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Innovation of Tubing Conveyed Perforating technology in the Agadem Field, Niger 12th

Innovation of Tubing Conveyed Perforating Technology in the ...

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12th International Field Exploration and development Conference, IFEdC 2022

作者： Liu, Qi Li, Wan-Jun Liu, Hui-Feng Wang, Gang Xiao, Yue Engineering Technology R&D Company Limited CNPC Beijing102206 China

ISBN: (纸本)9789819919635

Tubing conveyed perforating technology is the main perforating method used in oil fields because of its unique advantages. For sandstone reservoirs development, the reservoirs alternate with sandstone and mudstone. There are often multiple perforated intervals with mudstone interlayers, ranging from 1-2 m to hundreds of meters, which is not required perforation. For shorter interlayer, usually use space gun to avoid the mudstone layer and transfer detonation wave. Niger is a major oil and gas producer in West Africa. The Agadem, Bilma and Tenere blocks are being explored and developed, and the Agadem field is the largest one among them. According to the logging data, the average oil layer thickness of each well drilled in Agadem is 18-20 m, and the average single oil layer thickness is 2-3 m. It presents typical interbedded form of sand and mudstone. The perforation operations are faced with the problems of multiple layers and large span. For the mudstone interlayer with a span of 10m or more, the sealing reliability of the sealing parts of the space gun is very high, as well as the connection of the detonating cable between the guns and the reliability of the detonating tube. The large span often leads to the failure of detonating cable, and the perforating pipe string of the space gun cannot solve this problem well. It can only run perforating string many times in hole to shoot different zones in one well, which not only increases the operation cost, but also reduces the operation efficiency. In order to solve the above problems, a new type of perforation joint was designed. The joint contained a perforating gun rack, which is used for fastening the joint of the upper perforating gun and the perforating joint. The technical effect is to reduce the tension of the string during running. There are two sealing ring grooving on the tubing transmission perforating multi-stage joint, and the sealing ring is installed before entering the well. The technical effect is to e

关键词： Cost reduction

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AdLM-LWd: Adaptive deep Learning Model for Lithology Identification from Logging- While-drilling data with Online Learning Mechanism

ADLM-LWD: Adaptive Deep Learning Model for Lithology Identif...

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2024 International Conference on New Trends in Computational Intelligence, NTCI 2024

作者： Zhao, Ziyun Lin, Wang Jing, Lingzhi Tian, Yumeng Guo, Weihong CNPC Engineering and Technology R&D Company Limited Beijing102206 China

ISBN: (纸本)9798331517021

Accurate lithology identification from Logging-While-drilling (LWd) data is crucial for optimizing drilling operations and enhancing reservoir characterization in the oil and gas industry. However, the lack of standardized datasets and the need for real-time adaptability in varying geological environments pose significant challenges. This study addresses these issues through three key contributions. First, a comprehensive dataset for lithology identification is constructed, combining LWd features with corresponding lithology labels, providing a valuable resource for deep learning applications in this field. Second, a novel deep learning model is proposed, integrating 2d convolution and bidirectional LSTM to effectively capture both spatial and temporal features of LWd data. The model demonstrates high stability and performance across various metrics in extensive cross-validation tests. Lastly, an Adaptive Incremental Learning Algorithm (AILA) is introduced, incorporating online learning mechanisms and dynamic adaptation strategies to enhance the model's real-time adaptability. These advancements contribute to more accurate and adaptive lithology identification systems, which potentially improve real-time decision-making in drilling operations and lead to more efficient and cost-effective exploration and production processes. © 2024 IEEE.

关键词： Gas industry

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Prediction of Horizontal and Vertical distribution Trend of Formation Pressure and Characteristics of Safety density Window in Yinggehai Basin 29th

Prediction of Horizontal and Vertical Distribution Trend of ...

引用

29th International Conference on Computational and Experimental engineering and Sciences, ICCES 2023

作者： Gao, reyu Cui, Yi Fan, Jinzhao Yang, Guang Yang, Hongwei CNPC Engineering Technology R&D Company Limited Beijing102206 China

ISBN: (纸本)9783031429866

The formation pressure system of Yinggehai Basin has the characteristics of poor horizontal distribution regularity and severe vertical distribution changes. This paper proposes a new method for predicting the horizontal and vertical distribution trend of formation pressure for the situation of limited offshore drilling data. The method is based on the topological triangulation algorithm, combined with the data set to fit the multivariate interpolation function, and conveniently realizes the prediction and visualization of the three-dimensional horizontal and vertical distribution trend of regional formation pressure. On this basis, through the analysis of the relevant data of the complex accident points that have been drilled, the characteristics of the single well safety density window and the regional safety density window are clarified. The study found that there is no high pressure in the shallow layer of the block, and the formation pressure spreads smoothly in the lateral direction;the high pressure top surface is at 3500 m, and the formation pressure gradually increases with the increase in longitude and decrease in latitude in the lateral direction. The formation pressure rises extremely rapidly with the increase of depth in the longitudinal direction, which has the characteristic of "broken line pressurization". The safety density window of single well is in the shape of funnel with the characteristic of turning back, and the turning section is between 3500 and 4000 m. The safety density window feature of the block can be divided into three stages according to the depth, and the window appears extremely narrow after 3500 m (3). © 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Forecasting

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Clay-free biodiesel-based drilling fluid suitable for high temperature 8

Clay-free biodiesel-based drilling fluid suitable for high t...

