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Water Shutoff and Conformance Improvement for Lamadian Oilfield in daqing Using a Novel Polymer System: Experimental Study, Simulation, and Pilot Tests

Water Shutoff and Conformance Improvement for Lamadian Oilfi...

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2023 Abu dhabi International Petroleum Exhibition and Conference, AdIP 2023

作者： Lu, Meng Singh, Harpreet Li, Jianshen Huang, Qiushi Ma, Chi Shan, Gaojun du, Qinglong Cai, Meng Wang, Haitao Liu, Xiangbin Qiao, Yan Chen, Huan Chen, Zhao Nie, Cong CNPC USA Corp HoustonTX United States CNPC Engineering Technology R&D Company Limited Beijing China PetroChina Daqing Oilfield Company Heilongjiang Daqing China

ISBN: (纸本)9781959025078

Primary recovery and extensive waterflooding lead to preferential pathway for the water between injectors and producers, resulting in low sweep efficiency and lower oil recovery. The Lamadian Oilfield in daqing has been waterflooded for 50 years, where various methods have been tried to reduce the high water-cut. This paper presents a novel water conformance control system that has been successfully applied to reduce water-cut and increase the oil production from Lamadian Oilfield. The polymer system containing swelling particles and delayed polymer gelling agents to form plugs and block high permeability channels was tested in the laboratory through sandpack and coreflood experiments at reservoir temperature using injection brine from the Lamadian Oilfield. With injection concentration of polymer ranging between 1200-4500 ppm and crosslinker between 1200-1600 ppm, the experimental tests showed formation of strong plugs in-situ with delayed time of 4-18 days. This system also had low polymer/crosslinker's retention. The lab-measured parameters for rock-fluid interaction were used as input in a history-matched numerical reservoir simulator. Several scenarios with different injection schemes were simulated to investigate the volume of plugs formed, maximum distance travelled by the gelling agents from the injectors before forming plug, and their impact on the surrounding production wells. Simulation results showed that the formation of the plug was the most robust at the front of the crosslinker-polymer system, and the region between the injectors and the front showed formation of secondary plugs by the particles. An optimal scenario was selected for pilot tests. Field tests for 2 well groups with a total of 16 wells started in december 2021 that were successfully completed by April 2022. Field test results show the targeted high-perm channels were blocked, resulting in a significant increase in oil production (up to 15%) in the majority (71%) of the surrounding produ

关键词： Control systems

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limited Entry Liner Completion and Acidizing design with Consideration of reservoir Heterogeneity for MrC Wells

Limited Entry Liner Completion and Acidizing Design with Con...

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2023 Asia Pacific Unconventional resources Symposium, APUr 2023

作者： Liu, Huifeng Jia, Wanting Cui, Longlian Xu, Ning Yang, Guobin Liqiu, Ping Chen, Zhangxin CNPC R&D DIFC Company Limited Dubai United Arab Emirates CNPC Engineering Technology R&D Company Limited Beijing China PetroChina International Investment Australia Pty Ltd Brisbane Australia Department of Chemical and Petroleum Engineering University of Calgary CalgaryAB Canada

ISBN: (纸本)9781959025146

MrC (Maximum reservoir Contact) wells with extra-long laterals (formation contact length > 5000m) are drilled in many oilfields in the world to develop tight and thin reservoirs. LEL (limited Entry Liner) completion and acidizing are an effective technology to stimulate these wells because they distribute the acid uniformly along the long laterals. The design of a distribution of holes in LEL is the key to this technology, especially for reservoirs with high heterogeneity. This study focuses on the optimization of the current LEL completion design strategy by considering the porosity heterogeneity along the lateral and the permeability anisotropy within each segment. Firstly, a model for designing a distribution of holes in LEL is established by incorporating a newly developed model for calculating a post-stimulation equivalent skin factor. Secondly, three LEL completion design strategies are proposed: uniform acid coverage, uniform wormhole length and uniform equivalent skin factor. Thirdly, a real well case is introduced to show the difference between the three strategies in terms of the distribution of holes, generated wormhole length and post-stimulation skin factor. In our new design model, the variances of formation porosity, the differences in acid outlet flow velocity among different segments and the difference in permeability in different directions are considered. This model is used in a horizontal well to achieve uniform post-stimulation equivalent skin factor and the result is compared with those by the other two design strategies. The result from the uniform acid coverage strategy shows that the total number of holes is 198, the length of the generated wormhole is 4.46ft and the equivalent skin factor is -2.88. The result from the uniform wormhole length strategy indicates that fewer holes (totally 135) and a more irregular holes distribution are obtained;the wormhole length is 0.43ft. The result from the uniform equivalent skin factor design strategy s

