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

作者： dong, J.N. Jin, G.T. Liu, T.E. Qiu, K.X. Wei, S.M. CNPC Engineering Technology R&D Company Limited Beijing102206 China Peking University Beijing102249 China Beijing102249 China

ISBN: (纸本)9781713839125

The mechanical properties of shale are greatly influenced by the fraction of organic matter in the shale. However, the effects of organic matter distribution on stress interference have not been well considered. Since parent- wells target "sweet spots,"infill wells (child wells) generally target an area with a lower porosity and permeability, which correspond to a higher organic matter content. This study investigates the influence of organic matter distribution on changes in horizontal principal stress. For the scenario with nonuniformly distributed organic matter, the infill well region is set as the organic-rich region. A fully coupled numerical model considering the whole flow spectrum of shale gas and the shrinkage of organic matter is built. Some conclusions are drawn from the simulation results;for example, the shrinkage of organic matter enlarges the alteration angle of the maximum horizontal principal stress orientation and the magnitude of the minimum horizontal principal stress. However, the effect of organic matter on the alteration angle of the maximum horizontal principal stress is basically negligible after 3 years of production. The magnitude and orientation of the horizontal principal stresses experienced more modest changes in the infill well region with nonuniformly distributed organic matter than in that with uniformly distributed organic matter. Copyright © 2021 ArMA, American rock Mechanics Association.

关键词： Shale gas

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Simulation Experiment of Sediment Sealing in Old Well of Underground Gas Storage (Ugs)

SSRN

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SSrN 2024年

作者： Zhang, Yuda dong, Jingnan Liu, Tianen Guan, Yueyang Ban, Fansheng Yuan, Guangjie Research Institute of Petroleum Exploration & Development PetroChina Beijing100083 China CNPC Engineering Technology R&D Company Limited Beijing102206 China National Engineering Laboratory of Petroleum Drilling Technology Beijing102206 China National Elite Institute of Engineering CNPC Beijing100096 China

UGS is the key place to ensure the stable supply of natural gas, and the plugging effect of old wells will be seriously affected due to its characteristics of strong and alternating injection and withdrawal. In order to study the plugging of old wells with fishing and buried by sediment, a full-scale wellbore sediment sealing simulation experiment and a small-scale core permeability experiment were designed. Considering the factors such as sediment composition, compaction degree and metal surface roughness, the compaction law of fillers and the change law of permeability with rock cuttings content under different top hydraulic conditions were analyzed. The experimental results show that there are two kinds of sealing failure in old wells. One is gas breakthrough, the breakthrough pressure difference is 1.3-2.7 MPa, the breakthrough time is about 30 s, and the dominant channel is the interface between sediment and casing and fishing. The other is gas leakage. The permeability range of the sediment is 0.0024-0.031 d, and the reservoir gas flows along the pore channel of the sediment. This study simulates the sediment plugging old wells in the range of gas storage site, and provides reference for the sealing failure process and mechanism of old wells. © 2024, The Authors. All rights reserved.

关键词： Sediments

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Simulation Experiment of Sediment Sealing in Old Well of Underground Gas Storage (Ugs)

SSRN

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SSrN 2024年

作者： Zhang, Yuda Yuan, Guangjie dong, Jingnan Liu, Tianen Guan, Yueyang Ban, Fansheng Research Institute of Petroleum Exploration & Development PetroChina Beijing100083 China CNPC Engineering Technology R&D Company Limited Beijing102206 China National Engineering Laboratory of Petroleum Drilling Technology Beijing102206 China National Elite Institute of Engineering CNPC Beijing100096 China

关键词： Sediments

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Identification of shale bedding layers from micromechanical evaluation

Identification of shale bedding layers from micromechanical ...