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2022 8th International Forum on Manufacturing technology and engineering Materials, IFEMMT 2022

作者： Shi, He Ni, Xiaoxiao Zhang, Jiaqi Cheng, rongchao Yan, Lili Wang, Jianhua Liu, rentong Geng, Yuan CNPC Engineering Technology R&D Company Limited Beijing102206 China

This paper introduces the formation of a clay-free biodiesel-based drilling fluid system. The system uses the biodiesel derived from the transesterification between soybean oil and methanol as the continuous phase, which is environmentally friendly and has an appropriate flow state. In order to inhibit the hydrolysis of the base oil under high temperatures, a small amount of methanol is retained and Lime addition is minimized. Besides, the system also contains a special polyamine-typed rheological modifier instead of organoclay to provide a fragile gel-structure with lower plastic viscosity and higher yield point, thus good for hole cleaning and solid suspension while keeping a higher rate of penetration (rOP). In order to strengthen the plugging and fluid loss control abilities, superfine calcium carbonate and oxidized asphalt are added and obtain a good outcome. Evaluation results showed that the clay-free biodiesel-based drilling fluid exhibits good properties of rheology, filtration, and emulsion stability, with temperature resistance over 200°C, which is suitable for the exploration of unconventional oil/gas restores. © Published under licence by IOP Publishing Ltd.

关键词： Lime

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Collision Mechanism of Marine drilling riser and Internal String in deep-water drilling 34th

Collision Mechanism of Marine Drilling Riser and Internal St...

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34th International Ocean and Polar engineering Conference, ISOPE 2024

作者： Zhang, Minghe Cui, Longlian Wang, Haige Yang, Jin Yang, Guobin Zhang, Guobin Liu, Qi Kong, Lulin Sun, Ke Jia, Wanting CNPC Engineering Technology R&D Company Limited China Beijing China

ISBN: (纸本)9781880653784

due to the complex marine environment loads, large horizontal deflection of marine risers, and contact and collision between risers and internal pipe strings will occur during drilling string installation and drilling process, resulting in drilling string wear and deformation, which brings great challenges to deep-water drilling. Based on the pipe-in-pipe model, the static analysis model of the whole process of contact and collision between riser and internal drilling string is established, and the contact modes of riser and internal drilling string are classified. The sensitivity analysis of key mechanical parameters, such as water depth, platform offset, environmental loads, and riser top tension was also carried out. The numerical simulation method is used to show the contact and collision between risers and internal pipe strings, and the control method for risers and internal string collision under different water depth conditions is proposed. © 2024 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Marine risers

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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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An intelligent artificial lift technology and its trial in middle east: Integration of remote wireless control and artificial automation for zonal water injection

An intelligent artificial lift technology and its trial in m...

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SPE Annual Technical Conference and Exhibition 2020, ATCE 2020

作者： Fu, Jin Wang, Xi Yang, Guobin Zhang, Shunyuan Liu, Bingshan Chen, Chen CNPC Engineering Technologies R&D Company Ltd

ISBN: (纸本)9781613997239

High water cut is a serious problem for mature oilfields in China. Water injection paths are intersected with each other, injectors and producers are distributed in a more and more complicated pattern, while low-productivity layers are more focused. Conventional zonal water injection technologies require repetitive operation with wirelines and cables, causing extensive tests and low efficiency. However, an intelligent zonal water injection string consisting of several preset cable packers, water injection pressure gauges, formation pressure gauges and downhole flow meters has simply optimized water injection parameters and efficiently developed all reservoirs in some China's mature oilfields. Horizontal drilling and extended reach well drilling technologies are developing by high speed, we are faced by more critical borehole conditions, which has brought more challenges to water adsorption testing of horizontal intervals and deployment of zonal water injection instruments. Compared with vertical wells, the water adsorption test and string running are more challenging for horizontal wells, in which we are faced by many a problem during zonal water injection, such as competitive slack off and tight pull, excessive or inadequate water injection, complicated operation process, etc. There are several common challenges arising from zonal water injection, such as tight pull, slack off and repetitive operation. A full set of wireless intelligent water injection string for horizontal wells has been proposed. Based on pressure pulse water distribution technique, the water injection string is eligible for multi-stage adjustment, so it is possible to finalize testing, adjusting, injection, measurement, downhole data collection as well as automatic error correction in one run during water injection. A dedicated trial shows that integration of remote wireless control and artificial automation may is applicable, as packers are set securely and released easily, in order to adjust o

关键词： data acquisition

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Predicting seismic-based anisotropy for prevent pre-drill risk using a novel type neural network

Predicting seismic-based anisotropy for prevent pre-drill ri...

