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55th U.S. rock Mechanics / Geomechanics Symposium 2021

作者： Hou, Y.N. Peng, Y. Liu, Y.S. Chen, Z.X. Quan, Z.H. dong, J.N. China University of Petroleum-Beijing Changping Beijing China University of Calgary Calgary Canada The Second Gas Production Plant SINOPEC Southwest Oil and Gas Company Langzhong China CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9781713839125

The pulsating hydraulic fracturing (PHF) technology generates a pulse pressure wave at a wellhead and then propagates this pulse pressure wave to the wellbore end to fracture the rock. Compared with the conventional hydraulic fracturing (CHF), PHF can induce more complex hydraulic fracture network with lower breakdown pressure. However, the difference of bottom hole pressure (BHP) acting modes between CHF and PHF is still not clear. In this study, the BHP of CHF was calculated by the conventional-BHP model, while the BHP for PHF was obtained by the transient flow model and the method of characteristic. The BHPs during the PHF for different input frequencies ranging from 0.01 Hz to 20 Hz were calculated. In addition, the difference of BHP acting modes between the CHF and PHF was analyzed and illustrated. results show that the BHP of the CHF is a constant pressure that smaller than the wellhead pressure. In contrast, the BHP of PHF is a pulse pressure with the same frequency as the input frequency when the input frequency is smaller than 10 Hz. Moreover, the amplitudes of BHPs for different input frequencies fluctuate with the input frequencies, and there are 17 pressure peaks for input frequencies ranging from 0.01 Hz to 20 Hz. According to the Vibration Theory, these 17 pressure peaks are induced by the resonance phenomenon and the corresponding frequencies are resonance frequencies. By optimizing the input frequency, a pulse BHP with an amplitude that is two times of the input amplitude at the wellhead can be obtained. These results provide guidance for the design and optimization of PHF construction parameters. © 2021 ArMA, American rock Mechanics Association.

关键词： Hydraulic fracturing

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Modes of multi-mechanistic gas diffusion in shale matrix at varied effective stresses:Observations and analysis

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Petroleum Science 2023年第5期20卷 2908-2920页

作者： Tian-Yu Chen Yan-Yu Hao derek Elsworth Hong-Ming Zhang Zhi-Ming Hu Guang-Lei Cui Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines School of Resources and Civil Engineering and Key Laboratory of Liaoning Province on Deep Engineering and Intelligent TechnologyNortheastern UniversityShenyang110819LiaoningChina National Energy Shale Gas R&D(experiment)Center Langfang065007HebeiChina Department of Energy and Mineral Engineering EMS Energy Institute and G3 CenterPennsylvania State UniversityUniversity ParkPA16802USA Research Institute of Petroleum Exploration&Development PetroChina Company LimitedBeijing100084China

Gas diffusion in the shale matrix has a dominant effect on late-stage production from shale gas ***,adequate research on the mechanisms and contributions of gas diffusion for varied pore size populations in shale matrix under recreated in situ stress is *** report gas-diffusion measurements under constant in situ stress but variable gas pressures for contrasting non-adsorbent(helium(He))and adsorbed(methane(CH_(4)))gases to investigate the impact of effective stress on the evolution of dominant mechanisms of *** intact sample replicates true pore-network topology and diffusion *** integrated diffusion model is proposed that combines the effects of slip flow,Knudsen flow,and surface diffusion to constrain the evolution of these flow regimes and their respective contributions to the observational ***,a probability density function(PdF)is employed to separate the gas content distributions of macropores and micropores from the total gas content and to investigate gas contributions in various *** results reveal that the diffusion coefficients of both He and CH_(4) in macropores and micropores increase with gas pressure but decrease with increasing effective *** diffusion coefficients of He and CH_(4) are different in macropores but remain nearly the same in *** diffusion coefficients of slip flow and surface diffusion increase with decreasing effective stress except for CH_(4) diffusion in the micropores,while the evolution of Knudsen diffusion shows the opposite *** flow plays a dominant role in He and CH_(4) diffusion within macropores(pore size 45 nm).Knudsen diffusion gradually becomes significant for He diffusion in the micropores(pore size 4 nm),conversely,for CH_(4) diffusion in the micropores,surface diffusion becomes *** to gas production from reservoirs,the contributions of the micropores will increase gradually with the duration of gas recovery,indicating the significan

关键词： diffusion coefficient In situ stress Varied pore types diffusion mechanisms Gas-content contributions

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Three-dimensional geomechanical model establishment and application based on complicated structures in yingxi area of qinghai oilfield 54

Three-dimensional geomechanical model establishment and appl...

