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11th International Field Exploration and development Conference, IFEdC 2021

作者： Zhou, Tuo Zhong, Zhao Chen, Chi Yang, Hui Xiao, Yue Baletabieke, Bahedaer Kong, Xiang-ji Zhou, Chuan Xiang, Ying Gao, Qing-yun Tian, Yajie CNPC Engineering Technology R&D Company Limited Beijing China Exploration Division PetroChina Southwest Oil and Gasfield Company Chengdu China China Petroleum Technical Service Corporation Limited Beijing China China National Oil and Gas Exploration and Development Company Ltd. Beijing China Research Institute of Petroleum Exploration and Development Beijing China

ISBN: (纸本)9789811921483

Tight oil has become a new growth point for global oil and gas reserves and production. Conventional tight oil reservoirs are mainly developed in depletion mode, and water flooding cannot effectively supplement formation energy. CO2 has strong advantages in terms of elasticity, mutual solubility with crude oil, etc., and is considered to be an effective way to supplement energy. At present, staged fracturing of horizontal wells has gradually become the main development method for tight oil reservoirs, but it still fails to meet production requirements. In this paper, taking the Chang 8 tight oil reservoir in the Ordos Basin as an example, it is the first time to use a combination of physical simulation and numerical simulation, and use an original large-scale physical simulation experiment system to focus on the impact of fractures on the CO2 huff-n-puff effect of staged fractured horizontal wells in tight oil reservoirs. Through the original large-scale physical simulation experiment system (which can simulate a 50 * 50 * 6 cm core), using a combination of physical simulation and numerical simulation to analyze the impact of fractures on the CO2 huff-n-puff effect of horizontal wells with staged fracturing. Studies have shown that fracture length and fracture density are the main controlling factors that affect the CO2 huff-n-puff effect of staged fracturing horizontal wells, and reasonable fracture parameters are the key to improving development efficiency. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Fracture

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design Method for Planner Coils under Magnetic Shielding Cylinder

Design Method for Planner Coils under Magnetic Shielding Cyl...

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Youth Academic Annual Conference of Chinese Association of Automation (YAC)

作者： Zhihong Wu Zhuo Wang Xia Xie Haoying Pang Wenfeng Fan Hongyu Pei School of Instrumentation and Optoelectronic Engineering Beihang University Beijing China CNPC Engineering Technology R & D Company Limited Beijing China

A novel strategy using the target field method (TFM) to design uniform and gradient magnetic field coils is proposed thereby addressing the coupling effect of magnetic field coils with high permeability materials. By combining the mirror method and Green’s function to solve the coupling effect between the magnetic field generated by the coil of the cylindrical structure and the externally enclosed high permeability material, the magnetic field generated on the inner surface of the magnetic shield and on the boundary of the magnetic field coil is finally calculated accurately. Compared with the design method that does not consider the magnetic field coupling effect, the field deviation is reduced from 3.3 × 10 −1 to 3.9 × 10 −2 (B x coil), and 9.0×10 −2 to 1.20×10 −2 (B z coil), the maximum |δ 2 | were reduced from 1.30 × 10 −1 to 4.0 × 10 −2 (dB x /dz coil), and 2.0 × 10 −2 to 1.5 × 10 −2 (dB z /dz coil). The proposed design strategy is validated by simulation analysis, and the research methodology of this strategy can be further applied to the development of core apparatus for magnetic field regulation and compensation of atomic sensors.

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A real-Time Friction Prediction Model for in Service drill String Based on Machine Learning Methods Coupling with Mechanical Mechanism Analysis

A Real-Time Friction Prediction Model for in Service Drill S...

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2021 SPE Middle East Oil and Gas Show and Conference, MEOS 2021

作者： Guo, Huijuan Luo, Huaidong Zhan, Guodong Wang, Baodong Zhu, Shuo CNPC Engineering Technology R&D Company Limited CNPC Interational Chad Co. Ltd EXPEC Advanced Research Center Saudi Arabia China University of Petroleum-Beijing China

