Salt lake stratum stope fixed-point flow field and brine sampling method

Abstract

The invention discloses a salt lake stratum stope fixed-point flow field and brine sampling method. A rotary suction drill bit, a segmented sampling drill rod and a multifunctional positioning segmented sampler are included. The rotary suction drill bit is of a hollow structure and is fixedly connected with the segmented sampling drill rod through threads; in the drilling state, the drill bit rotates to cut a rock mass, meanwhile, drilling cuttings are pumped out through a negative pressure system, and the system measures the seepage resistance of a point position where the current rotary suction drill bit is located according to the negative pressure value and the drilling depth and evaluates the maximum seepage speed; flow field analysis holes which can be controlled to be opened in the X direction and the Y direction are formed in the segmented sampling drill rod at fixed intervals, and each hole position is provided with a positioning magnetic pin; and the multifunctional positioning sectional sampler is placed on the sectional sampling drill.

Description

Technical Field

[0001] The invention relates to the technical field of geotechnical engineering exploration, in particular to a method for sampling fixed-point flow field and brine in a salt lake stratum mining field. Background Art

[0002] In the process of deep development and efficient utilization of salt lake resources, brine, as its core component, is rich in lithium, potassium and other high-value mineral elements, and has irreplaceable strategic importance to energy supply, chemical industry, glass manufacturing and other fields. Accurately grasping key information such as the composition, flow rate changes and flow distribution of salt lake brine is of decisive significance for accurately evaluating the reserve scale and quality characteristics of salt lake resources and predicting their dynamic change trends.

[0003] However, the current sampling and monitoring methods for salt lake brine are generally limited to the traditional manual operation mode, which is not only inefficient and has a high error rate, but also has significant deficiencies in real-time performance, making it difficult to adapt to the fast-paced and high-precision requirements of modern geological exploration and resource development. In particular, the complex topography and variable water level conditions of salt lakes have greatly restricted the effective application of existing brine extraction technologies and methods, making it particularly difficult to simultaneously achieve the goals of brine sampling and point flow velocity measurement.

[0004] The traditional method of sampling by controlling the drill bit position can obtain brine samples at a specified depth, but its operation is cumbersome and inefficient. It is difficult to effectively ensure the sealing of the layers during the operation and prevent the mixing of brine between different layers. The technical implementation is difficult. In this context, the existing technical system has not been able to successfully integrate the fixed-point sampling and flow field detection functions into the same system to achieve a one-machine-two-effect operation mode, which directly leads to the lack of overall accuracy and reliability of the system, which in turn affects the accuracy of the data analysis results and limits the comprehensive and in-depth evaluation of the geological conditions of the salt lake.

[0005] It is particularly worth mentioning that existing technologies such as "A method for collecting deep underground brine in a salt lake (patent number CN201510984397.7)" use compressed air to push brine to the surface, achieving an energy-saving and efficient sampling process, but still have not solved the technical bottlenecks of multi-point sampling in one borehole and fixed-point flow field monitoring, and it is difficult to meet the urgent needs for comprehensiveness, real-time and accuracy in modern salt lake resource exploration and development.

[0006] In view of the above-mentioned technical bottlenecks and limitations, this patented method came into being, aiming to effectively solve existing technical problems through innovative technical means and improve the comprehensive efficiency of salt lake brine sampling and monitoring. Summary of the invention

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] The present invention provides a method for sampling a fixed-point flow field and brine in a salt lake formation mining field, including a method for sampling a fixed-point flow field and brine in a salt lake formation mining field, including a rotary suction drill bit, a segmented sampling drill rod, and a multifunctional positioning segmented sampler. The rotary suction drill bit is a hollow structure, which is connected and fixed to the segmented sampling drill rod by a thread; in the drilling state, the drill bit rotates to cut the rock mass, and at the same time, the drill cuttings are extracted through a negative pressure system. The system determines the seepage resistance of the current point where the rotary suction drill bit is located according to the negative pressure value and the drilling depth, and evaluates the maximum seepage rate; the segmented sampling drill rod is provided with flow field analysis holes that can be controlled to open in the X and Y directions at fixed intervals, and each hole position is arranged with a positioning magnetic pin; the multifunctional positioning segmented sampler is placed in the segmented sampling drill rod, and the multifunctional positioning segmented sampler has both fixed-point directional tracer bacteria sampling and point flow velocity and direction determination.