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54th U.S. rock Mechanics/Geomechanics Symposium

作者： Qian, Wang Youyu, Wan Changkun, Cheng Shiduo, Liu Xinyuan, Feng Youmin, Liu CNPC Engineering Technology R&D Company Limited Beijing China Petrochina Qinghai Oilfield Company Dunhuang Gansu China

The Yingxi deep reservoir of Qinghai oilfield is very complicated. The reservoir has strong heterogeneity. The degree of fracture developed highly. The physical properties and in-situ stress vary widely. The geological structure is complex and there are many high-angle thrust faults. For such a complicated reservoir, the comprehensive evaluation in the stage of horizontal well design is an essential and important means to improve the production after hydraulic fracturing reconstruction. Well-seismic combination method is adopted to realize the expansion from "single well" to "reservoir". On the basis of one-dimensional geomechanical analysis, in combination with structural, geological and seismic data, the three-dimensional geomechanical parameter model was built, and detailed characterization of geomechanical parameters was described. Using advanced finite element simulator and large-scale parallel computing technology, a regional three-dimensional in-situ stress field model is established. On the basis of understanding the factors that affect the complexity of hydraulic fractures, it is realized that natural fractures, in-situ stress and brittleness are the main factors in the area. Completion quality index model is established by evaluating the characteristics of natural fractures, in-situ stress and brittleness. Combined with reservoir quality, the comprehensive evaluation index of reservoir was obtained. Fracturing stage optimization and perforation position optimization were carried out. © 2020 ArMA, American rock Mechanics Association

关键词： Fracture mechanics

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A Novel Fourble Land rig and its Application in Ultra deep Well drilling

A Novel Fourble Land Rig and its Application in Ultra Deep W...

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2021 International Petroleum technology Conference, IPTC 2021

作者： Chen, Peng Wang, Junjie ding, Mingming Yang, Xiuying Zhou, Tuo Zhong, Zhao CNPC Engineering Technology R&D Co. Ltd. China CNPC Chuanqing Drilling Engineering Co. Ltd China China National Oil and Gas Exploration and Development Co. Ltd. China

ISBN: (纸本)9781613997314

A traditional land rig uses tribble in drilling operation. A novel fourble land rig using four joints as a unit has been researched and developed in order to promote operational efficiency in ultra deep well drilling. design, overall plan and crucial techniques as well as the field application result of the fourble drilling rig are presented in this paper. The fourble land drilling rig was studied based on the conventional tribble rig which utilizes three joints as a unit or a tribble. However, the novel rig adopts four joints as a unit or a fourble. Therefore, the improvement of the drilling operational efficiency could be realized by extending the length of the stand, reducing trip time and frequency, and increasing the high speed operational time of the travelling block. The extra high derrick design, fourble handling and drum roping techniques of the 9000m fourble land rig were researched. The fourble land drilling rig with nominal drilling depth of 9, 000m was designed and manufactured. The heights of the derrick and racking platform of the fouble rig were increased. The rig is able to run in hole and pull out of hole the fourble united by four joints. The high speed tripping distance gets longer, and the setback capacity gets increased. Ultra deep well drilling in the piedmont zone of Tarim basin in Xinjiang, China showed the reliable integral performance and substantial enhancement of drilling speed. The average drilling time using the fourble rig could be 15%-30% decreased as compared to that of the traditional tribble rig. The cycle of drilling would be cut down and cost of drilling would be reduced for ultra deep wells by means of the fourble rig. Oil and gas reservoirs were deep buried in depths of 7, 000m-9, 000m in the submountain area of Tarim basin where the ultra deep wells drilling are increasingly growing. The novel fourble land rig was developed in high demand of efficient drilling of ultra deep wells. It filled the gap of China's drilling rig ser

关键词： Infill drilling

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Multiphysics Simulation of the Modified Flux Coupling Type SFCL in VSC-HVdC Network

Multiphysics Simulation of the Modified Flux Coupling Type S...

