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Theory and Key Technologies of Drilling Engineering for Unconventional Oil...
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Theory and Key Technologies of Drilling Engineering for Unconventional Oil and Gas

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "H1: Petroleum Engineering".

Deadline for manuscript submissions: closed (15 March 2023) | Viewed by 9958

Special Issue Editor

Dr. Yanbin Wang

E-Mail Website
Guest Editor
MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, China
Interests: drilling mechanics and control technology; tubular mechanics; deepwater drilling; wellbore integrity

Special Issue Information

Dear Colleagues,

Unconventional oil and gas resources are abundant worldwide and have great scope for further exploration and development. In recent years, drilling engineering technology has achieved breakthroughs in this field. However, the path to the efficient and green development of unconventional oil and gas resources still faces great challenges. Generally, these resources are found under complex geological conditions and harsh operating environments, engendering a series of technical challenges for drilling engineering. Thus, innovative research focusing on key issues in the drilling process could provide a scientific impetus for the realization of technology breakthroughs, which is of great significance to the safe and efficient development of unconventional oil and gas.

This Special Issue aims to present the most recent advances in the theory, design, modelling, and control technology for the development of unconventional oil and gas.

Topics of interest for this publication include, but are not limited to:

  • All aspects of basic theory, technology, and field application in drilling engineering, cementing, and well completion for unconventional oil and gas;
  • Complex structure wells;
  • Ultra-deep wells;
  • Deepwater oil and gas;
  • Gas hydrate;
  • Coalbed methane;
  • Shale oil (gas);
  • Sandstone oil (gas);
  • Heavy oil;
  • Tubular mechanics;
  • Rock mechanics;
  • Fluid mechanics;
  • Wellbore integrity;
  • Drilling equipment and tools;
  • Geological conditions;
  • Downhole incidents;
  • New technology.

Dr. Yanbin Wang
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • basic theory
  • modelling
  • design and control
  • numerical simulation
  • laboratory experiment
  • new applications

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Published Papers (4 papers)

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Research

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12 pages, 1451 KiB  
Article
Intelligent Identification Method for Drilling Conditions Based on Stacking Model Fusion
by Yonghai Gao, Xin Yu, Yufa Su, Zhiming Yin, Xuerui Wang and Shaoqiang Li
Energies 2023, 16(2), 883; https://doi.org/10.3390/en16020883 - 12 Jan 2023
Cited by 1 | Viewed by 1550
Abstract
Due to the complex and changing drilling conditions and the large scale of logging data, it is extremely difficult to process the data in real time and identify dangerous working conditions. Based on the multi-classification intelligent algorithm of Stacking model fusion, the 24 [...] Read more.
Due to the complex and changing drilling conditions and the large scale of logging data, it is extremely difficult to process the data in real time and identify dangerous working conditions. Based on the multi-classification intelligent algorithm of Stacking model fusion, the 24 h actual working conditions of an XX well are classified and identified. The drilling conditions are divided into standpipe connection, tripping out, tripping in, Reaming, back Reaming, circulation, drilling, and other conditions. In the Stacking fusion model, the accuracy of the integrated model and the base learner is compared, and the confusion matrix of the drilling multi-condition recognition results is output, which verifies the effectiveness of the Stacking model fusion. Based on the variation in the parameter characteristics of different working conditions, a real-time working condition recognition diagram of the classification results is drawn, and the adaptation rules of the Stacking fusion model under different working conditions are summarized. The stacking model fusion method has a good recognition effect under the standpipe connection condition, tripping in condition, and drilling condition. These three conditions’ accuracy, recall rate, and F1 value are all above 90%. The stacking model fusion method has a relatively poor recognition effect on ‘other conditions‘, and the accuracy rate, recall rate, and F1 value reach less than 80%. Full article
(This article belongs to the Special Issue Theory and Key Technologies of Drilling Engineering for Unconventional Oil and Gas)
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17 pages, 4733 KiB  
Article
Investigating Drillstring Vibration and Stability in Coring Drilling
by Yuchen Sun, Yongsheng Liu, Xing Qin, Zijun Dou, Zibo Feng and Gansheng Yang
Energies 2022, 15(14), 5234; https://doi.org/10.3390/en15145234 - 19 Jul 2022
Cited by 5 | Viewed by 2439
Abstract
Transverse vibration of drillpipe in coring drilling is undesirable. Here, the influence of the core on drillpipe vibration is considered for the first time. Attention is focused on the vibrations of the coring drillpipe as these vibrations lead to contact and collision between [...] Read more.
Transverse vibration of drillpipe in coring drilling is undesirable. Here, the influence of the core on drillpipe vibration is considered for the first time. Attention is focused on the vibrations of the coring drillpipe as these vibrations lead to contact and collision between drillpipe and core. A reduced-order model of drill string motion is established considering fluid load and core constraints. This model considers fluid action as distributed load and drillpipe as beam structure. The constraint of the core on lateral vibration of the drillpipe is simplified as a nonlinear force. The method of multiple scales is used to analyze the disturbance of the drillpipe’s primary resonance and harmonic resonance, and the influence law of different parameters on the drillpipe resonance is obtained. The results show that damping inhibits resonance vibration, and external excitation determines the resonance type. The existence of the core will aggravate the resonance vibration of the drillpipe. The analysis results are helpful in understanding the resonance of the drillpipe in coring drilling. Some measures to suppress resonance are given in this paper. This study can provide guidance for further research on drillpipe resonance in core drilling. Full article
(This article belongs to the Special Issue Theory and Key Technologies of Drilling Engineering for Unconventional Oil and Gas)
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Review

