Natural Gas Industry B最新文献

{"title":"Development simulation in Gucheng County, Hebei Province: Comparative study of the thermal storage development of clastic and carbonate rocks","authors":"Xiaohong Liu ,&nbsp;Jinxia Liu ,&nbsp;Zhaoqing Ma ,&nbsp;Yuxing Wang ,&nbsp;Hui Zhang","doi":"10.1016/j.ngib.2024.01.004","DOIUrl":"10.1016/j.ngib.2024.01.004","url":null,"abstract":"<div><p>There are two sets of thermal reservoirs with different rock types in the Gucheng geothermal field of Hebei Province, namely the Ordovician fractured carbonate thermal reservoir and the Neogene Guantao sandstone thermal reservoir, each developed using independent well networks. The energy demand per unit area in the region is high, and the existing geothermal development methods cannot meet the regional energy demand. For this type of block, combined with the development characteristics of different types of thermal reservoirs, numerical simulation methods were used to study the geothermal development trends of Ordovician fractured carbonate reservoirs and Neogene Guantao Formation sandstone reservoirs. When simulating sandstone thermal storage, priority should be given to demonstrating the optimal recharge flow rate, while in simulating carbonate thermal storage, the focus should be on considering the influence of fracture development direction on development trends. Through numerical simulation of thermal storage development and combined with well network design, the optimal well spacing, production reinjection flow rate, and reinjection temperature for two sets of thermal reservoirs developed using the same well network were determined. It is predicted that the average heat flow in the study can increase by 47.8 %. This study presents reasonable development technical countermeasures to maximize the heating capacity of the geothermal development zone and provides an effective reference for the efficient development of similar geothermal resources in the Bohai Bay Basin.</p></div>","PeriodicalId":37116,"journal":{"name":"Natural Gas Industry B","volume":"11 1","pages":"Pages 95-105"},"PeriodicalIF":3.3,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2352854024000044/pdfft?md5=c38a2dfa883b55059b45046a50d25799&pid=1-s2.0-S2352854024000044-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139813216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Application of wide-field electromagnetic method for favorable target optimization in the Heishan granite geothermal area of Yunnan Province","authors":"Jie Li ,&nbsp;Honghu Zeng ,&nbsp;Xiaoyong Lu ,&nbsp;Chao Xu ,&nbsp;Jingrui Chen","doi":"10.1016/j.ngib.2024.01.006","DOIUrl":"10.1016/j.ngib.2024.01.006","url":null,"abstract":"<div><p>The Heishan geothermal area is positioned above the sole Yunnan–Tibet high-temperature geothermal belt, where huge geothermal energy resources are available. Utilizing the characteristics of large exploration depth, extensive coverage, and high precision of the wide-field electromagnetic method, four survey lines were deployed, totaling 29.8 km, to enable a comprehensive analysis of the granite structure and fault distribution. The results indicate that the rocks within the area can be vertically divided into a granite basement and a fractured layer. Moreover, three different zones of resistivity were identified: the granite basement zone has a resistivity range of 2500–20000 Ω m, whereas the compressional shear zone and the secondary fault zone have a resistivity range of 750–2500 Ω m, and the extensional fault zone and the main fault zone have resistivity values below 750 Ω m. The Heishan-Hejian fault and the fault zone formed during its right-lateral strike-slip process, as well as the controlled area of the Qianmaihe fault, are all favorable targets. Of these, the Qianmahe fault possesses a larger-scale heat-conducting and water-controlling structure. In addition, in the secondary fault-controlled area extending to the west, the zone between F2’ and F4 exhibits renewed tectonic activity, suggesting a greater potential for geothermal resources.</p></div>","PeriodicalId":37116,"journal":{"name":"Natural Gas Industry B","volume":"11 1","pages":"Pages 74-82"},"PeriodicalIF":3.3,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2352854024000056/pdfft?md5=75685d49691e3f235c736f3445efaa99&pid=1-s2.0-S2352854024000056-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139831802","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of a wide field electromagnetic method for deep geothermal factors in Sanying Basin, western Yunnan, China","authors":"Hui Tan ,&nbsp;Diquan Li ,&nbsp;Xinyu Qin ,&nbsp;Xiaoyong Lu ,&nbsp;Jie Li","doi":"10.1016/j.ngib.2024.01.008","DOIUrl":"10.1016/j.ngib.2024.01.008","url":null,"abstract":"<div><p>Geothermal energy is a renewable energy with large scale and wide distribution. Geothermal resources are abundant in western Yunnan, China, but the work is less. In this study, a wide field electromagnetic method (WFEM) was applied to geothermal exploration in Sanying Basin, and six survey lines were deployed. On the basis of the inversion results, the paper conducts a progressive study on the four genetic factors of geothermal exploration, including “source, storage, channel, and circulation”. The Sanying Basin has three sets of intrusive rock masses, two kinds of lateral and vertical additional heating modes. Two sets of deep and shallow reservoir systems were identified. Two major strike-slip deep faults were identified as heat conduction channels. Two sets of water circulation systems were established, and the formation mechanism of hot springs was clarified. Anomaly 1 is a favorable target area for hydrothermal development, and invasion Ⅱ is a favorable target area for hot dry rock.