Wellhead ball catcher and ball catch method for staged fracturing of shale gas

Abstract

The embodiment of the invention discloses a wellhead ball catcher for staged fracturing of shale gas, which includes a first pipeline, a second pipeline and a vertical pipeline, and the second pipeline is provided with an elastic filter plate at the connection with the vertical pipeline , the elastic filter plate is provided with a number of seepage mesh holes, the lower surface of the second pipeline is also provided with a liquid recovery mechanism, the inside of the vertical pipeline is provided with an automatic ball storage mechanism, and the liquid recovery mechanism includes a filter leak on the second pipeline, The filter sieve is connected with a recovery pipeline, and the end of the recovery pipeline is connected with the second pipeline on the rear side of the elastic filter plate; the implementation steps of the ball catching method are specifically to form a negative pressure airflow in the fracturing air pipe; the fracturing ball and the fracturing slurry along the The fracturing gas pipe is moved up to the wellhead ball catcher; the fracturing balls and fracturing fluid are separated and collected in the wellhead ball catcher; the fracturing balls are automatically transferred to the ball storage space; this scheme adds automatic flipping to the wellhead ball catcher The blades can be turned over to discharge the fracturing balls to ensure the tightness of the wellhead ball catcher.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of shale gas development, and in particular to a wellhead ball catcher and a ball catch method for staged fracturing of shale gas. Background technique [0002] As a new clean energy source, shale gas is gradually becoming a hotspot of global energy development. Compared with conventional natural gas, the development potential of shale gas resources is likely to be greater than that of conventional natural gas, but shale gas reservoirs have the characteristics of low saturation and low permeability, and the gas resistance is greater than that of conventional natural gas, so generally Under these circumstances, shale gas cannot be self-produced or the output is very low, and its recovery rate is very low, and large-scale economic exploitation cannot be realized. The flow resistance of shale gas is large. If the traditional mining method is used, the development of shale gas reservoi...

AI Technical Summary

Problems solved by technology

[0005] After the existing wellhead ball catcher catches the ball, its catch space and ball storage space need to be replaced manually. Therefore, the staff must always observe the capture of the fracturing ball, and manually switch the valve switch mechanism in time. If the valve is not switched in time switch, the frac ball will block the wellhead ball catcher under pressure, causing a huge safety hazard

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