number of the axial through holes is 6, and the axial through holes are uniformly distributed along the circumferential direction of the ball seat.
4. The totally enclosed hydraulic cutter started by pitching the ball according to claim 1, characterized in that: the quantity of oblique through-hole is 3, and oblique through-hole is along the circumference evenly distributed of dabber.
5. The totally enclosed hydraulic cutter started by throwing the ball as claimed in claim 1, wherein: the top connection with realize sealedly through the top connection is sealed between the body, the body with realize sealedly through the lower clutch between the lower clutch, the dabber with realize sealedly through the dabber is sealed between the body.
6. The totally enclosed hydraulic cutter started by pitching the ball according to claim 1, characterized in that: the stop ring and the mandrel are sealed through piston inner seal, the stop ring and the body are sealed through piston outer seal, and the stop ring and the lower joint are sealed through the stop ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220362915.7U CN217501612U (en) | 2022-02-22 | 2022-02-22 | Full-sealed hydraulic cutting knife started by throwing ball |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220362915.7U CN217501612U (en) | 2022-02-22 | 2022-02-22 | Full-sealed hydraulic cutting knife started by throwing ball |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217501612U true CN217501612U (en) | 2022-09-27 |
Family
ID=83346045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220362915.7U Active CN217501612U (en) | 2022-02-22 | 2022-02-22 | Full-sealed hydraulic cutting knife started by throwing ball |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217501612U (en) |
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2022
- 2022-02-22 CN CN202220362915.7U patent/CN217501612U/en active Active
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