A small-diameter steel pipe drill pipe used in ultra-deep well conditions

Abstract

The present invention relates to the technical field of drill pipes, and specifically to a small-diameter steel pipe drill pipe used in ultra-deep well working conditions, comprising a drill string, a connecting head, a connecting seat and a limit assembly, the connecting head being fixedly connected to one end of the drill string, the connecting seat being fixedly connected to the drill string, the connecting seat being located at an end of the drill string away from the connecting head, the connecting head being provided with a threaded column, the connecting seat having a threaded hole adapted for the threaded column, the limit assembly comprising a mounting ring, a first spring and a plurality of limit columns, the two ends of the first spring being fixedly connected to the mounting ring and the connecting head respectively, the first spring being located inside the mounting cavity, the mounting ring being slidably connected to the connecting head, the mounting ring being located inside the mounting cavity, the plurality of limit columns being fixedly connected to the mounting ring respectively and being arranged inside the limit cavity, the plurality of limit columns being arranged around the circumference of the threaded column, the connecting seat having a limit groove adapted for the limit column, and the limit assembly being able to limit relative rotation between the two drill pipes, thereby improving the connection effect between the two drill pipes.

Description

Technical Field

[0001] The present invention relates to the technical field of drill rods, and in particular to a small-diameter steel pipe drill rod used in ultra-deep well working conditions. Background Art

[0002] Drill rods are required during ultra-deep well operations. As the drilling progresses and the hole becomes deeper and deeper, the length of the drill rod needs to be increased, so the drill rods need to be connected to each other.

[0003] Currently, the connection between drill rods is generally performed through threads. Although the connection method is relatively simple, the drill rods are prone to loosening, thereby affecting the connection effect between the drill rods. Summary of the Invention

[0004] The object of the present invention is to provide a small-diameter steel pipe drill rod for use in ultra-deep well working conditions, which can improve the connection effect between drill rods.

[0005] To achieve the above-mentioned object, the present invention provides a small-diameter steel pipe drill pipe for use in ultra-deep well working conditions, comprising a drill string, a connector, a connector seat, and a limit assembly, wherein the connector is fixedly connected to one end of the drill string, the connector seat is fixedly connected to the drill string, the connector seat is located at an end of the drill string away from the connector, the connector is provided with a threaded column, and the connector seat has a threaded hole adapted to the threaded column;

[0006] The limiting assembly includes a mounting ring, a first spring and a plurality of limiting columns. The connecting head has a connecting cavity and a limiting cavity that are connected. The two ends of the first spring are fixedly connected to the mounting ring and the connecting head respectively. The first spring is located inside the mounting cavity. The mounting ring is slidably connected to the connecting head. The mounting ring is located inside the mounting cavity. The plurality of limiting columns are fixedly connected to the mounting ring respectively and are arranged inside the limiting cavity. The plurality of limiting columns are arranged around the circumference of the threaded column. The connecting seat has a limiting groove that is adapted to the limiting column.

[0007] Wherein, the limiting assembly further includes a fixing plate, the fixing plate is fixedly connected to the connecting head, and the fixing plate is located on the side of the installation cavity.

[0008] Among them, the fixing plate includes a shielding part and a supporting part, the supporting part is arranged in a block shape, the supporting part is fixedly connected to the shielding part, the supporting part is located on the side of the shielding part, and connecting parts are provided at both ends of the shielding part, and the connecting part and the shielding part are integrally formed.

[0009] Wherein, the connecting portion is provided with a positioning piece, the connecting head has a positioning groove adapted to the positioning piece, and the positioning piece is located inside the positioning groove.

[0010] The mounting ring has a receiving cavity, a toggle structure is provided inside the receiving cavity, and the toggle structure includes a second spring and a movable frame. The two ends of the second spring are fixedly connected to the mounting ring and the movable frame respectively, and the movable frame is slidably connected to the mounting ring.

[0011] The present invention relates to a small-diameter steel pipe drill pipe used in ultra-deep well conditions. After the two drill pipes are connected, the threaded column of one drill pipe cooperates with the threaded hole of the other drill pipe to fix the two drill pipes. The first spring and the limiting column are respectively located on both sides of the mounting ring. The first spring supports the mounting ring so that the limiting column of the drill pipe extends from the limiting cavity and enters the limiting groove of the other drill pipe for clamping, thereby preventing relative rotation between the two drill pipes and preventing loosening between the two drill pipes, thereby improving the connection effect between the two drill pipes. When the two drill pipes need to be disassembled, the mounting ring is moved to withdraw the limiting column from the limiting groove, and the threaded column can be screwed out of the threaded hole, so that the two drill pipes can be disassembled. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art.

