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Study on sealing integrity mechanism of salt cavern hydrogen storage under alternating load 57

Study on sealing integrity mechanism of salt cavern hydrogen...

引用

57th US rock Mechanics/Geomechanics Symposium

作者： He, Aiguo Ma, Qingyuan Liu, Tianen Li, Jingcui Zhang, Hong dai, Kun Lu, Yunhu CNPC Engineering Technology R&D Company Limited Beijing China China Unversity of Petroleum Beijing China

ISBN: (纸本)9780979497582

The sealing integrity of salt cavern hydrogen storage is an important technology and safety index of hydrogen storage. In the process of injection and production, the surrounding rock of hydrogen storage chamber is in the state of alternating load stress, and there is the risk of fatigue failure and leakage. Analysis of dynamic rock mechanics characteristics of surrounding rock of salt cavern hydrogen storage chamber under alternating load is the key to study the sealing integrity mechanism of salt cavern hydrogen storage chamber. Uniaxial tests, triaxial tests, cyclic loading and unloading tests and creep tests were carried out on rock samples from salt layer, interlayer and cap layer of hydrogen storage reservoir of Jintanmao 17 well by means of rock mechanics experimental machine rTr-1500. The deformation and failure characteristics, permeability, porosity, breakthrough pressure and other parameters of rock samples under alternating loads were discussed. Based on the results of the creep test, the Burgers creep model parameters for this block were fitted. The results show that: (1) in the triaxial cyclic loading and unloading experiment, the cyclic loading and unloading before the yield point decreases the porosity and permeability of the rock sample, while the cyclic loading and unloading after the yield point increases the porosity and permeability of the rock sample.(2) In the process of cyclic loading and unloading, the dissipative energy of cap rock is greater than that of interlayer, and with the increase of cycle times, the dissipative energy first decreases and then becomes stable.(3)Burgers creep model can well reflect the creep law of salt formation in the target block, and can be used to study the long-term stability of hydrogen storage cavity. The research results provide a scientific basis for the design and operation of salt cavern hydrogen storage. © 2023 57th US rock Mechanics/Geomechanics Symposium. All rights reserved.

关键词： Creep

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Experimental and Numerical Study on Transient Heat and Mass Transfer of Cryogenic Fluid in Wellbore during Cryogenic Fracturing 55

Experimental and Numerical Study on Transient Heat and Mass ...

引用

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

作者： Zhang, Hongyuan Zou, Lingzhan Zhuo, Lubin Bi, Wenxin Li, Bing Yu, Jing Huang, Zhongwei CNPC Engineering Technology R&D Company Limited Beijing China China University of Petroleum Beijing China

ISBN: (纸本)9781713839125

Cryogenic nitrogen is a promising hydraulic fracturing fluid with high cracking efficiency for tight formation reservoir. Predicting the temperature field in wellbore accurately is of great importance for the feasibility evaluation and parameters design of cryogenic fracturing. A laboratory experiment is conducted to investigate the heat transfer intensity of liquid nitrogen (LN2) in a circular tube under conditions similar to fracturing. A prediction model of heat transfer coefficient for LN2 is derived. A transient numerical model is developed to simulate the fluid flow and thermal behaviors of liquid nitrogen in the tubing. The transient heat and mass transfer characteristics of liquid nitrogen in tubing during cryogenic fracturing is simulated. The downhole fluid temperature is calculated and the temperature distributions in the fracturing string and annulus are obtained as a function of time. The typical temperature curve for downhole fluid is presented as well. The results showed that the co-injection fracturing pattern adopted in filed for cryogenic fracturing has inherent shortcomings. It can’t transport LN2 effectively to well bottom. High pressure in annulus improves the heat transfer between annulus fluid and fracturing string, which result in a dramatic decrease on the casing temperature, and would induce a low temperature damage to cement sheath. © 2021 ArMA, American rock Mechanics Association.

关键词： Flow of fluids

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Study on the loss control performance of smart adhesive lost circulation materials with ethylene vinyl acetate copolymer (EVA) 2

Study on the loss control performance of smart adhesive lost...

