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Study on the Sealing Performance of a Composite Plugging System Comprising Cement and Sn58Bi Alloy for Wellbore Applications

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Materials (Basel, Switzerland) 2025年第10期18卷 2301页

作者： Chunqing Zha Zhengyang Zhang Wei Wang Gonghui Liu Jun Li Wei Liu College of Mechanical and Energy Engineering Beijing University of Technology Beijing 100124 China. School of Engineering China University of Petroleum (Beijing) at Karamay Karamay 834000 China. CNPC Engineering Technology R&D Company Limited Beijing 102206 China.

To address the issue of sealing failure of cement materials commonly used as wellbore plugging agents in CO geological storage, this study proposes a composite wellbore plugging method that combines cement and Sn58Bi alloy. In this method, a composite sealing structure of "cement-Sn58Bi alloy-cement" is constructed within the wellbore. To evaluate the performance of this method, a series of pressure-bearing and gas-tightness experimental devices were designed, and experiments were conducted to assess the pressure-bearing capacity and gas sealing performance of the composite plugs. Additionally, optical microscopy was employed to observe and analyze the microstructure of the plugs. The effects of alloy proportion and temperature on the sealing performance of the composite plugs were systematically investigated. The experimental results indicate that both the pressure-bearing capacity and gas-tightness performance of the plugs are influenced by the alloy content and ambient temperature. Specifically, when the temperature increased from 30 °C to 60 °C, the pressure-bearing capacity decreased by an average of 28.3%; when further increased from 60 °C to 90 °C, it decreased by an average of 21.1%. In contrast, the gas-tightness performance exhibited an opposite trend, with the breakthrough pressure increasing by an average of 25.7% and 22.0%, respectively, over the same temperature intervals. Moreover, increasing the alloy proportion in the composite plugs enhanced both their pressure-bearing and gas-tightness performances. This study provides theoretical support for the application of composite plugs in CO geological storage.

关键词： CCUS Sn58Bi alloy composite plugging sealing performance

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Controllable Synthetic Carbon dots: A Promising Method for reducing Injection Pressure in Matrix by regulating Oil/Water/rock Interface Properties

SSRN

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SSrN 2023年

作者： Cao, Mengjiao Li, Yuan Song, Xuguang Chen, Yesheng Sun, Linghui Shi, Xin dai, Caili Yuan, Bin School of Petroleum Engineering China University of Petroleum（East China） Qingdao266580 China Sinopec Research Institute of Petroleum Engineering Fracturing & Acidizing and Natural Gas Production Research Institute Dongying257000 China Department of Chemical and Materials Engineering University of Alberta EdmontonABT6G 1H9 Canada CNPC Engineering Technology R&D Company Limited Beijing Petroleum Machinery Company China China Academy of Science Institute of Porous Flow & Fluid Mechanics Beijing100083 China Sinopec Northwest China Petroleum Bureau Urumqi830011 China

Effective development of unconventional resources is impeded by water flooding-related challenges, such as high pressure and under-injection, which hinder the replenishment of formation energy. Nanofluids have shown promise in reducing injection pressure, but traditional nanoparticles (NPs) face limitations in unconventional reservoirs due to their unsuitable size for micro-nano pores and aggregation tendencies. In this paper, novel carbon dots (Cds) with a simple, environmentally benign, and controllable synthetic approach have been developed, and their pressure-reduction performance and mechanism have been systematically explored. The particle size of the Cds could be tailored by a well-timely quenching reaction. Cds nanofluid demonstrated superior stability, dispersibility, and temperature/salinity resistance. In addition, Cds can regulate interfacial properties, including oil/rock and oil/water interfaces. It was found that Cds could be partially absorbed onto pore walls, reducing oil adhesion sites by 39%, altering wettability from oil-wet to neutral, and reducing rock surface roughness by 29.25%. Furthermore, Cds were rapidly adsorbed onto the remaining oil film in the pore space, reducing interfacial tension while solidifying the oil surfaces, increasing shear force around the oil surface by 1.7 times during subsequent water scouring, which makes the oil film break up more readily and remain smaller in size to migrate in the channeling. The modulation of the interface properties by Cds improved the stripping efficiency of the attached oil film and ameliorated the homogeneity and smoothness of flow channel, resulting in a significant reduction in injection pressure. Core displacement tests showed that a 0.1wt% Cds nanofluid could achieve a pressure reduction rate of 35%. The developed Cds nanofluid represents a promising solution for reducing injection pressure and improving oil recovery in unconventional reservoirs. © 2023, The Authors. All rights reserved.

