Preparation process of quartz sand for shale gas fracturing

Abstract

The invention discloses a preparation process of quartz sand for shale gas fracturing, belongs to the technical field of quartz sand preparation, and solves the problem of high turbidity of quartz sand for fracturing in the prior art. The preparation process comprises the following steps: (1) quartz ore crushing; (2) quartz sand grading; (3) magnetic separation of quartz sand; (4) quartz sand desliming; (5) quartz sand drying; (6) quartz sand screening; and (7) weighing and packaging, wherein the quartz sand crushed in the step (1) is put into a washing system to be washed for 20-30min, the moisture content of the dried quartz sand in the step (5) is smaller than 0.001%, and secondary magnetic separation is conducted after drying to remove residual magnetic metal impurities. The problems of low spherical coefficient and high turbidity of quartz sand for fracturing are effectively solved, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of quartz sand production, and in particular relates to a preparation process of quartz sand for shale gas fracturing. Background technique [0002] Shale gas development has its own unique way. At present, the United States already has some advanced technologies to increase the production of shale gas wells, mainly including horizontal well technology and multi-layer fracturing technology, clear water fracturing technology, repeated fracturing technology, and simultaneous fracturing technology. etc. These technologies are continuously improving the production of shale gas wells. [0003] Quartz sand can be used to make quartz sand fracturing proppant for shale gas fracturing, etc., and the demand for high-quality quartz sand has increased sharply. When this kind of quartz sand is used for shale gas fracturing, it is necessary to clean the quartz sand to remove the sediment attached to the surface of the qu...

AI Technical Summary

Problems solved by technology

When this kind of quartz sand is used for shale gas fracturing, it is necessary to clean the quartz sand to remove the sediment attached to the surface of the quartz sand. There is a high requirement for the impurity content of the quartz sand, but simple cleaning cannot significantly reduce the The turbidity of quartz sand, high turbidity quartz sand is not conducive to the development of shale gas fracturing, and there are also certain requirements for the spherical coefficient of quartz sand, which has become a difficult problem in the industry and needs to be solved urgently