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A Well Testing Interpretation Method for Vertical Wells in Heavy Oil Thermal Recovery

A technology for well test interpretation and heavy oil thermal recovery, which is applied in wellbore/well components, production fluids, earthmoving and other directions, and can solve the problem of difficult inversion of underground reservoir fluid parameters and seepage parameters, temperature and pressure test data. Quantitative interpretation, lack of targeted mathematical models and solving methods, etc., achieve the effect of simple calculation structure and solving difficulties in accurate solutions

Inactive Publication Date: 2015-09-23
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The main purpose of the embodiment of the present invention is to provide a vertical well test interpretation method for heavy oil thermal recovery to solve the problem that the temperature and pressure test data cannot be quantitatively interpreted and difficult to reverse in the existing well test interpretation method under the condition of injecting multiple thermal fluids. Deduce fluid parameters and seepage parameters of underground reservoirs, lack of targeted mathematical models and solution methods

Method used

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  • A Well Testing Interpretation Method for Vertical Wells in Heavy Oil Thermal Recovery
  • A Well Testing Interpretation Method for Vertical Wells in Heavy Oil Thermal Recovery
  • A Well Testing Interpretation Method for Vertical Wells in Heavy Oil Thermal Recovery

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Embodiment 1

[0019] This embodiment provides a well test interpretation method for vertical wells in heavy oil thermal recovery, such as figure 1 As shown, the method includes:

[0020] Step S11, selecting a time-varying well test model according to the thermal recovery mode of the heavy oil vertical well before the well test process;

[0021] Step S12, according to the time-varying well test model, obtain the real space solution of the pseudo pressure function at the bottom of the well storage;

[0022] Step S13, converting the real space solution of the bottomhole pseudo pressure function of the well storage into a real space bottomhole pressure solution by converting the bottomhole pseudo pressure function of the well storage from the temporal domain to the time domain; wherein, The temporal domain is a multi-dimensional space whose independent variable is time, pressure and temperature, and the time domain is a one-dimensional space whose independent variable is time.

[0023] Prefer...

Embodiment 2

[0208] This embodiment provides a specific application process of well test interpretation for heavy oil vertical wells according to the well test interpretation method for heavy oil thermal recovery vertical wells in Embodiment 1, such as Figure 4 shown, including:

[0209] Step S41, input basic data;

[0210] Step S42, according to the heavy oil thermal recovery vertical well test interpretation method in Embodiment 1, by adjusting key parameters, calculate the theoretical pressure and theoretical pressure derivative curve;

[0211] Step S43, using the theoretical pressure and the theoretical pressure derivative curve to fit the measured pressure and the pressure derivative curve;

[0212] Step S44, obtaining reservoir parameters according to the fitting results.

[0213] Among them, the basic data include geological layering of test wells, logging interpretation data, multivariate thermal fluid parameters, fluid physical properties, testing process, original formation pr...

Embodiment 3

[0223] This embodiment is an application example of well test interpretation for a straight well soaking test process according to the specific application process provided in the second embodiment. In this example, the time-varying composite reservoir pressure drop well test model is selected, and the fitting curve of the example well in the brine stage of the vertical well is as follows Figure 5 As shown, the interpretation data are obtained as shown in Table 1:

[0224] Table 1

[0225] Inner zone permeability, ×10 -3 μm 2

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Abstract

The invention provides a well test interpretation method of a vertical well for thickened oil thermal recovery. The method comprises: choosing a time varying well test model according to a thickened oil vertical well thermal recovery mode before a well test process; obtaining a real space solution of a bottom pseudopressure function with well storage according to the time varying well test model; and converting the real space solution of the bottom pseudopressure function with the well storage into a real space bottom hole pressure solution through converting the bottom pseudopressure function with the well storage from a temporal domain into a time domain. The temporal domain is a multi-dimensional space, and arguments of the temporal domain are time, pressure and temperature. The time domain is a one-dimensional space, and an argument of the time domain is time. The well test interpretation method is simple in computation structure, the problem that a thermal recovery well test mathematical model is different to solve accurately is solved, and accurate inversion of oil deposit dynamic parameters through the thermal recovery well test is achieved.

Description

technical field [0001] The invention relates to the technical field of well testing, in particular to a well testing interpretation method for vertical wells in thermal recovery of heavy oil. Background technique [0002] Heavy oil generally refers to crude oil with degassed crude oil viscosity greater than 50mPa.s and relative density greater than 0.92 at the reservoir temperature. At present, the world has proven heavy oil resources of more than 300 billion tons, which is an important component of the world's oil and gas resources. The exploitation of heavy oil reservoirs is mainly based on steam huff and puff and steam flooding thermal recovery. During the thermal recovery process, the effective permeability, fluid density, viscosity, phase state and other parameters change in a complex way. It is necessary to understand and track changes in underground parameter fields in a timely manner, and implement Appropriate control measures are of great significance to improve th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/24E21B47/06E21B49/00
Inventor 刘同敬第五鹏翔康万利李俊键姜宝益周建林晓江礼武
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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