A well trajectory design method and system

A design method and well trajectory technology, applied in the field of well trajectory design method and system, can solve the problems of intermittent research, failure to study continuous changes of reservoir medium, and inability to accurately reflect the lateral distribution and changes of reservoir oil and gas, etc., to achieve The effect of increasing the resolution

Active Publication Date: 2017-11-21
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

The advantage of well logging data is that it can obtain detailed information of the reservoir, and its resolution can reach 10-20 cm. Geological Sections and Reservoirs
However, due to the multiple solutions of seismic inversion and attribute analysis, the prediction results of reservoir oil and gas distribution cannot accurately reflect the lateral distribution and change of reservoir oil and gas.

Method used

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  • A well trajectory design method and system
  • A well trajectory design method and system
  • A well trajectory design method and system

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Experimental program
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Effect test

Embodiment 1

[0059] figure 2 The flow chart of a method for designing a well trajectory provided in Embodiment 1 of the present invention is combined below figure 2 The method of this embodiment will be described in detail.

[0060] In step S201, a first synthetic seismic record is synthesized according to the actual logging curve of the reservoir; Figure 4a and Figure 4b The first synthetic seismic record curves in are the seismic records of well 1 and well 2 synthesized from the original logging data, respectively.

[0061] In the embodiment of the present invention, the synthetic seismic records are calculated according to the original logging data, which can make the seismic geological simulation result closer to the actual situation, so that the established prediction standard can be closer to the actual geological situation. Moreover, compared with seismic data, logging data has higher resolution, therefore, synthetic actual seismic records have higher resolution on the basis ...

Embodiment 2

[0077] The above steps are described in detail below according to a specific fluid replacement example.

[0078] The following example is to use GASSMAN petrophysical equations for fluid replacement to calculate different reservoir characteristic parameters, including reservoir thickness, porosity, water saturation, oil and gas content, and fracture changes, so that the corresponding density and velocity logging The curve changes to obtain the velocity and density logging curves after fluid replacement; the corresponding synthetic seismic records are calculated for the calculated velocity and density curves after fluid replacement, that is, the second synthetic seismic records above.

[0079] Then, analyze the characteristics of the synthetic seismic response, compare the changes of the synthetic seismic response characteristics before and after the fluid replacement, and analyze the change trend of the seismic response characteristics caused by the change of the rock physical ...

Embodiment 3

[0090] image 3 Shown is a schematic diagram of the modules of the well trajectory design system 300 according to the third embodiment of the present invention. The following combination image 3 The components of the system are described in detail.

[0091] Well trajectory design system 300 includes:

[0092] The actual seismic record synthesis module 301 is used for synthesizing the first synthetic seismic record according to the actual logging curve of the reservoir;

[0093] The fluid replacement module 302 is connected with the actual seismic record synthesis module 301, and is used for receiving the first synthetic seismic record; the fluid replacement module 302 is used for obtaining the logging curve after the fluid replacement based on the change of the reservoir characteristic parameters caused by the fluid replacement;

[0094] The seismic geological simulation module 303 is connected to the fluid replacement module 302, and is used for receiving the logging curve d...

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Abstract

The invention discloses a well trajectory design method and system. The method includes: synthesizing the first synthetic seismic record according to the actual logging curve of the reservoir; obtaining the logging curve after the fluid replacement based on the change of the reservoir characteristic parameter caused by the fluid replacement; and synthesizing the first synthetic seismic record according to the logging curve after the fluid replacement The second synthetic seismic record, and according to the changes in the characteristics of the first synthetic seismic record and the second synthetic seismic record, obtain the relationship between the seismic response characteristics of the reservoir and the change of the characteristic parameters of the reservoir; according to the actual seismic profile and the earthquake Seismic comparative tracking is carried out on the relationship between response characteristics and reservoir characteristic parameters to determine the distribution of oil and gas in the vertical and horizontal directions of the reservoir; the well trajectory is designed according to the distribution of oil and gas in the vertical and horizontal directions of the reservoir. The invention can use the seismic records to analyze the lateral distribution of oil and gas in the reservoir and the change law of different azimuths, accurately predict the lateral changes of the reservoir, and design well trajectories more effectively.

Description

technical field [0001] The invention relates to the field of petroleum exploration and development, in particular to a method and system for designing a well trajectory. Background technique [0002] Due to the complex geological conditions, the distribution of oil and gas in the reservoir varies in different directions, which increases the difficulty of oil and gas development. In order to design a reasonable well trajectory and make an economical and reasonable development plan, it is necessary to accurately and carefully understand the distribution state of oil and gas in the reservoir. [0003] At this stage, the well trajectory design is mainly based on the study of geological structure to understand the favorable combination of oil and gas generation, storage and capping, determine the favorable distribution space of oil and gas, and then use logging data to predict the oil and gas distribution of the reservoir. The advantage of logging data is that it can obtain deta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30
Inventor 夏一军史云清胡向阳李浩
Owner CHINA PETROLEUM & CHEM CORP
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