Battery string structure for downhole wireless MWD

Abstract

The utility model belongs to the petroleum downhole instrument battery technical field, concretely relates to a downhole wireless while drilling surveying instrument battery string structure, including battery stick, connecting short circuit, shock absorber and first pressure -resisting cylinder, the end of connecting short circuit is equipped with second pressure -resisting cylinder, shock absorber sets up between connecting short circuit and battery stick, realizes both connections, first pressure -resisting cylinder is connected with the first end of connecting short circuit outside battery stick and shock absorber and is equipped.

Description

Technical Field

[0001] This utility model belongs to the field of downhole instrument battery technology, and more specifically, it relates to a battery string structure for a downhole wireless drilling survey instrument. Background Technology

[0002] MWD (Measurement While Drilling) is an advanced technology used in oil and gas drilling to acquire downhole parameters in real time. It allows operators to monitor critical information such as drill bit position, wellbore trajectory, and geological conditions while drilling, enabling timely adjustments to drilling parameters and direction to improve efficiency and accuracy. Specific instruments used for downhole measurement include: a probe for measuring parameters such as inclination, azimuth, tool face angle, and temperature; a pulse tube that encodes the information collected by the probe into electrical signals and generates pressure pulses by altering mud flow; and a battery bar that connects the pulse tube to the probe, forming a battery string and providing stable power to both the pulse tube and the probe.

[0003] However, the existing battery string connectors use aluminum alloy connectors, which are rigid connections and have poor resistance to impact and vibration. In complex working conditions of impact and vibration downhole, the battery string is often damaged due to impact and vibration, resulting in no MWD signal.

[0004] Therefore, in view of this, we have studied and improved the existing structure and its shortcomings, and provided a battery string structure for a downhole wireless drilling surveying instrument, in order to achieve a more practical value. Utility Model Content

[0005] In view of the problems mentioned in the background art above, this utility model provides a battery string structure for a downhole wireless drilling survey instrument.

[0006] The technical solution adopted by this utility model is as follows: a battery string structure for a downhole wireless drilling surveying instrument, including a battery rod, a connecting short, a shock absorber and a first pressure-resistant cylinder, wherein a second pressure-resistant cylinder is provided at the end of the connecting short; the shock absorber is disposed between the connecting short and the battery rod to realize the connection between the two; the first pressure-resistant cylinder is sleeved outside the battery rod and the shock absorber and connected to the first end of the connecting short.

[0007] Furthermore, the shock absorber includes a first connecting section, a shock absorber section, and a second connecting section. The first connecting section is connected to a connecting short circuit, and the second connecting section is connected to the battery rod. The first connecting section and the second connecting section are connected through the shock absorber section, which is made of rubber and is disposed in the cavity formed between the first connecting section and the second connecting section.

[0008] Furthermore, the first connecting segment includes a first connecting cylinder, on which a connecting block is provided, and the connecting block has at least two connecting ports circumferentially.

[0009] Furthermore, the second connecting section includes a second connecting cylinder, on which a semi-cylindrical block is provided to cooperate with the battery rod, and the semi-cylindrical block is provided with mounting holes.

[0010] Furthermore, the first connecting segment is provided with a first wire-passing hole, and the second connecting segment is provided with a second wire-passing hole that is perpendicularly connected to the first wire-passing hole.

[0011] Furthermore, the cavity formed between the first connecting segment and the second connecting segment consists of two interconnected arc-shaped cross sections.

[0012] Furthermore, the first and second pressure-resistant cylinders are respectively threaded to the beginning and end of the connecting short circuit.

[0013] The beneficial effects of this utility model are:

[0014] By using a shock absorber as a buffer between the short-circuit connector and the battery rod, the traditional rigid aluminum alloy connection of the battery rod is changed, transforming the connection from rigid to flexible. Simultaneously, a first pressure-resistant cylinder provides overall encapsulation protection for both the battery rod and the shock absorber. This design utilizes the elastic properties of the shock absorber to absorb and disperse vibration energy under complex downhole conditions, and the first pressure-resistant cylinder further enhances the overall structure's compressive strength, preventing damage to the battery rod due to localized stress concentration. Attached Figure Description

[0015] This utility model can be further illustrated by the non-limiting embodiments given in the accompanying drawings;

