A deep precise point sampling and pressure measuring integrated method and device

Abstract

The present application relates to a kind of deep precision spot sampling and integrated device of pressure measurement, belong to coal seam gas field, including drilling machine, hollow hole drill rod, hollow drill bit, the hollow hole drill rod is detachably equipped with screw sampler;The screw sampler is slidably connected with hollow hole drill rod;The output connector of the drilling machine is divided into two parts, the inside of connector is connected with screw sampler, and the outside of connector is connected with hollow hole drill rod;The rotational speed of the two parts of connector is different;The hollow drill bit is hollow in the inside of hollow hole drill rod, and the drill rod wall of hollow hole drill rod is equipped with hollow hole.

Description

Technical Field

[0001] This invention belongs to the field of coalbed methane and relates to a method and device for deep, precise, fixed-point sampling and pressure measurement. Background Technology

[0002] In high-risk underground mining activities such as high-gas and coal and gas outburst mines, determining the gas content and gas pressure of deep coal samples is a necessary prerequisite for regional prediction and assessment, as well as for verifying the effectiveness of control measures. Various deep sampling methods exist, and the fitting calculation of the gas content analysis of the sampled coal is an important indicator of whether the coal body is in a dangerous area. However, in current practice, there are basically two methods for deep sampling: one is to use a drill rod to reach the predetermined area, then remove the drill rod and install a sampling drill bit. This method is complex, time-consuming, and labor-intensive. The other method uses a double-layer drill rod to reach the predetermined area and uses compressed air to blow out coal dust with strong winds. This method typically yields coal samples with small diameter particles, and the exposed free surface of these smaller particles is relatively large. Using strong winds cannot guarantee that the coal sample is in a naturally disintegrated state after the coal body is broken up (the influence of air pressure on natural disintegration when the coal sample is in a relatively fragmented state). In reality, the natural analysis of coal samples in the early stages is affected, which has a certain impact on the numerical fitting calculation results of the gas content of coal samples in the later stages (especially the values ​​at the critical value edge), and thus affects the accurate prediction of coal body hazard. Summary of the Invention

[0003] In view of this, the purpose of this invention is to provide an integrated method and apparatus for deep fixed-point sampling and pressure measurement of coal samples under natural resorption conditions, and to realize the deep fixed-point sampling and pressure measurement method on a multi-functional drill pipe. This invention ensures that deep coal samples are under natural resorption conditions after coal body destruction, thereby guaranteeing the accuracy of coal sample gas content determination and the accuracy of precise fitting calculation of coal sample gas content. Furthermore, it provides accurate characterization for coal seams whose hazard index (gas content) is on the verge of critical values. By performing pressure measurement simultaneously with sampling, the pressure measurement cycle is significantly shortened.

[0004] To achieve the above objectives, the present invention provides the following technical solution: On one hand, the present invention provides an integrated device for deep precision fixed-point sampling and pressure measurement, including a drilling rig, a hollow drill rod with holes, and a hollow drill bit. The hollow drill rod with holes is equipped with a detachable threaded sampler. The threaded sampler is slidably connected to the hollow drill rod with holes. The output connector of the drilling rig is divided into inner and outer parts. The inner part of the connector is connected to the threaded sampler, and the outer part of the connector is connected to the hollow drill rod with holes. The inner and outer parts of the connector rotate at different speeds. The hollow drill bit and the hollow drill rod with holes are hollow inside, and the drill rod wall of the hollow drill rod with holes is provided with hollow holes.

[0005] Furthermore, the drill rig joint is internally connected to the threaded sampler using a snap-fit ​​method, and externally connected to the hollow drill rod with holes using a movable pin connection method.

[0006] Furthermore, the hollow drill rods with holes are extended by connecting each pair of hollow drill rods with holes and by connecting each threaded sampler with threaded samplers.

[0007] On the other hand, the present invention provides an integrated method for deep, precise, pinpoint sampling and pressure measurement, comprising the following steps: S1: The hollow drill bit is brought into the borehole through the hollow drill rod with holes to reach the predetermined sampling location; S2: Remove the pin between the outside of the drill joint and the hollow drill rod with holes, rotate the inside of the drill joint independently, and use the threaded sampler to remove the coal slag in the air tube; S3: Connect the hollow drill rod with holes to the outside of the joint with a pin. Both the inside and outside of the drill joint rotate. While the hollow drill rod with holes is excavating, samples are taken through a thread sampler. S4: After sampling is completed, remove the pin between the outside of the drill joint and the hollow drill rod with holes, rotate the inside of the drill joint again, and use the threaded sampler to remove the coal slag in the hollow tube. Finally, remove the threaded sampler. S5: Insert the pressure testing tube into the hollow perforated drill rod, set a sealing section inside the hollow perforated drill rod, and seal both ends of the sealing section with bagged polyurethane. After the foamed sealing bag expands and solidifies, open the grouting valve and grout the drill section between the two polyurethane sealing sections through the grouting pipe. Under the action of grouting pressure, the grout penetrates into the hollow hole on the wall of the hollow perforated drill rod and fills the cracks around the drill hole. Then, use the hollow hole at the end of the pressure testing tube as the pressure testing hole and use the pressure gauge at the tail of the pressure testing tube to measure the pressure.

