An ultra-short radius lateral drilling angle building drill string, drill string system and application thereof

Abstract

The application discloses a kind of ultra-short radius side drilling angle build-up, drilling system and its application, the angle build-up can include: angle build-up transmission device and screw rod drilling assembly;Screw rod drilling assembly can include: swivel, transmission shaft and first bearing group;Swivel is connected with the guide housing of angle build-up transmission device;Transmission shaft and first bearing group are located inside swivel, and first bearing group is located between transmission shaft and swivel;Transmission shaft one end is connected with the flexible drill pipe component of angle build-up transmission device, the other end is circumscribed drill pipe component, to provide angle build-up transmission device with angle build-up power.By angle build-up transmission device and screw rod drilling assembly cooperation, to realize through elbow component, guide housing and the connection relationship of swivel to the elbow body tool face of elbow component is sought, to further be able to obtain the change of drilling direction in real time in the process of drilling, improve drilling accuracy.

Description

Technical Field

[0001] This invention relates to the field of oil drilling equipment technology, and in particular to an ultra-short radius side drilling tool, drilling tool system and its application. Background Technology

[0002] Some oilfields have already entered the high water-cut stage. Due to the severe heterogeneity within the thick oil layers, inefficient and ineffective water circulation is a serious problem. Inspection well and oilfield development dynamic data indicate that under vertical well production conditions, neither water flooding nor chemical flooding can solve the problem of inefficient and ineffective water circulation. A certain thickness of untapped or poorly drained oil layers still exist at the top of the thick oil layers in the oilfield.

[0003] Utilizing ultra-short radius sidetracking technology to drill into target oil-bearing formations increases the conductivity of the near-wellbore zone, providing an effective means to enhance production potential for exploiting this movable oil. The drill string for ultra-short radius sidetracking consists of multiple 0.152mm long drill pipes and flexible short sections connected by ball-cage universal joints. The free movement angle between the short sections is 4–6°, and the PDC drill bit is connected to the front end of the drill string. This technology allows for windowed sidetracking within 5 1 / 2” to 7” casing, applicable to target formations thicker than 22mm. The minimum build-up radius can reach 1.82mm, the borehole diameter is 11422mm, and the horizontal section length can reach 502mm (5 1 / 2” casing). Currently, this technology has been applied in several oilfields, resulting in an average daily oil production increase of 3–5 times after sidetracking, demonstrating a significant production enhancement effect. Summary of the Invention

[0004] The inventors discovered that existing ultra-short radius side-drilling technologies and tools have problems such as uncontrollable directional drilling trajectories and low target hit rates (target hit error ±30%), which seriously affect the application effect of this technology in reservoirs with strict wellbore orientation requirements. The inventors believe that there are three main problems with this technology: 1. During the ultra-short radius sidetracking directional drilling stage, existing sidetracking directional drilling tools enter the formation at the window opening. The orientation of the tool face (in this invention, the high-side tool face, which is the plane in the bending direction of the directional drilling tool, and the high-side tool face angle represents the angle between the plane in the bending direction of the directional drilling tool and the plane containing the wellbore azimuth angle) cannot be measured. At the start of drilling, it cannot be guaranteed that the drill string will drill in the pre-designed direction. 2. Due to the special structural limitations of existing directional drilling tools, traditional 2WD (measurement while drilling) methods are not compatible. Existing ultra-short radius sidetracking directional drilling tools do not have the ability to measure the azimuth and wellbore inclination while drilling, resulting in the inability to obtain the drilling direction in real time during drilling. Measurement can only be supplemented after drilling is completed. 3. The bent tool face of the directional drilling tool cannot be adjusted. During drilling, the wellbore inclination can only be adjusted by switching between the rigid and flexible states of the mechanical structure and the flexible drill string. However, it is not possible to accurately and effectively adjust the tool face orientation. The above three problems ultimately lead to a low target rate in the wellbore during directional drilling, which has become the main contradiction restricting the ability of ultra-short radius sidetracking technology to improve precision potential tapping.

[0005] In view of the above problems, the present invention is proposed to provide an ultra-short radius side-drilling directional drilling tool, drilling tool system and its application that overcomes or at least partially solves the above problems.