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SPE Annual Technical Conference and Exhibition 2021, ATCE 2021

作者： Cheng, Shizhong Sheng, Mao Chen, Zhaowei Tian, Shouceng Li, Gensheng State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum-Beijing China CNPC Engineering Technology R&D Company Limited

ISBN: (纸本)9781613997864

Bedding layers are well-developed in shale and recognized to enhance the complexity of the hydraulic fracture network. A micromechanical evaluation approach of shale bedding layers based on indentation testing techniques was proposed. rock thin section identification and scanning electron microscope were utilized to describe the shale laminations. To capture high-resolution image with large area and ensure abundant morphology and mineral information, Atlas 5 system, which could create large mosaic images, was applied. Combined with FIB, a method for positioning the laminations in SEM and accurately navigate to it in the micromechanics experiment was established. Fractures were emphasized to be initiated and extend in the clay mineral layers. It can be explained that the flaky structure of clay mineral is beneficial for the extension of fracture. It will become more potential to connect with the fluid-driven fractures. Nanoindentation was conducted to obtain micromechanical properties in different lamination layers. results verify the feasibility of this scheme and demonstrate fine-grained, transition and coarse-grained layers. Indentation results show variation in micromechanical properties of coarse-grained layer, the transition layer and the fine-grained layers. The present work is helpful to identify shale bedding layers from micromechanical evalutions. © 2021, Society of Petroleum Engineers

关键词： Shale

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Flow numerical simulation of tubing or casing leakage in gas well

Flow numerical simulation of tubing or casing leakage in gas...

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Abu dhabi International Petroleum Exhibition and Conference 2020, AdIP 2020

作者： Zhang, Hong Yuan, Guangjie Li, Guotao Li, Jingcui Wan, Jifang Fu, Pan CNPC Engineering Technology R&D Company Limited Research Institute of Petroleum Exploration and Development CNPC Engineering Technology R&D Company Limited

ISBN: (纸本)9781613997345

Tubing or casing leakage of HTHP gas wells and underground gas storage wells affects wellbore integrity adversely. The wellbore micro-leakage detection technology can detect tiny fluid leakage in time and is of great significance to avoid malignant gas leakage accident. The theoretical basis of wellbore microleakage detection technology is characterizing the leakage flow field. To reveal the flow characteristics of gas leakage due to tubing and casing cracks and perforations, a CFd model of gas aperture leak has been established and flow field numerical simulation of high-speed and high-pressure gas outflow through aperture was conducted. The standard k-e turbulence model was used to calculate and analyze the pressure and velocity distribution of the steady flow field. In addition, a time step was set on the steady-state model and the Scale-Adaptive Simulation (SAS) model was adopted to simulate the transient flow field with the initial conditions of the steady-state simulation results. The effects of the shape and size of the leakage hole, the pressure inside the pipe, and the medium in the outer annular space on the flow field were analyzed. The results show that obvious turbulence disturbance appears near the inlet of the leakage hole and supersonic under-expansion jet forms near the outlet of the leakage hole under the gas well working conditions, creating the expansion wave and shock wave. The flow velocity of gas leakage through the circular hole is the highest, while that of the slot hole is the lowest under the same conditions. The larger the leakage aperture is, the greater the pressure difference between inside and outside of the pipe is, and the more drastic variation of gas velocity in the leakage hole. The method and results provide theoretical guidance for the microleakage detection technology of gas well wellbore. © 2020, Society of Petroleum Engineers

关键词： Flow fields

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Achieving Improved drilling Performance with Hole Cleaning technology in Horizontal Shale Gas Wells in Sichuan Basin of China

Achieving Improved Drilling Performance with Hole Cleaning T...

