Pressure wave resonance excitation open type full-bore lower casing floating device and opening method

Abstract

The invention relates to a pressure wave resonance excitation open type full-bore lower casing floater and an opening method, the floater comprises a pressure oscillation generating device, a casing string and a floating coupling, and the pressure oscillation generating device is communicated with the casing string through a pipeline; the floating coupling is mounted on the casing string, and two ends of the floating coupling are respectively communicated with the casing string; a glass plate is fixedly installed in the floating coupling, and the space in the floating coupling is divided into two independent parts through the glass plate. The opening method is simple and reasonable in design, the glass plate can be exploded and broken from the inside by energy generated by oscillation wave resonance emitted by the pressure oscillation generating device, the whole glass plate is broken in an explosion mode, chippings are extremely small and completely broken, no cavity is generated in the middle, the chippings do not block a casing pipe and other downhole tools, and the service life of the casing pipe is prolonged. The problems that according to a traditional casing running floater, a mud replacing rubber plug is hung and clamped, opening is conducted in advance, opening cannot be conducted, chippings are large after opening is broken, and well cementation is complex due to blocking of other underground tools are effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas well cementing engineering, in particular to a pressure wave resonance exciting open full-gauge casing float and an opening method. BACKGROUND

[0002] With the continuous deepening of oil and gas field development, unconventional oil and gas resources have become an important real replacement resource. The main body technology of "long horizontal section horizontal well + segmented volume fracturing" is the main means for the development of unconventional oil and gas resources at present, but the safe running of casing in long horizontal section and more than 5000m ultra-long horizontal section horizontal well is an important factor restricting the speed and efficiency of drilling and completion. In long horizontal section horizontal well, the casing in long horizontal section will be deformed greatly under the joint action of its own gravity and wellbore bending, the contact area between the pipe string and the wellbore will increase, and the friction will be large, which will cause the casing to be unable to run to the designed well depth smoothly.

[0003] In order to solve this problem, efforts are usually made in improving the performance of drilling fluid filtrate, optimizing well trajectory design and pipe string structure, strengthening well passage measures, using rotary casing running and floating casing running technology, etc., which has achieved certain effect. Among them, the floating casing running technology is the most widely used due to its simple construction process and obvious effect. The principle of floating casing running technology is to inject low-density drilling fluid or directly fill air into the casing string at the bottom to reduce the floating weight of the casing in the wellbore, so as to reduce the friction of the casing running and improve the success rate of the casing running. When the floating casing running technology is completed, the casing is run to the designed well depth, and the casing is connected by opening the casing float, and then the subsequent cementing operation can be carried out.

[0004] The current floating casing running tool-casing float mainly has mechanical sliding sleeve type and rupture disc. Although the mechanical sliding sleeve type can adjust the opening pressure, the internal full-gauge cannot be truly realized, and the internal metal parts often do not fall automatically, the replacement plug is often stuck, and other complex situations occur during field application, which brings great risk to cementing operation. The existing rupture disc type rupture disc has a large opening pressure error during application due to the influence of the settlement stability of the drilling fluid in the well, and there are situations of premature opening and failure to open, which seriously affects the implementation of the floating casing running technology. In addition, when the rupture disc breaks, the whole rupture disc cannot be completely broken, and it is usually broken into a small hole at the central position. When the replacement plug passes through the casing float, there is a large pressure fluctuation, which can seriously damage the replacement plug, leading to cementing accidents, and the field application effect is greatly reduced. A casing float is urgently needed, which can be opened by other means and has full-gauge after opening, so as to improve the opening pressure accuracy of the casing float and the success rate of the floating casing running technology and improve the safe and efficient running capacity of the casing in long horizontal section horizontal well. SUMMARY

[0005] This invention provides a pressure wave resonance-excited openable full-bore casing floater and an opening method, aiming to solve the problems in the prior art.

[0006] The technical solution of the present invention to solve the above-mentioned technical problems is as follows:

[0007] A pressure wave resonance-excited open-type full-bore casing floater includes a pressure oscillation generator, a casing string, and a floating coupling. The pressure oscillation generator is connected to the casing string via a pipeline. The casing string has an L-shaped structure with a break in its horizontal section. The floating coupling is installed at the break, and its two ends are connected to the two ends of the break. A glass plate is fixedly installed inside the floating coupling, and the glass plate divides the space inside the floating coupling into two independent parts.

