CN210289708U - Constant pressure seat sealing valve - Google Patents
Constant pressure seat sealing valve Download PDFInfo
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- CN210289708U CN210289708U CN201920755532.4U CN201920755532U CN210289708U CN 210289708 U CN210289708 U CN 210289708U CN 201920755532 U CN201920755532 U CN 201920755532U CN 210289708 U CN210289708 U CN 210289708U
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Abstract
The utility model provides a constant pressure setting valve, belonging to the technical field of oil gas production, which comprises a shell, wherein one end of the shell is connected with a fracturing pipe column, and the other end is sealed; the shell is provided with a liquid inlet hole, the spring seat is positioned below the liquid inlet hole, the backwashing seat and the movable ball seat are positioned above the liquid inlet hole, a spring is arranged between the spring seat and the movable ball seat, the movable ball seat can slide relative to the shell, the backwashing seat is provided with a first channel and a second channel, the second channel comprises a large-diameter section and a small-diameter section, a first sealing ball is arranged at the transition position of the large-diameter section and the small-diameter section, and a limiting rod is arranged at the large-diameter section; the movable ball seat is provided with a third channel and a fourth channel, the flow area of the fourth channel is far smaller than that of the first channel, and the third channel is provided with a second sealing ball capable of sealing the first channel. The utility model provides a level pressure setting valve, it can test the packer in the fracturing string in advance and seal, ensures to go on smoothly to the construction of oil reservoir fracturing.
Description
Technical Field
The utility model relates to an oil gas production technical field especially relates to a level pressure seat seals valve.
Background
The fracturing process is a main measure for realizing the yield increase of an oil-gas well, and the fracturing fluid is injected into an oil layer through a fracturing pipe column by utilizing a ground high-pressure pump set, and a crack is formed in the oil layer, so that the flow conductivity of the oil layer can be improved, and the purpose of yield increase is achieved.
At present, a K344 packer is usually adopted as a core setting tool for a fracturing string, after the fracturing string is lowered into a preset position in a shaft, fracturing fluid is injected through an oil pipe by a fracturing truck group, the fluid is throttled when passing through a liquid outlet of a sand blaster or a side hole sand blaster arranged at the end part of the fracturing string, and an oil and sleeve throttling pressure difference is formed to force a rubber sleeve of the K344 packer to expand and set, so that fracturing construction can be further completed.
However, adopt above-mentioned fracturing string to carry out the fracturing to the oil reservoir, can't test the packer of fracturing string before carrying out the fracturing and seal, in case discover that the packer can't set, will lead to going on smoothly to the construction of oil reservoir fracturing.
SUMMERY OF THE UTILITY MODEL
The utility model provides a level pressure seat seals valve, it can test the packer in the fracturing string in advance and seal, ensures to go on smoothly to the construction of oil reservoir fracturing.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a constant pressure seat sealing valve, which comprises a shell, a backwashing seat, a movable ball seat and a spring seat; the casing is cylindrical, one end of the casing is provided with a first connecting part connected with the fracturing string, and the other end of the casing is a sealing end; the shell is provided with at least one liquid inlet hole along the circumferential direction, the spring seat is fixed below the liquid inlet hole, the movable ball seat is arranged above the liquid inlet hole in a clearance mode, a spring is arranged between the spring seat and the movable ball seat, and the movable ball seat can slide relative to the shell under the action of the spring; the backwashing seat is fixed above the movable ball seat and provided with a first channel and at least one second channel positioned on one side of the first channel, the second channel comprises a large-diameter section and a small-diameter section, the small-diameter section is arranged close to the movable ball seat, a first sealing ball is arranged at the transition position of the large-diameter section and the small-diameter section, and a limiting rod is arranged at one end of the large-diameter section, which is far away from the transition position; the movable ball seat is provided with a third channel opposite to the first channel and at least one fourth channel positioned on one side of the third channel, the flow area of the fourth channel is far smaller than that of the first channel, one end of the third channel, which is close to the backwashing seat, is provided with a second sealing ball, and the second sealing ball can seal the first channel.
