CN210033402U - Toe end valve - Google Patents
Toe end valve Download PDFInfo
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- CN210033402U CN210033402U CN201920592734.1U CN201920592734U CN210033402U CN 210033402 U CN210033402 U CN 210033402U CN 201920592734 U CN201920592734 U CN 201920592734U CN 210033402 U CN210033402 U CN 210033402U
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- fracturing fluid
- fracturing
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- annular piston
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Abstract
The utility model discloses a toe end valve, which is arranged on a well cementation casing pipe and comprises a core pipe, wherein the upper end and the lower end of the core pipe are communicated with the well cementation casing pipe; a cavity is arranged between the core tube and the valve sleeve, an annular piston is arranged in the cavity, and the annular piston is fixed on the outer side wall of the core tube through a shear pin and seals flow guide holes arranged in the circumferential direction of the core tube and the valve sleeve; the upper part of the annular piston is provided with a hollow pin communicated with the inner cavity of the core pipe, the cavity is internally provided with a fracturing fluid release device, and the fracturing fluid release device impacts the hollow pin to ensure that the fracturing fluid flows out of the core pipe through the broken hollow pin to force the annular piston to slide so as to release the fracturing fluid from the flow guide hole to perform fracturing operation on an oil layer. The utility model discloses an install the toe end valve on the sleeve pipe, with fracturing string and required fracturing oil reservoir promptly the fracturing position intercommunication that the toe end corresponds constitute the passageway of fracturing fluid, saved the construction volume, the cost is reduced has effectively improved production efficiency.
Description
Technical Field
The utility model belongs to the technical field of oil field oil well fracturing, a supporting instrument in fracturing well completion tubular column is related to, concretely relates to toe end valve.
Background
The fracturing process is a main means for improving the productivity of an oil well, generally fracturing construction is carried out before the oil well is put into operation, and the flow conductivity of a stratum is improved through fracturing, so that the yield of the oil well is improved.
Different well completion modes are selected according to the geological characteristics of an oil well, and currently, open hole pipe external sealing separate layer fracturing, well cementation sliding sleeve separate layer fracturing, fast drilling plug separate layer fracturing, sleeve mixed fracturing well completion and the like exist.
In the well cementation sliding sleeve or open hole pipe outer sealing separate layer fracturing, because a high-pressure dead zone is formed at the lower part of the sleeve after well cementation, the lower layer position cannot be directly fractured, the most common mode is that a perforating pipe column is independently walked once, the lower layer position is fractured after perforation, and after fracturing is finished, a ball is thrown to open the upper layer sliding sleeve to be fractured so as to fracture the upper layer position, so that construction is complex, and investment cost is high.
Disclosure of Invention
Problem to prior art existence, the utility model aims to provide a toe end valve, this toe end valve can release the fracturing fluid in the cover pipe to the fracturing oil reservoir, has reduced the construction degree of difficulty, has saved construction volume and cost, has effectively improved work efficiency.
In order to achieve the above purpose, the utility model discloses technical scheme as follows:
a toe end valve is installed on a well cementation casing and comprises a core pipe, wherein the upper end and the lower end of the core pipe are communicated with the casing, and a valve sleeve is sleeved on the outer side of the core pipe; a cavity is arranged between the core tube and the valve sleeve, an annular piston is arranged in the cavity, and the annular piston is fixed on the outer side wall of the core tube through a shear pin and seals flow guide holes arranged in the circumferential direction of the core tube and the valve sleeve; the upper part of the annular piston is provided with a hollow pin communicated with the inner cavity of the core pipe, the cavity is internally provided with a fracturing fluid release device, and the fracturing fluid release device impacts the hollow pin to ensure that the fracturing fluid flows out of the core pipe through the broken hollow pin to force the annular piston to slide so as to release the fracturing fluid from the flow guide hole to perform fracturing operation on an oil layer.
Furthermore, the shear pin penetrates through a mounting hole formed in the annular piston, and the tail end of the shear pin is inserted into the outer side wall of the core pipe.
Further, the shear pins are uniformly distributed along the circumferential direction of the core pipe.
Furthermore, fracturing fluid release unit is including the power supply control unit who connects gradually, the motor, motor reducer and telescopic link, the terminal of telescopic link with hollow round pin is inconsistent.
Further, the fracturing fluid release device is fixedly arranged on a fixing ring in the cavity.
Further, the root of hollow round pin is provided with the cracked necking down structure of doing benefit to hollow round pin.
Further, the motor and the motor reducer are of an integral structure.
Furthermore, the power supply control unit comprises a power supply, a single chip microcomputer control circuit and a timer, and the single chip microcomputer control circuit is matched with the timer to complete the impact action of the fracturing fluid release device on the hollow pin.
