A downhole cone penetration test tool flushing and protection device
Patent Information
- Application Number
- CN202522541478.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-29
- Publication Date
- 2026-10-13
- Estimated Expiration
- 2035-11-29
AI Technical Summary
[0004]因此CPT探杆工具在使用后需要进行清洗操作，并放置在特定环境下对其进行保护，需要配置其他相关的设备使用，导致CPT探测工序繁琐
1.本实用新型装置整体能够在施工过程中、以及施工结束后存放CPT，集合鼠洞和冲洗功能的一体化装置，第一保护壳、第二保护壳和保护罩三者之间采用可拆卸的方式连接安装，可以更换不同尺寸的第二保护壳对不同长度CPT工具提供保护功能。
Smart Images
Figure CN224849863U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of in-situ testing technology for geotechnical exploration, and in particular relates to a flushing and protection device for a downhole static cone penetration test tool. Background Technology
[0002] Downhole static cone penetration testing (PCP) is an important method for in-situ testing. It involves drilling to the target formation using a top-drive drilling rig, then using a CPT winch to lower a penetration tool equipped with a static cone penetration probe (PCP probe) into the drill pipe connected to the top-drive rig's bell mouth. The PCP probe is then lowered to the bottom of the drill bit, and static cone penetration data is collected. This method allows for segmented data acquisition and is not limited by formation depth or sand layer thickness.
[0003] After the static cone penetration test (CPPT) tool has been inserted, the hydraulic piston of the tool is fully depressed and the probe rod is fully extended. After a single section of penetration is completed, the tool is retrieved using a CPT winch. Since the total length of the 3m travel penetrator is 7m, after being retrieved to the deck, the mud and sand on the extended probe rod need to be flushed off. After the mud and sand are flushed off, the tool needs to be placed into a custom-made "mouse hole" on the deck.
[0004] Therefore, CPT probes need to be cleaned after use and placed in a specific environment for protection. They also require the use of other related equipment, making the CPT detection process cumbersome.
[0005] This invention provides a flushing and protection device for downhole static cone penetration testing tools to solve the above problems. Utility Model Content
[0006] To achieve the above objectives, the present invention adopts the following technical solution: A flushing and protection device for a downhole static cone penetration test tool includes a first protective shell and a second protective shell. The second protective shell is installed at the lower end of the first protective shell. A probe protective shell is installed inside the second protective shell. A protective cover is installed at the bottom of the second protective shell. Several drainage holes are provided at the lower end of the second protective shell. A double flange limiting joint is provided at the upper end of the first protective shell. An annular flushing device is installed at the top of the first protective shell.
[0007] As a preferred option, the central axes of the first protective shell, the second protective shell, and the probe protective shell are aligned.
[0008] As a preferred option, the second protective shell is connected to the first protective shell via a flange.
[0009] As a preferred option, the probe protective shell is welded inside the second protective shell.
[0010] As a preferred option, the lower end of the protective cover is closed, and the upper end of the protective cover is open and faces the probe protective shell.
[0011] As a preferred option, the protective cover is threadedly connected to the second protective shell.
[0012] Compared with existing technologies, the advantages of this utility model are: 1. The device of this utility model can store CPT during and after construction. It is an integrated device that combines rat hole and flushing functions. The first protective shell, the second protective shell and the protective cover are connected and installed in a detachable manner. Different sizes of the second protective shell can be replaced to provide protection for CPT tools of different lengths. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the present invention.
[0014] Figure 2 This is a schematic diagram of the second protective shell of this utility model.
[0015] The labels in the diagram are as follows: 1. First protective shell; 2. Second protective shell; 3. Probe rod protective shell; 4. Protective cover; 5. Drain hole; 6. Double flange limit joint; 7. Annular flushing device; 8. Flange. Detailed Implementation
[0016] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following embodiments or drawings are used to illustrate this utility model, but are not intended to limit the scope of this utility model.
[0017] A flushing and protection device for downhole static penetration testing tools, such as Figure 1 As shown, it includes a first protective shell 1 and a second protective shell 2. The second protective shell 2 is installed at the lower end of the first protective shell 1. A probe protective shell 3 is installed inside the second protective shell 2. A protective cover 4 is installed at the bottom of the second protective shell 2. At least three drainage holes 5 are provided at the lower end of the second protective shell 2. A double flange limiting joint 6 is provided at the upper end of the first protective shell 1. An annular flushing device 7 is installed at the top of the first protective shell 1.
