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research on small molecule wetting agent for drilling fluids applied in Antarctic drilling engineering

Petroleum Science 2025年

作者： Huang, Ning Sun, Jin-Sheng Liu, Jing-Ping Lv, Kai-He deng, Xue-Fei Yi, Hai-Jiang Shandong Qingdao266580 China CNPC Engineering Technology R & D Company Limited Beijing102206 China

Antarctica contains numerous scientific mysteries, and the Antarctic ice sheet and its underlying bedrock contain important information about the geological structure of Antarctica and the evolutionary history of the ice sheet. In order to obtain the focus of these scientific explorations, the Antarctic drilling engineering is constantly developing. The drilling fluid performance directly determines the success or failure of drilling engineering. In order to enhance the poor performance for drilling fluids due to poor dispersion stability and easy settling of organoclay at ultra-low temperatures, the small-molecule wetting agent (HSr) for drilling fluid suitable for Antarctica was prepared by oleic acid, diethanolamine and benzoic acid as raw materials. Its chemical structure, properties and action mechanism were investigated by various experimental methods. The experimental results showed that 2% HSr could improve the colloidal rate for drilling fluid from 6.4% to 84.8%, and the increase rate of yield point was up to 167%. Meanwhile, it also made the drilling fluid excellent in shear dilution and thixotropy. In addition, 2% HSr could increase the density from 0.872 to 0.884 g/cm3 at −55 °C. And the drilling fluid with 2% HSr had a good thermal conductivity of 0.1458 W/(m·K) at −55 °C. This study gives a new direction for the research of drilling fluid treatment agents suitable for the Antarctic region, which will provide strong support for the scientific exploration of the Antarctic region. © 2025 The Authors

关键词： drilling fluids

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Numerical study on stress wave and viscosity dominated dynamic fracture in granular material 27

Numerical study on stress wave and viscosity dominated dynam...

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27th International Congress on Sound and Vibration, ICSV 2021

作者： dong, Jingnan Wang, Xiangyang Zhao, Zhigang Zhu, Feifei Liu, Yifan Qiao, Lei CNPC Engineering Technology R&D Company Limited Beijing102206 China China National Petroleum Corporation Jilin Oilfield Songyuan Gas Production Plant China Equipment Monitoring Center Zhongyuan Oil Field Branch Sinopec Sinopec Star Henan New Energy Development Co. Ltd

ISBN: (纸本)9788378807995

Wave propagation plays an important role in the propagation of dynamic fracture. Inertia force, rate-dependent behaviour, and stress waves are three primary features present in the dynamic fracture. In this studied, the viscosity behaviour and reflected stress waves in the dynamic crack of granular material are investigated using particle flow code. A series of dynamic fracture simulations are performed based on a double cantilever beam configuration. Energy transition, crack growth length, and crack velocity during the dynamic crack propagation are investigated. results show that under certain circumstances, the crack propagates in a jumping manner in dCB specimen as the reflected stress waves reinitiate and accelerate the crack several times. However, the reflected stress waves only trigger the re-initiation. Most of the driving force comes from the bond break of the contacts. The viscosity damping force significantly reduces the crack velocity. The maximum crack velocity in the viscosity-free system is as high as 0.96 times the rayleigh wave speed. Whereas under the same normalized initial input energy, the maximum crack velocity in the critically damped system is only half the maximum crack velocity in the viscosity-free system. Most of the viscosity energy is dissipated in the vicinity of the running crack. The stress wave propagation in the relatively far field only dissipates a very small amount of the total energy compared to the energy dissipated in the vicinity of the crack during propagation. The surface energy has a positive correlation with the crack velocity, which is significantly reduced by viscosity damping force. The simulation provides a better understanding of the stress wave and viscosity dominated dynamic crack propagation of granular material. © "Advances in Acoustics, Noise and Vibration - 2021" Proceedings of the 27th International Congress on Sound and Vibration, ICSV 2021. All rights reserved.

