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56th U.S. rock Mechanics/Geomechanics Symposium

作者： Wen, Bo Wang, Yuan Chen, Gang Zhang, Peiyu Guo, Kaijie Fu, Li Feng, Ming Yang, Henglin Zhong, Chengxu PetroChina Southwest Oil&Gasfield Company Chengdu China CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9780979497575

Lost circulation is a technical problem in drilling engineering, resulting in increased drilling cost and extended drilling cycle. reservoir rocks in Block A of Shale Gas have the characteristics of low porosity and low permeability, strong heterogeneity and fault fracture development. Lost circulation is mainly caused by fracture. Seismic fracture prediction to assess lost circulation risk has limitations. Therefore, it is necessary to study more effective methods of lost circulation risk assessment. In this paper, based on the analysis of lost circulation, seismic prediction on fractures and rock mechanics parameters in block A, a comprehensive evaluation method of lost circulation index is formed by using seismic prediction of the relative degree of fracture development, fracture apparent length and the combination of Young's modulus and Poisson's ratio in 3d attribute modeling, and the classification evaluation standard is established. The method is used to evaluate the lost circulation risk of completion drilling in shale gas well of Block A, and the evaluation results are consistent with the well drilling data. Lost circulation index evaluation method can effectively evaluate the risk of lost circulation in shale formation with low porosity and low permeability, strong heterogeneity and fracture development, which can promote the efficient development of shale gas. © 2022 ArMA, American rock Mechanics Association.

关键词： Forecasting

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Experimental study of the influencing factors and mechanisms of the pressure-reduction and augmented injection effect by nanoparticles in ultra-low permeability reservoirs

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Petroleum Science 2024年第3期21卷 1915-1927页

作者： Pan Wang Yu-Hang Hu Liao-Yuan Zhang Yong Meng Zhen-Fu Ma Tian-ru Wang Zi-Lin Zhang Ji-Chao Fang Xiao-Qiang Liu Qing You Yan Zhang Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering China University of Geosciences(Beijing)Beijing100083China School of Energy Resources China University of Geosciences(Beijing)Beijing100083China Petroleum Engineering Technology Research Institute Sinopec Shengli Oilfield CompanyDongying257000ShandongChina Hekou Oil Production Plant Sinopec Shengli Oilfield CompanyDongying257200ShandongChina Petroleum Exploration and Production Research Institute SINOPECBeijing102206China CNPC Engineering Technology R&D Company Limited Beijing102206China

Nanoparticles(NPs)have gained significant attention as a functional material due to their ability to effectively enhance pressure reduction in injection processes in ultra-low permeability *** are typically studied in controlled laboratory conditions,and their behavior in real-world,complex environments such as ultra-low permeability reservoirs,is not well understood due to the limited scope of their *** study investigates the efficacy and underlying mechanisms of NPs in decreasing injection pressure under various injection conditions(25—85℃,10—25 MPa).The results reveal that under optimal injection conditions,NPs effectively reduce injection pressure by a maximum of 22.77%in core *** pressure reduction rate is found to be positively correlated with oil saturation and permeability,and negatively correlated with temperature and ***,particle image velocimetry(PIV)experiments(25℃,atmospheric pressure)indicate that the pressure reduction is achieved by NPs through the reduction of wall shear resistance and wettability *** work has important implications for the design of water injection strategies in ultra-low permeability reservoirs.

关键词： Nanoparticle Pressure reduction Augmented injection Ultra-low permeability reservoir

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design of a dislocation Well Pattern and drilling of Shallow 3d Cluster Horizontal Wells for development of Ultra Heavy Oil

Design of a Dislocation Well Pattern and Drilling of Shallow...

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2021 SPE Middle East Oil and Gas Show and Conference, MEOS 2021

作者： Chen, Peng Yang, Guobin Chen, Lei Zhang, Guobin Han, Haochen Chen, Chen CNPC Engineering Technology R&D Company Limited

