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A set of sandy conglomerate strata is generally developed at the bottom of the Paleogenetic Guantao Formation in the eastern part of the Bohai Bay Basin, which is controlled by tectonic sedimentation and has many characteristics, such as rapid lateral change, high gravel content, different particle sizes, strong heterogeneity, high compressive strength, strong abrasiveness, and difficult evaluation of formation drilling ability. As a result, in the drilling process of this set of formations, there are widespread phenomena such as poor bit design and selection, low mechanical drilling rate, less penetration of a single bit, large frictional drag and torque, obvious bit consumption, and low drilling time. According to the statistics of drilling engineering parameters in the sand conglomerate formation in this area, it is found that the single drilling time of this well section is very low, which seriously restricts the optimal and fast drilling in this area. In view of this technical problem, combined with the typical drilling conditions, the geological engineering characteristics of the sand conglomerate that has been drilled are analyzed, and the quantitative characterization method of the basal conglomerate thickness of Guantao Formation is established by means of geology, well logging, earthquake and well logging, so as to comprehensively predict the distribution characteristics of the special lithology. On this basis, “avoid, through and around” means are adopted to reduce the thickness of drilling gravel, and a variety of drilling speed increase technologies are applied, such as drill bit optimization and drilling parameter optimization, forming the key integration technology of drilling speed increase geological engineering for sand conglomerate formation. Through block application, it shows that this set of key technologies can greatly improve the mechanical drilling rate, shorten the drilling time, and achieve good field application effect, which provides technical support for speeding up the safe and efficient drilling in the sand conglomerate formation in this area.

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Quantitative Prediction of Sand Conglomerate and Its Application in Drilling Engineering

  • 会议论文

  • 发表日期：

    2025年

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  • Cai-shun Zhao,
  • Jin-hui Deng,
  • Huan Wan,
  • Ye Zhang,
  • Hui Li,
  • Zhi-hu Zhang,
  • Sheng-li Xu,
  • Hong-ru Li

摘要

A set of sandy conglomerate strata is generally developed at the bottom of the Paleogenetic Guantao Formation in the eastern part of the Bohai Bay Basin, which is controlled by tectonic sedimentation and has many characteristics, such as rapid lateral change, high gravel content, different particle sizes, strong heterogeneity, high compressive strength, strong abrasiveness, and difficult evaluation of formation drilling ability. As a result, in the drilling process of this set of formations, there are widespread phenomena such as poor bit design and selection, low mechanical drilling rate, less penetration of a single bit, large frictional drag and torque, obvious bit consumption, and low drilling time. According to the statistics of drilling engineering parameters in the sand conglomerate formation in this area, it is found that the single drilling time of this well section is very low, which seriously restricts the optimal and fast drilling in this area. In view of this technical problem, combined with the typical drilling conditions, the geological engineering characteristics of the sand conglomerate that has been drilled are analyzed, and the quantitative characterization method of the basal conglomerate thickness of Guantao Formation is established by means of geology, well logging, earthquake and well logging, so as to comprehensively predict the distribution characteristics of the special lithology. On this basis, “avoid, through and around” means are adopted to reduce the thickness of drilling gravel, and a variety of drilling speed increase technologies are applied, such as drill bit optimization and drilling parameter optimization, forming the key integration technology of drilling speed increase geological engineering for sand conglomerate formation. Through block application, it shows that this set of key technologies can greatly improve the mechanical drilling rate, shorten the drilling time, and achieve good field application effect, which provides technical support for speeding up the safe and efficient drilling in the sand conglomerate formation in this area.