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Iranian Conference on Electrical engineering (ICEE)

作者： Mohammad Khakroei Ashkan Mirzaei rajeooni Mahdi rahimi Pirbasti Hossein Heydari MAPNA Electric & Control Engineering & Manufacturing Company (MECO) Alborz Iran Department of Engineering and R&D MAPNA Generator Engineering and Manufacturing Company (PARS) Alborz Iran Department of Electrical Engineering Iran University of Science and Technology (IUST) Tehran Iran

ISBN: (数字)9798350376340

ISBN: (纸本)9798350376357

In spite of many justifications for the implementation of VSC-HVdC systems, one of the key barriers to implementing these systems is the lack of appropriate dC circuit breakers in high capacities. A superconducting fault current limiter (SFCL) can quickly limit the short circuit current and effectively decrease the tension on the dC circuit breaker. In this paper, a modified flux-coupling type SFCL (MFC-SFCL) has been proposed to prevent surge current in VSC-HVdC power systems, which has better performance than what has previously been presented. These are achieved by multi-physical simulations of an MFC-SFCL which depend on the interaction effects the three critical superconductivity parameters have together: temperature, current, and magnetic field. As such, the incorporation model on detail involves an interplay or synergy among electrical conductivity, magnetic, and thermal properties. This modeling needs advanced numerical techniques for performing the concurrent processing of the Multiphysics simulations using the Finite Element Method (FEM). Moreover, the study of the leakage flux densities and the corresponding electromagnetic forces on the superconducting coils of the SFCL under short circuit conditions is a further object of this paper.

关键词： Couplings Temperature Short-circuit currents Circuit breakers Thermal conductivity Numerical models Finite element analysis

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Case study: Treating parameters optimization in casing deformation wells of shale gas in Sichuan basin 54

Case study: Treating parameters optimization in casing defor...

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54th U.S. rock Mechanics/Geomechanics Symposium

作者： Chen, Zhaowei Huang, rui Zeng, Bo Song, Yi Zhou, Xiaojin CNPC Engineering Technology R&D Company Limited Beijing China PetroChina Southwest Oil and Gas Field Company Chengdu China

Casing deformation is a key issue which restricts the efficient development of shale gas in Sichuan Basin. We make statistics on the treating parameters and the corresponding casing deformation of 75 fracture zones in Changning block, and analyzes the effect of fluid volume reduction and pumping rate reduction on casing deformation. Taking the casing deformation wells of H pad in this block as case, the fracture model and in-situ stress model are established based on 3d seismic and well logs, the relationship between treating parameters and fault activation is established by hydraulic fracturing simulation, with which the sensitivity of treating parameters were analyzed. The field statistics results show that the reduction of pumping rate and fluid volume both have a certain effect on mitigating casing deformation, and the effect of pumping rate is better than fluid volume. The simulation results show that the reduction of pumping rate and fluid volume both can abate the fault activation level to mitigate casing deformation. Thus it provides an explanation for the field practice in theory. The simulation results also show that, for high slip risk faults, reducing fluid volume is more effective than reducing pumping rate;for medium slip risk faults, reducing pumping rate is more effective than reducing fluid volume. Based on the field and theoretical analysis results, the treating parameters optimization method of "for high slip risk faults, priority to reduce fluid volume;for medium slip risk faults, priority to reduce pump rate" is proposed. This method can be used to mitigate the faults activation by hydraulic fracturing and may provide an effective method for mitigating casing deformation. © 2020 ArMA, American rock Mechanics Association

关键词： deformation

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Elimination Strategy of Position Error for High Power Permanent Magnet Motor drive

Elimination Strategy of Position Error for High Power Perman...

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Power engineering Conference (SAUPEC), Southern African Universities

作者： Zhi Liu Jian Li Yang Lu Tao Jiang School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China CRRC Dalian R&D Company Ltd Dalian China

Permanent magnet synchronous machine (PMSM) becomes more and more popular in railway traction systems. due to non-ideal factors of position sensor, obtained rotor position exists nonlinear error, which makes a bad influence to control performance of PMSM. In this paper, the effect of position error on current harmonics from the perspective of pulse width modulation is studied by detailed mathematical derivations. Severe dc offset and current harmonics problems caused by position error brings torque ripples and extra switching losses, which is unacceptable in railway traction systems. To solve the problem, an algorithm of reconstructing rotor position considering the characteristics of high power motor is proposed, which is consisted of low-pass filter (LPF) and phase-locked loop (PLL). The reconstruction is implemented on dSP chip, which is simple and reliable. The current harmonics problem can be well improved using the proposed scheme. Simulations have been carried out to verify the effectiveness of proposed rotor position reconstruction strategy.

