Carbon dioxide thickening and sand adding integrated method and device

Abstract

The invention relates to a carbon dioxide thickening and sand adding integrated method and device. The carbon dioxide thickening and sand adding integrated method comprises the steps that a sand adding device adds sand, a cooler refrigerates sand-carrying liquid, the sand-carrying liquid and a propping agent are mixed in a sand mixing stirring tank, a piston type solid pump conveys high-concentration sand liquid to the stirring tank, a booster pump pumps liquid carbon dioxide, then the liquid carbon dioxide enters a carbon dioxide stirring tank through a circulating ejector, and the mixed sand liquid is controlled by a rotary valve to enter a fracturing truck. According to the carbon dioxide thickening and sand adding integrated method and device, the problems that carbon dioxide is low in viscosity, difficult to carry sand and low in sand ratio are solved, the sand blocking risk in the carbon dioxide sand adding process is reduced, and stable sand adding with the high sand ratio in carbon dioxide fracturing construction is achieved.

Description

technical field [0001] The invention belongs to the field of oil and gas development, and in particular relates to a method capable of realizing thickening of liquid carbon dioxide and continuous sanding in the reforming process of carbon dioxide sanding fracturing. Background technique [0002] Carbon dioxide fracturing technology is a fracturing technology that is constantly improving. Compared with the traditional fracturing technology based on water-based fracturing fluid, carbon dioxide fracturing has the characteristics of less reservoir pollution, greater stimulation intensity and long effect period. , especially for high water content or water-locked reservoirs, clay minerals that are easy to migrate or expand, low permeability and other unconventional reservoirs that are difficult to reform, and reservoirs where fracturing fluid flowback is difficult, carbon dioxide fracturing has a better effect. Apply effects. Since it was first applied in North America in the 19...

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide an integrated method and device for carbon dioxide thickening and sanding, which solves the problems of low carbon dioxide viscosity, difficulty in carrying sand, and low sand ratio, reduces the risk of sand plugging in the process of carbon dioxide sanding, and realizes carbon dioxide fracturing construction Medium to high sand ratio and smooth addition of sand

Images