CN219425861U

CN219425861U - External thread blade for processing high-pressure fluid seal threads of geothermal well casing

Info

Publication number: CN219425861U
Application number: CN202320025725.0U
Authority: CN
Inventors: 李朝听
Original assignee: Shaanxi Yutuoneng Petroleum Special Pipe Co ltd
Current assignee: Shaanxi Yutuoneng Petroleum Special Pipe Co ltd
Priority date: 2023-01-03
Filing date: 2023-01-03
Publication date: 2023-07-28
Anticipated expiration: 2033-01-03

Abstract

The utility model discloses an external thread blade for processing high-pressure fluid seal threads of geothermal well casings, which comprises a blade body, wherein one side of the blade body is provided with a forming cutting tooth and an iron discharging cutting guide groove, the iron discharging cutting guide groove is arranged on the left side of the forming cutting tooth, a concave arc cutting surface is arranged at the connection position of the forming cutting tooth and the iron discharging cutting guide groove, and the forming cutting tooth consists of a guiding cutting surface, a tooth bottom arc cutting surface and a bearing cutting surface which are sequentially connected. The cutting stiffness of the blade is improved through the thickness control of the blade. The design of the length and the width ensures that the stress is uniform and the thread is not deformed in the thread cutting process, and the thread is smooth and continuous along the spiral line processing surface; the blade mounting and positioning holes are designed to ensure that the cutter body is stable and not rotated and not loosened in the cutting process of the cutter body, and the cutter body is fixed on the positioning groove of the cutter bar, so that the machining precision is high; the distance between the cutting tooth and the positioning side edge ensures that no iron cutting is accumulated after the thread is cut; meanwhile, the design of the row cutting guide groove effectively discharges the processed iron cutting, and avoids scratching the thread surface and damaging the blade.

Description

External thread blade for processing high-pressure fluid seal threads of geothermal well casing

Technical Field

The utility model relates to the technical field of thread blades, in particular to an external thread blade for processing high-pressure fluid seal threads of a geothermal well casing.

Background

The production sleeve threaded connection for the geothermal well adopts long round threads of the API SPEC 5B standard for the petroleum industry, has technical disclosure and maturity, and can be processed by manufacturers according to the standard with good interchangeability. But has obvious defects that the screw thread machined by adopting the existing cutter has larger screw channel clearance between the thread tooth top and the tooth bottom, and the channel is blocked by the screw thread grease, so that the sealing pressure is unstable in a high-temperature environment.

Disclosure of Invention

The utility model aims to solve the problem that a larger spiral channel gap exists between a thread top and a thread bottom of the thread machined by adopting the existing cutter. Aiming at the defects, a special thread which is not in API standard is developed, and the external thread adopts two sections of conicity, namely, two conicity are processed on 1 complete external thread length, so that the thread stretch resistance and high-pressure fluid tightness are realized; and meanwhile, the radius and the tooth height of the circular arcs of the tooth top and the tooth bottom are modified to be matched with the internal thread structure, and the leakage gap is blocked by means of the thickness of the phosphating coating of the internal thread of the coupling, so that the tightness is improved, and the heat exchange efficiency of the thread is improved. Aiming at the special thread processing of the production casing pipe non-API standard for the geothermal well with new design, a novel thread cutter is developed, and the two-section taper processing of the external thread of the special thread, namely the transition section of the taper change during the taper change processing, does not have the defects of discontinuous disconnection and tearing of the thread, cutter marks, grinding marks, shoulders and the like.

In order to solve the problems, the utility model provides an external thread blade for processing high-pressure fluid seal threads of geothermal well casings, which comprises a blade body, wherein one side of the blade body is provided with a forming cutting tooth and an iron discharging cutting guide groove, the iron discharging cutting guide groove is arranged on the left side of the forming cutting tooth, a concave arc cutting surface is arranged at the connection position of the forming cutting tooth and the iron discharging cutting guide groove, and the forming cutting tooth consists of a guiding cutting surface, a tooth bottom arc cutting surface and a bearing cutting surface which are sequentially connected.

