bluuebunny/crossref_metadata_2025_split huggingface dataset:
The application of PVC hollow fiber ultrafiltration membrane in ultra-low permeability oilfield
Authors: Li Ying 
Published: November 2024

Abstract
Oil containing wastewater produced from ultra-low permeability oil fields generally needs to be treated to meet the 5-1-1 standard before it can be reinjected. In order to meet the standards for treating oily wastewater in ultra-low permeability oil fields, PVC hollow fiber ultrafiltration membranes and pre-treatment processes for removing oil, suspended solids, sulfides, etc. before the membrane were selected. The application shows that the aeration air flotation flow sand filtration PVC hollow fiber ultrafiltration membrane process can treat oily wastewater, and the treated water can reach the “5-1-1” standard. In the pre-treatment process of PVC hollow fiber ultrafiltration membrane, the silicone rubber membrane aeration device has good oxidation effect, high efficiency in micro nano air flotation for oil removal and suspended solids, and easy management of sand flow filters. This process has economic feasibility and provides technical support for the treatment of oily wastewater in ultra-low permeability oil fields, with great promotional value.
Practice and Exploration of Ground Engineering for Pilot Testing of Offshore Gas Storage Facilities
Authors: Fan Jiaxi , Hao Dayong , Li Min , Wu Yingli , Wang Yong , Hu Caiyun 
Published: November 2024

Abstract
The N gas storage facility is an offshore gas storage facility for oil reservoir reconstruction. There is no successful experience to learn from in the construction and operation of surface engineering. Therefore, a pilot experiment centered on economic benefits and fully utilizing the existing facilities in the oilfield has been carried out. Unlike traditional underground gas storage facilities, the construction difficulties of offshore gas storage facilities are more prominent. By strengthening design management, procurement management, construction management, testing management, and HSE management, the construction of gas storage facilities is efficiently promoted and successfully put into operation, achieving the experimental goal. In the construction and operation practice, facing many difficulties such as the evaluation and governance of old systems, inconvenient maritime transportation, long procurement cycle of compressors, and unsuitable production and operation, we have explored management methods such as utilizing old and leasing compressors, reasonable coordination of sea transportation, and adjustment of production parameters. We have innovated technologies such as soaking cleaning+steel wire ball unblocking and cleaning, small pipe capacity short distance series injection, and rapid construction of gas lift liquid discharge warehouses, Provide reference significance for the construction of similar gas storage facilities.
Research and Experiment on Efficient Fracturing Technology of Tight Gas in Qaidam Basin
Authors: Feng Xinyuan , Liu Yong , Liu Huan , Fu Ying , Xiao Qian , Qiao Xingyu 
Published: November 2024

Abstract
The lithology of the Huangguamao block reservoir in the Qaidam Basin is complex and dense. The difference between gas and water is not obvious. The gas reservoir has the characteristics of low porosity, low permeability, low saturation, and coexistence of gas and water. The problem of water output after fracturing and short stable production period has put forward higher requirements for improving production and efficiency in tight gas horizontal wells. Based on successful cases of tight gas reservoir fracturing both domestically and internationally, as well as the experience of unconventional reservoir volume transformation in the Qaidam Basin, this study conducts a historical analysis of reservoir characteristics and measures transformation in the Huangguamao block, evaluates the difficulties of measures transformation, optimizes the formation of two process ideas: high viscosity liquid controlled sand lifting fracturing and reverse composite fracture network fracturing, and prepares fracturing programme for MP2 and MP3 wells. After on-site fracturing, two processes were evaluated and analyzed, and the results showed that the reverse composite fracturing process, which takes into account both crack length and complexity, can effectively increase the transformation volume, provide more sufficient formation energy, increase production, and have stronger adaptability.
Research on Perforation-Adding Tapping Strategies for Perforation-avoided Production Wells of Block A in Daqing Oilfield
Authors: Qin Yong 
Published: November 2024

