Weighted fracturing fluid

Abstract

The invention provides a weighted fracturing fluid. The weighted fracturing fluid is a liquid system prepared by using the following raw materials, by weight, 29-70.5 parts of a weighting agent, 0.2-0.8 parts of a vegetable glue thickener, 0.1-0.8 parts of a cleanup additive, 0.02-0.15 parts of a bactericide, 0.05-0.3 parts of a pH value adjusting agent, 0.1-0.7 parts of a cross-linking agent, 0.03-0.2 parts of a gel breaker and 29.5-71 parts of water. The density of the fracturing fluid at room temperature is 1.22-1.62g / cm<3> or more; the temperature resistance capability of the fracturing fluid can reach above 200DEG C; and the fracturing fluid has the characteristics of cross-linking delaying, low frictional resistance, good cross-linking performance, strong temperature and shear resistance, low filter loss, thorough gel breaking, low residue content, good expansion resistance and the like.

Description

technical field [0001] The invention relates to the technical field of oil and gas well reservoir fracturing reconstruction, in particular to a high-temperature-resistant ultra-high-density fracturing fluid, which belongs to the weighted water-based fracturing fluid, and is suitable for high-pressure wells or abnormally high-pressure fracturing fluids. Fluid system for well fracturing stimulation. Background technique [0002] Fracturing fluids include water-based fracturing fluids, oil-based fracturing fluids, alcohol-based fracturing fluids, and multiphase fracturing fluids. At present, conventional water-based fracturing fluids are generally used in oilfield fracturing stimulation. However, in some high-pressure or abnormally high-pressure wells, due to the high wellhead pressure during construction, the density of conventional water-based fracturing fluids is low, which cannot guarantee the safety of construction and the effectiveness of measures, and it is even impossi...

AI Technical Summary

Problems solved by technology

[0004] At present, the exploitation of crude oil in some oilfields is mainly affected by factors such as deep burial, poor physical properties, abnormal high pressure, and compact rock. In deep wells and abnormally high-pressure formations, the construction pressure is high, the construction displacement is small, and it is difficult to add sand; the natural fractures are developed, the fracturing fluid has a large filtration loss, and the fracturing fluid fracture efficiency is low; the friction of the ultra-deep well string is high, and the fracturing fluid The wellbore shear time is long, and the fracturing fluid is required to have low friction and strong shear resistance while meeting the sand-carrying performance