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CN-122014160-A - Self-adaptive hole protection device and method for advanced drilling hole wall of crushed soft coal seam

CN122014160ACN 122014160 ACN122014160 ACN 122014160ACN-122014160-A

Abstract

The invention relates to the technical field of underground advanced drilling equipment of coal mines, in particular to a device and a method for self-adapting hole protection of an advanced drilling hole wall of a broken soft coal layer. The technical scheme includes that the device comprises a protection hole main body, wherein the protection hole main body comprises a protection hole shell and a plurality of standardized interfaces fixedly installed on the outer side of the protection hole shell, and the protection hole main body comprises a hole wall pressure monitoring module installed on the outer side of the protection hole shell through the standardized interfaces. The invention adopts a composite structure of flexible guard holes and self-adaptive driving, realizes dynamic matching of guard hole force and hole wall pressure, can adapt to deformation of crushed soft coal seams, forms an omnibearing and tightly attached flexible protective layer, effectively isolates loose fragments and slurry, further solves the problems of hole wall collapse, burial, drill sticking and the like, and ensures continuous development of drilling operation.

Inventors

  • DING LIAN
  • SUN JIE
  • ZHAO XIN
  • XU XIAOTAO
  • Di Shaobo
  • Che Jinao

Assignees

  • 中国煤炭地质总局勘查研究总院
  • 中煤地(北京)地质科学技术研究院有限责任公司

Dates

Publication Date
20260512
Application Date
20260403

Claims (10)