Abstract
To avoid inefficient and ineffective circulation and improve the producing degree of low water-cut layers, ultra-high water-cut layers of new wells were not perforated before putting into production. In order to fully tap remaining oil in perforation-avoided layers, this paper studied on perforation-adding tapping strategies for perforation-avoided production wells of block A in Daqing oilfield according to dynamic and static characteristics of injection and production wells, logging curves and numerical simulation. The research results show that the whole layer and the top of the layer without perforation are preferred to selected to add perforation. Injection parameters optimization, separate-layer adjustment and hydraulic fracturing can slow down the decline of injection and production capacity. Meanwhile, plane adjustment in perforation-adding area can further improve the development effect. Based on perforation-adding effect and numerical model prediction results, the optimal perforation-adding time of classified wells is different. The best perforation-adding effect of wells with class I and class II channels perforating avoided was achieved in the middle and late water cut rising period while achieved in the middle and late low water-cut stage in wells with class III and class IV channels perforating avoided.
Two-Dimensional Physical Model Experimental Study on Sweep Efficiency of Offshore Heavy Oil Hot Water Flooding
Authors: Liu Dong , Cai Hui , Chen Jianbo , Tian Cong , Liao Hui 
Published: November 2024

Abstract
The conventional water flooding approach for the development of ordinary heavy oil faces challenges such as high injection-production mobility, rapid increase in water cut, and low final recovery. By using the temperature-sensitive properties of heavy oil, the viscosity can be effectively reduced, and the flow capacity within porous media can be enhanced by increasing the temperature of injected water. Onshore hot water flooding is primarily used to exploit the remaining oil potential during the later stages of steam stimulation, while offshore is used to enhance efficiency during the mid to late stages of water flooding. The key to the success of hot water flooding technology lies in the improvement of the sweep coefficient. Firstly, a two-dimensional physical experiment model is designed in accordance with the geological and reservoir characteristics of the target oilfield, based on the principle of similarity. Secondly, parameters that quantitatively characterize the development law of the plane temperature field, such as the effective sweep coefficient, regular factor, and plane expansion speed of the high-temperature region, are studied. Then, through two-dimensional experiments, the effects of injection medium, formation rhythm, and timing of hot water injection on sweep efficiency and temperature field development were discussed. Finally, on the basis of two-dimensional experiments, the effects of heat injection temperature, timing of heat injection, hot water injection speed, and high permeability strip on the improvement of sweep efficiency were quantitatively analyzed by numerical simulation. The results show that compared with hot water flooding, hot water composite flooding can increase the effective sweep coefficient from 15.05 % to 28.71 %. The anti-rhythm is helpful to the upward expansion of the high temperature zone, which can increase the oil displacement efficiency by 1.5 %. Water channeling can be effectively controlled by injecting hot water with low water cut. The increase of heat injection temperature is helpful to increase the proportion of high temperature heating area. The higher the injection speed, the greater the expansion speed of the heating chamber. The research results provide a direction for the development of heavy oil conventional water flooding to improve oil recovery in offshore heavy oil.
Research on Production Behavior of A Fractured Well in Gas Hydrate Reservoirs Considering Multilayer
Authors: Dang Chenyue , Li Xuan , Li Honghong , Zhang Yaohui , Fu Jiyou , Nie Shuaishuai 
Published: November 2024

