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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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Well depth monitor software design based on laser distance measuring device

Well depth monitor software design based on laser distance m...

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Abu dhabi International Petroleum Exhibition and Conference 2020, AdIP 2020

作者： Han, Haochen Hu, Yongjian Zhang, Yong Sun, Qi Sun, Chengqin Fang, Zhimeng Chen, Haoweu CNPC Engineering and Technology R&D Company

ISBN: (纸本)9781613997345

Well depth is one of the most valuable parameters in drilling engineering. Commonly well depth is calculated by the absolute difference in height based on the revolution of drawwork sensor, which is a pulse encoder or incremental optical encoder. Both encoders have complicated calibration process, and the measurement is easily disturbed. different from the traditional indirect measurement from the drawwork sensor, the direct measurement provided by laser distance device can simplify the process and decrease the systemic error. The principle of the measurement is to calculate the distance by the product of the atmospheric refraction coefficient and the speed of light. In our design, we fixed the laser distance device on the hook and placed the reflector under the crown to measure the height variant. Modern industrial laser distance device with high accuracy can finish multiple measurements per unit time and calculate the average to reduce the measurement error effectively. The well depth measurement system software based on laser distance measuring device can shorten and simplify the calibration process or even realize automatic calibration. The laser distance measuring device can be used effectively in the severe weather, such as strong winds, and minimize the error caused by manual operation. We completed the optimization of laser distance sensor and selected Sick dL 100 as the main laser sensor, as well as a laser measurement prototype in lab. After thousands of trials and errors, it turns out to be applicable. In order to be compatible with the new well depth measurement system, we developed a corresponding software *** Framework and WPF. With the help *** framework and WPF, UI and core codes of the software are separated in physical isolation, which can improve the development efficiency and make preparation for further extension and optimization. The software supports portal communication and ethernet, which can connect with the laser distance device conv

关键词： Signal encoding

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Challenge of temperature control for downhole instruments in HTHP reservoir

Challenge of temperature control for downhole instruments in...

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SPE Offshore Europe Conference and Exhibition 2019, OE 2019

作者： Gao, Wenkai Liu, Ke Jia, Hengtian Hong, difeng Teng, Xinmiao CNPC Engineering Technology R and D Company Limited

ISBN: (纸本)9781613996645

With the further exploration of oil and gas, we have to search for new resources which buried in deep strata, and most of the deep and ultra-deep wells are categorized in high-pressure/high-temperature (HPHT) wells. The problem of high temperature and the challenge to the existing downhole equipments are becoming increasingly prominent, where the drilling depth is severely restricted. The conventional measurement while drilling tools with common electronics will experience very high failure rates at these conditions. One of the solutions is called the active cooling technology, which can transfer the heat from electronics system to downhole environment. By this way, the temperature control of downhole instrument circuit system is realized. The active cooling technology is expounded in this paper, expecially about the principles and development status of each system. After evaluating and analyzing the characteristics of this technology, the function of heat transfer and constituent elements for the cooling system are summarized. The study from this work demonstrates the future work for downhole cooling technology: large refrigeration capacity, small size, strong adaptability and modularization. Copyright 2019, Society of Petroleum Engineers

关键词： Instrument circuits

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A rapid evaluation technique of sweep efficiency for tight oil reservoir recovered with gas flooding

A rapid evaluation technique of sweep efficiency for tight o...

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SPE/AAPG/SEG Unconventional resources technology Conference 2020, UrTeC 2020

作者： Mu, Lingyu Liao, Xinwei Zhao, Xiaoliang Zhang, Jingtian Zou, Jiandong Chu, Hongyang Shang, Xiongtao Beijing China CNPC Engineering Technology R&D Company Limited Beijing China

due to the special micro-pore structure and the seepage law of tight reservoirs, the research on the development of tight oil is quite different from conventional reservoirs. For the tight oil reservoirs recovered with the gas injection, the gas breakthrough is an eternal theme as a result of the preferable mobility of the gas and the strong heterogeneity of the reservoirs. It is extremely important to evaluate the sweep efficiency. Based on the stream-tube method and the non-darcy theory, this paper establishes a rapid evaluation technique of sweep efficiency considering the mechanism of the gas flooding and the seepage characteristics of the tight oil reservoir. Firstly, the relative permeability under different miscible condition are determined through the revised Coats model. Besides, the Todd-Longstaff model is adopted to describe the varying viscosities of oil and gas. Secondly, the stream-tube model of the inverted nine-spot well pattern with fracture is established. Next, the seepage equations of oil and gas in the stream-tube is constructed considering the threshold pressure and the variation of the viscosity and relative permeability. Then, the sweep efficiency is obtained by solving these equations. Furthermore, an application example for evaluating the sweep efficiency is presented and sensitivity analyses are conducted to study the effect of the viscosity, pressure difference, fracture permeability and well spacing taking the case of a real tight reservoir. Through the analyses, it can be concluded that the factors have remarkable impacts on the sweep efficiency. The threshold pressure increases the resistance and reduces the flow rate, leading to a lower sweep of the injected gas. Even worse, the excessive threshold pressure results in that the effective displacement cannot be established. The fracture greatly shortened the breakthrough time and result in early channeling of the injected gas. The sweep efficiency is improved through the increase of the