ISBN: (纸本)9781613997727

The Junin block in Venezuela was known as an ultra heavy oil belt reserved in extra shallow layers (950ft-1,380ft) with unconsolidated formations. A cluster wells platform drilling was required for the Field development Program (FdP). Optimisation of the well pattern and drilling of shallow 3d cluster horizontal wells for development of ultra heavy oil are presented in this paper. A well pattern of hand-shape dislocation was forwarded to enhance effective recovery of heavy oil in diamond blind area. Optimisation of the casing programs and control of the well trajectories as well as other key performance drilling were designed. A strict anti-collision barrier design and operation steps were worked out to assure the drilling safety. The loss-resistance, anti-collapse, stick-stuck proof, lubrication and reservoir protection were put into considerations for the drilling fluid design. recovery of heavy oil was enhanced by means of electrical heating system. drilling challenges such as shallow target zones, big build-up rate, long horizontal sections, great friction drag and torques, and well trajectories control were experienced and settled. Especially the puzzles of well trajectories control in unconsolidated formations, great friction drag and torques of strings in large displacement long horizontal sections for subsequent operations, and the unstable wellbore were tackled. A typical well data revealed that the horizontal displacement vs. TVd ratio was as high as up to 4.5. The setting depth of surface casing and the determination of KOP were critical to the horizontal wells with large displacement in shallow layers. Pressurized combined drilling and casing-running by means of top drive overcame the drag and torque and achieved planned Td and casing setting depth. The use of electrical wireline heating rod increased the temperatures in and close to the wellbore, and compensated the radius heat loss and avoided viscosity increase of heavy oil so that the output was main

关键词： Horizontal wells

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Sensitivity Study of Bingham Fluid Flow by the ratio of Inner and Outer diameters of Annulus 13th

Sensitivity Study of Bingham Fluid Flow by the Ratio of Inne...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Zhao, Yi-Peng Li, Jia-Xin Wang, Hai-Ge Cui, Meng Lin, Li-Ming CNPC Engineering Technology R&D Company Ltd. Beijing China China University of Petroleum Beijing China Institute of Mechanics CAS Beijing China

ISBN: (纸本)9789819702558

As for flow of drilling fluids, typically for laminar flow and friction of Bingham plastic fluid, in a concentrate annulus, direct numerical simulations (dNS) are carried out and compared with Mr (Metzner reed, Mr) approximate solutions. As the sensitivity research parameter of present paper, the ratio of inner and outer diameter of annulus is prescribed to be 0.3, 0.5, 0.7 and 0.9. As such ratio decreases, the difference between velocity profiles obtained by dNS and Mr approximate solutions keeps increasing;compared with dNS, ranges of flow cores via Mr approximate solutions are varied from narrow to wide;differences between two maximal velocities also gradually increase, even up to 4%. As for frictional coefficients computed by dNS, Mr approximate solutions and Landmark software, Mr approximate solutions are close to dNS with mean error of 1.8%;however, the results obtained by Landmark software are generally small with the mean error of 23%. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Laminar flow

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research and application of underbalanced drilling technology for deep shale gas horizontal wells in southern Sichuan 57

Research and application of underbalanced drilling technolog...

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57th US rock Mechanics/Geomechanics Symposium

作者： Fu, Li Yang, Henglin Ye, Xinqun Wang, Yuan Chen, Gang Yuan, Guangjie Zhang, Heng Wang, Zixin CNPC Engineering Technology R&D Company Limited Beijing China National Engineering Research Center of Oil & Gas Drilling and Completion Technology Beijing China Petro China Oil & Gas and New Energy Company Beijing China

ISBN: (纸本)9780979497582

deep shale gas has become an important alternative resource for shale gas development in China, and the number of horizontal wells drilled is increasing year by year. However, the rate of penetration, bottom hole temperature and leakage in horizontal section are seriously restricted by the high mud weight. Firstly, an underbalanced drilling technology strategy and mud weight reduction implementation process in shale reservoir are proposed. Secondly, based on the identification of abnormal high pressure mechanism, the pore pressure prediction model is optimized, and the fluid-solid-thermal coupling collapse pressure prediction model of fractured shale reservoir is established according to the characteristics of shale bedding. Finally, combined with the three-dimensional geological model, the safety window distribution of mud weight is clarified, and the favorable area of underbalanced drilling operation is divided. The underbalanced drilling technology has been tested in 10 horizontal wells. Compared with the conventional drilling wells, the rate of penetration, temperature control and leakage control is obviously improved. When the mud weight is reduced by 0.2 ~ 0.45g/cm3, the bottom hole circulation temperature is reduced by 3 ~ 8 °C, the average rate of penetration is increased by 17 %, and the average leakage and loss time of single well are reduced by 239m3 and 207h respectively. © 2023 57th US rock Mechanics/Geomechanics Symposium. All rights reserved.

关键词： Horizontal wells

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development of Automatic recognition and recording System for rig Jobs

Development of Automatic Recognition and Recording System fo...

