Abstract
Conventional heavy oil has abundant reserves and low recovery efficiency in offshore oilfields. Autogenous heat technology uses 2-3 kinds of inorganic salt solution to produce inert gas and release a lot of heat under the action of a catalyst. It is applied to improve heavy oil recovery of the offshore oilfield. This paper applies experimental schemes such as viscosity reduction rate evaluation, heat conditions, gas production conditions, reaction rate control, and effect of environmental factors. This paper evaluates the performance of the autogenous heat system, optimizes the process parameters, and designs the process scheme and construction scheme according to the oil well production. This paper researches an autogenous heat system with nontoxic and high heat production and optimizes the catalyst type, concentration, and time to reach exothermic peak. When the concentration of the thermogenic agent is 1.5 mol/L in the autogenous heat system, the range of temperature rise is 67°C, which achieves the target requirement of more than 50°C. Field application shows that the autogenous heat system can effectively reduce the viscosity of heavy oil, dissolve solid paraffin, clean organic scale, improve reservoir permeability, and increase heavy oil production. This paper applies autogenous heat technology to improving the efficiency of heavy oil recovery of the offshore oilfield. Research conclusions show that the autogenous heat system can effectively reduce the viscosity of heavy oil, improve reservoir permeability, and increase heavy oil production.
Highlights
IntroductionThe principle of heat generation is mixing 2-3 kinds of inorganic saline solution, with catalysis; the exothermic chemical reaction occurs to produce inert gases and generate a large amount of heat [1]
Autogenic heat technology originated from an invention patent of the Shell Company
Heavy oil thermochemical synergistic technology is relatively mature in onshore oilfields [3, 4], but compared with an onshore oilfield, an offshore oilfield has its particularity, so it is necessary to carry out thermochemical synergistic technology research according to the characteristics of the offshore oilfield [5]
Summary
The principle of heat generation is mixing 2-3 kinds of inorganic saline solution, with catalysis; the exothermic chemical reaction occurs to produce inert gases and generate a large amount of heat [1]. The autogenic heat system releases a large amount of heat after reacting in the reservoir, which can increase the reservoir temperature and reduce the viscosity of crude oil. At the same time, increasing the oil fluidity of reservoirs by chemical viscosity reduction and the reaction products have no effect on the formation [2]. Autogenic heat technology is mainly used in high viscosity and high pour point reservoirs. According to the existing offshore process conditions, it is an attempt to develop offshore heavy oil by using autogenic heat chemical synergistic technology with less investment and quick response. Heavy oil thermochemical synergistic technology is relatively mature in onshore oilfields [3, 4], but compared with an onshore oilfield, an offshore oilfield has its particularity, so it is necessary to carry out thermochemical synergistic technology research according to the characteristics of the offshore oilfield [5]
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