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Novel responsive Controllable Solidification Plugging Agent to Overcome Lost Circulation Problems in Long Open Hole Intervals

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Journal of Physics: Conference Series 2020年第1期1637卷

作者： Long Li da Yin Weiwei Hao CNPC Engineering Technology R&D Company Limited Beijing 102206 China PetroChina Tarim Oilfield Company Korla 841000 China

A new type of responsive controllable solidification plugging agent (rCSP) for long open hole intervals was developed, and the sealing characteristics were evaluated. rCSP had the characteristics of rapid water loss, high filter-cake consistency and good residence capacity. The experimental results indicated that the maximum pressure-bearing capacities of plugged zones in 5 mm and 10 mm slotted templets are 16.6 MPa and 11 MPa, respectively. So rCSP is an effective plugging agent for strengthening wellbore stability. rCSP is appropriate for sealing wide range of fracture sizes. Using rCSP-based plugging mud to address lost circulation problems in troublesome thief zones is a very powerful and economical approach. In the future, rCSP might hold great promise to resolve lost circulation problems in multiple leakage zones in long open hole sections.

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Study on radio frequency heating pattern of heavy oil reservoir based on multi-antenna configuration

Study on radio frequency heating pattern of heavy oil reserv...

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SPE International Heavy Oil Conference and Exhibition 2018, HOCE 2018

作者： Wang, Zhengxu Gao, deli Liu, Kui Tan, Teichuan Wang, Zhiyue Li, Wenlong China University of Petroleum Beijing China CNPC Engineering Technology R and D Company Limited China

ISBN: (纸本)9781613996409

Compared with other electrical heating processes, rF heating has the advantages of volumetric heating, therefore it has great development potential in extracting heavy oil resources. Because the EM waves used to heat reservoir are mainly derived from rF antennas, it is necessary to determine the multi-antennas layout in the horizontal wellbore to maximize the thermal energy dissipation in a single reservoir layer with uneven thickness, and minimize the extra heat loss in non-reservoir. In this work, the combination of three antenna arrays is considered during rF heating process, and the effects of their distance and operating parameters (voltage, and frequency) on heating patterns are analyzed. In addition, in order to achieve the purpose of heating reservoir at the expense of the least amount of electrical energy, the heating efficiencies of the antenna arrays with equal and different spacing are compared. At last the mathematical model used to describe rF heating process is solved by COMSOL to obtain the reservoir temperature profiles. Simulation results indicates that the frequency and voltage applied to each dipole antenna have a contribution to the heating pattern, including heating range and direction. With the increasing antenna array spacing, the heating range expands, but the maximum reservoir temperature declines. In addition, the temperature distributions in the perpendicular bisectors of any two adjacent antennas trend to gradually diminish with the increasing spacing. Gradually increasing antenna spacing will also weaken the temperature accumulation effect at the center of the reservoir. When the single reservoir layer with different thicknesses is heated, the maximum heating efficiency is 0.73 in the condition of the antenna configuration with the same spacing. Whereas, the efficiency is up to 0.88 if the optimized spacing is adopted. results indicate that the heating mode can be governed by optimizing the heating distance, as well as selecting the app

关键词： Heavy oil production

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Status and influence of shale gas well integrity failure

Status and influence of shale gas well integrity failure

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Chinese Materials Conference, 2018

作者： Zhai, Wenbao Li, Jun Xi, Yan Liu, Gonghui Zhou, Yingcao College of Petroleum Engineering China University of Petroleum Beijing China Beijing University of Technology Beijing China CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9783035713848

The well integrity issues have a direct impact on improving single well production of shale gas horizontal wells. reviewing the domestic and foreign literature researches, the development status of major shale gas blocks at home and abroad were introduced. Well integrity failure characteristics of major shale gas blocks at home and abroad were counted and analyzed in detail. Finally, considering the shale gas development in China as an example, the structural integrity (casing deformation) and seal integrity (Sustained Casing/Annulus pressure, SCP/SAP) were analyzed by clarifying the failure mechanism from the view of well integrity issues affecting shale gas production. It is considered that shale gas well integrity issues in China are a new problem and the failure mechanism of shale gas well integrity needs to be further clarified, and a complete set of failure prediction and control methods has not yet been formed. Therefore, based on the concept of shale gas geology-engineering integration, considering the actual conditions of shale gas development blocks, it is proposed to scientifically and reasonably study the shale gas well integrity failure mechanisms and their control methods, which is the reference and guidance to improve shale gas development. © 2019 Trans Tech Publications, Switzerland.

