A new type of double barrier drilling float valve based on Tesla valve and float valve drilling tool

Abstract

The application relates to the technical field of oil drilling equipment, in particular to a new double-barrier drilling float valve based on a Tesla valve and a float valve drilling tool. The drilling float valve comprises a float valve short section, the inside of the float valve short section is provided with a Tesla valve special flow channel and a common flow channel which are communicated with each other; the Tesla valve special flow channel and the common flow channel are arranged at the upper part and the lower part of the drilling float valve respectively; the Tesla valve special flow channel and the common flow channel are one-way conducting fluid valves with the same direction, and only allow the drilling fluid to flow from the upper part to the lower part. The application effectively prevents the backflow of reverse fluid, can significantly reduce the fluid backflow speed even when the formation pressure is large or the common flow channel is damaged, guarantees the well control safety of drilling operation, and reduces the float valve failure risk under complex working conditions.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil drilling equipment, in particular to a new double-barrier drilling float valve based on a Tesla valve and a float valve drilling tool. BACKGROUND

[0002] With the continuous progress of China's oil and gas exploration technology, the exploration and development activities of deep and ultra-deep wells are being continuously strengthened. However, the continuous increase of well depth makes the drilling operation extremely complex, and frequent extreme geological conditions such as high temperature, high pressure and high sulfur content are encountered, which significantly increases the well control risk under narrow pressure window. In particular, the failure cases of float valve drilling tools occur frequently, and once the emergency connection of the surface blowout prevention tool fails, it may cause a major well control accident. Under this background, the safety performance of the float valve drilling tool during drilling is particularly important, especially in the failure case, providing a safe condition for the surface to connect the blowout prevention tool becomes a key problem to be solved.

[0003] The current widely used float valve drilling tool, in the long-term drilling circulation process, the reset spring is easy to fail, and the sealing ring is easy to be damaged by erosion, which directly leads to the performance decline of the float valve drilling tool and even failure. Once the failure occurs, the well fluid quickly flows into the drilling tool, and due to the limited internal space of the drilling tool, the fluid return speed is extremely high, which brings great challenges to the surface to connect the blowout prevention tool. At the same time, after the failure of the float valve drilling tool, the well pressure is directly transmitted to the surface, which greatly increases the risk of well control problems.

[0004] The float valve drilling tool occupies a core position in the well control safety system of drilling operation, but the existing float valve drilling tool has inherent defects in material and structure, and the stability is insufficient, which is difficult to cope with complex geological conditions such as high temperature, high pressure and high sulfur content. After the failure, the requirement for the condition of connecting the blowout prevention tool on the surface is extremely harsh, and it cannot meet the current increasingly complex drilling demand. Therefore, it is urgent to enhance the safety barrier of the float valve drilling tool, that is, even in the case of failure, it can create a safe condition for connecting the blowout prevention tool, and ensure that the safety bottom line of drilling operation is not threatened. SUMMARY

[0005] The purpose of the present application is to provide a new double-barrier drilling float valve based on a Tesla valve and a float valve drilling tool to solve at least one of the above technical problems.

[0006] The present application realizes the above-mentioned purpose through the following technical solutions:

[0007] A new double-barrier drilling float valve based on a Tesla valve, comprising a float valve short section, wherein a Tesla valve special flow channel and an ordinary flow channel are arranged in the float valve short section and are communicated with each other;

[0008] The Tesla valve special flow channel and the ordinary flow channel are arranged at the upper part and the lower part of the drilling float valve, respectively.

[0009] The special flow channel of the Tesla valve and the common flow channel are one-way fluid valves with the same direction, allowing only the drilling fluid to flow from the upper part to the lower part of the float valve.

[0010] Further, the common flow channel is sequentially provided with a gland, a cone plug, a reset spring and a base from top to bottom inside;

[0011] The middle of the gland and the base is provided with a flow hole for liquid to pass through; the cone plug is connected with the base through the reset spring;

[0012] The cone plug can block the flow hole in the middle of the gland in the state of being attached to the gland.