[0006] In a first aspect, embodiments of the present invention provide an ultra-short radius side drilling tool, which may include: a drilling tool transmission device and a screw drill assembly;

[0007] The screw drill assembly may include: a conversion joint, a drive shaft, and a first bearing assembly;

[0008] The conversion joint is connected to the guide housing of the directional drilling tool transmission device;

[0009] The drive shaft and the first bearing assembly are located inside the adapter joint, and the first bearing assembly is located between the drive shaft and the adapter joint;

[0010] One end of the drive shaft is connected to the flexible drill rod assembly of the directional drilling tool transmission device, and the other end is externally connected to the drill rod assembly to provide directional drilling power for the directional drilling tool transmission device.

[0011] Optionally, the screw drill assembly may further include: an upper connector;

[0012] One end of the upper connector is connected to the drive shaft and the conversion connector respectively, and the other end is used to connect to the external drill pipe assembly.

[0013] Optionally, the directional drilling tool transmission device may include:

[0014] Guide housing, flexible drill pipe assembly, and elbow assembly;

[0015] The flexible drill rod assembly is located inside the guide housing. The end of the flexible drill rod assembly away from the screw drill assembly is connected to the elbow assembly so as to transmit the directional drilling power provided by the drive shaft to the directional drilling bit of the elbow assembly through the flexible drill rod assembly.

[0016] The elbow body of the elbow assembly is connected to the guide housing, and the directional drill bit is embedded in the elbow body.

[0017] Optionally, the elbow assembly may include: an elbow body, an elbow end cap, an elbow housing, a second bearing assembly, an elbow ball head, and a directional drill bit;

[0018] The elbow end cap, the elbow housing, the second bearing assembly, and the elbow ball head are located inside the elbow body;

[0019] The elbow ball head is connected to the flexible drill pipe assembly via the elbow end cap. The elbow outer shell is sleeved on the outside of the elbow ball head and the elbow end cap. The elbow ball head is ball-jointed to the elbow end cap and the elbow outer shell respectively.

[0020] The elbow ball joint is connected to the directional drill bit, and the second bearing assembly is located between the directional drill bit and the elbow body.

[0021] Optionally, the elbow body is threadedly connected to the guide housing; and / or,

[0022] The elbow ball head and the directional drill bit are threaded together.

[0023] Optionally, the flexible drill pipe assembly includes: a plurality of ball head subs, ball head end caps, ball head shells, rollers, a centralizing ring, and a drill pipe joint;

[0024] Several ball-head short sections are connected end to end, and two adjacent ball-head short sections are connected by the ball-head end cap and the ball-head outer shell;

[0025] One end of the drill pipe joint is connected to the adjacent ball joint short section through the ball joint shell, and the other end is connected to the drive shaft; a set of rollers and the centering ring are sleeved on the outside of the drill pipe joint and abut against the ball joint shell connected thereto;

[0026] Multiple sets of rollers and the centering rings are respectively sleeved on the outside of the ball end cap and abut against the ball end shell.

[0027] Optionally, the ball end cap is nested outside the ball end section and hinged to the ball end of the adjacent ball end section; the ball end shell is sleeved on the outside of the ball end cap and the ball end of the adjacent ball end section.

[0028] Optionally, the roller is sleeved on the outside of the ball end cap and the outside of the drill pipe joint, and the centering ring is sleeved on the outside of the roller; and / or,

[0029] The drill pipe joint is threadedly connected to the drive shaft.

[0030] In a second aspect, embodiments of the present invention provide an ultra-short radius side drilling and directional drilling tool system, which may include: a drill pipe assembly and an ultra-short radius side drilling and directional drilling tool as described in the first aspect;

[0031] The drill pipe assembly is connected to the drive shaft.

[0032] Optionally, the drill pipe assembly may include: a directional sub, a square drill pipe, and several conventional drill pipes connected end to end;

[0033] One end of the directional sub is connected to the upper connector of the screw drill assembly, and the other end is connected to the adjacent conventional drill pipe;

[0034] The square drill rod is set on the ground and connected to the adjacent conventional drill rod.

[0035] Optionally, the system may also include: an orientation detection device, which may include: a pen tip, a continuous gyroscope inclinometer, a cable, and an orientation display;

[0036] The pen tip is connected to the continuous gyroscope inclinometer;

[0037] The continuous gyroscope inclinometer is electrically connected to the orientation display via the cable.

[0038] Optionally, the pen tip has a groove, and the directional section of the drill rod assembly has a pin that matches the groove.

