Geoenergy Science and Engineering最新文献

{"title":"Mechanism of microfracture propagation under mechanical–chemical coupling conditions considering dissolution","authors":"Yan Zhuang ,&nbsp;Tiantian Zhang ,&nbsp;Xiangjun Liu ,&nbsp;Shifeng Zhang ,&nbsp;Lixi Liang ,&nbsp;Jian Xiong ,&nbsp;Xiaojian Zhang","doi":"10.1016/j.geoen.2024.213544","DOIUrl":"10.1016/j.geoen.2024.213544","url":null,"abstract":"<div><div>Microfracture propagation is well known to significantly impact the stability of well bores in shale formations; however, there is a lack of research on the role of dissolution. Herein, a shale microfracture propagation model is constructed that couples mechanics and chemistry by considering hydration, capillary, strength weakening, and dissolution effects. Combining relevant experiments with the model reveals the mechanism of microfracture propagation. Results indicate that ΔK(stress intensity factor) shows an upward trend with increasing hydration micromechanical forces and when hydration time exceeds 30 h, the rate of increase in ΔK gradually slows down. ΔK increases linearly with tensile strength. When the yield zone length “a” remains constant, ΔK first decreases and then increases with increasing a/b ratio, reaching its minimum value when the a/b ratio is 0.6. ΔK shows a linear increase with interfacial tension and decreases with increasing wetting angle and initiation angle of cracking. The dissolution of carbonate minerals can considerably influence the propagation of microcracks. Initially, the impact of this dissolution may not be pronounced; however, as the duration of the rock samples' exposure to the dissolution process exceeds 100 h, the increase in the stress intensity factor becomes substantial. The increase in ΔK accelerates the propagation of microcracks within rocks. Constructing a shale microfracture propagation model based on dissolution effects is crucial for elucidating the microscopic mechanisms of mechanical–chemical coupled changes in shale microfractures, which is significant for analyzing wellbore stability.</div></div>","PeriodicalId":100578,"journal":{"name":"Geoenergy Science and Engineering","volume":"245 ","pages":"Article 213544"},"PeriodicalIF":0.0,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical study of using dual sources constructed via deconvolution to suppress the collar waves in acoustic logging while drilling","authors":"Zhen Li ,&nbsp;Junjun Guo ,&nbsp;Jiayi Zhong ,&nbsp;Chuang Hei ,&nbsp;Xingjian Wang ,&nbsp;Can Jiang","doi":"10.1016/j.geoen.2024.213549","DOIUrl":"10.1016/j.geoen.2024.213549","url":null,"abstract":"<div><div>In the design of acoustic logging while drilling (LWD) instruments, acoustic isolation is crucial to prevent the loss of formation signals due to collar waves. A conventional approach involves carving periodic grooves on the drill collar to isolate collar waves, but this can compromise the mechanical integrity of the collar. In this paper, we introduce a novel method using dual sources to suppress collar waves generated by a monopole source. This method added a new near-source to the original acoustic LWD instrument, and its input signal is constructed via deconvolution. The effectiveness of this method is first verified using the finite-difference time domain (FDTD) in an infinite fluid medium. The amplitude ratio of the collar wave’s average frequency spectrum (0–20 kHz), excited by the deconvolution-type dual sources (DCDS), compared to a single far-source, is only 1.57%, effectively suppressing most of the collar waves. Since formations do not significantly affect the propagation characteristics of collar waves, this method remains effective in various formations, as corroborated by simulation results. Additionally, we applied the wave interference-based slowness-time-coherence (STC) method to successfully extract the formation P-wave velocity even when collar wave velocity and formation P-wave velocity are similar. This method provides an effective approach to suppress monopole collar waves without compromising the collar’s integrity and mechanical strength.</div></div>","PeriodicalId":100578,"journal":{"name":"Geoenergy Science and Engineering","volume":"246 ","pages":"Article 213549"},"PeriodicalIF":0.0,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142748038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Carbon steel pipeline CO2 erosion-corrosion damage prediction model and numerical simulation research","authors":"Yuxuan Huang ,&nbsp;Xiaochuan Wang ,&nbsp;Kunpeng Lu ,&nbsp;Jincheng Hu","doi":"10.1016/j.geoen.2024.213558","DOIUrl":"10.1016/j.geoen.2024.213558","url":null,"abstract":"<div><div>CO₂ erosion-corrosion (E-C) represents a significant and pervasive threat to the integrity of carbon steel pipeline in the oil and gas industry, which has attracted more and more attention. On this basis, a CO₂ E-C damage prediction model considering the synergistic effect is established combining with multiphase flow model, corrosion model and CO₂ corrosion model, in which the Eulerian-Lagrangian discrete particle method is employed in the multiphase flow