[0013] Further, the cone plug can move up and down with the flow of the drilling fluid.

[0014] Further, in the limit compression state of the reset spring, the flow hole in the middle of the base can still pass through the drilling fluid.

[0015] Further, the cone plug is a tapered structure with a narrow upper part and a wide lower part.

[0016] Further, the cone plug is made of hard alloy metal.

[0017] Further, the upper surface of the cone plug is provided with a sealing ring, and the bottom of the gland is provided with a sealing groove matched with the sealing ring; the sealing ring and the sealing groove form a sealing structure when they are attached.

[0018] Further, the float valve short section is a cylindrical structure.

[0019] A float valve drilling tool comprising the novel double-barrier drilling float valve based on the Tesla valve according to any one of the above.

[0020] Further, the float valve drilling tool can be applied to complex geological conditions with high temperature, high pressure and high sulfur content.

[0021] The beneficial effects of the present application are:

[0022] The present application provides double protection for well control safety in oil and gas field drilling operations by fusing the special flow channel of the Tesla valve with the common flow channel; not only novel and unique, but also significantly enhancing the sealing efficiency of the float valve by adding a stable special flow channel of the Tesla valve based on the mechanical structure of the cone plug and the reset spring. The present application optimizes the stability of the mechanical structure, which can significantly reduce the risk of float valve failure even under extreme working conditions such as high temperature, high pressure and high sulfur content, thereby ensuring the safety of well control in drilling operations. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1A structure diagram of a new type of double-barrier drilling float valve based on a Tesla valve according to an embodiment of the present application;

[0024] Figure 2 A working schematic of a new type of double-barrier drilling float valve based on a Tesla valve according to an embodiment of the present application Figure One ;

[0025] Figure 3 A working schematic of a new type of double-barrier drilling float valve based on a Tesla valve according to an embodiment of the present application Figure Two ;

[0026] Figure 4 A working schematic of a new type of double-barrier drilling float valve based on a Tesla valve according to an embodiment of the present application Figure Three ;

[0027] Figure 5 A working schematic of a new type of double-barrier drilling float valve based on a Tesla valve according to an embodiment of the present application Figure Four .

[0028] Wherein: 1, float valve short section; 2, Tesla valve special flow passage; 3, ordinary flow passage; 4, gland; 5, cone plug; 6, reset spring; 7, base. DETAILED DESCRIPTION

[0029] The present application will now be discussed with reference to example embodiments. It should be appreciated that the discussed embodiments are merely for the purpose of enabling those of ordinary skill in the art to better understand and therefore implement the present application, and are not intended to imply any limitation of the scope of the present application.

[0030] As used herein, the term "comprising" and its variants are to be construed as open-ended terms meaning "including, but not limited to," in connection with any device, method, or the like. The term "based on" is to be construed as "based at least in part on." The terms "one embodiment" and "an embodiment" are to be construed as "at least one embodiment."

[0031] Embodiment One

[0032] Figure 1 A structure diagram of a new type of double-barrier drilling float valve based on a Tesla valve according to an embodiment of the present application. As shown in Figure 1 shown, according to an embodiment of the present application, a new type of double-barrier drilling float valve based on a Tesla valve includes a float valve short section 1, and a Tesla valve special flow passage 2 and an ordinary flow passage 3 are arranged in the float valve short section 1 and are in communication with each other;

[0033] The Tesla valve special flow passage 2 and the ordinary flow passage 3 are arranged at the upper part and the lower part of the drilling float valve, respectively;

[0034] The special flow channel 2 and the common flow channel 3 of the Tesla valve are one-way fluid valves with the same direction, and only allow the drilling fluid to flow from the upper part to the lower part of the valve.

[0035] Preferably, the float valve nipple 1 is a cylindrical structure.