引用

2nd International Conference on Advanced Materials and Intelligent Manufacturing, ICAMIM 2021

作者： Lei, Shaofei Bai, Yingrui Sun, Jinsheng Lv, Kaihe Zhang, Shupei Qiu, Jiaxian Shandong Qingdao266580 China CNPC Engineering Technology R&D Company Limited Beijing102206 China

The conventional lost circulation materials (LCMs) particles of seal in the formation are in linear contact. Therefore, there is no cohesive force interaction, which is susceptible to pressure fluctuations, resulting in lost circulation and control failure. In response to these problems, this paper tested the high-temperature adhesion properties of EVA in the viscous flow transition zone through high-temperature adhesion experiments;then a smart adhesive LCMs is prepared using thermoplastic EVA resin with conventional LCMs;finally, through the high-temperature and high-pressure plugging experiment, the system's performance for sealing fractures was tested. The experiment results show that the smart adhesive LCMs have good plugging performance and can bond LCMs in the fracture to form a high-strength sealing with a pressure-bearing capacity of up to 9.3MPa. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Adhesives

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Integrated research on Well Structure technology of High risk Pre-salt deep Wells in Amu darya river 12th

Integrated Research on Well Structure Technology of High Ris...

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12th International Field Exploration and development Conference, IFEdC 2022

作者： Gu, Yixin Zhang, Wei Zhou, Tuo Baletabieke, Bahedaer Xiao, Yue CNPC Engineering Technology R and D Company Limited Beijing China

ISBN: (纸本)9789819919635

The Amu darya river natural gas project is a major energy cooperation project between China and Turkmenistan, as well as the main gas supply source for the China-Central Asia natural gas pipeline. It is rich in natural gas resources, ranking first in Central Asia and fourth in the world. The smooth implementation of the project will play an exemplary and leading role in promoting win-win cooperation in various fields among countries along the Belt and road. Many drilling difficulties such as shallow secondary high pressure gas reservoir drilling, directional drilling in ultra-thick salt-gypsum formation, drilling acceleration in hard gypsum layer, have been solved through the special researches in the past 10 years. However, along with the development of the Block which has entered into the middle and later periods, the production rate of some wells has decreased to 150,000-200,000 m3/day. due to narrow safe-density window between salt-gypsum layer and high pressure fractured-vuggy carbonate reservoir, mud loss coexist with blow out is becoming more frequent. The only choice to avoid this problem is finish the well ahead the schedule, which gave rise to shorter the horizontal section length less than the half of the designed. Based on the consideration of great reservoir pressure variation, large production discrepancy among wells and unvaried well structure for many years, this paper optimized the casing program to a smaller size, which is helpful to reduce the drilling cost and enhance the penetration rate for Amu darya gas project. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.

关键词： Gases

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development of Balanced Torque drilling Tools 12th

Development of Balanced Torque Drilling Tools

引用

12th International Field Exploration and development Conference, IFEdC 2022

作者： Qiao, Han Cheng, Jin Shao, Qiang Li, Xing-Yue CNPC Engineering Technology R and D Company Limited Beijing China

ISBN: (纸本)9789819919635

drilling of hard formations (especially interlayer) by PdC bits is frequented by severe stick slip and bit bouncing/jumping, and low rOP and short service life of PdC bit restrict the efficient development of difficult-to-drill formations such as those in deep wells. Based on real-time optimization of drilling torque and WOB of PdC bit, and through design parameter matching calculation, lab test and field application, a balanced torque drilling tools that can realize the "peak load shifting" of torque fluctuations was developed. The tool adopts the mechanical transmission mode of spring+spiral guide mechanism by storing and releasing abnormal torque generated during drilling operations, it can realize real-time adjustment of drilling torque movements. The balanced torque drilling tools has been successfully applied in 5 wells of Jilin Oilfield, Changqing Oilfield and Jidong Oilfield, reducing the wellhead torque fluctuation by more than 70% and increasing the footage of bit by more than 100% in conglomerate formations. The balanced torque drilling tools can adaptively optimize the drilling torque, and thus it is well performed in bit protection and rOP enhancement, it also has the advantages of strong applicability, high reliability and low maintenance cost of bit and drilling fluid media. Its successful application can effectively enhance rOPs and shorten the drilling period in hard and complex formations. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.