Further, the first connecting part is a first internal thread arranged at one end of the shell;
one end of the fracturing string close to the first connecting part is provided with a first external thread; the fracturing string and the constant pressure setting valve are connected through a first internal thread and a first external thread.
Furthermore, the constant pressure setting device also comprises a guide head used for sealing one end of the shell, the guide head is in a conical cap-shaped structure, and a second internal thread is arranged at one end, close to the shell, of the guide head; a second connecting part is arranged at one end, close to the guide head, of the shell, and is provided with a second external thread matched with the second internal thread; the guide head is connected to the shell through the second internal thread and the second external thread.
Furthermore, the second connecting part is provided with an annular limiting groove along the circumferential direction; the guide head is inserted with a plurality of limiting pins, and the end parts of the limiting pins are inserted into the annular limiting grooves.
Further, the spring seat is in threaded connection with the inside of the shell.
Furthermore, the spring holder reaches the activity ball seat all is provided with and is used for inlaying the blind hole of establishing the spring.
Further, the backwashing seat is provided with a plurality of second channels which are distributed along the circumferential direction of the first channel; the movable ball seat is provided with a plurality of fourth channels, and the fourth channels are distributed along the circumferential direction of the third channels.
Further, the second channel is directly opposite to the fourth channel.
Furthermore, the movable ball seat is provided with a second frustum hole matched with the second sealing ball, and the second frustum hole is communicated with the second channel.
Furthermore, one end of the first channel, which is close to the second sealing ball, is provided with a first frustum hole, and the hole wall of the first frustum hole is attached to the second sealing ball.
Compared with the prior art, the utility model provides a level pressure seat seals valve has following advantage:
the utility model provides a constant pressure setting valve, which is suitable for setting verification of a K344 packer attached to a fracturing string; when the K344 packer needs to perform pre-test sealing, liquid is injected into the fracturing string from the ground and flows to the constant pressure setting valve, the first sealing ball is arranged in the second channel, the second channel can be sealed in the forward direction, the liquid can flow through the first channel of the backwashing seat, the liquid pushes the movable ball seat with the second sealing ball to move downwards, the liquid flows through the fourth channel, and the aperture of the fourth channel is far smaller than that of the first channel, so that the liquid can generate throttling pressure difference in the fourth channel, and the movable ball seat can continuously move downwards by overcoming the pre-tightening force of the spring.
When the top surface of the movable ball seat is positioned below the uppermost end of the liquid inlet hole, liquid enters the sleeve through the liquid inlet hole, and the throttling pressure is gradually reduced; when the throttling pressure is balanced with the restoring force of the spring, the movable ball seat does not move downwards any more, and a stable pressure difference is formed; the rubber sleeve of the packer expands and is sealed in the sleeve under the action of the internal and external pressure difference, and then the setting of the packer is completed. Therefore the utility model provides a constant pressure seat seals valve its packer that can be in advance in to the fracturing string tests to seal, ensures to go on smoothly to the construction of oil reservoir fracturing, can effectively avoid when carrying out the fracturing operation to the oil reservoir, because the packer can't sit the loss that seals and cause.
In addition to the technical problems, technical features constituting technical solutions, and advantageous effects brought by the technical features of the technical solutions described above, other technical problems that the constant pressure seat seal valve can solve, other technical features included in the technical solutions, and advantageous effects brought by the technical features will be described in further detail in the detailed description of the present invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments of the present invention or the description of the prior art will be briefly described below, it should be apparent that the drawings in the following description are only a part of the embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without creative efforts.
Fig. 1 is a schematic structural diagram of a constant pressure seat seal valve provided in an embodiment of the present invention;
FIG. 2 is a schematic structural view of the housing of FIG. 1;
FIG. 3 is a schematic structural view of the backwash seat of FIG. 1;
FIG. 4 is a schematic view of the tees of FIG. 1;
FIG. 5 is a schematic structural view of the spring seat of FIG. 1;
fig. 6 is a schematic structural view of the guide head in fig. 1.