关键词： Failure (mechanical)

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The influence of pre-existing weakness planes in rock on hydraulic fracturing 10

The influence of pre-existing weakness planes in rock on hyd...

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10th Asian rock Mechanics Symposium, ArMS 2018

作者： Zhai, Wenbao Li, Jun Chen, Zhaowei Zhou, Yingcao China University of Petroleum Beijing China CNPC Engineering Technology R and D Company Limited Beijing China

ISBN: (纸本)9789811190032

Many weakness planes (such as faults, joints, and micro-fractures, etc.) are usually pre-existed in rock. However, the stress statement changed by hydraulic fracture (HF) propagation may have an important impact on hydraulic fracturing, which is closely related to stress statement of weakness planes. Firstly, the rock samples containing the pre-existing weakness planes were analyzed according to the curves of volumetric strain versus stress difference acquired by laboratory experiment. Secondly, the effective normal stress and shear stress of weakness planes were calculated by the tensor transformation method. And then, weakness planes were divided into four kinds according to the relationship between stress statements of weakness planes and failure lines of Mohr diagram and the kinds of weakness planes were visually described in the Mohr diagram. Finally, it was respectively discussed that pre-existing weakness planes did have an influence on hydraulic fracturing under different stress statements. The research results show that when the effective stress is more than zero, with the effective stress decrease, weakness planes are the more easily inclined to become the dilatation phenomenon where the self-propping effect can improve the reservoirs permeability due to surface asperities of weakness planes. However, there are very complex mechanical phenomena induced by weakness planes under higher effective stress. When hydraulic fractures encounter the pre-existing weakness planes under the approximate stress statement, it may be easy to occur shear slipping of weakness planes or it is difficult to be opened by hydraulic fractures. The latter is extremely beneficial to not become the maximum simulated reservoir volume (SrV) and should be avoided by fracturing operation as early as possible. It is somewhat different that the influence of different mechanical phenomena on hydraulic fracturing, which has a certain guidance for improving hydraulic fracturing stimulation. ©

关键词： Hydraulic fracturing

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Accelerating geological gas storage simulations: A novel and efficient gases-brine phase equilibrium calculation algorithm

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renewable Energy 2025年 252卷

作者： Chaojie di Yizheng Wei Haoming Ma Peng deng Benjieming Liu Kun Wang Long Peng Zhangxin Chen University of Calgary 2500 University Dr NW Calgary AB Canada Computer Modelling Group Ltd. 3710 33 St NW Calgary AB Canada Hildebrand Department of Petroleum and Geosystems Engineering University of Texas at Austin Austin TX 78712 USA Ningbo Institute of Digital Twin Eastern Institute of Technology 568 Zhuangshi St Zhenhai District Ningbo Zhejiang PR China *** Inc. 40 King St W 47th Floor Toronto ON Canada CNPC R&D (DIFC) Company Limited Dubai 415147 United Arab Emirates

