Protective sleeve for antenna while drilling

Abstract

The utility model provides a protection sleeve for an antenna while drilling, and belongs to the field of oil and gas development and exploration. The antenna protection sleeve comprises a sleeve outer layer and a sleeve inner layer arranged in the sleeve outer layer, the inner wall of the sleeve outer layer is in attached contact with the outer wall of the sleeve inner layer, and strip filling holes are formed in the sleeve outer layer and the sleeve inner layer; and filling blocks are filled in the strip-shaped filling holes. The sleeve outer layer and the sleeve inner layer are adopted to form a double-layer protective sleeve structure, and the high-strength sleeve outer layer is in contact with drilling fluid, rock debris and a well wall to resist erosion and friction; the inner layer of the sleeve is in contact with the antenna and wraps the antenna; the long-strip-shaped filling holes in the sleeve outer layer and the sleeve inner layer are filled with the filling blocks, so that drilling cuttings are prevented from entering the antenna, and the antenna is prevented from being abraded.

Description

Technical Field

[0001] The utility model belongs to the field of oil and gas development and exploration, and in particular relates to a drilling antenna protection sleeve. Background Art

[0002] Drilling exploration is characterized by high investment and high risk. With the increasing depletion of oil and gas resources, the depth and complexity of the exploration and development formations are gradually increasing, and the investment and risk are also increasing. In order to reduce the risk of oil and gas drilling and development and save capital investment, instruments and tools such as logging while drilling (LWD), measurement while drilling (MWD) or near-bit measurement are often used in the drilling process to collect bottom hole formation parameters and transmit data to the ground, so that drilling engineers can understand the bottom hole formation and guide the geological guidance decision while drilling. The cross-screw transmission antenna of the near-bit measurement instrument is a key component of the instrument, which is responsible for transmitting data from the near-bit short section to the receiving short section. There are harsh working conditions such as high-speed rotation, drilling fluid and cuttings erosion, and rock wall friction near the drill bit. The antenna is mainly composed of cables and must be protected by highly reliable protection measures.

[0003] The common antenna protection structure consists of a slotted metal tube and an insulating filler strip, which is bonded to the metal tube with a high-strength adhesive. After operating for a period of time in the harsh working environment near the drill bit, the insulating filler strip often falls off, causing drilling fluid and rock cuttings to enter the antenna, causing the antenna to break and become ineffective. Utility Model Content

[0004] The purpose of the utility model is to solve the above-mentioned problems existing in the prior art and to provide a drilling antenna protection sleeve. When the protection sleeve is used for a drilling near-bit measuring instrument, the electrical performance of the instrument antenna is not affected, and when the downhole near-bit measuring instrument rotates at high speed, the internal antenna of the instrument is protected to prevent the antenna from being eroded by drilling fluid and rock cuttings and from rubbing against the rock wall.

[0005] The utility model is realized by the following technical solutions:

[0006] The utility model provides a drilling antenna protection sleeve, comprising a sleeve outer layer and a sleeve inner layer arranged inside the sleeve outer layer.

[0007] Long filling holes are provided on the outer layer of the sleeve and the inner layer of the sleeve;

[0008] The long strip filling hole is filled with a filling block.

[0009] The further improvement of the utility model is:

[0010] The outer layer of the sleeve comprises an outer layer body, one end of the outer layer body is provided with two first protrusions, and the two first protrusions are arranged opposite to each other;

[0011] A pin installation hole is arranged on the side wall at the other end of the outer layer body, and an anti-dropping clamping spring is arranged in the pin installation hole.

[0012] The further improvement of the utility model is:

[0013] The two first protrusions are arranged opposite to each other;

[0014] The first protrusion is formed by extending the end of the outer layer body outward along the axial direction.

[0015] The further improvement of the utility model is:

[0016] A plurality of first long strip filling holes are evenly arranged on the outer layer body along the circumferential direction, and each of the first long strip filling holes is arranged along the axial direction of the outer layer body.

[0017] The further improvement of the utility model is:

[0018] The outer layer of the sleeve is a non-magnetic alloy outer layer.

[0019] The further improvement of the utility model is:

[0020] The inner layer of the sleeve comprises an inner layer body, one end of the inner layer body is provided with two second protrusions, and the two second protrusions are arranged opposite to each other;

[0021] The position of the second protrusion corresponds to the position of the first protrusion.

[0022] The further improvement of the utility model is:

[0023] A plurality of second long strip filling holes are evenly arranged on the inner layer body along the circumferential direction, and each of the second long strip filling holes is arranged along the axial direction of the inner layer body.

[0024] The further improvement of the utility model is:

[0025] The arrangement position, quantity and size of the second long strip filling holes correspond one-to-one to those of the first long strip filling holes.

[0026] The further improvement of the utility model is:

[0027] The inner layer of the sleeve is a non-magnetic alloy inner layer.

[0028] The further improvement of the utility model is:

[0029] The filling block is inlaid and filled between the second long strip filling hole and the first long strip filling hole.