Description of reference numerals:
10-a housing;
11-liquid inlet hole;
12-a first connection;
13-a second connection;
14-an annular limiting groove;
20-backwashing seat;
21-a first channel;
22-a second channel;
23-a first sealing ball;
24-a first frustum hole;
30-a movable ball seat;
31-a third channel;
32-a fourth channel;
33-second frustum hole;
34-a first blind hole;
35-a second sealing ball;
40-a spring;
50-spring seat;
51-a second blind hole;
52-sink tank;
60-a limit pin;
70-a guide head;
71-a limiting hole;
221-a large diameter section;
222-small diameter section.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail with reference to the accompanying drawings. It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a constant pressure seat seal valve provided in this embodiment; FIG. 2 is a schematic structural view of the housing; FIG. 3 is a schematic structural view of a backwash seat; FIG. 4 is a schematic view of a configuration of a tees; fig. 5 is a schematic structural view of a spring seat.
As shown in fig. 1 to 5, the constant pressure seat sealing valve provided by the embodiment of the present invention includes a housing 10, a backwashing seat 20, a movable ball seat 30 and a spring seat 50; the casing 10 is cylindrical, one end of the casing is provided with a first connecting part 12 connected with a fracturing string, and the other end of the casing is a sealing end; the shell 10 is provided with at least one liquid inlet hole along the circumferential direction, the spring seat 50 is fixed below the liquid inlet hole, the movable ball seat 30 is arranged above the liquid inlet hole in a clearance mode, the spring 40 is arranged between the spring seat 50 and the movable ball seat 30, and the movable ball seat 30 can slide relative to the shell 10 under the action of the spring 40; the backwashing seat 20 is fixed above the movable ball seat 30, the backwashing seat 20 is provided with a first channel 21 and at least one second channel 22 positioned on one side of the first channel 21, the second channel 22 comprises a large-diameter section 221 and a small-diameter section 222, the small-diameter section 222 is arranged close to the movable ball seat 30, a first sealing ball 23 is arranged at the transition position of the large-diameter section 221 and the small-diameter section 222, and a limiting rod is arranged at one end of the large-diameter section 221, which is far away from the transition position; the movable ball seat 30 is provided with a third channel 31 opposite to the first channel 21 and at least one fourth channel 32 positioned on one side of the third channel 31, the flow area of the fourth channel 32 is far smaller than that of the first channel 21, one end of the third channel 31 close to the backwashing seat 20 is provided with a second sealing ball 35, and the second sealing ball 35 can seal the first channel 21.
Specifically, the casing 10 can be made into a cylindrical structure by using a steel plate, a cavity for installing the backwashing seat 20, the movable ball seat 30 and the spring seat 50 is formed in the casing 10, the upper end of the casing 10 is provided with a first connecting part 12, the first connecting part 12 is used for connecting with a fracturing string, namely, the constant pressure setting valve is connected to the lower end of the fracturing string through the first connecting part 12 and communicated with the fracturing string; in this embodiment, a threaded section is provided at the upper end of the housing 10, and the threaded section is provided with a first internal thread as the first connection portion 12; be provided with on the fracturing string with first internal thread complex first external screw thread, fracturing string accessible first internal thread and second internal thread connection to level pressure seat seal valve. In addition, the first connection portion 12 may be a male screw provided at the upper end of the housing 10, and in the present embodiment, a first female screw is preferably provided at the upper end of the housing 10 as the first connection portion 12 of the housing 10.