[0009] As a preferred technical solution of the present application, the segmented sampling drill rod is composed of a rod body, a flow field analysis hole, a positioning magnetic pin, and an ultrasonic energy focusing opener. The flow field analysis hole is prefabricated in the X and Y directions, and it is composed of a prefabricated opening of the sampling point and a pre-crack sealing membrane. In the initial state, the flow field analysis hole is blocked by the pre-crack sealing membrane. When drilling into the predetermined rock formation, the rotary suction drill bit stops drilling. According to the design requirements, the flow field analysis hole uses the positioning magnetic pin as a positioning reference, and uses the ultrasonic energy focusing opener to break the pre-crack sealing membrane at a fixed point to realize the opening operation of the prefabricated opening of the sampling point.

[0010] As a preferred technical solution of the present application, the multifunctional positioning segmented sampler is composed of a semi-flexible flow rate measurement channel, a brine sampler, a magnetic resistance coil, and an interlayer barrier. After drilling is completed and the prefabricated opening operation of the sampling point is completed, the multifunctional positioning segmented sampler is lowered into the segmented sampling drill pipe. The multifunctional positioning segmented sampler is arranged with a magnetic coil in each segment. Under normal conditions, the magnetic coil has a certain magnetism. During the lowering process, the magnetic coil works to control the magnetic force according to the changes in the surrounding magnetic field, offset the magnetism of the magnetic coil and the magnetic field of the positioning magnetic pin, ensure the lowering operation of the multifunctional positioning segmented sampler, and monitor the magnetic field changes at the same time, thereby cooperating with the positioning magnetic pin to complete the precise point-fixing, positioning, and directional arrangement of the segmented sampler in the segmented sampling drill pipe; after positioning is completed, the magnetic coil returns to normal, and the coil magnetic field cooperates with the magnetic pin to complete the combination of the semi-flexible flow velocity measurement channel and the X and Y flow field analysis holes of the segmented sampling drill pipe; the interlayer barrier is arranged between the flow field analysis holes of different layers of the segmented sampling drill pipe, on the one hand, it plays the function of the internal support of the multifunctional positioning segmented sampler tube, and at the same time blocks the flow field short circuit of the vertically adjacent flow field analysis holes in the segmented sampling drill pipe.

[0011] As a preferred technical solution of the present application, after the multifunctional positioning segmented sampler is arranged in the segmented sampling drill rod, multi-point segmented brine sampling is performed through the brine sampler according to instructions; at the same time, the flow velocity measurement in two plane directions of each point is completed through the semi-flexible flow velocity measurement channel in the X and Y directions, and the two-dimensional surface flow velocity and flow direction calculation is completed.

[0012] A multi-point positioning segmented sampling and dynamic monitoring method under salt lake geological conditions includes the following steps:

[0013] S1, the rotary suction drill bit cuts and drills, and at the same time, the drilling cuttings are extracted through negative pressure. The system determines the seepage resistance of the current rotary suction drill bit according to the negative pressure value and the drilling depth, and estimates the maximum seepage velocity, so as to complete the preliminary data accumulation for the flow velocity analysis of the flow field at different points in the later stage; when drilling to the specified layer, the rotary suction drill bit stops working;

[0014] S2, the flow field analysis hole uses the positioning magnetic pin as a positioning reference, and uses the ultrasonic energy focusing opening device to break the pre-cracked sealing film at a fixed point to realize the prefabricated opening operation of the sampling point;

[0015] S3, the multifunctional positioning segmented sampler uses the positioning magnetic pin as the positioning reference to complete the precise point positioning, positioning and orientation arrangement of the segmented sampler in the segmented sampling drill pipe, and simultaneously complete the arrangement of the interlayer barrier;

[0016] S4, the multifunctional positioning segmented sampler is positioned, the magnetic coil returns to normal, the magnetic field of the coil cooperates with the magnetic pin, and the semi-flexible flow velocity measurement channel is combined with the segmented sampling drill pipe X and Y direction flow field analysis holes;

[0017] S5, according to the design requirements, the multifunctional positioning segmented sampler performs multi-point segmented brine sampling through the brine sampler according to the instructions;

[0018] S6, through the semi-flexible flow velocity measurement channels in the X and Y directions, the flow velocity measurement in two plane directions of each point is completed, and the two-dimensional surface flow velocity and flow direction calculation is completed.

