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Analysis and countermeasures of drilling challenges in complex ultra-deep exploration wells in thrust structural belt with multiple salt layers 6

Analysis and countermeasures of drilling challenges in compl...

引用

2023 6th International Workshop on Environment and Geoscience, IWEG 2023

作者： Zhang, Wei Zhou, Tuo Jin, Yulai Xiao, Yue Li, Hangyuan Baletabieke, Bahedaer Gu, Yixin CNPC Engineering Technology R&D Company Limited Beijing China College of Petroleum Engineering Beijing China

The deep and ultra-deep zones of Bokhtar oilfield in Tajikistan are the critical blocks for future exploration and development, which are imbedded between two salt layers, accompany with four reservoir and cap assemblages of middle and upper Jurassic, Lower Cretaceous, Upper Cretaceous and Paleogene. The reservoir and cap assemblages of pre-salt carbonate and salt-gypsum cap have great potential. The complicated geological structure, uncertain formation and non-developed pre-salt formations made the critical challenges for drilling operation, including: (1) The difficult casing program design caused by peripheral compression and thrust of the basin, the complicated geological structure, the large geological difference above and below the salt layer, the unfaithful prediction of multiple sets of salt layer, great formation pressure uncertainty, and many sealing points;(2) The upper salt formations are featured by developed thrust belt and large dip angle, the contradiction between deviation prevention and drilling acceleration in high steep structure is prominent, and the wellbore quality is difficult to control;(3) due to the mud loss in upper salt layer, loss coexisted with blow out in the salt layer and inaccurate prediction of salt bottom, the drilling complexes such as mud loss, overflow and well collapse are occurred frequently;(4) Ultra-deep well depth (over 7000m), HTHP (180°C,140MPa), multiple salt layers and long open hole section made high requirements on high temperature resistance of drilling fluid, cementing slurry and downhole tools, as well as high drilling risk and cost. It is necessary to carry out the drilling difficulties investigation of ultra-deep exploration well under the consideration of pertinence, safety, applicability and economy, then formed the suitable drilling engineering plan for Bokhtar Block through the optimization of domestic and foreign advanced and mature deep and ultra-deep well technologies, which is used to provide the techni

关键词： Quality control

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A Novel Methodology to reduce Carbon Footprints: Trials of residual Heat recycling in China and Middle Asia 83

A Novel Methodology to Reduce Carbon Footprints: Trials of R...

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2022 SPE EuropEC - Europe Energy Conference featured at the 83rd EAGE Annual Conference and Exhibition, EUrO 2022

作者： Fu, Jin Cui, Longlian Yang, Guobin Zhang, Shunyuan Chen, Chen CNPC Engineering Technology R&D Company Ltd.

ISBN: (纸本)9781613998656

As a mature methodology to enhance recovery of heavy oil, ultra-heavy oil and tar oil, steam assisted gravity drainage has been adopted in several oil production regions in China since 1990's. Liaohe Oilfield which is located in the northeastern part of China has become the most important production base of heavy oil in China. Heavy oil reservoirs in Kenkyak Oilfield Kazakhstan are found on a semi-dessert plain where saline soils are widely distributed. The cold production techniques used to be deployed in Kenkyak Oilfield, but the relatively low recovery rates have made the operator to carry out a feasibility research on steam injection. The steam assisted gravity drainage technology enhances recovery rates of heavy oil, producing a large amount of heat at the same time. The thermal resources are residual heat of hot separated water from the boiler's moisture separator, residual heat of produced fluid associated by crude oil, residual heat flue gas injected into the boiler. The separated water is as hot as steam, with a flow rate of 25% of the gas injection volume. The produced fluid associated by crude oil is at 160°C, with a flow rate of 1.1 times of the gas injection volume. The flue gas is at 240-250°C, much hotter than flue gas generated by conventional boilers. The residual heat does not only affect on-site operation and management, but also results in waste of thermal energy. Now the residual heat of produced fluid and separated water is deployed to heat supply water and fuel. Based on geological conditions and on-site operation requirements, there is neither a river to cool the residual heat, nor a common heating system to generate a large amount of thermal energy. Besides, both Chinese government and Kazakhstani government are adopting strict environment protection laws, banning direct discharge of waste water and extraction of underground water in the oilfields. A once-through boiler steam injection boiler generates humid steam with a dryness fraction of

关键词： Crude oil

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research on System Efficiency Evaluation of dilute Pumping Unit Based on Clustering 12th

Research on System Efficiency Evaluation of Dilute Pumping U...

