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Calculation Method of Power Law and Herschel-Bulkley Model of drilling Fluid rheological Parameters Based on Gradient descent 12th

Calculation Method of Power Law and Herschel-Bulkley Model o...

引用

12th International Field Exploration and development Conference, IFEdC 2022

作者： Tian, Yu-Meng Zhao, Yi-Peng Li, Jin Cui, Meng CNPC Engineering Technology R&D Co. Ltd. Beijing China

ISBN: (纸本)9789819919635

The determination of drilling fluid rheological parameters plays an important role in the calculation of drilling circulation friction. The traditional method uses the least squaresmethod to solve the problem. For the Power Lawand Herschel-Bulkley models, by taking the logarithm to linearize of the equation, and then solved by linear regression. This method is not solved in the nonlinear space, it is not the optimal solution to the equation, is only the optimal solution in the linear space. In this paper, according to the characteristics of Power Law and Herschel- Bulkley rheological equations, the gradient descentmethod is used to calculate the local optimal solution of the rheological model. By selecting an appropriate initial value, the iterative algorithm can quickly and stably converge to the target solution range, and obtain accurate rheological parameters. This algorithm directly solves in nonlinear space, so the result is the optimal solution, and has higher precision than traditionalmethods. It is also proved by practical examples, the parameters of the Power Law and Herschel-Bulkley rheological models obtained by this method have higher precision. This method can be applied to the optimization selection of drilling fluid rheological models, and evaluation of drilling fluid property. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.

关键词： drilling fluids

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Factory drilling and Fracturing technology for Tight Sandy Conglomerate Oil reservoir in the Junggar Basin

Factory Drilling and Fracturing Technology for Tight Sandy C...

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Abu dhabi International Petroleum Exhibition and Conference 2022, AdIPEC 2022

作者： Chang, Long Zou, Lingzhan Wang, Haige Yu, Yangfei Liu, Qi Zhuo, Lubin Yu, Jing Wu, Baocheng Xu, Jiangwen Shi, Jiangang CNPC Engineering Technology R&D Company Limited PetroChina Xinjiang Oilfield Company China

ISBN: (纸本)9781613998724

The Triassic Baikouquan Formation reservoir in the Mahu Sag, Junggar Basin is characterized by tight sandy conglomerate oil reservoir with long drilling cycle and great fracturing difficulty. The factory drilling and fracturing techniques of horizontal wells for the Ma131 Well Block of Mahu Oilfield have been determined by regional geological characteristics research and optimization scheme design. The key technologies for horizontal well drilling speed improvement were explored by designing small three-stage wellbore structure, customizing the PdC bit properly, optimizing drilling tool combination, and selecting the drilling fluid with inhibition and plugging ability. The factory reservoir stimulation technique carried out horizontal well hydraulic fracturing with small well spacing for two sets of beds, and adopted bridge plug + clustering perforation staged fracturing and slick water + gel composite fracturing technology. 12 wells in a drilling pad were arranged in the demonstration area with the depth of 5000m, the distance between adjacent sections was 150m or 100m, with the horizontal section length of 1800m. Batching drilling operation pattern was adopted, with 3⁃well drilling for each of rig. rapid inclining prevention drilling through vertical sections adopted PdC bit + screw + MWd, with high rotary speed and high flow rate. In the build-up section, radical drilling parameters was used to improve the top drive rotary speed and release the torque. In the horizontal sections, rotary steering tool + low speed high torque screw was adopted. The application of this technology achieved good results, with average drilling cycle of 48.3 d and average rOP of horizontal section increased by 77%. The fracturing construction adopted high pad fluid ratio, high sand ratio and high pump rate. More than 10,000 m3 fluid was injected in a single well with high-intensity proppant injection. The factory operation was carried out in the order of construction from the two sides

关键词： Horizontal wells

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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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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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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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design Method and reliability Analysis of deep Well Casing Strength

Design Method and Reliability Analysis of Deep Well Casing S...

引用

International Petroleum and Petrochemical technology Conference 2024, IPPTC 2024

作者： Yaxuan, Wang Jiayu, He Hongzhi, Xue Zhiyong, Wei Wang, Lin Weixing, Zhu CNPC Engineering Technology R&D Company Limited Beijing102206 China EnerTech-Drilling & Production Co. CNOOC Energy Technology & Servies Limited Tianjin300452 China

With the development of the petroleum industry, more and more oil fields are beginning to engage in deep well exploration. deep well casing is an important drilling equipment in oilfield development, which is a key factor in ensuring wellbore stability, maintaining production safety, and improving production capacity. However, due to the high requirements for equipment in drilling operations, problems in the design, manufacturing, and installation of deep well casing can easily lead to issues such as poor wellbore stability, oil leakage, and drilling accident safety. Therefore, the performance and reliability evaluation of deep well casing has become a key issue. This article summarizes the research progress of deep well casing strength design methods and reliability analysis through extensive research on existing literature. The main content includes the working principle, design standards, and advantages and disadvantages of different methods of deep well casing, aiming to provide reference for the design and use of deep well casing. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： deep oil well drilling

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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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Methodology for Preventing drill String Fatigue Failure in deep Well with Large Shallow dogleg

Methodology for Preventing Drill String Fatigue Failure in D...

