Oil field while-drilling instrument protective sleeve with discontinuous wear-resistant belt

Abstract

The utility model belongs to the technical field of logging instruments, and discloses an oil field while-drilling instrument protective sleeve with a discontinuous wear-resistant belt, the oil field while-drilling instrument comprises a main body and a protective sleeve, a spiral rib is arranged on the protective sleeve, and a receiver is arranged in the protective sleeve; the device is characterized in that a wear-resistant belt is arranged outside the spiral rib, and a window is formed in the position, corresponding to the receiver, of the wear-resistant belt; the wear-resistant belt comprises a transition layer, a middle layer and a wear-resistant layer from inside to outside, windows of all the layers are sequentially increased, and fillets are arranged on the outer sides of the windows. According to the structure of the protective sleeve, the wear resistance of the protective sleeve is improved through the three layers of wear-resistant belts, and the protective sleeve is well protected. And through windowing, good communication of the receiver and the like is ensured. And the sizes of the windows are sequentially increased, so that the receiving or transmitting angle of the receiver is enlarged. And meanwhile, the overall stress is reduced, and the risk of cracks is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of logging instrument technology, specifically relating to a protective sleeve for oilfield drilling instruments with a discontinuous wear-resistant band. Background Technology

[0002] Oilfield logging requires specific instruments, such as logging-while-drilling (LWD) instruments. These instruments require components to contact the wellbore to perform measurements. However, due to the downhole environment, these contact parts experience significant wear, severely impacting the instrument's lifespan and the accuracy of the measurement results.

[0003] Because the protective sleeve contains receivers (including but not limited to logging instrument radiation sources or sound wave emitting and receiving devices), adding an outer layer of protection might block the signal, affecting signal transmission and the instrument's performance. Therefore, existing protective sleeves lack wear-resistant bands, resulting in a short service life. Utility Model Content

[0004] The purpose of this invention is to provide a protective sleeve for oilfield drilling instruments with a discontinuous wear-resistant band, in order to solve the problems in the prior art.

[0005] This utility model is achieved through the following technical solution: a protective sleeve for an oilfield drilling instrument with a discontinuous wear-resistant band, wherein the oilfield drilling instrument includes a main body and a protective sleeve, the protective sleeve is provided with a spiral rib, and a receiver is provided inside the protective sleeve; the feature is that a wear-resistant band is provided outside the spiral rib, and the wear-resistant band is provided with a window at the position corresponding to the receiver; the wear-resistant band includes a transition layer, an intermediate layer and a wear-resistant layer from the inside out, and the windows of each layer increase in size sequentially, and the outer side of the window is provided with a rounded corner.

[0006] Furthermore: the wear-resistant belt includes a transition layer that has good adhesion to the protective sleeve, a wear-resistant layer with good wear resistance, and a connecting layer that connects the transition layer and the wear-resistant layer, which are fused together in sequence.

[0007] Furthermore, the transition layer, intermediate layer, and wear-resistant layer are respectively a 625 alloy layer, a WC30 alloy layer, and a WC60 alloy layer.

[0008] The beneficial effects of this utility model are as follows: The three-layered wear-resistant strips in this structure improve the wear resistance of the protective sleeve, providing excellent protection. The openings ensure good communication with the receiver, etc. The progressively increasing window size expands the receiving or transmitting angle of the receiver.

[0009] The three-layer wear-resistant band, arranged from the inside out, features a transition layer that bonds well with the protective sleeve, improving the bonding strength. The wear-resistant layer enhances wear resistance, while the transition layer ensures a good bond between the two. This allows the entire wear-resistant band to satisfy both bonding requirements and strength requirements while simultaneously improving wear resistance. Furthermore, the stepped arrangement of the three layers, with progressively larger and rounded corners at the openings, significantly reduces stress at these openings, thereby lowering the overall stress and reducing the risk of cracking. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0011] Figure 2 This is a structural schematic diagram of the protective sleeve;

[0012] Figure 3 yes Figure 2 Schematic diagram of the M-direction cross-section structure;

[0013] Figure 4 yes Figure 3 A magnified structural diagram at point S in the diagram.

[0014] The numbers in the diagram are explained as follows: 100 is the protective sleeve; 101 is the spiral rib; 102 is the receiver; 200 is the main body; 300 is the wear-resistant strip; 301 is the window; 302 is the rounded corner; 310 is the transition layer; 320 is the intermediate layer; and 330 is the wear-resistant layer. Detailed Implementation

[0015] Reference Appendix Figure 1-4 This utility model provides a protective sleeve for an oilfield drilling instrument with a discontinuous wear-resistant band. The oilfield drilling instrument includes a main body 200 and a protective sleeve 100. The protective sleeve 100 is provided with a spiral rib 101 and a receiver 102 is provided inside the protective sleeve. The wear-resistant band 300 is provided on the outside of the spiral rib by laser cladding. The wear-resistant band has a window 301 at the position corresponding to the receiver. The wear-resistant band includes a transition layer 310, an intermediate layer 320 and a wear-resistant layer 330 from the inside to the outside, and the window of each layer increases in size in sequence. The outer side of the window is provided with a rounded corner 302.

[0016] The three-layered wear-resistant strip enhances the wear resistance of the protective sleeve, providing excellent protection. The window design ensures reliable communication with the receiver. The progressively increasing window size creates a larger included angle, expanding the receiver's receiving and transmitting angle.

[0017] Preferably, the wear-resistant strip comprises a transition layer with good adhesion to the protective sleeve, a wear-resistant layer with good wear resistance, and a connecting layer connecting the transition layer and the wear-resistant layer, which are sequentially laser-clad. The three layers are arranged in a stepped manner, with each layer receding slightly to reduce abrupt changes in thickness, thus dividing the stress at the location of thickness change and reducing the occurrence of cracks.

[0018] Preferably, the transition layer, intermediate layer, and wear-resistant layer are 625 alloy layer, WC30 alloy layer, and WC60 alloy layer, respectively. The three-layer wear-resistant band is arranged from the inside out. The transition layer can bond well with the protective sleeve body, improving the bonding strength; the wear-resistant layer improves wear resistance; and the transition layer can bond the two well, thus ensuring that the entire wear-resistant band satisfies both bonding requirements and strength requirements while simultaneously improving wear resistance.

Claims

1. A protective sleeve for an oilfield drilling instrument with a discontinuous wear-resistant band, wherein the oilfield drilling instrument comprises a main body and a protective sleeve, the protective sleeve is provided with helical ribs, and a receiver is provided inside the protective sleeve; characterized in that: A wear-resistant strip is provided on the outside of the spiral rib, and the wear-resistant strip has an opening at the position of the corresponding receiver; the wear-resistant strip includes a transition layer, an intermediate layer and a wear-resistant layer from the inside to the outside, and the openings of each layer increase in size in sequence, and the outer side of the opening is provided with rounded corners.

2. The oilfield drilling instrument protection sleeve with non-continuous wear band of claim 1, wherein: The wear-resistant belt includes a transition layer that has good adhesion to the protective sleeve, a wear-resistant layer with good wear resistance, and a connecting layer that connects the transition layer and the wear-resistant layer, which are fused together in sequence.

3. The oilfield drilling instrument protection sleeve with non-continuous wear band of claim 1, wherein: The transition layer, intermediate layer, and wear-resistant layer are respectively a 625 alloy layer, a WC30 alloy layer, and a WC60 alloy layer.

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