The other end (the end opposite to the first connecting portion 12) of the housing 10 is sealed, and a sealing plate may be fixed to the end of the housing 10 or a sealing head may be detachably connected to the end for sealing, and may be set according to actual requirements. The casing 10 is provided with a plurality of liquid inlet holes 11 along the circumferential direction thereof, and the liquid inlet holes 11 communicate the hollow cavity of the casing with the hollow cavity of the casing 10. The shell 10 can be preferably provided with two liquid inlet holes 11, the two liquid inlet holes 11 are symmetrically arranged on the shell 10, and the liquid inlet holes 11 are long-strip-shaped and are arranged along the axial direction of the shell 10; along the upper end to the lower extreme of casing 10, casing 10 inner cavity has set gradually backwash seat 20, activity ball seat 30 and spring holder 50, and activity ball seat 30 is located the top in feed liquor hole 11, and has one section distance apart from the last edge in feed liquor hole 11, and spring holder 50 sets up in the below in feed liquor hole 11, and has one section distance apart from the lower edge in feed liquor hole 11.
The backwashing seat 20 is integrally cylindrical and is fixed in the shell 10, for example, the outer wall of the backwashing seat 20 is provided with an external thread, and the shell 10 is provided with an internal thread corresponding to the external thread, that is, the backwashing seat 20 is connected to the shell 10 through a thread, so that the installation position of the backwashing seat 20 can be adjusted; in addition, the outer diameter of the backwashing seat 20 is in interference fit with the inner diameter of the pipe wall of the shell 10, so that the backwashing seat 20 is inserted and fixed in the shell 10. The backwash seat 20 is provided with a first channel 21 and at least one second channel 22, the first channel 21 is located at the central part of the backwash seat 20, one second channel 22 can be arranged at any side of the first channel 21, or a plurality of second channels 22 are arranged along the circumferential direction of the second channel 22, the embodiment can be preferably provided with two second channels 22, and the two second channels 22 are symmetrically arranged on the backwash seat 20.
The flow area of the second channel 22 is smaller than that of the first channel 21, the second channel 22 comprises a large-diameter section 221 and a small-diameter section 222, the small-diameter section 222 is arranged close to the movable ball seat 30, the large-diameter section 221 is arranged far away from the movable ball seat 30, a first sealing ball 23 is arranged on the large-diameter section 221, and the first sealing ball 23 can roll on the large-diameter section 221 and can be sealed at the transition position of the large-diameter section 221 and the small-diameter section 222; to prevent the first sealing ball 23 from falling off from the large diameter section 221, a stopper rod may be provided at an end of the large diameter section 221 away from the transition, the stopper rod being fixed in the large diameter section 221 and not affecting the flow of the liquid in the second passage 22.
When liquid is injected from the fracturing string, the liquid firstly enters the large-diameter section 221 of the second channel 22 and forces the first sealing ball 23 to block the transition part of the large-diameter section 221 and the small-diameter section 222, so that the liquid cannot pass through the second channel 22, and the forward interception is realized; on the contrary, when the liquid flows from the small-diameter section 222 to the large-diameter section 221 of the second channel 22, the liquid may impact the second sealing ball 35, so that the small-diameter section 222 cannot be effectively blocked, and the liquid may pass through the second channel 22, thereby realizing "reverse conduction".
The movable ball seat 30 is integrally cylindrical, is hermetically connected in the housing 10 and is slidable relative to the housing 10, the movable ball seat 30 is provided with a third channel 31 and at least one fourth channel 32, the third channel 31 is located in the central portion of the movable ball seat 30, one fourth channel 32 can be arranged along either side of the third channel 31 or a plurality of fourth channels 32 are arranged along the circumferential direction of the third channel 31, and in this embodiment, preferably, two fourth channels 32 are symmetrically arranged on the movable ball seat 30; one end of the third channel 31 close to the backwashing seat 20 is provided with a second sealing ball 35, the second sealing ball 35 can seal the third channel 31, and when the second sealing ball 35 is abutted against the first channel 21, the second sealing ball 35 can also form effective sealing on the first channel 21.
Since the third channel 31 is provided with the second sealing ball 35, the liquid can only flow through the fourth channel 32, and the flow area of the fourth channel 32 can be far smaller than that of the first channel 21 in order to generate a pressure difference when the liquid flows through the fourth channel 32; to facilitate the flow-through of the second channel 22 and the fourth channel 32, the third channel 31 and the fourth channel 32 may be disposed opposite to each other.