[0013] Figure 1 This is a cross-sectional view of Example 1 of the present invention.

[0014] Figure 2 The present invention Figure 1 A partial enlarged view of point A in the middle.

[0015] Figure 3 The present invention Figure 2 Cross-sectional view at the middle BB.

[0016] Figure 4 It is a cross-sectional view of Example 2 of the present invention.

[0017] Figure 5 The present invention Figure 4 A partial enlarged view of point C in the middle.

[0018] Figure 6 This is a cross-sectional view of Example 3 of the present invention.

[0019] Figure 7 The present invention Figure 6 A partial enlarged view of point D in the middle.

[0020] 101-drill string, 102-connecting head, 103-connecting seat, 104-threaded column, 105-threaded hole, 106-mounting ring, 107-first spring, 108-limiting column, 109-mounting cavity, 110-limiting cavity, 111-fixing plate, 112-shielding portion, 113-supporting portion, 114-positioning plate, 115-positioning groove, 116-limiting groove, 117-connecting portion, 201-accommodating cavity, 202-second spring, 203-movable frame, 301-shielding ring, 302-through hole, 303-connecting ring, 304-annular cavity, 305-groove. DETAILED DESCRIPTION

[0021] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0022] Example 1:

[0023] See also Figures 1 to 3 , Figure 1 is a cross-sectional view of Example 1 of the present invention, Figure 2 The present invention Figure 1 A partial enlarged view of point A in the middle. Figure 3 The present invention Figure 2 Cross-sectional view at the middle BB.

[0024] The present invention provides a small-diameter steel pipe drill pipe for ultra-deep well working conditions, comprising a drill string 101, a connector 102, a connector seat 103 and a limit assembly, wherein the limit assembly comprises a mounting ring 106, a first spring 107, a fixing plate 111 and a plurality of limit columns 108;

[0025] According to this specific embodiment, the connector 102 is fixedly connected to one end of the drill string 101, the connector seat 103 is fixedly connected to the drill string 101, the connector seat 103 is located at the end of the drill string 101 away from the connector 102, the connector 102 is provided with a threaded column 104, the connector seat 103 has a threaded hole 105 adapted to the threaded column 104, the connector 102 has a connecting installation cavity 109 and a limiting cavity 110, the two ends of the first spring 107 are respectively connected to the mounting ring 106 is fixedly connected to the connector 102, the first spring 107 is located inside the mounting cavity 109, the mounting ring 106 is slidably connected to the connector 102, the mounting ring 106 is located inside the mounting cavity 109, a plurality of limiting posts 108 are respectively fixedly connected to the mounting ring 106 and pass through the limiting cavity 110, a plurality of limiting posts 108 are arranged around the circumference of the threaded post 104, and the connecting seat 103 has a limiting groove 116 that matches the limiting posts 108. The connector 102 and the connecting seat 103 are welded to both ends of the drill string 101 to facilitate connecting two drill rods. The threaded post 104 is matched with the threaded hole 105 to facilitate threaded connection between the two drill rods. The limiting assembly is used to limit the rotation of the two drill rods after they are connected, so that the two connected drill rods do not rotate relative to each other. After the two drill rods are connected, the threaded column 104 of one drill rod cooperates with the threaded hole 105 of the other drill rod to fix the two drill rods. The first spring 107 and the limiting column 108 are respectively located on both sides of the mounting ring 106. The first spring 107 supports the mounting ring 106, so that the limiting column 108 of the drill rod extends from the limiting cavity 110 and enters the limiting groove 116 of the other drill rod for clamping. This prevents relative rotation between the two drill rods and prevents loosening between the two drill rods, thereby improving the connection effect between the two drill rods. When the two drill rods need to be disassembled, the mounting ring 106 is moved to withdraw the limiting column 108 from the limiting groove 116. The threaded column 104 can then be unscrewed from the threaded hole 105, and the two drill rods can be disassembled.

[0026] Furthermore, the fixing piece 111 is fixedly connected to the connector 102 and is located on the side of the installation cavity 109. The side of the installation cavity 109 has an opening to facilitate the operation of the installation ring 106 by the staff. The fixing piece 111 is used to cover the opening, thereby sealing the installation cavity 109.

