Metal centralizer used on MWD instrument

Abstract

The utility model discloses a metal centralizer used on an MWD (Measurement While Drilling) instrument, the metal centralizer is arranged on a body of each section of tool string, and comprises a metal elastic block, the bottom surface of the elastic block body is provided with a spring hole capable of placing a spring, and the edge of the bottom of the elastic block body is provided with a circle of convex structure; an elastic block through hole for containing the metal elastic block is formed in the middle of the metal centralizing base, and threaded through holes are formed in the two ends of the metal centralizing base. According to the metal centralizer, electricity conduction can be achieved when the metal centralizer works underground, the signal transmission efficiency is improved, the metal centralizer is more resistant to scouring in slurry, and the service life is prolonged; the metal centralizers are concentrated on the body of each section of tool string, so that the length of the tool string can be reduced, the probability of underground accidents can be reduced, the weight of the tool string can be reduced, and the tool string is easy to hoist on site; the mounting and the dismounting are very simple and convenient; and wide applicability to the inner diameter of the drilling tool is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to petroleum drilling instrument mechanical technology field, especially a kind of metal centralizer used on MWD instrument. BACKGROUND

[0002] The main function of the centralizer is to ensure that the MWD (Measurement While Drilling) instrument maintains the correct position and posture in the wellbore, preventing it from deviating or rotating due to various forces during drilling, thereby ensuring the accuracy and reliability of the measurement data. In addition, the centralizer can also provide certain shock absorption and stability for the MWD instrument, reducing the impact of vibration and impact on the instrument during drilling, and prolonging the service life of the instrument.

[0003] The centralizer used on the MWD tool string in the industry is generally a rubber centralizer, with 3 wings, 4 wings or 5 wings, mainly to center the instrument in the non-magnetic drilling tool. The industry also uses a spring leaf centralizer, which can conduct electricity.

[0004] The present inventors have found at least the following technical problems in the prior art during the use of existing centralizers:

[0005] The rubber centralizer has the following disadvantages: (1) The rubber wing is easily eroded, has a short service life, and needs to be replaced frequently. However, due to the design structure, it also requires time and effort to replace it, which is very inconvenient. (2) The outer diameter size of the rubber wing is fixed once it is put into the well, and it is not adjustable. (3) The rubber wing is insulating and cannot conduct electricity, but when the MWD instrument is used near the drill bit, the centralizer block needs to be in contact with the inner wall of the drilling tool to form a closed loop.

[0006] The spring leaf of the spring leaf centralizer has a certain expansion space, and the outer diameter size is adjustable. However, the spring leaf is too thin and easily eroded and broken, and it is time-consuming and laborious to replace the spring leaf on site.

[0007] In summary, the existing centralizer cannot meet the actual use requirements. UTILITY MODEL CONTENT

[0008] The utility model embodiment provides a kind of metal centralizer used on MWD instrument, solve the problem that the existing centralizer cannot meet the actual use requirement.

[0009] The utility model embodiment provides a kind of metal centralizer used on MWD instrument, the metal centralizer is installed on the body of each section tool string, and it includes:

[0010] The metal spring block is provided with a spring hole for placing a spring at the bottom surface of the spring block body, and a protruding structure is arranged at the bottom edge position of the spring block body;

[0011] The metal centralizer base is provided with a spring block through hole for accommodating the metal spring block, and is provided with threaded through holes at both ends;

[0012] When the metal centralizer is assembled on the MWD instrument, the spring is placed in the spring hole of each tool string on the MWD instrument, the spring is aligned with the spring hole of the metal spring block, then the metal spring block is placed on the spring, the metal centralizer base is sleeved on the metal spring block, the protruding structure of the metal spring block is abutted against the edge of the spring block through hole of the metal centralizer base by the elastic force of the spring, finally, the screw is screwed through the threaded through holes of the metal centralizer base and the threaded holes on the tool string to fix the metal centralizer on the MWD instrument.

[0013] Optionally, the metal spring block is a non-magnetic metal spring block, and the metal centralizer base is a non-magnetic metal centralizer base.

[0014] Optionally, the non-magnetic metal spring block is a beryllium copper spring block or a TC18 titanium material spring block, and the non-magnetic metal centralizer base is a beryllium copper centralizer base or a TC18 titanium material centralizer base.

[0015] Optionally, the number of spring holes is one or more than one.

[0016] Optionally, the number of spring holes is two.

[0017] Optionally, the number of threaded through holes is two or more than two.

[0018] Optionally, the number of threaded through holes is two.