[0016] Figure 1 This is a schematic diagram of the overall assembly of this utility model;

[0017] Figure 2 This is a partial schematic diagram of the present utility model;

[0018] Figure 3 This is a schematic diagram of the shock absorber of this utility model;

[0019] Figure 4 This is a cross-sectional view of the shock absorber of this utility model;

[0020] The attached diagram is labeled as follows:

[0021] Battery rod 1, connecting short circuit 2, first pressure-resistant cylinder 21, second pressure-resistant cylinder 22, shock absorber 3, first connecting cylinder 31, connecting block 32, connecting port 33, second connecting cylinder 34, semi-cylindrical block 35, mounting hole 36, shock-absorbing section 37, first wire hole 38, second wire hole 39. Detailed Implementation

[0022] like Figures 1-4 As shown, a battery string structure for a downhole wireless drilling surveying instrument includes a battery rod 1, a connecting short 2, a shock absorber 3, and a first pressure-resistant cylinder 21. The end of the connecting short 2 is provided with a second pressure-resistant cylinder 22. The shock absorber 3 is disposed between the connecting short 2 and the battery rod 1 to achieve the connection between the two. The first pressure-resistant cylinder 21 is sleeved on the battery rod 1 and the shock absorber 3 and connected to the beginning of the connecting short 2.

[0023] By adopting the above technical solution, the shock absorber 3 serves as a buffer component connecting the short-circuit 2 and the battery rod 1, changing the traditional rigid aluminum alloy connection structure and transforming the connection between the two from rigid to flexible. Simultaneously, a first pressure-resistant cylinder 21 is provided externally to form a comprehensive protective enclosure for the battery rod 1 and the shock absorber 3. This design utilizes the elastic properties of the shock absorber 3 itself to absorb and disperse the impact vibration energy under complex downhole conditions, and the first pressure-resistant cylinder 21 further enhances the overall structure's compressive strength, preventing damage to the battery rod 1 due to localized stress concentration.

[0024] The battery rod 1 is specifically designed for wireless drilling surveying instruments. In specific applications, the battery rod 1 is installed inside the first pressure-resistant cylinder 21. Both ends of the battery rod 1 are equipped with shock absorbers 3, and each shock absorber 3 is bolted to the connecting short connector 2. At the same time, the first end of the connecting short connector 2 is threadedly connected to the first pressure-resistant cylinder 21. The ends of the connecting short connector 2 are threadedly connected to the second pressure-resistant cylinder 22, which is used to install the directional probe and the pulse generator, respectively.

[0025] As a preferred embodiment, the shock absorber 3 includes a first connecting section, a shock absorber section 37, and a second connecting section. The first connecting section is connected to the connecting short circuit 2, and the second connecting section is connected to the battery rod 1. The first connecting section and the second connecting section are connected through the shock absorber section 37, which is made of rubber and is disposed within the cavity formed between the first connecting section and the second connecting section. Figure 3-4 As shown, the damping component 3 is made of aluminum alloy, except for the damping section which is made of rubber. The rubber material has good elasticity and resilience, and can generate large deformation to absorb energy when subjected to compression or shear force, and return to its original shape after the load is removed. This structure achieves effective dissipation of vibration energy and avoids the problem of vibration being directly transmitted to the battery rod 1 under the traditional hard connection method.

[0026] As a preferred embodiment, the first connecting segment includes a first connecting cylinder 31, on which a connecting block 32 is provided, and the connecting block 32 has at least two connecting ports 33 circumferentially open. In this embodiment, as... Figure 3As shown, four connection ports 33 are provided. In actual use, bolts are passed through the connection ports 33 to fix the connection to the connecting short circuit 2. Through multi-point fixation, the connection strength and torsional resistance between the first connection section and the connecting short circuit 2 are improved, thereby enhancing the overall rigidity and anti-displacement capability of the entire battery string structure. This is especially important in the environment of frequent vibration and rotation in underground wells, and can effectively prevent signal interruption or structural failure caused by loose connections.