ISBN: (纸本)9781613997727

With highly deviated wells and horizontal wells are widely used in the oil industry. The large slope well sections and long horizontal well sections will lead to a sharp increase of the drill string torque and friction, which may reduce the drilling efficiency, and even lead to accidents. Therefore, real-time and accurate analysis of drill string's torque and friction is an urgent problem facing by the modern drilling technology. The paper established a real-time friction prediction model that combines machine learning methods with drill string mechanical mechanism analysis model. Based on 84000 sets of field monitoring data obtained on-site, a regular data training set for weight on bit (WOB) and torque prediction was constructed with 23 types of time-series related parameters and 10 types of timing independent parameters. relationships between time-series related parameters and timing independent parameters with the weight on bit and torque were trained to utilize long and short-term memory (LSTM) neural network and muti-layer back propagation (BP) network respectively. The new developed LSTM-BP neural network achieves high-precision prediction results of WOB and torque with a relative error of less than 14%. Based on derived WOB and torque prediction results, a theoretical mechanical analysis model of the entire drill string was adopted in this paper to develop the quantitative relation between WOB and torque with the friction coefficient of the drill string and oil casing. Suitable friction coefficients along the drill string can be finally obtained by solving the equilibrium function between predicted WOB, torque and measured hook load, rotary-table torque via an iteration algorithm. A case study was performed finally using the proposed intelligent analysis method to calculate the friction coefficients. This proposed methodology can be referenced to decrease the sticking risks and improve the drilling efficiency, which can finally increase the extension limit o

关键词： Friction

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Simulation of rock-Breaking Ability of Polycrystalline diamond Compact Cutter Based on rock Mechanics Experiment After Heat Treatment

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Journal of Energy resources technology, Part B: Subsurface Energy and Carbon Capture 2025年第2期1卷 021007页

作者： Yin, Qishuai Wen, Zhiliang ren, Laiao Qu, Ximo Li, Qianyu Zhou, Bo MOE Key Laboratory of Petroleum Engineering China University of Petroleum Beijing 102249 China China Oilfield Services Limited Tianjin 300451 China https://***/041qf4r12China University of Petroleum Beijing MOE Key Laboratory of Petroleum Engineering China University of Petroleum Beijing 102249 China CNPC Engineering Technology R&D Company Limited Beijing 102206 China

When drilling in geothermal and deep formations, the rock-breaking mechanism of high-temperature formations is not clear. In this work, mechanical tests of rocks subjected to high temperatures were carried out, and rock-breaking models of bottom hole thermal stress dispersion and polycrystalline diamond compact (PdC) cutter were established. Aiming at efficient rock breaking pursued by drilling in high-temperature formation, rock-breaking simulations of PdC cutters with different front rake angles under the condition of temperature and confining pressure changes were carried out based on critical penetration depth. The mechanism of rock breaking is analyzed from the point of view of stress variation in the process of brittle rock breaking. The study shows that rock plasticity is enhanced after high temperature, and the temperature difference between the drilling fluid and bottom hole will make the outer part of the bottom hole shrink obviously. Under the conditions of this study, the optimal rock-breaking angle of the PdC cutter is 20 deg. The confining pressure of deep high-temperature formation will hinder rock breaking at a lower value range, and rocks under high confining pressure are more prone to brittle fracture. The increase of rotational speed has an obvious promotion stage for efficient rock breaking, and too large rotational speed will result in low brittle rock-breaking efficiency. These works are helpful in understanding the efficient brittle rock-breaking mechanism in high-temperature drilling, and can provide references for tooth design and rotational speed optimization of PdC bits.

关键词： critical cutting depth high-temperature drilling parameter optimization numerical simulation geothermal energy petroleum wells-drilling/production/construction geomechanics

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A Novel Method to determine the drilling Fluid density for Gypsum-Salt Layer

A Novel Method to Determine the Drilling Fluid Density for G...

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2021 Abu dhabi International Petroleum Exhibition and Conference, AdIP 2021

作者： Liu, Jitong Li, Wanjun Zhou, Haiqiu Gu, Yixin Jiang, Fuhua Zhang, Guobin Zhou, Shiying Liu, Haixiao Liao, Chao Wang, Shengqiang Zhou, Zhifeng CNPC Engineering Technology R&D Company Limited China National Offshore Oil Corporation China Xibu Drilling Directional Well Co. Ltd

