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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

Pending Publication Date: 2018-12-18
BC P INC CHINA NAT PETROLEUM CORP +2
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Problems solved by technology

However, the research on the water breakthrough time of bottom water condensate gas reservoirs is still in its infancy. Some scholars have deduced the water breakthrough time prediction model of bottom water condensate gas reservoirs by considering the influence of condensate oil precipitation, but the derivation process is The seepage model based on spherical convective flow does not consider the horizontal and radial flow of perforated intervals, which does not conform to the real seepage situation of gas wells; and the influence of gas phase non-Darcy effect and skin effect near the bottom of the well on water breakthrough time is ignored. These will lead to inaccurate prediction of water breakthrough time

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

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Embodiment

[0095] The basic parameters (actual production data) of a bottom water condensate gas reservoir are as follows: the original formation pressure is 44.37MPa, the gas reservoir temperature is 95.39°C, the gas phase viscosity is 0.034mPa·s, the water phase viscosity is 0.23mPa·s, the gas phase viscosity The density is 0.063g / cm 3 , the thickness of the gas layer is 190.31m, the perforation depth is 88.71m, the formation porosity is 0.186, the effective permeability of the gas layer is 175mD, the volume coefficient of condensate gas is 0.0043, the wellbore radius is 0.1m, the pressure relief radius is 250m, and the residual The gas saturation is 0.59, the residual condensate oil saturation is 0.44, the formation porosity is 0.16, the skin coefficient is 3, the initial water saturation is 0.56, and the average gas production of gas wells is 10.88×10 4 m 3 / d.

[0096] The new prediction model derived from the present invention and several commonly used models are used to calculat...

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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.

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...

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Application Information

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IPC IPC(8): G06F17/50E21B49/00
CPCE21B49/00G06F30/20
Inventor 明瑞卿贺会群胡强法熊革辛永安
Owner BC P INC CHINA NAT PETROLEUM CORP
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