Abstract
Natural gas hydrates are internationally recognized as a new clean energy source with high prospects for commercial development. However, the vast majority of hydrates are hosted in oceanic clayey silty sediments, which are inefficient to exploit due to the extremely low effective permeability. In this paper, a novel development mode, that is, multilayer commingled production with a hydraulically fractured well, is proposed for the multilayered reservoir where hydrate and free gas coexist, to enhance productivity. Especially, the co-production behavior was numerically investigated, with the multilayered reservoir containing a hydrate-bearing layer, a three-phase layer, and a free gas layer located in the Shenhu Area as the geological background. The results indicated that the fracture provided flow channels for gas production in the multilayer, as well as greatly increasing the pressure drop spreading zone and changing the hydrate decomposition mode from around the wellbore to along the fracture surface. Compared with improving the fracture conductivity, increasing the fracture length is more effective for improving hydrate decomposition efficiency and co-production capacity. Specifically, when the fracture half-length was 30 m and the fracture conductivity was 100 D·cm, the cumulative gas production reached 949×104 m3 at 3600 days, which was 3.28 times that of the unfractured scenario. Additionally, fracturing the free gas layer hardly affects productivity as the free gas can be well-recovered by the wellbore. Overall, the proposed mode is promising for multilayered gas hydrate reservoirs, provides references for the co-production plan design, and contributes to the scale mining of hydrates.
Research and Application of Deformation Detection Technology for Vertical Storage Tanks Based on Three-dimensional Laser Scanning
Authors: Wang Yangchao , Liu WenCai 
Published: November 2024

Abstract
Vertical storage tank is one of the most important storage equipment in the petroleum industry, which is widely used in the petroleum and petrochemical industry. Once a deformation accident occurs in a vertical storage tank, it will generate extremely high danger and cause great harm effects. Therefore, foreign experts have been focusing on research on deformation detection of vertical storage tanks. In this paper, Vertical storage tanks are subjected to deformation assessment using 3D laser scanning technology, which focuses on solving the problem of missing point cloud repair in the application of three-dimensional laser scanning. Our research represents a BP neural network point cloud repair calculation method based on interpolation, which is based on the conventional interpolation method for horizontal point cloud repair. Compared with interpolation method, the BP neural network point cloud repair calculation method based on interpolation method has faster speed and higher accuracy. These findings provide essential technical support for further research on vertical tank deformation detection technology which based on three-dimensional laser scanning in the future.
Application of Seismic Sedimentology in Identifying Submarine Fan Bodies
Authors: Li Yanjie , Chen Xuehai , Qiao Wei , Liu Yang , Peng Jianliang , Zhang Xiangjuan , Fan Zhang , Xu Lixian , Zhang Fan 
Published: November 2024

Abstract
The research area is located in the Yenisai Hatanga Basin of Russia, which is a transitional facies sedimentary rock between sea and land. Oil and gas are mostly concentrated in turbidite sand bodies of the low level domain submarine fans of Lower hutt formation in the Lower Cretaceous, and locally developed in the slope fan sand bodies of the high postion domain. which is good oil and gas reservoir, however, due to limitations of geological research conditions and data, the sedimentary characteristics and planar distribution of the submarine fan sand bodies are not clear in research area. This article conducts research on the identification and plane distribution prediction of submarine fan bodies using seismic sedimentology methods, By combining sequence stratigraphy, seismic profile, and RGB fusion technology, the sand bodies of submarine fans are analyzed. Through the correlation analysis of seismic profiles and seismic facies, corresponding relationship between sedimentary microfacies and typical seismic wave patterns is established. The study shows that the study area mainly develops continental shelf slope facies, submarine fans, and shallow to semi deep marine facies. Sediments formed a turbidite submarine fan composed of sandstone siltstone mudstone in the ancient trough. There are 5 sand groups developed in the Hutt Formation under the main target layer in the study area. Among them, the IV oil group is the main oil-bearing layer. The 0, Ⅰ, and Ⅱ sand groups have limited distribution and poor sand body connectivity. The Ⅲ sand group is mainly developed in the study area. In the north, it is distributed in the middle of the study area on the plane. The IV sand group is widely developed and distributed in the middle of the study area on the plane. Seismic sedimentology can provide technical support for prediction research of reservoirs.
Application of Supervised Pattern Fault Identification Technology In Y Reservoir
Authors: Wei Luo , Bo Zhao , Ning Yin , Xiaochuan Yang , Jun Zhu , Yongshou Zhang 
Published: November 2024