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2024 International Petroleum technology Conference, IPTC 2024

作者： Zhang, Jiawei Huang, Hongchun Zou, Lingzhan Wang, Qing Ji, Guodong He, Xusheng Li, Hailiang deng, Wenxing CNPC Engineering Technology R&D Company Limited Beijing China PetroChina Southwest Oil & Gas Field Company Sichuan China Drilling and Production Technology Research Institute PetroChina Qinghai Oilfield Company Gansu Dunhuang China

ISBN: (纸本)9781959025184

Fatigue failure is recognized as the primary cause of tubular twist-off. repeated cyclic bending loads and stress caused by dogleg severity, pipe weight and buckled drill pipes would result in drill string fatigue failure as seven twist-off accidents have been observed at large shallow dogleg sections in three deep wells with TVd (True Vertical depth) more than 5000m. Fishing jobs, plug-back and sidetracking operations were time-consuming and costly, while typical inspection and cumulative pumping hours can't determine the thresholds for preventing drill string fatigue failure in such scenario. This paper proposes the methodology for preventing drill string fatigue failure in deep wells with large shallow dogleg. The relative fatigue index prediction model is established based on drill string stress characteristics and crack propagation behavior, on the basis of which cumulative fatigue distribution of entire drill string in drilled or pre-drill intervals could be calculated. Considering the added cumulative fatigue for drill string from drilled intervals, methods and procedures including optimizing drilling parameters, reshuffling drill string, replacing with new drill string are proposed for preventing fatigue failure in pre-drill interval. One of the filed applications was carried out in one deep well, which suffered from two drill string failures consecutively with failure position at same large shallow dogleg section. The calculated cumulative fatigue index of the second failure based on actual drilling data was 1.0595, which verified the accuracy of established model for predicting drill string fatigue failure. Also, simulation results showed that cumulative fatigue index rose rapidly when drilling through large shallow dogleg section, which justified all failure positions occurred at same large shallow dogleg section. Cumulative fatigue distribution of entire drill string was determined after two consecutively failures, suggesting that the drill string would

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FdEM modeling on the fracture propagation behavior of hot dry rock subjected to cyclic soft fracturing 57

FDEM modeling on the fracture propagation behavior of hot dr...

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57th US rock Mechanics/Geomechanics Symposium

作者： Wu, Xiaoguang Yang, rui Li, Gensheng Huang, Pengpeng Huang, Zhongwei Liang, rui Long, Tengda State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum-Beijing China CNPC Engineering Technology R&D Company Limited China Downhole Service Company CNPC Chuanqing Drilling Engineering Company Limited China

ISBN: (纸本)9780979497582

Conventional hydraulic fracturing (HF) is an important way to develop Enhanced Geothermal Systems (EGS), but there are some problems such as high injection pressure and having trouble to create complex fracture network. To deal with those difficulties, Cyclic soft fracturing (CSF), an emerging technology, has been proposed, which adopts circulating stress waves to break down rock and forms a volumetric fracture network achieving oil and gas stimulation. In this paper, a numerical model of FdEM and a fully coupled thermal-fluid-solid solver are used to perform CSF experiments on hot dry rock (Hdr) in field scale. The influences of stress disturbance, fracture initiation and propagation and three key parameters on fracture morphology are analyzed. The research results show that CSF can indeed generate complex fracture network under parameter optimization of peak pressure and loading frequency. Compared with conventional HF, CSF forms a larger stress disturbance area and has bigger tensile stress at fracture tip, which may contribute to fracture propagation. Under large stress difference condition, with the increase of peak pressure, the fracture complexity increases first and then decreases. The results are expected to provide an insight into the stimulation mechanisms of CSF method in Hdr geothermal. © 2023 57th US rock Mechanics/Geomechanics Symposium. All rights reserved.

关键词： rocks

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A New Environmental Friendly Oil-Based drilling Fluid 12th

A New Environmental Friendly Oil-Based Drilling Fluid

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12th International Field Exploration and development Conference, IFEdC 2022

作者： Zhang, Jia-Qi Tao, Xie Yan, Li-Li Cheng, rong-Chao Wang, Jian-Hua Yang, Hai-Jun Ni, Xiao-Xiao CNPC Engineering Technology R and D Company Limited Beijing China Beijing China

ISBN: (纸本)9789819919635

A rapid evaluation method for the biodegradability of base oil was established. Through the research of the biodegradation law of base oil components, the core treatment agents such as emulsifier and filter loss reduction agent were further selected, and sodium acetate was used instead of calcium chloride in the internal phase to construct a new formulation of environmentally friendly oil-based drilling fluid. The comprehensive performance evaluation shows that the environmentally friendly oil-based drilling fluid system has good performance such as bio-non-toxic, biodegradable, and heavy metal content, etc. The soil is mixed with the oil-based drilling fluid in the ratio of 8:2 by weight, which can ensure normal plant growth and achieve the purpose of resource recycling. With a temperature resistance of 160 ℃ and a density of up to 2.2 g/cm3, the performance can satisfy the construction of shale oil and gas horizontal wells and can be operated in blocks with high environmental requirements. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.

关键词： Biodegradability

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