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Method for Identifying Water Breakthrough in Fractured Reservoirs

A reservoir and water breakthrough technology, which is applied in the field of identifying water breakthrough laws in fractured reservoirs, can solve problems such as difficulty in grasping water breakthrough laws in fractured reservoirs, unclear understanding of development laws, and difficulties in reservoir development. The method is simple, Easy to operate, solve unclear effects

Active Publication Date: 2019-03-08
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0002] For fractured reservoirs, due to formation stress extrusion, dissolution and weathering, etc., the development of fractures is anisotropic, and the development law is unclear, which makes it difficult to grasp the law of water breakthrough in fractured reservoirs. The development of

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  • Method for Identifying Water Breakthrough in Fractured Reservoirs
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  • Method for Identifying Water Breakthrough in Fractured Reservoirs

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Embodiment Construction

[0022] In order to make the above and other objects, features and advantages of the present invention more comprehensible, the preferred embodiments are listed below and shown in the accompanying drawings in detail as follows.

[0023] Such as figure 1 as shown, figure 1 It is a flow chart of the method for identifying the law of water breakthrough in fractured reservoirs of the present invention.

[0024] Step 101, obtaining relevant production data of production wells in the mine. Through the sampling and assay analysis of production wells in the mine, record the daily production data of the production well in fractured reservoirs, including production time (denoted as t), daily liquid production (denoted as Q l ) and daily oil production (denoted as Q o ). The process goes to step 102.

[0025] Step 102, generating daily water cut variation curves of production wells in fractured reservoirs. Calculate the daily moisture content (denoted as f w ), the formula is:

[...

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Abstract

The invention provides a method for recognizing the water breakthrough rule of a fractured reservoir. The method includes the steps of firstly, obtaining related production data of a mine production well; secondly, generating a daily water content variety curve of a fractured reservoir production well according to the related production data of the mine production well; thirdly, dividing water content variety stages of the fractured reservoir production well; fourthly, determining the included angle phi formed when regression equations of two adjacent water content variety stages intersect; fifthly, counting the range of the included angles phi formed by all different water content stages of the production well; sixthly, providing the range of the included angles phi during water breakthrough of the production well through the combination of geological information and experiences, and determining the water breakthrough time. The method is reasonable, accurate, simple and easy to operate, and the problem that the water logging time of an existing fractured reservoir production well can not be clearly learned is effectively solved.

Description

technical field [0001] The invention relates to the technical field of oil field development, in particular to a method for identifying the law of water breakthrough in fractured oil reservoirs. Background technique [0002] For fractured reservoirs, due to formation stress extrusion, dissolution and weathering, etc., the development of fractures is anisotropic, and the development law is unclear, which makes it difficult to grasp the law of water breakthrough in fractured reservoirs. development poses great difficulties. By identifying the water breakthrough law of fractured reservoirs, it is of great significance to effectively control the water breakthrough time of oil wells, control the water cut rise rate, adjust the injection-production well pattern, reduce the adverse impact of fractures on water injection development, and improve the development effect. For this reason, we invented a new method for identifying water breakthrough in fractured reservoirs, which solved...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/10G06F17/50
Inventor 李敬王伟曹刚吕世超张瑾季迎春崔晓朵邹建于忠友王筱文苗明庄绪超郭金城张华峰曹琦
Owner CHINA PETROLEUM & CHEM CORP
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