关键词： Particle size

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research of drilling and completion technologies for heavy oil in Venezuela and offshore presalt hydrocarbons in Brazil

Research of drilling and completion technologies for heavy o...

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SPE Middle East Oil and Gas Show and Conference 2019, MEOS 2019

作者： Fang, Zhimeng Wang, Xi Fu, Jin Zhang, Shunyuan Chen, Chen Research Institute of Petroleum Exploration & Development CNPC Engineering Technology R&D Company Ltd. China CNPC Engineering Technology R&D Company Ltd China

ISBN: (纸本)9781613996393

Located in south of Eastern Venezuela Basin, Orinoco Oilfield is an onshore heavy oil field in South America. The heavy oil is known for its high content of acids, heavy metals and asphaltenes with a viscosity of 1000-10000mPa·s. According to the reserve report released by PdVSA by the end of 2016, JUNIN Block that is situated in east of Orinoco Oilfield has an OOIP of 178*108bbl. data of drilled wells and distances between offset horizontal intervals in Orinoco were both studied to improve ultimate production rates. 3-dimension borehole trajectories were designed and the most effective anti-collision measures were taken. After optimziation 8-12 horizontal wells are distributed on one pad. As the horizontal interval extends, the stable production time is prolonged and the accumulative production per well improves. However, the recovery rate stops increasing when the horizontal interval is over 1600m in JUNIN Block. Economically a large space between offset horizontal intervals results in fewer wells and lower costs, but a smaller space contributes to a higher production efficiency per well. If the space exceeds 600m, the accumulative production rate increases much more slightly. A three-dimension well trajectory consists of a vertical interval, an angle building interval, an angle holding interval, an angle building & direction changing interval, a direction turning interval as well as an absolute horizontal interval. Since Petrobras developed the first ever offshore deep reservoir (Lula) by scale in 2006, Brazil has been conducting a progressive campaign targeting hydrocarbons buried under deep water, which contributes to discovery of Lula, Carioca, Jupiter, Buzios, Libra and other giant presalt reservoirs in Santos Basin after Campos Basin, where there are 9 oil fields ranking among the top 20 offshore oil fields in terms of OOIP. By June 2017 over 160×104bbl oil and gas were produced per day in deep water of Santos Basin, taking up 57.1% of the total yield of Cam

关键词： Lime

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Integrated loss control and prevention technologies for complex deep wells based on precise MPd

Integrated loss control and prevention technologies for comp...

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SPE Oil and Gas India Conference and Exhibition 2019, OGIC 2019

作者： Wang, Gang Fan, Honghai Zhang, Wei Yang, Yang Han, Zili Wu, Hongxuan Li, Wanjun Li, Jiaying Zhou, Tuo Zhou, Haiqiu Liu, Jitong China University of Petroleum-Beijing CNPC Engineering Technology R and D Company Limited China China University of Petroleum-Beijing China CNPC Engineering Technology R and D Company Limited China CNPC Bohai Drilling Engineering Company Ltd China CNPC Chuanqing Drilling Engineering Company Ltd China