model and the CO₂ corrosion model is modified and verified by the erosion-corrosion test method. By using the CFD-DPM technology, the three-dimensional numerical simulation of the elbow is carried out to demonstrate the characteristics of the prediction model, and the dominant factors and extent of CO₂ E-C damage can be determined based on the numerical simulation results. Both erosion and corrosion are non-negligible parts that lead to CO₂ E-C damage, with corrosion factors being the more important factor to be considered. The prediction results can not only provide suggestions for improving the design of carbon steel pipelines in the oil and gas industry, but also provide protective measures for the operation of existing pipelines to extend their service life, which is helpful for the development and implementation of plans in the oil and gas industry.</div></div>","PeriodicalId":100578,"journal":{"name":"Geoenergy Science and Engineering","volume":"246 ","pages":"Article 213558"},"PeriodicalIF":0.0,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142747965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Propped fracture conductivity in shale oil reservoirs: Prediction model and influencing factors","authors":"Liang Zhang ,&nbsp;Chuan He ,&nbsp;Lixing Li ,&nbsp;Ronghua Wen ,&nbsp;Yuzhu Liang","doi":"10.1016/j.geoen.2024.213537","DOIUrl":"10.1016/j.geoen.2024.213537","url":null,"abstract":"<div><div>Hydraulic fracturing is the main measure for stimulation of shale oil reservoirs, but the high content of clay minerals, well-developed bedding, and low mechanical strength of shale rock often result in a strong stress sensitivity of propped fractures associated with shale hydration expansion and proppant embedment in fracture wall. Especially under conditions of low sand laying concentration, the fracture conductivity can be greatly reduced. In this paper, a comprehensive prediction model of propped fracture conductivity in shale oil reservoirs was established, which considers the damage mechanisms of proppant compression, embedment, crushing, and shale hydration and expansion. The sensitivity analysis of factors affecting the fracture conductivity indicates that the proppant particle size, involved damage mechanisms, Kozeny-Carman coefficient, proppant layer number, and proppant density are the main factors to determine the fracture width and permeability and further affect the fracture conductivity. Most of the rest factors are related to the specific fracture damage mechanisms. The influence of shale hydration expansion is larger than that of proppant particle compression which is further larger than that of proppant crushing. In a real hydraulic fracture, the fracture width decreases from fracture heel to toe, caused by the non-uniform laying concentration of proppant. For the fracture near the wellbore usually with a large sand laying concentration, the influences of different factors are ranked as follows: proppant particle size &gt; elastic modulus of proppant &gt; fluid pressure &gt; hydration expansion coefficient &gt; filtration depth. For the front of the fracture with a low sand laying concentration, it is easy to close, which is sensitive to all the above factors. To achieve a high and stable fracture conductivity, the anti-swelling agent should be used to prevent shale hydration expansion. Large-size proppants with high elastic modulus should be selected to prop up the front of the fracture, and the decline of bottom-hole flow pressure should be controlled during the depressurized production process. The obtained results have a certain guiding significance for understanding the factors of shale fracture conductivity and the optimization of fracture parameters.</div></div>","PeriodicalId":100578,"journal":{"name":"Geoenergy Science and Engineering","volume":"246 ","pages":"Article 213537"},"PeriodicalIF":0.0,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142747966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Missing data interpolation in well logs based on generative adversarial network and improved krill herd algorithm","authors":"Fengtao Qu ,&nbsp;Yuqiang Xu ,&nbsp;Hualin Liao ,&nbsp;Jiansheng Liu ,&nbsp;Yanfeng Geng ,&nbsp;Lei Han","doi":"10.1016/j.geoen.2024.213538","DOIUrl":"10.1016/j.geoen.2024.213538","url":null,"abstract":"<div><div>Accurate logging data is crucial in geology and petroleum engineering for tasks such as geological modelling, reservoir simulation, and decision-making regarding well repair, water injection, and oil recovery. However, logging instrument failure occurs due to complex conditions such as high temperature and pressure, resulting in incomplete data and posing challenges for reservoir evaluation and development. The existing interpolation methods are primarily based on statistical and machine learning methods, lacking deep mining of hidden associations between logging items. Aiming at the problem of incomplete well-logging data, an incomplete well-logging data interpolation method based on a generative adversarial network and an improved krill herd algorithm is proposed. The results show that the proposed method has stable interpolation for well-logging data missing with different missing rates and any missing positions. Compared with other GANs (GAN, WGAN, and WGAN-GP), the RMSE of the proposed method is reduced by 57.63%, and the <span><math><mrow><msup><mi>R</mi><mn>2</mn></msup></mrow></math></span> is increased by 7.94%. The proposed method is compared with statistical methods (averaging and cubic spline interpolation) and machine learning methods (k-nearest neighbor, support vector machine, and random forest). The experimental results show that the proposed model has stable reconstruction performance for logging data with different missing rates and any missing positions.