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High-resolution coupling of stratigraphic'sweet-spot'lithofacies and petrophysical properties:A multiscale study of Ordovician Goldwyer Formation,Western Australia

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Petroleum Science 2023年第3期20卷 1312-1326页

作者： Yu-jie Yuan reza rezaee Jian-Wei Gu Song-Tao Wu Emad A.Al-Khdheeawi Jun Wang Bin Pan School of Earth Sciences Yunnan UniversityKunmingYunnan650500China Western Australian School of Mines:Minerals Energy and Chemical EngineeringCurtin UniversityPerthWestern AustraliaAustralia School of Petroleum Engineering China University of Petroleum(East China)QingdaoShandong266580China Research Institute of Petroleum Exploration and Development CNPCBeijing100083China National Energy of Tight Oil and Gas R&D Center Bejing100083China Petroleum Technology Department University of Technology-IraqBaghdad10066Iraq School of Civil and Resource Engineering University of Science and Technology BeijingNo.30Xueyuan RoadBeijing10083China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing400044China

The identification of stratigraphic'sweet-spot'interval is significant in oil and gas formation ***,formation evaluation in macroscopic-scale merely provides low resolution and limited infor-mation,thus may lead to uncertainties in resource *** accurately identify the'sweet-spot'intervals amongst heterogeneous lithofacies,we conducted a very high-resolution and quantitative analysis from in-situ macroscopic scale to laboratory microscopic scale on the Goldwyer formation of Canning Basin,Western *** comprehensive advanced well logging and slim-compact micro imager(SCMI)technologies were synthetically applied in couple with the laboratory nanoscaled *** results unveiled an extraordinarily large lithofacies heterogeneity between different rock intervals,with distinguished features shown in Goldwyer Ⅰ,Ⅱ,and Ⅲ *** most favorable lithofacies is recognized as the laminated argillaceous thermally-matured organic matter(OM)-rich mudstone,which is widely developed in Goldwyer Ⅲ as the major attributor to'sweet-spot'*** Ⅱ is exclusively characterized by thick mudstone intervals(94.4%),interbedded with thin calcareous mudstones(5.5%),corresponding to a depositional environment of low-energy distal section of the outer ramp ***,the most favorable lithofacies in'sweet-spot'intervals develop numerous OM-/mineral nanopores for hydrocarbon ***-rich lithofacies develops abundant inter-particle pores from 2 to 17 nm that mainly contribute to pore volume for free gas storage ***-rich lithofacies with higher maturity have OM-pores with good connectivity,bearing large specific surface area that is beneficial for adsorbed gas capacity.

关键词： Shale Nanopore structure Pore characterization Lithofacies

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Experimental study of multi-timescale crack blunting in hydraulic fracture

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Petroleum Science 2021年第1期18卷 234-244页

作者： Jing-Nan dong Guang-Jie Yuan Xiang-Yang Wang Mian Chen Yan Jin Chao Zeng Musharraf Zaman State Key Laboratory of Petroleum Resources and Prospecting(Beijing) Beijing 102249China College of Petroleum Engineering China University of PetroleumBeijing 102249China CNPC Engineering Technology R&D Company Limited Bejjing 102206China Department of Civil Architectural and Environmental EngineeringMissouri University of Sciences and TechnologyRollaMOUSA Mewbourne School of Petroleum and Geological Engineering University of OklahomaNormanOK 73019USA

Hydraulic fracture is important in unconventional oil and gas *** the propagation of the hydraulic fracture,the crack tip is blunted due to the development of the process zone in the near-tip *** this study,the blunting of the hydraulic fracture in polymethyl methacrylate specimens due to multi-timescale stress concentration is *** ratio of the initiation toughness to the arrest toughness of the blunted hydraulic fracture is measured using both the dynamic and the static *** show that a hydraulic fracture can be blunted with the time span of stress concentration from 1 ms to 600 *** is also shown that the blunting of hydraulic fracture is a highly localized *** morphology of the blunted crack depends on the stress distribution in the vicinity of the crack tip.

