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A Well Testing Analysis Method for Diagnosing Early Water Invasion of Edge Water

An analysis method and water intrusion technology, applied in earthwork drilling, wellbore/well components, measurement, etc., can solve the problems of gas well productivity loss, reduction of gas reservoir recovery rate, increase of gas reservoir development, difficulty of mining, etc., to achieve Improve development efficiency and high accuracy

Active Publication Date: 2022-04-22
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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  • A Well Testing Analysis Method for Diagnosing Early Water Invasion of Edge Water
  • A Well Testing Analysis Method for Diagnosing Early Water Invasion of Edge Water
  • A Well Testing Analysis Method for Diagnosing Early 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 testing analysis method for diagnosing early water intrusion of edge water, which comprises the following steps: dividing the flow area of ​​the gas well into regions by means of sectorization and establishing a multi-zone seepage mathematical model; Laplace transformation was performed on the multi-zone seepage mathematical model; a single well test interpretation model was established through multi-zone coupling, and the theoretical interpretation chart under the condition of edge water tongue ingress was obtained by calculation; Declining typical curve and double logarithmic pressure diagnostic curve; compare and analyze the above curves to diagnose whether there is early water intrusion. In the method of the present invention, before the gas well sees water, the existence of water invasion is judged by means of well testing, the distance of the water invasion front and the range of the water invasion are estimated, and the double-logarithmic pressure diagnostic curve of the present invention can reflect the formation flow around the gas well Due to the change of capacity, the mobility of the water area is much lower than that of the gas area, and the early diagnosis of water invasion can be realized through the comparison and analysis of multiple well tests.

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 Patents(China)
IPC IPC(8): E21B49/00E21B47/00G06F30/20G06F17/10
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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