[0008] The beneficial effects of this invention are as follows: During the operation, S1: the floating coupling is lowered into the working well, and drilling fluid is filled into the casing string above the floating coupling; S2: a pump truck is used to pressurize the casing string at the wellhead, while a pressure oscillation generator sends a pressure wave with the same resonance frequency as the glass plate; S3: the amplitude of the pressure wave is continuously increased until the pressure wave reaches the floating coupling and resonates with the glass plate; when the resonance energy is greater than or equal to the breaking pressure of the glass plate, the glass plate pre-filled with high-pressure liquid bursts from the inside, completely destroying the glass plate, and the floating coupling is opened in full bore, which is convenient for subsequent operations.

[0009] The invention features a simple and rationally designed opening method. The glass plate can be shattered from the inside by the energy generated by the resonance of the shock wave emitted by the pressure oscillation generator. The glass plate is broken in an explosive manner, with extremely small and completely shattered fragments, without creating voids in the middle. The fragments do not block the casing or other downhole tools, effectively solving the problems of traditional casing floaters, such as stuck grout plugs, premature opening, inability to open, large fragments after opening, and blockage of other downhole tools leading to complex cementing.

[0010] Based on the above technical solution, the present invention can be further improved as follows.

[0011] Furthermore, the floating coupling includes an upper connector and a lower connector, one end of the upper connector is connected and communicates with one end of the lower connector, and the other end of the upper connector and the other end of the lower connector are respectively connected and communicate with the two ends of the break; the glass plate is installed inside one end of the lower connector.

[0012] The advantage of adopting the above-mentioned further solution is that the floating coupling adopts a separate upper and lower joint structure, which makes assembly convenient.

[0013] Furthermore, one end of the lower connector extends into one end of the upper connector and is threadedly connected to one end of the upper connector.

[0014] The advantage of adopting the above-mentioned further solution is that the upper and lower connectors are connected by threads, which makes assembly convenient and saves time and effort.

[0015] Furthermore, a limiting step is provided on the outer wall of the lower connector, and one end of the upper connector is in contact with the limiting step.

[0016] The advantages of adopting the above-mentioned further solution are that the structure is simple and the design is reasonable. By using the limiting step to hold one end of the upper connector, the stability of the assembly of the upper and lower connectors is further increased.

[0017] Furthermore, a joint sealing mechanism is installed between the outer wall of one end of the lower connector and the inner wall of one end of the upper connector.

[0018] The advantages of adopting the above-mentioned further solution are that the structure is simple and the design is reasonable. The sealing mechanism of the joint increases the sealing between the upper and lower joints to facilitate subsequent operations.

[0019] Furthermore, an annular step is provided inside one end of the upper connector, and one end of the lower connector extends into one end of the upper connector and fits against the annular step; a glass plate end face sealing mechanism is installed between one end face of the lower connector and the annular step.

[0020] The advantages of adopting the above-mentioned further solution are that the structure is simple and the design is reasonable. The use of the annular step to hold one end of the lower connector further increases the stability of the assembly of the upper and lower connectors.

[0021] Furthermore, a glass plate side sealing mechanism is installed between the edge of the glass plate and the inner wall of the lower connector.

[0022] The advantages of adopting the above-mentioned further solution are that the structure is simple and the design is reasonable. The sealing mechanism on the side of the glass plate increases the sealing between the glass plate and the lower joint, so as to facilitate the subsequent opening operation.

[0023] Furthermore, it also includes a cementing head, which is hollow inside and open at both ends. One end of the cementing head is connected to one end of the casing string and is provided with an interface. The pressure oscillation generator is connected to the interface through a pipeline.

[0024] The advantages of adopting the above-mentioned further scheme are that the structure is simple, and the cement head can be used to connect the pressure oscillation generator and the casing string on the one hand, and facilitate the installation of wellhead equipment on the other hand.

[0025] Furthermore, the glass plate includes a glass plate body, which is fixedly installed inside the floating coupling and has an installation cavity inside; the installation cavity is filled with high-pressure liquid.

[0026] The advantage of adopting the above-mentioned further solution is that the glass plate has a reasonable structural design, so that it can be broken under high pressure, thereby realizing the full-bore opening of the floating coupling.