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23 pages, 8923 KiB  
Review
A Comprehensive Review of the Oil Flow Mechanism and Numerical Simulations in Shale Oil Reservoirs
by Zhiyu Li, Zhengdong Lei, Weijun Shen, Dmitriy A. Martyushev and Xinhai Hu
Energies 2023, 16(8), 3516; https://doi.org/10.3390/en16083516 - 18 Apr 2023
Cited by 26 | Viewed by 2984
Abstract
The pore structure of shale oil reservoirs is complex, and the microscale and nanoscale effect is obvious in the development of shale oil reservoirs. Understanding the oil flow mechanism in shale reservoirs is essential for optimizing the development plan and enhancing the recovery [...] Read more.
The pore structure of shale oil reservoirs is complex, and the microscale and nanoscale effect is obvious in the development of shale oil reservoirs. Understanding the oil flow mechanism in shale reservoirs is essential for optimizing the development plan and enhancing the recovery rate of shale oil reservoirs. In this review, we briefly introduce the occurrence status of shale oil and shale oil flow in the inorganic matrix and the organic matrix (including the shrinkage of kerogen, oil diffusion in kerogen, oil transport in the organic pore channels, coupling of diffusion, and fluid transport in the organic matrix). Then, the shale oil microflow simulation and a coupling model of double-porous media for microflow and macroflow in the production process of shale oil are discussed. Finally, we summarize the main conclusions and perspectives on the oil flow mechanism and numerical simulations in shale oil reservoirs. An accurate description of shale oil occurrence status and shale oil flow in the inorganic and organic matrices is crucial for the numerical simulation of shale oil reservoirs. It can provide a basis and reference for the future directions of shale oil flow and numerical simulations during the development of shale oil reservoirs. Full article
(This article belongs to the Special Issue Theory and Key Technologies of Drilling Engineering for Unconventional Oil and Gas)
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Other

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15 pages, 2382 KiB  
Systematic Review
Research Progress on Recoil Analysis and Control Technology of Deepwater Drilling Risers
by Yanbin Wang, Tian Luan, Deli Gao and Jinduo Wang
Energies 2022, 15(19), 6897; https://doi.org/10.3390/en15196897 - 21 Sep 2022
Cited by 9 | Viewed by 2256
Abstract
The deepwater drilling riser is a very important and vulnerable connection between an offshore platform and subsea wellhead. Under some certain complex marine environment and operating conditions, the offshore platform may drift beyond the safe limitations or be driven away rapidly. In order [...] Read more.
The deepwater drilling riser is a very important and vulnerable connection between an offshore platform and subsea wellhead. Under some certain complex marine environment and operating conditions, the offshore platform may drift beyond the safe limitations or be driven away rapidly. In order to protect the safety of the platform, personnel and equipment, it is necessary to implement the emergency disconnection of the drilling riser. Since the riser is stretched under a normal connection, the riser will perform a recoil response under the combined effect of elastic potential energy and drilling fluid (mud) discharge frictional resistance after the emergency disconnection. There are complex mechanical mechanisms, influencing factors and difficult safety control problems in the recoil control process. Therefore, effectively controlling the recoil response of the deepwater drilling riser after emergency release has become one of the technical difficulties faced by deepwater drilling. The drilling mud discharge frictional resistance and tensioning force are important factors affecting the recoil response. It is necessary to develop a more general dynamic recoil model for the riser that considers the actual conditions of drilling mud discharge, floating platform motion and nonlinear tensioner factors. This paper introduces the research progress on the recoil analysis and control technology of the deepwater drilling riser, including the discharge, mechanical analysis model, the top tensioner system and control method of the recoil response, which provides a reference for future research on recoil response analyses and design of deepwater drilling risers. Full article
(This article belongs to the Special Issue Theory and Key Technologies of Drilling Engineering for Unconventional Oil and Gas)
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