Well test interpretation method of horizontal well for thickened oil thermal recovery

A technology for thermal recovery and well testing interpretation of heavy oil, which is applied in wellbore/well components, production fluids, earth-moving drilling, etc. It can solve problems such as difficulty in solving mathematical models and unreasonable simplification of thermal recovery composite models for horizontal wells.

Inactive Publication Date: 2013-06-19
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

[0005] The main purpose of the embodiments of the present invention is to provide a well test interpretation method for thermal recovery of heavy oil horizontal wells t

Method used

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  • Well test interpretation method of horizontal well for thickened oil thermal recovery
  • Well test interpretation method of horizontal well for thickened oil thermal recovery
  • Well test interpretation method of horizontal well for thickened oil thermal recovery

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Embodiment 1

[0027] This embodiment provides a method for well test interpretation of heavy oil thermal recovery horizontal wells, such as figure 1 As shown, the method includes:

[0028] Step S11, according to the subsurface fluid and thermal field distribution characteristics of the heavy oil horizontal well, using a time-varying line source composite well testing model;

[0029] Step S12, constructing a line source function according to the time-varying line source composite well test model;

[0030] Step S13, selecting a plate source function according to the boundary conditions of the heavy oil horizontal well;

[0031] Step S14, superimposing the line source function and the plate source function to obtain a horizontal well source function for thermal recovery of heavy oil;

[0032] Step S15, obtaining the Laplace space solution of the bottomhole pressure function of the non-well storage from the horizontal well source function of heavy oil thermal recovery;

[0033] Step S16, obt...

Embodiment 2

[0246] This embodiment provides a specific application process of well test interpretation for heavy oil horizontal wells according to the well test interpretation method for heavy oil thermal recovery horizontal wells in Embodiment 1, as follows Figure 7 shown, including:

[0247] Step S71, input basic data;

[0248] Step S72, according to the well test interpretation method of the thermal recovery horizontal well of heavy oil in the first embodiment, by adjusting the key parameters, calculating the theoretical pressure and the theoretical pressure derivative curve;

[0249] Step S73, using the theoretical pressure and the theoretical pressure derivative curve to fit the measured pressure and the pressure derivative curve;

[0250] Step S74, obtaining reservoir parameters according to the fitting results.

[0251] Among them, the basic data include geological layering of test wells, logging interpretation data, multivariate thermal fluid parameters, fluid physical properti...

Embodiment 3

[0261] This embodiment is an application example of well test interpretation for a horizontal well soaking test process according to the specific application process provided in the second embodiment. In this example, the time-varying line-source composite model is selected, and the fitting curve of the horizontal well in the example well during the soaking stage is as follows Figure 8 As shown, the interpretation data are obtained as shown in Table 1:

[0262] Table 1

[0263] Inner zone permeability, ×10 -3 μm 2

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Abstract

The invention provides a well test interpretation method of a horizontal well for thickened oil thermal recovery. The well test interpretation method of the horizontal well for the thickened oil thermal recovery comprises: adopting a time varying line source composite well test model according to underground fluid of a thickened oil horizontal well and thermal field distribution characteristics; constructing a line source function according to the time varying line source composite well test model; choosing a plate source function according to boundary conditions of the thickened oil horizontal well; superimposing the line source function and the plate source function, and obtaining a source function of the horizontal well for the thickened oil thermal recovery; obtaining a Laplace space solution of a no well storage bottom hole pressure function from the source function of the horizontal well for the thickened oil thermal recovery; and obtaining a real space solution of the well storage bottom hole pressure function from the Laplace space solution of the no well storage bottom hole pressure function. A heat felt area is assumed to be a cylinder which serves a horizontal segment of the horizontal well as a shaft, bottom hole pressure solution problems of a thickened oil horizontal well soak test process and a high-temperature production test process under a new assumption are boiled down to superposition of the plate source function and the line source function, and a new method is provided to the well test interpretation of the horizontal well for the thickened oil thermal recovery.

Description

technical field [0001] The invention relates to the technical field of well testing, in particular to a well testing interpretation method for a horizontal well in thermal recovery of heavy oil. Background technique [0002] As the possibility of discovering large thin oil reservoirs continues to decrease, the efficient development of heavy oil reservoirs has become one of the important development directions of my country's petroleum industry in the future. Compared with thin oil reservoirs, due to the high viscosity of underground crude oil, high water-oil mobility ratio, and poor water flooding development effect in the development of heavy oil reservoirs, thermal oil recovery and chemical oil recovery are often used or supplemented by development methods. As the temperature increases, the viscosity of heavy oil decreases significantly within a certain range, and has a good viscosity-temperature correlation. Therefore, thermal oil recovery has become one of the subjects t...

Claims

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Application Information

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IPC IPC(8): E21B43/24E21B47/06E21B49/00
Inventor 刘同敬张新红刘睿姜宝益周建第五鹏翔林晓江礼武
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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