[0019] The beneficial effects of the present invention are:

[0020] The method for sampling brine at a fixed point flow field in a salt lake formation mining field according to the present invention has the following significant beneficial effects: the system realizes multi-point positioning segmented sampling and dynamic monitoring of brine under salt lake geological conditions through the coordinated use of a rotary suction drill bit, a segmented sampling drill rod and a multifunctional positioning segmented sampler. The system has a sophisticated structural design and an efficient operation process, and can accurately obtain brine samples and their flow velocity and direction data, providing reliable data support for in-depth research and resource assessment of salt lake geological conditions. Through the coordinated use of positioning magnetic pins and magnetic coils, the multifunctional positioning segmented sampler can achieve precise point positioning, positioning, and directional arrangement in the segmented sampling drill rod to ensure the accuracy and representativeness of the sampling points. The system according to the present invention integrates sampling and monitoring, reduces the cumbersome steps of sampling and monitoring in traditional methods, and reduces the difficulty and cost of operation. At the same time, through precise fixed-point positioning and flow velocity and direction determination, work efficiency is improved, repetitive work is reduced, and the effect of use is better than that of traditional methods; the present invention has a simple and reasonable structure, a novel design, simple and convenient operation, and high practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0022] In the attached picture:

[0023] Figure 1 It is a structural schematic diagram of a fixed-point flow field and brine sampling method for a salt lake stratum stope of the present invention;

[0024] Figure 2 The invention discloses a multifunctional positioning segmented sampler structure schematic diagram of a fixed-point flow field and brine sampling method in a salt lake stratum mining field.

[0025] In the figure: 1. Rotary suction drill rod; 2. Segmented sampling drill rod; 3. Multifunctional positioning segmented sampler; 2-1. Rod body; 2-2. Flow field analysis hole; 2-3. Positioning magnetic pin; 2-4. Ultrasonic energy focusing opener; 2-2-1. Sampling point prefabricated opening; 2-2-2. Pre-crack sealing film; 3-1. Semi-flexible flow rate measurement channel; 3-2. Brine sampler; 3-3. Magnetic resistance coil; 3-4. Interlayer barrier; 3-5. Pressure sensor. DETAILED DESCRIPTION

[0026] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0027] Example: Figure 1-2As shown, the present invention provides a method for sampling fixed-point flow field and brine in a salt lake formation mining field, comprising a rotary suction drill bit 1, a segmented sampling drill rod 2, and a multifunctional positioning segmented sampler 3. The rotary suction drill bit 1 adopts a hollow structure design and is firmly connected to the segmented sampling drill rod 2 through a precision thread. During the drilling process, the rotary suction drill bit 1 rotates at high speed to cut the rock mass, and effectively extracts the drill cuttings through the built-in negative pressure system. The system accurately calculates the seepage resistance at the current drill bit position and evaluates the maximum seepage velocity by real-time monitoring of the negative pressure value and the drilling depth, providing key data for subsequent analysis.

[0028] Furthermore, the segmented sampling drill rod 2 is provided with multiple groups of flow field analysis holes 2-2 that can be controlled to open in the X and Y directions at regular intervals along the length direction of the drill rod. Each group of flow field analysis holes is composed of a sampling point prefabricated opening 2-2-1 and a pre-crack sealing film 2-2-2, and is initially blocked by the pre-crack sealing film 2-2-2. The pre-crack sealing film 2-2-2 can withstand the negative pressure of the drill cuttings extraction of the segmented sampling drill rod 2 and the external positive pressure during the drilling process.

[0029] Furthermore, a positioning magnetic pin 2 - 3 is arranged on the top, bottom, left and right sides of the flow field analysis hole 2 - 2 , and the positioning magnetic pin is embedded in the rod body 2 - 1 for positioning the subsequent multifunctional positioning segmented sampler 3 .

[0030] Furthermore, the ultrasonic energy focusing opening device 2-4 can be lowered into the segmented sampling drill pipe 2 after drilling is completed, and the internal ultrasonic generator generates high-frequency vibrations, which are converted into ultrasonic energy through a special transducer and transmitted along the focusing system to form a high-intensity ultrasonic beam. When the ultrasonic beam contacts the pre-cracked sealing film 2-2-2, its temperature continues to rise, destroying the structural integrity, causing the pre-cracked sealing film 2-2-2 to separate or break.

[0031] Furthermore, the multifunctional positioning segmented sampler 3 is composed of a semi-flexible velocity measurement channel 3-1, a brine sampler 3-2, a magnetic coil 3-3, and an interlayer barrier 3-4. After drilling, the multifunctional positioning segmented sampler 3 is lowered into the segmented sampling drill pipe 2, and the semi-flexible velocity measurement channel 3-1 is extended by the magnetic coil 3-3 and the positioning magnetic pin 2-3, and the sampling work is carried out under the fixation of the interlayer barrier 3-4.