Further, the power supply is a storage battery.
The utility model discloses in overcoming well cementation sliding sleeve or bore hole outside of tubes and sealing the layering fracturing work progress, the construction is more complicated when fracturing to the sleeve pipe lower part, the problem that the input cost is high, through installing the toe end valve on the sleeve pipe, with fracturing string and required fracturing oil reservoir promptly the fracturing position intercommunication that the toe end corresponds constitutes the passageway of fracturing fluid, has saved the construction volume, and the cost is reduced has effectively improved production efficiency.
Through adopting power supply control unit control fracturing fluid release device to strike the inside hollow pin of toe end valve, make the inside fracturing fluid of toe end valve release to act on in the fracturing oil reservoir, effectively reduced the construction degree of difficulty, the operation is controllable.
The toe end valve is put into a well along with a sleeve after the opening time is adjusted on the ground by adopting the mutual matching of the single chip microcomputer control circuit and the timer, when the preset opening time is reached, the single chip microcomputer control circuit controls the motor speed reducer to eject the telescopic rod out, so that the hollow pin is broken, further, high-pressure fracturing fluid is released from the toe end valve through the hollow pin, further, under the high-pressure action of the fracturing fluid, the shear pin of the fixed ring type piston is sheared, the ring type piston moves downwards, and the fracturing fluid is guided to a fracturing oil layer from the guide hole to be subjected to normal fracturing construction, the whole process is simple to operate, and the fracturing fluid is safe and reliable, and a large amount of manpower and material cost is reduced.
Drawings
FIG. 1 is a schematic view of a middle toe end valve according to the present invention;
fig. 2 is an installation schematic diagram of the hollow pin of the present invention.
In the figure, 1 core tube, 1-1 core tube diversion hole, 2 valve sleeve, 2-1 valve sleeve diversion hole, 3 fixed ring, 4 power supply control unit, 5-1 motor, 5-2 motor reducer, 6 telescopic rod, 7 hollow pin, 7-1 necking structure, 8 shear pin, 9 ring type piston, A upper cavity and B lower cavity.
Detailed Description
To clearly illustrate the design concept of the present invention, the following description is made with reference to the examples.
In the description of the present embodiment, the terms "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as specifically indicating or implying relative importance.
Example 1
Referring to fig. 1, the toe end valve of the present embodiment is mounted on a well cementing casing, and includes a core tube 1, the upper and lower ends of which are communicated with the casing (not shown in the figure), and a valve sleeve 2 sleeved on the core tube 1; a cavity is arranged between the core pipe 1 and the valve sleeve 2, an annular piston 9 is arranged in the cavity, the annular piston 9 is fixed on the outer side wall of the core pipe 1 through a shear pin 8, and seals a core pipe diversion hole 1-1 on the core pipe and a valve sleeve diversion hole 2-1 on the valve sleeve; the upper part of the annular piston 9 is provided with a hollow pin 7 communicated with the inner cavity of the core pipe 1, and the fractured hollow pin 7 can flow out the fracturing fluid from the inside of the core pipe 1 to force the annular piston 9 to slide downwards so as to release the fracturing fluid from the casing pipe to perform fracturing operation on an oil layer.
The utility model provides a toe end valve installs on the well cementation sleeve pipe, goes deep into the underground oil reservoir in the lump along with the well cementation sleeve pipe when the well cementation operation, after reaching predetermined fracturing oil reservoir, at first carries out the well cementation operation, then through the length of time that the timer is predetermined, releases the fracturing fluid in the toe end valve from the core pipe, and then carries out normal fracturing construction.
The toe valve opening time is adjusted on the surface prior to penetrating into the ground, the predetermined length of time being correlated to the cementing time, typically longer than normal cementing operation time. When the well cementation casing reaches a fracturing oil layer, namely the toe end valve is in place, and the preset time is reached, the fracturing fluid release device firstly drives the telescopic rod to impact and push the hollow pin to destroy the hollow pin, so that the fracturing fluid in the toe end valve core pipe is firstly released through the broken hollow pin, then the shear pin of the fixed annular piston is sheared under the action of the high-pressure fracturing fluid, the movement of the annular piston is not limited by the shear pin any more, and the annular piston moves downwards along the axial direction of the core pipe under the action of the fracturing fluid to release the sealing state of the guide hole of the toe end valve, so that the fracturing fluid can directly act on the fracturing oil layer area.