[0039] The system may also include: a miniature storage inclinometer and a sealing ring;

[0040] The directional drilling bit of the directional drilling tool transmission device has an installation position, the miniature storage directional measuring instrument is installed in the installation position, and the sealing ring seals the installation position.

[0041] Thirdly, embodiments of the present invention provide an application of the ultra-short radius side-drilling tool as described in the first aspect in a drilling system.

[0042] The beneficial effects of the above-mentioned technical solutions provided in the embodiments of the present invention include at least the following:

[0043] This invention provides an ultra-short radius side-drilling directional drilling tool, a drilling system, and its application. By cooperating with a screw drill assembly, the directional drilling tool's drive mechanism provides the directional drilling power and positioning to the directional drilling tool. Furthermore, the connection between the elbow assembly, guide housing, and adapter joint enables the tracking of the elbow body tool face within the elbow assembly. Moreover, a continuous gyroscope can be used to measure the tool face orientation, allowing real-time acquisition of changes in the drilling direction during drilling, thus improving drilling accuracy.

[0044] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.

[0045] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0046] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0047] Figure 1 This is a schematic diagram of the structure of the ultra-short radius side drilling tool provided in an embodiment of the present invention;

[0048] Figure 2 This is a schematic diagram of the ultra-short radius side-drilling directional drilling tool system provided in an embodiment of the present invention;

[0049] Among them, 1-ultra-short radius side drilling tool; 2-drill pipe assembly; 3-azimuth detection device; 4-miniature storage inclinometer; 5-sealing ring;

[0050] 11-Drill bit drive; 12-Screw drill bit assembly; 21-Directional sub; 22-Square drill pipe; 23-Conventional drill pipe; 31-Pen tip; 32-Continuous gyro inclinometer; 33-Cable; 34-Azimuth indicator;

[0051] 111-Guide housing; 112-Flexible drill pipe assembly; 113-Elbow assembly; 121-Converter joint; 122-Drive shaft; 123-First bearing assembly; 124-Upper joint; 211-Pin; 311-Groove;

[0052] 1121-Ball head short section; 1122-Ball head end cap; 1123-Ball head housing; 1124-Roller; 1125-Straightening ring; 1126-Drill pipe joint; 1131-Angling drill bit; 1132-Elbow body; 1133-Elbow end cap; 1134-Elbow housing; 1135-Second bearing assembly; 1136-Elbow ball head; 11311-Mounting position. Detailed Implementation

[0053] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0054] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "far," "near," "front," and "rear," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this 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 this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0055] 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 can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0056] This invention provides an ultra-short radius side-drilling directional drilling tool, as described in the following embodiment. Figures 1-2As shown, the ultra-short radius side drilling directional drilling tool 1 may include: a directional drilling tool transmission device 11 and a screw drill assembly 12; the screw drill assembly 12 may include: a conversion joint 121, a drive shaft 122 and a first bearing assembly 123; the conversion joint 121 is connected to the guide housing 111 of the directional drilling tool transmission device 11; the drive shaft 122 and the first bearing assembly 123 are located inside the conversion joint 121, and the first bearing assembly 123 is located between the drive shaft 122 and the conversion joint 121; one end of the drive shaft 122 is connected to the flexible drill rod assembly 112 of the directional drilling tool transmission device 11, and the other end is externally connected to the drill rod assembly 2 to provide directional drilling power for the directional drilling tool transmission device 11.

[0057] The ultra-short radius side-drilling directional drilling tool provided in this embodiment of the invention, through the cooperation of the directional drilling tool transmission device and the screw drill assembly, provides directional drilling power and positioning to the directional drilling tool via the screw drill assembly. The inventors have constructed a shell guiding system by associating (connecting) the guide housing 111 of the directional drilling tool transmission device 11 and the conversion joint 121 in the screw drill assembly 12; and constructed an internal power transmission system by associating (connecting) the flexible drill rod assembly 112 and the elbow assembly 113 of the directional drilling tool transmission device 11 with the drive shaft 122 in the screw drill assembly 12. Furthermore, through the connection relationship between the elbow assembly, the guide housing, and the conversion joint, the elbow body tool face in the elbow assembly can be tracked. Moreover, the orientation (azimuth) of the tool face can be measured using a continuous gyroscope, thereby enabling real-time acquisition of changes in the drilling direction during drilling, improving drilling accuracy.