[0027] This invention also relates to a method for achieving full-bore opening with a floating coupling, which is achieved by using a pressure wave resonance-excited full-bore lower casing floater as described above, and includes the following specific steps:

[0028] S1: Lower the floating coupling into the working well and fill the casing string above the floating coupling with drilling fluid.

[0029] S2: A pump truck is used at the wellhead to pressurize the casing string, while a pressure oscillation generator sends a pressure wave with the same resonant frequency as the glass plate.

[0030] S3: Continuously increase the amplitude of the pressure wave until the pressure wave is transmitted to the floating coupling and resonates with the glass plate; when the resonance energy is greater than or equal to the breaking pressure of the glass plate, the glass plate pre-filled with high-pressure liquid bursts from the inside, completely destroying the glass plate, and the floating coupling achieves full-bore opening.

[0031] The beneficial effect of adopting the above-mentioned further solution is that the present invention also provides a method for achieving full-bore opening with a floating coupling. This opening method is simple and reasonably designed. The glass plate is shattered from the inside by the power generated by resonance. The glass plate is broken in an explosive manner, with extremely small and completely broken fragments. No voids are generated in the middle, and the fragments do not block the casing or other downhole tools. This effectively solves the problems of traditional casing floaters, such as sticking and displacing the slurry plug, premature opening, inability to open, large fragments after breaking and opening, and blockage of other downhole tools, which leads to complex cementing. Attached Figure Description

[0032] Fig. 1 This is a schematic diagram of the overall structure of the present invention;

[0033] Fig. 2 This is a cross-sectional view of the floating coupling in this invention;

[0034] Fig. 3 This is a schematic diagram of the glass plate structure in this invention;

[0035] Fig. 4 This is a flowchart illustrating the opening of the floating coupling in this invention.

[0036] The attached diagram lists the components represented by each number as follows:

[0037] 1. Floating coupling; 2. Pressure oscillation generator; 3. Control device; 4. Cement head; 5. Casing string; 6. Upper connector; 7. Glass plate end face sealing mechanism; 8. Connector sealing mechanism; 9. Lower connector; 10. Glass plate; 11. Glass plate body; 12. High-pressure liquid; 13. Glass plate side sealing mechanism. Detailed Implementation

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0039] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0042] Example 1

[0043] like Figs. 1 to 4As shown, this embodiment provides a pressure wave resonance-excited open-type full-bore casing floater, including a pressure oscillation generator 2, a casing string 5, and a floating coupling 1. The pressure oscillation generator 2 is connected to the casing string 5 through a pipeline. The casing string 5 has an L-shaped structure with a break in its horizontal section. The floating coupling 1 is installed at the break, and its two ends are connected to the two ends of the break, respectively. A glass plate 10 is fixedly installed inside the floating coupling 1, and the glass plate 10 divides the space inside the floating coupling 1 into two independent parts.

[0044] During the operation, S1: The floating coupling is lowered into the working well, and drilling fluid is filled into the casing string 5 above the floating coupling 1; S2: The wellhead is pressurized by a pump truck into the casing string 5, while the pressure oscillation generator 2 sends a pressure wave with the same resonance frequency as the glass plate 10; S3: The amplitude of the pressure wave is continuously increased until the pressure wave reaches the floating coupling 1 and resonates with the glass plate 10; When the resonance energy is greater than or equal to the breaking pressure of the glass plate 10, the glass plate 10 is pre-filled with high-pressure liquid 12 and bursts from the inside, completely destroying the glass plate 10. The floating coupling 1 is then fully opened, making it easy to open for subsequent operations.

[0045] The implementation process of the above scheme is as follows: The floating coupling is lowered into the designed well depth along with the casing. The wellhead is connected to the cementing head. The pressure oscillation generator is connected to the injection interface of the cementing head via a union. Based on the lowering depth of the floating coupling and the pressure being pressed into the casing through the cementing head at the wellhead, the sum of the pressure and the pressure of the liquid column above the floating coupling is less than the breaking pressure of the high-strength glass plate, ensuring that the high-strength glass plate will not break prematurely. Then, the control device (control computer) controls the pressure oscillation generator to send an oscillating pressure wave with the same frequency as the floating coupling. According to the actual working conditions, while ensuring that the frequency of the pressure oscillation wave remains unchanged, the amplitude can be continuously increased to increase the energy of the oscillation wave until the oscillation wave can be effectively transmitted to the floating coupling and act on the high-strength glass plate. At this time, since the frequency of the pressure oscillation wave is the same as the frequency of the high-strength glass plate of the floating coupling, resonance occurs. The superposition of resonance energy causes the high-strength glass plate pre-filled with high-pressure liquid inside to explode from the inside, shattering the entire high-strength glass plate and realizing the full-bore opening of the casing floater.

