Method and system for determining formation parameters of horizontal well shale gas reservoirs
A technology for shale gas reservoirs and formation parameters, which is applied in the fields of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as slow determination speed, troublesome determination process, and no solution proposed, and achieve the effect of accurate determination.
A technology for shale gas reservoirs and formation parameters, which is applied in the fields of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as slow determination speed, troublesome determination process, and no solution proposed, and achieve the effect of accurate determination.
CN106326545BActive Publication Date: 2019-09-06PETROCHINA CO LTD +1
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[0056] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the embodiments and accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.
[0057] Considering that the unsteady-state well testing method is currently mainly used to determine the formation parameters of shale gas reservoirs in horizontal wells, in the actual implementation, the process of determining the formation parameters of shale gas reservoirs through unsteady-state well testing methods is cumbersome. Identify slow issues. In fact, during the adsorption and desorption of shale gas, the theoretical curve of bottom hole pressure drop will appear a quasi-linear section, which is actually closely related to the formation parameters of the shale gas reservoir studied...
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The embodiment of the invention provides a method and system for determining formation parameters of a horizontal well shale gas reservoir. The method comprises: setting initial formation parameters; obtaining bottom-hole pressure according to the initial formation parameters through analog computation; drawing theoretical curves of the bottom-hole pressure, pressure drop and pressure derivatives; fitting the theoretical curves with corresponding actually measured curves to obtain fitting results; if the fitting results meet a pre-set precision requirement, determining the initial formation parameters to be actual formation parameters; if the fitting results do not meet the pre-set precision requirement, correcting the initial formation parameters according to the length and position of a quasi-line segment until the fitting results meet the pre-set precision requirement; determining corrected initial formation parameters to be the actual formation parameters. According to the method and the system, provided by the invention, the formation parameters are determined according to the quasi-line segment, so that the technical problem of a non-steady state well testing method that the determination speed is slow is solved, and the aim of rapidly and accurately determining the formation parameters of the horizontal well shale gas reservoir is realized.
Description
technical field [0001] The invention relates to the technical field of oil and gas reservoir development, in particular to a method and system for determining formation parameters of a horizontal well shale gas reservoir. Background technique [0002] In actual oil and gas reservoir development, shale gas reservoirs generally refer to gas reservoirs with complex geological storage conditions and difficult exploitation. In the specific oil and gas exploration process, it is of great significance to accurately describe the relevant conditions of shale gas reservoirs in actual production, and the geological parameters of shale gas reservoirs are an important data used to describe the relevant conditions of shale gas reservoirs. Among them, due to the characteristics of the horizontal well itself, the geological parameters of the horizontal well shale gas reservoir generally include: formation adsorption parameters (such as gas adsorption pressure and gas adsorption capacity, et...
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Patent Timeline
06 Sep 2019
Publication
CN106326545B
- IPC
- G06F17/50
- CPC
- G06F30/20
- Inventors
- 卢德唐; 郑德温