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A kind of oil recovery method of heavy oil reservoir

A heavy oil reservoir and formula technology, which is applied in the field of heavy oil reservoir oil production, can solve the problem of high cost of oil production measures, and achieve the effects of low cost of measures, simple construction technology and high success rate

Active Publication Date: 2011-12-21
PETROCHINA CO LTD
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Problems solved by technology

In this case, the development method of the oil field needs to be changed, but the cost of fully implementing oil recovery measures is high

Method used

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  • A kind of oil recovery method of heavy oil reservoir
  • A kind of oil recovery method of heavy oil reservoir
  • A kind of oil recovery method of heavy oil reservoir

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Embodiment Construction

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0021] Such as figure 1 As shown, the present invention provides a method for oil recovery in heavy oil reservoirs, the method is called "2+3" oil recovery method, the method includes:

[0022] Step S101: Gel system profile control step: configure the composition of the pre-slug formula to be 0.25% polymer + 0.05% cross, configure the composition of the main slug formula to be 0.2% polymer + 0.05% cross, inject the gel system first Set the slug, and then inject the main slug of the gel system.

[0023] Step S102: Displacing step: the pre-slug is equipped with 0.4% o...

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Abstract

The invention provides an oil extraction method for a heavy oil reservoir, which comprises the following steps: gel system profile control: configuring the composition of a front section plug formula to be 0.25%+0.05% of polymer (focusing ratio), configuring the composition of a main section plug formula to be 0.2%+0.05% of polymer (focusing ratio), firstly filling into a front section plug of a gel system, and then filling into a main section plug of the gel system; profile control: configuring 0.4% of oil displacement agent for a front section plug, configuring 0.25% of oil displacement agent for the main section plug, firstly filling into a front section plug of the oil displacement agent, and then filling into a main section plug of the oil displacement agent; water injection; and conversion. The oil extraction method for the heavy oil reservoir, which is disclosed by the invention, has the advantages of simple construction technology, high control and blocking success rate, big dewatering and oil increase amplitude and low measure cost. A construction scheme is flexibly made by aiming at the variation of the injection and extraction relationship, the plugging success rate is improved, residual oil is displaced by the self energy of edge water, the spreading volume is expanded, and scavenging area and oil field recovery ratio are improved.

Description

technical field [0001] The invention relates to oil recovery technology in oil reservoirs, in particular to a method for oil recovery in heavy oil reservoirs. Background technique [0002] After full-scale water injection development of some heavy oil reservoirs, due to the strong heterogeneity, the injected water has serious tongue and fingering phenomena, resulting in a rapid rise in water content, causing most of the oil wells to be flooded. Conventional water flooding The effect of single profile control and water plugging measures will be significantly worse, and the oil production will drop rapidly, from the highest 270t / d to 23t / d. In this case, the development method of the oil field needs to be changed, but the cost of fully implementing oil recovery measures is high. [0003] Therefore, there is an urgent need for a heavy oil reservoir oil recovery method that can reduce the cost of measures and improve the water injection development effect and recovery rate of t...

Claims

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Application Information

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IPC IPC(8): E21B43/22E21B43/20
Inventor 唐纪云韩树柏汪小平王希芹李铁栓杨开陈志会刘霞吕晓凤李剑张红梅杨丽妍杨婉玲
Owner PETROCHINA CO LTD
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