Combined underground muon imaging while-drilling device and system

Abstract

The invention discloses a combined underground muon imaging while-drilling device and system. The while-drilling device comprises a combined drill rod; the combined drill rod comprises at least two connecting rods, a measuring section and a drill bit; the at least two connecting rods and the drill bit are sequentially connected in the axial direction. The measuring joints are mounted between the two adjacent connecting rods; the measuring section is provided with a muon imaging detector module, and the muon imaging detector module is used for measuring stratum density difference data. According to the geological exploration requirement, the device can be installed between any adjacent connecting rods so as to adjust the measurement position of the muon imaging detector; the miniaturized muon detector also solves the problems of large size, poor temperature and pressure resistance, vibration interference and the like of the muon detector, is adaptive to the combined drill rod, and can be conveniently assembled and quickly used according to measurement requirements.

Description

Technical Field

[0001] This invention relates to the field of geological exploration, and in particular to a combined downhole muon imaging drilling device and system. Background Technology

[0002] Logging While Drilling (LWD) technology can provide formation information during drilling to assist in geological exploration and development. However, current mainstream LWD technologies mainly rely on resistivity, gamma rays, neutrons, and acoustic waves. These methods have limitations such as limited detection penetration range, high dependence on formation density, and insufficient imaging accuracy, making it difficult to identify large-scale structures (such as faults). Muon imaging is a non-destructive testing technique based on cosmic ray muons. Due to their high penetrating power, muons can be used for imaging the interior of media with large density variations and have been applied in fields such as volcano monitoring and nuclear waste detection. However, traditional muon detectors are bulky, relying on large-area detection arrays; the electronic components of the detectors lack the environmental tolerance to high temperatures and pressures and drilling vibrations; and muon imaging measurement time is long.

[0003] Therefore, existing muon detectors are not compatible with drilling tools, and they are prone to damage and inconvenient to install and replace during drilling. Summary of the Invention

[0004] In view of this, the first aspect of the present invention discloses a combined downhole muon imaging drilling device.

[0005] The drilling equipment includes a combined drill pipe;

[0006] The combined drill pipe includes at least two connecting rods, a measuring section, and a drill bit;

[0007] At least two of the connecting rods and the drill bit are connected sequentially along the axial direction;

[0008] The measuring section is installed between two adjacent connecting rods;

[0009] The measurement section is equipped with a muon imaging detector module, which is used to analyze formation density difference data.

[0010] In some embodiments disclosed in this invention, the muon imaging detector module includes a ring-shaped package structure and a miniaturized muon detector, an anti-vibration photomultiplier tube, and a processing circuit disposed in the ring-shaped package structure.

[0011] The annular encapsulation structure is embedded on the outer periphery of the measuring section;

[0012] The miniaturized muon detector is used to generate ultraviolet fluorescence signals based on cosmic muon signals from the Earth's strata.

[0013] The vibration-resistant photomultiplier tube receives and converts the ultraviolet fluorescence signal into a measurement signal;

[0014] The processed signal acquires and stores the measured signal.

[0015] In some embodiments disclosed in this invention, the muon imaging detector module further includes a vibration-temperature suppression unit integrated into the miniaturized muon detector;

[0016] The vibration-temperature suppression unit acquires the longitudinal vibration signal of the drill bit and generates a reverse phase vibration wave acting on the miniaturized muon detector based on the longitudinal vibration signal.

[0017] In some embodiments disclosed in this invention, the annular packaging structure is made of titanium alloy material;

[0018] An alumina ceramic heat insulation layer is provided between the annular encapsulation structure and the measuring section.

[0019] The annular encapsulation structure has an incident window facing the outside of the measuring section, and the incident window is a silicon carbide protective sheet.

[0020] In some embodiments disclosed in this invention, an attitude sensor is disposed within the annular packaging structure;

[0021] The attitude sensor collects the attitude data of the current measurement segment;

[0022] The processing circuit receives and stores the attitude data.