[0027] Specifically, the fixing plate 111 includes a shielding portion 112 and a supporting portion 113. The supporting portion 113 is block-shaped and fixedly connected to the shielding portion 112. The supporting portion 113 is located on the side of the shielding portion 112. Connecting portions 117 are provided at both ends of the shielding portion 112. The connecting portions 117 are integrally formed with the shielding portion 112. The shielding portion 112 is used to shield the installation cavity 109, and the connecting portion 117 is used to fix the fixing plate 111 and the connecting head 102. The connecting portion 117 and the connecting head 102 are fixed by bolts. After the fixing plate 111 is fixed to the connecting head 102, the supporting portion 113 is inserted into the installation cavity 109 to support the installation ring 106, so that the position of the installation ring 106 cannot be moved, thereby fixing the installation ring 106, and then fixing the limiting column 108, so that the limiting column 108 is always inserted in the limiting groove 116 to maintain the connection effect between the two drill rods. When it is necessary to disassemble the two drill rods, first remove the fixing plate 111 from the connector 102 so that the abutting portion 113 no longer abuts the mounting ring 106. The mounting ring 106 can then slide inside the mounting cavity 109 to allow the limiting column 108 to withdraw from the limiting groove 116, thereby disassembling the two drill rods.

[0028] Secondly, the connecting portion 117 is provided with a positioning piece 114. The connector 102 has a positioning groove 115 adapted to the positioning piece 114, and the positioning piece 114 is located inside the positioning groove 115. The positioning piece 114 is used to position the fixing piece 111. When the fixing piece 111 is installed on the connector 102, the positioning piece 114 is aligned with the positioning groove 115 and inserted to position the fixing piece 111, thereby facilitating the installation of the fixing piece 111.

[0029] When the small-diameter steel pipe drill pipe used in ultra-deep well conditions of this embodiment is used to connect two drill pipes, the fixing plate 111 is first removed from the connector 102, and the mounting ring 106 is moved to make the limiting column 108 completely retract into the limiting cavity 110. At this time, the threaded column 104 of one drill pipe is screwed into the threaded hole 105 of the other drill pipe for connection. After tightening, the mounting ring 106 is loosened. The mounting ring 106 is supported by the first spring 107 and moves in a direction opposite to the limit cavity 110. The interior of the installation cavity 109 slides, and at this time the limiting column 108 enters the limiting groove 116 for clamping, so that the two drill rods cannot rotate relative to each other, thereby improving the connection effect when the two drill rods are connected, and then the fixing plate 111 is installed on the connecting head 102, so that the supporting portion 113 supports the installation ring 106, thereby fixing the position of the installation ring 106, so that one end of the limiting column 108 is always in the limiting groove 116, so as to improve the connection effect.

[0030] Example 2

[0031] Based on Example 1, please refer to Figure 4 and Figure 5 , Figure 4 is a cross-sectional view of Example 2 of the present invention, Figure 5 The present invention Figure 4 A partial enlarged view of point C in the middle.

[0032] The mounting ring 106 of the small-diameter steel pipe drill pipe used in ultra-deep well working conditions of the present invention has an accommodating cavity 201. A toggle structure is provided inside the accommodating cavity 201. The toggle structure includes a second spring 202 and a movable frame 203. The two ends of the second spring 202 are fixedly connected to the mounting ring 106 and the movable frame 203, respectively. The movable frame 203 is slidably connected to the mounting ring 106. The toggle structure is used to toggle the mounting ring 106 to facilitate the movement of the mounting ring 106. The second spring 202 abuts the movable frame 203 to push the movable frame 203 out of the accommodating cavity 201, so that the movable frame 203 extends out of the connector 102. This allows a worker to toggle the mounting ring 106 located inside the mounting cavity 109 by toggling the movable frame 203, making the movement of the mounting ring 106 more convenient.

[0033] When connecting two drill rods using the small-diameter steel pipe drill rod for ultra-deep well working conditions of this embodiment, first remove the fixing plate 111 from the connector 102. At this time, the movable frame 203 is supported by the second spring 202 and extends out of the mounting cavity 109. Move the movable frame 203 to move the mounting ring 106, so that the limiting column 108 is completely retracted into the limiting cavity 110. At this time, screw the threaded column 104 of one drill rod into the threaded hole 105 of the other drill rod for connection. After tightening, loosen the mounting ring 106. The mounting ring 106 slides inside the mounting cavity 109 under the support of the first spring 107. At this time, the limiting column 108 enters the limiting groove 116 for clamping, so that the two drill rods cannot rotate relative to each other, thereby improving the connection effect when the two drill rods are connected. The fixing plate 111 is then installed on the connecting head 102, so that the supporting portion 113 supports the mounting ring 106, thereby fixing the position of the mounting ring 106 and making one end of the limiting column 108 always in the limiting groove 116 to improve the connection effect.

[0034] Example 3

[0035] Based on Example 2, please refer to Figure 6 and Figure 7 , Figure 6 is a cross-sectional view of Example 3 of the present invention, Figure 7 The present invention Figure 6 A partial enlarged view of point D in the middle.