</p></div>","PeriodicalId":37116,"journal":{"name":"Natural Gas Industry B","volume":"11 1","pages":"Pages 66-73"},"PeriodicalIF":3.3,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2352854024000081/pdfft?md5=ed4c9224b1081391f876c636d794c000&pid=1-s2.0-S2352854024000081-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139814915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Geothermal resource distribution and prospects for development and utilization in China","authors":"Jinchuan Zhang ,&nbsp;Lei Chen ,&nbsp;Yuhang Sun ,&nbsp;Longfei Xu ,&nbsp;Xingxu Zhao ,&nbsp;Qianchao Li ,&nbsp;Dawei Zhang","doi":"10.1016/j.ngib.2024.01.001","DOIUrl":"10.1016/j.ngib.2024.01.001","url":null,"abstract":"<div><p>China is tectonically composed of a series of plates and orogenic belts and has been influenced by the Pacific and Indian plates since the Late Paleozoic, forming a regular distribution of Mesozoic and Cenozoic granites. As an important source of geothermal energy, granite is the five elements of geothermal enrichment:geothermal sources; geothermal reservoirs; heat transmission; heat caprock; and heat preservation and it is possible to classify the types of geothermal resources in China according to their distribution in combination with neotectonic movements. China's geothermal energy can be divided into hydrothermal and hot dry rock types in basins and orogenic belts, respectively. Geothermal resources can be divided into hydrothermal, rock, magma, and hybrid geothermal types according to the heat carrier type. Basin geothermal resources are dominated by hydrothermal types, while geothermal energy in orogenic belts with granite includes both hydrothermal and hot dry rock types. Geothermal resources in China can be divided into 6 distinct geothermal regions and 13 subregions, of which the Southwest and Southeast China regions and the Qaidam-Qilian and Jiaoliao subregions in North China with Mesozoic and Cenozoic granites are the most favorable areas for high-temperature hydrothermal and hot dry rock sources. China has complex geological conditions, diverse types of geothermal resources, and broad prospects for development and utilization. Having performed extensive shallow hydrothermal geothermal development and utilization and completed various power generation tests, China's geothermal development and utilization is in a critical stage of transition from the direct utilization of shallow hydrothermal resources to high-temperature geothermal or hot dry rock power generation in middle and deep layers. Basic theoretical research, key technology breakthroughs, and policy incentives are the main issues that need to be addressed in the geothermal industry.</p></div>","PeriodicalId":37116,"journal":{"name":"Natural Gas Industry B","volume":"11 1","pages":"Pages 6-18"},"PeriodicalIF":3.3,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2352854024000019/pdfft?md5=5c979ce5f094b02fc78d89c5b5b634ab&pid=1-s2.0-S2352854024000019-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139878495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of the development potential of hot dry rock in Hainan Island","authors":"Jigao Leng ,&nbsp;Dong Lei ,&nbsp;Xiaochen Liu ,&nbsp;Fuli Sun ,&nbsp;Guiyuan Ren ,&nbsp;Lei Chen ,&nbsp;Liangyun Pan ,&nbsp;Yang Gao ,&nbsp;Yajing Zhao","doi":"10.1016/j.ngib.2024.01.007","DOIUrl":"10.1016/j.ngib.2024.01.007","url":null,"abstract":"<div><p>Hainan Island is located in the northwestern South China Sea at the boundary of two tectonic plates. Surface features and actual drilling have confirmed that there are rich geothermal resources in the area, with predicted resources of 480 million GWh. On the basis of the 1:200,000 gravity and 1:10 aeromagnetic data and constrained by the well-explored Fushan Depression and Baocheng Rock Mass, we conducted a systematic study of hot dry rocks and evaluated the development potential of the geothermal resources of the medium-depth and deep hot dry rocks in Hainan Island for the first time. The island is structurally active, with extensive granites, strong volcanic and earthquake activities, and many hot springs, indicating that the geothermal geological conditions are favorable. There are two types of hot dry rocks, sedimentary basin type and uplifted mountain type, on the island. The sedimentary basin-type hot dry rocks are mainly found in the north of the island and have an area of 2657 km², an average depth of 2480 m, and an average heat reservoir temperature of 230 °C at 6000 m depth. Uplifted mountain-type hot dry rocks with a total area of 13,000 km² mainly occur in Danzhou in the north of the island and Baocheng in the south. The heat reservoirs of these rocks are Yanshanian intrusive plutons and the average temperature is 236 °C at 6000 m depth. Nine favorable hot dry rock targets are identified, of which five are sedimentary basin types and four are uplifted mountain types. The Fushan and Eman depressions in north Hainan Island and the Baocheng Rock Mass in the south of the island are the preferred exploration targets.