共查询到20条相似文献,搜索用时 15 毫秒
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阐述不同定向钻进技术在金矿勘探中的应用,内容包括利用地层自然造斜规律的具体技术措施;使用死楔或活楔与孔底动力钻具进行定向钻进的具体做法:以及不同定向钻进方法的优缺点对比. 相似文献
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DENG Song PAN Haoyu LI Chaowei YAN Xiaopeng WANG Jiangshuai SHI Lin PEI Chunyu CAI Meng 《《地质学报》英文版》2024,98(2):518-530
In petroleum engineering, real-time lithology identification is very important for reservoir evaluation, drilling decisions and petroleum geological exploration. A lithology identification method while drilling based on machine learning and mud logging data is studied in this paper. This method can effectively utilize downhole parameters collected in real-time during drilling, to identify lithology in real-time and provide a reference for optimization of drilling parameters. Given the imbalance of lithology samples, the synthetic minority over-sampling technique (SMOTE) and Tomek link were used to balance the sample number of five lithologies. Meanwhile, this paper introduces Tent map, random opposition-based learning and dynamic perceived probability to the original crow search algorithm (CSA), and establishes an improved crow search algorithm (ICSA). In this paper, ICSA is used to optimize the hyperparameter combination of random forest (RF), extremely random trees (ET), extreme gradient boosting (XGB), and light gradient boosting machine (LGBM) models. In addition, this study combines the recognition advantages of the four models. The accuracy of lithology identification by the weighted average probability model reaches 0.877. The study of this paper realizes high-precision real-time lithology identification method, which can provide lithology reference for the drilling process. 相似文献
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文章介绍了目前世界上大陆科学深钻项目中采用的典型的取心钻进技术及其应用效果,提出了评价科学深钻取心技术的准则,即施工安全性、取心效果、施工效率和施工成本。根据这些准则对目前世界上主要的科学深钻取心技术进行了评价并得出结论:孔底马达/液动锤/金刚石钻进/提钻取心方法是最好的深孔取心钻进方法。 相似文献
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鄂尔多斯盆地华庆地区上三叠统延长组长63油层组属于特低渗储层,裂缝发育、分布情况及裂缝的有效性已成为制约油气有效勘探开发的瓶颈之一。以统计法为基础,综合应用岩石破裂法和能量法,以非均质性储层有限元应力场模拟为手段,对华庆地区长63储层天然裂缝发育程度和分布进行了定量化预测研究,同时结合定向岩心、薄片裂缝定量观测结果,主要依据裂缝方位、间距和密度等特征参数,初步建立了长63储层天然裂缝分布网络概念模型;该模型描述了储层裂缝发育基本状况,包括天然裂缝密度、裂缝展布形态和不同井区裂缝组合的差异性。同时,根据长63储层岩心裂缝充填情况与充填概率、裂缝结构面力学性质以及裂缝产状与现今水平主应力走向之间的关系,对储层裂缝系统的有效性进行了初步分析。结果表明,储层中无效裂缝居多,达85.6%,有效裂缝仅为14.4%;但经压裂改造后,NEE-NWW向范围内的天然裂缝系统往往易改造或转变为“有效”“显”裂缝系统,提高了储层渗流能力。 相似文献
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井下动力钻具微钻试验装置是为研制新型动力钻具提供试验条件的关键装备,该装备用于原理样机的试验测试,可降低试验成本并缩短研发周期,试验测试结果可为全尺寸物理样机的制造提供参考。本文依据井下动力钻具的工作特点和钻具试验装置测试原理,设计了一套井下动力钻具微钻试验装置,该试验装置区别于常规和传统的微钻实验台,其采用数控闭环控制钻井液动力循环和钻压,实现了水力驱动与钻压给进的精确控制,并验证了井下动力钻具微钻试验装置的可行性,为水力驱动的钻具样机试验研究提供了平台。 相似文献
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一个好的钻进参数实时采集与处理系统,有助于钻井技术人员对井下工况分析、技术决策、事故的预防与处理等。鉴于神开SK-DLS2000综合录井仪系统的钻进参数处理模块的功能滞后于现场钻探专家的需求,提出基于SK-DLS2000综合录井仪的钻进参数实时采集与开发思想,阐述了SK-DLS2000综合录井仪的钻进参数实时采集与开发的3个关键技术:数据接口的实现、数据文件存储管理、钻进参数曲线实时绘制及滚动浏览的实现,并利用该技术思想,成功开发出了一套"科钻一井钻进参数实时采集与处理系统"。 相似文献
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Oilfield development involves several key decisions, including the number, type (injection/production), location, drilling schedule, and operating control trajectories of the wells. Without considering the coupling between these decision variables, any optimization problem formulation is bound to find suboptimal solutions. This paper presents a unified formulation for oilfield development optimization that seeks to simultaneously optimize these decision variables. We show that the source/sink term of the governing multiphase flow equations includes all the above decision variables. This insight leads to a novel and unified formulation of the field development optimization problem that considers the source/sink term in reservoir simulation equations as optimization decision variables. Therefore, a single optimization problem is formulated to simultaneously search for optimal decision variables by determining the complete dynamic form of the source/sink terms. The optimization objective function is the project net present value (NPV), which involves discounted revenue from oil production, operating costs (e.g. water injection and recycling), and capital costs (e.g., cost of drilling wells). A major difficulty after formulating the generalized field development optimization problem is finding an efficient solution approach. Since the total number of cells in a reservoir model far exceeds the number of cells that are intersected by wells, the source/sink terms tend to be sparse. In fact, the drilling cost in the NPV objective function serves as a sparsity-promoting penalty to minimize the number of wells while maximizing the NPV. Inspired by this insight, we solve the optimization problem using an efficient gradient-based method based on recent algorithmic developments in sparse reconstruction literature. The gradients of the NPV function with respect to the source/sink terms is readily computed using well-established adjoint methods. Numerical experiments are presented to evaluate the feasibility and performance of the generalized field development formulation for simultaneous optimization of the number, location, type, controls, and drilling schedule of the wells. 相似文献
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Drilling engineering is technology-intensive and involves many subjects and large amounts of data. To improve the quality of production and management, decisions need to be made based on the latest data to direct the work on-site. Therefore, it is necessary to establish a safe, reliable, and efficient drilling management system that can meet daily production requirements. In this study, we describe a real-time monitoring system of field data. The system comprises real-time collection of borehole drilling parameters, ground drilling parameters, on-site video and borehole position data, and wireless data transmission to site and rear managers. The system is based on real-time monitoring of field data, the recognition and prediction of the conditions inside the borehole, the wireless transmission of data, and rear-base data analysis and feedback modules. The rear managers can view the real-time and historical drilling data at any time and compare and analyze drilling data by using the rear software of the management system to optimize the drilling program and feedback to the site. The application of the management system in production suggests that it can significantly improve drilling efficiency, reduce drilling costs and accidents in wells, and improve the automation of drilling operations. Moreover, at the same time, it can also predict complex conditions and drilling accidents in time and provide reliable real-time data to drilling technicians for on-site decision making. 相似文献