关键词： Porosity

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3d geomechanical model construction and application of deep shale gas in the Luzhou Block, Sichuan Basin 57

3D geomechanical model construction and application of deep ...

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57th US rock Mechanics/Geomechanics Symposium

作者： Wang, Yuan Yang, Henglin Fu, Li Chen, Gang Yuan, Guangjie Zhang, Heng Wang, Zixin CNPC Engineering Technology R&D Company Limited Beijing China National Engineering Research Center of Oil & Gas Drilling and Completion Technology Beijing China

ISBN: (纸本)9780979497582

deep shale gas with a burial depth of 3500-5000m became an important area for shale gas development in China. The characteristics of the rock's mechanics and the in situ stress have a significant impact on the drilling and fracturing effects of horizontal wells. Finite element simulation is used to build an accurate in situ stress model from the data of acoustic logging, diagnostic fracturing injection test, FMI imaging logging, and stress measurement. The results show that Young's modulus and Poisson's ratio in the Luzhou block change vertically with the deposition time. The Longmaxi reservoir has an abnormally high pore pressure gradient which ranges from 16.7 kPa/m to 21.7 kPa/m. The stress regime of the Luzhou block is primarily strike-slip type, with an overburden pressure gradient of 25.5kPa/m, and a minimum horizontal stress gradient range of 18.8 to 24.5kPa/m. According to wellbore breakouts and acoustic emission experiments of cores, the ratio between σhmax and σhmin is 1.165. The horizontal principal stress of the reservoir increases with the increase of Young's modulus and pore pressure. The conclusion is that high-precision geomechanical models can effectively serve to improve the efficiency of drilling operations, improve the production of single wells and benefit development. © 2023 57th US rock Mechanics/Geomechanics Symposium. All rights reserved.

关键词： Pore pressure

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research on Optimal design of Bottom Hole Assembly of directional Well in Gadin-North Gadin Gas Field 13th

Research on Optimal Design of Bottom Hole Assembly of Direct...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Zhou, Tuo Li, Hang-Yuan Xiao, Yue Zhang, Wei Jin, Yu-Lai Zhou, Hai-Qiu Tang, Xue-Ping CNPC Engineering Technology R&D Company Limited Beijing102206 China College of Petroleum Engineering Beijing China National Engineering Research Center for Oil and Gas Drilling and Completion Technology Beijing China

ISBN: (纸本)9789819702558

Aiming at the problems such as difficulty in controlling well trajectory and easy occurrence of complex downhole accidents in directional deviation operation in salt-paste interbed of directional deviation well in Gadin-North Gadine gas field, position characteristic model and curvature calculation model are established by optimizing parameters affecting the performance of drill assembly, and the size and length of screw, drill collar and centralizer are analyzed and studied. The results show that the screw diameter and the centralizer diameter have a significant influence on the inclination building ability, and the change of drill collar length and drill collar diameter has a gentle influence on the inclination building ability. By adjusting the drill assembly size, the well inclination Angle can be optimized by 0.31°/30 m and 0.23°/30 m, respectively. The optimal result of the BHA provides the BHA optimization idea for the subsequent directional well drilling operation construction of the gas field, and better exploration and development. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Screws

