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高效钻探水平井和大斜度井要求能快速识别地质上的变化,并能及时调整钻井设计。LWD测量通常具备这种能力,并能进行详细的地层评价。EMLWD测量尤其适用于岩石物性方面的解释,但工具响应过于依赖有效地层倾角,这说明准确解释(或模拟)LWD测量响应能力相当重要,有效地使用这些工具需要应用前导模拟技术。该文在对地质导向技术进行简要介绍之后,主要说明了在钻井的所有阶段使用前导模拟技术的情况。并探讨了影响模拟曲线精度的一些局限性。最后介绍了该技术在大斜度井和水平井提高导向效率方面应用的两个实例。
Efficient drilling of horizontal and high-deviated wells requires rapid identification of geological changes and timely adjustment of drilling design. LWD measurements often have this capability and enable detailed formation evaluation. EMLWD measurements are especially useful for interpretation of petrophysical aspects, but tool response is overly dependent on effective dip, indicating that it is important to accurately interpret (or simulate) LWD measurement responsiveness and that effective use of these tools requires the use of leading simulation techniques. After a brief introduction to geosteering technology, the article highlights the use of leading simulation techniques at all stages of drilling. And discusses some limitations that affect the accuracy of the simulation curve. Finally, two examples of the application of this technology in improving the guiding efficiency in high deviated wells and horizontal wells are introduced.