[0046] The aforementioned pressure oscillation generator 2 is existing technology; it is a device capable of generating oscillation waves at different frequencies.

[0047] Preferably, this embodiment also includes a control device 3. The pressure oscillation generator 2 is connected to the control device 3 via a line or wireless communication, and the control device 3 controls the operation of the pressure oscillation generator 2.

[0048] In addition, the aforementioned control device 3 (control computer) is existing technology, and its function is to control the pressure oscillation generator 2 so that it can emit oscillation waves of different frequencies and energy levels as required.

[0049] It should be noted that the pressure oscillation generator 2 and control device 3 mentioned above are based on existing technologies, and their specific structures and principles will not be elaborated here.

[0050] The opening method of this embodiment is simple and reasonably designed. The glass plate can be shattered from the inside by the energy generated by the resonance of the shock wave emitted by the pressure oscillation generator. The glass plate is shattered in an explosive manner, with extremely small and completely broken fragments. No voids are generated in the middle, and the fragments do not block the casing or other downhole tools. This effectively solves the problems of traditional casing floaters, such as sticking to the slurry plug, premature opening, inability to open, large fragments after opening, and blockage of other downhole tools, which leads to complicated cementing.

[0051] Example 2

[0052] Based on Embodiment 1, in this embodiment, the floating coupling 1 includes an upper connector 6 and a lower connector 9. One end of the upper connector 6 is connected and communicates with one end of the lower connector 9. The other end of the upper connector 6 and the other end of the lower connector 9 are respectively connected and communicated with the two ends of the break. The glass plate 10 is installed inside one end of the lower connector 9.

[0053] The floating coupling 1 adopts a split structure of upper connector 6 and lower connector 9, which is convenient for assembly.

[0054] Alternatively, the aforementioned floating coupling 1 can also adopt an integrated structure of upper connector 6 and lower connector 9, but this structure is inconvenient for assembling the glass plate 10.

[0055] Preferably, in this embodiment, the upper connector 6 and the lower connector 9 are respectively cylindrical structures.

[0056] Example 3

[0057] Based on Embodiment 2, in this embodiment, one end of the lower connector 9 extends into one end of the upper connector 6 and is threadedly connected to one end of the upper connector 6.

[0058] The upper connector 6 and the lower connector 9 are connected by threads, which makes assembly convenient and saves time and effort.

[0059] Alternatively, other assembly methods can be used between the upper connector 6 and the lower connector 9, such as welding or bolting.

[0060] Example 4

[0061] Based on embodiment 3, in this embodiment, a limiting step is provided on the outer wall of the lower connector 9, and one end of the upper connector 6 is in contact with the limiting step.

[0062] The solution has a simple structure and a reasonable design. It uses a limiting step to hold one end of the upper connector 6, which further increases the stability of the assembly of the upper connector 6 and the lower connector 9.

[0063] Preferably, in this embodiment, the aforementioned limiting step is an annular platform.

[0064] Example 5

[0065] Based on any one of Embodiments 3 to 4, in this embodiment, a joint sealing mechanism 8 is installed between the outer wall of one end of the lower joint 9 and the inner wall of one end of the upper joint 6.

[0066] The scheme has a simple structure and reasonable design. It uses the joint sealing mechanism 8 to increase the sealing between the upper joint 6 and the lower joint 9 to facilitate subsequent operations.

[0067] Preferably, in this embodiment, the joint sealing mechanism 8 includes a plurality of sealing rings, which are evenly spaced along the axial direction of the lower joint 9.

[0068] In addition, multiple annular grooves are evenly spaced on the outer wall of the lower connector 9, and multiple sealing rings are installed in the multiple annular grooves respectively, with their outer sides tightly attached to the inner wall of the upper connector 6.

[0069] Example 6

[0070] Based on any one of Embodiments 3 to 5, in this embodiment, one end of the upper connector 6 is provided with an annular step, and one end of the lower connector 9 extends into one end of the upper connector 6 and fits against the annular step; a glass plate end face sealing mechanism 7 is installed between one end face of the lower connector 9 and the annular step.