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Applicability Analysis and Optimization of Special Well in East Ilijik Thin reservoir 13th

Applicability Analysis and Optimization of Special Well in E...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Zhou, Tuo Li, Hang-Yuan Xiao, Yue Jin, Yu-Lai Zhang, Liang Guo, Qi-Jun Jiang, Fu-Hua Bahedaer, Baletabieke Zhao, Nai-Peng CNPC Engineering Technology R&D Company Limited Beijing102206 China College of Petroleum Engineering Beijing102249 China Beijing102299 China Petrochina Changqing Oilfield Company Xian710018 China

ISBN: (纸本)9789819702558

East Iljik Gas field is located in the new development block of the western part of the project on the right bank of the Amu darya river. The cap layer is a thick salt-paste layer, and the reservoir thickness is thin and the transverse development changes greatly. The conventional well type is difficult to achieve the development purpose, and special process wells should be considered to solve the problem of efficient and economic development of this kind of difficult-to-use reservoir. In this paper, combining with the characteristics of gas reservoir and gas field development present situation, the strata and reservoir properties, comprehensive considerationcomparative analysis of special process well increase yield of single well production, carry out four kinds of special process well well type suitability evaluation, studies have shown that, on the right bank of stepped horizontal well in the amu darya project in the western region has great application potential, can the efficient mining block gas reservoir potential, It provides a new technical idea for exploration and development, as well as a better choice for the optimal design of well trajectory, and has a broad application prospect in the western region of the right bank of the Amu darya river project. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Horizontal wells

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Nanoparticles Improved Sedimentation Stability of Oil-Based Completion Fluids While drilling Ultra-deep Wells

Nanoparticles Improved Sedimentation Stability of Oil-Based ...

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2023 Abu dhabi International Petroleum Exhibition and Conference, AdIP 2023

作者： Yan, L.L. Wang, J.H. Ni, X.X. Sun, J.S. Wang, r. Zhang, J.Q. Cui, X.B. CNPC Engineering Technology R&D Company Limited Beijing China National Engineering Research Center of Oil & Gas Drilling and Completion Technology Beijing China

ISBN: (纸本)9781959025078

The deep and ultra-deep oil and gas resources are important sources to meet the increasing oil and gas demands. But they are difficult to be explored because their buried geological conditions are extremely complex, such as high temperature (HT), high pressure (HP), thick salt and gypsum beds and borehole collapse. Oil-based drilling fluid (OBdF) is the preferred drilling fluid for ultra-deep wells due to its better wellbore stability and higher lubricity than water-based drilling fluid. Meanwhile, the oil-based completion fluid (OBCF) is also the first choice for operators because it can be turned directly by the OBdF, which is convenient and reusable. However, barite sag is often encountered because the completion fluid is required to be static for 7 to 15 days at a high temperature of more than 180°C, which results in serious problems, pipe sticking, density variation and well control problems, in ultra-deep wells. It is urgent to improve the sedimentation stability of OBCF while drilling the ultra-deep wells. In this paper, a modified nano-silica stabilizer was prepared to improve the sedimentation stability of OBCF. Its dispersity in a water-in-oil (W/O) emulsion with an oil-water ratio of 80:20 was observed by a cryo-scanning electron microscope and the viscosity at low shear rates was also tested. Then OBCF formulations with different densities were developed and modified by the prepared nano-silica stabilizer. The rheology and sedimentation stability were evaluated on HTHP rheometer and sedimentometer, respectively. The HTHP sedimentometer can work at a pressure up to 105 MPa and a temperature up to 300°C. results indicated that the novel nano-silica stabilizer could disperse stably in the water-oil interface and in the oil phase. The viscosity of the W/O emulsion at low shear rates was significantly increased after adding the nano-stabilizer. Meanwhile, the HTHP rheology and sedimentation stability of the high-density OBCF were improved by the nano-stabiliz

关键词： Scanning electron microscopy

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What is Learned from Polymer Flooding Practices in Offshore reservoirs?