Abstract
The Y reservoir in the Tarim Basin is a fault-controlled buried hill reservoir. Affected by factors such as deep embedding depth and high degree of stratum fragmentation, the signal-to-noise ratio of is low and the imaging effect of faults is poor. Therefore, it is very difficult to identify faults accurately. The conventional geometric attribute plane is extremely messy, the interference information is serious, and the fault information is difficult to be effectively identified, which cannot solve the problem of fine identification of buried hill reservoir faults. Aiming at the demand of fault characterization in reservoir area, combined with the artificial intelligence analysis method of big data, a fault identification technology under supervised pattern is proposed. Firstly, through cascade denoising and fault space imaging enhancement processing, the signal-to-noise ratio of seismic data and the fault imaging effect is improved. Secondly, the fault types are divided according to the discontinuous characteristics of the seismic axis, and different types of faults are characterized by multi-type sensitive attributes. Finally, the training samples are established according to the fault type. Through the iterative constraint training method, the fault identification work under the supervised pattern is carried out, and the fine characterization of different types of faults in Y reservoir is completed. Relying on the artificial intelligence big data analysis method, this technology has the innovation of full-type fault information utilization and supervised constraint training, which plays an important guiding role in the fine identification of faults in low signal-to-noise ratio areas.
Study on reservoir heterogeneity of Chang 8 reservoir in Hongde Oilfield, western margin of Ordos Basin and knowledge of fine stratification development practice
Authors: Yang Chen , Wang xiqiang , Li Ling , chun Zhaohu 
Published: November 2024

Abstract
In view of the problems of reservoir heterogeneity and unclear understanding of main control factors in Chang8 reservoir of Hongde Oilfield in the middle part of Tianhuan, Ordos Basin, efficient development and stable production are restricted by a large number of drilling, core data and log comparative analysis, using core observation, microscopic rock slice identification, scanning electron microscopy, mercury injection and phase infiltration experiments, etc. Based on the understanding of sedimentary facies and diagenesis, the quantitative analysis of Chang 8 in the study area is carried out from the macro intra-layer, interlayer, plane heterogeneity and microscopic heterogeneity. Finally, it is concluded that Chang 8 reservoir in Hongde Oilfield presents strong heterogeneity, and sedimentary microfacies, different clastic components of sandstone, diagenesis and other main factors affecting its strong heterogeneity. At the same time, in the development practice of De 5 area of Hongde Oilfield, the multi-stage sedimentary cycle division and step production and development were taken as a breakthrough, and the differential reservoir seepage theory was innovatively used to reduce the section/plane contradiction caused by reservoir heterogeneity, and a technical system such as regional fine stratified production, differentiated reservoir fracturing and reconstruction, single sand body fine injection and production control and stratified water injection was formed. The high efficiency development and utilization of strong heterogeneous reservoir is realized.
Determination of Fracturing Risk-Units base on seismic and micro-seismic
Authors: Jin Qi-hu , Yu Xue-meng , Liang Xue-li , He Hui , Xu Gang , Yao Zheng-xin 
Published: November 2024