关键词： Hydraulic fracture Crack blunting Crack tip morphology

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Micro/nano structured oleophobic agent improving the wellbore stability of shale gas wells

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Petroleum Exploration and development 2022年第6期49卷 1452-1462页

作者： GENG Yuan SUN Jinsheng CHENG rongchao QU Yuanzhi ZHANG Zhilei WANG Jianhua WANG ren YAN Zhiyuan rEN Han WANG Jianlong CNPC Engineering Technology R&D Co.Ltd. Beijing 102206China School of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580China

Through embedding modified nano-silica particles on the surface of polystyrene using the method of Pickering emulsion polymerization,a kind of nano/micro oleophobic agent named OL-1 was *** effects of OL-1 on the rock surface properties and its performance in inhibiting the oil phase imbibition into the rock were *** performance and mechanisms of OL-1 in improving the wellbore stability of shale gas wells were evaluated and ***-1 could absorb on the surface of the shale core to form a membrane with a micro-nano two-stage roughness,making the surface energy of the core decrease to 0.13 mN/m and the contact angle of the white oil on the core surface increase from 16.39°to 153.03°.Compared with the untreated capillary tube,when immersed into 3#white oil,the capillary tube treated by OL-1 had a reversal of capillary pressure from 273.76 Pa to-297.71 Pa,and the oil imbibition height inside the capillary tube decreased from 31 mm above the external liquid level to 33 mm below the external liquid *** amount of oil invading into the rock core modified by OL-1 decreased by 64.29%compared with the untreated *** shale core immersed into the oil-based drilling fluids with 1%OL-1 had a porosity reduction rate of only 4.5%.Compared with the core immersed in the drilling fluids without OL-1,the inherent force of the core treated by 1%OL-1 increased by 24.9%,demonstrating that OL-1 could effectively improve the rock mechanical stability by inhibiting oil phase imbibition.

关键词： shale wellbore stability oil-based drilling fluids oleophobic agent micro-nano composites wettability reversal

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The Multiphase Flow rate Measurement Model of Non-Full-Pipe Based on Fluid Mechanics Coupled with Iscn-Lstm Network

SSRN

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SSrN 2022年

作者： Liang, Haibo Song, Chuanhao Wang, ren School of Mechanical Engineering Southwest Petroleum University Chengdu610500 China CNPC Engineering Technology R & D Company Limited Beijing102206 China

Based on the theory of ultrasonic doppler frequency shift extraction and combined with pipeline fluid mechanics, the superficial velocity model of Non-Full-Pipe is established by using four-channel ultrasonic array. Subsequently, ISCN-LSTM network training was carried out after ultrasonic signal data fusion to obtain the liquid level identification model. By introducing the theory of Velocity-Liquid-Level, a new multiphase flow calculation model for Non-Full-Pipe is established to calculate the overall superficial flow rate of it. The measurement experiment of Non-Full-Pipe was carried out to verify the performance of the new model. The experimental results show that compared with the CFMS composed of multiphase target flowmeters with ± 0.5 % FS, the accuracy of the UFMS using the new model is reduced by 0.9645 %, the nonlinear error is reduced by 2.293 %, the ArE is reduced by 2.57 %, the Sd is reduced by 1.39578, and the rMSE is reduced by 14.39326. © 2022, The Authors. All rights reserved.

关键词： data fusion

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Experimental Investigation on Fracture Growth for Integrated Hydraulic Fracturing in Multiple Gas Bearing Formations

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SSrN 2022年

作者： Tan, Peng Jin, Yan Fu, Shihao Chen, Zhaowei CNPC Engineering Technology R&D Company Limited Beijing102206 China China University of Petroleum Beijing102249 China

Whether hydraulic fracture could connect different gas-bearing zones was the key to jointly extract the multiple natural gases of coalbed methane, shale and other tight gases by integrated hydraulic fracturing in coal measure strata (CMS). In this paper, a several groups of combination samples comprised of artificial rocks were prepared, and true triaxial hydraulic fracturing experiments were conducted to stimulate the hydraulic fracture propagation and penetration behavior. The effects of in-situ stress, injection rate, natural fracture and well type on fracture growth were studied. The main results were as follows: (1) Fracture geometries in CMS presented strong asymmetric, nonplanar extension and unilateral expansion features in the vertical plane. (2) With higher value of vertical stress difference coefficient and injection rate, fracture vertical extension was larger and the possibility of fracture connecting adjacent gas bearing layer was bigger. (3) There was huge difference in fracture extension behavior between vertical and horizontal well. In vertical well, the main fracture presented "+" shape and fully communicated natural coal cleats system. In horizontal well, fracture height growth was not enough and fracture patterns vertically presented "H" or "T" shape, since the hydraulic fracture was easy to turn direction when propagating to natural weak planes. In addition, the fracture vertical extension ability increased with vertical stress difference coefficient rising. (4) Natural fractures could induce fracture turning and branching, which improved fracture network complexity and caused fracturing fluid loss and hydraulic energy dissipation. Thus, choosing shale or coal layer with developed natural fractures as fracturing layer was unhelpful for integrated fracturing operation. Besides, fracturing operation efficiency could be enhanced by higher fracturing fluid viscosity, injection rate and gradient sanding. These results could provide theoretical guidan

