Method and a device for predicting water breakthrough time of a bottom water condensate gas reservoir

A technology for condensate gas reservoir and time prediction, which is applied to earth-moving drilling, wellbore/well components, instruments, etc., can solve the problem of horizontal and radial flow in the perforated interval, not in line with the real seepage situation of gas wells, and water breakthrough. Inaccurate time prediction and other problems to achieve the effect of improving accuracy
CN109033518APending Publication Date: 2018-12-18BC P INC CHINA NAT PETROLEUM CORP +2
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
BC P INC CHINA NAT PETROLEUM CORP
Publication Date
2018-12-18

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Abstract

The invention provides a method and a device for predicting water breakthrough time of a bottom water condensate gas reservoir. The method comprises the following steps: based on the factors of skin effect, gas non-Darcy effect and retrograde condensation, the calculation model of water breakthrough time of bottom water condensate gas reservoir is established based on the gas plane radial abortionenergy model of perforated interval and the gas hemispherical centripetal abortion energy model of the lower part of perforated interval; actual production data of bottom water condensate gas reservoir are obtained. Based on the water breakthrough time calculation model of the bottom water condensate gas reservoir, the water breakthrough time of the bottom water condensate gas reservoir is predicted according to the actual production data of the bottom water condensate gas reservoir. Because the influence of non-Darcy effect, skin effect and retrograde condensation on water breakthrough timenear the bottom hole is considered comprehensively in this scheme, the water breakthrough time calculation model which is more suitable for the water cone behavior of bottom water condensate gas reservoir can be established, and the accuracy of water breakthrough time prediction can be improved.
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Description

technical field

[0001] The invention relates to the technical field of water breakthrough risk prediction of natural gas wells, in particular to a method and device for predicting water breakthrough time of bottom water condensate gas reservoirs. Background technique

[0002] During the exploitation of condensate gas reservoirs, when the formation pore pressure decreases to the dew point pressure, liquid condensate oil will be formed in the formation, and the formation is a three-phase flow of oil, gas and water, which makes the seepage process more complicated. Since liquid condensate oil exists in bottom water condensate gas reservoirs, the dynamics of bottom water coning is different from that of conventional bottom water gas reservoirs. If the water breakthrough time calculation model of conventional water-producing gas reservoirs is used for prediction, it will inevitably lead to errors or even errors in the prediction results. At present, there are many studies on the...

Claims

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