[0058] In this embodiment, the inventor addresses the technical challenge of being unable to measure the tool face of the bend in existing directional drilling tools where the power source is directly driven by the rotary table of the ground equipment, and the conductor shell is separated from the internal flexible drill rod assembly and bend assembly, making it impossible to track the orientation of the tool face of the bend assembly.

[0059] In an optional embodiment, refer to Figures 1-2 As shown, the above-mentioned screw drill assembly 12 may further include: an upper connector 124; one end of the upper connector 124 is connected to the drive shaft 122 and the conversion connector 121 respectively, and the other end is used to connect to the external drill pipe assembly 2.

[0060] In this embodiment of the invention, the outer surface of the upper connector 124 engages with the conversion connector 121 to achieve guidance, and the inner surface is connected to the drive shaft 122 to provide the drive shaft 122 with the tilting force, thus solving the interference problem when the transmission system and the guiding system are connected.

[0061] In another alternative embodiment, refer to Figures 1-2As shown, the directional drilling tool transmission device 11 may include: a guide housing 111, a flexible drill rod assembly 112, and an elbow assembly 113; the flexible drill rod assembly 112 is located inside the guide housing 111, and one end of the flexible drill rod assembly 112 away from the screw drill tool assembly 12 is connected to the elbow assembly 113 so as to transmit the directional drilling power provided by the drive shaft 122 to the directional drilling bit 1131 in the elbow assembly 113 through the flexible drill rod assembly 112; the elbow body 1132 of the elbow assembly 113 is connected to the guide housing 111, and the directional drilling bit 1131 is embedded in the elbow body 1132.

[0062] The guide housing 111 in the aforementioned directional drilling tool transmission device can only be bent on one side. When combined with the flexible drill rod assembly 112 and the elbow assembly 113, it can achieve directional drilling with fixed orientation.

[0063] In another alternative embodiment, refer to Figures 1-2 As shown, the elbow assembly 113 may include: a directional drill bit 1131, an elbow body 1132, an elbow end cap 1133, an elbow housing 1134, a second bearing assembly 1135, and an elbow ball head 1136; the elbow end cap 1133, the elbow housing 1134, the second bearing assembly 1135, and the elbow ball head 1136 are located inside the elbow body 1132; the elbow ball head 1136 is connected to the flexible drill pipe assembly 112 through the elbow end cap 1133, the elbow housing 1134 is sleeved on the outside of the elbow ball head 1136 and the elbow end cap 1133, and the elbow ball head 1136 is ball-jointed to the elbow end cap 1133 and the elbow housing 1134 respectively; the elbow ball head 1136 is connected to the directional drill bit 1131, and the second bearing assembly 1135 is located between the directional drill bit 1131 and the elbow body 1132.

[0064] In practical implementation, the elbow body 1132 and the guide housing 111 can be threaded together, so that the tool face of the elbow body can be tracked through the guide housing 111. Similarly, the elbow ball head 1136 and the directional drill bit 1131 can also be threaded together. In this embodiment, the elbow assembly 113 achieves azimuth-based directional drilling through the cooperation of its various components.

[0065] In an optional embodiment, refer to Figures 1-2As shown, the flexible drill pipe assembly 112 may include: a plurality of ball-end segments 1121, a ball-end cap 1122, a ball-end shell 1123, rollers 1124, a centralizing ring 1125, and a drill pipe joint 1126; the plurality of ball-end segments 1121 are connected end to end, and two adjacent ball-end segments 1121 are connected by the ball-end cap 1122 and the ball-end shell 1123; one end of the drill pipe joint 1126 is connected to the adjacent ball-end segment 1121 through the ball-end shell 1123, and the other end is connected to the drive shaft 122; a set of rollers 1124 and centralizing rings 1125 are sleeved on the outside of the drill pipe joint 1126 and abut against the ball-end shell 1123 connected thereto; multiple sets of rollers 1124 and centralizing rings 1125 are respectively sleeved on the outside of the ball-end cap 1122 and abut against the ball-end shell 1123.

[0066] In practice, the ball end cap 1122 is nested outside the ball end section 1121 and is hinged to the ball end of the adjacent ball end section 1121; the ball end shell 1123 is fitted on the outside of the ball end cap 1122 and the ball end of the adjacent ball end section 1121.

