Ultra-deep well high-strength thick-wall casing windowing device and application method

Abstract

The invention provides an ultra-deep well high-strength thick-wall casing windowing device and an application method. The device comprises a whipstock and a measurement-while-drilling module. The whipstock is used for descending to the windowing well depth along with a drill rod and comprises a milling shoe module, a whipstock and a setting anchoring mechanism. The milling shoe module comprises a flexible milling shoe and a pilot hole milling shoe; the measurement while drilling module is arranged at the setting anchoring mechanism and used for measuring well deflection and tool face information while drilling in real time so as to accurately swing the inclined face of the whipstock to the designed direction, the whipstock is set and fixed through the setting anchoring mechanism, and casing windowing operation is achieved. By the adoption of the device, the problems of frequent tripping, poor positioning precision, high windowing difficulty and low windowing time efficiency of ultra-deep well operation in the prior art can be solved, the whipstock real-time positioning function is achieved by installing the measurement-while-drilling module, and the positioning precision and the production time efficiency are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of optimizing casing window cutting in oil drilling, and particularly relates to a window cutting device and application method for ultra-deep well high-strength thick-wall casing. Background Art

[0002] In recent years, deep oil and gas resources represented by the northwest work area have gradually become the main oil and gas production areas in China. It can be found that the number of wellheads of casing window cutting sidetracks in Tahe Oilfield of Northwest Oilfield Branch shows an increasing trend year by year. It can be seen that the casing window cutting sidetrack technology in the deep oil and gas development project of Northwest Oilfield is becoming more and more mature.

[0003] With the implementation of the "Deep Earth Project" in Shunbei Oil and Gas Field, the number of ultra-deep wellheads has increased explosively, and more and more old wells are being exploited and reused. Compared with conventional window cutting, the ultra-deep well high-strength thick-wall casing has a high steel grade, a large wall thickness, and an ancient formation outside the pipe, which greatly increases the difficulty of window cutting. When the well depth exceeds 6500m, dual-joint positioning needs to be used for gyroscopic positioning, and the precise positioning of the whipstock is insufficient, increasing the difficulty of subsequent drilling operations; moreover, high-grade casing (steel grade ≥ P155V) has a high hardness and a large wall thickness (wall thickness ≥ 15.83mm), which requires high performance of the whipstock and milling tools. If conventional window cutting equipment is still used to cut windows in ultra-deep well high-strength thick-wall casing, there will be problems such as multiple technological processes, long operation time, low window cutting efficiency, and easy occurrence of downhole complications, and it is also easy to have problems such as difficult hardness matching, insecure setting, and reverse milling, affecting the construction progress of oil and gas development.

[0004] The information disclosed in the background art part of the present invention is only intended to deepen the understanding of the general background art of the present invention, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0005] To solve the above problems, the present invention provides a window cutting device and application method for ultra-deep well high-strength thick-wall casing, and provides a whipstock tool for ultra-deep well high-strength thick-wall casing with a positioning function. The purpose is to solve the problems of frequent tripping in ultra-deep well operations, poor precise positioning, and high window cutting difficulty. By installing a measurement-while-drilling module on the whipstock, it has the function of whipstock positioning on the basis of its original function, greatly improving the positioning accuracy and production efficiency; at the same time, optimizing the material and parameters of the sub-structure to enhance the functional stability. Preferably, in one embodiment, the device includes: a whipstock and a measurement-while-drilling module;

[0006] The whipstock is used to be lowered to the window cutting well depth along with the drill pipe, and includes a mill shoe module, a whipstock, and a setting and anchoring mechanism; the mill shoe module includes a flexible mill shoe and a pilot mill shoe;

[0007] The measurement-while-drilling module is disposed at the setting and anchoring mechanism, and is communicatively connected to the MWD system while drilling, and is used for measuring the well inclination and tool face information in real time while drilling and feeding back through the MWD system while drilling, so as to accurately swing the inclined plane of the whipstock to the designed azimuth, and fix the whipstock by the setting and anchoring device to realize the casing window cutting operation.

