Dynamic gas well productivity forecasting method

A productivity forecasting and dynamic technology, applied in forecasting, instrumentation, data processing applications, etc., can solve the problems of increased development and testing costs, affecting gas well production, etc., and achieve the effects of saving manpower, great practical value and economic value, and accurate evaluation results

Active Publication Date: 2012-06-20
PETROCHINA CO LTD
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Problems solved by technology

However, repeated production test wells will increase the cost

Method used

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  • Dynamic gas well productivity forecasting method
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  • Dynamic gas well productivity forecasting method

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Embodiment Construction

[0016] see figure 1 , a gas well dynamic productivity prediction method provided by an embodiment of the present invention, comprising:

[0017] Step 1. Obtain the original open flow q of the gas well AOFi , original formation pressure p i and current formation pressure p m . Among them, the original open flow rate of the gas well q AOFi , original formation pressure p i It is tested before gas well production. The current formation pressure can be obtained by pressure gauge.

[0018] Step 2. Obtain the gas viscosity μ g and the coefficient of deviation Z.

[0019] natural gas viscosity μ g = 10 - 4 Kexp ( X ρ g Y ) , in,

[0020] K = 2.6832 × ...

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Abstract

The invention discloses a dynamic gas well productivity forecasting method. The method comprises the following steps: obtaining the initial open-flow potential qAOFi, initial formation pressure pi and current formation pressure pm of the gas well; obtaining the gas viscosity mu g and the deviation factor z; and forecasting the gas well productivity under the current formation pressure according to the obtained parameters. Starting with the theoretical formula of the gas well yield, the dynamic method for forecasting productivity in the gas well production process is provided in combination with the relevant empirical formulas on the premise of certain assumptions. The method has the following beneficial effects: the influence caused by formation pressure variation in the conventional productivity evaluation methods is eliminated; the evaluation results are more accurate and reliable; and application proves that the method is applicable, simple and convenient, repeated well testing is not needed, lots of manpower and money can be saved and the method has greater practical value and economic value.

Description

technical field [0001] The invention relates to the field of gas field development, in particular to a method for predicting the dynamic productivity of a gas well. Background technique [0002] Gas well productivity evaluation is a very important work and task in gas reservoir engineering research. It is an important content in the preparation of gas field development planning and deployment, development plan design, development dynamic analysis, gas well production allocation and development plan adjustment. [0003] As early as 1929, Pierce and Rawlinest of the U.S. Bureau of Mines proposed the conventional back pressure well test method to determine the productivity of gas wells, which has been widely used around the world. In 1955, Cullendert proposed the isochronous well test method for low-permeability gas reservoirs, which greatly improved the efficiency of gas reservoir productivity testing. In 1959, Katzt et al. The testing method and data analysis method have gre...

Claims

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Application Information

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IPC IPC(8): G06Q10/04G06Q50/06
Inventor 卢涛艾芳余淑明郭辉兰义飞张雅玲张建国刘志军何磊游良容伍勇朱长荣艾庆琳卞晓燕
Owner PETROCHINA CO LTD
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