[0008] Furthermore, the step of removing coal slag from the space pipe using a threaded sampler specifically includes: The drill joint internally drives the threaded sampler to rotate at a speed of one revolution per second, so that the coal slag in the grid tube reaches the end of the hollow drill rod with holes along the threaded passage and is poured out from the hollow hole.

[0009] The beneficial effects of this invention are as follows: This invention enables a single drill pipe to serve multiple purposes, providing deep-level fixed-point sampling and gas pressure measurement. This multi-functional drill pipe reduces the risks of downhole construction and improves utilization efficiency. This patented invention ensures that the coal sample is not affected by compressed air during deep-level fixed-point sampling (the coal sample remains in a natural desorption state). After sampling, the external drill pipe position is kept unchanged, and the threaded sampler is used to remove coal slag from the pipe. Finally, the threaded sampler is removed from the pipe. A pressure measuring tube is installed inside the pipe, and deep sealing is performed simultaneously. A two-plug-one-injection technique allows slurry to pass through the hollow hole of the drill pipe to plug the cracks around the coal wall, achieving the sealing purpose and ensuring the accuracy of pressure measurement.

[0010] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0011] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein: Figure 1 This is a plan view of a hollow drill bit; Figure 2 This is a cross-sectional view of a hollow drill rod with holes. Figure 3 This is a cross-sectional view of the drill pipe internal thread sampler; Figure 4 This is a schematic diagram of the pressure testing tube and the two plugs and one injection point. Figure 5 This is a schematic diagram of the drill pipe end connection. Figure 6 Figures (a)-(c) are flowcharts of the sampling and pressure measurement methods.

[0012] Figure reference numerals: 1. Hollow drill bit; 2. Hollow drill rod with holes; 3. Hollow hole; 31. Pressure measuring hole; 32. Grouting hole; 33. Slag discharge hole; 4. Threaded sampler; 5. Grouting valve; 6. Grouting pipe; 7. Pressure measuring pipe; 8. Pressure gauge; 9. First pneumatic drill; 10. Second pneumatic drill; 11. Coal sample container. Detailed Implementation

[0013] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0014] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0015] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the 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, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0016] like Figure 1-6 As shown, on one hand, the present invention provides an integrated device for deep precision fixed-point sampling and pressure measurement, including a drilling rig, a hollow drill rod 2 with holes, and a hollow drill bit 1. The hollow drill rod 2 with holes is equipped with a detachable threaded sampler; the threaded sampler is slidably connected to the hollow drill rod 2 with holes; the output connector of the drilling rig is divided into inner and outer parts, the inner part of which is connected to the threaded sampler, and the outer part of which is connected to the hollow drill rod 2 with holes; the inner and outer parts of the connector rotate at different speeds; the hollow drill bit 1 and the hollow drill rod 2 with holes... The drill rod 2 with perforations is hollow inside, and its wall has hollow holes 3. These holes 3 serve multiple purposes: pressure testing holes 31, slurry dispersing holes 32, and slag discharge holes 33. The hollow holes 3 at the bottom of the drill rod 2 serve as pressure testing holes 31 for pressure measurement of the borehole; the hollow holes 3 in the grouting section serve as slurry dispersing holes 32, allowing slurry to fill the coal seam fractures and ensuring borehole sealing quality; and the hollow holes 3 at the ends of the drill rod 2 serve as slag discharge holes 33, discharging coal dust. The drill rig joint internally connects to the threaded sampler using a snap-fit ​​method, while externally it connects to the hollow drill rod 2 using a movable pin connection. Each pair of hollow drill rods 2 and threaded samplers is extended via threaded connections.

[0017] This invention provides a method for deep fixed-point sampling of coal samples under natural desorption conditions, which is mainly accomplished by the following apparatus and steps.

[0018] The hollow drill bit 1, while rotating the coal body, can simultaneously deliver broken coal dust into the drill rod. The hollow drill rod 2, with an embedded threaded sampler 4, is detachable and connected to the next section via threads. The threaded sampler inside the drill rod, driven by the drilling rig, transports the coal sample from the drill bit to the end. As the coal dust passes through the hollow hole 3 at the end of the drill rod, the coal sample falls into the sample container 11. Upon reaching the designated sampling location, the threaded sampler 4 first rotates to empty the coal dust (rotation speed 1s / revolution). Sampling then begins with simultaneous rotation of the inner and outer drill rods (threaded sampler 4 at 2s / revolution) (speed adjustable). The outer drill rod advances at a uniform speed of 0.5m / min.