[0030] Compared with the prior art, the beneficial effects of the utility model are:

[0031] The utility model proposes a protective sleeve for a drilling antenna, which adopts a double-layer protective sleeve structure composed of a sleeve outer layer and a sleeve inner layer. The high-strength metal outer layer contacts drilling fluid, rock cuttings and well wall to resist erosion and friction; the sleeve inner layer contacts the antenna and wraps the antenna; the long filling holes on the sleeve outer layer and the sleeve inner layer are filled with filling blocks to prevent drilling rock cuttings from entering the antenna and causing wear of the antenna.

[0032] The utility model is used to protect the antenna of the drilling near-bit measuring instrument while drilling. The electrical performance of the instrument antenna is not affected by the sleeve. In addition, when the downhole near-bit measuring instrument rotates at a high speed, the internal antenna of the instrument is protected to prevent the antenna from being eroded by drilling fluid and rock cuttings and from rubbing against the rock wall, thereby preventing drilling cuttings from entering the antenna and causing wear of the antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the structure of the sleeve in the embodiment of the utility model;

[0034] Figure 2 is a schematic diagram of the structure of the metal outer layer;

[0035] Figure 3 It is a schematic diagram of the structure of the inner layer of the sleeve;

[0036] Figure 4 It is a structural diagram of the filling block;

[0037] Figure 5 This is a schematic diagram of the assembly of the antenna protection sleeve and the drill collar of the utility model;

[0038] Figure 6 Schematic diagram of the drill collar structure.

[0039] In the figure,

[0040] 1. Outer body;

[0041] 2. The first protrusion;

[0042] 3. Pin installation hole;

[0043] 4. The first strip fills the hole;

[0044] 5. Inner body;

[0045] 6. Second bulge;

[0046] 7. The second long strip fills the hole;

[0047] 8. Filling blocks;

[0048] 9. Drill collar;

[0049] 10. Keyway. DETAILED DESCRIPTION

[0050] The utility model is further described in detail below in conjunction with the accompanying drawings:

[0051] [Example 1]

[0052] like Figure 1 As shown, the embodiment of the utility model provides a drilling antenna protection sleeve, comprising a sleeve outer layer and a sleeve inner layer arranged inside the sleeve outer layer, wherein the inner wall of the sleeve outer layer is in close contact with the outer wall of the sleeve inner layer;

[0053] Long filling holes are provided on both the outer layer and the inner layer of the sleeve;

[0054] The long strip filling holes are filled with filling blocks.

[0055] The utility model adopts a double-layer protective sleeve structure composed of a sleeve outer layer and a sleeve inner layer. The high-strength sleeve outer layer contacts the drilling fluid, rock cuttings and the well wall to resist erosion and friction; the sleeve inner layer contacts the antenna and wraps the antenna; the long filling holes on the sleeve outer layer and the sleeve inner layer are filled with filling blocks to prevent drilling rock cuttings from entering the antenna and causing wear of the antenna.

[0056] [Example 2]

[0057] like Figure 2 As shown, the outer layer of the sleeve includes an outer body 1, and one end of the outer body 1 is provided with two first protrusions 2, which are arranged opposite to each other. The first protrusions 2 are formed by the end of the outer body 1 extending outward along the axial direction. When the sleeve is sleeved on the drill collar, it is matched with the keyway on the drill collar to fix the sleeve and prevent the sleeve from rotating; a pin mounting hole 3 is provided on the side wall of the other end of the outer body 1, and an anti-drop spring is provided in the pin mounting hole 3 to prevent the pin from falling off. The length of the inner layer of the sleeve is less than the length of the outer layer of the sleeve. When the antenna protection sleeve is sleeved on the drill collar, the pin is successively passed through the pin mounting hole 3 on the outer body and the corresponding pin hole on the drill collar to fix it to prevent the sleeve from rotating.

[0058] A plurality of first long strip filling holes 4 are evenly arranged along the circumferential direction on the outer layer body 1 . Each first long strip filling hole 4 is arranged along the axial direction of the outer layer body 1 and is used to fill the filling block 8 .

[0059] Preferably, the outer layer of the sleeve is a non-magnetic alloy outer layer.

[0060] [Example 3]

[0061] like Figure 3As shown, the inner layer of the sleeve includes an inner layer body 5, and two second protrusions 6 are provided at one end of the inner layer body 5. The two second protrusions 6 are arranged opposite to each other, and the positions of the second protrusions 6 correspond to the positions of the first protrusions 2. The second protrusions 6 are formed by extending axially outward from the end of the inner layer body 5. When the sleeve is sleeved on the drill collar, it cooperates with the keyway on the drill collar to fix the sleeve and prevent the sleeve from rotating.

[0062] A plurality of second long filling holes 7 are evenly arranged along the circumferential direction on the inner layer body 5 . Each second long filling hole 7 is arranged along the axial direction of the inner layer body and is used to fill the filling block 8 .

[0063] The setting position, quantity and size of the second long strip filling holes 7 correspond one to one with those of the first long strip filling holes 4 .