ISBN: (纸本)9781613996447

M15 well contains complex intervals, where anticlinal structures developed from faults make long mudstone barriers full of cracks, which makes it hard to predict pore pressure. Loss is one of the most serious problems during drilling and cementing, while blow out accidents happen sometimes. Previous casing programs hardly adjust to all complex intervals and conventional LCMs (loss control materials) play few roles. As a result, designated targets used to be rarely reached. It is proved that low pressure intervals shall be isolated firmly and complex intervals as well as reservoirs should be developed in independent intervals, thus casing programs have been modified. 188 lab tests were finalized, including 180°C hot rolling, anti-contamination test, lubricity test and inhibition experiments, in order to develop a kind of organic salt mud system that has premium inhibition, plugging, lubricating, heat & salt resistance properties. Precise MPd (managed pressure drilling) techniques are recommended to achieve near-balance drilling operation, solving borehole instability problems to some extent. In the second interval the organic salt mud system is applied, while logging and casing running may be accomplished in one time. Besides, strings can be tripped out smoothly and high pressure brine productive zones are drilled safely. φ339.7mm casing joints are set at the depth of 3848m in the second interval and φ244.5mm casing joints are set at the depth of 5177m in the third interval, in order that deeper complex formation may be developed in a separate casing interval in which precise MPd is applied with LCMs while drilling and compound plugging agents. Therefore, downhole pressure is precisely controlled and large cracks are plugged statically on 28 occasions. designated targets have been all reached and 20 oil & gas productive layers have been developed. downhole complexities arising from loss and blowout have been solved in M15, where φ339.7mm casing was set at the deepest

关键词： Hot rolling

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In-situ proppant: Beads, microproppant, and channelized-proppant

In-situ proppant: Beads, microproppant, and channelized-prop...

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Abu dhabi International Petroleum Exhibition and Conference 2019, AdIP 2019

作者： Huang, Jiangshui Gong, Wei Lin, Lijun Yin, Congbin Liu, Fuchen Zhou, Han Bai, Litao Song, Lulu Yang, Zhengzhou CNPC USA United States CNPC Chuanqing Drilling Engineering Company Ltd China CNPC Engineering Technology R&D Company Ltd China

ISBN: (纸本)9781613996720

Tight oil reservoirs need stimulation in order to produce the trapped oil. The most common form of stimulation used by the oil and gas industry is hydraulic fracturing. Fracturing operations tend to create fractures including primary fractures and microfractures. The objective of this study is to develop a fracturing fluid which can be converted into microproppant, beads, and channelized-proppant as desired in-situ during a fracturing operation to enhance the hydraulic conductivity of the microfractures and the primary fractures, and simplify the hydraulic fracturing operation, where the channelized-proppant is defined as the pillars surrounded by channels. resin, curing agents, surfactants, and aqueous phase were mixed together to form O/W emulsion to serve as fracturing fluid. After curing process, resin and curing agent would react and form proppant in-situ. The parameters affect the proppant formation such as the curing temperatures, pressure, mixing strength, surfactant concentration, and size control additives were all studied and thus through controlling the parameters, microproppant, beads, and channelized-proppant can form in-situ as desired. The particle size distribution, sphericity, roundness, conductivity, acid solubility, and crush strength were tested. Through controlling the experimental parameters and adding size control additives, fracturing fluid can be converted into microproppant, beads, and channelized-proppant as desired at a temperature from 30° C to 90° C. Almost 100% of the resin and the curing agents were converted into proppant with a specific density of 1.09g/ml. For the beads, both the sphericity and roundness are over 0.9, less than 2% fines were generated after being loaded to 15 kpsi, the acid solubility is 2.37%, and the conductivity of the beads of 20/40 mesh tested with proppant loading of 1 lb/ft2 at 4000 psi at room temperature was 227 md-ft. For the microproppant, both the sphericity and roundness are close to 1 with d50 about

关键词： Particle size

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PH-rESPONSIVE NANO-GEL PLUGGING MATErIAL, ANd PrEPArATION METHOd THErEFOr ANd USE THErEOF

PH-RESPONSIVE NANO-GEL PLUGGING MATERIAL, AND PREPARATION ME...