[0036] In this embodiment, a double-barrier drilling float valve based on the Tesla valve is proposed. The core component of the float valve is a cylindrical float valve nipple 1, which is internally designed with an upper and lower through fluid channel, i.e., a float valve inner flow channel, for the passage of drilling fluid. The float valve inner flow channel is formed by the upper and lower connection of the Tesla valve special flow channel 2 and the common flow channel 3 and is in communication with each other. The Tesla valve special flow channel 2 is located at the upper part and forms a one-way fluid valve structure with the common flow channel 3, which ensures that the drilling fluid can only flow smoothly from the upper part to the lower part of the float valve nipple 1, effectively preventing the reverse flow of fluid. When the drilling fluid flows in the forward direction, it flows from the Tesla valve special flow channel 2 to the common flow channel 3 and finally flows out through the bottom of the float valve nipple 1. This design allows the forward fluid to pass quickly, while the reverse fluid is blocked layer by layer. When the formation pressure is too high, the special fluid control mechanism of the Tesla valve significantly reduces the fluid backflow speed. Even when the common flow channel 3 is damaged, the fluid backflow speed can still be controlled, further reducing the well control risk.

[0037] The present application forms a one-way flow structure by the upper and lower connection of the Tesla valve special flow channel and the common flow channel in the cylindrical float valve nipple, effectively preventing the reverse flow of fluid. Even when the formation pressure is high or the common flow channel is damaged, the fluid backflow speed can be significantly reduced, ensuring the safety of drilling operations and reducing the risk of float valve failure under complex working conditions.

[0038] According to an embodiment of the present application, the inside of the common flow channel 3 is sequentially provided with a gland 4, a tapered plug 5, a return spring 6 and a base 7 from top to bottom;

[0039] The middle of the gland 4 and the base 7 is provided with a flow hole for the passage of liquid; the tapered plug 5 is connected with the base 7 through the return spring 6;

[0040] The tapered plug 5 can block the flow hole in the middle of the gland 4 in the state of being attached to the gland 4.

[0041] Preferably, the tapered plug 5 can move up and down with the flow of drilling fluid.

[0042] Preferably, in the limit compression state of the return spring 6, the flow hole in the middle of the base 7 can still pass the drilling fluid.

[0043] Preferably, the tapered plug 5 is a tapered structure with a narrow upper part and a wide lower part.

[0044] Preferably, the tapered plug 5 is made of hard alloy metal.

[0045] In this embodiment, the ordinary flow channel 3 for the drilling fluid is sequentially arranged from top to bottom with a gland 4, a cone plug 5, a reset spring 6 and a base 7. The gland 4 and the base 7 are both designed with flow holes allowing liquid to flow through, and the cone plug 5 is connected to the base 7 through a reset spring 6, and the cone plug 5 and the reset spring 6 are located between the gland 4 and the base 7. In particular, the cone plug 5 can effectively block the flow hole in the middle of the gland 4 when it is attached to the gland 4. The cone plug 5 is fixedly connected with the reset spring 6. The reset spring 6 is used to adjust the cone plug and control the active position of the cone plug. The cone plug 5 is designed to move up and down in response to the dynamic flow of the drilling fluid, and its structure is a tapered shape with a narrow top and a wide bottom, and the material is selected to be hard alloy metal to enhance durability and sealing performance. The reset spring 6 allows the cone plug 5 to adjust its position according to the flow rate of the drilling fluid, and even when the reset spring 6 reaches the limit of compression, the flow hole in the center of the base 7 can still maintain smooth passage of the drilling fluid. The up-and-down movement of the cone plug 5 and the adjustment of the reset spring 6 achieve intelligent control of the flow rate of the drilling fluid. When the drilling fluid flows, the cone plug 5 adjusts its position according to the flow rate, and when the circulation stops, the cone plug 5 returns to its original position under the action of the reset spring 6 and closes the flow channel, thereby providing an efficient and flexible drilling fluid management solution.