What is Learned from Polymer Flooding Practices in Offshore ...

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2023 Offshore technology Conference, OTC 2023

作者： Guo, Hu Wang, Zhengbo dang, Sisi Wen, rui Lyu, Xiuqin Liu, Huifeng Yang, Meng China University of Petroleum-Beijing CNPC Research Institue of Petroleum Exploration Development PetroChina Xinjiang Oilfield Company Sinopec Northwest Oilfield Company CNPC Engineering Technology R&D Company Limited

ISBN: (纸本)9781613999745

Polymer flooding is very promising chemical enhanced oil recovery technique because it has been widely field tested in many oil fields and commercially applied in several countries in onshore reservoirs. The understanding of polymer flooding mechanisms is still developing, even though the principal mechanism was sweep efficiency increase due to reduced mobility ratio of water and oil due to reduced mobility of water. The incorporation of polymer flooding mechanisms and practical challenges make some projects fail to attain economical or technical goal. For offshore reservoirs, the polymer flooding becomes more difficult because of limited space and harsh reservoirs. Although there were hundreds of polymer flooding field tests in onshore reservoirs, polymer flooding in offshore reservoirs remains limited. In this paper, the previous onshore polymer flooding lessons and findings were briefly reviewed to look into the mechanisms which can guide the design of polymer flooding in offshore reservoirs. Then, the lessons learned from previous offshore reservoirs were reviewed. Advices were given to improve the field test performance. it is conclude that low concentration polymer solution with moderately-low viscosity should be injected into offshore reservoirs to keep displacing pressure between injectors and producers. The injected polymers should have good transportation ability which avoids the formation blockage. The optimum injection timing remains to be further investigated because the evidences. The injection rate should be controlled to avoid well casing damage which has been observed in onshore reservoirs. Except for Bohai oilfield, the formation blockage was not reported in offshore reservoirs. However, the microfracture can form in injectors which improved the injectivity of polymers as long as the injected polymers have good transportation capacity. © 2023, Offshore technology Conference.

关键词： reservoirs (water)

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Study of Fe-doped Ordered Mesoporous Titanium dioxide Synthesis 3

Study of Fe-Doped Ordered Mesoporous Titanium Dioxide Synthe...

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2022 3rd International Conference on Material Chemistry and Composite Materials, MCCM 2022

作者： Yan, Zhiyuan ren, Han Geng, Yuan Yuan, Yuehui Meng, Sicong Cheng, rongchao Qu, Yuanzhi Wang, ren Yang, Hong Gao, Shifeng Zhang, Yan Zhang, Zhilei CNPC Engineering Technology R&D Company Limited Changping Beijing China National Engineering Research Center of Oil & Gas Drilling and Completion Technology China

Titanium dioxide is often designed as an excellent catalyst carrier and photocatalyst due to its tunable structure. In this paper, iron-doped ordered mesoporous titanium dioxide was prepared. These powders were characterized by X-ray diffraction (Xrd), transmission electron microscopy (TEM) and nitrogen physisorption (BET). It was found that mesoporous titanium dioxide powders containing 1% Fe doping were roasted at 350 °C to favor the formation of ordered mesoporous titanium dioxide. This is due to the fact that Fe doping can enhance the pore structure and improve the orderliness of pores, while the increase in temperature can accelerate the growth of grains. © Published under licence by IOP Publishing Ltd.

关键词： Iron

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Automated Identification of Lithology from drilling Cuttings Based on deep residual Network

Automated Identification of Lithology from Drilling Cuttings...