</div></div>","PeriodicalId":100578,"journal":{"name":"Geoenergy Science and Engineering","volume":"246 ","pages":"Article 213538"},"PeriodicalIF":0.0,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142757626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical investigation on heat extraction performance of supercritical CO2 in depleted oil and gas reservoirs","authors":"Zhipeng Xu ,&nbsp;Qi Jia ,&nbsp;Jiayi Li ,&nbsp;Tiantian Zhang ,&nbsp;Dongliang Han ,&nbsp;Yufei Tan ,&nbsp;Bo Feng","doi":"10.1016/j.geoen.2024.213557","DOIUrl":"10.1016/j.geoen.2024.213557","url":null,"abstract":"<div><div>Using supercritical CO₂ (sCO₂) for geothermal exploitation not only improves the heat extraction rate and saves injection-production energy consumption, but also gains environmental benefit of carbon sequestration. Compared to hot dry rock, depleted oil and gas reservoirs are nature porous reservoirs harboring abundant geothermal resources, in which artificial reservoir fracturing is unnecessary prior to the geothermal extraction. Besides, a lot of pre-existing oil-gas well networks along with ground facilities can be reutilized, significantly reducing geothermal drilling costs. This paper conducts a numerical investigation on using sCO₂ for heat extraction in depleted oil and gas reservoirs. Firstly, A coupled wellbore-reservoir model is established to analyze the flow and heat transfer characteristics of sCO₂ in the reservoir and injection-production well. Secondly, the variation of sCO₂ gas saturation, production temperature, production rate and heat extraction rate are studied. Finally, the influence of different factors on sCO₂ heat extraction performance is examined. The results indicate that the maximum sCO₂ heat extraction rate is 18.45 MW, and the temperature rise of sCO₂ within the reservoir is still higher than 24 °C after 30 years. To enhance sCO₂ heat extraction performance, reducing injection temperature, increasing production pressure and well spacing are advisable. In the case of multi-well scheme, a higher ratio of production wells to injection wells and a decentralized arrangement pattern are encouraged. The findings of this paper are anticipated to provide theoretical basis and technical support for efficient geothermal harvest in depleted oil and gas reservoirs and potential appropriate option in building heating.</div></div>","PeriodicalId":100578,"journal":{"name":"Geoenergy Science and Engineering","volume":"245 ","pages":"Article 213557"},"PeriodicalIF":0.0,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comprehensive analysis of gas slippage and Non-Darcy flow in carbonate rock samples under stress conditions","authors":"Milad Farahani ,&nbsp;Hamed Aghaei ,&nbsp;Yazdan Faraji","doi":"10.1016/j.geoen.2024.213547","DOIUrl":"10.1016/j.geoen.2024.213547","url":null,"abstract":"<div><div>This study examines the influence of stress on gas slippage and non-Darcy flow behavior in carbonate porous media, using core samples from two large carbonate reservoirs in the Middle East. Permeability measurements under varying stress conditions revealed significant increases in both the gas slippage factor and the non-Darcy coefficient with rising stress, indicating a related decrease in permeability. A new mathematical model, incorporating effective tortuosity and slippage radius into the Kozeny-Carman equation, was developed to accurately describe the stress-dependent nature of gas flow. Analysis of key pore attributes—such as porosity, pore size, shape, and tortuosity—underscored the critical role of pore structure, especially pore size and connectivity, in governing fluid flow under stress. These findings highlight the need to account for stress effects in reservoir engineering for improved modeling and management of carbonate reservoirs.