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57th US rock Mechanics/Geomechanics Symposium

作者： Pan, Tao Song, Xianzhi Wang, Zheng Yin, Zhiyong Ji, Yong Zhu, Lin Pei, Zhijun Ye, Shanlin Liu, Muchen Li, Zhen Zhu, Zhaopeng Beijing102249 China CNPC Engineering Technology R&D Company Limited Beijing102206 China

ISBN: (纸本)9780979497582

At present, with the continuous development of unconventional oil and gas exploration and development, horizontal wells, as an important means of unconventional oil and gas exploitation, have attracted much attention from drilling teams and oil field companies. However, the cost of horizontal well drilling is relatively high, so more targeted construction should be carried out according to the characteristics of horizontal well drilling. Therefore, rate of penetration (rOP) prediction of horizontal wells is extremely important. The current rOP prediction models of horizontal wells mainly rely on manual experience and some mechanism models, and do not take field data and actual construction conditions into account, so the field application effect is difficult to be ideal. To solve this problem, an intelligent algorithm based rOP prediction model for horizontal Wells is proposed and a novel dual-input neural network structure is designed. Sequential data such as hook load and rotary torque are input into Gated recurrent unit' (GrU) network, and non-sequential data such as bit type are input into back-propagation neural network(BP), which is called dual Input GrU(di-GrU) rOP prediction model. The results show that mean absolute percentage error and r-squared of this model are 11.8% and 0.923 respectively. The prediction model based on di-GrU proposed in this paper has higher accuracy and better mobility, which is of guiding significance for improving the drilling efficiency of horizontal wells. © 2023 57th US rock Mechanics/Geomechanics Symposium. All rights reserved.

关键词： Horizontal wells

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research of Smart Completion driven by Internet of Things and Its Application on a Highly-deviated Well

Research of Smart Completion Driven by Internet of Things an...

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2023 SPE Caspian Technical Conference and Exhibition, CTC 2023

作者： Jin, Fu Longlian, Cui Guobin, Yang Qi, Liu Chen, Chen CNPC Engineering Technology R&D Company Ltd China

ISBN: (纸本)9781959025160

The oil and gas sector industry is actively embracing the integration of remotely monitored and controlled well completions. This technological advancement, commonly known as "intelligent completions," has experienced rapid progress in recent years, showcasing advantages such as heightened recovery rates and accelerated production. Notably, cost savings derived from reduced well interventions offer additional returns, particularly for wells characterized by multilateral configurations, subsea locations, or unmanned platform setups. The adoption of this technology continues to gain momentum due to the proven value demonstrated through field installations. The implementation of intelligent completions has become pervasive, with around 3000 systems deployed by the conclusion of 2022. With the rapid development of the economy and society, as well as the continuous deepening of oilfield development, the traditional on-site management model of oilfield personnel for oil-water wells has increased the labor costs for enterprises. In response to this, by means of a digital intelligent water injection monitoring system driven by Internet of Things (IoT), oilfield managers can monitor and control water injection equipment anytime and anywhere, realizing convenient management. The remote wireless intelligent water injection device mainly consists of an underground intelligent water distributor, a surface control unit, and a remote-control system, constituting a wireless visualized production control system. This system, through real-time monitoring of individual well water injection status and coordination with water injection and production data across the entire block, conducts big data analysis to effectively enhance reservoir development efficiency. The intelligent water distributor is equipped with pressure sensors, temperature sensors, and flow meters, enabling the monitoring of subsurface pressure, temperature, and related data. The surface control unit acts as the centr

关键词： Production control

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Experimental Study on Hydraulic Fracture Propagation Mechanism of Water Injection Propagation in Super deep Fracture-Cavity Carbonate reservoir 13th

Experimental Study on Hydraulic Fracture Propagation Mechani...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Sun, Xun Liu, Jiangyu Jin, Yi ren, dengfeng Zhang, Yang Shang, Litao Bai, Haoli Wu, Xi CNPC Engineering Technology R&D Company Limited Beijing China PetroChina Tarim Oilfield Company Korla China

ISBN: (纸本)9789819702596

The super deep fracture-cavity carbonate reservoir in Tarim Basin has copious amounts of oil and gas, in which karst cave is the main reservoir space. It is necessary to communicate with karst cave through hydraulic fractures to realize efficient development due to the deep burial, poor physical properties, random distribution of natural fractures and caves, complex location relationship between wells and caves. Therefore, it is of great significance to study the hydraulic fracture propagation mechanism in fracture-cavity carbonate reservoir. In this research, a novel laboratory simulation method for water injection propagation was established based on true tri-axial hydraulic fracturing equipment. Using this method, the law of fracture connecting cave under different experimental conditions were analyzed, and the relationships between water injection volume and cave volume were clarified. The results show that: low stress difference, small included angle (between cave and horizontal maximum stress) and the use of temporary plugging agent have huge contribution to improve the number of caves that connected with hydraulic fractures;the critical turning condition of hydraulic fracture is sensitive to factors such as the position relationship of well and cave, horizontal stress difference and included angle. This study has certain theoretical guiding significance for fracturing design and water injection parameter optimization in fracture-cavity carbonate reservoir. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Fracture

