随钻测井实时解释综合成图技术研究

Research on the Technique of LWD Real-time Interpretation and Comprehensive Plotting

随钻测井是保证大斜度井、水平井成功钻遇油气藏的重要手段,目前已成为提高单井产量的有效方法之一,被广泛用于这些油藏的解释评价和地质导向钻井工作。在开发随钻测井地质导向软件平台过程中,绘图所涉及的数据量很大,在绘图过程中要进行大量的比例运算、坐标转换及坐标映射等。特别是绘制需要快速连续滚屏显示的随钻测井图像,经常出现内存不足、图形刷新速度过慢、图形重叠和闪烁等现象。为满足现场速度和精度要求,采用多种坐标转换算法、内存DC绘图、局部重绘等技术,实现了大数据量随钻测井图形的快速度、高质量绘制以及图形的连续滚动显示,提高了绘图效率,保证了随钻测井资料综合成图和测井数据实时解释工作的流畅运行。软件在实际应用中取得了良好效果,很大程度上提高了随钻测井解释识别地质目标的精度,达到了实时地质导向的目的。

LWD is an important method of ensuring the successful drilling of the highly deviated well and hor- izontal well into the reservoirs and improving production of single well effectively.It is widely applied to in- terpretation,evaluation and geosteering drilling of these oil reservoirs.In the process of developing LWD geosteering software plafform,a great volume of data is involved in plotting.And in the course of plotting, much scale computing,coordinate transformation and coordinate mapping should be done.Particularly when drawing LWD plot that demands rapid and continuous scrolling display,it frequently turns out to be some phenomena, such as memory insufficiency, speed decreasing of plot refresh ,plot overlap and screen flicker etc. In order to satisfy the demands of speed and accuracy in the field ,many kinds of technologies of coordinate transformation algorithm,memory DC plotting and part redrawing are applied.Huge well logging image with mass data can be drawn fleetly in high quality,and the plot can be scrolled continuously.It also improves the efficiency of drawing and ensures running smoothly of LWD data plotting and real-time interpretation works.The software has achieved good results in practical applications,and has greatly improved the LWD in- terpretation accuracy of geological targets.It achieved the need of real-time geosteering.