[0027] As a preferred embodiment, the second connecting section includes a second connecting cylinder 34, on which a semi-cylindrical block 35 is provided to mate with the battery rod 1. The semi-cylindrical block 35 has mounting holes 36. In practical use, bolts are inserted through the mounting holes 36 to secure the section to the battery rod 1. This design enhances the connection stability between the second connecting section and the battery rod 1, making it less prone to detachment or misalignment, especially under axial tension or lateral impact. This structural form effectively improves the overall mechanical reliability of the battery string, providing a guarantee for long-term, high-intensity downhole operations.

[0028] As a preferred embodiment, the first connecting segment has a first wire-passing hole 38, and the second connecting segment has a second wire-passing hole 39 that is perpendicularly connected to the first wire-passing hole 38. The perpendicular connection between the first wire-passing hole 38 and the second wire-passing hole 39 facilitates the passage of cables between the first and second connecting segments without bending or tangling. This wiring path design takes into account the rationality of spatial layout, avoiding wire wear or breakage problems caused by poor wiring. At the same time, the perpendicularly intersecting structure also simplifies the assembly process and improves production efficiency.

[0029] As a preferred embodiment, the cavity formed between the first and second connecting sections is composed of two interconnected arc-shaped cross sections. This structural design improves the adaptability and response speed of the damping section 37 under multi-directional vibration, enabling it to exert a good buffering effect under impact loads in various directions, and further enhancing the stability and durability of the battery string in the complex vibration environment downhole.

[0030] As a preferred embodiment, the first pressure-resistant cylinder 21 and the second pressure-resistant cylinder 22 are threadedly connected to the beginning and end of the connecting short connector 2, respectively. The length of the first pressure-resistant cylinder 21 is extended to accommodate the connection of the shock absorber, completely enclosing the shock absorber 3 and the battery rod 1 within the first pressure-resistant cylinder. The threaded connection allows for quick assembly and disassembly and secure connection between the pressure-resistant cylinder and the connecting short connector 2. The threaded structure provides excellent sealing and anti-loosening performance after pre-tightening, making it particularly suitable for downhole environments with high-frequency vibrations. Furthermore, the threaded connection facilitates maintenance and replacement without affecting the integrity of the overall structure.

[0031] The present invention has been described in detail above. The specific embodiments are provided only to help understand the method and core idea of ​​the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A battery string structure for a downhole wireless drilling surveying instrument, characterized in that: include Battery rod (1); A short circuit (2) is connected, and a second pressure-resistant cylinder (22) is provided at the end of the short circuit (2); The shock absorber (3) is disposed between the connecting short circuit (2) and the battery rod (1) to realize the connection between the two; The first pressure-resistant cylinder (21) is sleeved outside the battery rod (1) and the shock absorber (3) and connected to the head end of the connecting short circuit (2).

2. The battery string structure for a downhole wireless drilling surveying instrument according to claim 1, characterized in that: The shock absorber (3) includes a first connecting section, a shock absorber section (37), and a second connecting section. The first connecting section is connected to the connecting short circuit (2), and the second connecting section is connected to the battery rod (1). The first connecting section and the second connecting section are connected through the shock absorber section (37). The shock absorber section (37) is made of rubber and is disposed in the cavity formed between the first connecting section and the second connecting section.

3. The battery string structure for a downhole wireless drilling surveying instrument according to claim 2, characterized in that: The first connecting segment includes a first connecting cylinder (31), and a connecting block (32) is provided on the first connecting cylinder (31). The connecting block (32) has at least two connecting ports (33) circumferentially open.

4. A battery string structure for a downhole wireless drilling surveying instrument according to claim 2 or 3, characterized in that: The second connecting section includes a second connecting cylinder (34), on which a semi-cylindrical block (35) is provided to cooperate with the battery rod (1), and the semi-cylindrical block (35) is provided with a mounting hole (36).

5. The battery string structure for a downhole wireless drilling surveying instrument according to claim 2, characterized in that: The first connecting segment has a first wire hole (38), and the second connecting segment has a second wire hole (39) that is perpendicularly connected to the first wire hole (38).

6. The battery string structure for a downhole wireless drilling surveying instrument according to claim 2, characterized in that: The cavity formed between the first connecting segment and the second connecting segment consists of two interconnected arc-shaped cross sections.

7. The battery string structure for a downhole wireless drilling surveying instrument according to claim 1, characterized in that: The first pressure-resistant cylinder (21) and the second pressure-resistant cylinder (22) are respectively threaded to the beginning and end of the connecting short circuit (2).

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