[0067] In practice, the roller 1124 is fitted on the outside of the ball end cap 1122 and the outside of the drill pipe joint 1126, and the straightening ring 1125 is fitted on the outside of the roller 1124; more specifically, the drill pipe joint 1126 is threadedly connected to the drive shaft 122.

[0068] In this embodiment, the guide shell bends and guides the drill under the combined action of drilling pressure and axial force during the drilling process. The flexible drill rod assembly transmits drilling torque during directional drilling, thereby successfully completing ultra-short radius side drilling with fixed azimuth and direction.

[0069] Based on the same inventive concept, this invention also provides an ultra-short radius side-drilling directional drilling tool system, referring to... Figures 1-2 As shown, the system may include: a drill pipe assembly 2 and the aforementioned ultra-short radius side drilling tool 1; the drill pipe assembly 2 is connected to a drive shaft 122. In a specific implementation, the drive shaft 122 is connected to the drill pipe assembly 2 via an upper connector 124 to transmit the directional drilling power.

[0070] In this embodiment of the invention, the inventor addresses the issue that existing directional drilling tools are not driven by a screw, but directly by a rotary table, with power derived from the rotary table of the drilling equipment. The original directional drilling tool's outer shell relies on its shape and friction for fixation, providing passive alignment and guidance. The flexible drill pipe enclosed by the outer shell is directly connected to the wellhead via the drill pipe, and the power transmission of the entire system is from the rotary table to the drill pipe, flexible drill pipe, and drill bit. The outer shell (guide shell) only bears the frictional forces of the well wall and the flexible drill pipe, as well as the bending moment. Therefore, it is impossible to adjust the tool face of the directional drilling tool's elbow through the operation of the entire transmission system. The guide shell is separate from the power transmission system, and the orientation of the elbow's tool face cannot be detected. This embodiment of the invention connects the elbow body, guide shell, adapter joint, and directional sub, making the tool face trackable, allowing for connection via a continuous gyroscope.

[0071] In another alternative embodiment, refer to Figures 1-2 As shown, the drill pipe assembly 2 may include: a directional short section 21, a square drill pipe 22, and several conventional drill pipes 23 connected end to end; one end of the directional short section 21 is connected to the upper connector 124 of the screw drill assembly 12, and the other end is connected to the adjacent conventional drill pipe 23; the square drill pipe 22 is set on the ground and connected to the adjacent conventional drill pipe 23.

[0072] It should be noted that the conventional drill rod in this embodiment is cylindrical, while the inventors innovatively proposed using a square drill rod to adjust the drilling azimuth. It should also be noted that the drilling footage required for directional drilling tools is generally only 3-5 meters. Therefore, by adjusting the number of conventional drill rods, the position of the square drill rod in the rotary table can be adjusted in one go, reserving sufficient drilling footage length, without the need for secondary tripping to add drill rods or tripping azimuth detection devices.

[0073] In the system described in this embodiment of the invention, the square drill rod 22 is mounted on the turntable of the ground equipment. The turntable transmits torque to the elbow body 1132 via the square drill rod 22, conventional drill rod 23, directional sub 21, upper connector 124, conversion connector 121, and guide housing 111. This allows for adjustment of the tool face of the elbow body 1132 to ensure the drilling azimuth matches the design azimuth. This embodiment of the invention solves the technical problem of the inability to measure and adjust the tool face during drilling in existing technologies. By adding precise intervention methods, the tool face can be adjusted in a timely manner to achieve the design objective when the drilling trajectory deviates.

[0074] In another alternative embodiment, refer to Figures 1-2 As shown, the system may also include: a position detection device 3, which may include: a pen tip 31, a continuous gyroscope inclinometer 32, a cable 33 and a position display 34; the pen tip 31 is connected to the continuous gyroscope inclinometer 32; the continuous gyroscope inclinometer 32 is electrically connected to the position display 34 via the cable 33.

[0075] In practice, the pen tip 31 has a groove 311, and the directional short section 21 of the drill rod assembly 2 has a pin 211 that matches the groove 311.

[0076] During measurement while drilling, the counterweight of the continuous gyro inclinometer 32 causes the groove 311 in the tip 31 to engage with the pin 211 on the directional sub 21, enabling real-time measurement of the tool face of the elbow body 1132 via the azimuth detection device 3. The azimuth changes are then displayed on the azimuth display 34 for the construction personnel to see. The personnel can then take timely intervention measures based on the azimuth changes displayed on the azimuth display 34 to achieve precise lateral drilling and directional drilling.