</p></div>","PeriodicalId":37116,"journal":{"name":"Natural Gas Industry B","volume":"11 1","pages":"Pages 19-27"},"PeriodicalIF":3.3,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S235285402400007X/pdfft?md5=117d9a9716c8882d5b45315b2cedd218&pid=1-s2.0-S235285402400007X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139881639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reinjection modeling in sandstone geothermal reservoirs: A case study of Dezhou geothermal heating demonstration project","authors":"Wentao Zhao ,&nbsp;Lianbo Liu ,&nbsp;Jie Li ,&nbsp;Zhangfeng Shi ,&nbsp;Zhongyue Cheng ,&nbsp;Tieya Jing ,&nbsp;Yulong Yin ,&nbsp;Mingyu Zhu","doi":"10.1016/j.ngib.2024.01.003","DOIUrl":"10.1016/j.ngib.2024.01.003","url":null,"abstract":"<div><p>To ensure the long-term and sustainable development and utilization of geothermal resources, the extracted geothermal water should be reinjected. Considering Guantao Formation in the Dezhou Area, the geothermal reinjection process is analyzed through experimental and numerical modeling. Numerical analysis suggests that the reinjection flow only has a strong influence on the reservoir pressure over a relatively narrow range, whereas the range over which this process has a weak influence exceeds 500 m. Assuming that the reinjection well is full, a reinjection flow rate of 50–100 m³/h can theoretically be achieved without additional pressure. Experimental modeling of geothermal exploitation and reinjection suggests that sandstone reservoirs with good porosity and permeability should be selected to lower the reinjection pressure of geothermal reservoir projects. In real geothermal reinjection processes, the reinjection flow rate should be carefully determined to prevent excessive pressure in sandstone reservoirs and ensure long-term stable and efficient reinjection. The Huaneng Geothermal Project has been operating for 2 years, and there has been no significant change in the outlet temperature and reinjection pressure of the geothermal wells. This is generally consistent with the modeling results, demonstrating the accuracy of the exploitation and reinjection modeling analysis. An efficient reinjection scheme for sandstone geothermal reservoirs is developed based on the Huaneng Dezhou Geothermal Heating Project, in which the total reinjection rate is approximately 99.1 %. Based on our experimental and numerical modeling, no significant temperature and pressure changes will happen for at least 5 years at the present exploitation and reinjection pressure and amount.</p></div>","PeriodicalId":37116,"journal":{"name":"Natural Gas Industry B","volume":"11 1","pages":"Pages 106-120"},"PeriodicalIF":3.3,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2352854024000032/pdfft?md5=017451a62c066cda6de601e516b9d914&pid=1-s2.0-S2352854024000032-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139888999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research progress on corrosion and hydrogen embrittlement in hydrogen–natural gas pipeline transportation","authors":"Hongwei Zhang ,&nbsp;Jie Zhao ,&nbsp;Jingfa Li ,&nbsp;Bo Yu ,&nbsp;Jialong Wang ,&nbsp;Ran Lyu ,&nbsp;Qian Xi","doi":"10.1016/j.ngib.2023.11.001","DOIUrl":"10.1016/j.ngib.2023.11.001","url":null,"abstract":"<div><p>Hydrogen, clean, efficient and zero-carbon, is seen as a most promising energy source. The use of existing gas pipelines for hydrogen–natural gas transportation is considered to be an effective way to achieve long-distance, large-scale, efficient, and economical hydrogen transportation. However, the pipelines for hydrogen–natural gas transportation contain lots of impurities (e.g., CH₄, high-pressure H₂, H₂S and CO₂) and free water, which will inevitably lead to corrosion and hydrogen embrittlement. This paper presents a systematic review of research and an outlook for corrosion and hydrogen embrittlement in hydrogen–natural gas pipeline transportation. The results show that gas-phase hydrogen charging is suitable for hydrogen–natural gas transportation, but this technique lacks technical standards. By contrast, the liquid-phase hydrogen charging technique is more mature but has large deviation from the engineering reality. In the hydrogen–natural gas transportation pipelines, corrosion and hydrogen embrittlement are synergetic and competitive, but the failure mechanism and change law when corrosion and hydrogen embrittlement coexist remain unclear, which need to be further clarified by experiments. The failure mechanism is believed to be mainly sensitive to three key factors, i.e., the H₂S/CO₂ partial pressure ratio, the hydrogen blending ratio, and material strength. The increase of the three factors will make the pipeline materials more corrosive and more sensitive to hydrogen embrittlement. The research findings can be used as a reference for research and development of long-distance hydrogen–natural gas transportation technology and will drive the high-quality development of the hydrogen–natural gas blending industry.