[0071] The scheme has a simple structure and reasonable design. It uses an annular step to hold one end of the lower connector 9, which further increases the stability of the assembly of the upper connector 6 and the lower connector 9.

[0072] Preferably, in this embodiment, the glass plate end face sealing mechanism 7 includes a sealing ring, which is located between the end face of one end of the lower connector 9 and the annular step, with its two ends respectively fitting against the end face of one end of the lower connector 9 and the annular step.

[0073] Example 7

[0074] Based on any one of Embodiments 3 to 6, in this embodiment, a glass plate side sealing mechanism 13 is installed between the edge of the glass plate and the inner wall of the lower connector 9.

[0075] The solution has a simple structure and a reasonable design. It uses the side sealing mechanism 13 of the glass plate to increase the sealing between the glass plate 10 and the lower joint, so as to facilitate the subsequent opening operation.

[0076] Preferably, in this embodiment, the glass plate side sealing mechanism 13 includes a sealing ring, which is located between the glass plate 10 and the inner wall of the lower connector 9.

[0077] In addition, an annular groove is provided on the inner wall of the lower connector 9, and the sealing ring is installed in the annular groove, with its inner side in close contact with the edge of the glass plate 10.

[0078] Example 8

[0079] Based on the above embodiments, this embodiment also includes a cementing head 4, which is hollow inside and open at both ends. One end of the cementing head 4 is connected to one end of the casing string 5 and is provided with an interface. The pressure oscillation generating device 2 is connected to the interface through a pipeline.

[0080] The scheme has a simple structure. The cement head 4 can connect the pressure oscillation generator 2 and the casing string 5 on the one hand, and facilitate the installation of wellhead equipment on the other hand.

[0081] It should be noted that the cement head 4 mentioned above uses existing technology, and its specific structure and principle will not be described in detail here.

[0082] Example 9

[0083] Based on the above embodiments, in this embodiment, the glass plate 10 includes a glass plate body 11, which is fixedly installed in the floating coupling 1 and has an installation cavity therein; the installation cavity is filled with high-pressure liquid 12.

[0084] The glass plate 10 has a reasonable structural design so that it can be broken under high pressure, thereby enabling the full-bore opening of the floating coupling 1.

[0085] Preferably, in this embodiment, the glass plate 10 is a high-strength glass plate.

[0086] In addition, the resonant frequency of the high-strength glass plate is determined by the pressure of the internally pre-filled high-pressure liquid 12.

[0087] The aforementioned high-pressure liquid 12 specifically uses high-temperature hydraulic oil. In application, the glass plate 10 is composed of two plates joined together. The resonant frequency of the high-strength glass plate is mainly determined by its thickness, size, mass, and edge shape. Generally, the resonant frequency of the high-strength glass plate is inversely proportional to its thickness; that is, the greater the thickness, the lower the resonant frequency. Glass plates of the same material and size have essentially the same resonant frequency. However, the pressure at which the floating coupling opens downhole varies significantly depending on the density of the drilling fluid and the vertical depth. Therefore, it is necessary to change the resonant frequency of the high-strength glass plate to meet different pressure levels. Thus, high-pressure liquid is filled inside the glass plate. By varying the pressure and volume of the filling high-pressure liquid, the overall resonant frequency of the glass plate is altered, achieving different pressure breakage levels. Simultaneously, the internal high-pressure liquid releases a large amount of energy, resulting in more complete breakage of the glass plate.

[0088] Example 10

[0089] Based on the above embodiments, this embodiment also provides a method for achieving full-bore opening with a floating coupling, which is achieved by using a pressure wave resonance-excited full-bore lower casing floater as described above, including the following specific steps:

[0090] S1: Lower the floating coupling 1 into the working well and fill the casing string 5 with drilling fluid above the floating coupling 1.

[0091] S2: The pump truck is used to pressurize the casing string 5 at the wellhead, while the pressure oscillation generator 2 sends a pressure wave with the same resonance frequency as the glass plate 10.