[0019] The matching drill rig connector is divided into inner and outer parts. The inner part uses a standard drill rod clamping connection, while the outer drill rod uses a movable pin connection. After the movable pin is removed, the drill rig only drives the internal thread to remove slag, and the slag is removed during the connection process. Different drilling speeds can be selected for both the inner and outer parts to drill simultaneously.

[0020] like Figure 6 As shown in (a)-(c), after arriving at the designated sampling location, 1. Remove the pin and use a drilling rig (the first pneumatic drill 9 used to rotate the threaded sampler 4 rotates independently, while the second pneumatic drill 10 used to rotate the drill rod does not rotate) to remove the coal slag inside the air-hole pipe; 2. Connect the external drill rod with the pin and use the drilling rig to excavate while sampling simultaneously. After sampling is completed, 3. Remove the pin, use the drilling rig to empty the coal slag, and remove the internal thread; 4. Use polyurethane deep sealing, a two-plug-one-injection technique, to measure the gas pressure, specifically including: extending the pressure measuring tube 7... A hollow perforated drill rod 2 is inserted into the drill rod. A sealing section is set inside the drill rod 2, and both ends of the sealing section are sealed with polyurethane bags. After the foamed sealing bags expand and solidify, the grouting valve 5 is opened, and grout is injected into the drill section between the polyurethane sealing sections at both ends through the grouting pipe 6. Under the grouting pressure, the grout permeates out of the hollow holes 3 on the wall of the hollow perforated drill rod 2 and fills the cracks around the drill hole. Then, the hollow hole 3 at the end of the pressure measuring pipe 7 is used as the pressure measuring hole 31, and the pressure is measured using the pressure gauge 8 at the tail of the pressure measuring pipe 7. After the measurement is completed, the drill rod is removed by the drilling rig and prepared for the next use.

[0021] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for integrated deep precision sampling and pressure measurement, characterized in that: Based on the integrated device for deep precision fixed-point sampling and pressure measurement, the device includes a drilling rig, a hollow drill rod with holes, and a hollow drill bit. The hollow drill rod with holes is equipped with a detachable threaded sampler; the threaded sampler is slidably connected to the hollow drill rod with holes. The output connector of the drilling rig is divided into inner and outer parts; the inner part of the output connector connects to the threaded sampler, and the outer part connects to the hollow drill rod with holes. The inner and outer parts of the output connector rotate at different speeds. The hollow drill bit and the hollow drill rod with holes are hollow inside, and the drill rod wall of the hollow drill rod has hollow holes. The inner part of the output connector is connected to the threaded sampler using a snap-fit ​​method, and the outer part of the output connector is connected to the hollow drill rod with holes using a movable pin connection method. Each pair of hollow drill rods with holes and each pair of threaded samplers are extended by threaded connections. The method includes the following steps: S1: The hollow drill bit is brought into the borehole through the hollow drill rod with holes to reach the predetermined sampling location; S2: Remove the pin between the outside of the output connector and the hollow drill rod with holes, rotate the inside of the output connector independently, and use the threaded sampler to discharge the coal slag in the air tube; S3: Connect the hollow drill rod with holes to the outside of the output connector with a pin. The output connector rotates both inside and outside. While the hollow drill rod is excavating, samples are taken through the thread sampler. S4: After sampling is completed, remove the pin between the outside of the output connector and the hollow drill rod with holes, rotate the inside of the output connector separately again, and use the threaded sampler to discharge the coal slag in the air tube. Finally, remove the threaded sampler. S5: Insert the pressure testing tube into the hollow perforated drill rod, set a sealing section inside the hollow perforated drill rod, and seal both ends of the sealing section with bagged polyurethane. After the foamed sealing bag expands and solidifies, grout the drill section between the two polyurethane sealing sections through the grouting pipe. Under the action of grouting pressure, the grout penetrates into the hollow hole on the wall of the hollow perforated drill rod and fills the cracks around the drill hole. Then, use the hollow hole at the end of the pressure testing tube as the pressure testing hole and use the pressure gauge at the tail of the pressure testing tube to measure the pressure. The process of removing coal slag from the space pipe using a threaded sampler specifically includes: The output connector drives the threaded sampler to rotate at a speed of one revolution per second, so that the coal slag in the grid tube reaches the end of the hollow drill rod with holes along the threaded passage and is poured out from the hollow hole.

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