[0046] The ordinary flow channel of the present application achieves intelligent control of the flow rate of the drilling fluid by arranging the movable cone plug and the reset spring in the drilling fluid flow channel, thereby improving the efficiency and flexibility of drilling fluid management.

[0047] According to one embodiment of the present application, a sealing ring is arranged on the upper surface of the cone plug 5, and a sealing groove matching the sealing ring is arranged at the bottom of the gland 4; the sealing ring and the sealing groove form a sealing structure when they are tightly attached.

[0048] In this embodiment, a sealing mechanism is arranged in the ordinary flow channel 3, including a sealing ring arranged on the upper surface of the cone plug 5 and a sealing groove arranged on the inner wall of the valve body (mainly referring to the bottom of the gland 4); the sealing ring cooperates with the sealing groove to form a sealing structure. When the sealing ring and the sealing groove are tightly attached, a reliable sealing structure is formed, ensuring that the sealing performance of the valve body is not affected during the movement of the cone plug 5.

[0049] The present application improves the sealing performance of the cone plug during movement by arranging a sealing ring on the cone plug and a matching sealing groove at the bottom of the gland, thereby ensuring the safety and efficiency of drilling fluid management.

[0050] The application introduces a special flow channel of Tesla valve as a barrier to form a double-barrier system with the mechanical structure of the cone plug-reset spring in the common flow channel; not only the one-way conduction performance of the drilling float valve is strengthened, and the potential damage of the reverse flow of fluid to the cone plug and reset spring when the formation pressure is too large is effectively prevented, but also the special fluid control mechanism of the Tesla valve can significantly slow down the fluid backflow speed even if the mechanical structure is damaged under extreme working conditions, thereby greatly reducing the well control risk. The drilling float valve structure of the application is unique and ingenious in design, has excellent sealing performance, and fundamentally improves the stability of the mechanical structure, ensures that the float valve can maintain a high-efficiency and reliable working state even in complex operating environments such as high temperature, high pressure, and high sulfur content, and provides solid technical support and protection for the well control safety of oil and gas field drilling operations.

[0051] Example two

[0052] Figure 2 A working schematic of a new double-barrier drilling float valve based on Tesla valve according to an embodiment of the application Figure One ; Figure 3 A working schematic of a new double-barrier drilling float valve based on Tesla valve according to an embodiment of the application Figure Two ; Figure 4 A working schematic of a new double-barrier drilling float valve based on Tesla valve according to an embodiment of the application Figure Three ; Figure 5 A working schematic of a new double-barrier drilling float valve based on Tesla valve according to an embodiment of the application Figure Four . As shown in Figures 1-5 , according to an embodiment of the application, a new double-barrier drilling float valve based on Tesla valve includes a float valve short section 1, a Tesla valve special flow channel 2, a common flow channel 3, a gland 4, a cone plug 5, a reset spring 6, and a base 7.

[0053] The flow channel in the float valve short section 1 is composed of the Tesla valve special flow channel 2 and the common flow channel 3, the Tesla valve special flow channel 2 is connected with the common flow channel 3, and the common flow channel 3 is provided with the gland 4, the cone plug 5, the reset spring 6, and the base 7. During normal drilling, the drilling fluid in the Tesla valve special flow channel 2 will normally flow through the common flow channel 3, the drilling fluid from above the cone plug 5 pushes the cone plug 5 downward under a small opening pressure, so that the common flow channel 3 is unobstructed, and the normal circulation of the drilling fluid is ensured. When complex conditions such as well kick occur, the drilling fluid flows reversely, the cone plug 5 loses the opening pressure and is pushed upward by the reset spring 6 to adhere to the gland 4 to form a seal, thereby preventing the reverse flow of the drilling fluid and realizing the one-way valve effect.