[0008] Preferably, in one embodiment, the measurement-while-drilling module at least includes a sensor unit, a main control unit and a wireless short-range transmission unit. The main control unit is used for processing the well inclination and tool face data measured by the sensor unit to generate orientation parameters, and transmitting the orientation parameters to the MWD system while drilling through the wireless short-range transmission unit.

[0009] In an alternative embodiment, the pilot mill uses a concentric double-diameter structure to establish a communication channel with the whipstock, and the size of the front part of the mill is smaller than that of the rear part; the material of the pilot mill is made of cemented carbide, and the whole is integrally welded.

[0010] Furthermore, in one embodiment, the designed deflection angle of the pilot mill is not less than 3.5°, with fewer ground inclined planes and not easily forming shoulders.

[0011] Preferably, in one embodiment, the whipstock adopts a double-step inclined plane structure to reduce the influence of dead points on the window cutting efficiency.

[0012] In one embodiment, the whipstock is made of a material with a hardness meeting the set conditions and is quenched and tempered, and at the same time, a coating is provided on the surface of the whipstock to balance hardness and brittleness and prevent milling fracture.

[0013] Furthermore, in an alternative embodiment, the distance between the inclined plane of the whipstock and the setting mechanism is increased to 2.56 m to improve the wear resistance of the inclined plane.

[0014] Preferably, in one embodiment, the setting and anchoring device is used to set and fix the whipstock, and the slip area in the setting and anchoring device is designed to increase by 15% to make the whipstock set more firmly.

[0015] In a preferred embodiment, the setting and anchoring device is provided with a high-temperature carburized thickness of 2 mm to ensure stronger setting stability.

[0016] Based on the application aspects of the device in any one or more of the above embodiments, the present invention further provides an application method of a high-strength thick-wall casing window cutting device for ultra-deep wells. The method is applied to the device in any one or more of the above embodiments, and the method includes the following operations:

[0017] The whipstock string is lowered to the window cutting depth through the drill pipe, and it is confirmed that the torque is completely released during the lowering process;

[0018] Based on the well inclination data and tool face data measured by the while drilling measurement module, the well inclination data and tool face data are fed back through the while drilling MWD system to accurately adjust the inclined surface of the high-strength deflector to the designed position;

[0019] After starting the pump, set the displacement of the anchor device, stabilize the pressure for a set time to wait for the anchor pin to shear, and achieve the setting of the whipstock;

[0020] Push out the slips of the sealing anchoring device. When the slips are fully pushed out until they hit the inner wall of the casing, the whipstock is firmly sealed. Shear the connecting bolts, lock the core shaft and the piston cylinder through the anti-retraction locking ring, and then realize the casing window opening operation.

[0021] Based on other aspects of the method described in the above embodiments, the present invention further provides a storage medium on which program codes for implementing the method described in the above embodiments are stored.

[0022] Compared with the closest prior art, the present invention also has the following beneficial effects:

[0023] The present invention provides an ultra-deep well high-strength thick-walled casing window opening device and an application method, the device comprising: a bevel and a measurement while drilling module; the bevel is used to drill down to the window opening well depth with the drill pipe, and comprises a grinding shoe module, a bevel guide, and a sealing and anchoring mechanism; the measurement while drilling module is arranged at the sealing and anchoring mechanism, and is used to measure the well inclination and tool face information in real time while drilling, so as to accurately swing the inclined surface of the bevel guide to the designed orientation, and the bevel is sealed and fixed by the sealing and anchoring device to realize the casing window opening operation. The device provided by the present invention has the function of real-time positioning of the bevel by installing the measurement while drilling module, which effectively improves the positioning accuracy, the bevel is firmly sealed, and the operation process is simple and reliable, and the production time efficiency is also effectively improved.

