Well test analysis method for diagnosing early-stage water invasion of edge water

An analysis method and technology of water intrusion, applied in the fields of earth-moving drilling, wellbore/well components, complex mathematical operations, etc., can solve the problems of gas well productivity loss, reducing gas reservoir recovery rate, increasing gas reservoir development, and mining difficulty, etc. , to achieve the effect of improving development efficiency

Active Publication Date: 2019-04-12
SOUTHWEST PETROLEUM UNIV +1
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Problems solved by technology

In the development process of edge water gas reservoirs, edge water intrusion will cause gas wells to produce water, which not only increases the difficulty of gas reservoir development and production, but also causes loss of gas well productivity, reduces gas reservoir recovery, and affects gas reservoir development benefits

Method used

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  • Well test analysis method for diagnosing early-stage water invasion of edge water
  • Well test analysis method for diagnosing early-stage water invasion of edge water
  • Well test analysis method for diagnosing early-stage water invasion of edge water

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Embodiment Construction

[0067] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

[0068] refer to Figure 1-11 , the present invention provides a technical solution:

[0069] The goal of the well testing analysis method for early water intrusion is to judge the existence of water influx, estimate the distance of water influx front and the range of water influx by means of well testing before the gas well breaks through water. The well test curve can reflect the change of the fluidity of the formation around the gas well. The fluidity of the water area is much lower than that of the gas area. The early water in...

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Abstract

The invention discloses a well test analysis method for diagnosing early-stage water invasion of edge water. The well test analysis method comprises the following steps: a gas well flowing area is subjected to area partition in a sectioned mode, and a multi-area seepage mathematical model is built; parameters of the multi-area seepage mathematical model are normalized; the multi-area seepage mathematical model is subjected to Laplace transformation; a single-well test interpretation model is built in a multi-area coupling mode, and a theoretical interpretation chart under the situation of tonguing water invasion of the edge water is obtained through calculation; a pressure drop typical curve and a double-logarithm pressure diagnosis curve are drawn; and whether early-stage water invasion exists in curve diagnosis or not is compared and analyzed. According to the well test analysis method, before a gas well encounters the water, by the means of well test, existence of water invasion isjudged, and the distance of the leading edge of water invasion and the area range of water invasion are estimated; and change of the formation flowing capacity of the periphery of the gas well can bereflected through the double-logarithm pressure diagnosis curve, the fluidity of a water area is much smaller than that of a gas area, and early-stage water invasion can be diagnosed through multi-time well test comparison and analysis.

Description

technical field [0001] The invention relates to the technical field of edge water gas reservoir development, in particular to a well testing analysis method for diagnosing early water invasion of edge water. Background technique [0002] The groundwater directly connected with the gas reservoir in the gas reservoir is called gas layer water. If the thickness of the gas layer is not large or the structure is steep, the gas fills the high part of the trap, and the water surrounds the periphery of the gas reservoir, this kind of water is called edge water. , this gas pool forms a side water gas pool. In the development process of edge water gas reservoirs, edge water intrusion will cause gas wells to produce water, which not only increases the difficulty of gas reservoir development and production, but also causes loss of gas well productivity, reduces gas reservoir recovery, and affects gas reservoir development benefits. Therefore, it is necessary to judge and diagnose the w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B47/00G06F17/50G06F17/10
CPCG06F17/10E21B47/00E21B49/00G06F30/20
Inventor 陈伟方全堂余燕欧家强阮基富唐仕谷袁权胡燕陈理捷
Owner SOUTHWEST PETROLEUM UNIV
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