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SPE/IATMI Asia Pacific Oil and Gas Conference and Exhibition 2021, APOG 2021

作者： ding, Yan Cui, Meng Wang, Hai Ge Fei, Zhao Shi, Xiao Yan Huang, Kai CNPC Engineering Technology R&D Company Limited Beijing102206 China

ISBN: (纸本)9781613997833

While drilling into fracture zones, lost circulation frequently occurs, resulting in a waste of productive operation severe cases, the well's destruction. However, due to complex development mechanisms and high heterogeneity, identifying and predicting fractures is extremely difficult. This study proposes a new drilling loss prevention idea to evaluate fractured lost circulation risk using seismic and wellbore data by a novel neural network. The approach works in two steps. First, the fracture anisotropy of a lost circulation sample curve is computed and interpreted using well logs. Second, using seismic attributes as constraints, a novel neural network is used to develop a prediction model. The field application in the Sichuan basin verifies the method's efficacy and confirms the method's ability for predicting lost circulation probability both along the well trajectory and in regions away from the drilled wells. © 2021, Society of Petroleum Engineers.

关键词： Anisotropy

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Application of Integrated directional and Guide drilling technology in deep Coalbed Methane 7

Application of Integrated Directional and Guide Drilling Tec...

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7th International Conference on downhole Measurement and Control, ICdMC 2024

作者： Zhu, Weixing Wang, Zhuang Wu, dong Lin, Wang Wang, Yaxuan Huang, Kai He, Jiayu Xue, Hongzhi CNPC Engineering Technology R&D Company Limited Beijing102206 China

deep coalbed methane is characterized by deep burial, complex and diverse microstructures, significant lateral variations in reservoirs, and the development of internal interlayers. Current seismic exploration methods suffer from severe high-frequency signal attenuation in coal layers, resulting in low seismic resolution, which severely limits the precision of geological models for coalbed methane and the encounter rate of reservoirs in horizontal wells. Based on this, this paper introduces an integrated directional and guide drilling technology and applies it to horizontal well operation, achieving excellent results. Firstly, in the pre-drilling phase, we utilize well-seismic integrated reservoir and structural prediction techniques to meticulously characterize coal seam distribution patterns and subtle geological structures. This enables the construction of a geo-steering model specifically for horizontal wells, optimizing the locations of target points, designing well trajectories, and selecting the optimal configuration of geological steering tools. Secondly, in the drilling operation stage, this system iteratively refines the depth-domain seismic section based on real-time measure while drilling (for short MWd). This process reconstructs the geological steering model, precisely predicts the position of coal seams at the bottom of the well, continuously optimizes the well trajectory design in real-time, and ultimately generates geo-steering instructions. Finally, after the completion of drilling operations, the system evaluates the coal seam area and iteratively refines the three-dimensional geological model. This process provides technical support for the deployment of the next well and the design of the target trajectory. After verification through multiple horizontal wells targeting deep coalbed methane, the guiding model reconstructed by this technology has achieved a fitting rate of over 95%, significantly enhancing the reservoir encounter rate to above 90%

关键词： Horizontal wells

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A Fast Calculation Method for Natural Fractures Activation Considering Stress Shadow and Study on the Law of Natural Fractures Activation State Changes

A Fast Calculation Method for Natural Fractures Activation C...

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2021 Abu dhabi International Petroleum Exhibition and Conference, AdIP 2021

作者： Qiao, Yan Zhang, Yang Jiang, Tianhong Zhang, Guobin Chen, Qing Shang, Litao Hou, Tengfei CNPC Engineering Technology R&D Company Limited PetroChina Tarim Oilfield Company China

ISBN: (纸本)9781613998342

during hydraulic fracturing process of the Permian Basin in North America, the cluster spacing has been shortened to 3m, and stress shadow can no longer be ignored. Many scholars have studied the influence of stress shadows to optimize cluster spacing. For reservoirs with natural fractures, how to activate more natural fractures through hydraulic fracturing has become the purpose. However, few scholars have studied changes in the activation law of natural fractures under stress shadow conditions. This paper establishes stress change value around single fracture according to Sneddon formula, and calculates the maximum and minimum principal stress according to plane principal stress calculation formula. Considering attenuation of net pressure, stress field of multiple fractures is established, and influence of various factors on stress re-orientation is studied. Finally, considering attenuation of net pressure with distance, according to discriminant formulas of tension & shear activation, the proportion of natural fractures that are easily activated is calculated. By designing orthogonal experiments, the influence of different factors on the proportion of activated natural fractures was studied. The stress increase in the direction of the minimum principal stress is much greater than the increase in the direction of the maximum principal stress. The stress increases in the direction of the maximum principal stress at the tip of the hydraulic fracture. The tip position between hydraulic fractures is "neutralized" due to the superposition of shear stress. Stress-fracture angle and the in-situ stress difference are the common main influencing factors for both tensile and shear activation, but the net pressure has little effect on the tensile activation of natural fracture. The fracture spacing has little effect on the activation of natural fractures. When formulating the fracturing scheme, we should pay more attention to the net pressure rather than the fracture spacing

关键词： Chemical activation

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