[0092] S3: Continuously increase the amplitude of the pressure wave until the pressure wave is transmitted to the floating coupling 1 and resonates with the glass plate 10; when the resonance energy is greater than or equal to the breaking pressure of the glass plate 10, the glass plate 10 is pre-filled with high-pressure liquid and bursts from the inside, completely destroying the glass plate 10, and the floating coupling 1 achieves full-bore opening.

[0093] This embodiment also provides a method for achieving full-bore opening with a floating coupling. This opening method is simple and reasonably designed. The glass plate is shattered from the inside by the power generated by resonance. The glass plate is broken in an explosive manner, with extremely small and completely broken fragments. No voids are generated in the middle, and the fragments do not block the casing or other downhole tools. This effectively solves the problems of traditional casing floaters, such as sticking and replacing the slurry plug, premature opening, inability to open, large fragments after breaking and opening, and blockage of other downhole tools, which leads to complex cementing.

[0094] The specific implementation process of this invention is as follows:

[0095] Step 1: Connect the floating coupling 1 to the casing string 5 through the casing threads of the upper connector 6 and the lower connector 9. Do not fill the casing string below the floating coupling 1 with drilling fluid, that is, fill the casing string 5 below the floating coupling 1 with air to generate greater buoyancy downhole, thereby reducing the frictional resistance when the casing is run in.

[0096] Step 2: After the floating coupling 1 is inserted into the well, the casing string 5 above the floating coupling 1 needs to be filled with drilling fluid to increase the gravity of the upper casing string 5, increase the insertion load, and improve the casing insertion capacity.

[0097] Step 3: After the casing string 5 is lowered, the wellhead cementing head 4 is installed on the casing string 5 and connected to the cementing pipeline. One interface of the cementing head needs to be reserved for the use of the pressure oscillation generator 2. A pressure gauge needs to be equipped on the cementing head.

[0098] Step 4: Connect the pressure oscillation generator 2 to the reserved cement head 4 interface through the high-pressure pipeline and conduct a pressure stabilization test. The sum of the test pressure and the liquid column pressure in the casing string 5 above the floating coupling 1 should be less than the breaking pressure of the glass plate 10.

[0099] Step 5: Connect the control device 3 (i.e., the control computer in the prior art, equivalent to the controller in the prior art) to the pressure oscillation generator 2 via a signal control line.

[0100] Step 6: At the wellhead, use a pump truck to pressurize the casing string 5 through the cementing head 4. The sum of the pressurization pressure and the liquid column pressure in the casing string 5 above the floating coupling 1 should be less than the breaking pressure of the glass plate 10. It is recommended to be two-thirds of the breaking pressure of the glass plate 10.

[0101] The control device 3 (control computer) controls the pressure oscillation generator 2 to send a pressure wave with the same resonant frequency as the glass plate 10 to the cement head interface.

[0102] Step 7: Continuously increase the amplitude (energy) of the pressure wave until the pressure gauge on the cement head 4 suddenly drops to zero. Then the pressure wave is transmitted to the floating coupling 1 and resonates with the glass plate 10. When the resonance energy is greater than or equal to the breaking pressure of the glass plate 10, the high-pressure liquid 12 pre-filled in the glass plate 10 bursts from the inside, completely destroying the glass plate 10, and the floating coupling 1 achieves full-bore opening.

[0103] This process solves the problems and complexities of cementing accidents caused by conventional high-pressure glass plates breaking under liquid column pressure, where only a small hole is created in the center of the glass plate, while high-strength glass remains around the perimeter, leading to damage to the slurry plug and blockage of the slurry plug.

[0104] Compared with the prior art, the present invention has the following advantages:

[0105] The high-strength glass plate inside the floating coupling is pre-filled with high-pressure liquid. When the high-pressure liquid resonates, it generates huge energy to completely shatter the high-pressure glass plate. This avoids cementing accidents and complexities such as scratching the slurry plug and clogging the slurry plug caused by directly using the high-pressure glass plate and crushing it with the pressure of the liquid column, resulting in only a small hole in the center and high-strength glass remaining around it.

[0106] By applying pressure oscillation waves at the wellhead, the drilling fluid transmits the pressure oscillation waves. The frequency and amplitude of the oscillation waves can be arbitrarily adjusted on the ground by a control device (control computer), which greatly increases the success rate of opening the casing floater.