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Crude oil wax:A review on formation,experimentation,prediction,and remediation techniques

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Petroleum Science 2022年第5期19卷 2343-2357页

作者： Wyclif Kiyingi Ji-Xiang Guo rui-Ying Xiong Li Su Xiao-Hui Yang Shi-Ling Zhang Unconventional Petroleum Research Institute China University of PetroleumBeijing102249China Sinopec Northwest Oil Field Branch UrumqiXinjiang830011China CNPC Engineering Technology R&D Company Limited BeijingChina

Wax deposition during crude oil production,transportation,and processing has been a headache since the early days of oil *** may lead to low mobility ratios,blockage of production tubing/pipelines as well as fouling of surface and processing facilities,among *** snags cause massive financial constraints increasing projects’*** of meticulous research have been dedicated to this problem that is worth a ***,this paper reviews the mechanisms,experimentation,thermodynamic and kinetic modeling,prediction,and remediation techniques of wax *** overall assessment suggests that available models are more accurate for single than multi-phase flows while the kind of remediation and deployment depend on the environment and severity *** severe cases,both chemical and mechanical are synergistically ***,future prospective research areas that require attention are ***,this review could be a valuable tool for novice researchers as well as a foundation for further research on this topic.

关键词： Oil wax Phase modeling Inhibitors dispersants Multi-phase flow

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Numerical analysis of the hydraulic fracture communication modes in fracture-cavity reservoirs

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Petroleum Science 2022年第5期19卷 2227-2239页

作者： Jia-Wei Kao Shi-Ming Wei Wen-Zhi Wang Yan Jin State Key Laboratory Petroleum Resources and Prospecting China University of PetroleumBeijing102249China Sinopec Research Institute of Petroleum Engineering Beijing102206China CNPC Engineering Technology R&D Company Limited Beijing102206China

The fracture-cavity carbonate reservoirs in the Tahe Oilfield in China are mainly exploited by *** need the hydraulic fractures to communicate with caves to create a flow ***,due to the existence of the fracture-cavity systems,the hydraulic fracture propagation morphology is complicated,while the propagation characteristics are not *** analyze the hydraulic fracture propagation in fracture-cavity carbonate formations,based on the discontinuous discrete fracture model,we developed a solid-seepage-freeflow coupled fracturing model for fracture-cavity formations,which can simulate the complex interaction behavior of fractures and *** on the simulation results,we found the interaction rule between hydraulic fractures and fracture-cavity systems:the stress concentration around caves is the main factor that determines the fracture propagation *** due to stress concentration is usually not conducive to communication,while natural fractures distributed around caves could break the rejection *** the hydraulic energy in the hydraulic fracture can make fracture propagate directly and reduce the influence of *** steering fracture formed by temporary plugging is beneficial to the communication of fracture-cavity systems in the non-principal stress *** to the simulation results of different fracture-cavity characteristics,we raised four optimization communication modes for fracture-cavity carbonate formation to provide references for fracturing optimization design and parameter optimization.

关键词： Fracture-cavity carbonate formation Hydraulic fracture propagation Numerical simulation Fracture-cave communication discontinuous discrete fracture model

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Plugging performance and mechanism of an oil-absorbing gel for lost circulation control while drilling in fractured formations

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Petroleum Science 2022年第6期19卷 2941-2958页

作者： Ying-rui Bai Li-Yao dai Jin-Sheng Sun Guan-Cheng Jiang Kai-He Lv rong-Chao Cheng Xiao-Sen Shang School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongChina CNPC Engineering Technology R&D Company Limited Beijing102206China College of Petroleum Engineering China University of Petroleum(Beijing)Beijing102249China

Lost circulation of drilling fluid is one of the most common engineering problems in the drilling process of fractured *** this study,an oil-absorbing polymer gel synthesized using compound monomers with rigid and flexible chains was applied to control the oil-based drilling fluid loss while *** microstructure,oil-absorbing performance,and plugging performance the gel was investigated.A large number of dense pores on the surface of the gel were observed,which allowed the oil molecules to enter the internal space of the *** initial oil absorption capacity of the gel was fast,and it increased with the increase in the temperature and decrease in the particle size,reaching 20.93 g/g at140℃.At a high temperature of 140℃,the bearing pressure capacity of the gel formula containing particles of different particle sizes reached 7.6 MPa for a fracture of a width of 3 mm,showing that the oil-absorbing gel have excellent plugging performance at high *** mechanism of the gel was investigated through visualized fracture plugging *** show that the dynamic migratio n,particle-swelling,particle-bridging,particle-aggregation,deformation-filling,and compaction-plugging contribute to the whole lost circulation control process,reflecting that the plugging performance can be effectively enhanced by improving the aggregation and filling degrees of the gel with different particle sizes.

