Hole bottom data acquisition system for static sounding while drilling

Abstract

The utility model provides a hole bottom data acquisition system for static sounding while drilling, which comprises a ground data matching module and a test assembly, the test assembly comprises a positioning module, a hole bottom data acquisition module and a test module, and the test module comprises a test probe. The positioning module is used for being matched with the inner wall of a drill pipe to fix the hole bottom data acquisition module and the test module at the bottom; the hole bottom data acquisition module comprises a power supply device, a data conversion device and a test end data transceiving device, the ground data matching module comprises an acquisition end data matching module, the acquisition end data matching module is connected with the taken hole bottom data acquisition module, and the acquisition end data matching module is provided with a reading module. And after the acquisition end data matching module and the test end data receiving and transmitting device perform time matching, the reading module reads the data of the memory. According to the utility model, the phenomenon of cable immersion short circuit in a cable data transmission mode adopted by the in-situ test while drilling is solved, and the operation is simplified.

Description

Technical Field

[0001] The utility model relates to an in-situ testing technology for rock and soil investigation, in particular to a hole bottom data acquisition system for static penetration while drilling. Background Art

[0002] In-situ testing technology for geotechnical investigation can provide reliable geotechnical physical and mechanical property parameters for underground space engineering design. As deep underground space development projects proceed, it is necessary to obtain deeper geotechnical physical and mechanical property parameters through in-situ testing.

[0003] The applicant's prior application (ZL202110858093.1) provides a cabled lightweight in-situ test-while-drilling system and an in-situ test construction method. During the implementation of this geotechnical engineering survey method, we found that the application of in-situ test-while-drilling technology can effectively solve the problems of "insufficient depth" and "inaccurate measurement" faced by traditional in-situ testing technology. The reason for this discovery is that the data acquisition method of the in-situ test-while-drilling technology mentioned in the patent adopts a cabled data transmission method, that is, the multi-core cable in the armored cable passes through the positioning device of the test assembly and connects to the in-situ test probe, and the wiring segment is built into the cable storage device of the test assembly.

[0004] However, this method also has some defects. First, the wiring operation is relatively complicated and requires a high level of technical proficiency and experience. Second, the structure of the device is relatively heavy, which increases the difficulty and labor intensity of construction in actual operation. More seriously, the wiring is prone to water short circuit in an environment of long-term groundwater immersion, which will lead to data acquisition failure and thus affect the reliability of the entire survey results. In addition, during the test, the mud filled in the drill pipe and the limited electromagnetic shielding effect make the wireless transmission effect extremely poor, so this method is not suitable for static penetration test while drilling. The existence of these problems limits the widespread application of this technology in actual engineering, and it is in urgent need of further improvement and optimization. Utility Model Content

[0005] This utility model provides a bottom hole data acquisition system for static penetration while drilling (SWD) testing, which solves the problem of using cabled data transmission for in-situ testing while drilling, avoiding the cumbersome operation of passing multi-core cables through the positioning device of the test assembly and connecting them to the in-situ test probe. The integrated package of the bottom hole data acquisition device reduces exposed nodes and improves the reliability of the SWD test system. The cable storage device of the in-situ test assembly is eliminated, the structure of the test assembly is streamlined, and the test system is lightweight and easy to operate. The specific plan is as follows:

[0006] A bottom hole data acquisition system for static penetration while drilling is installed in the drill pipe. The bottom hole data acquisition system includes a ground data matching module and a test assembly.

[0007] The test assembly includes a positioning module, a bottom hole data acquisition module, and a test module connected in sequence from top to bottom. The test module includes a test probe that touches the bottom of the hole and is in communication with the bottom hole data acquisition module. The positioning module is used to cooperate with the inner wall of the drill pipe to fix the bottom hole data acquisition module and the test module at its bottom.

[0008] The bottom hole data acquisition module includes a power supply device, a data conversion device, and a test end data transceiver device. The power supply device provides power to the bottom hole data acquisition module and the test probe. The data conversion device is in communication with the test probe and the test end data transceiver device. The data conversion device converts the analog signal of the test probe into a digital signal and transmits it to the test end data transceiver device. The test end data transceiver device is provided with a memory.

[0009] The ground data matching module includes a collection end data matching module, which is connected to the bottom hole data collection module that takes the ground out of the drill pipe. The collection end data matching module is provided with a reading module. After the collection end data matching module and the test end data transceiver device perform time matching, the reading module reads the data in the memory.

[0010] Furthermore, the test module further comprises a test probe rod, a limit device and a cable, wherein the bottom of the test probe rod is fixedly connected to the test probe, and the top of the test probe rod is connected to the limit device;

[0011] The cable is arranged in the internal channel of the test probe and connects the data conversion device and the test probe;

[0012] A retaining ring is provided in the drill pipe to cooperate with the limiting device to prevent the test module from falling off.

