Acoustic logging instrument leather bag protection device and acoustic logging instrument

Abstract

The utility model discloses an acoustic logging instrument leather bag protection device and an acoustic logging instrument. A transducer notch groove shell is arranged outside a leather bag in a sleeving mode. A window is formed in the transducer notch groove shell, and a leather bag protection sheet is mounted on the window of the transducer notch groove shell in an embedded manner; a through hole is formed in the leather bag protection sheet; the inner diameter of the face, facing the transducer, of the leather bag protection piece is equal to that of the transducer notch groove shell, and the outer diameter of the face, back to the transducer, of the leather bag protection piece is smaller than that of the transducer notch groove shell. According to the utility model, the exposed part of the leather bag can be locally protected, so that the outer diameter of the instrument is prevented from being increased due to overall protection, and the probability that the instrument is blocked or blocked is reduced; the through holes in the leather bag protection piece can prevent large foreign matter from making direct contact with the leather bag, the leather bag is prevented from being scratched, meanwhile, sound waves can pass through the through holes, the correctness of logging information can be guaranteed after the window protection piece is installed, and signal transmitting and receiving of an instrument cannot be affected.

Description

Technical Field

[0001] The utility model belongs to the technical field of petroleum logging, and specifically relates to a bladder protection device for an acoustic logging instrument and an acoustic logging instrument. Background Art

[0002] In order to better transmit and receive sound energy, the acoustic system housing needs to have windows at the transmitting and receiving transducer positions, and the transducer needs to be wrapped with a bladder and filled with oil. The wrapped bladder is made of rubber, and the acoustic system sound-transmitting window is large. During the logging process, the well wall rubs against the instrument, and it is easy to be scratched by foreign objects or rocks in the well through the window. Especially in high-angle wells, it is easier for the bladder to be scratched by rocks or foreign objects, causing damage to the equipment and logging failure.

[0003] In order to reduce the occurrence of this phenomenon, it is necessary to provide a bladder protection device to protect the bladder without affecting the accuracy of the logging data.

[0004] The existing protection schemes can be basically divided into two types. One is to use a jacket-type protective tube for the acoustic system of the dipole acoustic logging instrument, that is, to protect the entire acoustic system. The outer diameter of the direct-push dipole acoustic logging instrument is about Φ100mm. After installing the protective tube, the outer diameter of the instrument can reach Φ120mm. Although it protects the bladder, it increases the outer diameter of the instrument. In actual applications, the large outer diameter of the instrument is prone to obstruction or jamming problems downhole, increasing the probability of downhole engineering accidents during the logging process of the instrument. The other is to protect each window of the acoustic system shell of the dipole acoustic logging instrument with a separate bladder protection sheet, and use elastic retaining springs to clamp each bladder protection sheet at the window. This can protect the bladder without increasing the outer diameter of the instrument. However, the installation method of the bladder protection sheet causes the bladder protection sheet to touch foreign objects or rocks in the well during the downhole logging process of the instrument, which is easy to compress the bladder and transducer, causing the elastic retaining spring to fall off, making the protection ineffective.

[0005] The patent application with the publication number CN210598958U and the name of the patent application is a kind of acoustic logging instrument housing protective cover, which discloses an acoustic logging instrument housing protective cover, including a housing frame, the housing frame is provided with a plurality of mounting holes in the circumference, each of the mounting holes is provided with a screw sleeve, each of the screw sleeve is provided with a fastening screw, and when the fastening screw is screwed into the corresponding screw sleeve, the insertion end of the fastening screw is against the outer side of the sonar logging instrument housing. Although this patent application can provide protection, it increases the outer diameter of the instrument. In actual application, the large outer diameter of the instrument is prone to obstruction or jamming problems downhole. Utility Model Content

[0006] In order to overcome the problems existing in the above-mentioned prior art, the purpose of the utility model is to provide a sonic logging instrument bladder protection device and a sonic logging instrument. By inserting and installing the bladder protection sheet, the sonic logging instrument bladder can be protected without increasing the outer diameter of the instrument, and at the same time, the elastic retaining spring can be effectively prevented from falling off under force in the well.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0008] A bladder protection device for an acoustic logging instrument comprises: a transducer grooved shell, the transducer grooved shell is sleeved outside a bladder; a window is provided on the transducer grooved shell, a bladder protection sheet is embedded and installed on the window of the transducer grooved shell; a through hole is provided on the bladder protection sheet; a side of the bladder protection sheet facing the transducer is equal to the inner diameter of the transducer grooved shell, and a side of the bladder protection sheet facing away from the transducer is smaller than the outer diameter of the transducer grooved shell.