The spring seat 50 is also in a cylindrical structure, is fixedly arranged in the shell 10 and is positioned below the liquid inlet hole; a spring 40 is arranged between the spring seat 50 and the movable ball seat 30, one end of the spring 40 is abutted against the spring seat 50, and the other end of the spring 40 is abutted against the bottom surface of the movable ball seat 30 far away from the second sealing ball 35; it can be understood that the spring 40 may adopt a common coil spring 40, in order to prevent the spring 40 from shaking on the spring seat 50 and the movable ball seat 30, a second blind hole 51 may be provided on the bottom surface of the spring seat 50 close to the spring 40, and a first blind hole 34 opposite to the second blind hole 51 may be provided on the bottom surface of the movable ball seat 30 close to the spring 40, and the bottom end of the first blind hole 34 is respectively communicated with the third channel 31 and the fourth channel 32; the diameters of the first blind hole 34 and the second blind hole 51 are in clearance fit with the outer diameter of the spiral spring 40, and two ends of the spring 40 are respectively inserted into the first blind hole 34 and the second blind hole 51, so that the spring 40 can be prevented from shaking; compared with the spring 40 fixed on the spring seat 50 and the movable ball seat 30 by welding, the two ends of the spring 40 in this embodiment are embedded in the first and second blind holes 34 and 51, so that the damaged spring 40 can be replaced conveniently.
In addition, the spring 40 needs to be installed between the movable ball seat 30 and the spring seat 50 in a pre-tightening manner, the pre-tightening force of the spring is slightly larger than the expansion pressure of a rubber sleeve of the packer, and in the setting process of the packer, when the pressure for pressing by injecting liquid into an oil pipe is larger than the pre-tightening force of the spring 40, the second sealing ball 35 can be pushed away, and at the moment, the rubber sleeve of the packer starts to expand and set.
When the packer of the fracturing string needs to be tested, the constant pressure setting valve is connected to the lower end of the fracturing string, and at the moment, under the action of the spring 40, the second sealing ball 35 on the movable ball seat 30 seals the first channel 21; when liquid is injected into the fracturing string, the liquid can flow into the shell 10 from the upper end of the shell 10, when the liquid flows through the backwashing seat 20, as the second channel 22 has a positive flow-stopping function, the fluid cannot flow through the second channel 22 and can only continuously flow downwards along the first channel 21, the liquid flowing into the first channel 21 impacts the second sealing ball 35, and when the pressure acting on the second sealing ball 35 is greater than the elastic force of the spring 40, the movable ball seat 30 can be pushed to move downwards along the shell 10, so that the liquid flows into a cavity between the movable ball seat 30 and the backwashing seat 20.
When the liquid flows through the movable ball seat 30, the third channel 31 is in a sealed state, the liquid continuously flows downwards from the fourth channel 32 on one side, and the throttling pressure difference is generated when the liquid flows in the fourth channel 32 due to the small flow area of the fourth channel 32, so that the movable ball seat 30 is forced to continuously downwards overcome the elastic force of the spring 40; when the top surface of the movable ball seat 30 is positioned below the uppermost end of the liquid inlet hole 11, liquid enters the sleeve through the liquid inlet hole 11, and the throttling pressure difference is gradually reduced along with the gradual increase of the liquid passing surface area; when the pressure generated by the throttling pressure difference is balanced with the elastic force of the spring 40, the movable ball seat 30 does not move downwards any more, and a stable pressure difference is formed; the packer can finish setting under the action of the internal and external pressure difference, and then the packer of the fracturing string is tested after the setting.
In addition, when the fracturing string is drilled and the well is washed, liquid in the sleeve is pressurized, the liquid in the sleeve enters the shell 10 from the liquid inlet hole 11, the second sealing ball 35 seals the first channel 21 and the third channel 31 at the moment, liquid flow enters a cavity between the movable ball seat 30 and the backwashing seat 20 from the fourth channel 32, the liquid continues to flow along the second channel 22, the second channel 22 has a reverse conduction function, and the liquid can enter the fracturing string through the second channel 22, so that the pressure balance of the oil jacket or the well washing is realized.