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2023 SPE/IAdC Middle East drilling technology Conference and Exhibition, MEdT 2023

作者： ding, Yan Cui, Yi Xin, Qing Qing Xie, Yong Gang Gao, re Yu Zhao, Fei CNPC Engineering Technology R&D Company Limited Beijing China Research Institute of Oil & Gas Technology PetroChina Changqing Oilfield Company Shaanxi Xi'an China

ISBN: (纸本)9781613999974

Identification of lithology from drilling cuttings is a key step for reservoir characterization. At present, the traditional method is to collect and analyze the cuttings by manual interpretation, which is subjective and time-consuming. In order to improve the accuracy, timeliness, and automation of identification of cuttings lithology, this paper completed lithology identification and classification through batch iterative training based on resnet-34 network. Automated rock type identification from cuttings images captured by a given camera is the goal of this work. The main challenge in cuttings recognition is the similarity of color and grain size in two or different cuttings. Another important factor is that the light source of the camera. In order to capture the images of cuttings more comprehensively for identification, a single light source with 8 channels (ultraviolet, blue, green, yellow, red, infrared, far infrared, and white light) was used to irradiate the cuttings during the imaging process, and the imaging information of cuttings in the full spectral segment can be obtained as the input of the deep learning network. In order to solve the overfitting problem caused by data duplication under different light sources, the input images are first preprocessed by brightness equalization and random cropping, so that each grayscale image can have the same brightness and do not have too much repetition under different light sources. In terms of the efficiency and accuracy, resnet-34 is selected as the model framework of cuttings recognition and classification. The overall accuracy of the model is increased to 98.6% combined with the actual hardware support in the field, which promotes the more efficient identification of logging cuttings and provides a theoretical basis for improving the online logging of logging in the field. Copyright 2023, SPE/IAdC Middle East drilling technology Conference and Exhibition.

关键词： Lithology

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Selection of Acid Types to Achieve Uniform Stimulation in Long Laterals of Horizontal Wells

Selection of Acid Types to Achieve Uniform Stimulation in Lo...

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2023 Abu dhabi International Petroleum Exhibition and Conference, AdIP 2023

作者： Huifeng, Liu Ning, Xu Qi, Liu Hongzhao, Tian Yue, Ming Zhangxin, Chen CNPC R&D DIFC Company Limited Dubai United Arab Emirates Department of Chemical and Petroleum Engineering University of Calgary CalgaryAB Canada CNPC Engineering Technology R&D Company Limited Beijing China Geology Research Institute of Great Wall Drilling Company of CNPC Liaoning Panjin China School of Civil and Resource Engineering University of Science and Technology Beijing Beijing China

ISBN: (纸本)9781959025078

Horizontal wells with long laterals are being used to develop low-permeability carbonate reservoirs in the world. After completion of a well, acidizing is usually conducted to remove the potential damage caused by drilling and completion. However, in bullheading acid injection, it is usually difficult for the acid to distribute evenly along a lateral due to quick consumption of acid along the wellbore, especially in MrC (Maximum reservoir Contact) wells or wells with long laterals (>1000m). In many cases the toe area is even left un-stimulated at all. different types of retarded acids are being developed in industry to reduce acid consumption rate in order to let them penetrate further, but the effective travelling distances of these acids are never systemically studied and compared, leaving field engineers a difficulty in selecting an acid for a specific well. In our work, the properties of different types of acids in industry are reviewed. A flow and reaction model with consideration of acid flow friction and acid-rock reaction kinetics is established and a method is found to solve it. Five typical cases are run based on the model and the results of an effective acid flowing distance, effective acid reacting distance and effective acid travelling distance are obtained and compared. Based on our study, two principles of selecting acid types for horizontal wells with long laterals are proposed: "flow to the toe" and "react to the toe", which mean the friction of an acid as well as the leak off rate of the acid should be small enough to let the fluid reach the toe under a given injection rate;the diffusion rate of H+ and the acid-rock reaction rate must be small enough to ensure that the acid is still active when it reaches the toe. Four key considerations are proposed regarding acid type selection: acid flow friction, acid leak off rate, mass transfer of H+, and acid-rock reaction rate. A general guideline for the key parameter control and acid type selection to ach

关键词： Oil field equipment

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