[0009] Optionally, a step is provided on the hole wall of the window, and the edge of the leather bag protection sheet has a protrusion that matches the step.

[0010] Optionally, the outer protrusion of the bladder protection sheet is a cylinder with an arc-shaped edge.

[0011] Optionally, the bladder protection sheet is a quadrilateral, and the number of the bladder protection sheet is four, and the bladder protection sheet is respectively arranged at the midpoints of the four sides of the bladder protection sheet.

[0012] Optionally, the outer protrusion of the bladder protection sheet is welded to the step of the window.

[0013] Optionally, the through hole of the bladder protection sheet is a rounded rectangle or an ellipse.

[0014] Optionally, the number of through holes in the leather bag protection sheet is greater than one, and they are evenly distributed along the radial direction of the grooved shell of the transducer.

[0015] Optionally, a plurality of first through holes are arranged on the leather bag protection sheet along the radial direction of the transducer grooved housing, and two second through holes symmetrically arranged along the central axis of the leather bag protection sheet are provided between two adjacent first through holes.

[0016] Optionally, the transducer grooved housing and the bladder protection sheet are both made of 17-4Ph stainless steel.

[0017] A sonic well logging instrument comprises the sonic well logging instrument bladder protection device.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The utility model installs a bladder protection sheet in a window of a grooved shell of a transducer, which can locally protect the exposed part of the bladder, avoid the increase of the outer diameter of the instrument caused by the overall protection, and reduce the probability of the instrument encountering obstruction or jamming; the through hole on the bladder protection sheet can isolate larger foreign matter from direct contact with the bladder, prevent the bladder from being scratched, and at the same time allow sound waves to pass through. After the window protection sheet is installed, the accuracy of the logging information can be guaranteed, and the transmission and reception signals of the instrument will not be affected.

[0020] Furthermore, since the bladder protection sheet is welded and fixed to the transducer groove, it is possible to avoid the possibility that the bladder protection sheet presses the bladder and the transducer or falls off during the downhole logging process of the instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are for explanation purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. In the drawings:

[0022] Figure 1 This is a schematic diagram of the cross-sectional structure of the utility model;

[0023] Figure 2 It is a side view of the utility model;

[0024] Figure 3 This is the front view of the utility model;

[0025] Among them, 1. transducer grooved shell; 2. leather bag; 3. leather bag protection sheet; 4. window; 5. convex; 6. transducer. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0027] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0029] The utility model is described in detail below in conjunction with the accompanying drawings.

[0030] like Figure 1 As shown, a bladder protection device for an acoustic well logging instrument of the utility model comprises a transducer grooved housing 1 , wherein the transducer grooved housing 1 is sleeved outside a bladder 2 of a transducer 6 .

[0031] The transducer grooved housing 1 is provided with a plurality of windows 4, and the windows 4 are equidistantly distributed along the circumferential direction of the transducer grooved housing 1. Specifically, the transducer grooved housing 1 is a hollow cylinder, and the transducer grooved housing 1 is provided with a plurality of circumferential window groups along its axial direction, and each circumferential window group includes four windows 4 equidistantly distributed along the circumferential direction of the transducer grooved housing 1.

[0032] The window 4 is fitted with a leather bag protection sheet 3, which is provided with a plurality of through holes equidistantly distributed along the radial direction of the transducer grooved housing 1. Optionally, the through holes of the leather bag protection sheet 3 are rounded rectangular or elliptical.

[0033] The shape of the bladder protection sheet 3 matches that of the window 4. The bladder protection sheet 3 is a curved quadrilateral, the top of the hole wall of each side of the window 4 is provided with a step, and the edge of each side of the bladder protection sheet 3 has a protrusion 5 matched with the step.

[0034] The side of the leather bag protection sheet 3 facing the transducer 6 is an inner arc surface, and the side of the leather bag protection sheet 3 facing away from the transducer 6 is an outer arc surface. The side of the leather bag protection sheet 3 facing the transducer 6 is equal to the inner diameter of the transducer grooved housing 1, and the side of the leather bag protection sheet 3 facing away from the transducer 6 is smaller than the outer diameter of the transducer grooved housing 1. The leather bag protection sheet 3 avoids the increase of the outer diameter of the instrument caused by the overall protection, and reduces the probability of the instrument encountering obstruction or jamming.

[0035] The outer arc surface of the leather bag protection sheet 3 is located below the surface of the transducer grooved housing, ensuring that the window 4 of the leather bag protection sheet will not be exposed outside the transducer grooved housing after installation.

