基于地球物理反演的随钻地质导向技术研究与应用

Meng Zhu, Yunjiang Cui, C. Ma, Jinxiu Xu, Wei Yang, Ting Li
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引用次数: 0

摘要

渤海曹妃甸油田具有构造幅值低、油柱高度低、构造和储层变化复杂、流体体系复杂、底水油藏储量大的特点,均采用水平井开发。如何准确控制井眼轨迹使水平井顺利着陆,提高钻井遇水率水平,达到理想的防水高度是实现最佳开发效果的关键。经过多年的发展,油田钻井采用了地质定向技术,取得了良好的应用效果。然而,随着油田的开发,目前面临的储层变化较为复杂,且储层油柱高度较低,受海上井网密度的限制,传统的随钻测井地质引导技术存在很大局限性,满足水平井的实施要求。针对上述问题,通过聚类分析方法将地震属性与测井曲线联系起来,创新了自然伽马和井上地震属性(最大振幅),建立了电阻率与自然伽马曲线的关系,建立了钻前地质指导模型。该方法不仅赋予了地震属性测井的意义,而且解决了传统的设计井与导向井水平面差大、流体性质差异大、对风机罩检测小等造成建模误差的缺点。同时,将地质导向技术应用于曹妃甸油田低油柱底水油藏钻井技术系列,提高了地层预测精度和水平段井眼轨迹控制能力。近三年来,曹菲甸油田共实施水平井近50口,水平段平均油层钻速达到90,据统计,采用地质导向技术前的钻速提高了10%,该技术在其他油田也具有适应性,2018年B油田共钻4口水平井。成功反演了目标层上方未钻砂体的伽马曲线和电阻率曲线,达到了精确指导水平井着陆的目的。地质导向服务可以提高地质储层开发效果,降低钻完井工程难度,缩短钻井周期,提高油气田开发经济效益。油气田的科学有效开发需要各部门、各专业的密切配合,及时运用地质导向服务可以使这种配合更加完善。地质导向服务在油藏工程、钻井完井、钻井管理等方面发挥着重要作用,实现了各个行业的无缝对接。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Research and Application of LWD Geosteering Technology Based on Geophysical Inversion
Caofeidian oilfield in Bohai Sea has the characteristics of low structural amplitude, low oil column height, complex structure and reservoir change, complex fluid system, large reserve of bottom water reservoir, and all use horizontal well development. How to accurately control the well trajectory to make the horizontal well successfully landing, improve the level of drilling encounter rate, to achieve the ideal height of water protection is the key to achieve the optimal development effect. After many years of development, the geological-oriented technology has been adopted for the drilling of the oil field, which has achieved good application results. However, with the development of the oil field, the reservoir changes facing at present are more complex, and the reservoir with lower oil column height, which is limited by the density of the offshore well net, the traditional Geological guidance technology of follow-drill logging has great limitations, and it satisfies the implementation requirements of horizontal well. Aiming at the above problems, the seismic attributes are connected with the logging curve through the cluster analysis method, and the natural gamma and over-well seismic attributes (maximum amplitude) are innovated) the relationship between the resistivity and the natural gamma curve is established, and the pre-drilling geological guidance model is established. This method not only gives the meaning of seismic attribute logging, it also solves the shortcomings of the traditional modeling error caused by the large horizontal difference between the design wells and the guide wells, the difference of fluid properties and the small detection of the fan enclosure. At the same time, the geological guidance technology in Caofeidian Oil Field low oil column bottom water reservoir with Drilling Technology series, improve the landing prediction accuracy and level segment well trajectory control ability. In the past three years, nearly 50 horizontal wells were implemented in Caofeidian Oilfield, and the average oil layer drilling rate of the horizontal segment reached 90, according to statistics, it has improved 10% on the drilling encounter rate before using the geological guidance technology, which is also adaptive in other oil fields, and 4 horizontal wells were drilled in the B oilfield in 2018, the gamma-ray and resistivity curves of non-drilled sand bodies above the target layer have been successfully retrieved, and the aim of accurately guiding the horizontal well landing has been achieved. Geosteering services could improve geological reservoir development effect, decrease difficulty in drilling and completion engineering, reduce drilling cycle, and enhance economic performance of oil & gas field development. The authors believe that scientific and effective development of oil & gas fields requires all departments and professions to cooperate closely, and the cooperation could get more perfect by timely using geosteering services. Geosteering services play an important role in reservoir engineering, drilling and completion, and drilling management, etc., connecting various professions seamlessly.
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