</p></div>","PeriodicalId":37116,"journal":{"name":"Natural Gas Industry B","volume":"10 6","pages":"Pages 570-582"},"PeriodicalIF":3.3,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2352854023000748/pdfft?md5=ac19d26650730bde2d46270979aa436f&pid=1-s2.0-S2352854023000748-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138618398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Energy analysis of a flue gas hydrate-based desalination system with liquefied natural gas cold energy","authors":"Shicai Sun,&nbsp;Yanping Zhao,&nbsp;Linlin Gu,&nbsp;Junhao Cui,&nbsp;Lintao Sun,&nbsp;Shutong Meng","doi":"10.1016/j.ngib.2023.11.008","DOIUrl":"10.1016/j.ngib.2023.11.008","url":null,"abstract":"<div><p>A three-stage flue gas hydrate-based desalination system was designed using liquefied natural gas (LNG) cold energy. This system could increase the CO₂ amount-of-substance fraction in the flue gas from 17 % to 97 % and produce desalinated water with a desalting rate of approximately 95 %. Four system operating plans were simulated as follows: CO₂ + N₂ + seawater at 0.6 MPa, CO₂ + N₂ + seawater at 3 MPa, CO₂ + N₂ + tetra-n-butyl ammonium bromide (TBAB) + seawater at 0.6 MPa, and CO₂ + N₂ + tetrahydrofuran (THF) + seawater at 0.6 MPa. The energy consumption, LNG cold energy consumption, energy loss, and environmental friendliness were calculated and analyzed. The compression energy consumption was the highest contributor to the total energy consumption, and the highest percentage of total energy loss was heat exchange loss. Reducing the formation pressure in the first stage effectively reduced the total energy consumption, LNG cold energy consumption, and energy loss by 21.28 %, 24.41 %, and 23.99 %, respectively. Addition of TBAB/THF reduced the total energy consumption, LNG cold energy consumption, and energy loss by 18.45 %/17.88 %, 32.30 %/32.73 %, and 24.65 %/23.54 %, respectively. The CO₂ + N₂ + seawater operation at 0.6 MPa did not produce pollution. The CO₂ + N₂ + seawater operation at 3 MPa had the highest total energy consumption and LNG cold energy consumption. Operation with TBAB/THF had obvious advantages in terms of total energy consumption but suffered from the generation of pollution. Comprehensive analysis indicated that the CO₂ + N₂ + seawater operation at 0.6 MPa was the optimum system.</p></div>","PeriodicalId":37116,"journal":{"name":"Natural Gas Industry B","volume":"10 6","pages":"Pages 613-625"},"PeriodicalIF":3.3,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2352854023000815/pdfft?md5=6edfff8bbc77dfc4a0d3efc14c6eb77a&pid=1-s2.0-S2352854023000815-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138988594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A viscosity-soluble type biomimetic self-healing cement slurry system","authors":"Youzhi Zheng ,&nbsp;Chaoyi She ,&nbsp;Hongqiong Fu ,&nbsp;Xiaoyang Guo ,&nbsp;Yao Wang","doi":"10.1016/j.ngib.2023.11.004","DOIUrl":"10.1016/j.ngib.2023.11.004","url":null,"abstract":"<div><p>With the development of cementing slurry technology, cementing self-healing has become one of the most effective technologies to prevent and treat oil and gas channeling and improve long-term sealing capacity of cement sheath. To solve the technical problem of annulus oil and gas channeling caused by the long-term sealing failure of cement sheath, this paper researches and develops a kind of viscosity-soluble type biomimetic self-healing cement slurry system from the perspective of chemical biomimetics, based on the technical idea of “prevention before blocking”. Then, the engineering performance of this biomimetic self-healing cement slurry system and the mechanical property of self-healing set cement are evaluated respectively. In addition, the mechanical recovery capacity and permeability reducing rate of the self-healing set cement conserved with methane are evaluated by creating fractures through splitting. Finally, the healing mechanisms of the self-healing cement are analyzed by means of SEM microscopic test and infrared spectrography. And the following research results are obtained. First, the set cement has excellent mechanical property. When the compressive strength decreases by 15 %, the elastic modulus of set cement decreases by 41 %, showing good toughness to play the role of “first prevention”. Second, when meeting hydrocarbon, the