Quantitative evaluation method suitable for borehole wall stability of horizontal section of deep shale gas
A quantitative evaluation and shale gas technology, applied in data processing applications, instruments, electrical digital data processing, etc., can solve the problem of inability to quantitatively describe the risk probability and severity of wellbore instability, the difficulty of ECD, and the lack of consideration of formation pressure The impact of wellbore stability analysis and other issues can be achieved to improve drilling efficiency, reduce failure rate, and shorten drilling cycle
Pending Publication Date: 2021-06-25
中石化石油工程技术服务有限公司 +2
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Benefits of technology
This patented technology helps predict when there will be an underground form that collapses or breaks down during oil production operations without causing damage. It also provides detailed data on how this happens based upon various variables like environmental conditions (temperature) and stress levels. By analyzing these results over time it becomes possible to identify potential issues with the walls before they break up. Overall, this innovation allows operators to make better decisions about constructing new boreholes more efficiently while reducing their risk of failure due to unexpected events happening around them.
Problems solved by technology
This patented method discusses the problem with analyzing the behavioral changes caused by an underground explosion during oil or natural gas production from Shanxi Province' s southwestern province through Gasochemistry Research Institute Limited located near Beijings Island. These events can cause damage that affect other areas within our country due to their complexity and lack of predictive tools. Current analytic techniques only consider static stress values but cannot account for these variations overtime. Additionally, current evaluation models have limitations when applied to dynamic situations where there may be significant variation between different scenarios.
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[0075] The invention discloses a method for quantitatively evaluating well wall stability in the horizontal section of deep shale gas, establishes and improves the existing strata collapse and fracture pressure calculation model; on this basis, establishes stratum collapse and fracture pressure Deterministic quantitative characterization method; at the same time, considering the influence of uncertain factors such as high temperature and high pressure environment, irregular well diameter, and unstable displacement on the ECD calculation results, a quantitative characterization method of ECD uncertainty was established based on the uncertainty theory; On the basis of the above two aspects of research, an analytical model for quantitatively evaluating wellbore stability was established, which solved the problem of identifying wellbore instability in the horizontal section of deep shale gas, realized quantitative evaluation of wellbore stability, and can effectively reduce failures I
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The invention discloses a quantitative evaluation method suitable for the borehole wall stability of a horizontal section of deep shale gas. The quantitative evaluation method comprises the following steps: 1, quantitatively calculating formation collapse and fracture pressure; 2, quantitatively representing uncertainty of formation collapse and fracture pressure; 3, calculating the drilling ECD of the horizontal section of the shale gas, and quantitatively representing the uncertainty of the drilling ECD of the horizontal section of the shale gas; 4, based on the quantitative representation of the formation collapse and fracture pressure uncertainty in the step 2 and the quantitative representation of the shale gas horizontal section drilling ECD uncertainty in the step 3, quantitatively evaluating the shale gas horizontal section well wall stability, namely, an analysis model for quantitatively evaluating the well wall stability is established. According to the method, the difficulty in identifying the borehole wall instability of the horizontal section of the deep shale gas is solved, the quantitative evaluation of the borehole wall stability is realized, the fault occurrence rate can be effectively reduced, the drilling efficiency is improved, the drilling period is shortened, and technical support is provided for reducing the cost and increasing the speed of shale gas drilling construction.
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