[0032] Furthermore, the magnetic coil 3-3 is initially not powered on to prevent the multifunctional positioning segmented sampler 3 from being adsorbed to the rod body 2-1 at the wrong position. Combining the basic depth data of the geological radar and the induced current information generated by the positioning magnetic pin, it is determined that the multifunctional positioning segmented sampler 3 has reached the vicinity of the corresponding flow field analysis hole 2-2. At this time, the magnetic coil 3-3 is powered on to be adsorbed to the positioning magnetic pin 2-3.

[0033] A multi-point positioning segmented sampling and dynamic monitoring method under salt lake geological conditions includes the following steps:

[0034] S1, the rotary suction drill bit 1 cuts and drills, and at the same time, the drill cuttings are extracted by negative pressure. The system determines the seepage resistance of the current point where the rotary suction drill bit 1 is located according to the negative pressure value and the drilling depth, and estimates the maximum seepage velocity, so as to complete the preliminary data accumulation for the flow velocity analysis of the flow field at different points in the later stage; when drilling to the specified layer, the rotary suction drill bit 1 stops working;

[0035] S2, the flow field analysis hole 2-2 uses the positioning magnetic pin 2-3 as a positioning reference, and uses the ultrasonic energy focusing opening device 2-4 to break the pre-cracked sealing film 2-2-2 at a fixed point to realize the opening operation of the sampling point prefabricated opening 2-2-1;

[0036] S3, the multifunctional positioning segmented sampler 3 uses the positioning magnetic pin 2-3 as a positioning reference to complete the precise positioning, positioning, and orientation of the segmented sampler 3 in the segmented sampling drill rod 2, and simultaneously completes the arrangement of the interlayer barrier 3-4;

[0037] S4, the multifunctional positioning segmented sampler 3 is positioned, the magnetic coil 3-3 returns to normal, the magnetic field of the coil cooperates with the magnetic pin 2-2, and the semi-flexible flow velocity measurement channel 3-1 is combined with the segmented sampling drill rod 2X, Y direction flow field analysis hole 2-1;

[0038] S5, according to the design requirements, the multifunctional positioning segmented sampler 3 performs multi-point segmented brine sampling through the brine sampler 3-2 according to the instructions;

[0039] S6, through the semi-flexible flow velocity measurement channels in the X and Y directions, the flow velocity measurement in two plane directions of each point is completed, and the two-dimensional surface flow velocity and flow direction calculation is completed.

[0040] Finally, it should be noted that in the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0041] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for sampling a fixed-point flow field and brine in a salt lake formation mining field, comprising a rotary suction drill bit (1), a segmented sampling drill rod (2), and a multifunctional positioning segmented sampler (3), characterized in that: The rotary suction drill bit (1) is a hollow structure, and is connected and fixed to the segmented sampling drill rod (2) through a thread. In the drilling state, the drill bit rotates to cut the rock mass, and the drill cuttings are extracted through the negative pressure system. The system determines the seepage resistance of the current position of the rotary suction drill bit (1) according to the negative pressure value and the drilling depth, and evaluates the maximum seepage rate. The segmented sampling drill rod (2) is provided with flow field analysis holes (2-2) which can be opened in a controlled manner in the X and Y directions at regular intervals, and a positioning magnetic pin (2-3) is arranged at each hole position; The multifunctional positioning segmented sampler (3) is placed in the segmented sampling drill rod (2). The multifunctional positioning segmented sampler (3) is capable of both point-to-point directional tracer bacteria sampling and point flow velocity and direction measurement.

2. A method for sampling fixed-point flow field and brine in a salt lake formation stope according to claim 1, characterized in that: The segmented sampling drill rod (2) is composed of a rod body (2-1), a flow field analysis hole (2-2), a positioning magnetic pin (2-3), and an ultrasonic energy focusing opener (2-4). The flow field analysis hole (2-2) is prefabricated in the X and Y directions and is composed of a sampling point prefabricated opening (2-2-1) and a pre-crack sealing membrane (2-2-2). In the initial state, the flow field analysis hole (2-2) is blocked by the pre-crack sealing membrane (2-2-2). When drilling into a predetermined rock layer, the rotary suction drill bit (1) stops drilling. According to design requirements, the flow field analysis hole (2-2) uses the positioning magnetic pin (2-3) as a positioning reference, and uses the ultrasonic energy focusing opener (2-4) to break the pre-crack sealing membrane (2-2-2) at a fixed point to realize the opening operation of the sampling point prefabricated opening (2-2-1).