[0019] Optionally, the metal centralizer base further comprises a stabilizing block arranged at both ends of the metal centralizer base.

[0020] Optionally, the metal centralizer base further comprises a positioning hole in communication with the spring block through hole, and the metal spring block further comprises a positioning protrusion arranged at the protruding structure, and the positioning protrusion is clamped in the positioning hole when the metal centralizer base is sleeved on the metal spring block.

[0021] The one or more technical solutions provided in the embodiments of the utility model have at least the following technical effects or advantages:

[0022] The metal centralizer and the metal centralizer base of the utility model are used to replace the original rubber centralizer and spring piece centralizer, which can realize electric conduction when working in the well, improve the efficiency of signal transmission, and can be more resistant to scour in mud liquid and prolong the service life; the traditional centralizer is installed at the top or bottom of the previous string, which increases the length of the previous string, while the metal centralizer of the utility model is concentrated on the body of each section of tool string, which can reduce the length of the tool string, reduce the probability of downhole accidents, and also make the weight of the tool string lighter and easy to hoist on site; whether it is a rubber centralizer or a spring piece centralizer, the on-site disassembly and installation process requires a large number of steps, and many auxiliary tools are also needed, which is not only complicated but also time-consuming, while the metal centralizer of the utility model is very simple to install and disassemble, and only needs to use a screwdriver to tighten the screw to realize installation, and only needs to use a screwdriver to disassemble the screw to realize disassembly; the metal centralizer of the utility model has wide applicability to the inner diameter of the drilling tool, and the metal elastic block can be supported and contacted with the drilling tool with an inner diameter of 72mm-90mm through the spring, without the need to replace spring blocks of different sizes. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a first assembly drawing of the metal centralizer used on the MWD instrument in an embodiment of the utility model;

[0024] Figure 2 It is a second assembly drawing of the metal centralizer used on the MWD instrument in an embodiment of the utility model;

[0025] Figure 3 It is a metal elastic block structure drawing of the metal centralizer used on the MWD instrument in an embodiment of the utility model;

[0026] Figure 4 It is a metal centralizer base structure drawing of the metal centralizer used on the MWD instrument in an embodiment of the utility model;

[0027] In the drawing: 10-metal elastic block; 11-elastic block body; 12-protruding structure; 13-spring hole; 14-positioning protrusion; 20-metal centralizer base; 21-elastic block through hole; 22-positioning hole; 23-threaded through hole; 24-stabilizing block. DETAILED DESCRIPTION

[0028] The metal centralizer used on the MWD instrument provided by the embodiment of the utility model solves the problem that the existing centralizer cannot meet the actual use requirement.

[0029] In order to better understand the metal centralizer used on the MWD instrument, the following will be described in detail in combination with the drawings and specific embodiments. Obviously, the embodiments described in the utility model are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0030] Please refer to the following Figures 1-4 , a metal centralizer used on a MWD instrument is described in detail.

[0031] The metal centralizer used on the MWD instrument of the utility model is installed on the body of each tool string, and the metal centralizer comprises a metal elastic block 10 and a metal centralizer base 20.

[0032] The metal elastic block 10 comprises an elastic block body 11, a spring hole 13 and a protruding structure 12. The spring hole 13 for placing the spring is arranged on the bottom surface of the elastic block body 11, and a circle of protruding structures 12 is arranged at the bottom edge position of the elastic block body 11.

[0033] In order to avoid magnetic field interference, the metal elastic block 10 is specifically a non-magnetic metal elastic block. Preferably, the non-magnetic metal elastic block is specifically a beryllium copper elastic block or a TC18 titanium material elastic block. In actual application, the non-magnetic metal elastic block can select an elastic block of other materials, and the utility model is not limited.

[0034] In order to set different numbers of springs according to actual needs, improve the application range, correspondingly, the number of spring holes 13 is one or more than one. Preferably, the number of spring holes 13 is two, which can better support the metal elastic block.

[0035] The metal centralizer base 20 comprises an elastic block through hole 21 and a threaded through hole 23. The elastic block through hole 21 for accommodating the metal elastic block 10 is arranged in the middle of the metal centralizer base, and the threaded through hole 23 is arranged at both ends of the metal centralizer base.

[0036] In order to avoid magnetic field interference, the metal centralizer base 20 is specifically a non-magnetic metal centralizer base. Preferably, the non-magnetic metal centralizer base is specifically a beryllium copper centralizer base or a TC18 titanium material centralizer base. In actual application, the non-magnetic metal centralizer base can select a centralizer base of other materials, and the utility model is not limited.