[0023] In some embodiments disclosed in this invention, the axial channels of two adjacent connecting rods are connected through the second sealing sleeve, the positioning section, and the device section;

[0024] The annular packaging structure is sleeved on the outer periphery of the device section, and the positioning section presses the annular packaging structure against the device section axially.

[0025] In some embodiments disclosed in this invention, the positioning section has an antenna ring arranged axially on the side near the annular packaging structure, and the antenna ring is pressed between the positioning section and the annular sealing structure.

[0026] In some embodiments disclosed in this invention, the antenna ring is connected to the axial channel via an antenna cable arranged in the positioning section.

[0027] Furthermore, a second aspect of the present invention discloses a combined downhole muon imaging drilling system.

[0028] The drilling equipment includes the combined downhole muon imaging drilling equipment and the surface processing platform;

[0029] The combined downhole muon imaging drilling device sends the measurement data to the surface processing platform.

[0030] The ground processing platform calculates the formation density difference parameters based on the measurement data.

[0031] Compared with the prior art, the first aspect of this invention is that the combined drill pipe can be installed between any adjacent connecting rods according to the geological exploration requirements, so as to adjust the stratigraphic section measured by the muon imaging detector; the second aspect is that the miniaturized muon detector solves the problems of large size, poor temperature and pressure resistance, and vibration interference of the existing muon detector, and can be easily assembled and quickly used in the combined drill pipe according to the measurement requirements. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the combined downhole muon imaging drilling device in this embodiment;

[0034] Figure 2 This is a topological schematic diagram of the combined downhole muon imaging drilling system in this embodiment.

[0035] Figure labels: 100, connecting rod; 110, protective sleeve; 200, first sealing sleeve section; 300, second sealing sleeve section; 400, positioning section; 500, annular encapsulation structure; 600, device section; 700, drill bit. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0037] Please see Figure 1This embodiment provides a combined downhole muon imaging drilling device. The drilling device includes a combined drill pipe. The combined drill pipe includes several connecting rods 100, a measuring section, and a drill bit 700. The several connecting rods 100 are connected sequentially along the axial direction and then connected to the drill bit 700. The measuring section is connected between any two adjacent connecting rods 100. The measuring section is equipped with a muon imaging detector module, which acquires cosmic ray muons that penetrate the formation and determines the formation density difference by attenuating the flux of the cosmic ray muons.

[0038] Furthermore, two adjacent connecting rods 100 are axially connected via a hollow first sealing sleeve section 200. The axial channel between the two adjacent connecting rods 100 is connected through the first sealing sleeve section 200. A sealing sleeve is provided inside the connecting rod 100. When the connecting rod 100 and the first sealing sleeve section 200 are connected, they clamp the ends of the sealing sleeves together at the connection port. There is a heat-insulating protective gap between the sealing sleeve and the inner wall of the connecting rod 100.

[0039] Preferably, the protective cover 110 is made of heat-insulating material.

[0040] The measuring section includes a hollow second sealing sleeve section 300, a positioning section 400, and a device section 600. The axial channels of two adjacent connecting rods 100 are connected through the second sealing sleeve section 300, the positioning section 400, and the device section 600. When the connecting rod 100 is connected to the second sealing sleeve section 300, they clamp the ends of the sealing sleeve at the connection port position. An annular groove is provided on the outer periphery of the device section 600. An annular encapsulation structure 500 is fitted within the annular groove of the device section 600, and the positioning section 400 axially presses the annular encapsulation structure 500 within the device section 600. The muon imaging detector module is integrated into the annular encapsulation structure 500.

[0041] Preferred, Figure 1 The positioning section 400 has an antenna ring axially disposed on the side near the annular encapsulation structure 500, and the antenna ring is pressed between the positioning section 400 and the annular sealing structure. The antenna ring then transmits the signal into the axial channel through antenna cables arranged on the positioning section 400.

[0042] Based on this, the measuring section of the combined drill pipe in this invention can be installed between any adjacent connecting rods 100 according to the geological exploration requirements, so as to adjust the stratigraphic section measured by the muon imaging detector.