[0024] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0026] Figure 1 It is a structural schematic diagram of a high-strength thick-wall casing window opening device for ultra-deep wells provided by an embodiment of the present invention;

[0027] Figure 2It is a schematic structural diagram of the mill shoe module in the ultra-deep well high-strength thick-wall casing windowing device provided by the embodiments of the present invention;

[0028] Figure 3 It is a schematic structural diagram of the setting and anchoring device in the ultra-deep well high-strength thick-wall casing windowing device provided by the embodiments of the present invention;

[0029] Figure 4 It is a schematic diagram of the structural composition of the measurement-while-drilling module in the ultra-deep well high-strength thick-wall casing windowing device provided by the embodiments of the present invention;

[0030] Figure 5 It is an example diagram of the installation position of the measurement-while-drilling module in the ultra-deep well high-strength thick-wall casing windowing device provided by the embodiments of the present invention;

[0031] Figure 6 It is a schematic flow diagram of the application method of the ultra-deep well high-strength thick-wall casing windowing device provided by the embodiments of the present invention;

[0032] In the drawings, whipstock 1, pilot mill 2, flexible mill 3, whip guide 4, setting and anchoring device 5, measurement-while-drilling module 6, slips 7, instrument installation groove 8. Detailed implementation manners

[0033] The following will combine the drawings and embodiments to detail the implementation manners of the present invention, so that the implementers of the present invention can fully understand how the present invention uses technical means to solve technical problems and achieve the implementation process of technical effects, and implement the present invention specifically according to the above implementation process. It should be noted that as long as there is no conflict, each embodiment in the present invention and each feature of each embodiment can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.

[0034] Although the flowchart describes the operations as sequential processes, many of the operations can be performed in parallel, concurrently, or simultaneously. The order of the operations can be rearranged. When the operations are completed, the process can be terminated, but there can also be additional steps not included in the drawings. The process can correspond to a method, function, procedure, subroutine, subprogram, etc.

[0035] Computer devices include user devices and network devices. Among them, user devices or clients include, but are not limited to, computers, smartphones, PDAs (Personal Digital Assistants), etc.; network devices include, but are not limited to, a single network server, a server group composed of multiple network servers, or a cloud composed of a large number of computers or network servers based on cloud computing. The computer device can operate independently to implement the present invention, or can be connected to the network and implement the present invention through interactive operations with other computer devices in the network. The network where the computer device is located includes, but is not limited to, the Internet, wide area network, metropolitan area network, local area network, VPN network, etc.

[0036] The terms used herein are merely for describing specific embodiments and are not intended to limit the exemplary embodiments. Unless the context clearly indicates otherwise, the singular forms "a" and "an" used herein are also intended to include the plural. It should also be understood that the terms "comprising" and / or "including" used herein specify the presence of the stated features, integers, steps, operations, units, and / or components, and do not preclude the presence or addition of one or more other features, integers, steps, operations, units, components, and / or combinations thereof.

[0037] As an important technological means for dealing with casing damage wells, accident wells, and non-producing wells, the casing window sidetracking technology has the advantages of low drilling cost and quick production effect, and is increasingly widely used in oilfield development. In recent years, deep oil and gas resources represented by the northwest work area have gradually become the main oil and gas production areas in China. It can be found that the number of casing window sidetracking wells in Tahe Oilfield of Northwest Oilfield Company has shown an increasing trend year by year. It can be seen that the casing window sidetracking technology in the deep oil and gas development project of Northwest Oilfield is becoming more and more mature.

[0038] With the implementation of the "Deep Earth Project" in Shunbei Oil and Gas Field, the number of ultra-deep wells has increased explosively, and more and more old wells are being exploited and reused. Compared with conventional windowing, the high-strength thick-walled casing in ultra-deep wells has a high steel grade, a large wall thickness, and an ancient formation outside the pipe, which greatly increases the difficulty of windowing. When the well depth exceeds 6500m, dual-joint positioning is required for gyroscopic positioning, and the precise positioning of the whipstock is insufficient, increasing the professional difficulty of later drilling; moreover, high-strength thick-walled casings with a high steel grade (steel grade ≥ P155V) have a high hardness and a large wall thickness (wall thickness ≥ 15.83mm), which require high performance of the whipstock and milling tools. If conventional windowing equipment is still used to window the high-strength thick-walled casing in ultra-deep wells, there will be problems such as multiple process flows, long operation time, low windowing efficiency, and easy occurrence of downhole complications, and it is also easy to have situations such as difficult hardness matching, insecure setting, and reverse milling, which affect the construction progress of oil and gas development.

