Reusable slippery water fracturing fluid for shale oil and gas reservoir

Abstract

The invention discloses reusable slippery water fracturing fluid for a shale oil and gas reservoir. The reusable slippery water fracturing fluid for the shale oil and gas reservoir comprises the following components in percentage by weight: 0.02 to 0.08 percent of a resistance reducing agent, 0.7 to 1.5 percent of a discharge aid, 8 to 12 percent of an auxiliary discharge aid, 5 to 10 percent of an interfacial tension-reducing synergist, 0.05 to 0.1 percent of a clay stabilizer, 0.007 to 0.01 percent of a sterilizing agent, 0.04 to 0.06 percent of a scale inhibitor and the balance of water. The reusable slippery water fracturing fluid for the shale oil and gas reservoir has the beneficial effects that (1) the resistance reducing agent can be dispersed and dissolved quickly to form a uniform system, so the problem of difficulty in large-scale intermediate liquid preparation in a shale fracturing process is solved; (2) the slippery water fracturing fluid can be reused, so the treatment cost of return liquid is reduced; (3) the resistance reducing ratio of the slippery water is more than 75 percent, so large-displacement construction is realized, the requirement on pump injecting equipment is reduced, and the frictional resistance of the slippery water in a pipeline in a large-displacement fracturing construction process can be effectively reduced; and (4) the slippery water fracturing fluid has a wide application range, strong temperature adaptability and temperature adaptability, and low requirement on water quality.

Description

technical field [0001] The invention relates to a reusable slick water fracturing fluid used in shale oil and gas reservoirs, more specifically, to a recyclable slick water fracturing fluid for shale oil and gas reservoirs that is instant and has a high resistance reduction rate Fracturing fluid. Background technique [0002] The development of shale oil and gas reservoirs is currently the most popular technical field in the petroleum industry. my country has abundant shale oil and gas reserves. Under the guidance of government policies, Sichuan, Henan, Jianghan, Guizhou and other places have entered the development stage, and some areas have obtained industrial gas flow. [0003] The fracturing fluid used in conventional reservoir fracturing stimulation measures is guar gum or polymer as a thickener, but this liquid has high residue and great damage and is not suitable for shale oil and gas reservoirs, and it is difficult to achieve large drainage due to high friction Quan...

AI Technical Summary

Problems solved by technology

[0004] However, the current slick water suitable for the development of shale oil and gas reservoirs has the following defects: (1) The dissolution and dispersion time is too long, which is not suitable for the immediate fluid mixing requirements of large-scale fracturing in shale; (2) The resistance reduction rate is about 60%. About, difficult to meet 10m 3 Requirements for the resistance reduction rate of fracturing fluid during the construction process of the above displacement; (3) Difficulty in the treatment of flowback fluid