  1. 1. Garrulous soft coal seam advance drilling pore wall self-adaptation hole protection device, including hole protection main part (1), hole protection main part (1) include hole protection shell (101) and many fixed mounting standardized interface (102) in the hole protection shell (101) outside, a serial communication port, include: the pore wall pressure monitoring module (3) is arranged outside the protective pore shell (101) through a standardized interface (102); a detection cooperative module (4) arranged outside the guard hole shell (101) through a standardized interface (102); a power supply module (5) arranged outside the protection hole main body (1); An external hole protection assembly (7) arranged on one side of the hole protection main body (1), wherein the external hole protection assembly (7) comprises a positioning layer (701) arranged on one side of the hole protection shell (101); Install flexible hole protection module (8) in external hole protection subassembly (7) bottom, flexible hole protection module (8) include flexible hole protection wall (801), the inner wall fixed mounting of flexible hole protection wall (801) has buffering cavity (802), the inner wall fixed mounting of buffering cavity (802) has location outer layer frame (807), narrow air layer (808), wide ventilation layer (809) and narrow ventilation layer (812) have been seted up to the inside of location outer layer frame (807), narrow air layer (808), wide ventilation layer (809) are the intercommunication state setting with narrow ventilation layer (812), slidable mounting has thin arc pipe (811) between wide ventilation layer (809) and the narrow ventilation layer (812), thick arc pipe (810) are installed in the outside slidable of thin arc pipe (811), fixed mounting has the arc spring between thick arc pipe (810) and the thin arc pipe (811).
  2. 2. The advanced drilling hole wall self-adaptive hole protection device for the crushed soft coal seam according to claim 1, wherein an early warning control module (6) is installed in the hole protection main body (1), and the early warning control module (6) is communicated with a terminal through an electric signal.
  3. 3. The advanced drilling hole wall adaptive hole protection device for a crushed soft coal seam according to claim 2, wherein the external hole protection assembly (7) further comprises an assembly installation area (705) fixedly installed inside the positioning layer (701), and the assembly installation area (705) comprises a pressure monitoring assembly installation area, a driving control assembly installation area and a power supply assembly installation area.
  4. 4. The advanced drilling hole wall self-adaptive hole protection device for the crushed soft coal layer according to claim 3, wherein a plurality of heat dissipation holes (702) are formed in the surface of the positioning layer (701), and a dust screen is arranged on the surface of the heat dissipation holes (702).
  5. 5. The advanced drilling hole wall self-adaptive hole protection device for the crushed soft coal layer, according to claim 4, characterized in that a detection channel (703) is arranged on the surface of the positioning layer (701), the detection channel (703) is located right below the positioning layer (701), and an air flow filling assembly (706) is arranged inside the positioning layer (701).
  6. 6. The advanced drilling hole wall self-adaptive hole protection device for the crushed soft coal seam according to claim 5, wherein two groups of quick-connection threads (704) are fixedly arranged at the bottom of the flexible hole protection wall (801), one group of quick-connection threads (704) is connected with a drill rod, and the other group of quick-connection threads (704) is connected with a drilling probe.
  7. 7. The adaptive hole protection device for the advanced drilling hole wall of the crushed soft coal seam according to claim 6, wherein the upper end and the lower end of the flexible hole protection wall (801) are fixedly provided with a forward-reverse motor (803), the output ends of one group of forward-reverse motors (803) are fixedly provided with a second threaded rod (805), the output ends of the other group of forward-reverse motors (803) are fixedly provided with a first threaded rod (804), the first threaded rod (804) is rotatably arranged in the second threaded rod (805), the outer sides of the forward-reverse motors (803) are fixedly provided with a fixed clamping frame (813), and the outer sides of the first threaded rod (804) and the second threaded rod (805) are fixedly provided with a second bidirectional hinging rod (814).
  8. 8. The advanced drilling hole wall self-adaptive hole protection device for the crushed soft coal seam according to claim 7, wherein a first bidirectional hinging rod (806) is hinged to the outer side of the fixed clamping frame (813), a second bidirectional hinging rod (814) is hinged to the inner side of the first bidirectional hinging rod (806), one side, away from the fixed clamping frame (813), of the second bidirectional hinging rod (814) is hinged to the outer side of the second bidirectional hinging rod (814), and pushing frames (815) are hinged to the outer sides of the second bidirectional hinging rod (814) and the first bidirectional hinging rod (806).
  9. 9. The advanced drilling hole wall self-adaptive hole protection device for crushed soft coal layers according to claim 8, wherein the pushing frame (815) is attached to the inner wall of the positioning outer frame (807), and the inner diameter of the narrow gas layer (808) is smaller than the inner diameter of the wide circulating layer (809).
  10. 10. The method for self-adapting hole protection of the advanced drilling hole wall of the crushed soft coal layer is applied to the self-adapting hole protection device of the advanced drilling hole wall of the crushed soft coal layer as claimed in claim 9, and is characterized by comprising the following steps: S1, adjusting the adaptation specification of a guard hole main body (1) according to the diameter of an advanced drilling borehole in a target area, ensuring that an external guard hole assembly (7) and a flexible guard hole module (8) smoothly enter the borehole, accurately calibrating a pressure sensor of a hole wall pressure monitoring module (3), and then debugging an adaptive driving module (2), an early warning control module (6) and a detection cooperative module (4) to ensure that the modules work normally; S2, starting a drilling machine to perform drilling and opening, preprocessing the opened slurry with low viscosity and low damage, connecting a debugged external hole protection assembly (7) with a flexible hole protection module (8) through a quick connection screw thread (704) with a drill rod and an advanced detection probe, ensuring firm connection and good sealing, then putting the device, the drill rod and the probe into the drilling hole together, slowly pushing in the putting-in process, and simultaneously monitoring the hole wall pressure in real time through an early warning control module (6) to ensure the stability of the hole wall in the putting-in process; S3, starting the drilling machine to start advanced drilling, enabling the hole protection device to synchronously push along with the drill rod, entering a self-adaptive hole protection state while drilling, and simultaneously carrying out advanced detection operation to realize synchronous hole protection and detection; S4, in the process of protecting the hole while drilling and detecting, if the early warning control module (6) monitors that the hole wall pressure exceeds a preset early warning threshold value or the pressure change rate exceeds a set value, judging the hole wall collapse precursor, immediately starting acousto-optic early warning, and simultaneously sending an early warning signal to a ground control terminal to remind field staff to take treatment measures in time; S5, after the advanced drilling operation is completed, the drill rod is slowly lifted, the external hole protection assembly (7), the flexible hole protection module (8) and the detection probe are recovered from the drilled hole, and after the recovery, the whole device is cleaned, inspected and maintained, and mud and fragments on the surface of the flexible hole protection module (8) are removed.

