Impact of internal parameters on the fracturing performance of 38mm CO2 fracturing tool

doi:10.16265/j.cnki.issn1003-3033.2024.09.1378

Abstract

Abstract:

In order to swiftly elucidate the influence of internal parameters on the fracturing performance of a liquid CO₂ fracturing tool and optimize its functionality for enhanced coal seam gas extraction efficiency, a rapid assessment experimental apparatus was designed. A set of 9 orthogonal experiments involving 4 horizontal and 3 influencing factors was conducted utilizing a 38 mm mining-specific fracturing tool. The study analyzed the relative significance of the internal charge quantity in the heating tube, liquid CO₂ filling volume in the main pipe, the thickness of the fracture plate, and the caliber of the release aperture on the fracturing tool's performance. Furthermore, pivotal influencing factors were subjected to fixed-variable experiments to explore their impact patterns on the fracturing performance of the liquid CO₂ fracturing tool. Results indicate that, for the 38 mm mining-specific CO₂ fracturing tool, the thickness of the fracture plate exerts the most substantial influence on the fracturing tool's performance, followed by the internal charge quantity in the heating tube. The impact of the liquid CO₂ filling volume in the main pipe and the caliber of the release aperture is comparatively weaker. The fracturing performance of the liquid CO₂ fracturing tool gradually stabilizes with an increase in the thickness of the fracture plate, reaching a point where the plate does not rupture. When the internal parameters of the 38 mm fracturing tool are set to a CO₂ mass of 0.33 kg, a release caliber of 18 mm, a charge quantity of 60 g, and a fracture plate thickness of 2.0 mm, the tool's fracturing performance corresponds to a TNT(Trinitrotoluene) equivalent of 0.202 kg which is enhanced by 21.9 % compared to the current on-site parameters.

Key words: CO₂ fracturing tool, internal parameters, capacity to do work, liquid CO₂ filling volume, internal charge quantity in heating tube, thickness of fracture plate, caliber of release aperture

CLC Number:

X924.2安全监测技术与设备

LU Zhaijun, WANG Zhifu, YAO Shujian, ZHONG Mu, SHI Xiangshi, CHEN Feipeng. Impact of internal parameters on the fracturing performance of 38mm CO₂ fracturing tool[J]. China Safety Science Journal, 2024, 34(9): 78-86.

Figures/Tables 16

Fig.1

Fig.2

Table 1

Parameters of Feng equation

c₁	0.376 194	c₁₅	-2.794 98
c₂	0.118 836	c₁₆	5.623 93
c₃	-3.043 79	c₁₇	-2.938 31
c₄	2.274 53	c₁₈	0.988 759
c₅	-1.238 63	c₁₉	-3.047 11
c₆	0.250 442	c₂₀	2.323 16
c₇	-0.115 350	c₂₁	1.073 79
c₈	0.675 104	c₂₂	-0.000 059 972 4
c₉	0.198 861	c₂₃	0.000 088 533 9
c₁₀	0.216 124	c₂₄	0.003 164 18
c₁₁	-0.583 148	c₂₅	10
c₁₂	0.011 974 7	c₂₆	50
c₁₃	0.053 727 8	c₂₇	800 00
c₁₄	0.026 521 6	—	—
b₂		$c 1 + c 2 T' + c 3 T' 2 + c 4 T' 3 + c 5 T' 4 + c 6 T' 5$
b₃		$c 7 + c 8 T' + c 9 T' 2$
b₄		$c 10 + c 11 T'$
b₅		$c 12 + c 13 T'$
b₆		$c 14 T'$
b₇		$c 15 T' 3 + c 16 T' 4 + c 17 T' 5$
b₈		$c 18 T' 3 + c 19 T' 4 + c 20 T' 5$

Table 1

Table 2

Fig.3

Table 3

Table 4

Table 5

Table 6

Fig.4

Table 6

Fig.5

Table 8

Fig.6

Fig.7

Fig.8

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试验号	泄能片厚度	CO₂ 质量	释放口径	装药量	CO₂内能/kJ
1	水平1	水平1	水平1	水平1	176.14
2	水平1	水平2	水平2	水平2	183.02
3	水平1	水平3	水平3	水平3	196.70
4	水平2	水平1	水平2	水平3	225.12
5	水平2	水平2	水平3	水平1	188.79
6	水平2	水平3	水平1	水平2	201.29
7	水平3	水平1	水平3	水平2	218.07
8	水平3	水平2	水平1	水平3	238.24
9	水平3	水平3	水平2	水平1	198.87

变量	泄能片厚度	CO₂质量	释放口径	装药量
K₁	555.86	619.33	617.67	563.8
K₂	615.2	612.05	607.01	602.38
K₃	657.18	596.86	603.56	662.06
k₁	185.29	206.44	205.89	187.93
k₂	205.07	204.02	202.34	200.79
k₃	219.06	198.95	201.19	220.69
R	33.11	7.49	4.04	32.09

方差来源	离差平方和	自由度	均方	F值	P值
泄能片厚度	1 664.90	2.00	832.45	64.16	0.015
CO₂质量	85.00	2.00	42.50	3.28	0.233
释放口径	25.95	2.00	12.98	1	0.5
装药量	1 564.60	2.00	782.30	60.29	0.016

Impact of internal parameters on the fracturing performance of 38mm CO₂ fracturing tool

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试验号	泄能片厚度/mm	CO₂质量/ kg	释放口径/mm	装药量/ g
1	1.0	0.33	18	40
2	1.0	0.36	20	50
3	1.0	0.39	22	60
4	1.5	0.33	20	60
5	1.5	0.36	22	40
6	1.5	0.39	18	50
7	2.0	0.33	22	50
8	2.0	0.36	18	60
9	2.0	0.39	20	40

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