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作者： ZHANG, Jie 张洁 CHENG, rongchao 程荣超 FENG, Jie 冯杰 ZHAO, Zhiliang 赵志良 WANG, Shuangwei 王双威 LI, Long 李龙 ZHANG, Tianyi 张天怡

标准号: WO2023/279712(A1)

Provided in the present invention are a pH-responsive nano-gel plugging material, and a preparation method therefor and the use thereof. The pH-responsive nano-gel plugging material comprises the following raw materials in parts by mass: 50-70 parts of water, 2-3 parts of an emulsifier, 25-35 parts of an acrylic terpolymer, 10-15 parts of a polyalcohol compound, and 10-20 parts of a vinyl pyridine compound. The pH-responsive nano-gel plugging material can be applied to the plugging of Ordovician carbonate rock fractures and micro-karst cave strata, and can automatically identify Ordovician carbonate rock fractures and micro-karst cave leaking layers and realize effective blocking thereof.

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research on Weight-on-bit Self-adjusting dual-diameter PdC Bit design and Effect Evaluation Utilizing Stress-releasing Effect of rock at Bottomhole

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Arabian Journal for Science and engineering 2021年第7期46卷 6925-6937页

作者： Hu, Huaigang Guan, Zhichuan Wang, Bin Lu, Baoping Chen, Weiqing Xu, Yuqiang Liu, Yongwang CNPC Engineering Technology R&D Company Limited Beijing China China University of Petroleum (East China) Qingdao China Shandong Ultra-Deep Drilling Process Control Tech R&D Center Qingdao China Qingdao Refining and Chemical Co. LTD Qingdao China Sinopec Research Institute of Petroleum Engineering Beijing China King Fahd University of Petroleum and Minerals (KFUPM) Dhahran Saudi Arabia

rock-breaking efficiency is not so satisfied using the conventional PdC bit, especially in the hard, soft–hard interbedded, and strong abrasive formations in ultra-deep wells. A method is proposed to make full use of stress-releasing effect at bottomhole, thereby improving the rock-breaking efficiency, and a supporting weight-on-bit (WOB) self-adjusting dual-diameter PdC bit (WSdB) has been invented. The WSdB can dynamically adjust the depth-of-cut control characteristics, which could improve the rate of penetration (rOP) while mitigating the stick–slip vibration caused by the rapid change of depth of cut. The stress field of the rock at the bottomhole is calculated with a numerical method, and the working mechanism of the bit is analyzed. The application effect of the WSdB is evaluated through laboratory tests preliminarily. The results show that the stress concentration area on the shoulder of the reaming bit is decreased obviously and a larger stress unloading area emerges in the intersection between reaming and pilot bit. Thus, mechanical specific energy (MSE) can be greatly reduced when the reaming bit drills into this section. Indoor tests show that the maximum rOP of WSdB can be reached up to 70% higher compared to the conventional PdC bit, and higher rOP could be obtained with a relatively lower bit torque. With drilling parameters greater than the critical revolution and WOB, the reduction in MSE can be reached up to 36% during the rock-breaking process. Making further efforts into the optimization of bit structure to reduce the vibration intensity is expected to achieve more improved bit performance.

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Treatment technology of brine contamination and barite settlement for the high temperature and high density OBM for ultra-deep well drilling in western China

Treatment technology of brine contamination and barite settl...

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International Petroleum technology Conference 2019, IPTC 2019

作者： Wang, Jianhua Yan, Lili Liu, Fengbao Yang, Haijun Yin, da Xu, Xianguang CNPC Engineering Technology R and D Company limited China Petrochina Tarim Oilfield Company China