Preferably, the thickness of the blade body is between 5 and 7mm, the length is between 15 and 16mm, the width is between 15 and 16mm, and the length-width ratio is 1: more than 1.

Preferably, a positioning center hole is formed in the middle of the blade body.

Preferably, the diameter of the positioning center hole is between 4 and 5mm, and the distance between the positioning center hole and the bottom edge of the blade body is between 4 and 6 mm; the distance between the positioning center hole and the side edge of the blade body is 8-10 mm.

Preferably, the angle of the iron-discharging cutting guide groove is 25-35 degrees.

Preferably, the distance between the forming cutting tooth and the side edge is between 13 and 15 mm.

Preferably, the angle of the cutting face angle of the shaped cutting flank is between 7 and 9 °.

Compared with the prior art, the utility model has the following beneficial effects due to the adoption of the technical scheme:

1. the 1-tooth cutting knife is adopted, so that the external thread taper-changing thread can be processed, the defects of discontinuous thread, tearing, tool mark, grinding mark, shoulder and the like of the thread at the taper-changing transition section are avoided, the smooth surface of the thread is ensured, and the purpose of repeatedly mounting and dismounting the thread without sticking is achieved.

2. The screw thread blade body is designed. The cutting stiffness of the blade is improved through the thickness control of the blade. The design of the length and the width ensures that the stress is uniform and the thread is not deformed in the thread cutting process, and the thread is smooth and continuous along the spiral line processing surface; the blade mounting and positioning holes are designed to ensure that the cutter body is stable and not rotated and not loosened in the cutting process of the cutter body, and the cutter body is fixed on the positioning groove of the cutter bar, so that the machining precision is high; the distance between the cutting tooth and the positioning side edge ensures that no iron cutting is accumulated after the thread is cut; meanwhile, the design of the row cutting guide groove effectively discharges the processed iron cutting, and avoids scratching the thread surface and damaging the blade.

Drawings

FIG. 1 is a schematic view of the overall structure of an externally threaded insert according to the present utility model;

FIG. 2 is a schematic view of an external thread insert cutting tooth according to the present utility model;

FIG. 3 is a schematic view of the front structure of an externally threaded insert according to the present utility model;

FIG. 4 is a schematic view of a special thread overall construction assembly;

in the figure: the blade comprises a blade body (6), forming cutting teeth (7), side edges (8), bottom edges (9), a positioning center hole (10), guiding cutting surfaces (11), tooth bottom arc cutting surfaces (13), bearing cutting surfaces (14), arc cutting surfaces (15), iron-discharging cutting guide grooves (16), cutting surface angles (17) and thicknesses (18).

Detailed Description

The technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present utility model are included in the protection scope of the present utility model. In the drawings, the size and relative sizes of certain parts may be exaggerated for clarity.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected" and "coupled" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; the terms may be used in any form, such as direct connection, indirect connection via an intermediate medium, communication between two elements or interaction between two elements, and the specific meaning of the terms in the present utility model will be understood by those skilled in the art.

Furthermore, in the description of the present utility model, the terms "first," "second," and "third" are used merely to distinguish between the descriptions.

As shown in fig. 1-4 of the specification, the utility model provides an external thread blade for processing high-pressure fluid seal threads of geothermal well casing, which comprises a blade body 6, wherein one side of the blade body 6 is provided with a forming cutting tooth 7 and an iron discharging cutting guide groove 16, the iron discharging cutting guide groove 16 is arranged on the left side of the forming cutting tooth 7, a concave arc cutting surface 15 is arranged at the connecting position of the forming cutting tooth 7 and the iron discharging cutting guide groove 16, and the forming cutting tooth 7 consists of a guiding cutting surface 11, a tooth bottom arc cutting surface 13 and a bearing cutting surface 14 which are sequentially connected.

