Device for injecting pulverized coal into oil layer and ignition method for in-situ oil combustion

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 burning oil layer exploitation, and in particular relates to a device for injecting coal powder into an oil layer and an ignition method for burning an oil layer. Background technique [0002] At present, domestic oilfields often choose development methods such as steam flooding, SAGD or burning oil layers to improve the recovery factor in the later stage of steam huff and puff in heavy oil reservoirs. [0003] The main process of the fire oil layer development method is: continuously inject a combustion aid (air) from the injection well into the oil layer, and at the same time use a downhole igniter to ignite the oil layer (heat to the temperature at which the crude oil can spontaneously ignite) to burn, so that the nearby crude oil evaporates and burns. coking. The light oil vapor gradually flows outward along with the combustion front until it is produced in the production well. Coked heavy hydrocarbons can co...

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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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