In traditional fracturing construction operation, the lower part of well completion back sleeve pipe generally can form the high pressure blind spot, can't directly carry out fracturing operation to this high pressure blind spot, still need set up a set of perforation tubular column in addition alone, carries out the fracturing to the lower part position after the perforation, after fracturing, throws the ball again and opens upper portion and want fracturing layer sliding sleeve to carry out fracturing to the upper portion position, and holistic work progress is complicated, and equipment input cost is high. The utility model discloses well toe end valve installs on the well cementation sleeve pipe, opens toe end valve when presetting, can make the fracturing fluid in the sleeve pipe wear out toe end valve direct action in high-pressure blind spot, easy operation, safe and reliable.
Example 2
See fig. 1 in conjunction with fig. 2. The toe end valve of the embodiment comprises a core pipe 1 and a valve sleeve 2 which are concentrically arranged, wherein the top end and the low end of the core pipe 1 are communicated with a well cementation casing pipe, a core pipe diversion hole 1-1 and a valve sleeve diversion hole 2-1 are respectively arranged at the circumferential opposite positions of the core pipe 1 and the valve sleeve 2, an annular cavity is reserved between the core pipe 1 and the valve sleeve 2, an annular piston 9 for sealing the diversion holes is arranged in the annular cavity, the annular piston 9 is fixed on the core pipe 1 through a shear pin 8 of which the tail end is inserted on the outer side wall of the core pipe 1, and the annular cavity is divided into an upper cavity A and a lower cavity B. The upper part of the annular piston 9 is provided with a hollow pin 7 communicated with the inner cavity of the core pipe 1, the hollow pin 7 can be broken under the action of external force, so that fracturing fluid in the core pipe 1 flows out from the inside, the shear pin 8 can be sheared under the high pressure action of the fracturing fluid, the annular piston 9 is separated from the constraint of the shear pin 8, the toe end valve is communicated with the outside through the diversion hole, and the fracturing fluid is released from the casing pipe to perform fracturing operation on an oil layer. The shear pins 8 are uniformly distributed on the outer side wall of the core tube 1 in the circumferential direction, penetrate through the mounting holes in the annular piston 9, and the tail ends of the shear pins 8 are inserted on the outer side wall of the core tube 1. The arrangement mode is that on the premise of meeting the sealing strength of the annular piston 9, the connection strength of the annular piston 9 and the core tube 1 is reduced as much as possible, so that the limitation on the position of the annular piston 9 is relieved. In this embodiment, the number of the shear pins 8 is 3, and may be 4 or 5 according to the actual arrangement.
Install the fracturing fluid release of toe end valve in the cyclic annular cavity, strike hollow round pin 7 and break off hollow round pin 7, make fracturing fluid flow out from core pipe 1 inside through hollow round pin 7 after the fracture. The fracturing fluid release device comprises a power supply control unit 4, a motor 5-1, a motor speed reducer 5-2 and a telescopic rod 6 which are sequentially connected, and the tail end of the telescopic rod 6 is abutted to the hollow pin 7. In the specific operation process, firstly, the triggering action of the motor reducer 5-2 is preset and timed on the ground, when the well cementation work is finished and reaches a preset time, a power supply in the power supply control unit 4 supplies power to the motor 5-1, the motor 5-1 drives the motor speed reducer 5-2 to output power, the telescopic rod 6 which is in contact with the hollow pin 7 is controlled to push downwards, the hollow pin 7 is broken, fracturing fluid in the core pipe 1 firstly overflows through the broken hollow pin 7 and enters the upper cavity A, under the action of fracturing hydraulic pressure, the shear pin 8 is sheared, the annular piston 9 is separated from the constraint of the shear pin 8 and slides along the axial direction of the core pipe 1 to the lower cavity B, so that the guide holes in the core pipe 1 and the valve sleeve 2 are not sealed by the annular piston 9 any more, and fracturing fluid is continuously released from the toe end valve to a fracturing oil layer to start normal fracturing operation.
In order to reduce the space in this embodiment, the motor 5-1 and the motor reducer 5-2 adopt an integral structure, and meanwhile, in order to ensure the thrust strength of the telescopic rod 6 applied to the hollow pin 7 and avoid the situation that the fracturing fluid release device is reversely pushed by the hollow pin 7, the fracturing fluid release device is fixedly installed on the fixing ring 3 in the annular cavity, and the telescopic rod 6 can more effectively apply destructive force to the hollow pin 7. Meanwhile, a necking structure 7-1 which is beneficial to fracture of the hollow pin 7 is arranged at the root part of the hollow pin 7 connected with the core pipe 1, specifically, the necking structure 7-1 is a groove formed on the outer side wall of the hollow pin 7 in a surrounding mode, the weak point of the hollow pin 7 at the necking position is easy to fracture under the action of external force, fracturing fluid is convenient to release from the core pipe 1, the operation is reliable, and the installation structure of the hollow pin 7 specifically refers to fig. 2.
