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Oil displacement agent assisted steam flooding oil extraction method

An auxiliary steam and oil displacement agent technology, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problem of affecting the recovery rate of steam flooding, the inability to recover crude oil, and the limited range of expansion of the steam zone, etc. problems, to achieve the effect of enhanced oil recovery

Inactive Publication Date: 2015-09-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of pure steam flooding, the temperature of the reservoir gradually decreases from the steam injection well to the production well. According to the temperature change, the reservoir is generally divided into three zones (steam zone, hot water zone, and original temperature reservoir). zone), the steam zone has the highest temperature, can form a steam cavity, and has the highest oil displacement efficiency, but the expansion range of the steam zone is limited. The temperature of the zone is lower than that of the steam zone, and the steam cavity cannot be formed. The steam injected from the steam injection well gradually condenses into hot water after passing through the steam zone. The efficiency is significantly lower than that of steam, resulting in a large amount of residual crude oil in the hot water zone that cannot be recovered underground, affecting the recovery factor of the entire steam flooding

Method used

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  • Oil displacement agent assisted steam flooding oil extraction method

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Experimental program
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Effect test

Embodiment 1

[0017] The viscosity of crude oil in the heavy oil reservoir is 500mPa.s, the buried depth of the oil layer is 900m, the degree of salinity is 6000mg / L, the permeability of the formation is 1800 mD, and the effective thickness of the oil layer is 8m.

[0018] (1) First mix high temperature resistant oil displacement agent and water to form a solution containing high temperature resistant oil displacement agent with a concentration of 300000mg / L;

[0019] (2) In the process of steam flooding in heavy oil reservoirs, the high-temperature oil-displacement agent solution is periodically injected into steam injection wells, and oil production is carried out in production wells. The steam injection rate is 1.6 tons / day. per hectare. per meter thickness, the injection rate of the high temperature resistant oil displacement agent solution is 1.2 tons / day, the injection cycle of the high temperature resistant oil displacement agent solution is 10 days, and the injection of the high temp...

Embodiment 2

[0021] The viscosity of crude oil in the heavy oil reservoir is 1000mPa.s, the buried depth of the oil layer is 1200m, the degree of salinity is 18000mg / L, the permeability of the formation is 1800mD, and the effective thickness of the oil layer is 10m.

[0022] (1) First mix high temperature resistant oil displacement agent with water to form a solution containing high temperature resistant oil displacement agent with a concentration of 60000mg / L;

[0023] (2) In the process of steam flooding in heavy oil reservoirs, the high-temperature oil-displacement agent solution is continuously injected into steam injection wells, and oil production is carried out in production wells. The steam injection rate is 1.6 tons per day. per hectare per meter thickness, and the injection rate of high temperature oil displacement agent solution is 0.5 tons per day.

Embodiment 3

[0025] The viscosity of crude oil in the heavy oil reservoir is 2000mPa.s, the buried depth of the oil layer is 1000m, the degree of salinity is 20000mg / L, the permeability of the formation is 1500 mD, and the effective thickness of the oil layer is 12m.

[0026] (1) First mix high temperature resistant oil displacement agent with water to form a solution containing high temperature resistant oil displacement agent with a concentration of 200000mg / L;

[0027] (2) In the process of steam flooding in heavy oil reservoirs, the high-temperature oil-displacement agent solution is periodically injected into steam injection wells, and oil production is carried out in production wells. The steam injection rate is 1.8 tons / day. per hectare. per meter thickness, the injection rate of the high temperature resistant oil displacement agent solution is 0.6 tons / day, the injection cycle of the high temperature resistant oil displacement agent solution is 30 days, and the injection of the high...

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Abstract

The invention discloses an oil displacement agent assisted steam flooding oil extraction method. The method comprises steps of preparing a solution of the high temperature resistant oil displacement agent and water, wherein the concentration of the high temperature resistant oil displacement agent is 30000 to 400000 mg / L, continuously or periodically injecting the solution of the high temperature resistant oil displacement agent into a steam injection well when a heavy oil reservoir is under steam flood. The burial depth of the heavy oil reservoir is 900 to 1600 m, the effective thickness of the oil reservoir is greater than or equal to 8 m, the viscosity of crude under the condition of the oil reservoir is greater than 100 mPa.s, and the mineralization of stratum water is lower than 50000 mg / L. The high temperature resistant oil displacement agent is sulfonate containing aromatic groups. The injection speed of the high temperature resistant oil displacement agent is 0.5 to 2.4 ton / day. The period that the solution of the high temperature resistant oil displacement agent is injected for 5 to 30 days, and injection of the solution of the high temperature resistant oil displacement agent is stopped for 60 to 90 days. Aiming at the technical background that the hot water belt displacement efficiency is low during simple steam flood, the oil displacement agent assisted steam flooding oil extraction method is provided to effectively raise the hot water belt displacement efficiency, so that the steam flooding recovery efficiency of a heavy oil reservoir can be raised.

Description

technical field [0001] The invention relates to an oil recovery technology in an oil field, in particular to a method for oil recovery by steam flooding assisted by an oil displacement agent. Background technique [0002] Steam flooding technology refers to the continuous injection of steam through steam injection wells under certain well pattern conditions. The steam in the ground is not only the energy source for heating the oil layer, but also the medium for displacing crude oil, and the surrounding oil wells produce at a certain output. Steam flooding is an effective means to enhance the recovery of heavy oil reservoirs. It has become a large-scale industrial application of thermal recovery technology in foreign countries, and the range of enhanced recovery is relatively obvious. However, in the process of pure steam flooding, the temperature of the reservoir gradually decreases from the steam injection well to the production well, and the reservoir is generally divided ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24
Inventor 毕义泉吴光焕李伟孙建芳孙业恒李伟忠赵红雨唐亮刘西雷陈明铭邓宏伟王一平李洪毅赵衍彬王传飞
Owner CHINA PETROLEUM & CHEM CORP