The utility model provides a level pressure setting valve is connected at the lower extreme of fracturing string, and it can test the packer in the fracturing string in advance and seal, ensures to go on smoothly to the construction of oil reservoir fracturing, can effectively avoid when carrying out the fracturing operation to the oil reservoir, because the packer can't sit and seal and the loss that causes.
As shown in fig. 6, fig. 6 is a schematic structural diagram of the guide head in the present embodiment, the bottom end of the housing 10 is provided with a guide head 70, and the guide head 70 is used for sealing the bottom end of the housing 10. The guide head 70 is in a conical cap-shaped structure, which is beneficial to reducing the resistance of the fracturing string in the well descending process. The opening of guide head 70 is provided with the second internal thread, and the bottom of casing 10 is provided with second connecting portion 13, and second connecting portion 13 can set to the second screw thread section, and the second screw thread section is provided with the second external thread with second internal thread matched with, and it can be known that guide head 70 passes through second external thread and second internal thread connection on casing 10. It will be appreciated that the guide head 70 may be attached to the housing 10 by other means, such as screws, etc., and that the present embodiment preferably threadedly attaches the guide head 70 to the housing 10.
Further, in order to prevent the guide head 70 from falling off the housing 10, the second connecting portion 13 is provided with an annular limiting groove 14, the guide head 70 is provided with a limiting hole 71 for inserting the limiting pin 60, when the guide head 70 is connected to the housing 10, the limiting pin 60 can be inserted into the limiting hole 71, and the end of the limiting pin 60 is inserted into the annular limiting groove 14. It is understood that two or more limit pins 60 are disposed on the guide head 70, two limit pins 60 may be symmetrically disposed on the guide head 70, or a plurality of limit pins 60 are distributed along the circumference of the guide head 70, so that the guide head 70 is stably mounted on the second connecting portion 13 of the housing 10.
On the basis of the above embodiment, the guide head 70 is detachably mounted at the bottom end of the housing 10 through a screw thread, so as to adjust the free length of the spring 40 and adjust the pre-tightening force of the spring 40; the spring seat 50 may be screwed into the housing 10. Illustratively, the circumferential side surface of the spring seat 50 is provided with an external thread, and the inner wall of the housing 10 corresponding to the spring seat 50 is provided with an internal thread; further, in order to facilitate screwing of the spring seat 50, a sunken groove 52 is formed in the bottom surface, away from the spring 40, of the spring seat 50, the sunken groove 52 is matched with a special wrench, and the sunken groove 52 can be a hexagonal sunken groove 52 or a long groove; after the constant pressure setting valve is used for a period of time, the spring 40 is greatly reduced due to fatigue, the guide head 70 can be detached from the housing 10, and the installation position of the spring seat 50 is adjusted by using a special wrench, so that the elasticity of the spring 40 meets the requirement of constant pressure setting.
In this embodiment, in order to enhance the sealing performance of the second sealing ball 35 seat on the first channel 21 and stably mount the second sealing ball 35 on the movable ball seat 30, a second tapered hole 33 may be disposed at an end of the third channel 31 facing the backwash seat 20, the second tapered hole 33 is communicated with the third channel 31, the second tapered hole 33 is used for embedding the second sealing ball 35, and the second sealing ball 35 is always located in the second tapered hole 33 during the moving process of the movable ball seat 30. One end of the first channel 21 facing the movable ball seat 30 is provided with a first frustum hole 24 to form a sealing surface attached to the second sealing ball 35, so as to enhance the sealing performance of the second sealing ball 35 to the first channel 21, and further improve the reliability and stability of the constant pressure seat seal valve.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. A constant pressure seat seal valve is characterized by comprising a shell, a backwashing seat, a movable ball seat and a spring seat;
the casing is cylindrical, one end of the casing is provided with a first connecting part connected with the fracturing string, and the other end of the casing is a sealing end;
the shell is provided with at least one liquid inlet hole along the circumferential direction, the spring seat is fixed below the liquid inlet hole, the movable ball seat is arranged above the liquid inlet hole in a clearance mode, a spring is arranged between the spring seat and the movable ball seat, and the movable ball seat can slide relative to the shell under the action of the spring;
the backwashing seat is fixed above the movable ball seat and provided with a first channel and at least one second channel positioned on one side of the first channel, the second channel comprises a large-diameter section and a small-diameter section, the small-diameter section is arranged close to the movable ball seat, a first sealing ball is arranged at the transition position of the large-diameter section and the small-diameter section, and a limiting rod is arranged at one end of the large-diameter section, which is far away from the transition position;
the movable ball seat is provided with a third channel opposite to the first channel and at least one fourth channel positioned on one side of the third channel, the flow area of the fourth channel is far smaller than that of the first channel, one end of the third channel, which is close to the backwashing seat, is provided with a second sealing ball, and the second sealing ball can seal the first channel.