关键词： Lost circulation Oil-absorbing gel Oil absorption capacity Plugging mechanism Fractured formation

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New Understanding of Temperature Change rules of Horizontal Sections of different Well Body Structures and the relationship Between Production Capacity and Stimulation Parameters Based on das/dts

New Understanding of Temperature Change Rules of Horizontal ...

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2024 SPE Gas and Oil technology Conference, GOTECH 2024

作者： Qiao, Yan Zhang, Yang Gong, Wanxing Wu, Xi Wang, Siqi CNPC Engineering Technology R&D Company Limited Beijing China PetroChina Tuha Oilfield Company Xinjiang China

ISBN: (纸本)9781959025405

Since 2019 dAS has been widely used with horizontal well fracturing dynamic monitoring and interpretation analysis, achieving quantitative calculation of fluid and sand production in each fracturing section and cluster, however, there is a lack of in-depth understanding of the change rule of temperature, fluid production in each section and cluster and stimulation parameters under the conditions of different production regimes in horizontal wells with different well body structures. In this study, by conducting continuous tubing through fiber-optic fluid production profile tests on wells A (downslope wells) and B (upslope wells) with different well body structures and dTS/dAS data acquisition for 10mm, 6mm/5mm nozzles and shut-in production regimes, we obtained data on the temperature change and vibration change under the conditions of different production regimes. Then we interpreted and analyzed the monitoring results by applying the temperature and acoustic interpretation model to get the fluid production of each fracturing section cluster under the conditions of different production regimes. The monitoring results show that the overall temperature change of the wellbore caused by the production adjustment of 10mm/6m/5mm nozzle is small, and the temperature change caused by the adjustment of the production regime of shut-in/opening the well is large, and the whole wellbore warms up/cools down significantly. The vibration response of dAS in the area of the main production layer is obvious, and the vibration signal has obvious intensity change in the process of regime switching, and the production signal stops after shutting in the well. The toe temperature of downslope wells is higher than the heel temperature, the wellbore temperature of the heel increases after the toe produces fluids, and the larger the nozzle is, the more obvious the heel warming is;the toe temperature of upslope wells is lower than the heel temperature, the wellbore temperature of the heel de

关键词： Nozzles

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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...

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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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double network self-healing hydrogel based on hydrophobic association and ionic bond for formation plugging

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Petroleum Science 2022年第5期19卷 2150-2164页

作者： Ying-rui Bai Qi-Tao Zhang Jin-Sheng Sun Guan-Cheng Jiang Kai-He Lv School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongChina CNPC Engineering Technology R&D Company Limited Beijing102206China College of Petroleum Engineering China University of Petroleum(Beijing)Beijing102249China

Self-healing hydrogels have attracted tremendous attention in the field of oil and gas drilling and production engineering because of their excellent self-healing performance after physical *** this study,a series of double network self-healing(dN_(SA))hydrogels based on hydrophobic association and ionic bond were prepared for plugging pores and fractures in formations in oil and gas drilling and production *** mechanical,rheological,and self-healing properties of the dN_(SA)hydrogels were *** revealed that the dN_(SA)hydrogels exhibited excellent mechanical properties with a tensile stress of 0.67 MPa and toughness of 7069 kJ/cm^(3) owing to the synergistic effect of the double *** addition,the dN_(SA)hydrogels exhibited excellent compression resistance,notch insensitivity,and self-healing *** dN_(SA)-2 hydrogel was granulated and made into gel particles with different particle sizes and used as a plugging *** self-healing mechanism of dN_(SA)-2 hydrogel particles in fractures was explored,and it’s plugging effect on fractures of different widths and porous media of different permeabilities were *** results revealed that the plugging capacity of the dN_(SA)-2 hydrogel particles for a fracture with width of 5 mm and a porous medium with a permeability of 30μm^(2) was 3.45 and 4.21 MPa,respectively,which is significantly higher than those of commonly used plugging agents in the *** dN_(SA)hydrogels with excellent mechanical and self-healing properties prepared in this study will provide a new approach for applying hydrogels in oil and gas drilling and production engineering.

关键词： Self-healing hydrogel Hydrophobic association Ionic bond Mechanical property rheological property Formation plugging

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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...

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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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