Carbon dioxide phase change coal seam fracturing device and utilization method

[0022] Example one

[0023] See figure 1 , figure 2 , A carbon dioxide phase change coal seam fracturing device, comprising a cylinder 15 threadedly connected to a valve body 5, characterized in that the two ends of the cylinder 15 are threadedly connected with a connector 2 with a vent 3, and the connector 2 has a cable routing In the hole 4, a cable groove 18 for placing the cable 1 is opened on one side of the cylinder 15 and the two connecting heads 2.

[0024] Among them: a cut piece 17 is placed at one end of the cylinder 15 in contact with a connector 2, the valve body 5 is provided with a terminal 6, a filling port 7, and a filling switch 71, and the valve body 5 is also placed on the cylinder 15. In the heating device 14, a copper gasket 16 is also placed at the contact part of one end of the cylinder 15 and a connector 2.

[0025] Example two

[0026] See figure 1 , figure 2 , A carbon dioxide phase change coal seam fracturing device, comprising a cylinder 15 threadedly connected to a valve body 5, characterized in that the two ends of the cylinder 15 are threadedly connected with a connector 2 with a vent 3, and the connector 2 has a cable routing In the hole 4, a cable groove 18 for placing the cable 1 is opened on one side of the cylinder 15 and the two connectors 2.

[0027] Among them: a cut piece 17 is placed at one end of the cylinder 15 in contact with a connector 2, the valve body 5 is provided with a terminal 6, a filling port 7, and a filling switch 71, and the valve body 5 is also placed on the cylinder 15. In the heating device 14, a copper gasket 16 is also placed at the contact part of one end of the cylinder 15 and a connector 2.

[0028] Among them: the cable duct 18 where the cable 1 is placed is sealed with resin material, and the cable connecting plugs 12 are placed in the ducts 18 at both ends of the cylinder 15 and sealed with tape.

[0029] A method for using a carbon dioxide phase change coal seam fracturing device includes screwing one end of a cylinder 15 on the valve body 5, and placing a copper gasket 16 and a shearing piece 17 in the contact part of the other end of the cylinder 15 on the valve body 5. Tighten, turn on the filling switch 71, fill the filling port 7 with liquid carbon dioxide, turn off the filling switch 71, screw the connector 2 at the end of the valve body 5 to the cylinder 15, the characteristics are: ① Wire the cable Connect the cable 1 to the terminal 6 through the hole 4, connect the cable 1 with the cable connection plug 12, seal the cable trough 18 with tape, and seal the remaining cable trough 18 where the cable 1 is placed with resin material. A carbon dioxide phase change coal seam fracturing device is formed. ② Drill a coal seam fracturing hole in the coal seam, insert one end of a carbon dioxide phase change coal seam fracturing device into the borehole, and screw the other end to connect another carbon dioxide phase change coal seam fracturing device , Connect the cable 1 through the cable connection plug 12 and seal part of the cable trough 18 with tape, use a drill to rotate or push straight into the hole, and then screw the next carbon dioxide phase change coal seam cracker, and then connect it through the cable The plug 12 is connected to the cable 1 and part of the cable trough 18 is sealed with tape, and the drill is rotated or pushed directly into the borehole. Repeat this operation, and the number of carbon dioxide phase change coal seam crackers inserted into the borehole meets the requirements of the coal seam fracturing project Stop this operation when the electric cable 1 is connected to activate the heating device 14 to make the liquid carbon dioxide phase into a high-pressure gas so that the shearing piece 17 is cut off, and the high-pressure gas is ejected from the vent 3 to fracture coal.

[0030] Example three

[0031] See image 3 , Figure 4 , Figure 5 , A carbon dioxide phase change coal seam cracker, comprising a cylinder 15 threaded at one end of the valve body 5, the other end of the cylinder 15 is threaded to connect the connector 2, the valve body 5 has a filling port 7, a filling switch 71, placed in The heating device in the cylinder 15 is characterized in that: the valve body 5 is also provided with a connecting pin hole 117, the electrode upper end 103 of one cable 1, the cylinder 15 is used as the electrode terminal 101 of the other cable, and the connector 2 has There are connecting pin holes 117, the electrode lower end 23 of the cable 1 and the cable connecting terminal 27 and the venting hole 3, and the contact part of the barrel 15 threadedly connected to the connector 2 is provided with a metal cut piece 17 for connecting the cable 1.

[0032] Among them: the metal shear sheet 17 uses a sealed insulating sleeve 118 as a sealing gasket. The metal shear sheet 17 is provided with electrode contacts 119 connected to the cable 1 on both sides. The lower electrode 23, the cable connection terminal 27 and the upper electrode 103 are placed The insulating ring sleeve is provided with a cable connection plug 12 for the cable in the cylinder 15.