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Application of in-situ combustion flue gas to oil deposit exploitation and system

A technology of burning oil beds and oil reservoirs, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of increased oil production operation costs, multiple ground spaces, etc., to improve single well oil production, surface Air quality improvement, enhanced distillation effect is obvious

Active Publication Date: 2015-04-22
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the ground needs to be equipped with high-pressure air compressors and reinjection pipelines, and the cost of oil production operations will increase accordingly, and the ground reinjection device will occupy more ground space at the same time

Method used

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  • Application of in-situ combustion flue gas to oil deposit exploitation and system
  • Application of in-situ combustion flue gas to oil deposit exploitation and system

Examples

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Embodiment 1

[0061] Attached below figure 1 The method for reinjecting flue gas from the combustion oil layer of the present invention is described in detail. In the figure, the oil layers 2 and 7 are divided into two sets of independent well patterns by the interlayer 3. The interlayer is well sealed, and the flue gas cannot break through the interlayer and rise to the upper part of the interlayer. The upper and lower wells are developed with two sets of well patterns respectively. The oil layer above the interlayer is developed by steam injection technology, and the oil layer below the interlayer is developed by fire technology. Fire-fired gas injection vertical well 1 is an air injection vertical well, through the ground high-pressure air injection pump 3 Inject air into oil layer 7 at / d speed. After air injection into the oil layer 7, the pressure is 4 MPa, and the combustion zone 6 advances toward the burning production well 8 at a rate of 3-10 cm / d per day. Behind the combustion z...

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Abstract

The invention provides an application of in-situ combustion flue gas to oil deposit exploitation and a system. According to oil deposit exploitation, the flue gas generated by in-situ combustion is reinjected into an adjacent oil reservoir of the in-situ combustion to achieve gas driving of the oil reservoir. Equipment at least comprises a fireflooding oil reservoir and a steam injection oil reservoir. The flue gas down-hole reinjection system comprises a casing pipe (21), a gas injection perforating pipe (22) and an oil-extraction oil pipe (23), wherein the gas injection perforating pipe (22) and the oil-extraction oil pipe (23) are arranged in the casing pipe side by side. A one-way valve (29) is arranged at the position, opposite to the bottom of the in-situ combustion, of the gas injection perforating pipe, and a hole (210) is formed in the position, opposite to the steam injection oil reservoir, of the gas injection perforating pipe. A gas-liquid separator (28) is arranged at the position, opposite to the bottom of the in-situ combustion, of the oil-extraction oil pipe. According to the application and the system, effective utilization of the flue gas is ensured, and the ground treatment and reinjection process is simplified; a flue gas injection target oil reservoir is effectively controlled, and therefore the production safety in the air injection process is ensured; due to oil reservoir flue gas driving, the recovery ratio of a heavy oil reservoir is increased, and the emission of greenhouse gas and poisonous gas is reduced.

Description

technical field [0001] The method belongs to the technical field of oil recovery in oilfields, and in particular relates to the application and system of flue gas from incineration oil layers in oil reservoir exploitation, which can increase the output of a single well, increase the utilization rate of heat energy in oil reservoirs, reduce the air pollution caused by flue gas, and increase the production capacity of heavy oil. Reservoir recovery and development effects. Background technique [0002] Domestic heavy oil production is mainly based on steam injection, and a large number of blocks are currently in the stage of low-efficiency production. Combustion oil layer technology is considered to be the most potential replacement technology due to its advantages of high-temperature cracking modification, heating viscosity reduction to improve crude oil flow capacity, high oil displacement efficiency, and low energy consumption. The current annual oil production has reached 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/243
CPCE21B43/168E21B43/24E21B43/243
Inventor 席长丰周游关文龙张学鲁杨凤祥陈龙施小龙师耀利
Owner PETROCHINA CO LTD
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