[0039] To solve the above problems, the present invention provides a high-strength thick-wall casing window-opening device for ultra-deep wells and an application method. In the embodiments of the present invention, a measurement-while-drilling module is installed on the whipstock, and the measurement-while-drilling module is used to measure the well inclination and tool face information in real time, enabling the window-opening device to have the function of whipstock positioning on the basis of its original functions, greatly improving the positioning accuracy and production efficiency; by optimizing the material and structure of the mill shoe, the performance and service life of the mill shoe body are improved; through the change of the distance, material and structure of the high-strength whipstock in combination with the unique design of the mill shoe, the influence of the dead point on the window-opening efficiency is minimized; the high-temperature setting and anchoring device can reach a temperature resistance of 300 °C, and the carburized thickness of the setting is higher, ensuring stronger setting stability.

[0040] Next, the structural components, connection methods and functional principles of the device in the embodiments of the present invention will be described in detail based on the accompanying drawings. Although the logical sequence of the operation of each functional structure is shown in the process of describing the operation principle of the device structure, in some cases, the operations shown or described can be executed in a different order than here.

[0041] Embodiment 1:

[0042] Figure 1 The structural schematic diagram of the high-strength thick-wall casing window-opening device for ultra-deep wells provided in Embodiment 1 of the present invention is shown. Referring to Figure 1 it can be seen that the equipment includes: a whipstock 1 and a measurement-while-drilling module 6;

[0043] The whipstock is used to be lowered to the window-opening well depth along with the drill pipe, and includes a mill shoe module, a whipstock 4 and a setting and anchoring mechanism 5;

[0044] The mill shoe module includes a pilot mill shoe 2 and a flexible mill shoe 3;

[0045] The measurement-while-drilling module 6 is arranged at the setting and anchoring mechanism, is communicatively connected with the measurement-while-drilling MWD system, and is used to measure the well inclination and tool face information in real time while drilling and feedback through the measurement-while-drilling MWD system, so as to accurately swing the inclined plane of the whipstock to the designed azimuth, and fix the whipstock by setting through the setting and anchoring device to realize the casing window-opening operation.

[0046] Applying the high-strength thick-wall casing window-opening device provided in the embodiments of the present invention can solve the problems of frequent tripping in and out of the well, poor precise positioning and high window-opening difficulty in ultra-deep well operations.

[0047] In the embodiments of the present invention, it is set that the measurement-while-drilling module 6 at least includes a sensor unit, a main control unit and a wireless short-range transmission unit. The main control unit is used to process the well inclination and tool face data measured by the sensor unit to generate orientation parameters, and transmit the orientation parameters to the measurement-while-drilling MWD system through the wireless short-range transmission unit, and then feedback to the ground operation system and / or the operator through the mud signal.

[0048] In the ultra-deep well high-strength thick-wall casing windowing device provided by the embodiment of the present invention, the pilot mill 2 is designed with a concentric double-diameter structure; the pilot mill 2 in the embodiment of the present invention adopts a concentric structure, which can effectively establish a communication channel with the whipstock to ensure the smooth flow of mud; in addition, the double-diameter mode is set such that the size of the front part of the mill is smaller than that of the rear part. The front part is used for windowing, and the rear part is used for window repair, which can ensure a good windowing effect while improving the windowing rate.

[0049] Furthermore, in the embodiment of the present invention, the material of the pilot mill 2 is imported high-quality alloy, and the overall adopts an integrated welding process. In an alternative embodiment, the pilot mill is integrally welded with cemented carbide material. For example, tungsten carbide cemented carbide can be used to improve the wear resistance of the structure of the pilot mill. The integrated welding process can save the component cost and ensure the overall stability of the combined structure, effectively reducing the probability of structural damage and failure. The deflection angle is optimized. The optimized design of the deflection angle in the present invention is not less than 3.5°; in actual application, a larger deflection angle is adopted, with fewer grinding guide surfaces, not easy to form shoulders, saving construction time; good wear resistance, geometric shape conducive to cutting, small cutting load, not easy to get stuck in the drill, and convenient for chip removal. The embodiment of the present invention improves the performance and service life of the mill body by optimizing the material and structure of the mill. For the optimized design value of the deflection angle, the embodiment of the present invention is not particularly limited, and any reasonable deflection angle value that can effectively achieve the expected technical effect can be adopted.