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2021 International Petroleum technology Conference, IPTC 2021

作者： Ji, Guodong Wang, Haige Huang, Hongchun Cui, Meng Yulong, Feixue Ma, Ying Sun, Xiaofeng CNPC Engineering Technology R&D Company Limited Research Institute of Petroleum Exploration and Development PetroChina China Northeast Petroleum University China

ISBN: (纸本)9781613997314

The horizontal section length of shale gas horizontal wells in Sichuan Basin in the south-west of China generally exceeds 2000m. Cuttings are apt to accumulate and form cuttings beds along such long and curve horizontal sections due to low cuttings carrying capacity, which often results in excessive torque and drag or even stuck pipes during drilling process. According to the statistics dada inthe period of Jan. - Oct. 2019, more than 25 stuck pipe incidents and 15 rotary steering tools loss in borehole were reported due to inefficient cuttings transportation in the long horizontal wells in Sichuan Basin. This paper studies the cuttings transportation and cuttings bed formation in horizontal wells. A prediction model for the distribution of cuttings bed was established. A monitoring and analysis software for the cuttings bed and cuttings cleaner with V-shaped spiral blades that is used to agitate the cuttings bed wasdeveloped. The software calculates the distribution and thickness of the cuttings bed according to the well trajectory, wellbore structure, drilling fluid characteristics, etc., and provides the optimal operating parameters for the removal of the cuttings bed by the rotating and reciprocating drill string. Then, the drill cuttings remover in the drill string moves to the predicted position of the drill cuttings, scrapes the drill cuttings and creates a swirling flow during the pipe rotation. The combined application of software and makeup remover can effectively solve the issue of borehole cleaning in long horizontal wells. One of the field applications was carried out in the well Ning 209H12, a shale gas horizontal well in Sichuan Basin. The well experienced excessive torque and drag issue during the tripping of drill string of long horizontal section. Thesoftware ran based on oil well data, and it determines the placement and thickness of cuttings beds in the well and calculates the optimal operating parameters for a flow rate of about 32L/s and a spee

关键词： Horizontal wells

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An On-Line Inductance Identification Method for Permanent Magnet Synchronous Motors Under Sensorless Control in The Full Speed domain 10

An On-Line Inductance Identification Method for Permanent Ma...

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10th IEEE International Power Electronics and Motion Control Conference, IPEMC 2024 ECCE Asia

作者： Liu, Yue Wang, Liguo Gao, Qiang Li, Yong Fei, E. Shanghai Jiao Tong University Department of Electrical Engineering Shanghai China State Grid Suzhou Power Supply Company Substation Maintenance Center Suzhou China Contemporary Amperex Electric Vessel Technology Co. Limited Department of R&d Ningde China Contemporary Amperex Electric Vessel Technology Co. Limited Department of Technology Ningde China

ISBN: (纸本)9798350351330

This work presents an online inductance identification method for permanent magnet synchronous motors in the full speed domain. Online inductance estimation is realized by injecting two modified high-frequency square wave voltage signals into the d-q axis simultaneously. This method can achieve high-precision identification of inductance in the full sensorless speed domain. The simulation results show that the inductance identification accuracy of this method can reach ±4% whether under constant loading, sudden addition and subtraction loading or dynamic loading. © 2024 IEEE.

关键词： Inductance

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Evaluation of Well Performance of Child Wells with Complex Fracture Hits from Parent Wells 55

Evaluation of Well Performance of Child Wells with Complex F...

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

作者： Liu, Chuxi Liu, Ziping Shen, Jianguo Zhang, Ping Wang, Yonghong Yang, Zhenzhou Yu, Wei Sepehrnoori, Kamy The University of Texas at Austin AustinTX United States CNPC Chuanqing Drilling Engineering Company Limited Chengdu China CNPC Engineering Technology R&D Company Limited Beijing China Sim Tech LLC HoustonTX United States

ISBN: (纸本)9781713839125

An efficient numerical method using simple structured grids for accurate modelling of shale production with complex hydraulic fractures and natural fracture networks is very important to evaluate the impacts of frac hits. In this study, we applied a powerful non-intrusive EdFM (Embedded discrete Fracture Model) method in conjunction with a traditional reservoir simulator with structured grids to simulate shale gas production under different degrees of frac hits. Through the non-intrusive EdFM method, natural fractures that are connected with primary hydraulic fractures can be easily embedded into the structured grids without the need of unstructured grids and local grid refinement. We built a field-scale shale gas reservoir model with a parent/child horizontal well set and a stochastic distribution of inter well natural fractures. We performed a short term (3-year) production simulation with a flowing bottomhole pressure constraint that has a similar decline trend to the field observation. The gas flow rate and cumulative gas production for the three designed frac hits scenarios are plotted and compared. In addition, pressure distributions in matrix and fractures, and drainage volumes for the three designed scenarios after 1 year and 3 years of production are visualized and compared. Understanding the impact of inter well frac hits on well performance in shale reservoirs with the non-intrusive EdFM method provides significant insights for the spacing/drilling job optimization of unconventional resources. © 2021 ArMA, American rock Mechanics Association