damaged set cement is excited to generate a kind of viscosity-soluble type gelatinous ester substance, which re-bonds the skeleton of the set cement. When the self-healing set cement is conserved with methane, its compressive strength recovery rate is up to 94.5 %, bending strength recovery rate is 58.6 %, gas log permeability drops by 99 %, and liquid log permeability drops by 100 %, so as to realize “blocking later”. In conclusion, the viscosity-soluble type biomimetic self-healing cement slurry system can effectively achieve cementing integrity and long-term sealing integrity through self-healing after the damage of cement sheath, which provides a strong technical support for preventing the production safety hazard of sustained casing pressure in oil and gas wells and is beneficial to solve the technical problem of annulus oil and gas channeling caused by long-term sealing failure of cement sheath.</p></div>","PeriodicalId":37116,"journal":{"name":"Natural Gas Industry B","volume":"10 6","pages":"Pages 547-554"},"PeriodicalIF":3.3,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2352854023000773/pdfft?md5=b23952016ac51190ee787788d12096ca&pid=1-s2.0-S2352854023000773-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138623319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Progress in and research direction of key technologies for normal-pressure shale gas exploration and development","authors":"Xipeng He ,&nbsp;Guisong He ,&nbsp;Yuqiao Gao ,&nbsp;Longsheng Zhang ,&nbsp;Qing He ,&nbsp;Peixian Zhang ,&nbsp;Wei Wang ,&nbsp;Xiaozhen Huang","doi":"10.1016/j.ngib.2023.11.003","DOIUrl":"10.1016/j.ngib.2023.11.003","url":null,"abstract":"&lt;div&gt;&lt;p&gt;Normal-pressure shale gas is an important object of shale gas reserves and production increase with broad resource prospects in China, but its large-scale benefit development is still confronted with technical bottlenecks. To promote the large-scale benefit development of normal-pressure shale gas, this paper systematically sorts out and summarizes the research achievements and technological progresses related to normal-pressure shale gas from the aspects of accumulation mechanism, enrichment theory, percolation mechanism, development technology, and low-cost engineering technology, and points out the difficulties and challenges to the benefit development of normal-pressure shale gas in the complex structure zones of southern China, by taking the shale gas in the Southeast Chongqing Area of the Sichuan Basin as the research object. In addition, the research direction of normal-pressure shale gas exploration and development is discussed in terms of sweet spot selection, development technology policy, low-cost drilling technology and high-efficiency fracturing technology. And the following research results are obtained. First, the accumulation mechanism of normal-pressure shale gas is clarified from the perspective of geological exploration theory; the hydrocarbon accumulation model of generation, expulsion, retention and accumulation is established; the enrichment theory of “three-factor controlling reservoir” is put forward; and the comprehensive sweetspot target evaluation system is formed. Second, as for development technology, the development technology policies of “multiple series of strata, variable well spacing, long horizontal section, small included angle, low elevation difference, strong stimulation and pressure difference controlling” are formulated. Third, as for drilling engineering, the optimal fast drilling and completion technology with “secondary structure + radical parameter + integrated guidance + unpressured leak-proof cementing” as the core is formed. Fourth, as for fracturing engineering, the low-cost and high-efficiency fracturing technology with “multi-cluster small-stage + limited-entry perforating + double temporary blocking + high-intensity sand injection + fully electric” as the core is formed. Fifth, normal-pressure shale gas is characterized by complex geological conditions, low pressure coefficient and gas content, poor resource endowment and so on, but its resource utilization still faces a series of challenges, such as uncertain productivity construction positions, low single-well productivity and ultimate recoverable reserve, high investment cost and poor economic benefit. In conclusion, the key research directions to realize the large-scale benefit development of low-grade normal-pressure shale gas are to deepen the research on the enrichment and high yield mechanism and sweet spot selection of normal-pressure shale gas, strengthen the research on the benefit development technology policy based on percola","PeriodicalId":37116,"journal":{"name":"Natural Gas Industry B","volume":"10 6","pages":"Pages 555-569"},"PeriodicalIF":3.3,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2352854023000761/pdfft?md5=c54c6ff8945ba5a0bc6cd439c996e3bc&pid=1-s2.0-S2352854023000761-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138613580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}