[0050] The flexible mill 3 is connected to the pilot mill through threads, and is used to make the window flat and smooth, which is easy for the drill string to pass through, as Figure 2 shown.

[0051] Preferably, in one embodiment, the whipstock 4 adopts a double-step inclined surface structure to reduce the influence of the dead point on the windowing efficiency and quickly form a window; with such a design, it can meet the windowing requirements, facilitate the quick formation of the window, and minimize the influence of the dead point on the windowing efficiency to the greatest extent;

[0052] Furthermore, the whipstock 4 is a high-strength whipstock, which is formed by quenching and tempering treatment with a set high-hardness optimized material, and at the same time adopts a high-strength coating; taking into account the best balance between hardness and brittleness to prevent milling fracture; in an alternative embodiment, the high-strength whipstock in the embodiment of the present invention is formed by quenching and tempering treatment with 42CrMo material, and the hardness can reach HB340-350. For the type of material used for the whipstock, the embodiment of the present invention is not particularly limited, and any reasonable material that meets the hardness requirements can be used.

[0053] Additionally, in the embodiments of the present invention, by increasing the distance between the inclined surface of the whipstock and the setting and anchoring device, the wear resistance of the inclined surface is improved; in practical applications, the distance between the inclined surface of the whipstock and the setting and anchoring device can be set to increase to 2.56 m; for the optimized design value of the distance between the inclined surface of the whipstock and the setting and anchoring device, the embodiments of the present invention are not particularly limited, and any reasonable distance value that can effectively achieve the expected technical effect can be adopted.

[0054] The function of the setting and anchoring device 5 is to set and fix the whipstock 1. In the embodiments of the present invention, by increasing the slip area and the carburizing thickness of the setting and anchoring device, its setting is made more firm; in an optional embodiment, the length of the slip can be set to increase by 5 cm and the area to increase by about 15%, as Figure 3 shown; in addition, the carburizing thickness of the setting and anchoring device is increased to 2 mm. Based on this, the setting and anchoring device can withstand a high temperature of 300 °C, and the higher carburizing thickness during setting ensures stronger setting stability.

[0055] In practical applications, the whipstock string of the windowing device is lowered to the windowing well depth through the drill pipe, and the drill string is moved up and down within a large range 3 times to confirm that the torque is completely released during the lowering process; then, according to the well inclination data and tool face data measured by the measurement-while-drilling module, the inclined surface of the high-strength whipstock is swung to the designed azimuth to accurately achieve the casing windowing operation.

[0056] During actual operation, the following logic is followed for operation:

[0057] First, start the pump and increase the displacement to the setting displacement of the setting and anchoring device, and maintain a stable pressure for a set duration to wait for the anchoring pin to shear. After setting is completed, for example, maintain a stable pressure for 3 min.

[0058] During this period, adjust the azimuth of the inclined surface of the whipstock according to the well inclination and tool face information measured by the measurement-while-drilling module. When it is determined that the whipstock string of the windowing device reaches the predetermined depth and azimuth, set and fix the whipstock; further, lift and lower the drill string; the overpull / underpush tonnage in this part does not exceed the shear tonnage of the bolts connecting the inclined surface and the mill shoe to confirm that the whipstock is firmly set;

[0059] Then continue to press down to the shear tonnage of the bolts connecting the inclined surface and the mill shoe to shear the connecting bolts;

[0060] After lifting the drill string by a set distance and then lowering the drill string again to confirm that the shear bolts have been cut. In practical applications, generally lift 0.5 m and then lower the drill string again; after all the above operations are performed correctly, further perform subsequent operations to achieve the casing windowing operation.

[0061] The measurement-while-drilling module 6 includes a sensor unit, a main control unit, a wireless short-range transmission unit, and a power supply unit, as Figure 4As shown; in an alternative embodiment, the measurement-while-drilling module is installed in the instrument installation groove 8 provided on the back of the high-strength whipstock 4.

[0062] The sensor, power supply unit, main control unit, and wireless short-range transmission unit are electrically connected and fixed on the circuit board of the measurement-while-drilling module. The circuit board is fixed in the instrument installation groove 8 by screws, as Figure 5 shown.

[0063] Furthermore, for the instrument installation groove 8 on the back of the high-strength whipstock 4, a metal sealing cover is installed on the outside of the installation groove, and a protective housing is fixedly installed outside the metal sealing cover.

[0064] The sensor unit is used to measure the well inclination and tool face information. Optionally, the sensor unit adopts a MEMS patch sensor;

[0065] The power supply unit is used to supply power to the main control unit, sensor unit, and wireless short-range transmission unit to make them work properly. Preferably, a button-type high-energy battery is adopted, which is small in size and convenient for installation;

[0066] The main control unit is used to receive sensor data, process the well inclination data and tool face data measured by the sensor unit to generate orientation parameters, and transmit the data through the wireless short-range transmission unit; the wireless short-range transmission unit uses electromagnetic wave transmission to send the orientation data to the measurement-while-drilling MWD system, and then feedback it to the ground operation platform and / or operator through the mud signal.

[0067] The ultra-deep well high-strength thick-wall casing window-opening device provided by the embodiment of the present invention installs a measurement-while-drilling module on the whipstock, so that it has the function of whipstock positioning on the basis of the original function, greatly improving the positioning accuracy and production efficiency.

[0068] In actual application, the well inclination and tool face data are measured by the measurement-while-drilling module to reliably swing the inclined surface of the high-strength whipstock 4 to the designed azimuth;

[0069] Specifically, when it is determined that the whipstock string of the window-opening device reaches the predetermined depth and azimuth, the pump is started, and the hydraulic oil pushes the piston to cut the pin under the action of the pump pressure. After the pin is cut, the mandrel continues to descend, so as to push out the slips 7 of the setting and anchoring device, set and fix the whipstock. When the slips 7 are completely pushed out until they abut against the inner wall of the casing, the firm setting of the whipstock is realized; furthermore, at this time, the mandrel and the piston cylinder are locked by the anti-retreat lock ring to prevent the slips from retracting after the pump is stopped.

[0070] A high-strength thick-wall casing window-opening device for ultra-deep wells and an application method provided by the present invention are provided with a measurement-while-drilling module at the setting and anchoring mechanism for measuring the well inclination and tool face information in real time while drilling, so as to accurately swing the inclined surface of the deflector to the designed azimuth, and fix the deflector by the setting and anchoring device to achieve high-quality casing window-opening operation. The device provided by the present invention has the real-time positioning function of the deflector, effectively improves the positioning accuracy, the deflector is firmly set, the operation process is simple and reliable, and the production efficiency is also effectively improved.

[0071] The present invention relates to a high-strength thick-wall casing window-opening device for ultra-deep wells and an application method, and provides a deflector tool for high-strength thick-wall casing window-opening in ultra-deep wells with a positioning function. Aiming at the problems that are prone to occur in drilling operations, such as difficult hardness matching, insecure setting, reverse milling, etc., a measurement-while-drilling module is arranged in the window-opening device to measure the well inclination and tool face information in real time, and overcome the problems faced by casing window-opening in ultra-deep wells, such as multiple process flows, long operation time, low window-opening efficiency, and prone to downhole complexity, and has good application prospects.

[0072] In the high-strength thick-wall casing window-opening device provided by the embodiment of the present invention, each module or unit structure can operate independently or in combination according to the actual operation connection requirements or signal processing requirements to achieve corresponding technical effects.

[0073] Embodiment 2:

[0074] In the above embodiments disclosed by the present invention, the device is described in detail. Based on other aspects of the device described in any one or more of the above embodiments, the present invention also provides an application method for a high-strength thick-wall casing window-opening device, and this method is applied to the high-strength thick-wall casing window-opening device described in any one or more of the above embodiments. Specific embodiments are given below for detailed description.

