A thermal recovery string and oil recovery method thereof

A pipe string and thermal recovery technology, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of high comprehensive water cut, low efficiency, strong heterogeneity of reservoir, etc., and achieve uniform injection Effect

Active Publication Date: 2022-03-08
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] At present, the main problems in the thermal recovery of heavy oil are: high round throughput, poor production effect; high comprehensive water cut, low recovery degree; many interlayers in the reservoir, strong reservoir heterogeneity
[0006] However, the existing tools and methods are still not efficient in the thermal recovery of heavy oil. After summarizing, there are two main reasons: one is that the steam is injected into the formation unevenly, and the other is that the steam injected and the heavy oil flow into the wellbore through the same channel, and the circulation range small, less active

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  • A thermal recovery string and oil recovery method thereof
  • A thermal recovery string and oil recovery method thereof
  • A thermal recovery string and oil recovery method thereof

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Embodiment Construction

[0052] In order to make the technical solutions and advantages of the present invention clearer, the exemplary embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Apparently, the described embodiments are only a part of the embodiments of the present invention, and are not exhaustive of all the embodiments. And in the case of no conflict, the embodiments and the features in the embodiments of the present invention can be combined with each other.

[0053] After many times of practice and tests, the inventor concluded that there are two major reasons for the low thermal recovery efficiency of heavy oil: one is that the steam is not uniformly injected into the formation, and the other is that the injected steam and the heavy oil flow into the wellbore through the same channel, and there is a circulation range Small and low utilization.

[0054] In view of the above deficiencies, the embodiments of the pre...

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Abstract

The invention proposes a thermal recovery string and an oil recovery method thereof. The thermal recovery string includes: oil pipes arranged in the wellbore; Both sides of holes or screen seams; heat-sensitive oil production valves, which are set on the tubing for oil production, corresponding to the casing perforations or screen seams on the wellbore; and heat-sensitive injection valves, which are used to inject steam, The heat-sensitive injection valve is arranged behind the heat-sensitive oil production valve and arranged alternately with the heat-sensitive oil production valve in the horizontal section of the tubing, corresponding to the area of ​​casing perforation or screen seam. The thermal recovery string can improve the development degree of heavy oil reservoirs.

Description

technical field [0001] The invention belongs to the technical field of petroleum development, and in particular relates to a thermal recovery pipe string and an oil recovery method for improving the development degree of heavy oil reservoirs. Background technique [0002] Heavy oil (heavy crude oil) refers to degassed crude oil with a viscosity of 100-1000mPa·s at the original reservoir temperature or a density of 0.9340-1.0000g / cm at 15.6°C and atmospheric pressure 3 . Heavy oil accounts for about 60% of the total petroleum resources. Due to the high viscosity of heavy oil, conventional oil recovery methods are difficult to develop, and downhole refueling must be carried out to reduce the viscosity before oil recovery. At present, the main method of thermal recovery is to inject high-temperature steam into the heavy oil reservoir, heat the heavy oil through heat conduction to reduce the viscosity, and then pump the heavy oil to the ground. [0003] At present, the main p...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/24E21B34/06
CPCE21B43/24E21B34/06
Inventor 杨顺辉王钧郑德帅王卫明牛成成何汉平李梦刚豆宁辉
Owner CHINA PETROLEUM & CHEM CORP
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