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2022 IAdC/SPE International drilling Conference and Exhibition, dC 2022

作者： Ge, Yunhua Zhang, Yanlong Ge, Su Mei, Yunyi Wang, Wenzhi Yong, Fengwei He, david Zhang, Josh Wang, Zhenyu Wang, Yuxin CNPC – Engineering Technology R&D Company Limited China CNPC – Research Institute of Petroleum E&D China Sinohan Science and Technology Ltd. China CNPC United States CNPC – Western Drilling Company China

ISBN: (纸本)9781613998427

Keeping a record of drilling process automatically in real time is a requisite for KPI studies and getting support from rOCs experts. There are five categories of technical data describing a well's drilling process, which are rig jobs in time sequence, job operational parameters, unit lithology by depth, wellbore configuration by depth and job appraisal respectively. Among them, the data of rig jobs in time sequence covers whole process of well construction and is collected manually via daily drilling reports or Shift forms with little data quality control and is easy to be filled by mistakes or omissions. The other four types of data are mainly collected via mud logger, MWd/LWd tools, wire-line logging tools, etc and mostly realized automatic recording with strict data quality controls. In order to solve the shortcomings of data collecting and recording of rig jobs in time sequence, an automatic recognition and recording system for rig jobs is developed. Previously, the team had tried to identify 25 common rig jobs such as on-bottom drilling, tripping-in, tripping-out, circulating, reaming, etc by developing a judgment algorithm based on real-time operating parameters from mud logger and is proved to be inaccuracy and incompleteness due to insufficient data resolutions and limited data points especially when drill string is out of hole. This time, the team takes advantages of video data from on-site surveillance cameras and develops an automatic recognition and recording system for rig jobs by integration of AI video recognition algorithm with previous method. The AI video recognition is realized by applying U-Net, Attentioned, GAN, etc. and the AI model trained by a mass of labeled data. Finally, the system is deployed in sync with Wellsite data Platform (WdP) and tested on line with real-time data from both cameras and mud logger. The online tests showed that the system could recognize various rig jobs from spud-in to end of well with correctness rate of more tha

关键词： Cameras

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A New Magnetic ranging technology Achieves the Accuracy and Operational Flexibility Needed for Plugging Complex Old Wells of Underground Gas Storage 12th

A New Magnetic Ranging Technology Achieves the Accuracy and ...

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12th International Field Exploration and development Conference, IFEdC 2022

作者： Che, Yang Qiao, Lei Yuan, Guang-Jie Lin, Sheng-Jie du, Wei-Qiang Wang, Chen-Long Zhu, Xiao-Yu CNPC Engineering Technology R&D Company Limited Beijing China National Engineering Research Center for Oil & Gas Drilling and Completion Technology Beijing China North East Petroleum University Daqing China

ISBN: (纸本)9789819919635

Using depleted gas fields to store natural gas is one of the most common underground gas storage (UGS) all over the world. However, many abandoned wells with complex conditions such as downhole fishes or broken casings affect the sealing property of UGS. Thus, it is essential to plug these wells that minimize the risk of leakage. But traditional inclinometer technology is challenging to meet the measurement accuracy due to the cumulative error. A new method based on magnetic ranging technology has been developed and successfully applied in the UGS project to overcome the problem of plugging complex wells. The main technical idea is to drill a new well called relief well around the target well. Then, the electromagnetic wave is excited to the formation, and the magnetic signal generated by the electromagnetic wave will be gathered in the target well at the same time. due to the different conductivity, most of the signals will gather along the ferromagnetic string of the target well. Next, the array gradiometer of the magnetic ranging tool will receive the corresponding magnetic signals. Through accurate calculation, the relative position (distance and direction) between the two wells is given. According to the relative position measurement, the BHA (Bottom Hole Assembly) is used to drill forward repeatedly until the new well connects to the target well completely. Meanwhile, error model and geology-engineering integration are also considered to obtain the target spot and its TVd (true vertical depth). The magnetic ranging technology has several advantages, including lower cost and lower risk for the operator. Theoretically, various laboratory tests were conducted to demonstrate the ability to provide reliable and accurate ranging data for relatively good positioning. Practically, the paper presents field trials exclusively with three typical complex wells of UGS to validate the proposed concept. The results of laboratory tests show excellent agreement on position mea

关键词： Gas industry

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Effect of Alternating Load on Sand Production of Gas Storage 12th

Effect of Alternating Load on Sand Production of Gas Storage

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12th International Field Exploration and development Conference, IFEdC 2022

作者： Zhang, Yu-da Yuan, Guang-Jie dong, Jing-Nan Xia, Yan Ban, Fan-Sheng Zang, Chun-Yang Research Institute of Petroleum Exploration and Development Beijing China CNPC Engineering Technology R&D Company Limited Beijing China College of Petroleum Engineering Liaoning Petrochemical University Liaoning China