[0064] The end surface of one end of the inner layer of the sleeve provided with the second protrusion is flush with the end surface of one end of the outer layer of the sleeve provided with the first protrusion, that is, they are on the same plane.

[0065] Preferably, the inner layer of the sleeve is a non-magnetic alloy inner layer.

[0066] [Example 4]

[0067] like Figure 4 As shown, the filling block is a non-8 metal filling block, and its cross-section is a hexagonal structure. The filling block 8 is inlaid and filled in the first long strip filling hole 4 and the second long strip filling hole 7. Specifically, the upper end face of the filling block 8 is filled in the first long strip filling hole 4, and the lower end is not filled in the second long strip filling hole 7 to prevent the filling block 8 from falling off and squeezing the antenna.

[0068] The filling block 8 is tightly matched with the groove wall of the first long strip filling hole 4 and the second long strip filling hole 7 .

[0069] A plurality of filling blocks 8 are provided, and the number of the filling blocks 8 is the same as the number of the first long strip filling holes 4 and the second long strip filling holes 7 .

[0070] The outer layer of the sleeve and the filling block 8 form an anti-wear protection structure.

[0071] [Example 5]

[0072] like Figure 5 As shown, the antenna protection sleeve of the utility model is sleeved on the drill collar 9, the two are tightly matched, and are fixed by a pin to prevent the sleeve from rotating. The inner diameter of the antenna protection sleeve is adapted to the outer wall size of the drill collar.

[0073] like Figure 6 As shown, two key grooves 10 are provided on the outer wall of the drill collar 9, and the two key grooves 9 are arranged opposite to each other. The positions of the two key grooves 9 correspond to the position lines of the first protrusion 2 and the second protrusion 6. The first protrusion 2 and the second protrusion 6 are fitted and inserted into the key groove 10 to fix the antenna protection sleeve and prevent the antenna protection sleeve from rotating.

[0074] O-rings are installed on the drill collar 9 and at both ends of the antenna protection sleeve, so that the sleeve is centered on the drill collar body, reducing friction between the antenna protection sleeve and the drill collar, and preventing rock cuttings from entering the antenna and causing wear of the antenna.

[0075] The utility model is used to protect the antenna of the drilling near-bit measuring instrument while drilling. The electrical performance of the instrument antenna is not affected by the sleeve. In addition, when the downhole near-bit measuring instrument rotates at a high speed, the internal antenna of the instrument is protected to prevent the antenna from being eroded by drilling fluid and rock cuttings and from rubbing against the rock wall, thereby preventing drilling cuttings from entering the antenna and causing wear of the antenna.

[0076] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0077] In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0078] The above technical solution is only one implementation method of the utility model. For those skilled in the art, it is easy to make various types of improvements or modifications based on the principles disclosed in the utility model, and it is not limited to the technical solution described in the above specific embodiments of the utility model. Therefore, the above description is only preferred and does not have a restrictive meaning.

Claims

1. A drilling antenna protection sleeve, characterized in that: It comprises a sleeve outer layer and a sleeve inner layer arranged in the sleeve outer layer, The outer layer of the sleeve and the inner layer of the sleeve are provided with long strip filling holes, and the long strip filling holes are filled with filling blocks; The outer layer of the sleeve comprises an outer layer body, and one end of the outer layer body is provided with two first protrusions; A pin installation hole is arranged on the side wall at the other end of the outer layer body, and an anti-dropping clamping spring is arranged in the pin installation hole.

2. The drilling antenna protection sleeve according to claim 1, characterized in that: The two first protrusions are arranged opposite to each other; The first protrusion is formed by extending the end of the outer layer body outward along the axial direction.

3. The drilling antenna protection sleeve according to claim 1, characterized in that: A plurality of first long strip filling holes are evenly arranged on the outer layer body along the circumferential direction, and each of the first long strip filling holes is arranged along the axial direction of the outer layer body.

4. The drilling antenna protection sleeve according to claim 1, characterized in that: The outer layer of the sleeve is a non-magnetic alloy outer layer.

5. The drilling antenna protection sleeve according to claim 3, characterized in that: The inner layer of the sleeve comprises an inner layer body, one end of the inner layer body is provided with two second protrusions, and the two second protrusions are arranged opposite to each other; The position of the second protrusion corresponds to the position of the first protrusion.

6. The drilling antenna protection sleeve according to claim 5, characterized in that: A plurality of second long strip filling holes are evenly arranged on the inner layer body along the circumferential direction, and each of the second long strip filling holes is arranged along the axial direction of the inner layer body.

7. The drilling antenna protection sleeve according to claim 6, characterized in that: The arrangement position, quantity and size of the second long strip filling holes correspond one to one with those of the first long strip filling holes.

8. The drilling antenna protection sleeve according to claim 5, characterized in that: The inner layer of the sleeve is a non-magnetic alloy inner layer.

9. The drilling antenna protection sleeve according to claim 7, characterized in that: The filling block is inlaid and filled between the second long strip filling hole and the first long strip filling hole.

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