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Study and Analysis of Casing/Tool Contamination and damage during Fluid Circulation of drilling Fluids in Ultra-deep Wells

SSRN

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SSrN 2023年

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

In drilling ultra-deep wells, the drilling fluid circulation usually causes erosion damage to downhole casing and drilling tools. However, the extent and process of this damage to the downhole tools is intricate and less understood. In order to systematically evaluate and clarify this damage process for different types of drilling fluid contamination, this research uses a high-temperature drilling fluid damage device to simulate the damage caused to the casing/drilling tools by various drilling fluids under a field thermal gradient. Several methods have been applied, such as micro-observation, roughness scanning, compositional detection, contact angle measurement to evaluate this damage to the metal samples. After simulated erosion damage, the metal samples were analyzed from multiple angles and in all directions. The results show that the drilling fluid residues are mainly solid-phase particles and organic components. The degree of casing/tool damage decreases with an increase in bottom hole temperature, and the casing/tool is least damaged within a temperature range of 150-180°C. Moreover, the surface of the casing/tool damaged by different types of drilling fluids shows different roughness, and the wettability of drilling fluids on the casing/tool surface increases with an increase in the degree of roughness. Oil-based muds have the strongest adhesion contamination on casing/drilling tools among the drilling fluids. In contrast, polysulfonated potassium muds and ultramicro drilling fluids have the most potent erosion damage on casing/drilling tools. By analyzing the damage mechanism, it was established that the damage was mainly dominated by the abrasive wearing from solid-phase particles in concert with corrosion ions in drilling fluids, with solids producing many abrasion marks and corrosive ions causing a large number of pits. The synergistic effect from the two mud constituents exacerbates the extent to which drilling fluids damage the casing/drilling tools.

关键词： Contamination

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Study and Analysis of Casing/Tool Contamination and damage during Fluid Circulation of drilling Fluids in Ultra-deep Wells

SSRN

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SSrN 2023年

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

关键词： Contamination

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Improving the Performance of a Polyamine Shale Inhibitor by Introducing a Hydrophobic Group in Oil and Gas development

SSRN

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SSrN 2023年

作者： Huang, Xianbin dai, Zhiwen Zhang, Chao Lv, Kaihe Meng, Xu Wang, ren Lalji, Shaine Muhammadali Khan, Muhammad Arqam Ministry of Education Qingdao266580 China Qingdao266580 China CNPC Engineering Technology R&D Co. Ltd. Beijing102206 China NED University of Engineering & Technology Karachi75270 Pakistan

Wellbore instability in complex shale formations is a major technical problem that restricts drilling safety and efficiency. In this paper, a hydrophobic cationic polyamine shale inhibitor (HCPA) was prepared by introducing a hydrophobic group into the molecular structure of an amine-based shale inhibitor having a branched structure. The shale inhibition performance of HCPA and the amine-based shale inhibitor without the hydrophobic group (CPA) was investigated. The hydration inhibition mechanism of HCPA was studied by experiments of zeta potential, particle size, contact angle, thermogravimetric analysis (TGA), X-ray diffraction (Xrd), Fourier-transform infrared spectroscopy (FTIr), et al. The evaluation results show that HCPA had a better performance than CPA in terms of inhibition of hydration swelling, hydration dispersion and mud making, which indicates that the hydrophobic group is beneficial to improve the inhibition ability of the amine-based shale inhibitor. Mechanism study show that there is no hydrogen bond between HCPA and clay. The adsorption on the clay surface is mainly driven by electrostatic interaction, which reduces the repulsion of the electric double layer and thus inhibits the osmotic hydration of clay. HCPA could greatly increase the water contact angle of the rock and the mud cake. The contact angle of the rock and mud cake could reach 133° and 69.5°, respectively, when the concentration of HCPA is 0.5%. TGA and Xrd tests proved the bentonite modified by HCPA had a lower weight loss of at 200 °C than bentonite modified by CPA, and interlayer spacing of HCPA-modified bentonite was reduced compared with that of unmodified bentonite, indicating that the ability of bentonite to adsorb water molecules is reduced after the introduction of hydrophobic groups. This can effectively inhibit the surface hydration of clays. In addition, HCPA can reduce the imbibition capacity of rocks by reducing the surface tension of water. This paper can provide theor

关键词： Bentonite

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