Fracturing equipment for coal bed gas exploiting

Abstract

The invention discloses fracturing equipment for coal bed gas exploiting. A special pressurizing mixing mechanism is arranged to fully mix and pressurize high pressure water and sand grains fed by a sand grain supply mechanism and the mixture is sprayed through a fracturing pipe. Therefore, the sand grains are not sprayed by a high pressure pump, so that the problem that the sand grains damage blades of the high pressure pump can be solved effectively. Meanwhile, before the sand grains enter into the pressurizing mixing mechanism, the sand grains are mixed by using a lubricant, so that the condition that the cutting action to coal bed fractures is reduced as the sharp edges of the sand grains are damaged is prevented, and the fracturing and crack-increasing effects are achieved. By arranging a filter base, the sand grains can be prevented from entering a piston end, so that the piston end is prevented from being damaged. Meanwhile, increase of the pressure and the mixing action of thesand grains and the high pressure water can be also guaranteed.

Description

technical field [0001] The invention relates to the technical field of coalbed methane exploitation, in particular to a coalbed methane exploitation fracturing equipment. Background technique [0002] The fracturing equipment used in the fracturing process, the fracturing pump is one of the main equipment to increase the gas production. The fracturing pump can transport the fracturing fluid to the bottom of the well, causing the rock at the bottom of the well to crack to increase the gas permeability and increase Rapid flow of gas below the formation to increase oil production. With the improvement of people's requirements for the use of gas, fracturing pumps are also developing towards high power, high pressure, large displacement, diversified output media, and multi-function. [0003] Traditional fracturing equipment generally uses fracturing pumps for direct fracturing with high-pressure water. This fracturing method has a certain effect on the initial fracturing. Howeve...

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Problems solved by technology

[0003] Traditional fracturing equipment generally uses fracturing pumps for direct fracturing with high-pressure water. This fracturing method has a certain effect on the initial fracturing. However, as the fracturing progresses, the pressure needs to be continuously increased, which means As a result, the volume of the pressure pump is very large. For this reason, in order to improve the operation of the fracturing pores, it is sometimes necessary to combine hydraulic sandblasting with sand particles for fracturing for a period of time, and then use ordinary water fracturing. The combination of the two can Cut the cracks in the coal seam and gradually increase the cracks

However, when the sand is pumped, if the high-pressure pump is used directly, due to the high pressure of the high-pressure pump, these sand particles are easy to damage the blades of the high-pressure pump and affect the life of the high-pressure pump. Moreover, the cost of a large high-pressure pump is very high. Seriously affect economic benefits

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