关键词： Viscosity

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A Semi-Analytical Model for Injection Pressure and Co2 Leakage Calculation Considering Irregular Boundaries and Multiple Leaky Wells

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SSrN 2022年

作者： Shen, Xudong Liu, Huiqing Mu, Lingyu Lyu, Xiaocong Zhang, Yuzhe You, Lei Department of Geoscience and Engineering Beijing102249 China CNPC Engineering Technology R&D Company Limited Beijing102206 China NO.1 Gas Production Plant SINOPEC North China Company Zhengzhou450007 China Hekou Oil Production Plant SINOPEC Shengli Oilfield Dongying257299 China

The depleted gas reservoir is the potential site for CO 2 geo-sequestration (CGS). However, the improperly sealed wells may provide pathways for the injected CO 2 migration, resulting in CO 2 leakage. Efficient CO 2 leakage assessment and injection performance evaluation are the key to ensuring the success of CGS. In this paper, a semi-analytical model is derived to calculate the leakage rate and pressure response. The proposed model considers problems of the irregular boundary and multiple leaky wells. According to the specified boundary shapes, the reservoir and overlying aquifer boundaries are discretized into serval segments, respectively. Then, with the boundary element method (BEM), the pressure response with a constant rate can be calculated. Based on the principle of potential superposition and duhamel’s principle, the time-variable leakage rate and actual injection pressure can be obtained. Combined with the field data from dongfang 1-1 gas field, the corresponding impacting factors are analyzed *** proposed model fits well with the previous model. It is obvious that the total leakage permeability determines the rate of inter-layered fluid exchange and the time approaching dynamic equilibrium. Even though the permeability of each well is low, the potential leakage risk may still exist in the depleted gas reservoir with multiple abandoned wells. The results also suggest that the depleted gas reservoir with a relatively low reservoir permeability and great volume ratio has great potential for CGS. The proposed model is accurate and reliable, and it could provide a valuable reference for the implementation of CO 2 capture and storage projects. © 2022, The Authors. All rights reserved.

关键词： Carbon dioxide

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Understanding hydraulic fracture propagation behavior in tight sandstone–coal interbedded formations: an experimentalinvestigation

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Petroleum Science 2019年第1期16卷 148-160页

作者： Peng Tan Yan Jin Liang Yuan Zhen-Yu Xiong Bing Hou Mian Chen Li-Ming Wan State Key Laboratory of Petroleum Resources and Engineering China University of Petroleum CNPC Engineering Technology R&D Company Limited SINOPEC Shanghai O shore Oil & Gas Company

Whether hydraulic fractures could connect multiple gas zones in the vertical plane is the key to fracturing treatment to jointly exploit coalbed methane and tight sandstone gas through integrative hydraulic fracturing in tight sandstone–coal interbedded formations. Laboratory true triaxial hydraulic fracturing experiments were conducted on layered specimens with di erent combination types of natural sandstone and coal to simulate the propagation behavior of hydraulic fractures. The effects of the fracture initiation position, fracturing fluid viscosity and injection rate were discussed. The results showed that di erent fracture morphologies could be found. When initiating from coal seams, three patterns of fracture initiation and propagation were obtained:(1) The main hydraulic fracture initiated and propagated along the natural fractures and then diverged due to the effects of in situ stress and formed secondary fractures.(2) The hydraulic fracture initiated and propagated in the direction of the maximum horizontal stress.(3) Multiple fractures initiated and propagated at the same time. With the same fracturing fluid viscosity and injection rate, the hydraulic fractures initiating in sandstones had greater chances than those in coal seams to penetrate interfaces and enter neighboring layers. Excessively small or large fracturing fluid viscosity and injection rate would do harm to the vertical extension height of the induced fracture and improvement of the stimulated reservoir volume. Compared with operation parameters(fracturing fluid viscosity and injection rate), the natural weak planes in coals were considered to be the key factor that a ected the fracture propagation path. The experimental results would make some contributions to the development of tight sandstone–coal interbedded reservoirs.

