Deep shale gas drilling and exploiting method and fracturing device adopted in same
A shale gas and fracturing technology, applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., can solve the problems of limited mining depth, long transportation distance, waste of energy, etc., to avoid pressure loss and service life Long, unbreakable effect
Inactive Publication Date: 2014-07-02
王及元
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Problems solved by technology
[0002] At present, in order to drill deep shale gas at home and abroad, the method of transporting high-pressure water from the vertical well on the ground, and then transporting the high-pressure water to the fracturing face through the high-pressure water pipeline through the horizontal well is used to fracture the shale. Shale fracturing usually requires a maximum pressure of 100MPa. Due to the frictional resistance of the transmission pipeline, the water pressure will be damaged, so the maximum output water pressure of the pressure equipment needs to reach 140MPa. Therefore, this method requires high fracturing equipment. , the equipment cost is high, the effective working life of the equipment is short under this working condition, and due to the long transmission distance, the pressure loss is large, energy is wasted, and the mining depth is limited
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[0010] refer to figure 1 Firstly, vertical well 1 and horizontal well 2 are drilled, and fracturing devices are set: acidification, sand mixing device 3, program control device 4 and water source; the feature is: the vertical shaft is expanded near the fracturing face to form a diameter expansion Section 6, when running the well pipe, expand the screen pipe in the diameter expansion section, and then use the expansion method to expand the diameter of the expansion screen pipe, and then install a booster 7 in the diameter expansion section of the expansion screen pipe, and set a medium pressure water pump on the ground 5. The water inlet of the medium-pressure water pump is connected to the water source with a pipeline, and the water output by the medium-pressure water pump with a pressure of 2-10 MPa is injected into the downhole fracturing face, and it is also used as the power source of the supercharger. After being filled with water), the high-pressure chamber of the superc...
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The invention relates to a deep shale gas drilling and exploiting method and a fracturing device adopted in the method. The method and the device mainly aim to solve the problem that the shale gas drilling and exploiting depth is limited currently. The method includes the steps that a vertical well and a horizontal well are drilled, and the fracturing device is arranged; the diameter of the vertical well is enlarged close to a fracturing working face, an expansion screen pipe is fed into an enlarged section, the diameter of the expansion screen pipe is enlarged, a pressurizer is installed in the enlarged section, a water inlet of an intermediate-pressure water pump arranged on the ground is connected with a water source through a pipeline, water, output by the intermediate-pressure water pump, 2 MPa -10 MPa in pressure is injected into the underground fracturing working face and serves as a power source of the pressurizer at the same time, a high-pressure cavity of the pressurizer conveys high-pressure water with the maximum pressure of 140 MPa to the high-pressure pipeline communicated with the fracturing working face, and accordingly shale can be easily fractured. The fracturing device comprises an acidizing device, a sand mulling device, a program control device, the pressurizer, the intermediate-pressure water pump and a control valve. The deep shale gas drilling and exploiting method and the fracturing device adopted in the method have the advantages that deeper shale gas can be exploited.
Description
Technical field: [0001] The invention relates to a method for drilling deep shale gas and a device used therein. Background technique: [0002] At present, in order to drill deep shale gas at home and abroad, the method of transporting high-pressure water from the vertical well on the ground, and then transporting the high-pressure water to the fracturing face through the high-pressure water pipeline through the horizontal well is used to fracture the shale. Shale fracturing usually requires a maximum pressure of 100MPa. Due to the frictional resistance of the transmission pipeline, the water pressure will be damaged, so the maximum output water pressure of the pressure equipment needs to reach 140MPa. Therefore, this method requires high fracturing equipment. , the equipment cost is high, the effective working life of the equipment is short under this working condition, and due to the long transmission distance, the pressure loss is large, energy is wasted, and the mining d...
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Inventor 王及元
Owner 王及元