Gelled acid used for acid fracturing of high-temperature fractured-vuggy type carbonate reservoir

A carbonate reservoir, fracture-cavity type technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problem of incomplete and perfect formula, weak acid viscosification ability, long time for on-site preparation, etc. problems, to achieve the effects of good compatibility and fluid loss control performance, short acid dissolution time, and reduced reservoir damage
CN103820100AInactive Publication Date: 2014-05-28CHINA UNIV OF PETROLEUM (EAST CHINA)
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA UNIV OF PETROLEUM (EAST CHINA)
Publication Date
2014-05-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

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.
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Description

technical field

[0001] The invention relates to the acid fracturing stimulation technology for carbonate rock reservoirs, in particular to the thickening acid technology for acid fracturing of high-temperature fracture-cavity carbonate rock reservoirs. Background technique

[0002] Acid fracturing is the most effective stimulation measure for the development of carbonate reservoirs, and its success depends on the effective length of acid-etched fractures and the conductivity of acid-etched fractures after acid fracturing. For high-temperature deep wells, in addition to being controlled by rock properties and in-situ stress fields, the effective acid-etched fracture length is mainly controlled by the acid-rock reaction rate and the fluid loss characteristics of acid fluid. The conductivity of acid-etched fractures depends on the closure stress of the formation, the compressive strength of the rock, the amount of acid-dissolved rock, and the irregularity of the acid-etched sha...

Claims

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