Determination method of adaptive model for estimation of recoverable reserves of unconventional oil and gas reservoirs
A technology of self-adaptive model and determination method, applied in earthwork drilling, special data processing application, wellbore/well components, etc., can solve problems such as incomplete pressure data, prediction error of flow stage, complex theory of production decline analysis, etc.
Active Publication Date: 2022-03-08
CHINA UNIV OF PETROLEUM (EAST CHINA)
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However, due to the influence of the reservoir boundary and the volume of the stimulated area, multi-stage fractured horizontal wells will enter the boundary-controlled flow stage after a period of linear flow, and the applicability of the above decline models will be affected. The flow stage has a better fitting result, and the prediction error will be larger in the later flow stage
[0005] Some scholars suggest that the modern production decline analysis represented by the typical Fetkovich curve be used in unconventional reservoirs, because this type of curve is suitable for both unsteady flow and boundary-controlled flow, but the modern production decline analysis is relatively complicated in theory. Not only output data but also pressure data are needed, but the pressure data in actual production is not comprehensive
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[0043] The present invention will be described in detail below in combination with specific embodiments.
[0044] The inventive method such as figure 1 shown, including the following steps:
[0045] (1) Multi-stage fracturing horizontal well flow state discrimination method
[0046] The production characteristics of fractured wells in tight reservoirs are very large initial decline and long periods of unsteady flow. Since tight reservoirs are mostly produced by the completion of multi-stage fractured horizontal wells, the flow patterns of the fracture system can generally be divided into several types: fracture linear flow, fracture-formation bilinear flow, formation linear flow, formation quasi-radial flow, boundary control flow. Some flow phases may not occur due to wellbore effects or production conditions. Before obtaining formation parameters according to the characteristic equations of different flow stages, the diagnosis and division of flow stages are very importan...
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The invention discloses an adaptive model for estimating the recoverable reserves of unconventional oil and gas reservoirs. Firstly, the fluid state of multi-stage fracturing horizontal wells is discriminated, and relevant economic evaluation is carried out for unconventional oil and gas reservoirs to provide economic limit production. The denoising method of actual production data denoises and preprocesses the production data; calculates the decline index and β derivative based on the processed production data; estimates the end time of the linear flow and the output at the end of the linear flow; obtains the economic limit output through economic evaluation; Then forecast production and recoverable reserves. Based on the field production examples and the basic parameters of very high reservoirs, the present invention performs self-adaptive screening on various decline models through flow shape analysis, correctly judges the flow state that has not yet appeared through the analytical model, and establishes a set of Combination models for production prediction of unconventional oil and gas reservoirs. The beneficial effect of the invention is that the output and recoverable reserves of unconventional oil and gas reservoirs can be accurately judged and predicted.
Description
technical field [0001] The invention belongs to the technical field of unconventional energy development and relates to dynamic analysis and prediction of unconventional oil and gas reservoirs. Background technique [0002] Over the past two decades, the development of unconventional oil and gas resources worldwide has grown tremendously. The application of Multi-Fractured Horizontal Well (MFHW) technology has made tight oil and gas reservoirs and shale gas reservoirs Unconventional reservoirs are developed cost-effectively. Due to the extremely low matrix permeability of tight oil and gas reservoirs or shale gas reservoirs, these unconventional oil and gas reservoirs developed by multi-stage fractured horizontal wells often have a long linear flow stage. Due to geological uncertainty and complex flow patterns, the estimation of its recoverable reserves is a new challenge for reservoir engineers. [0003] Exponential decline and hyperbolic decline are often used in product...
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IPC IPC(8): E21B49/00G06F30/20
CPCE21B49/00G06F30/20
Inventor 范海军陈志刚
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)