关键词： Stick-slip

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Improvement and Test Analysis of Multilateral Well technology with Expandable Tubular Positioning 12th

Improvement and Test Analysis of Multilateral Well Technolog...

引用

12th International Field Exploration and development Conference, IFEdC 2022

作者： Hu, Zhi-Jian Wang, Jun Liang, Guo-Hong CNPC Engineering Technology R and D Company Limited Beijing China

ISBN: (纸本)9789819919635

Multilateral well technology is expected to become an effective means to realize the three-dimensional and efficient development of massive carbonate reservoirs in Halfaya oilfield. Multilateral well technology with expandable tubular positioning has the advantages of accurate and reliable positioning and simple operation, but it has shortcomings in terms of expansion resistance treatment, whipstock fishing and wellbore connection, which may lead to the failure of multilateral well operation. Therefore, in the paper, based on the original technology, the expansion positioning tool, whipstock and wellbore connection method were improved and tested. A releasable expansion positioning tool was designed, so as to take out the downhole string by dropping release at the time of expansion resistance and take remedial measures;by means of optimizing the structure and fishing method of the whipstock, the risk of fishing failure caused by mechanism blockage due to cuttings settlement was reduced, and the success rate of fishing was improved;moreover, the scheme of connecting the main and lateral wellbores after cementing by temporary blocking window or milling window method was designed and verified, which provided an effective method to improve the completion quality and success rate of multilateral well. The above scheme provides a helpful reference for solving the shortcomings of the current multilateral well technology with expandable tubular positioning and developing a multilateral well system suitable for the development of Halfaya oilfield. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.

关键词： risk assessment

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Planning Model and Optimization Method of Seven-Section Well-Path for Three-dimensional Horizontal Wells 12th

Planning Model and Optimization Method of Seven-Section Well...

引用

12th International Field Exploration and development Conference, IFEdC 2022

作者： Tang, Xue-Ping Gao, Wen-Kai dou, Xiu-rong Peng, Lie-Xin Lv, Hai-Chuan CNPC Engineering Technology R and D Company Limited Beijing China

ISBN: (纸本)9789819919635

In order to reduce the difficulty of trajectory control for three-dimensional horizontal wells in shale oil and gas fields, a seven-section well-path planning model for three-dimensional horizontal wells is established, and the solving method is studied. According to the application requirements, the design parameters are classified into 3 categories and 18 common parameter combinations. Because the parameter constraint equation is a multivariate nonlinear equation system, it involves many variables and is difficult to solve. For this reason, based on the five-section three-dimensional circular arc well-path model, the analytical formulas of two parameter combinations for the seven-section well-path model are obtained, and then the piecewise iterative method is used to solve other parameter combinations. An optimization method of seven-section well-path planning is further discussed for three-dimensional horizontal wells. Based on the analytical formulas of the seven-section model, according to the constraints, the design parameters are selected for multi-scan solving, and then the solution results are checked and compared, which better solves the multivariate nonlinear constraint optimization calculation problem. According to the model and solving method in this paper, a seven-section well-path design program is developed for three-dimensional horizontal wells. The case study shows that the model in this paper is universal, the solution and optimization method is simple, effective and practical, the calculation is accurate, and it is easy to program and realize, which has the value of popularization and application, and provides technical support for the optimal and fast drilling of three-dimensional cluster horizontal wells in shale oil and gas fields. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.

关键词： Iterative methods

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research on graphene oxide modified polymer as multifunctional filtration reducer for oil-well cementing

Research on graphene oxide modified polymer as multifunction...

