A prediction method for shale gas fracturing construction accidents
A prediction method and shale gas well technology, applied in the field of accident analysis, prediction and control, can solve the problems of prolonging the construction period, increasing the construction cost, limiting the amount of sand added and the effect of increasing production after fracturing, so as to improve the prediction accuracy, Effect of Residual and Mean Relative Error Reduction
Active Publication Date: 2021-08-31
CHINA PETROLEUM & CHEM CORP +2
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Problems solved by technology
The above-mentioned fracturing construction accidents limit the amount of sand added to fracturing and the effect of post-fracturing stimulation, which complicates the process, prolongs the construction period, and increases the construction cost; the establishment of accident prediction technology is very important for improving the success rate of fracturing and the cost of fracturing. Efficient production of rock gas resources is of great significance
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[0076] The present invention will be further described in connection with the accompanying drawings:
[0077] Shale gas mining process, fracturing pump pressure curve recorded, and the displacement of sand ratio parameters change with time, whereby the operator to understand the ground field device operation status, the downhole tool and the formation fracture extending the operating state where the like; according to the press such as the change of the pump in time to analyze and judge the quality of construction, according to the sand plug, pressure channeling characteristics make the right decisions and take appropriate adjustment measures. Therefore, fracturing curve is to get the most real-time operating construction situation, the most direct basis, which helps to accurately predict in advance reasonable adjustments fracturing parameters, prevention and control of fracturing accidents.
[0078] Fracturing pump pressure curve, and displacement parameters sand ratio is nonline...
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The invention provides a prediction method for shale gas fracturing construction accidents, which belongs to the field of accident analysis, prediction and control. The method includes: (1) obtaining the original data from the fracturing operation curve of the shale gas well site, establishing a GM(1,1) model based on the function transformation, and solving the residual sequence; (2) establishing the periodic extension of the residual sequence model; (3) utilize the period epitaxy model to generate a gray combination model, and carry out data restoration to the gray combination model to obtain forecast data; (4) predict shale gas fracturing construction accidents according to the forecast data; if the original If the data is the original pump pressure, the predicted data obtained is the predicted pump pressure; if the original data is the original displacement, the predicted data obtained is the predicted displacement; if the original data is the original sand ratio, the predicted data obtained is the predicted sand ratio Compare.
Description
Technical field [0001] Analysis, prediction and control of the present invention is in the field of accident, in particular, to a method for prediction of shale gas fracturing construction accidents. Background technique [0002] Staged fracturing of horizontal wells is a key technology for shale gas exploration and development. By shale formation for a long time, a large amount of liquid, a large amount of sand, high-displacement pumping fracturing continuous construction, shale formations are pressed apart and crack formation volume of the transformation of a certain size, so that the original level in Nada Xi shale permeability shale gas stored sufficient flow passage, and thus reaches the value of industrial exploitation. Throughout the large-scale shale gas hydraulic fracturing process, due to differences in equipment and the ground, borehole, downhole tools, the operator geological conditions and other uncertainties for the safety of construction, there will inevitably be s...
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IPC IPC(8): G06F30/20
CPCG16Z99/00
Inventor 王海涛胡瑾秋张来斌李奎为张旭东王倩林李洪春李双明
Owner CHINA PETROLEUM & CHEM CORP