Geological carbon sequestration (GCS) and gas energy storage in water-bearing formations, one of the most promising methods of Carbon Capture, Utilization, and Storage (CCUS), offers a permanent and reliable solution for mitigating climate change. Although reservoir simulation is widely employed to evaluate GCS projects, its high computational cost, driven by the complexity of phase equilibrium calculations, poses a challenge to obtain timely assessments. To address this, we propose an innovative Adaptive Saturated Composition (ASC) algorithm to bypass unnecessary stability analyses, therefore reducing the computational expenses of gases-brine phase equilibrium calculations in GCS simulation. The ASC algorithm relies on pre-calculated binary gas-brine data and is extended to multicomponent systems (CH 4 , N 2 , H 2 S, CO 2 ) through a mixing rule. We performed extensive tests under varying underground conditions, demonstrating that the proposed ASC algorithm offers superior efficiency, accuracy and scalability compared to existing algorithms. It eliminates over 99.9 % of unnecessary stability analyses in binary systems and reduces their frequency by over 93 % in multicomponent gas systems. remarkably, the ASC algorithm achieves accurate detection of phase transitions across all tested scenarios. Moreover, it is widely applicable in most of water-bearing geological gas storage scenarios, including natural gas storage, geological CO 2 /air energy storage, and CO 2 -based geothermal systems.

关键词： Gases-brine fluid model Geological gas storage Numerical reservoir simulation Stability analysis bypassing

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True 3d Fracture Simulation with Geology-engineering Integration of Volume Modification in Jimsar Shale Oil

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IOP Conference Series: Earth and Environmental Science 2021年第2期714卷

作者： Kui Zhang Yang Xiao Leiming Cheng Shouyu Liu Junchao Wang Mingqiang Xu Engineering Technology Research Institute Xinjiang Oilfield Company PetroChina Karamay China CNPC Engineering Technology R&D Company Limited Beijing China School of Energy Chengdu University of Technology Chengdu China Chengdu Institute of Technology Sunshine Energy Technology Co. Ltd. Chengdu China Shale oil Project Management Department Development Company PetroChina Xinjiang Oilfield Company Karamay China

The main characteristics of Jimsar shale oil reservoir are of complex structure, strong heterogeneity and great difficulty in fracturing. It is mainly produced by volume fracturing technology, which is easy to form complex fracture networks. At present, the design and parameter optimization of fracturing scheme are not targeted, and the true 3d fracture simulation with geology-engineering integration is particularly important. On the basis of 3d geological modeling, the 3d geo-mechanical parameter distribution is determined by seismic data, logging data, experimental data, etc to simulate the stress environment in which the overburden pressure, surrounding rock pressure and lower strata pressure. And the 3d geo-mechanical parameter model is established by combining simulated analysis of the stress. On the basis of geological model, geomechanical model and natural fracture model, the natural fractures and faults determined by seismic, logging or discrete fracture modeling are integrated into the geomechanical model to complete the true 3d simulation of artificial fracture network based on true 3d geo-mechanical model. This simulation is the practice and improvement of the geology-engineering integration of shale oil reservoirs volume modification technology in Jimsar, which will deepen the geological understanding and strengthens the engineering technology supporting, provides reference basis for the optimization design of fracturing process and the maximization of the volume, and finally realizes the efficient development of shale oil in Jimsar.

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Full-Life-Cycle Analysis of Cement Sheath Integrity

Full-Life-Cycle Analysis of Cement Sheath Integrity

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中国石油集团工程技术研究院有限公司首届青年论文报告会

作者： Shen Jiyun Zhou Shijie Ji Hongfei Qi Fengzhong CNPC Engineering Technology R&D Company Limited CNPC Engineering Technology R&D Company Limited China University of Petroleum Beijing

This paper addresses evaluating the evolution of stress inside the casing-cement sheath-formation system during the cement-injecting,setting,completion and production *** full-life-cycle analysis of cement sheath integrity gives rise to as-sessment of potential failure mode(i.e.,tensile-mode,shear-mode,and micro-annu-lus)in different stages,and the prevention measures accordingly can be *** the loading history,two regimes should be *** the accomplishment of cementation,as the cement slurry can merely withstand its hydraulic pressure,the in-situ stress and the wellbore pressure are withstood by the rock and the casing,*** the cementation process is completed,the stress increment (e.g.,hydraulic fracturing pressure)is withstood by the casing-cement sheath-formation *** autogenous shrinkage of cement adversely affects the resistance of the system to shear failure,tensile failure and micro-annulus,whereas a moderate swelling of cement is beneficial to the cement sheath *** addition,the cement sheath integrity is strongly influenced by the depth: the failure is encountered more easily at shallow *** the hydraulic fracturing pressure in the completion stage and the in-crease in casing temperature in the production stage may lead to tensile circumferential stress,and the hydraulic fracturing is the most critical stage for the integrity of cement sheath.