ISBN: (纸本)9781613998342

The reservoir underneath the salt bed usually has high formation pressure and large production rate. However, downhole complexities such as wellbore shrinkage, stuck pipe, casing deformation and brine crystallization prone to occur in the drilling and completion of the salt bed. The drilling safety is affected and may lead to the failure of drilling to the target reservoir. The drilling fluid density is the key factor to maintain the salt bed's wellbore stability. The in-situ stress of the composite salt bed (gypsum-salt -gypsum-salt-gypsum) is usually uneven distributed. Creep deformation and wellbore shrinkage affect each other within layers. The wellbore stability is difficult to maintain. limited theorical reference existed for drilling fluid density selection to mitigate the borehole shrinkage in the composite gypsum-salt layers. This paper established a composite gypsum-salt model based on the rock mechanism and experiments, and a safe-drilling density selection layout is formed to solve the borehole shrinkage problem. This study provides fundamental basis for drilling fluid density selection for gypsum-salt layers. The experiment results show that, with the same drilling fluid density, the borehole shrinkage rate of the minimum horizontal in-situ stress azimuth is higher than that of the maximum horizontal in-situ stress azimuth. However, the borehole shrinkage rate of the gypsum layer is higher than salt layer. The hydration expansion of the gypsum is the dominant reason for the shrinkage of the composite salt-gypsum layer. In order to mitigate the borehole diameter reduction, the drilling fluid density is determined that can lower the creep rate less than 0.001, as a result, the borehole shrinkage of salt-gypsum layer is slowed. At the same time, it is necessary to improve the salinity, filter loss and plugging ability of the drilling fluid to inhibit the creep of the soft shale formation. The research results provide technical support for the safe drilling

关键词： Boreholes

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research and application of supramolecular gel plugging agent in abnormal pressure reservoir 10

Research and application of supramolecular gel plugging agen...

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10th Global Conference on Materials Science and engineering, CMSE 2021

作者： Baletabieke, B. Gu, Y.X. Zhou, T. duan, d.X. Liu, J.T. Kong, X.J. Qian, F. Li, W.J. Zhong, Z. Xiang, Y. Jing, N. Li, J.Y. CNPC Engineering Technology R&D Company Limited Beijing102206 China China National Oil and Gas Exploration and Development Corporation Beijing100034 China

The Aktobe project is the largest oil and gas producing area of PetroChina in Central Asia. However, after years of exploitation, the pressure of the reservoir has dropped, making it difficult to increase the production of a single well. Both the Kenkyak block and North Troyes block of the project have induced fractured leakage, and frequent leakage affects safe and efficient drilling and completion operations and production. Therefore, the research on leakage prevention and control technology is very necessary. This article focuses on the characteristics of the cracks in the high-pressure area of the Kenkyak block and the cracks in the low-pressure area of the North Troyes block. Aiming at the fracture characteristics of the high-pressure zone in the Kenkyak block and the low-pressure zone in North Troyes block, and taking advantage of the synergistic effect of supramolecules, a supramolecular plugging-while-drilling agent was developed based on the deformable fiber composite gel. It forms a strong adhesion plugging layer on the inner wall of the leakage channel through the strong adhesion force, and it achieves a good plugging effect. The 300-500md sand disc bearing pressure could reach 700psi when adding 3% agent, and the bearing pressure of 3-5d permeability sand disc could reach above 450psi. A supramolecular static plugging agent was also developed based on the dilatant gel. It is rich in strong shear reversible gel with supramolecular structure, which guarantees its pumpability and plugging performance. The effective rate of one-time plugging is over 80%, and the viscosity is greatly reduced after the gel is broken for 72hr, which benefits the reservoir protection. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Adhesion

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research on Network Application of Intelligent Campus Based on SdN technology

Research on Network Application of Intelligent Campus Based ...

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Image Processing and Computer Applications (ICIPCA), IEEE International Conference on

作者： Yunyi Mei Qi Shao Qingzhong Gao Tong Zhao Yanlong Zhang Lingzhi Jing Yang Yu CNPC Engineering Technology R&D Company Limited Beijing China National Engineering Research Center of Oil & Gas Drilling and Completion Technology Beijing China Kunlun Digital Technology Co. Ltd. Beijing China CNPC Great Wall Drilling Company Beijing China

There are some problems in traditional network architecture, such as traffic can not be real-time scheduling, business information can not be visualized, operation and maintenance is complex, and fault location efficiency is low. In order to meet the needs of “digital Petroleum” network infrastructure construction, a company introduced SdN technology into the campus office network, and carried out network optimization management and innovation practice, this paper puts forward a network transformation scheme based on SdN “The network follows the people”, through deploying SdN control server and adjusting the network equipment configuration, the office network can be expanded flexibly and maintained efficiently, to meet the needs of different types of application traffic classification management and intelligent precision scheduling, effectively improve the level of intelligent network management.