关键词： Hydraulic fracturing Fracture propagation Sandstone-coal interbed Layered formation

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Enrichment characteristics and exploration directions of deep shale gas of Ordovician-Silurian in the Sichuan Basin and its surrounding areas,China

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Petroleum Exploration and development 2022年第4期49卷 744-757页

作者： NIE Haikuan LI Pei dANG Wei dING Jianghui SUN Chuanxiang LIU Mi WANG Jin dU Wei ZHANG Peixian LI donghui SU Haikun State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development Beijing 102206China Sinopec Petroleum Exploration and Production Research Institute Beijing 102206China School of Earth Sciences and Engineering Xi’an Shiyou UniversityXi’an 710300 CNPC Engineering Technology R&D Company Limited Beijing 102206China Research Institute of Petroleum Exploration and Development Sinopec Jianghan Oilfield CompanyWuhan 430223China Sinopec East China Company Nanjing 210019China School of Energy Resources China University of GeosciencesBeijing 100083China

The enrichment characteristics of deep shale gas in the Ordovician Wufeng-Silurian Longmaxi formations in the Sichuan Basin and its surrounding areas are investigated through experiments under high temperature and high pressure,including petrophysical properties analyses,triaxial stress test and isothermal adsorption of methane experiment.(1)The deep shale reservoirs drop significantly in porosity and permeability compared with shallower shale reservoirs,and contain mainly free gas.(2)With higher deviatoric stress and axial strain,the deep shale reservoirs have higher difficulty fracturing.(3)Affected by structural location and morphology,fracture characteristics,geofluid activity stages and intensity,deep shale gas reservoirs have more complicated preservation conditions.(4)To achieve the commercial development of deep shale gas reservoirs,deepening geological understanding is the basis,and exploring reservoir simulation technology befitting the geological features is the key.(5)The siliceous shale and limestone-bearing siliceous shale in the Metabolograptus persculptus-Parakidograptus acuminatus zones(LM1-LM3 graptolite zones)are the high-production intervals for deep shale gas and the most favorable landing targets for horizontal *** water areas such as Jiaoshiba,Wulong,Luzhou and Changning with deep shale reservoirs over 10 m thickness are the most favorable areas for deep shale gas *** is recommended to carry out exploration and development practice in deep-water shale gas areas deposited deep with burial depth no more than 5000 m where the geological structure is simple and the shale thickness in the LM1-LM3 graptolite zone is greater than 10 *** is better to increase the lateral length of horizontal wells,and apply techniques including high intensity of perforations,large volume of proppant,far-field and near-wellbore diversions to maximize the stimulated deep reservoir volume.

关键词： deep shale gas enrichment conditions reservoir characteristics exploration direction Ordovician Wufeng Formation Silurian Longmaxi Formation Sichuan Basin

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A method to experimentally investigate injection-induced activation of fractures

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Journal of rock Mechanics and Geotechnical engineering 2020年第6期12卷 1326-1332页

作者： Changdong ding Yang Zhang Qi Teng dawei Hu Hui Zhou Jianfu Shao Chuanqing Zhang State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China CNPC Engineering Technology R&D Company Limited Beijing102206China PetroChina Tarim Oilfield Company Korla841000China University of Lille LaMcubeCNRS FRE 201659000LilleFrance

Natural fractures are generally well developed in most hydrocarbon and geothermal reservoirs,which can produce complex fracture networks due to the activation of fractures during hydraulic *** present paper is devoted to developing a method to investigate the activation characteristics of fracture under injection-shearing coupled condition at laboratory *** fluid is injected into the single-fractured granite until the fracture is activated based on the triaxial direct shear *** results show that injection process can significantly influence the shear stress distribution field,resulting in release of shear stress and relative slip between the opposite sides of the fractured *** injectioninduced activation of fracture is strongly dependent on the stress *** the normal stress increases,the injection-induced activation pressure increases,and the comparatively high normal stress can restrain the fracture *** fracture deformation mechanisms during fluid injection are also discussed preliminarily with the experimental *** sensitivity of shear stress to fluid injection increases with increase of shear stress level,while it decreases under high normal *** results can facilitate our understanding of the natural fracture activation behavior during fluid pressure stimulation.

关键词： Natural fracture Fluid injection Induced activation Triaxial direct shear test Hydraulic fracturing

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Case study: Casing deformation and fault slip induced by hydraulic fracturing in Sichuan basin

Case study: Casing deformation and fault slip induced by hyd...