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Study on Screening and Performance Evaluation technology of Salt-Tolerant Foaming Agent 13th

Study on Screening and Performance Evaluation Technology of ...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Jin, Yi Gao, Xiang Liu, Jian-Quan Chang, Qi-Fan Ye, Zhi-Lin Sun, Xun Zhang, Shi-Ling CNPC Engineering Technology R&D Company Limited Beijing China Beijing China

ISBN: (纸本)9789819702596

Foam drainage gas recovery technology is one of the most important technologies in drainage and gas production of shale gas wells. The effect of foam drainage which the main component of foaming agent is surfactant mainly depends on the type and performance of the foaming agent. In Jidong, Zhejiang and other oilfields, the salinity of formation water is high, which has strong inhibitory effect on the activity of surfactants. Therefore, it is necessary to select surfactants with high salt resistance as foaming agents. In this paper, we screened a foaming agent that can be dissolved and stable in the formation water with high salinity by evaluating the foaming ability, stability, liquid carrying capacity, compatibility and surface activity of four different types and concentrations of foaming agents with roche foam tester, liquid carrying rate tester and other relevant instruments. The results show that the foaming agent has good foaming and stability, better liquid carrying capacity and surface activity, and it can be used less with higher economic benefits than others, which provides a feasible scheme for the selection of foaming agent in shale bubble drainage process. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Surface active agents

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Numerical simulation of shallow conductor-soil displacement characteristics in deep water drilling 58

Numerical simulation of shallow conductor-soil displacement ...

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58th US rock Mechanics / Geomechanics Symposium 2024, ArMA 2024

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

ISBN: (纸本)9798331305086

Since the shallow soil is mostly composed of clay with weak cementation, the subsea wellhead is easy to be affected by external loads in the initial stage of installation, and the stability of the subsea wellhead is weak, which is prone to serious accidents such as sinking and tilting of the wellhead, resulting in significant economic losses and threatening the safety of deep-water operations. The traditional p-y curve calculation model cannot well reflect the vibration of the subsea wellhead and the detachment and displacement of shallow soil around the surface conductor. However, the Goodman contact element model in numerical simulation can simulate the discontinuity characteristics of the conductor-soil contact interface. In this paper, the numerical simulation method is used to discuss the vertical displacement characteristics of subsea wellhead under cyclic dynamic load and the displacement characteristics of shallow soil particles in different directions and depths around the surface conductor, and the factors affecting the displacement characteristics of conductor and soil are analyzed by load type, conductor installation depth, conductor diameter, and wellhead height above the mudline. It is important to explore the displacement characteristics of subsea wellheads and shallow soil for the design and stability evaluation of subsea wellheads. Copyright 2024 ArMA, American rock Mechanics Association.

关键词： Wellheads

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research on Targeted Hydraulic fracturing control method based on theoretical model 57

Research on Targeted Hydraulic fracturing control method bas...

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57th US rock Mechanics/Geomechanics Symposium

作者： Wang, W.Z. Yang, G. Wang, H.G. Zhou, Z. Wang, L. CNPC Engineering Technology R&D Company Limited Beijing China Beijing China

ISBN: (纸本)9780979497582

Targeted Hydraulic Fracturing (THF) is an effective method to increase oil or gas well production. This method involves injecting fluid into the reservoir to create fractures and stimulate the flow of hydrocarbons. Vuggy carbonate reservoirs provide a unique structure, allowing THF to optimize production. The key to successful fracturing is accurate targeting of the reservoir and the creation of artificial fractures connecting with the reservoir through construction methods. Therefore, in vuggy carbonate reservoirs, the turning radius of fractures is critical. The turning radius is affected by various factors, including the pre-existing fracture angle and construction parameters. A fracture expansion model that considers the influence of fluids was established to simulate the trend of fluid energy dissipation and the effect of internal fluid pressure on the expansion of fractures. Moreover, an accurate quantitative evaluation was conducted on the factors affecting the fracture turning range. © 2023 57th US rock Mechanics/Geomechanics Symposium. All rights reserved.