3. A method for sampling fixed-point flow field and brine in a salt lake formation stope according to claim 1, characterized in that: The multifunctional positioning segmented sampler (3) is composed of a semi-flexible flow rate measurement channel (3-1), a brine sampler (3-2), a magnetic resistance coil (3-3), an interlayer barrier (3-4), and a pressure sensor (3-5). After drilling is completed and the prefabricated opening (2-2-1) of the sampling point is opened, the multifunctional positioning segmented sampler (3) is lowered into the segmented sampling drill pipe (2). The multifunctional positioning segmented sampler (3) is segmentedly arranged with magnetic resistance coils (3-2). Under normal conditions, the magnetic resistance coils (3-3) have a certain magnetism. During the lowering process, the magnetic resistance coils (3-3) work and control the magnetic resistance force according to the changes in the surrounding magnetic field to offset the inherent magnetism of the magnetic resistance coils (3-3) and the magnetic field of the positioning magnetic pin (2-3), thereby ensuring the lowering operation of the multifunctional positioning segmented sampler (3) and monitoring the changes in the magnetic field at the same time, thereby realizing the connection with the positioning magnetic pin (2 -2) to complete the precise point-fixing, positioning and directional arrangement of the segmented sampler (3) in the segmented sampling drill rod (2); after the positioning is completed, the magnetic coil (3-3) returns to normal, and the coil magnetic field cooperates with the positioning magnetic pin (2-2) to complete the combination of the semi-flexible flow velocity measurement channel (3-1) and the X and Y direction flow field analysis holes (2-1) of the segmented sampling drill rod (2); the interlayer barrier (3-4) is arranged between the flow field analysis holes (2-1) of different layers of the segmented sampling drill rod (2), on the one hand, it plays the function of a multifunctional positioning segmented sampler (3) tube bracket, and at the same time blocks the flow field short circuit of the vertically adjacent flow field analysis holes (2-1) in the segmented sampling drill rod (2); the pressure sensor (3-5) is arranged in the semi-flexible flow velocity measurement channel (3-1), and combines the channel physical parameters and converts the pressure data into flow velocity data based on the Bernoulli principle.

4. A method for sampling fixed-point flow field and brine in a salt lake formation stope according to claim 1, characterized in that: After the multifunctional positioning segmented sampler (3) is arranged in the segmented sampling drill rod (2), multi-point segmented brine sampling is performed through the brine sampler (3-2) according to instructions; at the same time, the flow velocity measurement in two plane directions of each point is completed through the semi-flexible flow velocity measurement channel in the X and Y directions, and the two-dimensional surface flow velocity and flow direction calculation is completed.

5. A multi-point positioning segmented sampling and dynamic monitoring method under salt lake geological conditions, using the multi-point positioning segmented sampling and dynamic monitoring system under salt lake geological conditions according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1, the rotary suction drill bit (1) cuts and drills, and at the same time, the drill cuttings are extracted by negative pressure. The system determines the seepage resistance of the current position of the rotary suction drill bit (1) according to the negative pressure value and the drilling depth, and estimates the maximum seepage velocity, so as to complete the preliminary data accumulation for the flow velocity analysis of the flow field at different points in the later stage; when drilling to the specified layer, the rotary suction drill bit (1) stops working; S2, the flow field analysis hole (2-2) uses the positioning magnetic pin (2-3) as a positioning reference, and uses the ultrasonic energy focusing opening device (2-4) to break the pre-cracked sealing film (2-2-2) at a fixed point to realize the opening operation of the sampling point prefabricated opening (2-2-1); S3, the multifunctional positioning segmented sampler (3) uses the positioning magnetic pin (2-3) as a positioning reference to complete the accurate point positioning, positioning and orientation arrangement of the segmented sampler (3) in the segmented sampling drill rod (2), and simultaneously completes the arrangement of the interlayer barrier (3-4); S4, the multifunctional positioning segmented sampler (3) is positioned, the magnetic coil (3-3) returns to normal, the magnetic field of the coil cooperates with the magnetic pin (2-2), and the semi-flexible flow velocity measurement channel (3-1) and the X and Y direction flow field analysis holes (2-1) of the segmented sampling drill rod (2) are combined; S5, according to the design requirements, the multifunctional positioning segmented sampler (3) performs multi-point segmented brine sampling through the brine sampler (3-2) according to the instructions; S6, through the semi-flexible flow velocity measurement channels in the X and Y directions, the flow velocity measurement in two plane directions of each point is completed, and the two-dimensional surface flow velocity and flow direction calculation is completed.

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