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Oil-gas reservoir physical simulation wellbore radius processing method

A wellbore radius and physical simulation technology, applied in earthwork drilling, wellbore/well components, etc., can solve problems such as effective wellbore radius processing methods that have not yet been found

Active Publication Date: 2013-08-21
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Claims
  • Application Information

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Problems solved by technology

At present, for the physical simulation of the reservoir development process of constant pressure production of injection and production wells, no effective wellbore radius processing method has been found

Method used

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  • Oil-gas reservoir physical simulation wellbore radius processing method
  • Oil-gas reservoir physical simulation wellbore radius processing method
  • Oil-gas reservoir physical simulation wellbore radius processing method

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Embodiment Construction

[0015] method principle

[0016] The main idea of ​​the present invention is to replace the small-radius wellbore with a larger-radius wellbore in the physical model according to the principle of seepage mechanics, and at the same time select a suitable injection-production pressure difference, so that the experimental model can not only solve the problem caused by the too small radius of the wellbore, but also It can conform to the characteristics and rules of the flow field in the reservoir.

[0017] Such as figure 1 As shown, according to the principle of near-well seepage pressure drop funnel, when a well in the center of the circular constant pressure supply boundary produces constant pressure, all isobars are circular, and the wellbore itself is also a circle of isobars. In the same seepage medium, according to the circular supply boundary pressure and the wellbore pressure, the pressure distribution between the supply boundary and the wellbore can be determined. When ...

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Abstract

The invention relates to an oil-gas reservoir physical simulation wellbore radius processing method. In the processing method, the equivalent processing of the wellbore radius is realized by utilizing a near-well seepage pressure drop funnel theory and a constant-pressure constant liquid quantity principle, a large-radius wellbore is used in a physical model instead of a small-radius wellbore, and a proper injection / production pressure difference is selected at the same time, so that an experimental model not only can solve the problems caused by undersize wellbore radius, but also can conform to the characteristics and law of the flow field in the oil reservoir. The invention provides a technique, and the similarity equivalent processing of the wellbore radius is realized by utilizing the near-well seepage pressure drop funnel theory and the constant-pressure constant liquid quantity principle, so that the wellbore radius of the model is possibly similar to that of the oil reservoir in the oil-reservoir multi-well constant-pressure production physical simulation.

Description

technical field [0001] The invention belongs to a new type of physical experiment method for the physical simulation research of oil and gas reservoir development, and is also applicable to other research fields related to the seepage phenomenon of the wellbore in the porous medium. Background technique [0002] In the study of physical simulation of reservoirs, people have been trying to use laboratory models to simulate reservoirs according to a certain similarity. The laboratory model should first satisfy geometric similarity, that is, the model is geometrically similar to the actual reservoir. In actual reservoir development, the area injection-production unit is often larger than 10×10 4 m 2 , the wellbore radius is about 5-10cm. However, the laboratory model area injection-production unit generally does not exceed 2m 2 , according to geometric similarity, the wellbore radius shall not exceed 0.5mm. For such a small well diameter, the friction effect will seriously...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00
Inventor 丁祖鹏刘月田屈亚光涂彬
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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