关键词： Hydraulic fracturing

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Mechanistic Insights into Janus Silica Nanoparticles as Shale Inhibitors in Water-Based drilling Fluids

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SSrN 2024年

作者： Lv, Kaihe dai, Jiajun Sun, Jinsheng Jia, Han Zhang, Chao Huang, Xianbin Shang, Jundi Qingdao266580 China Ministry of Education Qingdao266580 China CNPC Engineering Technology R & D Company Limited Beijing102206 China Key Laboratory of Colloid and Interface Chemistry Shandong University Ministry of Education Jinan250100 China

Shale hydration expansion is a serious challenge in current drilling fluid technology, which poses significant hindrances to efficient oil and gas extraction. This study investigated the potential of Janus silica nanoparticles (JNP) as novel shale inhibitors. JNP with both hydrophilic and hydrophobic characteristics was synthesized via the Pickering emulsion method. Its inhibitive properties were evaluated and compared with traditional inhibitors, namely KCl, PA, and SiO2, by the bentonite inhibition test, linear swelling test, and shale cuttings hot-rolling recovery test. Notably, at just a much low concentration of 0.5 wt%, JNP reduced the linear swelling rate from 103.1% to 40.2% and achieved a shale cutting recovery rate of 60.7% at 160℃. Based on contact angle measurements, scanning electron microscopy (SEM) observations, molecular dynamics simulation, ζ-potential measurements, X-ray diffraction (Xrd) analysis, and liquid level and capillary pressure measurements, it was proposed that the superior inhibitive performance of JNP arose from its ability to compress the electrical layer, block nanopores, and alter wettability. The novel JNP exhibited considerable potential as an effective inhibitor in water-based drilling fluids for shale oil and gas drilling. © 2024, The Authors. All rights reserved.

关键词： Emulsification

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Micro-Nano Polymer Microspheres as a Plugging Agent in Oil-Based drilling Fluid

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SSrN 2023年

作者： Zhao, Zhen Sun, Jinsheng Liu, Fan Cheng, rongchao Bai, Yingrui Wang, ren Wang, Jintang Geng, Yuan Jin, Yeliang Ma, Zhihu CNPC Engineering Technology R&D Company Limited Beijing102206 China Research Institute of Petroleum Exploration &Development Beijing100083 China China Department of Petroleum Engineering China University of Petroleum Beijing China

The wellbore instability of shale formations with micro fractures was mainly ascribed to drilling fluid invasion and pressure transmission during drilling using oil-based drilling fluids (OBdF). Nano-plugging agents or micro-plugging agents at present only match a narrow size range of nanopores or microcracks. Plugging agents with good suitability to multidimensional fractures used in OBdF are lacking. This paper synthesized micro-nano polymer microsphere dispersion (PMd) with a solid content of 30% through inverse emulsion polymerization. PMs had good wettability for water in the oil environment. The filtration of the emulsion with 4% PMd dropped the filtration through 0.1~3 μm filters to within 14 mL while the emulsion with 1% CaCO3 only plugged the filter with a pore size of 3 μm. Hydrophilic PMs with a wide size distribution have excellent suitability with multi-scale pores or cracks. PMs could reduce the filtration of OBdF after aging at 120 and 150℃ without significantly influencing their rheology and electrical stability. Based on darcy’s law, the HTHP mud cake permeability calculated decreased by half with the addition of PMd at 120 and 150℃. Moreover, the addition of PMd could decline the disc HTHP filtration by 100~50% when the disc diameter was 5~120 μm respectively. Compared with CaCO3, the PMd showed superior plugging performance and self-suitability when plugging 5~120 μm discs. Micro-nano PMs could interact with organic clays through hydrogen bonds to form thinner and denser mud cakes. They could also form hydrogen bonds with the formation surface. PMs could enter, aggregate and arrange tightly at multi-scale pores or cracks owing to their wide size distribution. In addition, they formed a dense plugging layer and prevent the filtration from invading the formation. The PMd with good compatibility, suitability and plugging performance has a promising application prospect in shale oil and gas exploration. © 2023, The Authors. All rights reserved.

关键词： Emulsification

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Prediction of indoor radio propagation using deep neural network

Prediction of indoor radio propagation using deep neural net...