In the implementation, the output power of the motor 5-1 is controlled by the power supply control unit 4, the power supply control unit 4 comprises a power supply, a single chip microcomputer control circuit and a timer, and the single chip microcomputer control circuit and the timer are matched to complete the impact action of the fracturing fluid release device on the hollow pin 7. The timer mainly is the timing function who realizes above-mentioned, and can realize giving the control of electricity to the power through single chip microcomputer control circuit, reachs and predetermine long back, single chip microcomputer control circuit with the power and the 5-1 switch-on of battery form to trigger the promotion striking of telescopic link 6 to hollow round pin 7, in order to reach the technical purpose of above-mentioned release fracturing fluid, the utility model provides a single chip microcomputer chip can adopt XC886 singlechip that has timing function in the english flying slush singlechip, comes the timing control power to supply power for the motor, thereby reaches the technological effect of opening hollow round pin after predetermineeing the time.
It is important to point out, the utility model discloses a through adopting power supply control unit control fracturing fluid release to strike the inside hollow round pin of toe end valve, make the inside fracturing fluid of toe end valve release to act on in the fracturing oil reservoir, effectively reduced the construction degree of difficulty, the operation is controllable.
It needs to be explained that 1, except for adopting the matching form of the singlechip control circuit and the timer, the power output can be implemented through remote sensing; 2. besides a group of flow guide holes and annular pistons, two or three layers of flow guide holes can be arranged, and flow rate of fracturing fluid can be increased by grading the flow guide holes on different layers and the opposite annular pistons through the series effect of the fracturing fluid. These are all made by those skilled in the art based on their basic skills based on understanding the idea of the present invention, and are not illustrated herein.
Finally, it is to be understood that the above embodiments are merely exemplary embodiments that have been employed to illustrate the principles of the present invention, and that the present invention is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention, and these changes and modifications are to be considered as the protection scope of the invention.
Claims (9)
1. A toe end valve is installed on a well cementation casing and is characterized by comprising a core pipe, wherein the upper end and the lower end of the core pipe are communicated with the casing, and the outer side of the core pipe is sleeved with a valve sleeve; a cavity is arranged between the core tube and the valve sleeve, an annular piston is arranged in the cavity, and the annular piston is fixed on the outer side wall of the core tube through a shear pin and seals flow guide holes arranged in the circumferential direction of the core tube and the valve sleeve; the upper part of the annular piston is provided with a hollow pin communicated with the inner cavity of the core pipe, the cavity is internally provided with a fracturing fluid release device, and the fracturing fluid release device impacts the hollow pin to ensure that the fracturing fluid flows out of the core pipe through the broken hollow pin to force the annular piston to slide so as to release the fracturing fluid from the flow guide hole to perform fracturing operation on an oil layer.
2. The toe end valve of claim 1 wherein the shear pin passes through a mounting hole provided in the annular piston and the end of the shear pin is inserted on the outside wall of the core tube.
3. The toe end valve of claim 2 wherein the shear pins are uniformly distributed along the circumference of the core tube.
4. The toe end valve of claim 1, wherein the fracturing fluid release device comprises a power supply control unit, a motor reducer and a telescopic rod which are connected in sequence, wherein the tail end of the telescopic rod is abutted against the hollow pin.
5. The toe valve of claim 4, wherein the fracturing fluid release device is fixedly mounted on a fixed ring in the cavity.
6. The toe valve of any of claims 1 to 5, wherein the root of the hollow pin is provided with a constriction to facilitate breaking of the hollow pin.
7. The toe end valve of claim 4, wherein the motor and motor reducer are of a unitary construction.
8. The toe end valve of claim 4, wherein the power supply control unit comprises a power supply, a single chip microcomputer control circuit and a timer, and the single chip microcomputer control circuit and the timer are matched to complete the impact action of the fracturing fluid release device on the hollow pin.
9. The toe end valve of claim 8, wherein the power source is a battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920592734.1U CN210033402U (en) | 2019-04-26 | 2019-04-26 | Toe end valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920592734.1U CN210033402U (en) | 2019-04-26 | 2019-04-26 | Toe end valve |
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| Publication Number | Publication Date |
|---|---|
| CN210033402U true CN210033402U (en) | 2020-02-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920592734.1U Active CN210033402U (en) | 2019-04-26 | 2019-04-26 | Toe end valve |
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| CN (1) | CN210033402U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110130862A (en) * | 2019-04-26 | 2019-08-16 | 托普威尔石油技术股份公司 | A kind of toe-end valve |
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2019
- 2019-04-26 CN CN201920592734.1U patent/CN210033402U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110130862A (en) * | 2019-04-26 | 2019-08-16 | 托普威尔石油技术股份公司 | A kind of toe-end valve |
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