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ArMA-CUPB Geothermal International Conference 2019

作者： Chen, Zhaowei Huang, rui Zhou, Xiaojin Song, Yi Qing, Chun Yang, Yang CNPC Engineering Technology R&D Company Limited Beijing China PetroChina Southwest Oil and Gas Field Company Chengdu China Sichuan Changning Natural Gas Development Co. Ltd. Chengdu China

In Changning and Weiyuan shale gas blocks, casing deformation occurred in more than 30% of wells during hydraulic fracturing, which restricted the efficient development of shale gas in China. Ning 201-H1 was a typical well which experienced casing deformation. The characteristics of casing deformation, include deformation time, deformation position and deformation shape, were analyzed, and the results indicate that the casing deformation was caused by a small fault slip. Using Microseismic monitoring data and ant tracking data，the dip and inclination angles of small faults were identified, and the mechanical activity of the fault was analyzed based on the in-situ stress and treating pressure data. The results show that under the in-situ stress conditions and treating pressure, the fault is critically stressed and was activated during fracturing, which caused casing deformation. The characteristics of cementing quality data, fracturing curve and microseismic data were analyzed. due to poor cementing quality, the fracturing fluid may break through the gap between casing and formation during fracturing, intrude the fault and finally activate the fault. Therefore, in order to avoid casing deformation, it is recommended to improve cementing quality and avoid small faults. Copyright © ArMA-CUPB Geothermal International Conference *** rights reserved.

关键词： Hydraulic fracturing

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Microscopic Insights into the Synergistic Mechanisms of Hydrate Inhibitors and Their Application: Experiments and Molecular dynamics Simulations

SSRN

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SSrN 2023年

作者： Liao, Bo Sun, Jinsheng Wang, Jintang Lv, Xindi Wang, Jianlong Guo, Jianxun Lv, Kaihe Wang, ren Zheng, Junjie Chen, Zhangxin Shandong Qingdao266580 China Department of Chemical & Petroleum Engineering University of Calgary ABT2N 1N4 Canada CNPC Engineering Technology R&D Company Limited Beijing102206 China Shandong Qingdao266580 China Department of Chemical and Biomolecular Engineering National University of Singapore 117585 Singapore Eastern Institute for Advanced Study Zhejiang Ningbo315000 China

drilling fluid systems with exceptional performance serve as a foundation for commercial hydrate extraction. However, most hydrate reservoirs are located at relatively deep water depths and have shallow burial depths. As a result, there are high demands on the density of a hydrate drilling fluid system. Thus, the traditional hydrate drilling fluid system no longer meet the drilling needs in deep water shallow reservoirs. In this paper, a copolymer SYZ-2 was synthesized based on N-Vinyl-Ε-caprolactam and N, N-dimethyl acrylamide. The effects of SYZ-2 and its NaCl system on methane hydrate were first tested by a constant rate cooling method, and the inhibition mechanisms of the system on hydrate nucleation and formation were investigated by molecular simulations. Meanwhile, the formulation and properties of a low-density hydrate drilling fluid system (1.06 g/cm3) based on SYZ-2 were also described in detail. The experimental results show that the hydrate formation temperature with the influence of SYZ-2 decreases from 10.6 °C to 2.7 °C, which can even be significantly reduced to -3.1 °C in the presence of 7% NaCl. The molecular dynamic simulation results show that SYZ-2 inhibits the nucleation of hydrates by decreasing the solubility of methane molecules, primarily by promoting the agglomeration of methane molecules. Additionally, SYZ-2 can also adsorb to the surface of hydrates and prevent the hydrate cage structure from capturing methane molecules. In contrast, NaCl inhibits hydrates formation by restricting the movement of water molecules. These results provide valuable insights into a better understanding of the gas hydrate inhibition mechanisms, the rational development of high-performance hydrate inhibitors for drilling fluids, as well as the construction of drilling fluid systems. © 2023, The Authors. All rights reserved.

