200-DEG C super-high temperature fracturing fluid

Abstract

The invention relates to a 200-DEG C super-high temperature fracturing fluid. The fracturing fluid comprises the following components in terms of mass percentage: 0.60% of carboxymethyl hydroxypropyl guar gum, 0.35% of polyacrylamide, 0.18% of organosilicon polyether, 0.09% of polyoxypropylene polyoxyethylene polyoxypropylene octadecanol ether, 0.24% of dodecyl ammonium chloride, 0.12% of cation long chain polymer, 0.33% of organo-metallic crosslinker, 0.00027% of persulfate, 0.0001% of high-valence oxysalt and the balance of water. The fracturing fluid is high-temperature-resistant and shear-resistant and has complete gel breaking property.

Description

Technical field: [0001] The invention relates to a fracturing fluid used in the field of oil recovery in an oil field, in particular to a fracturing working fluid used in fracturing an ultra-high temperature reservoir at 200°C. Background technique: [0002] With the continuous deepening of the deep exploration process, natural gas reservoirs have been discovered at a burial depth of about 4000m, and proven reserves of 100 billion cubic meters have been submitted. One of the core technologies of reservoir fracturing stimulation. [0003] Fracturing fluid is the working fluid of fracturing construction, which is used to transfer energy during construction, make the oil layer open fractures, and transport proppant along the fractures, thereby forming a high conductivity channel in the oil layer, so as to facilitate the oil and gas from the formation far away. It flows to the bottom of the well to achieve the purpose of increasing production. Due to the large scale and long c...

AI Technical Summary

Problems solved by technology

[0004] For the modified guar gum polymer commonly used in water-based fracturing operations, in a high-temperature environment, the oxygen molecules dissolved in water will gain enough energy to form active oxygen free radicals through fission, while the oxygen molecules in the polymer The ether bond is the most fragile, and it is easy to cause oxidative degradation after being attacked by oxygen free radicals; and due to the limitation of the temperature resistance limit of vegetable glue, the main chain of vegetable glue molecules exceeding 177°C will break, which will also lead to the degradation of fracturing fluid; in addition, cross-linking Reduced agent activity

Therefore, the shear resistance of the fracturing fluid will be poor, and effective dynamic fractures and fracture widths suitable for sanding will not be formed, and the fracturing measures will lose the production stimulation effect. Therefore, the mature high-temperature fracturing fluids in the past can no longer meet the requirements of 200°C ultra-high temperature. Reservoir fracturing needs

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