ISBN: (纸本)9789819919635

Energy types are constantly changing due to the change of demand, and natural gas as a clean energy is gradually accepted by the world at present. In order to ensure the stable supply of natural gas, long-term, safe and effective means of peak regulation have emerged, and gas storage has developed rapidly in recent years. The injection and production condition of gas storage changes with the demand of gas peak adjustment. The formation pressure increases and the matrix stress decreases during gas injection. The formation pressure decreases and the matrix stress increases during gas recovery. Compared with production wells, injection and production wells of gas storage are more susceptible to shear stress and tensile stress under the action of alternating loads, so the phenomenon of sand production in gas storage is very common. In this paper, based on the sand production simulation device of gas storage, the influence of alternating load on sand production of gas storage is discussed through indoor experiment. In the experiment, the magnitude and times of applying alternating load are mainly changed to observe the sand production of core. The experimental results show that the core is more likely to produce sand under the action of alternating load, and the amount of sand produced gradually increases with the increase of the number of alternating load. Unconsolidated sandstones also produce sand when the alternating load is lower than the initial sand-producing pressure. The influence of alternating load on sand production of gas storage provides theoretical and experimental basis for sand production prediction and sand control completion method optimization. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.

关键词： Sand

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A new method for predicting the density of drilling fluid based on non-parametric regression under HTHP 8

A new method for predicting the density of drilling fluid ba...

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8th International Conference on Electrical, Mechanical and Computer engineering, ICEMCE 2024

作者： Zhou, Haiqiu Ye, Yuguang Cheng, Weiheng Gu, Yixin Guo, Qijun Zhou, Tuo Bahedaer Xiao, Yue Jiang, Fuhua Zhou, Shiying Cnpc Engineering Technology R and D Company Limited Beijing China China National Oil and Gas Exploration and Development Co. Ltd. Beijing China

ISBN: (纸本)9798331506230

Temperature and pressure are important factors affecting the density of drilling fluid. As exploration and development gradually progress to deep layers and deep waters, formation temperature and pressure are getting higher and higher. Ignoring the influence of temperature and pressure on the density of drilling fluid will lead to large deviations in drilling hydraulic calculations and increase the probability of accidents such as lost circulation and overflow. In this paper, the density change of a set of field oil-based drilling fluids is measured through laboratory experiments. The temperature range is 20-180°C, and the pressure range is 0.1 MPa-180 MPa. A high-temperature and high-pressure density prediction model for oil-based drilling fluids is established based on the weighted linear regression method. Based on the established model, the high-temperature and high-pressure density of the experimental drilling fluid is predicted. The results show that the prediction error is less than 5%, and the calculation accuracy is high, which can guide on-site operation and construction. © 2024 IEEE.

关键词： drilling fluids

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Experiment on Mechanical Properties and Seepage Capability of deep Tight Sandstone under True-Triaxial Stresses Environment

Experiment on Mechanical Properties and Seepage Capability o...

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2021 Abu dhabi International Petroleum Exhibition and Conference, AdIP 2021

作者： Li, Jiaying Qi, Chunyan Gu, Ye Ye, Yu Zhao, Jie CNPC Engineering Technology R&D Company Limited CNPC Tarim Oilfield Company

ISBN: (纸本)9781613998342

The characteristics of seepage capability and rock strain during reservoir depletion are important for reservoir recovery, which would significantly influence production strategy optimization. The Cretaceous deep natural gas reservoirs in Keshen Gasfield in Tarim Basin are mainly buried over 5000 m, featuring with ultra-low permeability, developed natural fractures and complex in-situ stress states. However, there is no comprehensive study on the variation of mechanical properties and seepage capability of this gas reservoir under in-situ stress conditions and most studies on stress-sensitivity are conducted under conventional triaxial or uniaxial stress conditions, which cannot truly represent in-situ stress environment. In this work, Cretaceous tight sandstone in Keshen Gasfield was tested under true-triaxial stresses conditions by an advanced geophysical imaging true-triaxial testing system to study the stress-sensitivity and anisotropy of rock stress-strain behavior, porosity and permeability. Four groups of sandstone samples are prepared as the size of 80mm×80mm×80mm, three of which are artificially fractured with different angle (0°,15°，30°) to simulate hydraulic fracturing. The test results corresponding to different samples are compared to further reveal the influence of the fracture angle on rock mechanical properties and seepage capability. The samples are in elastic strain during reservoir depletion, showing an apparent correlation with fracture angles. The porosity decreases linearly with stress loading, where the decrease rate of effective porosity of fracture samples is significantly higher than that of intact samples. The permeabilities decrease exponentially and show significant anisotropy in different principal stress directions, especially in σH direction. The mechanical properties and seepage capability of deep tight sandstone are successfully tested under true-triaxial stresses conditions in this work, which reveals the stress-sensitivity of anis

关键词： Porosity

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