</div></div>","PeriodicalId":100578,"journal":{"name":"Geoenergy Science and Engineering","volume":"246 ","pages":"Article 213547"},"PeriodicalIF":0.0,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142748037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A new division of late Cretaceous Erlian Basin tectonic units based on differential basement characteristics","authors":"Sheng Fu ,&nbsp;Zhen Liu ,&nbsp;Lijun Song ,&nbsp;Jiawang Ge ,&nbsp;Ning Tian ,&nbsp;Kewei Yin ,&nbsp;Xin Wang","doi":"10.1016/j.geoen.2024.213536","DOIUrl":"10.1016/j.geoen.2024.213536","url":null,"abstract":"<div><div>The Erlian Basin, a significant continental sedimentary basin in northeastern China, is renowned for its abundant hydrocarbon resources. Extensive research has been conducted on its sedimentary sequences, hydrocarbon accumulation, and geodynamic background. However, previous tectonic units classifications of the Erlian Basin predominantly reflect its post-Cenozoic tectonic framework, neglecting the Early Cretaceous period. This oversight fails to explain recent petroleum discoveries in the Wulanhua area of the Ondor Sum Uplift. In this study, geological, well log, seismic, gravity, and magnetic data, along with large, deep fault distributions and the regional geology of the Erlian Basin, were utilized to analyze its basement characteristics and propose a new tectonic division. Our findings reveal that the Erlian Basin's basement exhibits composite characteristics, resulting in a north-south zonation of basin depressions. Consequently, the basin's tectonic units were divided into northern, central, and southern depressions, delineated by two major deep faults: Xilinhot and Chifeng–Kaiyuan. This revised tectonic division clarifies the Early Cretaceous tectonic framework, enhances the basin's hydrocarbon exploration potential, and will guide future exploration efforts. Our study identifies nine favorable sags within the Erlian Basin with significant hydrocarbon potential.</div></div>","PeriodicalId":100578,"journal":{"name":"Geoenergy Science and Engineering","volume":"245 ","pages":"Article 213536"},"PeriodicalIF":0.0,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Creep mechanical behavior and damage characteristics of laminated slate under thermal-mechanical coupling","authors":"Haopeng Jiang,&nbsp;Annan Jiang","doi":"10.1016/j.geoen.2024.213535","DOIUrl":"10.1016/j.geoen.2024.213535","url":null,"abstract":"<div><div>To study the long-term stability of geothermal tunnels within a laminated rock mass, creep tests were conducted on slate with different bedding angles under different temperatures. In this study, we investigated the creep rate and macroscopic failure characteristics of slate with various bedding angles (0–90°). The coupled damage was considered, and combining with the unsteady fractional order theory, a constitutive model that can describe nonlinear behavior of laminated slate under thermal loading was established. The results show that gradual increases in temperature from 20 to 150 °C and loading from 10 to 115 MPa lead to increased rock damage, which leads to accelerated creep and eventual failure of the rock. The long-term strengths of slate with a bedding angle of 0 °C at temperatures of 20, 50, 80, 110, and 150 °C were found to be 126.21, 118.25, 106.18, 94.58, and 85.14 MPa, respectively, and its mechanical properties exhibited anisotropy. The proposed creep model effectively captures the three-stage creep characteristics of high-temperature layered rocks. The results of this study provide theoretical guidance for the long-term stability assessment of geothermal drilling in surrounding rock.</div></div>","PeriodicalId":100578,"journal":{"name":"Geoenergy Science and Engineering","volume":"245 ","pages":"Article 213535"},"PeriodicalIF":0.0,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Binary composite depolymerization system targeting polymer injection wells: A fusion of experiment and mechanism","authors":"Xiang Chen ,&nbsp;Kexin Liu ,&nbsp;Pingli Liu ,&nbsp;Yangyang Fu ,&nbsp;Juan Du ,&nbsp;Chengjie Wang ,&nbsp;Jinming Liu","doi":"10.1016/j.geoen.2024.213552","DOIUrl":"10.1016/j.geoen.2024.213552","url":null,"abstract":"<div><div>With the continuous development and application of polymer flooding technology, the problem of polymer injection well blockage has become increasingly severe, and various plugging removal technologies have emerged. This paper studies the depolymerization agent system, aiming at the blockage problem caused by the injection of polymer HLCHEM-P01 in the mine. The depolymerization agent system is evaluated through gel chromatography analysis, corrosion evaluation, pH sensitivity evaluation, and core displacement experiment. Finally, an efficient, safe, low corrosion and reliable binary compound depolymerization agent system was obtained. It can almost wholly degrade the polymer solution after 90 min. Analyze the mechanism of action of the binary compound depolymerization agent system, which involves specific antagonistic or synergistic interactions. The overall oxidation performance of mixed chemical agents is not just a simple superposition of the oxidation performance of individual chemical agents. The application effect of the depolymerization agent system is significant, and the core permeability recovery reaches over 90%. Effectively solving blockage problems can help improve oilfield efficiency and increase crude oil recovery.</div></div>","PeriodicalId":100578,"journal":{"name":"Geoenergy Science and Engineering","volume":"246 ","pages":"Article 213552"},"PeriodicalIF":0.0,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142747964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}