A method for selecting fracturing fluid

Abstract

The invention discloses a method for selecting fracturing fluid, which belongs to the technical field of shale gas. The selection method includes: obtaining the temperature, pressure, and core samples of the target reservoir; using the temperature and pressure of the target reservoir as the fracturing test conditions, and using the target fracturing fluid to carry out fracturing tests on the core samples; Inject the fracture characterization agent into the sample until the fracture characterization agent fills the fractures of the core sample; obtain the fracture information of the core sample according to the fracture characterization agent; judge whether the target fracturing fluid meets the requirements according to the fracture information, and if it meets the requirements, select the target pressure The core sample is a shale outcrop with the same age as the target reservoir, and the simulated wellbore is buried along the sedimentary bedding direction; the cementing casing is set in the simulated wellbore, and the bottom of the cementing casing is in line with the simulated wellbore. The bottom forms the naked eye segment. The selection method provided by the invention can effectively select the target fracturing fluid suitable for the target reservoir, so as to increase the production volume of shale gas wells.

Description

technical field [0001] The invention relates to the technical field of shale gas, in particular to a method for selecting fracturing fluid. Background technique [0002] Shale gas is an unconventional natural gas that is stored in shale formations and mainly exists in adsorption and free states. In order to increase the production of shale gas, hydraulic fracturing is usually used to fracturing shale gas wells. Among them, the performance of the fracturing fluid used in hydraulic fracturing affects the fracturing effect. Therefore, before fracturing shale gas wells, it is necessary to select a fracturing fluid that is compatible with shale gas reservoirs. [0003] At present, the selection of fracturing fluid is mainly based on factors such as rheological properties of fracturing fluid, damage performance to shale gas reservoirs, and resistance reduction performance. If the rheological properties of the fracturing fluid are good, the damage to the shale gas reservoir is sm...

AI Technical Summary

Problems solved by technology

[0005] When selecting the fracturing fluid, the influence of the structure, composition, temperature and pressure of the shale reservoir on the fracturing effect of the fracturing fluid is not considered, which will lead to a poor compatibility between the selected fracturing fluid and the shale reservoir , affecting the volume of fractures formed in shale gas reservoirs, and the fracturing effect on shale gas reservoirs is not good