System and method for enhancing gas extraction through drilling slag discharge and hydraulic oscillation fracturing based on nanofluids

A technology of gas drainage and nanofluid, which is applied in the fields of mining fluid, earth drilling, gas discharge, etc., can solve problems such as inability to guarantee efficient gas drainage, insignificant reduction in crack initiation pressure, and poor hydraulic fracturing effect, etc., to achieve Efficient and unobstructed drilling operation, rapid desorption, and good fracture depth

Active Publication Date: 2019-12-17
CHONGQING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of hydraulic fracturing, there are often problems such as high-pressure water is easy to filter out, and the crack initiation pressure of multiple fracturing is not significantly reduced, resulting in poor hydraulic fracturing effect and unable to ensure efficient gas extraction.

Method used

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  • System and method for enhancing gas extraction through drilling slag discharge and hydraulic oscillation fracturing based on nanofluids
  • System and method for enhancing gas extraction through drilling slag discharge and hydraulic oscillation fracturing based on nanofluids
  • System and method for enhancing gas extraction through drilling slag discharge and hydraulic oscillation fracturing based on nanofluids

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]This embodiment discloses a drilling slag discharge and hydraulic oscillating fracturing enhanced gas drainage system based on nanofluid, including a drilling slag discharge device and a hydraulic oscillating fracturing enhanced gas drainage device.

[0040] The drilling slag discharge device includes a drill bit 3, a drill pipe 4, a drilling rig 5, a booster pump I6, a nanofluid storage tank I7, a gas slag separator I8 and a gas extraction pipeline I9.

[0041] see figure 1 , One end of the drill rod 4 is provided with a drill bit 3 , and the other end is provided with a drill rig 5 . see figure 2 , the drill bit 3 is conical, the tip of the drill bit 3 is provided with a high-pressure nozzle 301, and the surface of the drill bit 3 is arranged with several high-pressure nozzles 301 and some serrations 302 at intervals, and several of the serrations 302 are all along the generatrix of the drill bit 3 Arrange evenly. The inside of the drill pipe 4 is provided with a n...

Embodiment 2

[0060] This embodiment discloses a method for using a nanofluid-based drilling slag discharge and hydraulic oscillating fracturing enhanced gas drainage system described in Embodiment 1, including the following steps:

[0061] 1. The gas extraction hole 101 is arranged on the surface of the coal seam 1, and the upper end of the gas slag separator I8 is opened and the airtight cover is arranged around the gas extraction hole 101. Put the hydrophilic nanofluid into the nanofluid storage tank I7, open the valve I10, start the drilling machine 5 to drive the drill pipe 4 and the drill bit 3 to rotate. Start the pressurizing pump I6 to make several high-pressure nozzles 301 in the drill bit 3 spray out high-pressure hydrophilic nanofluid to impact and break the coal rock mass. A circular platform with a hole in the middle is formed in front of the drill bit 3, and several of the saw teeth 302 are used to break the circular platform and drill forward. During the drilling process, t...

Embodiment 3

[0071] This embodiment discloses a drilling slag discharge and hydraulic oscillating fracturing enhanced gas drainage system based on nanofluid, including a drilling slag discharge device and a hydraulic oscillating fracturing enhanced gas drainage device.

[0072] The drilling slag discharge device includes a drill bit 3, a drill pipe 4, a drilling rig 5, a booster pump I6, a nanofluid storage tank I7, a gas slag separator I8 and a gas extraction pipeline I9.

[0073] see figure 1 , One end of the drill rod 4 is provided with a drill bit 3 , and the other end is provided with a drill rig 5 . see figure 2 , the drill bit 3 is conical, the tip of the drill bit 3 is provided with a high-pressure nozzle 301, and the surface of the drill bit 3 is arranged with several high-pressure nozzles 301 and some serrations 302 at intervals, and several of the serrations 302 are all along the generatrix of the drill bit 3 Arrange evenly. The inside of the drill pipe 4 is provided with a ...

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Abstract

The invention discloses a system and method for enhancing gas extraction through drilling slag discharge and hydraulic oscillation fracturing based on nanofluids. A coal rock body and broken rock at the front portion of a drill bit are wetted by the hydrophilic nanofluid in the coal body drilling process, the flowability of the coal rock body is increased, and the slag discharge smoothness in thedrilling process is ensured. Then, the hydrophobic nanofluid is injected into a coal seam to be attached to the surface of the coal body, high-pressure water is prevented from leaking off, the depth of cracks is better increased, and therefore the coal body can be efficiently cracked under the same water injection pressure, the rapid desorption of gas of the coal seam is promoted on a large scale,and the good synergistic effect of the nanofluids and the hydraulic fracturing is realized. The effect of integrating efficient drilling operation, efficient coal seam permeability improvement and efficient gas extraction is realized, the coal seam gas is scientifically and efficiently extracted, and the aim of effectively preventing high gas and low-permeability coal seam gas disasters is realized.

Description

technical field [0001] The invention relates to the technical field of gas drainage, in particular to a nanofluid-based drilling slag discharge and hydraulic vibration fracturing enhanced gas drainage system and method. Background technique [0002] Studies have shown that the increase in my country's energy demand is still dominated by the increase in coal production, and with the rapid increase in the depth of coal mining, the requirements for slag discharge during the drilling process will be higher, and unfavorable slag discharge will lead to nozzle holes and drill sticking , buried drilling and other issues, the construction safety cannot be guaranteed, which seriously affects the construction efficiency. [0003] At the same time, due to the low permeability of deep coal seams, it is difficult to extract gas, and the problem of coal and gas outburst is becoming more and more serious. Therefore, anti-permeability measures such as hydraulic fracturing and hydraulic punch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B33/13E21F7/00E21F17/18
CPCE21B33/13E21B43/26E21F7/00E21F17/18
Inventor 邹全乐程志恒张天诚刘涵周俊豪闫发志李家祺贾雪祺刘彦麟
Owner CHONGQING UNIV
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