[0075] Specifically, Figure 6 The flow schematic diagram of the application method of the high-strength thick-wall casing window-opening device provided by the embodiment of the present invention is shown in Figure 6 As shown, this method includes:

[0076] The deflector string is lowered to the window-opening well depth through the drill pipe, and it is confirmed that the torque is completely released during the lowering process;

[0077] According to the well inclination data and tool face data measured by the measurement-while-drilling module, and through the feedback of the wireless short transmission unit and the measurement-while-drilling MWD system, the inclined surface of the high-strength deflector is swung to the designed azimuth;

[0078] After starting the pump, set the setting displacement of the anchoring device, and maintain the pressure for a set time to wait for the shear of the anchoring pin to achieve the setting of the deflector;

[0079] Push out the slips of the setting and anchoring device. When the slips are fully pushed out until they abut against the inner wall of the casing, the whipstock is firmly set. Shear the connecting bolts and lock the mandrel and the piston barrel through the anti-backoff locking ring, thereby realizing the casing windowing operation.

[0080] Among them, the ultra-deep well high-strength thick-wall casing windowing device adopted includes: a whipstock and a measurement-while-drilling module; the whipstock is used to be lowered to the windowing well depth along with the drill pipe, and includes a mill shoe module, a whipstock, and a setting and anchoring mechanism; the mill shoe module includes a flexible mill shoe and a pilot mill shoe;

[0081] The measurement-while-drilling module is arranged at the setting and anchoring mechanism, is communicatively connected with the measurement-while-drilling MWD system, and is used to measure the well inclination and tool face information in real time while drilling and feedback through the measurement-while-drilling MWD system, so as to accurately swing the inclined plane of the whipstock to the designed azimuth, and fix the whipstock through the setting and anchoring device to realize the casing windowing operation.

[0082] Preferably, in one embodiment, the measurement-while-drilling module at least includes a sensor unit, a main control unit, and a wireless short-range transmission unit. The main control unit is used to process the well inclination and tool face data measured by the sensor unit to generate orientation parameters, and transmit the orientation parameters to the measurement-while-drilling MWD system through the wireless short-range transmission unit, and then feedback to the ground operation system and / or the operator through the mud signal.

[0083] In an alternative embodiment, the pilot mill shoe adopts a concentric double-diameter structure, establishes a communication channel with the whipstock, and the size of the front part of the mill shoe is smaller than that of the rear part; the material of the pilot mill shoe is made of cemented carbide, and the whole adopts an integrated welding process.

[0084] Furthermore, in one embodiment, the designed deflection angle of the pilot mill shoe is not less than 3.5°, with fewer ground surfaces being ground, and it is not easy to form shoulders.

[0085] Preferably, in one embodiment, the whipstock adopts a double-step inclined plane structure to reduce the influence of the dead point on the windowing efficiency.

[0086] In one embodiment, the whipstock is made by quenching and tempering a material with a hardness meeting the set conditions, and at the same time, a coating is provided on the surface of the whipstock to balance hardness and brittleness and prevent milling fracture.

[0087] Furthermore, in an alternative embodiment, the distance between the inclined plane of the whipstock and the setting mechanism is increased to 2.56 m to improve the wear resistance of the inclined plane.

[0088] Preferably, in one embodiment, the setting and anchoring device is used to set and fix the whipstock. The slip area in the setting and anchoring device is designed to increase by 15%, making the whipstock set more firmly.

[0089] In a preferred embodiment, the setting and anchoring device is provided with a high-temperature carburized thickness of 2 mm to ensure stronger setting stability.

[0090] For the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0091] It should be noted that in other embodiments of the present invention, the method can also be combined with one or more of the above embodiments to obtain a new method for windowing high-strength thick-wall casing in ultra-deep wells or an application method of a windowing device, so as to optimize the technology of windowing high-strength thick-wall casing in ultra-deep wells.

[0092] It should be noted that based on the method in any one or more of the above embodiments of the present invention, the present invention also provides a storage medium on which program codes capable of implementing the method described in any one or more of the above embodiments are stored. When the codes are executed by an operating system, the application method of the high-strength thick-wall casing windowing device in ultra-deep wells as described above can be implemented.

[0093] It should be understood that the embodiments disclosed by the present invention are not limited to the specific structures, processing steps or materials disclosed herein, but should extend to equivalent alternatives of these features understood by those of ordinary skill in the relevant art. It should also be understood that the terms used herein are only for the purpose of describing specific embodiments and do not mean to limit.