[0037] In order to set different fixed points according to actual needs, the number of threaded through holes 23 is one or more than one. Preferably, the number of threaded through holes 23 is two, which can better fix the metal centralizer on the MWD instrument.

[0038] In order to expand the contact area of the base and the instrument, improve the stability, the metal centralizer base also includes stabilizing blocks 24, stabilizing blocks 24 are arranged at both ends of the metal centralizer base 20.

[0039] Assembly process:

[0040] When the metal centralizer is assembled in the MWD instrument, first, the spring is placed in the spring hole of each tool string on the MWD instrument, and the spring is aligned with the spring hole 13 of the metal spring block 10, then the metal spring block 10 is placed on the spring, the metal centralizer base 20 is sleeved on the metal spring block 10, and the elastic force of the spring abuts the protruding structure 12 of the metal spring block 10 against the edge of the spring block through hole 21 of the metal centralizer base 20, and finally the screw is passed through the threaded through hole 23 of the metal centralizer base 20 and the threaded hole on the tool string to fix the metal centralizer on the MWD instrument.

[0041] In order to facilitate the alignment of the assembly process of the metal spring block 10 and the metal centralizer base 20, and improve the stability between the metal spring block 10 and the metal centralizer base 20, the metal centralizer base 20 also includes a positioning hole 22, which communicates with the spring block through hole 21; the metal spring block also includes a positioning protrusion 14, which is arranged on the protruding structure 12; when the metal centralizer base 20 is sleeved on the metal spring block 10, the positioning protrusion 14 is clamped in the positioning hole 22.

[0042] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application also intends to include these modifications and variations.

Claims

1. A metal centralizer for use on MWD instruments, characterized in that, The metal centralizer is mounted on the body of each section of the tool string, comprising: a metal spring block (10), the bottom surface of the spring block body (11) is provided with a spring hole (13) for placing a spring, and a ring of protruding structures (12) is arranged at the bottom edge of the spring block body (11); a metal centralizing base (20), the middle part of which is provided with a spring block through hole (21) for accommodating the metal spring block (10), and the two ends of the metal centralizing base (20) are provided with threaded through holes (23); the metal centralizing base (20) further comprises: stabilizing blocks (24) arranged at the two ends of the metal centralizing base (20); when the metal centralizer is assembled on the MWD instrument, first, a spring is placed in the spring hole of each section of the tool string on the MWD instrument, and the spring is aligned with the spring hole (13) of the metal spring block (10), then the metal spring block (10) is placed on the spring, the metal centralizing base (20) is sleeved on the metal spring block (10), and at the same time, the elastic force of the spring abuts the protruding structure (12) of the metal spring block (10) against the edge of the spring block through hole (21) of the metal centralizing base (20), finally, the screws are screwed through the threaded through holes (23) of the metal centralizing base (20) and the threaded holes on the tool string to fix the metal centralizer on the MWD instrument; the metal centralizing base (20) further comprises: a positioning hole (22) in communication with the spring block through hole (21); the metal spring block (10) further comprises: a positioning protrusion (14) arranged on the protruding structure (12); when the metal centralizing base (20) is sleeved on the metal spring block (10), the positioning protrusion (14) is clamped in the positioning hole (22), so as to facilitate the alignment of the assembly process of the metal spring block (10) and the metal centralizing base (20) and improve the stability between the metal spring block (10) and the metal centralizing base (20); the metal centralizer is easy to assemble and disassemble, and only needs to be screwed with a screwdriver to realize installation, and only needs to be disassembled with a screwdriver to realize disassembly; the metal centralizer is used to support the metal spring block (10) out by the spring and contact the drill tool with an inner diameter of 72mm-90mm, so as to adapt to drill tools with different inner diameters.

2. The metal centralizer of claim 1, wherein, The metal spring block (10) is a non-magnetic metal spring block, and the metal centralizing base (20) is a non-magnetic metal centralizing base.

3. The metal centralizer of claim 2, wherein, The non-magnetic metal spring block is a beryllium copper spring block or a TC18 titanium material spring block, and the non-magnetic metal centralizing base is a beryllium copper centralizing base or a TC18 titanium material centralizing base.

4. The metal centralizer of claim 1, wherein, The number of the spring hole (13) is one or more than one.

5. The metal centralizer of claim 4, wherein, The number of the spring hole (13) is two.

6. The metal centralizer of claim 1, wherein, The number of the threaded through hole (23) is two or more than two.

7. The metal centralizer of claim 6, wherein, The number of the threaded through hole (23) is two.

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