Abstract
During hydraulic fracturing, unconventional oil and gas reservoirs often encounter risks, such as fracturing casing deformation, which affects the efficiency and effectiveness of fracturing. We can accurately identify the location of fracturing risks by using logging data and seismic data. However, we cannot avoid the occurrence of risks, and the location of deformation may be in the un-fractured stage, which is relatively far from the already fractured stage. In severe cases, it is necessary to merge or discard the un-fractured stage of the casing deformation, which will inevitably affect the fracturing effect and production. Therefore, it is particularly important to effectively divide risk units, optimize the sequence of fracturing in the stage, and reduce the impact of risk occurrence. In order to reduce the impact, the author proposes a method to determine risk-units. Firstly, before hydraulic fracturing, seismic data is used to interpret faults and determine risk-units based on the connectivity of faults. Then, during hydraulic fracturing, micro-seismic events are applied to explain artificial faults, optimize the connectivity of faults, and determine risk-units. Finally, based on the risk-units, determine the sequence of fracturing, the stage within the same risk-units should be subjected to hydraulic fracturing as the same batch, after all stages within the same risk-units are fractured, the stages of next risk-units can be carried out. The method proposed by this paper has been applied in zipper fracturing, which can effectively reduce the impact of casing deformation. After the application of this method, the deformation only occurs in the fractured stage or near the un-fractured stage, thus significantly reducing the impact on the un-fractured stage. However, due to the complexity of geological structure and stress transmission, the stages may also have mutual influence, located within different risk-units. Therefore, how to optimize the sequence of fracturing based on risk-units is a topic that needs further-deepening research. This paper innovatively proposes a method for determining fracturing risk-units based on seismic and micro-seismic data to optimize the sequence of fracturing in zipper fracturing, this is of great significance for improving fracturing efficiency, improving fracturing effectiveness, and increasing single well oil and gas production.
Optimization of Velocity String Drainage and Gas Recovery Process for Sour Gas Wells in Jingbian Gas Field
Authors: Gao Wei , Liu Yang , Liu Liping , Miao Muyang , Chen Hu , Gong Xiaoliang 
Published: November 2024

Abstract
In view of the gradual attenuation of gas well energy during the development of Jingbian gas field, the liquid carrying effect of some gas wells with small gas production becomes worse, the drainage effect of 60 % gas wells is not ideal, and the H2S content of the lower paleo-sulfur gas wells is high, the salinity is high, there is a certain corrosion, and most of the drainage measures cannot be implemented. The optimization of sulfur-resistant velocity string was carried out from the aspects of velocity string size and pipe material, and the appropriate pipe diameter and pipe material were selected. A new type of broken disc speed string plug was developed, which successfully solved the problem that the existing plug could not be broken or returned after construction. The field application results show that compared with the 27/8 “ string, the liquid carrying flow rate is reduced by 82 %. After 2.5 years of service, the anti-corrosion performance of the pipe is good. The cumulative increase of the well is 445.4 thousand cubic meters, and the effective rate of the measures is 97.45 %. The stable and continuous liquid carrying of the gas well is realized, which has a good application effect. It has certain reference significance for the implementation of the drainage gas recovery technology of the velocity string in the lower ancient sulfur gas well.
A New Productivity Prediction Model for Multi-fractured Horizontal Wells in Tight Oil Reservoirs
Authors: Gang Rui , Gao Han , Li Bo , Zhang Ming , Lv Weiyuan , Tao Liang , Li Lingduo 
Published: November 2024

Abstract
The productivity of Multi-fractured horizontal wells (MFHWs) in the tight oil reservoirs is the key index to evaluate the effect of volume fracturing. In this study, to find a solution for this problem, firstly, the big data affecting the productivity of MFHWs were collected, and then a multi-level evaluation system was built by using the analytic hierarchy process(AHP). Secondly, the gray theory was used to calculate the correlation coefficients between different parameters and production capacity to screen out the key parameters affecting the production capacity. Finally, a new horizontal well productivity prediction model by coupling key geological and engineering parameters was established, to calculate the similarity coefficient and realize quantitative prediction of single well productivity. The results show that the length of horizontal section, formation pressure, fracturing fluid volume, number of stages, net pay thickness and permeability are the key parameters affecting productivity of MFHWs. The new productivity prediction model has been successfully applied to 175 wells in China’s typical tight oil fields, with prediction errors less than 5%. It can be used in productivity prediction of horizontal wells after volume fracturing in similar unconventional tight oil reservoirs, has broad application prospects, and can guide the efficient development of and fracturing scheme selection for tight oil reservoirs effectively.