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Improved steam-flood oil recovery method

A technology of steam flooding and steam, which is applied in chemical instruments and methods, production fluids, earth drilling and production, etc. It can solve the problems of short half-life of oil displacement effect and unfavorable heavy oil collection, etc., so as to reduce steam injection speed and improve heat resistance , to reduce the effect of diffusion

Inactive Publication Date: 2017-05-31
臧继虎
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Problems solved by technology

However, the oil displacement agent used in this method is combined with the oil layer faster, and the half-life of the oil displacement effect is shorter, so it is necessary to use a large-flow injection method when injecting, and this injection method will cause the oil layer to move further. Deep underground diffusion is not conducive to the collection of heavy oil

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specific Embodiment approach

[0023] A specific embodiment of the invention comprises the following steps:

[0024] A. Inject steam into the injection well to build a steam cavity in the oil layer, and stew the well for 3 days;

[0025] B. The production well was put into production for 6 hours. During the production process of the production well, the mixture of steam and diluent was injected into the injection well synchronously, and then the well was soaked for 12 hours again; the above process was repeated 3 times;

[0026] C. Inject the mixture of steam and anti-coagulation agent into the production well, and resume production after 10 hours of simmering.

[0027] The diluent comprises the following components in parts by weight,

[0028] 22 parts of 2,2,2-trifluoroethyl methyl ether, 11 parts of p-chloroacetanilide, 5 parts of 2-thiophene methyl mercaptan, 1 part of 2',5'-dihydroxypropiophenone, 15 parts of 2-ethylbromobutane, 12 parts of 3-fluoro-o-xylene, 9 parts of trans-2,4-decadienal.

[0029...

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Abstract

The invention discloses an improved steam-flood oil recovery method. The method includes steps: A, injecting steam into an injection well to establish a steam chamber layer in an oil layer, and shutting in the well for 2-3 days; B, opening a production well to produce for 5-8h, synchronously injecting a mixture of steam and diluents into the injection well in a production process of the production well, then shutting in the well again for 12h, and repeating the process for 2-3 times; C, injecting a mixture of steam and condensation inhibitors into the production well, shutting in the well for 8-12h, and recovering production. The improved steam-flood oil recovery method has advantages that defects in the prior art can be improved, and thickened oil layer exploitation effects of the steam-flood method are improved.

Description

technical field [0001] The invention relates to the technical field of oil recovery, in particular to an improved steam flooding oil recovery method. Background technique [0002] In recent years, with the increasing demand for oil and the decreasing production of conventional crude oil, the development of heavy oil is deepening year by year. Heavy oil recovery is dominated by thermal oil recovery, mainly including steam huff and puff, steam flooding, and burning oil layers. Among them, steam flooding is to continuously inject high-dryness steam into the oil layer from the injection well to heat the oil layer through the injection-production well pattern, and drive the heavy oil around the production well to be recovered. high. In addition, steam flooding, as the main means of improving oil recovery after steam huff and puff, has been applied on a large scale in foreign countries, and the recovery rate has increased significantly. However, the characteristics of domestic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24E21B43/22C09K8/592
CPCC09K8/592E21B43/16E21B43/24
Inventor 臧继虎王磊孙莉莉张春荣李琪高德海黄海峰马兰梅郝君俞嘉欢李艳马杰李晓明年菁
Owner 臧继虎
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