[0036] Specifically, the outer protrusion 5 of the bladder protection sheet 3 is a column with an arc-shaped edge.

[0037] Optionally, the four protrusions 5 of the bladder protection sheet 3 are respectively arranged at the midpoints of the four sides of the bladder protection sheet 3 .

[0038] The protrusion 5 of the bladder protection sheet 3 and the step of the window 4 are connected by welding.

[0039] The skin bag protection sheet 3 is provided with a plurality of first through holes along the radial direction of the transducer grooved housing 1, and two second through holes are provided between two adjacent first through holes and are symmetrically arranged along the central axis of the skin bag protection sheet 3. The length of the skin bag protection sheet 3 perpendicular to the long axis direction of the skin bag protection sheet 3 is the width of the skin bag protection sheet 3; the long axis length of the first through hole is greater than half of the width of the skin bag protection sheet 3, and the long axis length of the second through hole is less than half of the width of the skin bag protection sheet 3. By providing through holes of different lengths, the compressive strength of the skin bag protection sheet 3 can be increased.

[0040] Optionally, the transducer grooved housing 1 and the bladder protection sheet 3 are both made of 17-4Ph stainless steel.

[0041] Example

[0042] Combine the following Figure 1 The specific implementation methods of the utility model are further described.

[0043] The utility model provides a bladder protection device for an acoustic well logging instrument. When installing, firstly, the bladder protection sheet 3 is installed on the window 4 of the transducer groove housing 1. Then, the outer protrusion 5 of the bladder protection sheet 3 and the step of the window 4 are welded by an electric welder.

[0044] Unless otherwise specified, the device elements involved in the above embodiments are all conventional device elements, and the structural settings, working modes or control modes involved are all conventional settings, working modes or control modes in the art unless otherwise specified.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the utility model by ordinary technicians in this field should be included in the scope of the claims of the utility model as long as they do not depart from the spirit and scope of the technical solution of the utility model.

Claims

1. A bladder protection device for an acoustic logging instrument, characterized in that: include: A transducer grooved housing (1), wherein the transducer grooved housing (1) is sleeved outside a leather bag (2); a window (4) is provided on the transducer grooved housing (1), and a leather bag protection sheet (3) is mounted on the window (4) of the transducer grooved housing (1); a through hole is provided on the leather bag protection sheet (3); a side of the leather bag protection sheet (3) facing the transducer (6) is equal to the inner diameter of the transducer grooved housing (1), and a side of the leather bag protection sheet (3) facing away from the transducer (6) is smaller than the outer diameter of the transducer grooved housing (1).

2. The bladder protection device for an acoustic logging instrument according to claim 1, characterized in that: A step is provided on the hole wall of the window (4), and the edge of the bladder protection sheet (3) has an outer protrusion (5) that matches the step.

3. The bladder protection device for an acoustic logging instrument according to claim 2, characterized in that: The outer protrusion (5) of the bladder protection sheet (3) is a column with an arc-shaped edge.

4. The bladder protection device for an acoustic logging instrument according to claim 2, characterized in that: The bladder protection sheet (3) is a quadrilateral, and the number of the external protrusions (5) of the bladder protection sheet (3) is four, and they are respectively arranged at the midpoints of the four sides of the bladder protection sheet (3).

5. The bladder protection device for an acoustic logging instrument according to claim 2, characterized in that: The outer protrusion (5) of the bladder protection sheet (3) and the step of the window (4) are welded.

6. The bladder protection device for an acoustic logging instrument according to claim 1, characterized in that: The through hole of the bladder protection sheet (3) is in the shape of a rounded rectangle or an ellipse.

7. The bladder protection device for an acoustic logging instrument according to claim 1, characterized in that: The number of through holes of the leather bag protection sheet (3) is greater than one, and the through holes are evenly distributed along the radial direction of the transducer grooved housing (1).

8. The bladder protection device for an acoustic logging tool according to claim 7, characterized in that: The skin bag protection sheet (3) is provided with a plurality of first through holes along the radial direction of the transducer grooved housing (1), and two second through holes symmetrically arranged along the central axis of the skin bag protection sheet (3) are provided between two adjacent first through holes.

9. The bladder protection device for an acoustic logging tool according to claim 1, characterized in that: The transducer grooved housing (1) and the bladder protection sheet (3) are both made of 17-4Ph stainless steel.

10. An acoustic logging tool, characterized in that: The invention comprises a bladder protection device for an acoustic well logging instrument as described in any one of claims 1 to 9.

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