A device for injecting coal powder into an oil layer and an ignition method for burning the oil layer

Abstract

The invention provides a device for injecting pulverized coal into an oil layer and an ignition method for in-situ oil combustion and belongs to the field of exploitation through in-situ oil combustion. The device for injecting the pulverized coal into the oil layer comprises an oil pipe arranged in an injection well or a production well, a pulverized coal spray-blowing system arranged on the ground and an injection pipeline, wherein the pulverized coal spray-blowing system is provided with a pulverized coal input port and a spray-blowing port, the spray-blowing port sprays out the pulverized coal, the injection pipeline is connected between the oil pipe and the spray-blowing port of the pulverized coal spray-blowing system, and the pulverized coal sprayed out of the spray-blowing port is delivered to the oil pipe. The device can improve the ignition effect for in-situ oil combustion and can also improve the development effect of the in-situ oil combustion.

Description

Technical field [0001] The invention belongs to the field of fired oil layer mining, and particularly relates to a device for injecting coal powder into the oil layer and an ignition method for the fired oil layer. Background technique [0002] At present, domestic oilfields often choose development methods such as steam flooding, SAGD or fire-burning reservoirs for how to improve the recovery rate of heavy oil reservoirs in the late stage of steam stimulation. [0003] The main process of the fire-burning oil layer development method is: continuous injection of combustion aid (air) from the injection well into the oil layer, and at the same time use the downhole igniter to ignite the oil layer (heated to the temperature at which the crude oil can spontaneously ignite) to burn, so that the nearby crude oil evaporates and Coking. The light oil vapor gradually flows outward with the combustion front until it is produced in the production well. Coking heavy hydrocarbons can continue...

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Problems solved by technology

Compared with foreign countries, there is a big gap in reservoir physical properties and applicability of incinerated oil reservoirs in heavy oil reservoirs developed in China, such as reduced oil saturation or even almost no oil in some places, increased water cut, and differences in permeability Larger, etc., these often lead to problems such as poor ignition effect, uneven fire line advancement, easy gas channeling, poor combustion effect of the oil layer or even low-temperature combustion during the development of the oil layer by fire, which greatly affects the development effect of the oil layer by fire

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