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2023 IEEE International Symposium on Antennas and Propagation and USNC-UrSI radio Science Meeting, AP-S/UrSI 2023

作者： Nakanishi, Takayuki Shimizu, Kenya Hitomi, Kenzaburo Nishioka, Yasuhiro Inasawa, Yoshio Mitsubishi Electric Corparation Information Technology R&d Center Kanagawa Kamakura-shi247-8501 Japan Mitsubishi Electric Engineering Company Limited Kanagawa Kamakura-shi247-0065 Japan

ISBN: (纸本)9781665442282

radio propagation prediction is important for improving the stability and reliability of wireless communication systems. However, propagation loss prediction models by multiple regression based on measured data have problems in setting appropriate parameters and function types. This paper evaluates a radio propagation model that applies machine learning for indoor environments. The proposed neural network has the input parameters of the environmental characteristics such as floor area, ceiling height, and materials, and a dropout layer that disables the network units randomly is inserted to improve generalization performance. The rMSE (root mean squared error) by the proposed model is less than 5 dB for both training and test data and the proposed model can predict the indoor propagation more accurately than conventional models. © 2023 IEEE.

关键词： deep neural networks

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development and Performance Evaluation of a New Type of Temperature resistant Surfactant for Ultra-deep Well Casing Flushing

SSRN

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SSrN 2024年

作者： Song, Hanxuan Guo, Jixiang Wyclif, Kiyingi Wang, Xiwen He, Aiguo Li, Jiao Wang, Li Chen, Xiangwei State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing China Unconventional Petroleum Research Institute China University of Petroleum Beijing102249 China CNPC Engineering Technology R&D Company Limited China

during the ultra-deep well drilling process, drilling fluid tends to remain in the casing, contaminating it and affecting the progress of completion engineering. To address this issue, a screening method was employed to select non-ionic surfactants, with fatty alcohol polyoxyethylene ether (AEO-7) being chosen among various types. To overcome the temperature resistance issue of AEO-7, Phthalic anhydride (PA) was introduced into AEO-7, and neutralization reaction with NaHCO3 was carried out to synthesize a novel surfactant (SEO). High-temperature and high-pressure precipitation testing equipment and high-temperature cleaning equipment were set up to study the temperature-resistant cleaning performance of SEO. results indicate that surfactant SEO maintains good solubility in high-temperature environments in the solution through ionic bonding. At 200°C, the cleaning efficiency of SEO solution for different types of drilling fluid residues exceeds 95%. Additionally, SEO adsorption on metal surfaces can inhibit Cl- corrosion. Combined with micro-mechanism characterization results, SEO can disperse solid particles, adsorb organic phases, reduce interfacial tension, and achieve efficient cleaning. Field experimental results show that the surface tension retention rate of well-flushing fluid after cleaning is 95.8%, with a solid particle content of 5.4g/L, meeting onsite requirements and broad application prospects. © 2024, The Authors. All rights reserved.

关键词： Surface active agents

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A distortion model test method of the casing string system considering FSI

Journal of Engineering Research (Kuwait)

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Journal of engineering research (Kuwait) 2024年

作者： Qi, Linshan Yin, Yiyong Wang, Liyan Qu, Congfeng Liu, Binhui Yang, Shuofei College of Engineering China Agricultural University Beijing 100083 China CNPC Engineering Technology R&D Co. Ltd Beijing 102206 China

To solve the problem of prototype test's high cost and difficulty of the casing string system in shale gas horizontal wells, this paper proposes a large-scale distortion model test method for the casing string system. Firstly, the elastic centralizer is simplified as elastic support, and the dynamic model of casing string system is established by finite element method. Then, the test platform of casing string system is designed and built. The modal test results show that the maximum error of the first five natural frequencies between the numerical calculation and the test results is 5.12 %, which verifies the correctness of the dynamic model of casing string system. On this basis, the distortion model's constant power similarity law (CPSL) and power function similarity law (PFSL) are obtained by the dimensional analysis method and the least square method. The CPSL and PFSL are used to predict the vibration characteristics of the prototype casing string system by distortion models with different scaling ratios. The calculation and analysis show that the prediction accuracy of the PFSL is higher than CPSL's with the same scaling ratio, and the PFSL can accurately predict natural frequency of the prototype casing string system within a large-scale distortion range and greatly reduce the test cost. © 2024 The Authors

关键词： Applicable interval Casing string Finite element model Natural frequency Similarity law

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