[0013] Furthermore, the bottom hole data acquisition module is provided with a protective housing, in which the power supply device, the data conversion device, and the test end data transceiver device are all sealed and installed. A communication interface for connecting to the acquisition end data matching module is provided on one side of the protective housing;

[0014] The bottom of the protective shell is detachably connected to the limit device through threads or bolts, and a detachable sealing cover is installed on the top of the protective shell. The top of the detachable sealing cover is provided with a connecting portion connected to the positioning module.

[0015] Furthermore, the ground data matching module is provided with a placement platform, and the bottom hole data acquisition module taken out from the drill pipe is placed on the placement platform.

[0016] Furthermore, a suspension module for connecting a load-bearing cable is fixed on the top of the positioning module, and the test assembly is lowered into the drill pipe through the load-bearing cable.

[0017] This utility model splits the test system into an in-hole test assembly and a ground data matching module. Before testing, the in-hole test assembly and the ground data matching module are time-matched to align the two system times. The in-hole test assembly is then placed into the drill pipe for testing. After the test is completed, the test assembly is removed and time-matched with the ground data matching module, and the corresponding in-situ test data is exported. By adopting the above technical solution, the innovation of this utility model lies in:

[0018] 1) This solves the problem of cable short circuit caused by water immersion in the cable data transmission mode of in-situ testing while drilling, and simplifies the tedious operation of passing the multi-core cable through the positioning device of the test assembly and connecting it to the in-situ test probe.

[0019] 2) Integrated packaging of bottom hole data acquisition device reduces exposed nodes and improves the reliability of the test while drilling system.

[0020] 3) The cable storage device of the in-situ test assembly has been eliminated, streamlining the structure of the test assembly and making the test system lightweight for easier construction and operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0022] Figure 1 This is a schematic diagram of the test assembly of the utility model installed in the drill pipe;

[0023] Figure 2 This is a schematic diagram of the ground data matching module;

[0024] Figure 3 This is the composition diagram of the bottom hole data acquisition module;

[0025] Figure 4 This is a schematic diagram of the data matching principle of the utility model. DETAILED DESCRIPTION

[0026] In the following description, numerous specific details are provided to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features known in the art are not described to avoid confusion with the present invention.

[0027] In order to fully understand the present invention, detailed steps and detailed structures will be provided in the following description to illustrate the technical solution of the present invention. The preferred embodiments of the present invention are described in detail below. However, in addition to these detailed descriptions, the present invention may also have other implementation methods.

[0028] Reference Figure 1-3 As shown, the present invention provides a bottomhole data acquisition system for static penetration while drilling (CWD). The bottomhole data acquisition system is installed within a drill pipe 6, which is connected to a drilling rig to excavate a test hole in the soil. The bottomhole data acquisition system includes a surface data matching module 4 and a test assembly that can be inserted into the drill pipe 6. The test assembly includes a positioning module 3, a bottomhole data acquisition module 2, and a test module 1, which are connected in sequence from top to bottom.

[0029] The test module 1 includes a test probe 11, a test probe rod 12, a stopper 13, and a cable 14. The top of the test probe 11 connects to the test probe rod 12 for deep testing in the formation. The stopper 13 is installed on the top of the test probe rod 12. A retaining ring is provided inside the drill pipe 6. The retaining ring cooperates with the stopper 13 to prevent the test module 1 from falling out of the drill pipe 6 due to gravity. The cable 14 passes through a reserved channel 131 at the connection of the stopper 13 and connects to the bottom hole data acquisition module 2, transmitting the data obtained by the test probe 11 to the bottom hole data acquisition module 2.

[0030] The bottom hole data acquisition module 2 includes a protective housing 21, a power supply 22, a data conversion device 23, a test end data transceiver 24, and a removable sealing cover 25. The protective housing 21 is a semi-open cavity structure with a threaded hole 211 at the bottom to facilitate the connection between the protective housing 21 and the limit device 13.

[0031] The power supply device 22, the data conversion device 23, and the test end data transceiver device 24 are located in the cavity of the protective shell 21. The power supply device 22 provides the data conversion device 23 and the test end data transceiver device 24 with power for data conversion and transmission and reception, and provides the test probe 11 with the power required for testing. The data conversion device 23 is connected to the test end data transceiver device 24, and the data conversion device 23 is connected to the cable 14. The data conversion device 23 converts the analog signal into a digital signal and transmits it to the test end data transceiver device 24. Before the test device is placed into the bottom of the hole, it is necessary to check whether the system time of the test end data transceiver device 24 is consistent with the system time of the acquisition end data matching module 42. The test end data transceiver device 24 applies voltage to the test probe 11 through periodic control to obtain an analog signal. The test end data transceiver device 24 is provided with a memory and has the function of storing data (static detection data and corresponding system time).