关键词： Fracture

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research on small molecule wetting agent for drilling fluids applied in Antarctic drilling engineering

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Petroleum Science 2025年

作者： Huang, Ning Sun, Jin-Sheng Liu, Jing-Ping Lv, Kai-He deng, Xue-Fei Yi, Hai-Jiang School of Petroleum Engineering China University of Petroleum (East China) Shandong Qingdao 266580 China CNPC Engineering Technology R & D Company Limited Beijing 102206 China

Antarctica contains numerous scientific mysteries, and the Antarctic ice sheet and its underlying bedrock contain important information about the geological structure of Antarctica and the evolutionary history of the ice sheet. In order to obtain the focus of these scientific explorations, the Antarctic drilling engineering is constantly developing. The drilling fluid performance directly determines the success or failure of drilling engineering. In order to enhance the poor performance for drilling fluids due to poor dispersion stability and easy settling of organoclay at ultra-low temperatures, the small-molecule wetting agent (HSr) for drilling fluid suitable for Antarctica was prepared by oleic acid, diethanolamine and benzoic acid as raw materials. Its chemical structure, properties and action mechanism were investigated by various experimental methods. The experimental results showed that 2% HSr could improve the colloidal rate for drilling fluid from 6.4% to 84.8%, and the increase rate of yield point was up to 167%. Meanwhile, it also made the drilling fluid excellent in shear dilution and thixotropy. In addition, 2% HSr could increase the density from 0.872 to 0.884 g/cm³ at −55 °C. And the drilling fluid with 2% HSr had a good thermal conductivity of 0.1458 W/(m·K) at −55 °C. This study gives a new direction for the research of drilling fluid treatment agents suitable for the Antarctic region, which will provide strong support for the scientific exploration of the Antarctic region. © 2025 The Authors

关键词： Antarctic drilling engineering drilling fluid Mechanism study Performance evaluation Wetting agent

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Prediction Method of Cutting Settling Velocity in Gas-liquid Two-phase Flow Based on Multi-gene Genetic Programming 56

Prediction Method of Cutting Settling Velocity in Gas-liquid...

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56th U.S. rock Mechanics/Geomechanics Symposium

作者： Zhu, Zhaopeng Song, Xianzhi Han, Liang Zhang, rui Liu, Wei Fu, Jiasheng Hu, Xiaoli Li, dayu Qin, Furong Yang, donghan Beijing China CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9780979497575

The cuttings settling process becomes erratic in the complex gas-liquid mixture under gas kick, it is very difficult to accurately describe the migration process of cuttings. Meanwhile, the traditional empirical formula based on fitting experimental data is difficult to accurately predict the complex cuttings settlement. Neural network and other intelligent models with high prediction accuracy are difficult to be popularized and applied due to their black box properties. Multi-gene genetic programming can accurately describe complex nonlinear problems and automatically optimize the structure and parameters of the mathematical model, so as to effectively reduce the complexity of the model. Based on the multi-gene genetic programming algorithm, this study used a variety of input parameters to predict the settling velocity, explored the relationship between the input variables and the result, and established an explicit mathematical model of settling velocity with rMSE of 0.0896 in test set and r2 of 0.9292, which breaks the accuracy limits of traditional empirical model and the inexplicability of neural network model. This new method for predicting cuttings settling velocity in gas-liquid mixture can provide theoretical guidance for efficient cuttings migration in wellbore during gas kick. © 2022 ArMA, American rock Mechanics Association.

关键词： Genetic algorithms

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Experimental study of flow field in solution mining period of salt cavern gas storage 57

Experimental study of flow field in solution mining period o...

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57th US rock Mechanics/Geomechanics Symposium

作者： Guan, Yueyang Ban, Fansheng He, Qi Che, Yang Xu, Nan CNPC Engineering Technology R&D Company Limited Beijing China Beijing China

ISBN: (纸本)9780979497582

Solution mining is the most critical process for salt cavern gas storage. So far Salt cavern gas storages in China are mainly single-well-cavity, and the time of dissolution between two and four years. Solution mining utilize intermediate hanging string and long hanging string for direct circulation and reverse circulation. In the process of solution mining, fluid velocity and different mode of circulation have a great influence on the longitudinal and transverse expansion of the cavity. Therefore, in order to research the changes of the flow field in different working conditions, this study uses Particle Image Velocimetry for flow field analysis. In the laboratory, using large- scale transparent models for laboratory simulation experiments. According to the experimental results, under direct circulation mode, water flows through the right space to upper part. Angle of reflux was in the range of 28° - 56°. The maximum influence radius of direct circulation flow field is 48.1m. In reverse circulation mode, if the distance from the intermediate hanging string to the insoluble matter is less than 2.44m, insoluble matter may affect circulation. © 2023 57th US rock Mechanics/Geomechanics Symposium. All rights reserved.

关键词： Flow fields

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