引用

12th International Field Exploration and development Conference, IFEdC 2022

作者： Li, Bing Zhou, Bo Yu, Jing He, Liu Tan, Chao-dong CNPC Engineering Technology R&D Company Limited Changping Beijing China Changping Beijing China

ISBN: (纸本)9789819919635

System efficiency is an important index to evaluate energy consumption and management level of pumping *** evaluation of system efficiency is of great significance for parameter adjustment and optimization decision. At present, the evaluation index of system efficiency of dilute pumping Wells in oilfield is single, and the influence of dilute is not considered, so it cannot point out the direction of system efficiency improvement. In this paper, the system efficiency calculation model of dilute pumping Wells is established, the system efficiency evaluation index set is established by analyzing the influencing factors of the system efficiency of dilute pumping Wells, and the system efficiency evaluation model suitable for dilute pumping Wells is established by using cluster analysis algorithm. Through the establishment of the evaluation method of doped rare of well pumping unit is analyzed, according to the results of the characteristics of the mixing thin oil well classified effect is good, the low efficiency of Wells are pumping unit balance to solve the problem of poor or motor power factor smaller downhole inefficientmixing thin oil well has a small stroke, at times, more big, the mixed liquid viscosity,mixing amount of dilute,mixed with characteristics of thin oil density is not reasonable, the results show that the model can quickly classify the efficiency of diluted oil well system and provide direction for the efficiency optimization of diluted oil well system. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.

关键词： Oil wells

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research on the Correlation Analysis Between Logging Parameters and rock drillability Based on random Forest 6

Research on the Correlation Analysis Between Logging Paramet...

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6th International Conference on Frontier Technologies of Information and Computer, ICFTIC 2024

作者： Lv, Congyue Zhao, Fei ding, Yan Cui, Yi Gao, reyu Wang, Ge Tian, Yumeng Jia, Wenting Lin, Boyang Li, Linfeng Cnpc Engineering Technology R&d Company Limited Beijing China College of Petroleum Engineering Beijing China

ISBN: (纸本)9798331541750

The rock drillability grade value is a comprehensive parameter that measures the ease or difficulty of rock fragmentation during drilling. determining this parameter is crucial for guiding bit selection and predicting drilling speed. There exists a strong correlation between certain logging parameters and the rock drillability grade value. To explore this correlation, a common practice is to use the Pearson correlation coefficient method, which mainly investigates the linear relationship between variables. However, relationships among complex formation characterization parameters are often nonlinear. To evaluate the pros and cons of the two analytical methods when dealing with nonlinear and complex data, a comparison was made, and the random forest algorithm was preferentially selected as the analytical tool to enhance the precision of the prediction model. Thus, this paper analyzes the correlation between logging parameters and the rock drillability grade value based on Pearson correlation analysis and the random forest algorithm. Using the Matlab programming language, logging parameter correlation analysis software named Correlation 1.0 was developed. The random forest algorithm was preferred to screen out logging parameters with high correlation to the drillability grade value (drilling depth and formation density), providing a new approach for establishing a high-precision formation rock drillability model. © 2024 IEEE.

关键词： rock drills

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A new drill bit selection method based on machine learning and intelligent optimization process 57

A new drill bit selection method based on machine learning a...

引用

57th US rock Mechanics/Geomechanics Symposium

作者： Liu, Z.H. Song, X.Z. Ye, S.L. Yin, Z.Y. Ji, Y. Zhang, C.K. Ma, B.d. Zhu, Z.P. Han, L. Beijing102249 China CNPC Engineering Technology R&D Company Limited Beijing102206 China

ISBN: (纸本)9780979497582

In the process of oil and gas drilling, the drill bit is the direct tool to break rock. The selection of drill bit needs to consider formation factors, drilling construction factors, field size requirements and other factors. At present, the optimization methods mainly include mechanical analysis, cost analysis, neural network method and other methods, but there are some limitations. In this paper, three categories and more than ten kinds of input parameters are selected, and the rate of penetration is predicted by BP neural network algorithm. Then, the bit library is established according to the actual bit used in the field, and the parameters of the bit are optimized by intelligent optimization process, and the actual demand is taken as the constraint to select the most suitable one. The error of the rOP prediction model was within 10%, and the rOP was increased by 11.67% on average with the optimized bit. In this paper, the rock breaking rule and complex mechanism of drill bit are stored in the model, and the drill bit optimization is carried out according to the actual requirements, which can provide a certain degree of support for the field drill bit. © 2023 57th US rock Mechanics/Geomechanics Symposium. All rights reserved.

关键词： Bits

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Integrated research on Well Structure technology of High risk Pre-salt deep Wells in Amu darya river 12th

Integrated Research on Well Structure Technology of High Ris...

引用

12th International Field Exploration and development Conference, IFEdC 2022

作者： Gu, Yixin Zhang, Wei Zhou, Tuo Baletabieke, Bahedaer Xiao, Yue CNPC Engineering Technology R and D Company Limited Beijing China

ISBN: (纸本)9789819919635

The Amu darya river natural gas project is a major energy cooperation project between China and Turkmenistan, as well as the main gas supply source for the China-Central Asia natural gas pipeline. It is rich in natural gas resources, ranking first in Central Asia and fourth in the world. The smooth implementation of the project will play an exemplary and leading role in promoting win-win cooperation in various fields among countries along the Belt and road. Many drilling difficulties such as shallow secondary high pressure gas reservoir drilling, directional drilling in ultra-thick salt-gypsum formation, drilling acceleration in hard gypsum layer, have been solved through the special researches in the past 10 years. However, along with the development of the Block which has entered into the middle and later periods, the production rate of some wells has decreased to 150,000-200,000 m3/day. due to narrow safe-density window between salt-gypsum layer and high pressure fractured-vuggy carbonate reservoir, mud loss coexist with blow out is becoming more frequent. The only choice to avoid this problem is finish the well ahead the schedule, which gave rise to shorter the horizontal section length less than the half of the designed. Based on the consideration of great reservoir pressure variation, large production discrepancy among wells and unvaried well structure for many years, this paper optimized the casing program to a smaller size, which is helpful to reduce the drilling cost and enhance the penetration rate for Amu darya gas project. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.

关键词： Gases

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research on Flow Field Characteristics Measurement in Variable Cross-Section Annulus Using Particle Image Velocimetry (PIV)

Research on Flow Field Characteristics Measurement in Variab...

引用

2024 SPE Gas and Oil technology Conference, GOTECH 2024

作者： Zhou, Y.S. Qu, C.F. Zhang, H.W. Zhang, H. Jiang, L. Liu, Z.S. Shen, J.Y. Zhang, Z.Z. Zheng, r. CNPC Engineering Technology R&D Company Limited China China University of Petroleum Beijing China

ISBN: (纸本)9781959025405

The actual downhole annulus is irregular, a variable cross-section geometry, due to the difference between the diameter of tool joints, tubing collars or downhole tools and the inner pipes. With the increasing of well depth, it is difficult to predict the annulus pressure loss accurately due to the effect of variable cross-section geometry. research on flow field characteristics in variable cross-section annulus is the theoretical foundation of accurate prediction on annulus pressure loss. However, there is still few research on flow field characteristics in variable cross-section annulus by experiment, especially by using PIV technology. PIV has become an efficient method for complex flow field visualization and analyzation. The results show that there is separated reattachment flow in the irregular annulus which mainly occurred in the downstream of the expansion. The separated reattachment flow has low velocity, but vortex mainly occurred in this area. The disturbance range of streamlines caused by expansion structure is shorter in the upstream than in the downstream. The first and second modes contain 82% energy contribution in the irregular annular flow field. And the first mode can effectively restore the large-scale structure. With the mode increases, it is found that the small-scale structure is mainly distributed in the shear layer of the separated and reattached flow downstream of the variable cross- section geometry. © 2024, Society of Petroleum Engineers.

关键词： Flow fields

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Improvement of rheological and filtration properties of water-based drilling fluids using bentonite-hydrothermal carbon nanocomposites under the ultra-high temperature and high pressure conditions

Improvement of rheological and filtration properties of wate...

引用

SPE/IATMI Asia Pacific Oil and Gas Conference and Exhibition 2021, APOG 2021

作者： Zhong, Hanyi Guan, Ying Qiu, Zhengsong Feng, Jie Liu, Wenlei Wan, Yuan Zhang, Yubin China University of Petroleum East China China CNPC Engineering Technology R&D Company Limited

ISBN: (纸本)9781613997833

With the depletion of the conventional shallow oil/gas reservoirs and the increasing demand for oil and gas, deep drilling become more and more essential to extract the oil/gas from deep formations. However, deep drilling faces many complex challenges. One of the complexities is the degradation of polymers and flocculation of bentonite particles, leading to hardly control the rheological and filtration properties of water-based drilling fluids, especially under ultra-high temperature and high pressure (HTHP) conditions. Therefore, an experimental investigation is performed to study how bentonite-hydrothermal carbon nanocomposites will influence the rheological and filtration properties of water-based drilling fluids under ultra-HTHP conditions. Bentonite-hydrothermal carbon nanocomposites are proposed as non-polymer additives to solve the ultra-HTHP challenge in water-based drilling fluid. The nanocomposites are synthesized by facile hydrothermal reaction, in which biomass starch and sodium bentonite are used as the precursor and template, respectively. In this study, the effect of the nanocomposites on the rheology and filtration properties of water-based drilling fluid are investigated before and after hot rolling at 220 °C and 240 °C. The structure characterization indicates that carbon nanospheres can successfully deposit on the bentonite surface after hydrothermal reaction and finally form as nanocomposites. The elemental carbon content, zeta potential and particle size distribution of the nanocomposites could be adjusted according to the reaction conditions. After thermal aging at 220 °C and 240 °C, addition of nanocomposites can improve the rheological properties significantly where a stable and minor change of rheological properties is observed, which is desirable for ultra-HTHP drilling. regarding filtration control, after adding 1.0 wt% nanocomposite materials, the filtration loss is reduced by 41% and 44% respectively after aging at 220 °C and 240 °C, whi

关键词： Nanocomposites

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development of Balanced Torque drilling Tools 12th

Development of Balanced Torque Drilling Tools

引用

12th International Field Exploration and development Conference, IFEdC 2022

作者： Qiao, Han Cheng, Jin Shao, Qiang Li, Xing-Yue CNPC Engineering Technology R and D Company Limited Beijing China

ISBN: (纸本)9789819919635

drilling of hard formations (especially interlayer) by PdC bits is frequented by severe stick slip and bit bouncing/jumping, and low rOP and short service life of PdC bit restrict the efficient development of difficult-to-drill formations such as those in deep wells. Based on real-time optimization of drilling torque and WOB of PdC bit, and through design parameter matching calculation, lab test and field application, a balanced torque drilling tools that can realize the "peak load shifting" of torque fluctuations was developed. The tool adopts the mechanical transmission mode of spring+spiral guide mechanism by storing and releasing abnormal torque generated during drilling operations, it can realize real-time adjustment of drilling torque movements. The balanced torque drilling tools has been successfully applied in 5 wells of Jilin Oilfield, Changqing Oilfield and Jidong Oilfield, reducing the wellhead torque fluctuation by more than 70% and increasing the footage of bit by more than 100% in conglomerate formations. The balanced torque drilling tools can adaptively optimize the drilling torque, and thus it is well performed in bit protection and rOP enhancement, it also has the advantages of strong applicability, high reliability and low maintenance cost of bit and drilling fluid media. Its successful application can effectively enhance rOPs and shorten the drilling period in hard and complex formations. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.

关键词： Stick-slip

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Performance evaluation of polycarboxylic acid dispersant for oil well cementing 20th

Performance evaluation of polycarboxylic acid dispersant for...

引用

20th Chinese Materials Conference, CMC 2019

作者： Xia, Xiujian Yu, Yongjin Jin, Jianzhou Liu, Shuoqiong Xu, Ming Zhang, Zhengrong CNPC Engineering and Technology R&D Company Limited Beijing102206 China Beijing102249 China

ISBN: (纸本)9783035715668

The conventional oil-well cement dispersant has the characteristics of poor dispersion at high temperature, poor compatibility with other additives, and environmental pollution during the production process. In this paper, with ultra-early strong polyether monomer, acrylic acid, 2-acrylamine-2-methylpropyl sulfonic acid, sodium methacrylate as copolymer monomers, an environmentally friendly polycarboxylic acid dispersant, drPC-1L, was prepared by the aqueous solution free-radical polymerization. The chemical composition and thermal stability of the synthetic copolymer were characterized by FTIr and TGA techniques. The evaluation results show that drPC-1L has a wide temperature range (30~210oC), good salt-resistance and dispersing effect. This material can significantly improve the rheological performance of cement slurry, and well matched with oil-well cement additives, such as fluid loss agent, retarder. Moreover, the polycarboxylic acid dispersant is beneficial to the mechanical strength development of set cement, especially the early compressive strength. It can also inhibit the abnormal gelation phenomenon of cement slurry, flash set, that occurs during high temperature thickening experiments, which plays an important role in enhancing the comprehensive performance of cement slurry. Consequently, the novel polycarboxylic acid dispersant has good application prospects in deep and ultra-deep wells cementing. © 2020 Trans Tech Publications Ltd, Switzerland.

关键词： Compressive strength

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