[0018] The device can store CPTs during and after construction. It is an integrated device that combines rat hole and flushing functions. The first protective shell 1, the second protective shell 2 and the protective cover 4 are connected and installed in a detachable manner. Different sizes of the second protective shell 2 can be replaced to provide protection for CPT tools of different lengths, and it is convenient to store or take out CPT tools, so as to deal with CPT tests more flexibly.
[0019] The design of the double flange limiting joint 6 on the first protective shell 1 ensures that even if the lower flange is damaged due to excessive stress, the upper spare flange can still achieve the purpose of limiting.
[0020] The annular flushing device 7 is used to clean the CPT probe rod. The annular flushing device 7 is existing technology. The annular flushing device 7 can use an annular air knife device to clean the CPT probe rod with airflow wiping, and flush the CPT probe rod with attached mud and sand in 360°, reducing the damage to the sealing ring on the equipment caused by mud and sand.
[0021] The central axes of the first protective shell 1, the second protective shell 2, and the probe protective shell 3 coincide. The second protective shell 2 is connected to the first protective shell 1 through the flange 8, and the probe protective shell 3 is welded inside the second protective shell 2.
[0022] The lower end of the protective cover 4 is closed, and the upper end of the protective cover 4 is open and faces the probe protective shell 3. The outer diameter of the lower end of the protective cover 4 is smaller than the outer diameter of the upper end of the protective cover 4. The protective cover 4 is threadedly connected to the second protective shell 2.
[0023] The first protective shell 1, the second protective shell 2, and the protective cover 4 are connected by flanges and threads, so the second protective shell 2 of different sizes can be replaced to serve as a protective shell for CPT penetration tools of different lengths.
[0024] CPT test procedure: 1. First, assemble the first protective shell 1, the second protective shell 2, and the protective cover 4 to form a complete protective structure, place it horizontally on the deck surface, and place the CPT tool inside the probe protective shell 3 of the first protective shell 1 and the second protective shell 2. 2. Before starting the CPT test, remove the protective cover 4 from the second protective shell 2. Install the CPT probe onto the CPT tool through the opening at the bottom of the second protective shell 2. The CPT probe and the CPT tool together form a complete CPT probe rod. After completing the CPT probe test, reinstall the protective cover 4 onto the second protective shell 2. 3. Wrap the lifting sling around the double flange limiting joint 6, then use the lifting system to lift the first protective shell 1 vertically and place it into the opening on the deck surface. The double flange limiting joint 6 is positioned above the opening, limiting the upper end of the first protective shell 1 to the deck surface. 4. After the single-segment CPT data acquisition is completed, remove the CPT tool from the drill pipe and clean the CPT probe with mud and sand attached through the annular flushing device 7. After flushing, put the CPT probe back into the first protective shell 1, the second protective shell 2, and the probe protective shell 3. 5. Excess fresh water and sediment on the CPT probe flow out through drainage hole 5.
[0025] Drill pipe is a component used in construction and is a type of existing technology.
[0026] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.
Claims
1. A flushing and protection device for a downhole static cone penetration test tool, characterized in that: It includes a first protective shell (1) and a second protective shell (2). The second protective shell (2) is installed at the lower end of the first protective shell (1). A probe protective shell (3) is installed inside the second protective shell (2). A protective cover (4) is installed at the bottom of the second protective shell (2). Several drainage holes (5) are provided at the lower end of the second protective shell (2). A double flange limit joint (6) is provided at the upper end of the first protective shell (1). A ring flushing device (7) is installed at the top of the first protective shell (1).
2. The flushing and protection device for a downhole static penetration test tool according to claim 1, characterized in that: The central axes of the first protective shell (1), the second protective shell (2), and the probe protective shell (3) coincide.
3. The flushing and protection device for a downhole static penetration test tool according to claim 2, characterized in that: The second protective shell (2) is connected to the first protective shell (1) via a flange (8).
4. The flushing and protection device for a downhole static penetration test tool according to claim 2, characterized in that: The probe protective shell (3) is welded inside the second protective shell (2).
5. The flushing and protection device for a downhole static penetration test tool according to claim 1, characterized in that: The lower end of the protective cover (4) is closed, and the upper end of the protective cover (4) is open and faces the probe protective shell (3).
6. The flushing and protection device for a downhole static penetration test tool according to claim 5, characterized in that: The protective cover (4) is threadedly connected to the second protective shell (2).