Thickened oil thermal production channel blocking nano-composite gel

A heavy oil thermal recovery and nano-composite technology, which is applied in the direction of drilling compositions, chemical instruments and methods, can solve the problems of reducing crude oil production, and achieve the effects of ensuring heavy oil production, good stability and simple process

Active Publication Date: 2017-04-26
YANGTZE UNIVERSITY
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  • Application Information

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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-1

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  • Thickened oil thermal production channel blocking nano-composite gel

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Experimental program
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Effect test

Embodiment 1

[0036] Add 0.05 part of sodium dichromate, 0.05 part of sodium sulfite, 0.3 part of chromium malonate, 1 part of silica sol nanoparticles, 0.2 part of aminosilane, 0.4 part of thiourea, and 0.1 part of polyphosphate into 47.9 parts of tap water, and stir well , make it fully dissolved, and then mix 50 parts of partially hydrolyzed polyacrylamide with a mass concentration of 1% prepared by tap water with the above solution, and stir evenly to obtain the gelling solution of the present invention. The gelling time of the gelling solution is 60 hours at 50° C., and the obtained jelly strength (measured by the vacuum breakthrough method) is 0.077 MPa, and there is no dehydration phenomenon after aging at 180° C. for 3 months.

[0037] Taking the above-mentioned nano-composite jelly for thermal recovery sealing of heavy oil as the research object, physical simulation experiments are conducted to illustrate the sealing ability of the thermal recovery sealing jelly for steam. The sand...

Embodiment 2

[0039] Add 0.1 part of sodium dichromate, 0.3 part of sodium sulfite, 0.2 part of chromium malonate, 0.9 part of silica sol nanoparticles, 0.18 part of aminosilane, 0.2 part of thiourea, and 0.1 part of aminophosphonate into 48.02 parts of tap water, and stir well , make it fully dissolved, and then mix 50 parts of partially hydrolyzed polyacrylamide with a mass concentration of 1% prepared by tap water with the above solution, and stir evenly to obtain the gelling solution of the present invention. The gelling time of the gelling liquid was 56 hours at 60° C., the strength of the obtained jelly was 0.081 MPa, and there was no dehydration phenomenon after aging at 180° C. for 3 months.

[0040] Taking the above-mentioned nano-composite jelly for thermal recovery sealing of heavy oil as the research object, physical simulation experiments are conducted to illustrate the sealing ability of the thermal recovery sealing jelly for steam. The sand filling pipe used in this test has ...

Embodiment 3

[0042] Add 0.2 part of sodium dichromate, 0.3 part of sodium sulfite, 0.1 part of chromium malonate, 0.9 part of silica sol nanoparticles, 0.18 part of aminosilane, 0.2 part of thiourea, and 0.15 part of polyphosphate into 47.97 parts of tap water, and stir well , make it fully dissolved, and then mix 50 parts of partially hydrolyzed polyacrylamide with a mass concentration of 1% prepared by tap water with the above solution, and stir evenly to obtain the gelling solution of the present invention. The gelling time of the gelling solution was 49 hours at 70° C., and the strength of the obtained jelly was 0.078 MPa. There was no dehydration phenomenon after aging at 180° C. for 3 months.

[0043] Taking the above-mentioned nano-composite jelly for thermal recovery sealing of heavy oil as the research object, physical simulation experiments are conducted to illustrate the sealing ability of the thermal recovery sealing jelly for steam. The sand filling pipe used in this test has ...

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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...

Claims

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Application Information

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IPC IPC(8): C09K8/512C09K8/592C09K8/88
CPCC09K8/512C09K8/592C09K8/887C09K2208/10
Inventor 陈立峰付美龙朱晓明
Owner YANGTZE UNIVERSITY
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