[0036] A small-diameter steel pipe drill pipe used in ultra-deep well conditions according to the present invention further includes a blocking ring 301, which is rotatably connected to the connector 102 and is provided with a through hole 302. The blocking ring 301 is used to block the limiting cavity 110, thereby limiting the position of the limiting column 108. The blocking ring 301 can block the limiting column 108 in the limiting cavity 110 to facilitate connection between the two drill pipes. When the connection is completed, the blocking ring 301 can be rotated so that the through hole 302 coincides with the limiting cavity 110. At this time, the limiting column 108 can pass through the through hole 302 and enter the limiting groove 116 for clamping, thereby improving the connection effect between the two drill pipes.

[0037] In addition, the shielding ring 301 is provided with a connecting ring 303, and the connector 102 has an annular cavity 304 adapted to the connecting ring 303. The connecting ring 303 is located inside the annular cavity 304. The connecting ring 303 can rotate inside the annular cavity 304. The connecting ring 303 and the annular cavity 304 cooperate with each other to achieve a rotational connection between the shielding ring 301 and the connector 102.

[0038] Secondly, the side of the shielding ring 301 is provided with a plurality of grooves 305, and the plurality of grooves 305 are arranged around the axis of the shielding ring 301. The outer side of the shielding ring 301 is provided with a plurality of grooves 305, so that the staff can rotate the shielding ring 301 through the grooves 305.

[0039] When the small-diameter steel pipe drill pipe used in ultra-deep well conditions of this embodiment is used to connect two drill pipes, the limit column 108 can be pressed to make the limit column 108 retreat into the limit cavity 110, and the blocking ring 301 can be rotated to make the through hole 302 and the limit groove 116 misaligned, so that the limit column 108 can be blocked in the limit cavity 110. At this time, the threaded column 104 of one drill pipe is screwed into the threaded hole 105 of the other drill pipe for connection, and the mounting ring 106 is loosened after tightening. The mounting ring 106 is in The first spring 107 slides inside the mounting cavity 109 under the supporting action. At this time, the limiting column 108 enters the limiting groove 116 for clamping, so that the two drill rods cannot rotate relative to each other, thereby improving the connection effect when the two drill rods are connected. Then, the fixing plate 111 is installed on the connecting head 102, so that the supporting portion 113 supports the mounting ring 106, thereby fixing the position of the mounting ring 106, so that one end of the limiting column 108 is always in the limiting groove 116, so as to improve the connection effect.

[0040] The above disclosure is merely one or more preferred embodiments of the present application and is not intended to limit the scope of the present application. A person skilled in the art will understand that all or part of the processes of the above embodiments and equivalent changes made in accordance with the claims of the present application are still within the scope of the present application.

Claims

1. A small-diameter steel pipe drill pipe used in ultra-deep well conditions, characterized by: The invention comprises a drill string, a connector, a connector seat and a limit assembly, wherein the connector is fixedly connected to one end of the drill string, the connector seat is fixedly connected to the drill string, the connector seat is located at the end of the drill string away from the connector, the connector is provided with a threaded column, and the connector seat has a threaded hole adapted to the threaded column; The limiting assembly includes a mounting ring, a first spring and a plurality of limiting posts, the connecting head having a connecting cavity and a connecting cavity in communication, the two ends of the first spring being fixedly connected to the mounting ring and the connecting head respectively, the first spring being located inside the mounting cavity, the mounting ring being slidably connected to the connecting head, the mounting ring being located inside the mounting cavity, the plurality of limiting posts being fixedly connected to the mounting ring respectively and passing through the interior of the limiting cavity, the plurality of limiting posts being arranged around the circumference of the threaded post, and the connecting seat having a limiting groove adapted to the limiting post; The limiting assembly further includes a fixing plate, the fixing plate is fixedly connected to the connector, and the fixing plate is located on a side of the installation cavity; The fixing plate includes a shielding portion and a supporting portion, the supporting portion is block-shaped, the supporting portion is fixedly connected to the shielding portion, the supporting portion is located on the side of the shielding portion, and connecting portions are provided at both ends of the shielding portion, and the connecting portion and the shielding portion are integrally formed.

2. The small-diameter steel pipe drill pipe for ultra-deep well working conditions according to claim 1, characterized in that: The connecting portion is provided with a positioning piece, the connecting head has a positioning groove adapted to the positioning piece, and the positioning piece is located inside the positioning groove.

3. The small-diameter steel pipe drill pipe for ultra-deep well working conditions according to claim 2, characterized in that: The mounting ring has a receiving cavity, and a toggle structure is provided inside the receiving cavity. The toggle structure includes a second spring and a movable frame. The two ends of the second spring are fixedly connected to the mounting ring and the movable frame respectively, and the movable frame is slidably connected to the mounting ring.

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