The invention relates to gelled acid used for
acid fracturing of a high-temperature fractured-vuggy type
carbonate reservoir. The gelled acid comprises components in percentage by weight as follows: 20% of
hydrochloric acid (HCl), 3% of a gelling agent (TP-1), 2% of a
corrosion inhibitor (MC50), 1.5% of a
ferric ion stabilizer (FL4-7), 0.05% of a demulsifying agent (PRJ), 1.5% of a
discharge aiding agent (AD12) and the balance of water. The gelled acid can
resist a temperature of 130 DEG C, and has an excellent rheological property and shearing resistance, good compatibility and
filtration reduction performance and low
frictional resistance; compared with common acid (20% of HCl), the acid-rock
reaction speed can be reduced by 52%; under the condition of high temperature, the
processing depth of the gelled acid to the stratum is enlarged, acidulating efficiency and success rate are increased, and
pipe column
corrosion and formation damage can be effectively reduced simultaneously, the gelled acid is prone to flowback and has a capacity of carrying
solid-phase particles, the
acid dissolution time of the gelling agent is short, so that field preparation is facilitated, and the gelled acid is very suitable for
acid fracturing improvement of the high-temperature fractured-vuggy type
carbonate reservoir.