[0094] The "one embodiment" mentioned in the specification means that the specific features, structures or features described in combination with the embodiment are included in at least one embodiment of the present invention. Therefore, the phrase "one embodiment" appearing throughout the specification does not necessarily refer to the same embodiment.

[0095] Although the disclosed embodiments of the present invention are as above, the content described is only an embodiment adopted for the convenience of understanding the present invention and is not used to limit the present invention. Any person skilled in the art within the technical field to which the present invention pertains can make any modifications and changes in the form of implementation and details without departing from the spirit and scope disclosed by the present invention. However, the scope of patent protection of the present invention shall still be subject to the scope defined by the appended claims.

Claims

1. A high-strength thick-wall casing windowing device for ultra-deep wells, characterized in that, The device includes: a whipstock and a measurement-while-drilling module; The whipstock is used to be lowered to the window-opening depth along with the drill pipe, and includes a mill shoe module, a whipstock, and a setting and anchoring mechanism; the mill shoe module includes a flexible mill shoe and a pilot mill shoe; The measurement-while-drilling module is arranged at the setting and anchoring mechanism, is communicatively connected with the MWD system while drilling, and is used to measure the well inclination and tool face information in real time while drilling and feedback through the MWD system while drilling, so as to accurately swing the inclined plane of the whipstock to the designed azimuth, and fix the whipstock by setting and anchoring through the setting and anchoring device, thereby realizing the casing window-opening operation.

2. The device according to claim 1, characterized in that, The measurement-while-drilling module at least includes a sensor unit, a main control unit, and a wireless short-range transmission unit. The main control unit is used to process the well inclination and tool face data measured by the sensor unit to generate orientation parameters, and transmit the orientation parameters to the MWD system while drilling through the wireless short-range transmission unit.

3. The device according to claim 1, characterized in that, The pilot mill shoe adopts a concentric double-diameter structure, establishes a communication channel with the whipstock, and the size of the front part of the mill shoe is smaller than that of the rear part; the material of the pilot mill shoe is made of cemented carbide, and the whole adopts an integrated welding process.

4. The device according to claim 1 or 3, characterized in that, The designed deflection angle of the pilot mill shoe is not less than 3.5°, with fewer ground inclined planes and not easy to form shoulders.

5. The device according to claim 1, characterized in that, The whipstock adopts a double-step inclined plane structure to reduce the influence of the dead point on the window-opening efficiency; the whipstock is made of a material with a hardness meeting the set conditions through quenching and tempering treatment, and at the same time, a coating is arranged on the surface of the whipstock to balance hardness and brittleness and prevent milling fracture.

6. The device according to claim 1, characterized in that, Increase the distance between the inclined plane of the whipstock and the setting mechanism to 2.56 m to improve the wear resistance of the inclined plane.

7. The device according to claim 1, characterized in that, The setting and anchoring device is used to set and fix the whipstock. It is designed that the area of the slips in the setting and anchoring device is increased by 15% to make the whipstock set more firmly.

8. The device according to claim 1, characterized in that, Set the setting and anchoring device to have a high-temperature carburizing thickness of 2 mm to ensure stronger setting stability.

9. A method for applying a high-strength thick-wall casing windowing device for ultra-deep wells, characterized in that, The method is applied to the device described in any one of claims 1 to 8, and the method includes the following operations: Lower the whipstock string to the window-opening depth through the drill pipe, and confirm that the torque is completely released during the lowering process; According to the well inclination data and tool face data measured by the measurement-while-drilling module, feedback the well inclination data and tool face data through the MWD system while drilling, so as to accurately swing the inclined plane of the high-strength whipstock to the designed azimuth; After starting the pump, set the setting displacement of the anchoring device, and keep the pressure stable for a set time to wait for the shear of the anchoring pins to realize the setting of the whipstock; Push out the slips of the setting and anchoring device. When the slips are completely pushed out until they abut against the inner wall of the casing, the whipstock is set firmly. Shear the connecting bolts, and lock the core shaft and the piston cylinder through the anti-backlash lock ring, thereby realizing the casing window-opening operation.

10. A storage medium, characterized in that, The program code for implementing the method described in claim 9 is stored on the storage medium.

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