[0043] Meanwhile, the muon imaging detector will not affect the relatively stable physical channel formed inside the combined drill pipe at any position. After collecting formation density difference data, the muon imaging detector can transmit the formation density difference data to the ground equipment through the physical channel via signal cable and / or wireless transmission.

[0044] In this embodiment, the annular package structure 500 is made of titanium alloy. An alumina ceramic heat insulation layer is disposed between the annular package structure 500 and the device section 600. A miniaturized muon detector, an anti-vibration photomultiplier tube, and processing circuitry are installed inside the annular package structure 500.

[0045] The miniaturized muon detector uses a high-temperature resistant, high-energy scintillator, such as a barium fluoride (BaF2) crystal, with an aluminum-coated reflective layer (reflectivity ≥95%), a size of Φ4cm×15cm, and a temperature resistance of 200℃. The vibration-resistant photomultiplier tube replaces the traditional photomultiplier tube (PMT) with a silicon photomultiplier tube (SiPM), reducing the size to 2cm×2cm×0.5cm, with a vibration acceleration resistance ≥20g. The vibration-resistant photomultiplier tube can be directly coupled to the rear end of the miniaturized muon detector (11), and it is physically connected to the scintillator (such as a BaF2 crystal) through direct contact via an optical interface to form an optical signal transmission channel. Each scintillator corresponds to a 4×4 SiPM array to form 16 channels of independent signal acquisition, thereby outputting formation density difference data. The processing circuit receives and stores the formation density difference data, and then transmits it to the ground equipment wirelessly along the interior of the combined drill pipe via an antenna ring and antenna cable. Formation density difference data can be either the original muon pulse signal or a digital signal related to the original muon pulse signal after preprocessing by a processing circuit.

[0046] Preferably, the antenna converter and the processing circuit are electrically connected through metal contacts provided in the annular package structure 500.

[0047] Preferably, the annular encapsulation structure 500 is provided with an incident window facing the outside of the measuring section. The incident window is a silicon carbide (SiC) protective sheet to resist mud erosion.

[0048] Furthermore, the muon imaging detector module also includes a vibration-temperature suppression unit integrated within the miniaturized muon detector. This vibration-temperature suppression unit is an active control module integrated inside the miniaturized muon detector, which, through a synergistic design of mechanical and material components, suppresses vibration interference and transient high-temperature shocks during drilling. Specifically, the vibration-temperature suppression unit comprises four sets of piezoelectric ceramic actuators symmetrically arranged on the inner wall of the miniaturized muon detector, vibration sensors, and a processor. The vibration sensors acquire longitudinal vibration signals of the drill string in real time. The processor generates a reverse-phase vibration wave based on the longitudinal vibration signal and outputs it through the piezoelectric ceramic actuators to cancel out the vibration energy.

[0049] Preferably, an attitude sensor is disposed within the annular encapsulation structure 500. The attitude sensor acquires the attitude data of the currently measured segment. The processing circuit receives, stores, and transmits the attitude data to ground equipment via the antenna loop.

[0050] In addition, the annular encapsulation structure 500 can be filled with paraffin-based phase change material (melting point 160°C) to absorb transient high-temperature pulses.

[0051] In some embodiments, the drill bit 700 may be configured with a through hole. The ground equipment achieves reverse mud circulation by applying high-pressure gas into the combined drill pipe, which acts on the mud near the drill bit 700 through the through hole. The protective sleeves 110 inside each connecting rod 100 may be flexible, and the protective sleeves 110 of each connecting rod 100 can mutually balance the high-pressure gas in their respective portions by expanding or contracting.

[0052] In some embodiments, the drill bit 700 is a solid drill bit 700, and the internal channels of the combined drill rod are dedicated to wireless or wired signal transmission.

[0053] Based on this, the miniaturized muon detector in this embodiment solves the problems of large size, poor temperature and pressure resistance, and susceptibility to vibration interference in the existing muon detector. It is suitable for use in combined drill pipes and can be easily assembled and used quickly according to measurement needs.

[0054] Please see Figure 2 This embodiment discloses a combined downhole muon imaging while drilling system. The while drilling device utilizes a combined downhole muon imaging while drilling unit and a surface processing platform. The combined downhole muon imaging while drilling unit transmits the measurement data to the surface processing platform. The surface processing platform calculates and analyzes the formation density difference parameters based on the measurement data.

