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介绍一种在钻井过程中用随钻测井 (LWD) 工具来测量地层压力的新技术。描述的随钻地层测试 (FTWD) 或GeoTAP工具使用一种类似于电缆地层测试器的测试技术。探测器延伸到地层中, 用一小样室来进行地层压力测试。然而, 钻井环境给压力测试带来许多新挑战。电缆测量工具要求与工程师有大量的交互, 而这种交互在钻井环境中是非常有限的。因此, 新工具有上传和下传能力, 而且测试控制高度自动化。新型GeoTAP工具要求每次压力测试时钻杆停止旋转 /滑动大约 7min。在这个时间泥浆泵可能打开或关闭。部分测试结果是在开泵下进行的。这里也提供了开泵状态下GeoTAP工具现场实例, 而且在绝对压力测量、重复性和精确度方面其结果和WFT数据吻合。现场实例展示了在三个不同深度点所做的三次重复压力测试的测量稳定性, 在每一点, 所记录的压力在 1lb/in2 之内。最后得出关于FTWD技术和其未来发展方向的结论。
A new technique for measuring formation pressure with logging-while-drilling (LWD) tools during drilling is presented. The described Stratigraphy and Drilling (FTWD) or GeoTAP tool uses a testing technique similar to a cable formation tester. The detector extends into the formation with a sample chamber for formation pressure testing. However, the drilling environment presents many new challenges to stress testing. Cable measurement tools require a great deal of interaction with engineers, and this interaction is very limited in the drilling environment. As a result, new tools have upload and download capabilities and test controls are highly automated. The new GeoTAP tool requires the drill stem to stop rotating / sliding about 7 minutes per pressure test. Mud pump may be on or off at this time. Part of the test results are carried out under the pump. The GeoTAP tool scene example with the pump on is also provided here, and the results are consistent with the WFT data in terms of absolute pressure measurement, repeatability and accuracy. The field examples show the measurement stability of the three repeated stress tests done at three different depth points, at each point, the recorded pressure is within 1 lb / in2. Finally, draw conclusions about FTWD technology and its future development.