引用

Chinese Materials Conference 2022-2023

作者： Xu, P. Xia, X.J. Jin, J.Z. Yu, Y.J. Zhang, J.Y. Zhang, H.Z. CNPC Engineering Technology R and D Company Limited Beijing China

Conventional filtration reducers have limited utility in cementing at deep oil and gas fields because of their poor temperature resistance and single function. As a novel multifunctional filtration reducer, graphene oxide-modified polymer GO-PAdI was developed by radically copolymerizing 2-acrylamido-2-methylpropane sulfonic acid (AMPS), N, N-dimethyl acrylamide (dMAM) and itaconic acid (IA) between graphene oxide sheets. The microstructure of GO-PAdI was confirmed through the utilization of different methods such as fourier transform infrared spectroscopy (FT-Ir). The performance evaluation results showed that GO-PAdI had the high thermal stability, and could control filtration of cement slurry as conducted by the American Petroleum Institute (API) less than 50 mL, which is 17 % lower than that of the traditional filtration reducer PAdI. GO-PAdI could increase compressive strength of cement stone by 30.3 %, and decrease elastic modulus by 10.9 % in three-day curing period. GO-PAdI has the multifunctional functions of reducing fluid loss, strengthening and toughening, and can effectively improve the engineering performances for high-temperature cement slurry. © Published under licence by IOP Publishing Ltd.

关键词： Gas industry

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development of Intelligent drill Pipe for Power Supply and Communication 12th

Development of Intelligent Drill Pipe for Power Supply and C...

引用

12th International Field Exploration and development Conference, IFEdC 2022

作者： Han, Fei Wang, Ai-Guo Hu, Zhi-Jian Wang, Hong-Wei Qiao, Han CNPC Engineering Technology R and D Company Limited Beijing China

ISBN: (纸本)9789819919635

Power supply and communication intelligent drill pipe is a bridge to realize high-speed two-way information communication and power transmission between ground and underground. In order to realize intelligent electrification and informatization of drilling, the ground and underground cables are connected by the way of built-in cableâ€‰+â€‰wet joint in the water hole of conventional drill pipe, and the two-way coupling transmission of power and communication signals is realized through power wave carrier and downhole adapter. Through the simulation and optimization design of key components such as wet joint and the testing of sealing, insulation and signal communication performance of drill pipe system, an intelligent drill pipe for power supply and communication is developed. The tool adopts contact power supply and communication mode, and the performance of 3000 m non relay communication and sealing and insulation reliability in severe water immersion environment have been verified. The tool has been tested in real drilling. The 150 m long wet joint cable only brings about 3 dB attenuation of carrier signal, and the power supply and communication performance are reliable. The development of this drill pipe is of great significance to promote the construction of Intelligent Long-distance non relay high-speed two-way communication channel for drilling automation and the development of accurate control of drilling tool electrification. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.

关键词： drills

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Studies on Lost Circulation risk of deep Shale Formation Based on Fracture Prediction and rock Mechanical Properties 56

Studies on Lost Circulation Risk of Deep Shale Formation Bas...

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56th U.S. rock Mechanics/Geomechanics Symposium

作者： Wen, Bo Wang, Yuan Chen, Gang Zhang, Peiyu Guo, Kaijie Fu, Li Feng, Ming Yang, Henglin Zhong, Chengxu PetroChina Southwest Oil&Gasfield Company Chengdu China CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9780979497575

Lost circulation is a technical problem in drilling engineering, resulting in increased drilling cost and extended drilling cycle. reservoir rocks in Block A of Shale Gas have the characteristics of low porosity and low permeability, strong heterogeneity and fault fracture development. Lost circulation is mainly caused by fracture. Seismic fracture prediction to assess lost circulation risk has limitations. Therefore, it is necessary to study more effective methods of lost circulation risk assessment. In this paper, based on the analysis of lost circulation, seismic prediction on fractures and rock mechanics parameters in block A, a comprehensive evaluation method of lost circulation index is formed by using seismic prediction of the relative degree of fracture development, fracture apparent length and the combination of Young's modulus and Poisson's ratio in 3d attribute modeling, and the classification evaluation standard is established. The method is used to evaluate the lost circulation risk of completion drilling in shale gas well of Block A, and the evaluation results are consistent with the well drilling data. Lost circulation index evaluation method can effectively evaluate the risk of lost circulation in shale formation with low porosity and low permeability, strong heterogeneity and fracture development, which can promote the efficient development of shale gas. © 2022 ArMA, American rock Mechanics Association.

关键词： Forecasting

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