[0054] When the cone plug 5 and the reset spring 6 are damaged due to special circumstances, the reverse flow of the drilling fluid occurs after the complex working conditions such as well flow, and the high-pressure drilling fluid flowing back in the ordinary flow channel 3 reversely flows through the special flow channel 2 of the Tesla valve, and is gradually decompressed by the special flow channel of the Tesla valve, so that the pressure of the drilling fluid flowing through the special flow channel 2 of the Tesla valve is greatly reduced, which creates favorable conditions for the emergency connection of the inner blowout prevention tool and escorts the safety of well control.

[0055] The novel double-barrier drilling float valve based on the Tesla valve provided by the application realizes the normal circulation of the drilling fluid and the function of the one-way valve, effectively prevents the reverse flow of the fluid under complex working conditions, and greatly reduces the pressure of the backflow drilling fluid by gradually decompressing the special flow channel of the Tesla valve when the mechanical structure fails, thereby providing favorable conditions for the emergency connection of the inner blowout prevention tool, and comprehensively enhancing the well control safety of the oil and gas field drilling operation.

[0056] Example three

[0057] A float valve drilling tool comprises any one of the novel double-barrier drilling float valves based on the Tesla valve.

[0058] Preferably, the float valve drilling tool can be applied to complex geological conditions with high temperature, high pressure and high sulfur content.

[0059] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the float valve drilling tool described above can refer to the corresponding process in the foregoing drilling float valve embodiments, which will not be described here.

[0060] The above description is only the preferred embodiment of the application and the description of the applied technical principles. Those skilled in the art should understand that the scope of the application involved in the application is not limited to the technical solutions formed by the specific combination of the above technical features, and also covers other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by replacing the above features with the technical features disclosed in the application (but not limited to) having similar functions.

[0061] It should be understood that the sequence numbers of the summary of the application and the steps in the embodiments do not absolutely mean the execution order, and the execution order of the processes should be determined according to the function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the application.

Claims

1. A novel double-barrier drilling float valve based on a Tesla valve, comprising a float valve section (1), characterized in that: The float valve section (1) is provided with a Tesla valve special flow channel (2) and a normal flow channel (3) connected by a channel. The special flow channel (2) of the Tesla valve and the ordinary flow channel (3) are respectively located at the upper and lower parts of the drilling float valve; The special flow channel (2) of the Tesla valve and the ordinary flow channel (3) are unidirectional fluid valves with the same direction, allowing drilling fluid to flow from the top to the bottom of the drilling float valve only; The ordinary flow channel (3) is provided with a pressure cap (4), a cone plug (5), a reset spring (6) and a base (7) arranged from top to bottom inside the channel. Both the pressure cap (4) and the base (7) are provided with flow holes for liquid to pass through; the cone plug (5) is connected to the base (7) through the return spring (6); The cone plug (5) can seal the flow hole in the middle of the pressure cap (4) when it is in contact with the pressure cap (4); The cone plug (5) can move up and down with the flow of drilling fluid; Even under extreme compression, the flow hole in the middle of the base (7) can still allow drilling fluid to pass through; The cone plug (5) is a cone-shaped structure that is narrow at the top and wide at the bottom.

2. The novel dual-barrier drilling float valve based on a Tesla valve according to claim 1, characterized in that: The cone plug (5) is made of hard alloy metal.

3. The novel dual-barrier drilling float valve based on a Tesla valve according to claim 1, characterized in that: The upper surface of the cone plug (5) is provided with a sealing ring, and the bottom of the pressure cap (4) is provided with a sealing groove that matches the sealing ring; when the sealing ring and the sealing groove are in contact, a sealing structure is formed.

4. The novel dual-barrier drilling float valve based on a Tesla valve according to claim 1, characterized in that: The float valve section (1) has a cylindrical structure.

5. A floating valve drill bit, characterized in that: Including the novel dual-barrier drilling float valve based on a Tesla valve as described in any one of claims 1-4.

6. The float valve drill bit according to claim 5, characterized in that: The floating valve drill bit can be applied to complex geological conditions with high temperature, high pressure, and high sulfur content.

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