[0107] The advantage of this invention lies in achieving full-bore opening of the casing floater, which is crucial for the safe and smooth running of casing in long horizontal well sections. It reduces the risk of casing not being properly positioned, accelerates the casing running speed, reduces running time, improves the efficiency of casing running operations, and lowers drilling and completion costs. This invention can be operated from the wellhead surface, utilizing pressure wave resonance to excite the downhole floating coupling. By filling the glass plate of the floating coupling with high-pressure liquid, the resonant frequency of the glass plate is adjusted and changed. Through the superposition of resonant energy, the glass plate is completely broken from the inside.

[0108] It should be noted that all electronic components involved in this invention adopt existing technology, and all the above-mentioned components are electrically connected to the controller, and the control circuit between the controller and each component is existing technology.

[0109] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0110] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0111] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pressure wave resonance-excited open-type full-bore casing floater, characterized in that: The device includes a pressure oscillation generator (2), a sleeve string (5), and a floating coupling (1). The pressure oscillation generator (2) is connected to the sleeve string (5) through a pipeline. The sleeve string (5) has an L-shaped structure with a break in its horizontal section. The floating coupling (1) is installed at the break, and its two ends are connected to the two ends of the break. A glass plate (10) is fixedly installed inside the floating coupling (1), and the glass plate (10) divides the space inside the floating coupling (1) into two independent parts.

2. The pressure wave resonance-excited open-type full-bore lower casing float as described in claim 1, characterized in that: The floating coupling (1) includes an upper connector (6) and a lower connector (9). One end of the upper connector (6) is connected and communicates with one end of the lower connector (9). The other end of the upper connector (6) and the other end of the lower connector (9) are respectively connected and communicated with the two ends of the break. The glass plate (10) is installed inside one end of the lower connector (9).

3. The pressure wave resonance-excited open-type full-bore lower casing floater according to claim 2, characterized in that: One end of the lower connector (9) extends into one end of the upper connector (6) and is threadedly connected to one end of the upper connector (6).

4. The pressure wave resonance-excited open-type full-bore lower casing floater according to claim 3, characterized in that: The lower connector (9) has a limiting step on its outer wall, and one end of the upper connector (6) is in contact with the limiting step.

5. The pressure wave resonance-excited open-type full-bore lower casing floater according to claim 3, characterized in that: A joint sealing mechanism (8) is installed between the outer wall of one end of the lower joint (9) and the inner wall of one end of the upper joint (6).

6. The pressure wave resonance-excited open-type full-bore lower casing floater according to claim 3, characterized in that: An annular step is provided inside one end of the upper connector (6), and one end of the lower connector (9) extends into one end of the upper connector (6) and fits against the annular step; a glass plate end face sealing mechanism (7) is installed between one end face of the lower connector (9) and the annular step.

7. The pressure wave resonance-excited open-type full-bore lower casing floater according to claim 6, characterized in that: A glass plate side sealing mechanism (13) is installed between the edge of the glass plate and the inner wall of the lower connector (9).

8. The pressure wave resonance-excited open-type full-bore lower casing floater according to any one of claims 1-7, characterized in that: It also includes a cementing head (4), which is hollow inside and open at both ends. One end of the cementing head (4) is connected to one end of the casing string (5) and has an interface. The pressure oscillation generator (2) is connected to the interface through a pipeline.

9. The pressure wave resonance-excited open-type full-bore lower casing floater according to any one of claims 1-7, characterized in that: The glass plate (10) includes a glass plate body (11), which is fixedly installed inside the floating coupling (1) and has an installation cavity; the installation cavity is filled with high-pressure liquid (12).

10. A method for achieving full-bore opening with a floating coupling, characterized in that: The pressure wave resonance excitation open-type full-bore casing floater as described in any one of claims 1-9 is used, and includes the following specific steps: S1: Lower the floating coupling (1) into the working well and fill the part of the casing string (5) above the floating coupling (1) with drilling fluid; S2: The pump truck is used to pressurize the casing string (5) at the wellhead, while the pressure oscillation generator (2) sends a pressure wave with the same resonance frequency as the glass plate (10); S3: Continuously increase the amplitude of the pressure wave until the pressure wave is transmitted to the floating coupling (1) and resonates with the glass plate (10); when the resonance energy is greater than or equal to the breaking pressure of the glass plate (10), the glass plate (10) pre-filled with high-pressure liquid bursts from the inside, completely destroying the glass plate (10), and the floating coupling (1) achieves full-bore opening.

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