2. A constant pressure seat valve according to claim 1, wherein the first connecting portion is a first internal thread provided at one end of the housing;
one end of the fracturing string close to the first connecting part is provided with a first external thread;
the fracturing string and the constant pressure setting valve are connected through a first internal thread and a first external thread.
3. A constant pressure setting valve according to claim 1, wherein the constant pressure setting device further comprises a guide head for sealing one end of the housing;
the guide head is in a conical cap-shaped structure, and a second internal thread is arranged at one end, close to the shell, of the guide head;
a second connecting part is arranged at one end, close to the guide head, of the shell, and is provided with a second external thread matched with the second internal thread;
the guide head is connected to the shell through the second internal thread and the second external thread.
4. A constant pressure seat valve according to claim 3, wherein the second connecting portion is provided with an annular restriction groove along a circumferential direction thereof;
the guide head is inserted with a plurality of limiting pins, and the end parts of the limiting pins are inserted into the annular limiting grooves.
5. A constant pressure seat valve according to claim 3, wherein the spring seat is threaded within the housing.
6. A constant pressure setting valve according to claim 5, wherein the spring seat and the movable ball seat are provided with blind holes for embedding the spring.
7. The constant-pressure setting valve as claimed in claim 1, wherein the backwashing seat is provided with a plurality of the second passages which are distributed along the circumferential direction of the first passage;
the movable ball seat is provided with a plurality of fourth channels, and the fourth channels are distributed along the circumferential direction of the third channels.
8. A constant pressure seat valve according to claim 7, wherein the second passage is diametrically opposed to the fourth passage.
9. A constant pressure seat valve according to claim 1, wherein the movable ball seat is provided with a second tapered bore cooperating with the second sealing ball, and the second tapered bore communicates with the second passage.
10. A constant pressure seat valve according to claim 9, wherein one end of the first passage disposed adjacent to the second sealing ball is provided with a first frustum hole, and the hole wall of the first frustum hole is attached to the second sealing ball.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920755532.4U CN210289708U (en) | 2019-05-24 | 2019-05-24 | Constant pressure seat sealing valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920755532.4U CN210289708U (en) | 2019-05-24 | 2019-05-24 | Constant pressure seat sealing valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210289708U true CN210289708U (en) | 2020-04-10 |
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ID=70070619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920755532.4U Active CN210289708U (en) | 2019-05-24 | 2019-05-24 | Constant pressure seat sealing valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210289708U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113323629A (en) * | 2021-08-03 | 2021-08-31 | 东营市瑞丰石油技术发展有限责任公司 | Lockable ball type shearing ball seat |
-
2019
- 2019-05-24 CN CN201920755532.4U patent/CN210289708U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113323629A (en) * | 2021-08-03 | 2021-08-31 | 东营市瑞丰石油技术发展有限责任公司 | Lockable ball type shearing ball seat |
| CN113323629B (en) * | 2021-08-03 | 2021-11-02 | 东营市瑞丰石油技术发展有限责任公司 | Lockable ball type shearing ball seat |
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