关键词： Stochastic systems

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Understanding and research on the drilling fluid technology for shale gas horizontal wells in south Sichuan, China

Understanding and research on the drilling fluid technology ...

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International Petroleum technology Conference 2020, IPTC 2020

作者： Yan, Lili Wang, Jianhua Zhang, Jiaqi Cheng, rongchao Yang, Haijun Yang, Haowei CNPC Engineering Technology R&D Company limited China

ISBN: (纸本)9781613996751

recently, shale gas resource has been developed beneficially on a large scale in China. More than 400 shale gas horizontal wells have been drilled in south Sichuan since 2014. However, with the increasing buried depth of target stratum and the extension of horizontal intervals of shale-gas horizontal wells, the development of Chinese shale gas is becoming more and more difficult. Over the past four years, some wellbore instability related issues–stuck pipe and rotary steering system fish downhole occured during drilling the shale gas wells. The reason is particularly analyzed based on the drilling performance data of these horizontal wells, which will offer the establishment of general practice guidelines and recognition of opportunities for improvement in south Sichuan shale drilling. Oil-based drilling fluid (OBM) is a typical drilling fluid type currently used in the south Sichuan shale play. However, water-based mud (WBM) has also been used in more than 60 wells since 2015. It is analyzed the drilling performances of over four hundred horizontal south Sichuan shale wells drilled by 14 operators from 2014 to 2018, including overall drilling days, well depth, lateral length, as well as fish rotary steering systems. A comparative analysis is also made among different drilling fluid types of different operators to assess their performances and to identify the key challenges when drilling south Sichuan shale. The analyses contained formation characteristics, mud chemistry, mud rheological property, plugging property, solid content, stability, density and chloride and so on. Then, lots of experiments are carried out to solve the problems of borehole stability and hole cleaning. The analysis shows that the drilled well depth and the horizontal length are getting bigger and bigger. The overall performance of WBMs lags behind that of OBMs in south Sichuan shale drilling. Most fish rSS happened when the operations of back reaming, pick up stands and trip-out were carried

关键词： Horizontal wells

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High temperature resistant Portland cement slurry and production method thereof

High temperature resistant Portland cement slurry and produc...

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作者： Hua Zhang Jianzhou Jin Shuoqiong Liu Fengzhong Qi Yongjin Yu Ming Xu Jinping Yuan Zhiwei ding Chongfeng Zhou Chi Zhang Zishuai Liu Yusi Feng Yuchao Guo

标准号: US11618844(B2)

The invention provides a high temperature resistant Portland cement slurry and a production method thereof. The high temperature resistant Portland cement slurry comprises the following components by weight: 100 parts of an oil well Portland cement, 60-85 parts of a high temperature reinforcing material, 68-80 parts of fresh water, 1-200 parts of a density adjuster, 0.1-1.5 parts of a suspension stabilizer, 0.8-1.5 parts of a dispersant, 3-4 parts of a fluid loss agent, 0-3 parts of a retarder and 0.2-0.8 part of a defoamer. The high temperature resistant Portland cement slurry has a good sedimentation stability at normal temperature, and develops strength rapidly at a low temperature. The compressive strength is up to 40 MPa or more at a high temperature of 350° C., and the long-term high-temperature compressive strength develops stably without degradation. Therefore, it can meet the requirements for field application in heavy oil thermal recovery wells, reaching the level of Grade G Portland cement for cementing oil and gas wells.

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