[0077] In another alternative embodiment, refer to Figures 1-2 As shown, the above system may also include: a miniature storage inclinometer 4 and a sealing ring 5;

[0078] The directional drilling bit 1131 of the directional drilling tool transmission device 11 has a mounting position 11311, in which the miniature storage inclinometer 4 is installed. A sealing ring 5 seals the mounting position 11311. In specific implementation, the mounting position of the directional drilling bit can be an inner hole, and the sealing ring closes the inner hole to form a sealed space, thereby protecting the miniature storage inclinometer.

[0079] In this embodiment of the invention, the miniature storage-type inclination meter 4 is installed in the directional drilling bit 1131. It can measure the well inclination and azimuth after drilling is completed. After drilling is completed, the directional drilling tool is brought out to the surface, the drill bit is disassembled, and the inclination meter is taken out. The well inclination and azimuth parameters can be read through a mobile app or software. The azimuth parameters are compared with the azimuth values ​​measured by the continuous gyroscope inclination meter to verify the wellbore trajectory azimuth. The well inclination data can be used to determine whether the well inclination angle after drilling meets the design requirements. If the deviation is relatively large, the wellbore can be adjusted appropriately in the next process.

[0080] Based on the same inventive concept, this embodiment of the invention also provides an application of the above-mentioned ultra-short radius side-drilling directional drilling tool in a drilling system.

[0081] When applying the ultra-short radius side-drilling directional drilling tool described in the embodiments of the present invention in a drilling system, refer to Figure 2 As shown, the specific steps can be divided into the following steps:

[0082] (1) Connect the directional drilling tool transmission device 11, screw drilling tool assembly 12, and micro storage directional measuring instrument 4 to the wellhead in sequence;

[0083] (2) Connect the screw drill assembly 12 and the drill pipe assembly 2, adjust the tool to the best state, adjust the number of conventional drill pipes 23 and the position of the square drill pipe 22 and the rotary table, reserve enough footage space, and lower the directional drilling tool to the bottom of the well to open the window;

[0084] (3) Lower the azimuth detection device into the well and use the counterweight of the continuous gyroscope inclinometer 32 to make the groove 311 and the pin 211 touch and lock together. Detect the tool face of the elbow body 1132 and observe whether the azimuth displayed on the azimuth display 34 is consistent with the design azimuth. If they are inconsistent, rotate the turntable. The turntable transmits torque to the elbow body 1132 through the square drill rod 22, conventional drill rod 23, directional short section 21, upper joint 124, conversion joint 121, and guide shell 111. Adjust the tool face of the elbow body 1132 to make the drilling azimuth consistent with the design azimuth.

[0085] (4) Start the pump, start the screw drill assembly, and begin directional drilling;

[0086] (5) Observe the advance and the tool face data measured by the continuous gyro inclinometer 32 at any time, and rotate the turntable in time to adjust the tool face of the directional drilling tool so that the directional drilling track always drills along the designed track;

[0087] (6) After the directional drilling is completed, first take out the continuous gyro inclinometer 32, then take out the drill pipe assembly 2, and then take out all the tools out of the wellhead in sequence.

[0088] (7) Disassemble the drill bit, take out the miniature storage inclinometer 4 to read the data, compare it with the data of the continuous gyroscope inclinometer 32, and determine whether the well inclination angle meets the design requirements.

[0089] The beneficial effects and specific implementations of the above-described system and application in the embodiments of the present invention can be referred to the section on directional drilling tools described above, and will not be repeated here.

[0090] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. This disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims. Thus, if these modifications and variations of the invention fall within the scope of the claims of the invention and their equivalents, the invention is also intended to include these modifications and variations.