[0032] The detachable sealing cover 25 is installed on the top of the protective shell 21 to prevent water in the borehole from entering the protective shell 21 . A connecting portion 251 connected to the positioning module 3 is provided on the top of the detachable sealing cover 25 .

[0033] Positioning module 3 is used to lock the in-situ test assembly when it is lowered to the test depth. The relevant structure can be found in the applicant's prior application (ZL202110858093.1) and is not described in detail here. A suspension module 7 is fixed to the top of positioning module 3 for connecting to a load-bearing cable 5, which is used to lower the test assembly into the drill pipe 6.

[0034] The ground data matching module 4 includes a placement platform 41, a data acquisition module 42, a power supply 43, and a data display screen 44. When the test probe 11 begins to penetrate the soil, the data acquisition module 42 begins recording the probe's depth and the corresponding system time. The recording of the probe's 11 depth versus system time can be done manually, using visual displacement measurement, or automatically.

[0035] After the test is complete, the test assembly, consisting of the positioning module 3, bottom-hole data acquisition module 2, and test module 1, is removed from the hole via the load-bearing cable 5. The removable sealing cover 25 is opened, and the test-end data transceiver 24 is removed and placed on the placement platform 41, where it is connected to the acquisition-end data matching module 42. The acquisition-end data matching module 42 receives the data from the test-end data transceiver 24 and, based on the principle of system time synchronization, matches the depth value with the exploration data. The results are then visualized on the data display screen 44.

[0036] The above describes the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can use the above-mentioned disclosed methods and technical contents to make many possible changes and modifications to the technical solutions of the present invention without departing from the scope of the technical solution of the present invention, or modify them into equivalent embodiments with equivalent changes, which does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention that do not depart from the content of the technical solution of the present invention are still within the scope of protection of the technical solution of the present invention.

Claims

1. A bottom hole data acquisition system for static penetration while drilling, wherein the bottom hole data acquisition system is installed in a drill pipe (6), characterized in that: The bottom hole data acquisition system comprises a surface data matching module (4) and a test assembly, The test assembly comprises a positioning module (3), a bottom hole data acquisition module (2) and a test module (1) connected in sequence from top to bottom, the test module (1) comprising a test probe (11) that touches the bottom of the hole and is in communication connection with the bottom hole data acquisition module (2), and the positioning module (3) is used to cooperate with the inner wall of the drill pipe (6) to fix the bottom hole data acquisition module (2) and the test module (1) at its bottom; The bottom hole data acquisition module (2) comprises a power supply device (22), a data conversion device (23), and a test end data transceiver device (24); the power supply device (22) provides electric energy to the bottom hole data acquisition module (2) and the test probe (11); the data conversion device (23) is communicatively connected with the test probe (11) and the test end data transceiver device (24); the data conversion device (23) converts the analog signal of the test probe (11) into a digital signal and transmits it to the test end data transceiver device (24); the test end data transceiver device (24) is provided with a memory; The surface data matching module (4) includes a collection end data matching module (42), the collection end data matching module (42) is connected to the bottom hole data collection module (2) taken out from the drill pipe (6), the collection end data matching module (42) is provided with a reading module, and after the collection end data matching module (42) and the test end data transceiver (24) perform time matching, the reading module reads the data in the memory.

2. A bottom hole data acquisition system for static penetration while drilling according to claim 1, characterized in that: The test module (1) further comprises a test probe (12), a limiting device (13) and a cable (14); the bottom of the test probe (12) is fixedly connected to the test probe (11); the top of the test probe (12) is connected to the limiting device (13); and a retaining ring is provided in the drill pipe (6) to cooperate with the limiting device (13) to prevent the test module (1) from being separated; The cable (14) is arranged in the internal channel of the test probe rod (12) and connects the data conversion device (23) and the test probe (11).

3. A bottom hole data acquisition system for static penetration while drilling according to claim 2, characterized in that: The bottom hole data acquisition module (2) is provided with a protective shell (21), the power supply device (22), the data conversion device (23), and the test end data transceiver (24) are all sealed and installed in the protective shell (21), and a communication interface for connecting to the acquisition end data matching module (42) is provided on one side of the protective shell (21); The bottom of the protective shell (21) is detachably connected to the limiting device (13) via threads or bolts, a detachable sealing cover (25) is installed on the top of the protective shell (21), and a connecting portion (251) connected to the positioning module (3) is provided on the top of the detachable sealing cover (25).

4. A bottom hole data acquisition system for static penetration while drilling according to claim 2, characterized in that: The surface data matching module (4) is provided with a placement platform (41), and the bottom hole data acquisition module (2) taken out from the drill pipe (6) is placed on the placement platform (41).

5. The bottom hole data acquisition system for static penetration while drilling according to claim 1, characterized in that: A suspension module (7) for connecting a load-bearing cable (5) is fixed on the top of the positioning module (3), and the test assembly is lowered into the drill pipe (6) via the load-bearing cable (5).

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