A Drill Bit Adjustment Prediction Method for Geosteering
A geosteering and drill bit technology, applied in directional drilling, surveying, earthwork drilling and production, etc., can solve the problem of low logging data processing efficiency, large amount of measured data collection and processing, and affecting the accuracy and timeliness of geosteering operations, etc. problem, to achieve the effect of improving utilization efficiency
Active Publication Date: 2021-01-19
CHINA PETROLEUM & CHEM CORP +2
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Problems solved by technology
In the actual logging while drilling process, due to the huge amount of collected and processed measured data, this method that requires real-time construction of the formation model will make the processing efficiency of logging data low, thus affecting the efficiency of geosteering operations. Accuracy and Timeliness
In addition, the calculation method for the specific drill steering adjustment is rarely involved
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[0028] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so as to fully understand and implement the process of how to apply technical means to solve technical problems and achieve technical effects in the present invention. It should be noted that, as long as there is no conflict, each embodiment and each feature in each embodiment of the present invention can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.
[0029] The embodiment of the present invention aims to form a geological model inversion database that can be queried by using the analytical solution simulation algorithm, and use the logging data of adjacent wells and pilot wells to obtain formation parameters and divide formation layers through the inversion method, and establish The steering model is further applied to azimuth gamma imaging while drilling...
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The invention discloses a drill bit adjustment predicting method for geological guidance. The method comprises the following steps: geological guide models are built by using history adjoining well and / or guide hole well logging data; well hole stratum relative dip angles, stratum direction angles and boundary distance indicating polarization values are calculated by using direction gammas while drilling and electromagnetic wave resistivity log curves obtained in real time to correct the geological guide models and to build stratum initial models while drilling; based on response results of the stratum initial models while drilling, the models are corrected; according to preset geological model inversion databases, stratum real parameters are obtained through a quick database searching method; and according to the stratum real parameters, the change of layer interfaces in the well shaft directions of horizontal wells to be drilled is predicted, and adjusted safety distances of drill bits in target layers are calculated. The method can predict the stratum directions and the distances from the drill bits to the layer boundaries through conventional logging data while drilling, so that the logging data utilization efficiency is improved, and the geological guidance operation of engineers is directed.
Description
technical field [0001] The invention relates to the technical field of oil field development, in particular to a drill bit adjustment prediction method for geosteering based on azimuth gamma imaging while drilling and conventional electromagnetic wave resistivity while drilling. Background technique [0002] Wireline logging is always used to lower the instrument into the well for measurement after the logging while drilling is completed. However, in some cases, such as: (1) Highly deviated wells with well deviations exceeding 70 degrees or even horizontal wells , wireline logging is difficult to measure data; (2) It is difficult to obtain logging data if the well wall is not in good condition and collapses or is blocked; There are certain differences between these parameters and the original formation parameters. With the massive exploitation of oil, the monolithic oil and gas reservoirs gradually decreased, and the complex and difficult-to-move oil and gas reservoirs grad...
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IPC IPC(8): G06F17/18E21B7/04E21B47/00E21B49/00
CPCE21B7/04E21B47/00E21B49/00
Inventor 李永杰王卫张卫谢关宝赵文杰张中庆刘保银张元春
Owner CHINA PETROLEUM & CHEM CORP