Description

Self-adaptive hole protection device and method for advanced drilling hole wall of crushed soft coal seam Technical Field The invention relates to the technical field of underground advanced drilling equipment of coal mines, in particular to a device and a method for self-adapting hole protection of an advanced drilling hole wall of a broken soft coal layer. Background The advanced drilling is a core technical means for preventing hidden disaster-causing bodies and guaranteeing safe production in underground coal mines, particularly in the exploitation of crushed soft coal beds, the conditions of a geological structure, hidden danger of water damage and the like in front can be ascertained in advance through the advanced drilling, and scientific basis is provided for the mining operation. However, the broken soft coal layer has the characteristics of poor rock mass cementation, low strength, high porosity and easy softening and disintegration when meeting water, and in the advanced drilling process, the borehole wall is extremely easy to collapse, so that drilling can not be continuously performed, drilling tool blocking and drilling equipment damage can be caused, the operation cost is increased, detection signals are interrupted, data are distorted, front geological information can not be accurately acquired, safety accidents such as water permeation and ledge are even caused in severe cases, and mine safety production is restricted. At present, the hole wall protection technology of underground broken soft coal layer advanced drilling of the coal mine mainly comprises two modes of slurry hole protection and sleeve hole protection, but has obvious limitations, and the technology is as follows: 1. The mud hole protection mode is that mud is injected into a drilled hole to form mud skin, the hole wall is protected by means of the bonding effect of the mud skin, but the broken soft coal layer is high in porosity and strong in permeability, the mud is easy to permeate into a rock stratum, the mud skin cannot form a complete protection layer, the hole protection effect is poor, meanwhile, the drilling signal acquisition element is polluted by the mud, the detection data is distorted, the mud preparation and circulation cost is high, the operation flow is complex, and the real-time hole protection requirement while drilling cannot be adapted. 2. The casing hole protection mode is that a rigid casing is adopted to be put into a drilled hole to realize hole wall protection, but the rigid casing cannot adapt to deformation of a broken soft coal seam, gaps are easily formed between the rigid casing and the hole wall, slurry and loose fragments enter the gaps to cause casing blocking and hole wall collapse, the casing cannot be synchronously pushed along with drilling depth after being put into the hole, the casing is required to be put into the hole in a sectional mode and disassembled in a sectional mode, the operation efficiency is extremely low, drilling resistance is increased, and the casing hole protection method is not suitable for long-distance advanced drilling operation. To sum up, the prior hole wall protection technology and device can not solve the core pain points of 'easy collapse of hole wall, poor hole protection effect, low operation efficiency, hole protection and detection dislocation' in the advanced drilling of broken soft coal layers. Disclosure of Invention The invention aims to solve the problems in the background technology and provides a device and a method for self-adapting hole protection of an advanced drilling hole wall of a crushed soft coal layer. The technical scheme of the invention is that the self-adaptive hole protection device for the advanced drilling hole wall of the crushed soft coal layer comprises a hole protection main body, wherein the hole protection main body comprises a hole protection shell and a plurality of standardized interfaces fixedly arranged on the outer side of the hole protection shell, and the self-adaptive hole protection device comprises: The pore wall pressure monitoring module is arranged at the outer side of the protecting pore shell through a standardized interface; the detection cooperative module is arranged on the outer side of the guard hole shell through a standardized interface; The power supply module is arranged on the outer side of the protection hole main body; the external hole protection assembly is arranged on one side of the hole protection main body and comprises a positioning layer arranged on one side of the hole protection shell; Install the flexible hole protection module in external hole protection subassembly bottom, the flexible hole protection module includes flexible hole protection wall, the inner wall fixed mounting of flexible hole protection wall has the buffering cavity, the inner wall fixed mounting of buffering cavity has the location outer layer frame, narrow air layer, wide circulation layer and narrow circulation la