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Injectivity decline Under Langmuirian Pore Blocking: Analytical Model and Field Cases

SSRN

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SSrN 2023年

作者： Liu, Huifeng Osipov, Yuri Yuan, Zebo Chen, Zhangxin Liu, Qi Liu, Bingshan CNPC R&D（DIFC）Company Limited Dubai United Arab Emirates Moscow State University of Civil Engineering Moscow Russia PetroChina Tarim Oilfield Company Xinjiang Korla China Department of Chemical and Petroleum Engineering University of Calgary CalgaryAB Canada CNPC Engineering Technology Research and Development Company Limited Beijing China

The well injectivity decline during waterflooding is a widespread phenomenon. The reason is that injected particles retain in pores and block flow channels in near-wellbore regions, yielding permeability decline. A predictive model for this phenomenon is useful for technology development of damage prevention, mitigation or removal. Previous works assume constant filtration coefficient while long-time accumulation of captured particles can cause significant variation of filtration coefficient, strongly affecting the permeability and injectivity decline. In this paper, an analytical model for radial suspension transport in porous media is based on the Langmuirian blocking filtration function, where the particle capture probability linearly depends on the retained concentration. The solution is obtained as an asymptotic expansion using the dimensionless distance from wellbore as a small parameter. The exact expression of retained particle concentration at the concentration front is also obtained. For comparison, numerical solutions are also obtained by Shampine’s code, which is based on the explicit central finite deference method. Comparisons between the analytical and numerical solutions of retained particle concentration show that their difference errors do not exceed 5% in waterflooding conditions. Based on the analytical solution of retained particle concentration, expressions of injection pressure, skin factor and damaged zone radius are also derived. True water injection and damage removal treatment data from Tarim Oilfield, western China, is used to test the analytical solutions of damaged zone radius. It shows that the calculated results are basically consistent with the actual situation. The analytical expressions in this paper can be used for predicting the damage extent of an injector and quantitatively optimizing an acidizing job by estimating the required acid volume to remove the damage. © 2023, The Authors. All rights reserved.

关键词： Analytical models

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Wide and deep Cross Network for the rate of Penetration Prediction

SSRN

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SSrN 2023年

作者： Pei, Zhijun Song, Xianzhi Ji, Yong Yin, Tianshi Tian, Shouceng Li, Gensheng Beijing102249 China State Key Laboratory of Petroleum Resources and Prospecting Beijing102249 China CNPC Engineering Technology R&D Company Limited Beijing102206 China

rate of penetration (rOP) prediction is of great significance for drilling optimization. However, the current intelligent rOP prediction models are mostly based on complete data-driven, and the mobility and stability of the model need to be improved. Based on the analysis of the modified Young's rOP equation, there are linear, nonlinear, and cross-multiplication relationships between rOP and multiple drilling parameters. Therefore, the deep neural network (dNN) model, known for its strong nonlinear fitting ability, is difficult to fully mine the hidden information of drilling data. Based on the wide and deep learning (WdL)model and deep and cross neural network (dCN) model, an innovative wide and deep cross neural network (WdCN) was proposed in this research to fit the complex correlation between multiple drilling parameters and rOP. Using the drilling data of two ultra-deep wells in Tarim Oilfield, the intelligent rOP prediction models of dNN, WdL, dCN, and WdCN were established, and four cases were established to evaluate the fitting ability and migration ability of the models. The results show that the mean relative error (MrE) of the WdCN rOP prediction model in adjacent wells is the lowest at 11.36%, and the maximum increase is 7% compared to the dNN model, showing a high fitting ability and migration ability. © 2023, The Authors. All rights reserved.

关键词： Neural network models

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Case study: In-situ stress characteristics and fracture zone activation analysis of Changning shale gas in Sichuan Basin 55

Case study: In-situ stress characteristics and fracture zone...

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

作者： Zhaowei, Chen Hu, Cao Yuanhui, Shi Jianhui, dong CNPC Engineering Technology R&D Company Limited Beijing China Beijing China Sinopec Jianghan Petroleum Engineering Co. Ltd Hubei Qianjiang China CNPC Emergency coordination office Beijing China

ISBN: (纸本)9781713839125

In the Changning Shale Gas development blocks in Sichuan Basin, casing deformation seriously restricted the efficient development of shale gas. Based on stress quadrilateral principle, the in-situ stress model of Changning area is established. The seismic and microseismic data were used to analyze the characteristics of fracture zone. Based on the principle of critical stress fault, the mechanical activity of fracture zone was analyzed. Finally, the in-situ stress characteristics, fracture zone development and fracture zone activity of Fuling block and Barnett block were discussed. The results showed that Changing area is in the reverse strike slip stress mode, and the difference between the shear stress and the sliding resistance on the fracture zone with high dip angle is the minimum, which is the internal reason why the fracture zone is easy to be activated. The sliding resistance on the fracture zone is greatly reduced by fracturing operation, which is the external reason for the fracture zone sliding induced by fracturing. This result states the geomechanical reasons of casing deformation in Changning area, which provides theoretical significance to solve the problem of casing deformation in Changning area. Copyright © 2021 ArMA, American rock Mechanics Association.

关键词： deformation

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