Claims

1. A short-radius side-drilling directional drilling tool, characterized in that, include: Angled drilling tool transmission device and screw drilling tool assembly; The screw drill assembly includes: a conversion joint, a drive shaft, and a first bearing assembly; The conversion joint is connected to the guide housing of the directional drilling tool transmission device; The drive shaft and the first bearing assembly are located inside the adapter joint, and the first bearing assembly is located between the drive shaft and the adapter joint; One end of the drive shaft is connected to the flexible drill rod assembly of the directional drilling tool transmission device, and the other end is externally connected to the drill rod assembly to provide directional power for the directional drilling tool transmission device. The directional drilling tool transmission device includes: a guide housing, a flexible drill rod assembly, and an elbow assembly; The flexible drill rod assembly is located inside the guide housing. The end of the flexible drill rod assembly away from the screw drill assembly is connected to the elbow assembly so as to transmit the directional drilling power provided by the drive shaft to the directional drilling bit of the elbow assembly through the flexible drill rod assembly. The elbow body of the elbow assembly is connected to the guide housing, and the directional drill bit is embedded in the elbow body.

2. The directional drilling tool according to claim 1, characterized in that, The screw drill assembly also includes: an upper connector; One end of the upper connector is connected to the drive shaft and the conversion connector respectively, and the other end is used to connect to the external drill pipe assembly.

3. The directional drilling tool according to claim 1, characterized in that, The elbow assembly includes: an elbow body, an elbow end cap, an elbow housing, a second bearing assembly, an elbow ball head, and a directional drill bit; The elbow end cap, the elbow housing, the second bearing assembly, and the elbow ball head are located inside the elbow body; The elbow ball head is connected to the flexible drill pipe assembly via the elbow end cap. The elbow outer shell is sleeved on the outside of the elbow ball head and the elbow end cap. The elbow ball head is ball-jointed to the elbow end cap and the elbow outer shell respectively. The elbow ball joint is connected to the directional drill bit, and the second bearing assembly is located between the directional drill bit and the elbow body.

4. The directional drilling tool according to claim 3, characterized in that, The elbow body is threadedly connected to the guide housing; and / or The elbow ball head and the directional drill bit are threaded together.

5. The directional drilling tool according to claim 1, characterized in that, The flexible drill pipe assembly includes: several ball head subs, ball head end caps, ball head shells, rollers, a centralizing ring, and a drill pipe joint; Several ball-head short sections are connected end to end, and two adjacent ball-head short sections are connected by the ball-head end cap and the ball-head outer shell; One end of the drill pipe joint is connected to the adjacent ball joint short section through the ball joint shell, and the other end is connected to the drive shaft; a set of rollers and the centering ring are sleeved on the outside of the drill pipe joint and abut against the ball joint shell connected thereto; Multiple sets of rollers and the straightening rings are respectively sleeved on the outside of the ball end cap and abut against the ball end shell.

6. The directional drilling tool according to claim 5, characterized in that, The ball end cap is nested outside the ball end section and is hinged to the ball end of the adjacent ball end section; the ball end shell is sleeved on the outside of the ball end cap and the ball end of the adjacent ball end section.

7. The directional drilling tool according to claim 5, characterized in that, The roller is sleeved on the outside of the ball end cap and the outside of the drill pipe joint, and the centering ring is sleeved on the outside of the roller; and / or, The drill pipe joint is threadedly connected to the drive shaft.

8. A short-radius side-drilling directional drilling tool system, characterized in that, include: Drill pipe assembly and ultra-short radius side drilling tool as described in any one of claims 1 to 7; The drill pipe assembly is connected to the drive shaft.

9. The system according to claim 8, characterized in that, The drill pipe assembly includes: a directional sub, a square drill pipe, and several conventional drill pipes connected end to end; One end of the directional sub is connected to the upper connector of the screw drill assembly, and the other end is connected to the adjacent conventional drill pipe; The square drill rod is set on the ground and connected to the adjacent conventional drill rod.

10. The system according to claim 8 or 9, characterized in that, It also includes: an orientation detection device, which includes: a pen tip, a continuous gyroscope inclinometer, a cable, and an orientation display; The pen tip is connected to the continuous gyroscope inclinometer; The continuous gyroscope inclinometer is electrically connected to the orientation display via the cable.

11. The system according to claim 10, characterized in that, The pen tip has a groove, and the directional short section of the drill rod assembly has a pin that matches the groove.

12. The system according to claim 8 or 9, characterized in that, Also includes: Miniature storage inclinometer and sealing ring; The directional drilling bit of the directional drilling tool transmission device has an installation position, the miniature storage directional measuring instrument is installed in the installation position, and the sealing ring seals the installation position.

13. The application of an ultra-short radius side-drilling directional drilling tool as described in any one of claims 1 to 7 in a drilling system.

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