Thickened oil thermal production channel blocking nano-composite gel

Abstract

The invention provides thickened oil thermal production channel blocking nano-composite gel. The gel comprises, by weight, 0.4-0.5 part of a main agent, 0.1-0.3 part of an organic chromium cross-linking agent, 0.1-0.5 part of an inorganic chromium cross-linking agent, 1-1.5 parts of a reinforcer, 0.2-0.4 part of a stabilizer, 0.1-0.5 part of a dehydration inhibitor and the balance water, wherein the sum of the weight parts of the components is 100. The main agent refers to partially hydrolyzed polyacrylamide. The organic chromium cross-linking agent refers to malonic acid chromium. The inorganic chromium cross-linking agent is sodium bichromate, and the ratio of the sodium bichromate to sodium sulfite is 1:1-3. The reinforcer is silica soil nano particles, and the ratio of the silica soil nano particles to amino silane is 2-5:1. The stabilizer is thiourea. The dehydration inhibitor is one or a combination of polyphosphates and phosphoro-amidate. The ratio of the polyphosphates to the phosphoro-amidate is 1-4:1 during combination. According to the thickened oil thermal production channel blocking nano-composite gel provided by the invention, the gel forming temperature can be selected to be 50-180 DEG C, the gel forming time is adjustable within the range of 12-60h, gel strength is high, viscoelasticity is good, temperature resistance water-holding power is high, no dehydration phenomenon happens after ageing for 3 months under the temperature condition of 180 DEG C, and steam channeling caused in the thickened oil thermal production process can be blocked selectively.

Description

technical field [0001] The invention relates to a channeling sealing agent, in particular to a nanocomposite jelly for channeling sealing in heavy oil thermal recovery. Background technique [0002] The massive exploitation and utilization of petroleum resources make it increasingly scarce, and the exploitation and utilization of heavy oil can alleviate the shortage of high-quality petroleum resources. Heavy oil has high density, high viscosity and poor fluidity, and is difficult to exploit. At present, thermal recovery is mainly used to extract heavy oil. The commonly used thermal recovery methods include steam huff and puff and steam flooding. For different heavy oil resources, affected by geological factors such as reservoir thickness and heterogeneity, as well as the compatibility between injected steam and formation fluid, steam channeling is prone to occur in the middle and late stages of thermal recovery. Especially when the number of thermal recovery rounds increase...

AI Technical Summary

Problems solved by technology

Chinese Invention Patent Application Publication CN104277802A discloses a high-temperature-resistant composite gel blocking agent and its preparation method. The parts by weight include: 85-90 parts of water, 0.1-0.5 parts of high-molecular polyacrylamide, 0.2- 0.5 parts of polyol retarder regulator, 1 part-1.5 part of 30% inorganic acid and 8 parts-15 parts of water-soluble silicate, the water-soluble silicate used in this invention has a good effect on water vapor and crude oil The plugging is not selective, so it has a blocking effect on both the steam channeling channel and the oil flow channel, so that the blocking agent will reduce the crude oil production while blocking the steam channeling

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