Fracturing method for improving formation pressure

Abstract

The invention discloses a fracturing method for improving formation pressure. The fracturing method sequentially comprises an energizing fracturing fluid stage, a prepad fluid stage, a sand-carrying fluid stage and a displacement fluid stage; in the energizing fracturing fluid stage, energizing fracturing fluid is injected into an oil well, and after injection is completed, the well is closed for diffusion; in the prepad fluid stage, after well shut-in diffusion in the energizing fracturing fluid stage is completed, prepad fluid is injected into the oil well; in the sand-carrying fluid stage, the prepared sand-carrying fluid is injected into the oil well through a fracturing truck; and in the displacement fluid stage, after injection of the sand-carrying fluid is completed, displacement fluid is injected, the well is closed after injection of the displacement fluid is completed, and fracturing is completed; The energizing fracturing fluid fully enters the formation, so that the purpose of increasing the pressure of the formation is achieved; then the prepad fluid, the sand-carrying fluid and the displacement fluid are sequentially injected, the well is closed after the displacement fluid is injected, part of fracturing fluid is percolated to the formation, and the formation pressure is further increased; and the formation pressure near a well hole and a crack is higher, and it is ensured that the oil well can obtain higher yield and has longer stable production time.

Description

technical field [0001] The invention relates to the technical field of petroleum fracturing operations, in particular to a fracturing method for increasing formation pressure. Background technique [0002] For oil wells with low formation pressure or oil wells whose formation pressure has dropped after long-term production, the existing hydraulic fracturing technology can increase the production of oil wells, but due to the low formation pressure and lack of effective displacement energy, the production after fracturing Low, the yield drops rapidly, and the effect of increasing yield is poor. Contents of the invention [0003] Aiming at the deficiencies in the prior art, the present invention provides a fracturing method for increasing formation pressure, so as to increase the formation pressure while performing fracturing, and increase the output of oil wells after repeated fracturing and the effective period of measures. [0004] To achieve the above object, the technic...

AI Technical Summary

Problems solved by technology

[0002] For oil wells with low formation pressure or oil wells whose formation pressure has dropped after long-term production, the existing hydraulic fracturing technology can increase the p