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Reaction heat control method in heavy oil in-situ exothermic reaction oil displacement process

A technology of exothermic reaction and oil displacement process, which is applied in earthwork drilling, sustainable manufacturing/processing, wellbore/well components, etc., can solve the problem of high energy consumption, reduce crude oil viscosity, and increase heavy oil recovery Effect

Pending Publication Date: 2022-07-12
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can effectively improve the recovery rate of heavy oil reservoirs, but since the heat required by the thermal fluid needs to be supplied from the ground, the whole method consumes a lot of energy

Method used

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  • Reaction heat control method in heavy oil in-situ exothermic reaction oil displacement process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 39.9gCo(NO 3 ) 2 6H2O, diluted to a certain volume with deionized water, and loaded to 32.68g SiO by equal volume impregnation 2 On the carrier, after standing for 12h, drying at 120°C for 8h, and calcining at 400°C for 4h in a muffle furnace to obtain Co / SiO with a metal loading of about 20% 2 Fischer-Tropsch catalyst. Then, a simulated in-situ underground modification experimental device was used to simulate the oil recovery of the formation. The device was filled with rock cuttings, saturated with water first, and then saturated with heavy oil at 200°C. The water vapor with a temperature of 230°C and a dry content of 70% was injected through the steam injection port to increase the formation temperature. After the bottom layer temperature increased to 210°C, 40ml of Fischer-Tropsch synthesis catalyst was injected into the simulated formation through the injection port using Fischer-Tropsch oil as the carrier liquid. . After the catalyst injection is complet...

Embodiment 2

[0028] Carry out the oil displacement experiment according to the method of Example 1, the difference is that the temperature of the injected steam is 250°C, the dryness is 80%, and the formation temperature is increased to 230°C, the composition, injection volume and pressure of the feed gas remain unchanged, and the reaction is completed. The post-heavy oil recovery is 62.1%.

Embodiment 3

[0030] The oil displacement experiment was carried out according to the method of Example 1, except that 80g Cu(NO3)2·3H2O was weighed, diluted to a certain volume with deionized water, and loaded to 50g Al by the equal volume impregnation method. 2 O 3 On the carrier, after standing for 12 hours, drying at 120 °C for 8 hours, and calcining at 350 °C for 4 hours in a muffle furnace to obtain Cu / Al with a metal loading of about 30% 2 O 3 Syngas to methanol catalyst. Inject 40ml of synthesis gas to methanol catalyst. After the catalyst injection is completed, inject raw material gas and water vapor. The mass ratio of raw material gas to water vapor is 1:1, and the H in the raw material gas is 2 70% content, 25% CO content, CO 2 The content is 5%, the internal pressure of the reactor is controlled to be 3.0MPa, and the injection space velocity of synthesis gas is 2000h. -1 , the reaction gas was continuously fed until no heavy oil was recovered, and the recovery rate of heavy...

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Abstract

The invention discloses a reaction heat control method in a heavy oil in-situ exothermic reaction oil displacement process, which comprises the following steps of: injecting high-pressure gas or liquid into an underground oil layer, pressing out a crack in the oil layer, continuously injecting hot water vapor into the underground oil layer, and after the temperature of the underground oil layer is higher than the critical temperature of exothermic reaction, stopping heating; an exothermic reaction catalyst, reaction raw material gas containing H2 and CO and hot water vapor are injected into the underground oil layer, and the reaction raw material gas makes contact with the exothermic reaction catalyst in the underground oil layer and has an exothermic reaction; products and heavy oil in the underground oil layer flow into a production well together and are extracted; when the viscosity of the produced liquid of the production well is lower than the viscosity lower limit value, the heat release amount of the heat release reaction is adjusted and reduced; and when the viscosity of the produced liquid of the production well is higher than the viscosity upper limit value, the heat release amount of the heat release reaction is adjusted and improved. According to the method, the exothermic reaction occurs in the underground oil layer, so that the use amount of hot water vapor in the heavy oil thermal recovery process is reduced, the viscosity of the heavy oil is reduced, and the recovery efficiency of the heavy oil is improved.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, relates to a heavy oil flooding technology and application, and in particular relates to a reaction heat control method in a heavy oil in-situ exothermic reaction flooding process. Background technique [0002] Heavy oil resources are abundant and have great development value. However, due to its own characteristics, its mining and refining difficulty is far greater than that of conventional crude oil, the production cost is high, the recovery rate is low, and it needs diluent dilution or heating to be transported through pipelines, heavy oil upgrading and meeting environmental protection requirements. More investment and more advanced technical support are required. [0003] There are many methods of heavy oil recovery, including open-pit mining, sand production cold mining, steam huff and puff, solvent injection mining, etc. However, different heavy oil recovery technologies ha...

Claims

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Application Information

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IPC IPC(8): E21B43/24E21B43/241E21B43/22
CPCE21B43/24E21B43/241E21B43/16Y02P90/70
Inventor 吴青臧甲忠李福双薛同晖冯钰润郑修新范景新唐成义于瑞香
Owner CHINA NAT OFFSHORE OIL CORP
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