Further, the thickness 18 of the blade body 6 is between 5 and 7mm, the length is between 15 and 16mm, the width is between 15 and 16mm, and the length-width ratio is 1: more than 1.

Further, a positioning center hole 10 is provided in the middle of the blade body 6.

Further, the diameter of the positioning center hole 10 is between 4 and 5mm, and the distance between the positioning center hole 10 and the bottom edge 9 of the blade body 6 is between 4 and 6 mm; the distance between the positioning center hole 10 and the side edge 8 of the blade body 6 is 8-10 mm.

Further, the angle of the iron-discharging guide groove 16 is 25 to 35 °.

Further, the distance between the formed cutting tooth 7 and the side edge 8 is between 13 and 15 mm.

Further, the angle of the cutting face angle 17 of the side face of the formed cutting tooth 7 is between 7 and 9 degrees.

Examples: the external thread blade is fixedly installed on a lathe cutter bar to be processed by threads through a positioning center hole 10, and the bottom edge 9 and the side edge 8 are tightly attached to a cutter bar blade installation positioning groove. During the processing of the blade, the formed cutting teeth 7 are finely turned into designed thread teeth. And in the machining process, the threads are cut along the small end taper 5, the variable taper transition section 4 and the large end taper 3 of the external threads, and the machined and cut iron skips pass through the iron skiving guide groove 16 to remove machined materials, so that the finish turning of the surfaces of the threads is ensured.

It will be appreciated by those skilled in the art that the utility model can be embodied in many other specific forms without departing from the spirit or scope of the utility model. Although an embodiment of the present utility model has been described, it is to be understood that the utility model is not limited to this embodiment, and that variations and modifications may be effected by one skilled in the art within the spirit and scope of the utility model as defined in the appended claims.

Claims

1. The utility model provides an external screw thread blade for geothermal well sleeve pipe high pressure fluid seal screw thread processing, its characterized in that, includes blade body (6), one side of blade body (6) sets up shaping cutting tooth (7), arranges iron and cuts guiding groove (16), arrange iron and cut guiding groove (16) and set up on the left side of shaping cutting tooth (7), shaping cutting tooth (7) are provided with sunken circular arc cutting face (15) with arranging iron and cut guiding groove (16) connected position, shaping cutting tooth (7) are by direction cutting face (11), tooth bottom circular arc cutting face (13), the bearing cutting face (14) that connect gradually and constitute.

2. The external thread blade for processing high-pressure fluid seal threads of geothermal well casing according to claim 1, wherein the thickness (18) of the blade body (6) is between 5 and 7mm, the length is between 15 and 16mm, the width is between 15 and 16mm, and the ratio of length to width is 1: more than 1.

3. An external screw thread insert for the high pressure fluid tight thread machining of geothermal well casing according to claim 2, characterized in that a locating center hole (10) is provided in the middle of the insert body (6).

4. An external screw thread insert for the high pressure fluid tight thread machining of geothermal well casing according to claim 3, characterized in that the diameter of the positioning central hole (10) is between 4 and 5mm, the distance of the positioning central hole (10) from the bottom edge (9) of the insert body (6) is between 4 and 6 mm; the distance between the positioning center hole (10) and the side edge (8) of the blade body (6) is 8-10 mm.

5. An external screw thread insert for hot well casing high pressure fluid tight thread machining according to claim 1, characterized in that the angle of the iron removing cutting guide groove (16) is 25-35 °.

6. An external screw thread insert for the high pressure fluid tight threading of geothermal well casing according to claim 1 characterized in that the distance of the shaped cutting teeth (7) from the side edge (8) is between 13 and 15 mm.

7. An external screw thread insert for the high pressure fluid tight thread machining of geothermal well casing according to claim 1, characterized in that the angle of the cutting face angle (17) of the side face of the shaped cutting tooth (7) is between 7 and 9 °.