A thickening acid for acid fracturing of high-temperature fracture-cavity carbonate reservoirs
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, long time for on-site preparation, weak acid viscosification ability, etc. problems, to achieve the effects of good compatibility and fluid loss control performance, reduced reservoir damage, and short acid dissolution time
Inactive Publication Date: 2017-02-08
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology
[0015] At present, domestic thickener products used in acid fracturing of high-temperature carbonate rock reservoirs above 120 °C mostly show shortcomings such as being greatly affected by shearing, weak acid viscosity-increasing ability, and long preparation time on site. It can overcome the above shortcomings, but it does not comprehensively consider the severe corrosion of the pipe string and the damage of the reservoir, the size of friction resistance, and the effect of flowback under the high temperature condition of deep well, and the formula is incomplete and perfect
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[0033] A thickening acid for acid fracturing of high-temperature fracture-cavity carbonate rock reservoirs, characterized in that the thickening acid comprises, by weight percentage: hydrochloric acid, 20%; thickening agent, 3%; corrosion inhibitor agent, 2%; iron ion stabilizer, 1.5%; demulsifier, 0.05%; drainage aid, 1.5%; the balance is water.
[0034] The preparation process is as follows: first dilute industrial hydrochloric acid to a concentration of 20%, then add 1.5% iron ion stabilizer FL4-7, 0.05% demulsifier PRJ, 1.5% Drainage aid AD12, then add 3% thickener TP-1, at room temperature, mix evenly and swell for about 2 hours, the thickener can be fully dissolved and thickened in the formula acid solution, finally add 2% Corrosion inhibitor MC50, made into thickened acid after fully stirring.
[0035] The selection of thickener is an important point in the preparation of thickened acid. figure 1 It shows the viscosity measurement curve of thickened acid (20% HCl) pre...
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Abstract
The invention relates to a thickening acid for acid fracturing of high-temperature fracture-cavity carbonate reservoirs. The weight percentage of each component is: hydrochloric acid (HCl): 20%; thickening agent (TP-1): 3% ; Corrosion inhibitor (MC50): 2%; Iron ion stabilizer (FL4‑7): 1.5%; Demulsifier (PRJ): 0.05%; Drainage aid (AD12): 1.5%; the rest is water. The invention has a temperature resistance of 130°C, good rheology and shear resistance, good compatibility and fluid loss control performance, and low friction resistance. Compared with ordinary acid (20% HCl), the acid-rock reaction speed can be reduced by 52 %. Under high temperature conditions, this system expands the treatment depth of the acid solution to the formation, improves the efficiency and success rate of acidification, and can effectively reduce pipe string corrosion and reservoir damage. It is easy to flow back, and has the ability to carry solid particles. The acid-dissolving time of the chemical agent is short, which is convenient for on-site preparation, and is very suitable for acid fracturing stimulation of high-temperature fractured-vuggy carbonate reservoirs.
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...
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IPC IPC(8): C09K8/74
CPCC09K8/602C09K8/725C09K8/74C09K8/882C09K2208/32
Inventor 郭天魁曲占庆龚迪光田雨杨阳王冰李小龙黄德胜
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)