ISBN: (纸本)9781613996195

due to the existence of extremely high temperature, high pressure thick evaporite bed and brine layer, Kuqa piedmont structure has been identified as one of the most complicated drilling regions in the world which locates in Tarim Basin of China. In Keshen Block the occurrence rate of high pressure brine invasion during the drilling progress is high up to 56%, and barite in OBM mud is easy to settle under high temperature and longtime static conditions. Therefore, brine invasion and barite settlement are serious challenges for ultra-deep wells drilling in Western China. Increasing the density of mud is one method to deal with brine invasion during drilling, but lost circulation is easy to be caused. Another method is discharge the brine in batches to reduce the high pressure of brine layer, which requests the higher brine capacity of OBM. In this instance, a new emulsifier used in OBM was compounded to enhance the emulsifying efficiency through the increase the number of hydrophilic group on single emulsifier molecular structure. The experiment results indicated that the ability of OBM tolerance to brine contamination is higher than 60%. The instrument for evaluating the sedimentation rate of OBM at high temperature (200°C) and high pressure (20MPa) has been developed. The experiment results indicated that increasing rM6 value could improve the stability of settlement. Well KS1101 encountered lost circulation and high pressure brine layer in the same horizon, the safety density window of the drilling fluid is almost zero. Thus, the method of brine discharge in batches was used to reduce the brine layer pressure to ensure the drilling safety. A total of 1129.98m3 brine was discharged by 64 times of drainage and avoided the lost circulation. The rheology of OBM is stable, and the brine water capacity of the drilling fluid system is more than 45%. Throughout the drilling process, there was no downhole complex occurred. This OBM system has been wildly used in Keshen Blo

关键词： Infill drilling

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research Progress and Prospect of Well Integrity technology

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Journal of Power and Energy engineering 2020年第7期8卷 45-54页

作者： Lei Ma Kui Zhang Junfeng Xie Liang Yuan Hailong Geng Kun Ning Oil and Gas Engineering Institute Petro China Tarim Oilfield Company Korla China CNPC Engineering Technology R & D Company Limited Beijing China

Well integrity technology can effectively ensure the safety of the entire life cycle of oil and gas wells. With the exploration and development of more and more high-temperature, high-pressure, high-yield and deep wells, and the constantly increasing requirements for safety and environmental protection in various countries, well integrity technology has become a research hot spot in the oil industry. Based on the analysis of the four basic concepts of well integrity: full life cycle, well integrity management system, well barrier, and risk assessment, this article conducts a comparative analysis of the development history of well integrity technologies at home and abroad, and systematically summarizes foreign wells. The current status of integrity technology, based on the above investigation and analysis, puts forward suggestions for the next development direction of well integrity technology, which has certain guiding significance for the development of the integrity of the next step.

关键词： Well Integrity Basic Concept development Course technology Status Prospect

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Microscopic Molecular and Experimental Insights into Multi-Stage Inhibition Mechanisms of Alkylated Hydrate Inhibitor

SSRN

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SSrN 2022年

作者： Liao, Bo Wang, Jintang Li, Mei-Chun Lv, Kaihe Wang, Qi Li, Jian Huang, Xianbing Wang, ren Lv, Xindi Chen, Zhangxin Sun, Jinsheng Shandong Qingdao266580 China Department of Chemical & Petroleum Engineering University of Calgary ABT2N 1N4 Canada CNPC Engineering Technology R&D Company Limited Beijing102206 China Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and Engineering Nanjing Forestry University Nanjing210000 China Shandong Qingdao266580 China

The development of high-performance gas hydrate inhibitors for drilling fluids is of great significance for developing natural gas hydrates safely and efficiently. To improve the gas hydrate inhibition performance of a conventional gas inhibitor poly (vinyl pyrrolidone) (PVP), a random copolymer (SYZ-1) of N-vinyl pyrrolidone (NVP) and N, N-dimethyl acrylamide (dMAA) was synthesized, imparting abundant alkylated groups on the backbone of PVP. The results of experiments and molecular simulations illustrate that the mechanism of the inhibitors varies at different stages. The inhibitors retard hydrate formation by reducing the solubility of methane molecules in water during the nucleation phase. However, during the formation phase, the hydrate inhibition is achieved by adsorption. In particular, the absorption of PVP on the surface of hydrate can be effectively improved by alkylation, and the interaction energy of SYZ-1 with the hydrate nucleus was increased by 3.22 times compared to PVP. A molecular model for evaluating the interaction of inhibitors with hydrates is also successfully developed, which corresponds well to the experimental results. These results contribute to a better understanding of hydrate formation in drilling fluids and implications for developing new materials for high-performance hydrate drilling fluids. © 2022, The Authors. All rights reserved.

关键词： Alkylation

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