[0055] Specifically, the ground processing platform preprocesses the raw formation density data to calculate the muon flux decay rate. In the formula, N H0 For the muon count at depth H0 in the well, N GROUND The density difference coefficient Δρ is calculated using the muon flux attenuation rate, which is the baseline measurement value. In the formula, μ is the muon attenuation coefficient, μ≈0.1cm2 / g. The ground processing platform simultaneously counts muons every 10 seconds, performs vibration filtering and background subtraction on the original muon pulse signal to generate the Δρ sequence for that downhole depth.

[0056] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the scope of the technology disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention. All should be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

[0057] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

[0058] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A combined downhole muon imaging drilling device, characterized in that, The drilling equipment includes a combined drill pipe; The combined drill pipe includes at least two connecting rods, a measuring section, and a drill bit; At least two of the connecting rods and the drill bit are connected sequentially along the axial direction; The measuring section is installed between two adjacent connecting rods; The measurement section is equipped with a muon imaging detector module, which is used to analyze formation density difference data.

2. The combined downhole muon imaging drilling device according to claim 1, characterized in that, The muon imaging detector module includes a ring-shaped package structure and a miniaturized muon detector, an anti-vibration photomultiplier tube, and a processing circuit disposed in the ring-shaped package structure. The annular encapsulation structure is embedded on the outer periphery of the measuring section; The miniaturized muon detector is used to generate ultraviolet fluorescence signals based on cosmic muon signals from the Earth's strata. The vibration-resistant photomultiplier tube receives and converts the ultraviolet fluorescence signal into a measurement signal; The processed signal acquires and stores the measured signal.

3. The combined downhole muon imaging drilling device according to claim 2, characterized in that, The muon imaging detector module also includes a vibration-temperature suppression unit integrated into the miniaturized muon detector; The vibration-temperature suppression unit acquires the longitudinal vibration signal of the drill bit and generates a reverse phase vibration wave acting on the miniaturized muon detector based on the longitudinal vibration signal.

4. The combined downhole muon imaging drilling device according to claim 2, characterized in that, The ring-shaped encapsulation structure is made of titanium alloy material; An alumina ceramic heat insulation layer is provided between the annular encapsulation structure and the measuring section. The annular encapsulation structure has an incident window facing the outside of the measuring section, and the incident window is a silicon carbide protective sheet.

5. The combined downhole muon imaging drilling device according to claim 2, characterized in that, An attitude sensor is installed inside the annular encapsulation structure. The attitude sensor collects the attitude data of the current measurement segment; The processing circuit receives and stores the attitude data.

6. The combined downhole muon imaging drilling device according to claim 1, characterized in that, The connecting rod is configured with an axial channel; The two adjacent connecting rods are connected by a first sealing sleeve, and the axial channels of the two adjacent connecting rods are connected through the first sealing sleeve.

7. The combined downhole muon imaging drilling device according to claim 2, characterized in that, The measuring section includes a second sealing sleeve section, a positioning section, and a device section; The axial channels of two adjacent connecting rods are connected through the second sealing sleeve, the positioning section, and the device section; The annular packaging structure is sleeved on the outer periphery of the device section, and the positioning section presses the annular packaging structure against the device section axially.

8. The combined downhole muon imaging drilling device according to claim 7, characterized in that, The positioning section has an antenna ring arranged axially on the side near the annular encapsulation structure, and the antenna ring is pressed between the positioning section and the annular sealing structure.

9. The combined downhole muon imaging drilling device according to claim 8, characterized in that, The antenna ring is connected to the axial channel via an antenna cable arranged in the positioning section.

10. A combined downhole muon imaging while drilling system, characterized in that, The drilling equipment includes the combined downhole muon imaging drilling equipment and surface processing platform as described in any one of claims 1 to 9; The combined downhole muon imaging drilling device sends the measurement data to the surface processing platform. The ground processing platform calculates the formation density difference parameters based on the measurement data.

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