关键词： cement sheath integrity casing-cement sheath-formation system shrinkage of cement hydraulic fracturing increase of casing temperature

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Hybrid Effects of Nano-silica and Graphene Oxide on Mechanical Properties and Hydration Products of Oil Well Cement

Hybrid Effects of Nano-silica and Graphene Oxide on Mechanic...

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中国石油集团工程技术研究院有限公司首届青年论文报告会

作者： Liu Huiting CNPC Engineering Technology R&D Company Limited

Hybrid effects of nano-silica and graphene oxide on mechanical properties of oil well cement have been *** cement hydration characteristics with the addition of nano-materials (NS and/or GO)were also examined by means of TGA,Xrd,SEM and *** results showed the designed hybrid structure was benefi-cial for SiO2 and GO nano-particles to disperse well in alkaline *** compressive and flexural strength of cement with hybrid nano-materials of 1.5% NS and 0.03% GO was increased by 43.2% and 42% with 28 days of curing respectively,which was far bet-ter than cement with single NS or *** oxide and nano-silica have a hybrid effect including better dispersion of nano-materials,higher degree of hydration and pozzolanic reaction,and network structure formation of hydration products,all of which were benefi-cial to reinforcing the mechanical properties of cement.

关键词： nano-silica graphene oxide oil well cement mechanical properties hydration products

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The Optimization design for Subsea Construction Using Non-Linear Finite Element Analysis

The Optimization Design for Subsea Construction Using Non-Li...

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中国石油集团工程技术研究院有限公司首届青年论文报告会

作者： Cao Chuan CNPC Engineering Technology R&D Company Limited

As the oil and gas industry is moving into drilling and production operations in much deeper waters and harsher environments,there is a great demand to de-velop the next generation tools and technology to meet these *** environments in which subsea system working on must operate are necessarily *** the development of such system involves careful consideration of the environmental and operational *** Finite Element Analysis (FEA) model for such system is established in a realistic way,it not only allows designs to be undertaken for complex scenarios that were not previously possible,but also gives the designer to have more opportunities to design the subsea system both safe and cost *** paper presents three latest subsea system de-signs based on *** first part focus on the improvement of seal structure design,which takes into account the proper relationships between the size and shape of the metal sealing units to achieve effective seal based on ABAQUS,thereby reducing the possibility of seal failure caused by improper distribution of structural *** second part is the design of a new pull-up metal-to-metal seal suitable for subsea wellheads,this design involves special structure differed from earlier ***'s actuated by pull-up force which obtained from the drill *** last one demonstrates how FEA can be used to verify the reliability of connec-tion system of subsea running tool,as it ensures that the load transfer and interactions be-tween the running tool and wellhead are properly accounted for during *** above analysis tool allows solving some of the most complex engineering problems,and in some cases has allowed significant cost savings to be achieved in the engineering field.

关键词： subsea construction non-linear FEA analysis

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Utilization of Bisphenol-A residue as a raw Material for drilling Fluids Additive

Utilization of Bisphenol-A Residue as a Raw Material for Dri...

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中国石油集团工程技术研究院有限公司首届青年论文报告会

作者： Zhang Zhilei Yang Zheng Li yingying Li long Li shuang Feng jie Wang ren CNPC Engineering Technology R&D Company Limited

In this work,the residues mixture from Bisphenol A manufacturing process was *** transform infrared (FTIr) spectroscopy,gas chromatography-mass spectrometry (GC-MS),and nuclear magnetic resonance (NMr) were used to characterize the *** results indicated that the residues were complex mixture of several *** feasibility of using it to replace phenol in fluid-loss-con-trol additive and high temperature viscosifier production was also *** shows that well performance of the prepared additive can be achieved,and especially at high temper-ature.

关键词： Bisphenol-A residue mixture spectroscopy analysis drilling fluid additive low cost

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