An injection composition for self-generating heat of crude oil underground catalytic oxidation

Abstract

The invention provides an authigenic heat injection composition for underground catalytic oxidation of crude oil. The injection composition is a three-phase stable disperse system composed of water phase (anionic surfactant), an auxiliary agent, solid phase (nano-catalyst) and gas phase (air); the injection composition comprises the following raw materials: 0.1-1% of anionic surfactant taken as water phase, 0.1-1% of auxiliary agent, 0.1-1% of nano-catalyst taken as solid phase, and the balance of water, wherein the sum of the mass percent of the water phase, the auxiliary agent, the solid phase and the water is 100%; the volume ratio of the adding amount of the air to the total amount of the water phase, the auxiliary agent, the solid phase and the water is (3-7): 1. After the injection composition is adopted, the sweep efficiency of the air can be improved, the synchronous carrying of the catalyst and the air can be realized, and the problem of separation of underground air and catalyst can be avoided; the composition contains the efficient nanometer oxide catalyst, and the crude oil can be catalyzed to have oxidation reaction under the mild conditions, and therefore the problem that the stratum is blocked by coking caused by severe oxidation reaction is effectively avoided.

Description

technical field

[0001] The invention relates to an injection composition used for self-generating heat of underground catalytic oxidation of crude oil, and belongs to the technical field of petroleum development. Background technique

[0002] In the process of oilfield development, viscosity reduction of crude oil is one of the main technical approaches to enhance oil recovery. Heavy oil, ultra-heavy oil reservoirs and old oil fields that have undergone long-term water flooding are not easy to recover because of the characteristics of high polarity and high viscosity in the remaining oil, and the production cost will also increase. At this time, it is necessary to adopt viscosity reduction technology To achieve economical and effective mining. Currently available viscosity reduction mining technologies include: steam injection for viscosity reduction, thinning for viscosity reduction, emulsification for viscosity reduction, and air injection for viscosity reduction. As oil...