关键词： drilling fluids

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Effects of glycine, l-arginine and their complexation with polyvinylpyrrolidone on tetrahydrofuran hydrate formation 4th

Effects of glycine, l-arginine and their complexation with p...

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4th International Conference on Material engineering and Manufacturing, ICMEM 2020, the 3rd International Conference on Materials design and Applications, ICMdA 2020, and the 2nd International Conference on Biomacromolecules and Biomimetic Materials, ICBBM 2020

作者： rong, Kesheng Shi, Xiaomei Gong, Jiaqin Wang, Qibing Liu, Kecheng Qu, Yuanzhi Yao, Xuyang Engineering Technology Research Institute of Xinjiang Oilfield Company Karamay834000 China CNPC Engineering Technology R & D Company limited Beijing102206 China China University of Petroleum Qingdao266580 China

ISBN: (纸本)9783035716887

Hydrophilic amino acids as a new type hydrate inhibitor is a hot topic for scholars. In this paper, the influence of glycine and L-arginine, and their complexation with polyvinylpyrrolidone (PVP) on hydrate formation were clarified by tetrahydrofuran (THF) hydrate formation simulation experiments, and the intrinsic influence mechanism was revealed by many experimental methods. The results show that glycine has a strong inhibitory effect on water molecules because of its strong disturbance to water molecules, and the inhibitory effect is the best when the addition of glycine is 1.0 wt%. due to the disturbance and binding of hydrophilic amino acids to water molecules, the effect of PVP on the semi-cage structure of water molecules as well as the adsorption and encapsulation of hydrate crystal particles, the combination of glycine and L-arginine and PVP has synergistic inhibitory effect on the formation of THF hydrate. When the total amount of hydrate inhibitor is 1.0 wt%, the synergistic inhibition ability of glycine and PVP is stronger. The results obtained in this paper provide an experimental and theoretical basis for the research and development of new hydrate inhibitors. © 2020 Trans Tech Publications Ltd, Switzerland.

关键词： Hydration

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Experimental investigation of geometric effects on rock mechanical behaviors

Experimental investigation of geometric effects on rock mech...

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ArMA-CUPB Geothermal International Conference 2019

作者： Li, Hui Lai, Bitao Cai, Xiao Lele, Cao Tian, Lu Li, Ben State Key Laboratory of Petroleum Resources and Engineering Beijing China China University of Petroleum Beijing China Aramco Services Company-Houston Research Center Houston United States CNPC Engineering Technology R&D Company Limited Beijing China

rock mechanical properties introduced terms such as strength, elastic modulus and Poisson's ratio, etc. which are important in petroleum engineering. The determination of reservoir's mechanical properties is critical to reduce drilling risk and maximize well and reservoir productivity. Estimates of rock mechanical properties are crucial to drilling programs, well placement, and well-completion design. rocks are heterogeneous and anisotropic materials. Therefore, rock mechanical properties vary not only with rock types, but also with measurement method, samples geometric dimension (sample length to diameter ratio and size), and other factors. In this study, uniaxial compressive tests were conducted on 31 different dimensions of Berea sandstone samples and 16 different dimensions of Eagle Ford shale cores to investigate the sample geometric effects on rock mechanical properties, including unconfined compressive strength, Young's Modulus and Poisson's ratio. The results show that sample geometry has significant impacts on rock mechanical properties: (1) For Berea sandstones, UCS decrease with increase of length to diameter ratio, and the UCS standardize factor is between 0.8 and 1.2, which means ±20% variation of UCS with length to diameter change. For Eagle Ford shale, UCS significantly decrease with increase of length to diameter ratio, and the UCS standardize factor is between 0.6 and 1.7, which illustrates up to 70% variation of UCS caused by length to diameter ratio change. For Berea sandstones, UCS exhibits the positive relationship with sample size, while for the tested Eagle Ford shale cores, the relationship of UCS and sample size is not clear. (2) For Berea sandstones, Young's modulus slightly increases with length to diameter ratio increase. However, the relationship of Young' modulus and length to diameter ratio of Eagle Ford shale is not clear in this research. (3) For both Berea sandstone and Eagle Ford cores, Poisson's ratio decreases with increasing len

关键词： Poisson ratio

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