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Fire flooding oil extraction crude oil combustion-assistant ignition process

A process method and crude oil technology, applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve the problems of heater temperature burnout, uneven air absorption, low ignition success rate, etc., and achieve the ignition cycle. Short, beneficial to production operation, high ignition success rate

Inactive Publication Date: 2008-02-13
LIAOHE GASOLINEEUM EXPLORATION BUREAU
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AI Technical Summary

Problems solved by technology

Among them, the heater method uses a cable to send the heater into the oil well to heat the injected air. This method has the disadvantage that the injected air cannot fully contact the heater, often resulting in uneven heat absorption by the air, and sometimes causing the heater to burn out due to excessive temperature. The phenomenon of the heater; although the chemical method is successful in thermal flooding of the oil layer, the success rate of ignition is very low for heavy oil reservoirs; the steam injection ignition method is to inject a large amount of steam above 350 ℃ through the oil well, and then inject it into the well The disadvantage is that it takes a long time to reach the threshold temperature

Method used

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Examples

Experimental program
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specific Embodiment approach

[0012] Specific implementation method: Take a fire flooding oil recovery injection construction well group in Block Du 48 of Liaohe Oilfield as an example.

[0013] The well group is located in Block Du 48 of Liaohe Oilfield. The development layer is the Dujiatai oil layer in Shasan. The well group controls geological reserves of 72×10 4 t, the recovery degree is 23%, the thickness of the oil layer is 10.1m, and the buried depth of the oil layer is 950-1020m. At present, the formation pressure is 1.1-1.5MPa, and the formation temperature is 53°C.

[0014] According to the above implementation steps, the well was subjected to fire flooding and oil displacement construction for the oil layer of the heavy oil well, and the necessary partial oil layer plugging was carried out before construction. Then, first inject 280m 3 High-temperature steam (steam dryness 85%, temperature 330°C, steam injection speed 23t / h), in the late stage of steam injection (about 240m 3 time), about 10t...

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Abstract

The invention relates to a crude oil assisted combustion and ignition technique for the fire flooding oil exploitation. With the techniques, high-temperature steam and a combustion additive mainly comprising platinum, palladium and other metal are injected into an oil layer through an injection well, so as to enter a normal ignition course more quickly. The ignition techniques can be implemented easily, the ignition period is short, and the ignition success rate is high. With the techniques, the ignition course can be completed smoothly within a shorter time, which is favorable for the production and operation of fire flooding oil exploitation.

Description

Technical field: [0001] The invention relates to an ignition process method used in oil fields, especially heavy oil oil fields, and belongs to the fire-flooding oil recovery process technology. Background technique: [0002] Fire flooding is a method of oil layer displacement and crude oil extraction in the process of oilfield exploitation. It is to establish a well group or a well row consisting of an injection well and multiple production wells around it on the existing well network as injection wells, Adjacent wells are arranged as a determinant well pattern of production wells. Air and high-temperature steam are injected into the injection wells to heat the air downhole to a temperature that can ignite crude oil, or the oil layer can be burned by natural oxidation of air and crude oil in the oil layer to generate heat. The temperature (threshold temperature) process enables the oil layer to be burned underground. The underground combustion process burns a part of the cr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/243
Inventor 宁奎朱玉瑰孙希勇张成军张弘韬陈亚平
Owner LIAOHE GASOLINEEUM EXPLORATION BUREAU
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