A method for well testing determination of carbon dioxide displacement front
A technology of carbon dioxide and determination method, which is applied in earth-moving drilling, wellbore/well components, and production fluids, etc., can solve the problem of difficulty in determining the displacement front, and achieve the effect of improving accuracy
Active Publication Date: 2019-04-09
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
[0002] In the process of carbon dioxide displacement, due to the diffusion of mixture components, temperature and viscosity changes in the process of carbon dioxide and crude oil miscibility, as well as the characteristics of formations and injection wells, it is difficult to determine the displacement front, and there is no carbon dioxide displacement front. Determining the well testing method proposed
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[0034] In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are listed below and described in detail in conjunction with the accompanying drawings.
[0035] like figure 1 as shown, figure 1 It is a flow chart of the well testing determination method for carbon dioxide displacement front of the present invention.
[0036] In step 101, a complete and realistic well test interpretation model is established, including a reservoir model and a seepage mathematical model (shown in formulas 1-4):
[0037]
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[0040]
[0041] Among them, φ porosity; x u is the mole fraction of component u in the oil phase; y u is the mole fraction of component u in the gas phase; s o is oil saturation; s g is the gas saturation; is the molar mass flow per unit volume of component u; p l is the phase pressure; p i is the original formation pressure; k is the absolute permeability of ...
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The invention provides a well testing determination method for the carbon dioxide displacement front. The well testing determination method includes the steps that 1, well testing interpretation models are built and include a reservoir model and a seepage flow mathematical model; 2, the well testing interpretation models are solved numerically through pressure equation linearization; 3, according to the basic reservoir physical property test data, an analogy method is used for solution through basic well testing interpretation parameters to obtain pressure data in the pressure drawdown / recovery well testing process, and the pressure data are processed to obtain pressure and pressure semilogarithm or double logarithmic curves; 4, practical pressure and pressure semilogarithm or double logarithmic curves are fitted through the obtained result to calculate a target function value; 5, the carbon dioxide displacement front is determined according to the parameters obtained in the step 4 and a relational expression for solving the carbon dioxide displacement front. In the method, various physical property changes in the carbon dioxide displacement process and own characteristics of the stratum and injection wells are considered, and the accuracy of determining the carbon dioxide displacement front is improved.
Description
technical field [0001] The invention relates to the technical field of oilfield development, in particular to a method for determining the well test of a carbon dioxide displacement front. Background technique [0002] In the process of carbon dioxide displacement, due to the diffusion of mixture components, temperature and viscosity changes in the process of carbon dioxide and crude oil miscibility, as well as the characteristics of formations and injection wells, it is difficult to determine the displacement front, and there is no carbon dioxide displacement front. Determine the well testing method proposed. For this reason, we have invented a new method for determining the carbon dioxide displacement front, which solves the above technical problems. Contents of the invention [0003] The purpose of the present invention is to provide a method for determining the carbon dioxide displacement front by taking into account various changes in physical properties and the char...
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IPC IPC(8): E21B43/22
CPCE21B43/164
Inventor 杨勇韩凤蕊李友全张奎祥于伟杰阎燕王杰李弘博赵辉薛元真高安邦徐乐顾辉亮肖琨王明王丽娜
Owner CHINA PETROLEUM & CHEM CORP