Directional fracturing device and method for underground drilling

A directional fracturing and fracturing technology, which is applied in the field of mine rock formation pressure, can solve problems such as non-adjustable, prone to deviation of pressure valve direction, and unobservable pressure valve position, so as to improve the accuracy of fracturing, improve the scope of application, and apply wide range of effects

Active Publication Date: 2019-10-18
CHINA UNIV OF MINING & TECH
View PDF8 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in actual operation, there are still the following problems: due to the long borehole, which can reach hundreds of meters or even kilometers, after the connection of multi-section rigid fracturing pipes, the direction of the pressure valve on the first section is prone to deviation, while the rigid fracturing pipe It is sent into the rigid casing and cannot be adjusted, and the position of the pressure valve cannot be observed, so that the direction of constant pressure fracturing is uncontrollable; not only that, the installation of the one-way valve takes up a lot of space, and it is difficult to change the direction in the narrow borehole. It can only achieve segmental fracturing of long drilling holes, and cannot realize directional fracturing such as linear directional expansion, fan-shaped directional expansion, and cross-shaped directional expansion according to the original rock stress and gas distribution of the rock formation, so that the pressure effect cannot reach the ideal state

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Directional fracturing device and method for underground drilling
  • Directional fracturing device and method for underground drilling
  • Directional fracturing device and method for underground drilling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Such as figure 1 As shown, when drilling 1 fan-shaped directional fracturing in the bottom plate of the coal seam 14 underground in a coal mine, the fracturing target area 17 is first determined according to the gas content, gas pressure, in-situ stress and mining impact of the coal seam 14 . According to the fracturing target area 17, select a suitable roadway that is closer to the target area, and construct a fracturing drilling site in Xiangbang, place the kilometer drilling rig, drill pipe, casing 2, and fracturing pipe 3 near the working area, and complete Preparations before fracturing.

[0073] The fracturing goal of this embodiment is to release the pressure and extract the target area through floor fracturing, so it is required that the fracturing fractures can develop to the target area, and at the same time be distributed fan-shaped throughout the entire fracturing target area 17 . Therefore, it is determined that this construction is fan-shaped directional ...

Embodiment 2

[0078] Such as figure 2 As shown, when performing linear directional fracturing in the coal seam 14 borehole 1 underground in a coal mine, the fracturing target area 17 is firstly determined according to the gas content, gas pressure, in-situ stress and mining impact of the coal seam 14 . Then, according to the fracturing target area 17, select the bottom pumping roadway or the excavation drilling site closest to the target area to arrange the workbench, place the tunnel drilling rig, drill pipe, casing 2, and fracturing pipe 3 near the working area, and complete the fracturing construction preparatory work.

[0079] The fracturing goal of this embodiment is to perform linear directional fracturing on the coal seam 14 to relieve pressure and increase permeability, so the cracks are required to develop along the coal seam 14 as much as possible. Therefore, it is determined that cross directional fracturing is selected for this construction. According to the needs of the cros...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a directional fracturing device and method for underground drilling. The device comprises a plurality of sections of casing pipes and fracturing pipes which are connected end to end, wherein the casing pipes are provided with directional fracturing control devices, and each directional fracturing control device comprises a screw hole with an adjustable angle and a one-way destructive conical screw matched with the screw hole; and the casing pipes are connected through stroke-controllable threaded connection assemblies or flange connection assemblies, and alignment scribed lines corresponding to the positions of the directional fracturing control devices in the circumferential direction are arranged on the casing pipes, so that the alignment scribed lines and the directional fracturing devices are always aligned. The method is mainly characterized in that after a hole is drilled in a roadway, the casing pipes are sent into the drilled hole, and the annular spacebetween the casing pipes and the drilled hole is sealed by grouting; and fracturing pipes provided with front packers and rear packers are sent into the casing pipes, and after entering the casing pipes from the fracturing pipes, the pressurized fluid flushes the casing pipes to fracture the coal rock mass when the pressure reaches the maximum bearing pressure of the directional fracturing controldevices. According to the directional fracturing device and method for underground drilling, provided by the invention, the fracturing direction is controllable, and various directional expansion forms can be realized.

Description

technical field [0001] The invention relates to an underground drilling directional fracturing device and method, belonging to the technical field of mine rock formation pressure. Background technique [0002] The geological occurrence conditions of coal seams in my country are complex and changeable, and the coal-rock dynamic disaster accidents caused by gas or gas as an inducing factor pose serious challenges to the safe and green mining of coal in my country. In order to solve this problem, experts at home and abroad have proposed pressure-relief and anti-reflection drainage for the gas-bearing coal seam and its roof and floor. [0003] For pressure relief and drainage of coal seams in high-gas mines, a variety of hydraulic measures have been taken in the industry, including: hydraulic punching, hydraulic slotting, hydraulic cavitation and hydraulic fracturing. Among them, hydraulic fracturing is widely used because of its advantages such as large pressure relief range, ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21F7/00
CPCE21B43/26E21F7/00
Inventor 王恩元李楠孙炜辰
Owner CHINA UNIV OF MINING & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap