bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design and Optimization of Direct-Drive Drilling Permanent Magnet Synchronous Motor
Authors: Mei Lianpeng , Xiao Wensheng , Cui Junguo , Zhang Qingxue , Yu Xiaolong 
Published: November 2024

Abstract
A direct-drive drilling electric drilling tool is developed due to the problems of long transmission link, low efficiency, and high failure rate of traditional electric drilling tools. In this paper, the key components of the direct-drive drilling permanent magnet synchronous motor (DPMSM) are designed and calculated, and the robust parameters optimization is performed by Taguchi method with efficiency and cogging torque as the optimization objectives. The air-gap length, thickness of permanent magnets, pole-arc coefficient, and width of slot top are selected as significant factors, and the impact of the optimized parameters on the efficiency and cogging torque of the DPMSM is calculated with orthogonal experiment to obtain the optimal combination of factors. Comparing the DPMSM’s performance before and after optimization, the cogging torque is reduced by 80.1% and the efficiency is improved by 0.24% after optimization. Finite element simulation of the electromagnetic characteristics of the optimized DPMSM under no-load and load conditions is carried out to verify the rationality of the optimization. Calculate the main losses of the DPMSM and the heat generation rate of key components. The analysis model of the DPMSM’s temperature field is established, and the temperature field simulation is carried out with and without drilling fluid respectively to further verify the rationality of the motor’s design. This work can promote the engineering application of downhole direct-drive electric drilling tools and provide technical support for the innovation of drilling equipments for marine energy.
Study on pretreatment technology of Oilfield Industrial Sewage
Authors: Zhang Yidong 
Published: November 2024

Abstract
At present, Oilfield industrial sewage treatment has not yet formed mature technology. However, with the development of tight oil blocks and the construction of large-scale fracture network fracturing, the industrial sewage generated in A oilfield (including fracturing flow-back fluid, substitution fluid, water for well-flushing, pressure relief water, etc.) has increased year by year. The quality of produced water in oilfield has gradually deteriorated. Oilfield wastewater treatment is becoming more and more difficult. The built oil-bearing wastewater treatment process has shown inadaptability. In recent years, by analyzing the process operation parameters, studying the characteristics of oily wastewater treatment process, and combining with years of practical management experience, A oilfield has optimized the industrial wastewater pretreatment process. Optimize the process flow according to the actual development and production. This study ensures the development effect of the oilfield. It lays the foundation for further reducing the investment and operation cost of sewage station renovation. At the same time, it is great significance to study and optimize the pretreatment process of industrial sewage in oil field.
Application of Microseismic Monitoring in Fracturing Process Evaluation
Authors: Huang Qijun , Guo Delong , Sui Guojie , Xiao Qian , Liu Youming , He Ping 
Published: November 2024

Abstract
Fracture-mesh control technologies, such as modified liquid system (controlled fracture technology), pulse fracturing reform and directional perforation technology, have been adopted in the large-scale fracturing process of well Qaiping 1 in Qaidam Basin. However, whether the technology has achieved the predetermined goal needs to be verified. In order to fully grasp the fracture morphology in each stage of fracturing construction, the underground microseismic fracture monitoring technology is used to reveal the fracture length, height, width, orientation and spatial distribution characteristics. Based on the analysis of monitoring results, the following conclusions are obtained. (1) The collection of microseismic event data plays a key role in interpreting the properties of fractures, so as to more accurately understand and predict the formation and development of fractures. (2) Real-time microseismic monitoring reveals the application value of a variety of special processes in the formation reconstruction effect, and the transformation of liquid system (controlled fracture process), pulse fracturing and directional perforating process have significant effects on fracture morphology.
Study on Temporary Plugging Agents and Process Simulation for Offshore Low-permeability Reservoirs Fracturing
Authors: Wang Yubin , Mu Huan , Liu Jian , Sun Baojiang , Deng Junyu , Hao Zhiwei 
Published: November 2024

Abstract
Temporary plugging fracturing technology is an effective method for extending the range of segmented fracturing in horizontal wells and improving the utilization between fractures in low-permeability reservoirs. In this study, a controllable degradable temporary plugging agent was synthesized by graft copolymerization of PGA and PLA with a material ratio of 3:1, under the catalysis of stannous octoate at 150°C. This approach allows for controlled degradation of the temporary plugging materials by protecting PLA, which has good affinity to water, and adjusting the molecular weight of the product. It reduces the initial degradation rate while increasing the later degradation rate. To consider the heterogeneity of natural fractures and reservoir physical permeability in shallow sea reservoirs, a numerical model for temporary plugging and fracturing of horizontal wells was developed. The model investigates the influence of parameters such as displacement and cluster spacing on crack propagation, resulting in the formation of a simulation method suitable for temporary plugging fracturing of horizontal wells in heterogeneous reservoirs. The research findings indicate that crack length and width gradually increase with the increase of displacement. The maximum crack spread area is achieved at a displacement of 5~8m3/min. Temporary plugging can be implemented when the cluster spacing is ≤12m, allowing for the full expansion of cracks that have not effectively expanded. The largest crack spread area is observed at a crack spacing of 5~8m.
Experimental Study on the Treatment of Produced Water from Carbon Dioxide Drive by Aeration Method
Authors: Wang Ying 
Published: November 2024

Abstract
To further explore the effective development of produced water treatment technologies suitable for low to ultra-low permeability oil fields, and to clarify the water quality characteristics of produced water from CO2 flooding. A study was conducted on the basic water quality characteristics of produced water from low to ultra-low permeability oil fields. Indoor CO2 gas removal experiments were conducted using the aeration method under 40°C atmospheric pressure conditions. The research results indicate that the CO2 content in the extracted water is one of the important influencing factors for the changes in characteristic parameters such as water pH, mineralization, and corrosion rate; Under the condition of 40°C atmospheric pressure test, the aeration method has a significant treatment effect on the produced water from CO2 flooding, which can effectively remove 70% of the CO2 in the water, thereby improving the pH of the water to 8, and effectively inhibiting the corrosion rate of the produced water below 0.076mm/a.
Feasibility Theory and Practice of CO2-EOR in High CO2-Content Near-saturated Edge-bottom Water Reservoir
Authors: Sun Jiangfei , Liu Tongjing , Zhang Yanan , Li Yuntao 
Published: November 2024

Abstract
CO2-EOR technology for low-permeability tight oil and gas reservoir is in the ascendant, and CO2-EOR technology for old oilfields has not been paid enough attention, but the implementation scale has great potential, and the expected effect and implementation conditions are good. The feasibility of CO2-EOR technology in the ultra-high water cut stage of high CO2 content, near saturation pressure and edge-bottom water reservoir was studied theoretically, and the field implementation effect was tracked and evaluated. Via petrophysics, reservoir engineering, and site case analysis, a relatively comprehensive reservoir numerical model was developed, clarifying the impact of periodic gas injection volume, gas injection rate, soak time and liquid production rate on the production effect of CO2 huff and puff were clarified. The key injection-production parameters of CO2 huff and puff test wells were designed, and the feasibility study progress of CO2-EOR in near-saturated edge-bottom water reservoirs with high CO2 content was summarized. The theoretical research shows that the change rules of gas-water dual-drive, CO2 water control and oil increase in the process of CO2 huff and puff in high CO2 near-saturated edge and bottom water reservoirs, and reveals the synergistic mechanism of CO2 huff and puff to suppress water and increase energy. The tracking evaluation shows that the sweep condition of CO2 after huff and puff in the test well is complex, the storage ratio is in the range of 40%-70%, the stage oil increase is in the range of 700t-3000t, and the optimized oil increase and oil change rate can reach 2.7t/t. Based on the comprehensive theory and practice, it is considered that CO2-EOR has good potential for high CO2 near-saturated edge and bottom water reservoirs under fine control. This study has guiding and reference significance for CO2-EOR technology and application in similar oilfields at home and abroad.
Experimental Evaluation of Energy Enhancement and Fracturing Fluid Flowback Effect for CO2 Pre-Fracturing in Shale Reservoirs
Authors: Lv Yuanjia , Luo Mingliang , Zhang Mian , Wang Kai , Zhan Yongping , Zhang Shuanghuan , Zhao Chunguang 
Published: November 2024

Abstract
Liquid CO2 pre-fracturing is a promising reservoir stimulation technology due to its advantages of increasing reservoir energy, low reservoir damage, and high fracturing fluid flowback rate. The on-site flowback scheme currently relies mainly on experience and requires further optimization of the energy enhancement effect and the flowback system. This paper presented a study on the changing law of liquid CO2 pre-fracturing energy-enhancing effect and fracturing fluid flowback rate in shale reservoirs was carried out by applying the experiments of drive-off and pressure-reducing flowback. The results indicate that, the injection of CO2 followed by linear gel fracturing fluid increased the energy (pressure) of the core system by approximately 322.8% compared to the injection mode of CO2 fracturing alone, and increased the energy (pressure) of the core system by approximately 24.1% compared to the injection mode of linear gel fracturing fluid. The energizing effect of the core system showed a trend of increasing and then decreasing with the increase of CO2 injection, and the best effect was achieved when the injection ratio of linear gel fracturing fluid to CO2 was 1:1. The flowback rate of the fracturing fluid and oil recovery both increased as the flowback differential pressure increased. Extending the soak time can increase the oil recovery, but the increase gradually decreases with the extension of the soak time. Additionally, the increase in soak time can improve the flowback rate of the core with relatively high permeability, but it has little effect on the flowback rate of the core with very low permeability.
Exploration and Practice of Synergistic and Efficient Development Technology for Gas-Capped Condensate Gas Reservoirs and Oil Rings
Authors: Zhang Youyin , Yi Chuanjun , Hu Zongfang , Zheng Qiang , Wang Miaomiao , Ye Yong 
Published: November 2024

Abstract
The oil-ringed condensate gas reservoir is one of the more unique and complex types of oil and gas reservoirs. The stable oil and gas interface is crucial for the efficient development of such reservoirs, and the fundamental means of addressing the issue lies in maintaining the dynamic balance between the gas cap and the oil ring. In this paper, we address issues such as the rapid decline in oil ring production, gas cap breakthrough, and increased condensate oil loss exposed during the development of the R carbonate reservoir in the Caspian Sea Basin of Kazakhstan. Using reservoir engineering and numerical simulation methods, we optimized synergistic development ideas and the boundaries of exploitation policies for gas-capped condensate gas reservoirs and oil rings. We formulated reasonable development parameters such as extraction rate, injection-production ratio, barrier water injection ratio, and proposed dynamic control standards for zoning and classification. After implementing the plan, the gas-oil ratio of the oil ring significantly decreased, with a reduction rate of 12 percentage points. The gas production per unit pressure drop increased by 40%. The annual decline rate of condensate oil decreased from 23.6% to 13.8%. All development indicators exhibited characteristics of benign development, providing a theoretical foundation and technical methods for guiding the efficient development of similar oil and gas reservoirs.
Research on Ultrasonic Guided Wave Pipeline Defect Detection Method Based on Modal Analysis
Authors: Liu Wencai , Cai Weijiang , Kang Le , Fang Yufeng 
Published: November 2024

Abstract
Pipelines are important transmission media in the petroleum industry, and their safe and stable operation is of great significance to industrial safety. The secure and reliable operation of oil and gas pipelines holds paramount importance for industrial safety. The significance of non-destructive testing (NDT) technology in this context is steadily growing. Presently, guided wave-based pipeline defect detection technology has garnered considerable attention. This method is noteworthy for its extensive coverage, ability to inspect the entire cross-section, and its capability to conduct inspections without disrupting ongoing production processes. Research focused on the displacement distribution of various modes of guided waves, exploring different excitation methods for each mode. The investigation also delved into the interaction mechanism between guided waves and pipeline defects; Conducted research on the detection of axial, circumferential and radial dimensions of defects using different modes of guided waves, and carried out experimental verification, studying the transformation law of the reflection coefficient of the defect reflection echo when the flaw size changes provide a reference for pipeline defect detection based on guided waves.
Pipeline defect detection system based on phased array excitation technology
Authors: Gong Yanshuang , Liu Wencai , Liu Nan , Tan Chuanjiang , Tong Gen 
Published: November 2024

Abstract
To address the challenges of non-destructive testing of professional industrial pipeline conditions, this paper designs a pipeline defect detection system based on phased array excitation technology. Online/offline detection equipment can be selected according to different application scenarios, achieving various functions such as phase delay calculation, ultrasonic data collection, and graphical display of calculation results. This article mainly elaborates on the principle of phased array excitation technology, the circuit design of detection equipment, and the overall design of upper computer software, proposing a practical solution for non-destructive testing of industrial pipelines.
Research and Practice of Sand Control Completion Technology Optimization in Western H Oilfield
Authors: Song Rulin , Zhu Yingbin , Yan Guofeng , Peng Libin , Peng Yuankui , Pu Shijie , Song Yangrong , Li Fan 
Published: November 2024

Abstract
In view of the problems of poor reservoir physical properties, high clay content, loose cementation, shallow burial, low compaction degree, low temperature in the middle and deep oil layers during the development process of unconsolidated sandstone reservoirs in the western H oilfield, the original sand control technology has poor adaptability and short sand control validity period., this paper carried out research on the optimization of sand control completion technology. In the study, a series of optimization studies were conducted, including analysis of acoustic time difference in sand producing layers, simulation of sand control formation compaction, optimization of gravel filling particle size, and sand control tools. A high-strength artificial wellbore and cyclic gravel filling sand control completion process suitable for different sand producing well conditions were developed and applied in practice. The research results and on-site practice indicate that the high-strength artificial wellbore sand control completion technology has good adaptability in low-temperature and long wellbore sand production wells; The cyclic gravel filling sand control completion technology has the advantages of simple construction, low cost, and low probability of major repairs in conventional shallow sand producing wells; The complementary advantages of the two processes effectively solve the problem of sand damage in H oilfield. Since 2021, the optimized sand control completion technology has been applied 46 times in H oilfield, with an average recovery oil production of 3.4t per well and an average effective period of over 500 days for sand control. The overall input-output ratio is 1:2.8, achieving good benefits and having high promotion and application value.
Research and Tests on the Technology of Releasing and Fishing Stuck Throttles Under Pressure
Authors: Wang Sifan 
Published: November 2024

Abstract
In order to solve the problem of gas well shutdown caused by fishing failure due to stuck throttles, and to avoid situations such as the inability to lift the pipe string and high cost of handling stuck throttles, the basic structures of the slip-type throttles were analyzed. And based on the actual situation on site, it was determined that the deformation of the slip mechanism was the main cause of the throttles getting stuck. And combined with conventional bridge plug drilling and grinding, coiled tubing fishing, and steel wire fishing techniques, the technology of grinding and milling under pressure to release and fishing stuck throttles was studied. Theoretical analysis has been conducted on the feasibility of using coiled tubing mill to break the slip mechanism of the stuck throttles, including mill torque, construction displacement, drilling pressure, etc. At the same time, the technical principle and operation process of gas lift fishing throttles were introduced. Two three-packer string wells were successfully tested in the field. After the stuck throttles were milled and unblocked by the coiled tubing, the stuck throttles of Φ73.0 mm tubing were successfully salvaged, one of which was fished by gas lift. The average construction time is less than 2.5 days. The research results show that the technology of grinding and milling with pressure to release and fishing stuck throttles is safe and efficient, providing a new technical means for dealing with stuck throttles and has good promotion and application value.
Research on Factors Influencing the Production of Deep Shale Gas Wells in Weiyuan Block : A Case Study of X Well on Platform A
Authors: Liu Ji , Li Changmian , Wang Tao , Song Lixin , Lv Shiquan , Zhang Tingshuai 
Published: November 2024

Abstract
The practice of Weiyuan deep shale gas development shows that there are many factors that affect the gas production, resulting in significant differences in gas production between wells in the same region and on the same platform. In response to the phenomenon of low gas production, low wellhead pressure, and high flowback rate in Well X on Platform A, using data from drilling, fracturing, and gas production profile testing, this study examines the impact of geological and engineering factors on gas well production through gray correlation analysis and geological engineering integrated numerical simulation methods. The results show that: ① The production of adjacent wells reduces the formation energy, resulting in a large pressure drop rate after the pump is stopped in the corresponding fracturing section of the well, poor fracturing effect and low gas production contribution; ② The order of the influence of geological factors on the gas production rate of each section is: gas content > Si content > Al content > GR value> Ca content;③The segment with natural fractures and faults contributes significantly to gas production, but its long-term effectiveness needs further evaluation. This study will provide useful references for target location optimization, fracturing design optimization, and overall development deployment of deep shale gas horizontal wells in Weiyuan.
Study on the Shear Degradation Law of Polymer Drag Reducing Agents
Authors: Lv Shiyi , Li Chuanxian , Li Xinyuan , Lu Wang , Zhang Wu , Yao Bo , Sun Guangyu , Yang Fei 
Published: November 2024

Abstract
The use of drag reducing agents in oil pipeline transportation can reduce driving energy consumption and has certain energy-saving benefits. However, irreversible degradation occurs when polymer drag reducing agents are sheared through pumping. In order to study the viscosity loss of polymer drag reducing agents caused by mechanical shear during the pumping process, the combination of methods such as a rotational rheometer and an indoor drag reducing loop testing system was used to test and analyze the rheological and drag reducing properties of the drag reducing agent solution, and to study the shear degradation law of polymer drag reducing agent solution under different conditions. The results showed that the shear stress of the polymer drag reducing agent solution increased with the increase in shear rate, and the viscosity increased with the increase of shear stress, showing shear thickening. When the polymer drag reducing agent solution is not sheared, the drag reduction rate increases and then decreases with the increase of concentration, and reaches the maximum value at 20 mg·L−1. However, after shear, the drag reduction performance decreases rapidly, but the high concentration still maintains a good drag reduction rate. The research results provide a theoretical basis for improving the performance of polymer drag reducing agents under different operating conditions and play a guiding role in further improving and perfecting the polymer drag reducing technology.